BinAstPhotSurvey - Web Tool

Photometric Survey for Asynchronous Binary Asteroids - Web Tool

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Finished asteroids shown:
All | recent only (< 1 month old)

Current date / time [UTC]: 2024-05-21 10:23:51

Worked asteroids (ordered by designation):
(347) Pariana - suspect, confirmation needed
(1195) Orangia
(1785) Wurm - Returning prome suspect
(1857) Parchomenko - binary candidate, more data needed
(2029) Binomi
(2411) Zellner - binary candidate, more data needed
(2827) Vellamo - Prime Suspect
(2923) Schuyler
(3042) Zelinsky
(3574) Rudaux
(4272) Entsuji - Return Binary, 2nd apparition
(5744) Yorimasa - binary suspect, more data needed
(5891) Gehrig
(6108) Glebov - binary suspect, more data needed
(6109) Balseiro - binary suspect, more data needed
(6896) 1987 RE1
(7144) Dossobuono - new binary, more data needed
(7343) Ockeghem - Returning paired asteroid
(8167) Ishii - binary or ternary candidate
(10548) 1992 PJ2 - Prime Suspect
(11548) Jerrylewis
(11723) 1998 HT125
(15254) 1990 QM4 - binary suspect, more data needed
(16233) 2000 FA12 - Returning prime suspect
(17251) Vondracek - new binary, more data needed
(19373) 1997 YC14
(20085) 1994 LC - new binary, more data needed
(29997) 2000 AE127
(32459) 2000 SK87
(55913) 1998 FL12 - Paired Asteroid
(88259) 2001 HJ7 - Paired Asteroid
(106848) 2000 YP16
(159476) 2000 RH79
2008 FU6 - NEA binary - to be closed after finishing reduction of PROMPT observations

(17251) Vondracek - new binary, more data needed		[Add new note] [Send data to: peter@asu.cas.cz ]
·	More data taken for this one by Vladimir Benishek, David Augustin, and Russ Durkee. The solution is unique now: https://www.asu.cas.cz/~asteroid/17251_2024a_porb.png https://www.asu.cas.cz/~asteroid/17251_2024a_p1.png https://www.asu.cas.cz/~asteroid/17251_2024b_porb.png https://www.asu.cas.cz/~asteroid/17251_2024b_p1.png https://www.asu.cas.cz/~asteroid/17251_2024c_porb.png https://www.asu.cas.cz/~asteroid/17251_2024c_p1.png More data (errors < 0.02 mag) would be good to take to improve the solution before we publish it on CBET. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2024- 5-12 19.27 0.247 2024- 5-13 11.68 0.247 2024- 5-14 4.10 0.247 2024- 5-14 20.51 0.247 2024- 5-15 12.93 0.247 2024- 5-16 5.34 0.247 2024- 5-16 21.76 0.247 2024- 5-17 14.17 0.247 2024- 5-18 6.59 0.247 2024- 5-18 23.00 0.247 2024- 5-27 3.98 0.247 2024- 5-27 20.40 0.247 2024- 5-28 12.81 0.247 2024- 5-29 5.23 0.247 2024- 5-29 21.64 0.247 2024- 5-30 14.06 0.247 2024- 5-31 6.47 0.247 2024- 5-31 22.89 0.247 2024- 6- 1 15.30 0.247 2024- 6- 2 7.72 0.247 2024- 6- 3 0.13 0.247 2024- 6- 3 16.55 0.247 2024- 6- 4 8.96 0.247 2024- 6- 5 1.38 0.247 2024- 6- 5 17.79 0.247 2024- 6- 6 10.21 0.247 2024- 6- 7 2.62 0.247 2024- 6- 7 19.04 0.247 2024- 6- 8 11.45 0.247 2024- 6- 9 3.87 0.247 2024- 6- 9 20.28 0.247 2024- 6-10 12.70 0.247 2024- 6-11 5.11 0.247 2024- 6-11 21.53 0.247 2024- 6-12 13.94 0.247 2024- 6-13 6.36 0.247 2024- 6-13 22.77 0.247 2024- 6-14 15.19 0.247 Date/Time UTC (LTc.) Phase -------------------------- 2024- 5-12 11.09 0.749 2024- 5-13 3.50 0.749 2024- 5-13 19.92 0.749 2024- 5-14 12.33 0.749 2024- 5-15 4.75 0.749 2024- 5-15 21.16 0.749 2024- 5-16 13.58 0.749 2024- 5-17 5.99 0.749 2024- 5-17 22.41 0.749 2024- 5-18 14.82 0.749 2024- 5-26 19.80 0.749 2024- 5-27 12.22 0.749 2024- 5-28 4.63 0.749 2024- 5-28 21.05 0.749 2024- 5-29 13.46 0.749 2024- 5-30 5.88 0.749 2024- 5-30 22.29 0.749 2024- 5-31 14.71 0.749 2024- 6- 1 7.12 0.749 2024- 6- 1 23.54 0.749 2024- 6- 2 15.95 0.749 2024- 6- 3 8.37 0.749 2024- 6- 4 0.78 0.749 2024- 6- 4 17.20 0.749 2024- 6- 5 9.61 0.749 2024- 6- 6 2.03 0.749 2024- 6- 6 18.44 0.749 2024- 6- 7 10.86 0.749 2024- 6- 8 3.27 0.749 2024- 6- 8 19.69 0.749 2024- 6- 9 12.10 0.749 2024- 6-10 4.52 0.749 2024- 6-10 20.93 0.749 2024- 6-11 13.35 0.749 2024- 6-12 5.76 0.749 2024- 6-12 22.18 0.749 2024- 6-13 14.59 0.749 2024- 6-14 7.01 0.749 2024- 6-14 23.42 0.749 Clear Skies, Petr [2024-05-12 09:30, Ondrejov]

·	Vladimir Benishek has observed this new target from Sopot, found it to be a binary candidate. A tentative lc decomposition (may be wrong): https://www.asu.cas.cz/~asteroid/17251_2024a_p1.png https://www.asu.cas.cz/~asteroid/17251_2024a_porb.png More data (errors < 0.02 mag) are needed to establish it well. Clear Skies, Petr [2024-04-19 07:57, Ondrejov]

(2411) Zellner - binary candidate, more data needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative lc decomposition (may be wrong):
https://www.asu.cas.cz/~asteroid/02411_2024a_p1.png
https://www.asu.cas.cz/~asteroid/02411_2024a_porb.png

More data (errors <= 0.02 mag) are needed to establish it well.

Clear Skies, Petr [2024-05-08 07:34, Ondrejov] Message sent to BinAstPhotSurvey conference

(2411) Zellner - binary candidate, more data needed	[Add new note] [Send data to: peter@asu.cas.cz ]
·	Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative lc decomposition (may be wrong): https://www.asu.cas.cz/~asteroid/02411_2024a_p1.png https://www.asu.cas.cz/~asteroid/02411_2024a_porb.png More data (errors <= 0.02 mag) are needed to establish it well. Clear Skies, Petr [2024-05-08 07:34, Ondrejov]

(15254) 1990 QM4 - binary suspect, more data needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· Vladimir Benishek has observed this off-list target from Sopot on 3 partial nights, found it to be a binary suspect. A very tentative lc decomposition (may be entirely wrong):
https://www.asu.cas.cz/~asteroid/15254_2024a_p1.png
https://www.asu.cas.cz/~asteroid/15254_2024a_porb.png

More data (errors not greater than 0.02 mag) are needed to confirm it.

Clear Skies, Petr [2024-05-03 07:22, Ondrejov] Message sent to BinAstPhotSurvey conference

(15254) 1990 QM4 - binary suspect, more data needed	[Add new note] [Send data to: peter@asu.cas.cz ]
·	Vladimir Benishek has observed this off-list target from Sopot on 3 partial nights, found it to be a binary suspect. A very tentative lc decomposition (may be entirely wrong): https://www.asu.cas.cz/~asteroid/15254_2024a_p1.png https://www.asu.cas.cz/~asteroid/15254_2024a_porb.png More data (errors not greater than 0.02 mag) are needed to confirm it. Clear Skies, Petr [2024-05-03 07:22, Ondrejov]

(0000) Test (Finished) - Finished [Add new note]
· [2024-04-09 08:50, Ondrejov]

· Test, please ignore. [2024-04-09 08:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· XXXX [2019-12-04 15:06, Ondrejov]

· This is a test message only. Please ignore.

Petr [2019-12-04 10:05, Ondrejov]

· bbbb [2019-12-02 10:31, Ondrejov]

· aaaa [2019-12-02 09:54, Ondrejov]

· XXXXXX [2019-11-08 09:00, Ondrejov]

· Test - please ignore. [2019-11-04 10:19, Ondrejov]

(32459) 2000 SK87 [Add new note]
[Send data to: peter@asu.cas.cz ]
· Sent two nights to Petr on this one. Just started another night. [2024-04-08 01:56, Shed of Science] Message sent to BinAstPhotSurvey conference

(32459) 2000 SK87	[Add new note] [Send data to: peter@asu.cas.cz ]
·	Sent two nights to Petr on this one. Just started another night. [2024-04-08 01:56, Shed of Science]

(6974) Solti (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5376, copied below for your convenience.

Cheers, Petr

(6974) SOLTI
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during Feb. 1-Mar. 8 reveal that minor planet (6974) is a
binary system with an orbital period of 49.52 Â± 0.04 hr. The primary shows
a period of 2.55181 Â± 0.00007 hr and has a light-curve amplitude of 0.23
magnitude at solar phases 4-5 degrees. Mutual eclipse/occultation events that
are 0.08 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.28.

2024 March 28 (CBET 5376) Daniel W. E. Green [2024-03-28 13:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative lc decomposition (the solution is not unique):
https://www.asu.cas.cz/~asteroid/06974_2024a_p1.png
https://www.asu.cas.cz/~asteroid/06974_2024a_porb.png

More data (errors < 0.02 mag) are needed to establish it well.

Clear Skies, Petr [2024-02-06 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

(6974) Solti (Finished) - binary	[Add new note]
·	Our report on this one has appeared on CBET 5376, copied below for your convenience. Cheers, Petr (6974) SOLTI V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A., report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science South Observatory during Feb. 1-Mar. 8 reveal that minor planet (6974) is a binary system with an orbital period of 49.52 Â± 0.04 hr. The primary shows a period of 2.55181 Â± 0.00007 hr and has a light-curve amplitude of 0.23 magnitude at solar phases 4-5 degrees. Mutual eclipse/occultation events that are 0.08 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.28. 2024 March 28 (CBET 5376) Daniel W. E. Green [2024-03-28 13:55, Ondrejov]

·	Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative lc decomposition (the solution is not unique): https://www.asu.cas.cz/~asteroid/06974_2024a_p1.png https://www.asu.cas.cz/~asteroid/06974_2024a_porb.png More data (errors < 0.02 mag) are needed to establish it well. Clear Skies, Petr [2024-02-06 09:20, Ondrejov]

(1879) Broederstroom (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5373, copied below for your convenience.

Cheers, Petr

(1879) BROEDERSTROOM
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; A. Marchini and R. Papini, Dipartimento di Scienze Fisiche, Della
Terra e Dell'Ambiente, University of Siena; F. Pilcher, Organ Mesa
Observatory, Las Cruces, NM, USA; N. Ruocco, Osservatorio Astronomico Nastro
Verde, Sorento, Italy; and R. Durkee, Shed of Science South Observatory,
Pontotoc, TX, USA, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia, a 0.30-m telescope at the
Astronomical Observatory of the University of Siena, a 0.35-m telescope at
the Organ Mesa Observatory, a 0.35-m telescope at the Nastro Verde
Observatory, and a 0.50-m telescope at the Shed of Science South Observatory
during Jan. 22-Mar. 3 reveal that minor planet (1879) is a binary system with
an orbital period of 47.83 Â± 0.02 hr. The primary shows a period of
3.01543 Â± 0.00008 hr and has a light-curve amplitude of 0.16 magnitude at
solar phases 1-5 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.12 magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.34 Â± 0.02.

2024 March 26 (CBET 5373) Daniel W. E. Green [2024-03-27 07:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has taken more data for this one from Sopot. The orbit period is close to commensurability with Earth's rotation, there are as many as 4 possible values for P_orb, about 12, 16, 24 and 48 hours. Lc decomposition for the ~16-h one:
https://www.asu.cas.cz/~asteroid/01879_2024a_p1.png
https://www.asu.cas.cz/~asteroid/01879_2024a_porb.png

More data (errors < 0.02 mag) are needed to resolve it. Particularly useful should be data taken from outside Europe ....

Clear Skies, Petr [2024-02-02 09:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek took his first data for this off-list target from Sopot, found it to be a binary suspect. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/01879_2024a_p1.png
https://www.asu.cas.cz/~asteroid/01879_2024a_porb.png
(Note: The period in the 2nd plot above was set just for plotting purpose. There is no solution for P_orb yet, obviously.)

More data (errors not greater than 0.02 mag) are needed to confirm it.

Clear Skies, Petr [2024-01-22 11:23, Ondrejov] Message sent to BinAstPhotSurvey conference

(1879) Broederstroom (Finished) - binary	[Add new note]
·	Our report on this one has appeared on CBET 5373, copied below for your convenience. Cheers, Petr (1879) BROEDERSTROOM V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; A. Marchini and R. Papini, Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of Siena; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, USA; N. Ruocco, Osservatorio Astronomico Nastro Verde, Sorento, Italy; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX, USA, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.30-m telescope at the Astronomical Observatory of the University of Siena, a 0.35-m telescope at the Organ Mesa Observatory, a 0.35-m telescope at the Nastro Verde Observatory, and a 0.50-m telescope at the Shed of Science South Observatory during Jan. 22-Mar. 3 reveal that minor planet (1879) is a binary system with an orbital period of 47.83 Â± 0.02 hr. The primary shows a period of 3.01543 Â± 0.00008 hr and has a light-curve amplitude of 0.16 magnitude at solar phases 1-5 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.12 magnitude deep indicate a secondary-to-primary mean-diameter ratio of 0.34 Â± 0.02. 2024 March 26 (CBET 5373) Daniel W. E. Green [2024-03-27 07:17, Ondrejov]

·	Vladimir Benishek has taken more data for this one from Sopot. The orbit period is close to commensurability with Earth's rotation, there are as many as 4 possible values for P_orb, about 12, 16, 24 and 48 hours. Lc decomposition for the ~16-h one: https://www.asu.cas.cz/~asteroid/01879_2024a_p1.png https://www.asu.cas.cz/~asteroid/01879_2024a_porb.png More data (errors < 0.02 mag) are needed to resolve it. Particularly useful should be data taken from outside Europe .... Clear Skies, Petr [2024-02-02 09:33, Ondrejov]

·	Vladimir Benishek took his first data for this off-list target from Sopot, found it to be a binary suspect. A tentative lc decomposition: https://www.asu.cas.cz/~asteroid/01879_2024a_p1.png https://www.asu.cas.cz/~asteroid/01879_2024a_porb.png (Note: The period in the 2nd plot above was set just for plotting purpose. There is no solution for P_orb yet, obviously.) More data (errors not greater than 0.02 mag) are needed to confirm it. Clear Skies, Petr [2024-01-22 11:23, Ondrejov]

(2280) Kunikov (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5371, copied below for your convenience.

Cheers, Petr

(2280) KUNIKOV
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
and K. Hornoch, Ondrejov Observatory; M. Husarik, M. Pikler, D. Tomko, and M.
Kovacova, Skalnate Pleso Observatory; and R. Durkee, Shed of Science South
Observatory, Pontotoc, TX, U.S.A., report that photometric observations taken
with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope
at Ondrejov Observatory, a 0.61-m telescope at the Skalnate Pleso Observatory,
and a 0.50-m telescope at the Shed of Science South Observatory during 2023
Dec. 4-2024 Feb. 18 reveal that minor planet (2280) is a binary system with an
orbital period of 21.479 Â± 0.003 hr. Mutual eclipse/occultation events that
are 0.61- to 0.76-magnitude deep indicate a lower limit on the secondary-to-
primary mean-diameter ratio of 0.87. Rotations of the components appear to be
synchronous with the orbital motion and an amplitude of the combined primary-
plus-secondary rotational lightcurve is 0.45 mag at solar phases 2-22 deg.

2024 March 21 (CBET 5371) Daniel W. E. Green [2024-03-22 07:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this new fully synchronous binary by Vladimir Benishek from Sopot and by Marek Husarik and coll. from Skalnate Pleso:
https://www.asu.cas.cz/~asteroid/02280.png

More good data (errors not greater than 0.03 mag) are needed to establish it well. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2024- 1-29 4.70 0.260
2024- 1-30 2.19 0.260
2024- 1-30 23.67 0.260
2024- 1-31 21.15 0.260
2024- 2- 1 18.63 0.260
2024- 2- 2 16.11 0.260
2024- 2- 3 13.60 0.260
2024- 2- 4 11.08 0.260
2024- 2- 5 8.56 0.260
2024- 2- 6 6.04 0.260
2024- 2- 7 3.52 0.260
2024- 2- 8 1.01 0.260
2024- 2- 8 22.49 0.260
2024- 2- 9 19.97 0.260
2024- 2-10 17.45 0.260
2024- 2-11 14.93 0.260
2024- 2-12 12.42 0.260
2024- 2-13 9.90 0.260
2024- 2-14 7.38 0.260
2024- 2-15 4.86 0.260
2024- 2-16 2.34 0.260
2024- 2-16 23.83 0.260
2024- 2-17 21.31 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2024- 1-29 15.23 0.750
2024- 1-30 12.71 0.750
2024- 1-31 10.19 0.750
2024- 2- 1 7.67 0.750
2024- 2- 2 5.15 0.750
2024- 2- 3 2.64 0.750
2024- 2- 4 0.12 0.750
2024- 2- 4 21.60 0.750
2024- 2- 5 19.08 0.750
2024- 2- 6 16.56 0.750
2024- 2- 7 14.05 0.750
2024- 2- 8 11.53 0.750
2024- 2- 9 9.01 0.750
2024- 2-10 6.49 0.750
2024- 2-11 3.97 0.750
2024- 2-12 1.46 0.750
2024- 2-12 22.94 0.750
2024- 2-13 20.42 0.750
2024- 2-14 17.90 0.750
2024- 2-15 15.38 0.750
2024- 2-16 12.87 0.750
2024- 2-17 10.35 0.750

Clear Skies, Petr [2024-01-22 13:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a fully synchronous binary candidate:
https://www.asu.cas.cz/~asteroid/02280.png

More data (errors < 0.03 mag) are needed to establish it well. A tentative event ephemeris (but don't limit your observations too narrowly around the predicted mid-event times, as the period is not very accurate yet and we also need to cover other phases to describe the lightcurve branches):

Date/Time UTC (LTc.) Phase
--------------------------
2023-12-20 19.50 0.250
2023-12-21 17.00 0.250
2023-12-22 14.50 0.250
2023-12-23 12.00 0.250
2023-12-30 16.00 0.250
2023-12-31 13.50 0.250
2024- 1- 1 11.00 0.250
2024- 1- 2 8.50 0.250
2024- 1- 3 6.00 0.250
2024- 1- 4 3.50 0.250
2024- 1- 5 1.00 0.250
2024- 1- 5 22.50 0.250
2024- 1- 6 20.00 0.250
2024- 1- 7 17.50 0.250
2024- 1- 8 15.00 0.250
2024- 1- 9 12.50 0.250
2024- 1-10 10.00 0.250
2024- 1-11 7.50 0.250
2024- 1-12 5.00 0.250
2024- 1-13 2.50 0.250
2024- 1-14 0.00 0.250
2024- 1-14 21.50 0.250
2024- 1-15 19.00 0.250
2024- 1-16 16.50 0.250
2024- 1-17 14.00 0.250
2024- 1-18 11.50 0.250
2024- 1-19 9.00 0.250
2024- 1-20 6.50 0.250
2024- 1-21 4.00 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2023-12-21 6.24 0.750
2023-12-22 3.74 0.750
2023-12-23 1.24 0.750
2023-12-23 22.74 0.750
2023-12-30 5.24 0.750
2023-12-31 2.74 0.750
2024- 1- 1 0.24 0.750
2024- 1- 1 21.74 0.750
2024- 1- 2 19.24 0.750
2024- 1- 3 16.74 0.750
2024- 1- 4 14.24 0.750
2024- 1- 5 11.74 0.750
2024- 1- 6 9.24 0.750
2024- 1- 7 6.74 0.750
2024- 1- 8 4.24 0.750
2024- 1- 9 1.74 0.750
2024- 1- 9 23.24 0.750
2024- 1-10 20.74 0.750
2024- 1-11 18.24 0.750
2024- 1-12 15.74 0.750
2024- 1-13 13.24 0.750
2024- 1-14 10.74 0.750
2024- 1-15 8.24 0.750
2024- 1-16 5.74 0.750
2024- 1-17 3.24 0.750
2024- 1-18 0.74 0.750
2024- 1-18 22.24 0.750
2024- 1-19 19.74 0.750
2024- 1-20 17.24 0.750
2024- 1-21 14.74 0.750

Clear Skies, Petr [2023-12-20 09:05, Ondrejov] Message sent to BinAstPhotSurvey conference

(2280) Kunikov (Finished) - binary	[Add new note]
·	Our report on this one has appeared on CBET 5371, copied below for your convenience. Cheers, Petr (2280) KUNIKOV V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova, and K. Hornoch, Ondrejov Observatory; M. Husarik, M. Pikler, D. Tomko, and M. Kovacova, Skalnate Pleso Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A., report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope at Ondrejov Observatory, a 0.61-m telescope at the Skalnate Pleso Observatory, and a 0.50-m telescope at the Shed of Science South Observatory during 2023 Dec. 4-2024 Feb. 18 reveal that minor planet (2280) is a binary system with an orbital period of 21.479 Â± 0.003 hr. Mutual eclipse/occultation events that are 0.61- to 0.76-magnitude deep indicate a lower limit on the secondary-to- primary mean-diameter ratio of 0.87. Rotations of the components appear to be synchronous with the orbital motion and an amplitude of the combined primary- plus-secondary rotational lightcurve is 0.45 mag at solar phases 2-22 deg. 2024 March 21 (CBET 5371) Daniel W. E. Green [2024-03-22 07:31, Ondrejov]

·	More data taken for this new fully synchronous binary by Vladimir Benishek from Sopot and by Marek Husarik and coll. from Skalnate Pleso: https://www.asu.cas.cz/~asteroid/02280.png More good data (errors not greater than 0.03 mag) are needed to establish it well. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2024- 1-29 4.70 0.260 2024- 1-30 2.19 0.260 2024- 1-30 23.67 0.260 2024- 1-31 21.15 0.260 2024- 2- 1 18.63 0.260 2024- 2- 2 16.11 0.260 2024- 2- 3 13.60 0.260 2024- 2- 4 11.08 0.260 2024- 2- 5 8.56 0.260 2024- 2- 6 6.04 0.260 2024- 2- 7 3.52 0.260 2024- 2- 8 1.01 0.260 2024- 2- 8 22.49 0.260 2024- 2- 9 19.97 0.260 2024- 2-10 17.45 0.260 2024- 2-11 14.93 0.260 2024- 2-12 12.42 0.260 2024- 2-13 9.90 0.260 2024- 2-14 7.38 0.260 2024- 2-15 4.86 0.260 2024- 2-16 2.34 0.260 2024- 2-16 23.83 0.260 2024- 2-17 21.31 0.260 Date/Time UTC (LTc.) Phase -------------------------- 2024- 1-29 15.23 0.750 2024- 1-30 12.71 0.750 2024- 1-31 10.19 0.750 2024- 2- 1 7.67 0.750 2024- 2- 2 5.15 0.750 2024- 2- 3 2.64 0.750 2024- 2- 4 0.12 0.750 2024- 2- 4 21.60 0.750 2024- 2- 5 19.08 0.750 2024- 2- 6 16.56 0.750 2024- 2- 7 14.05 0.750 2024- 2- 8 11.53 0.750 2024- 2- 9 9.01 0.750 2024- 2-10 6.49 0.750 2024- 2-11 3.97 0.750 2024- 2-12 1.46 0.750 2024- 2-12 22.94 0.750 2024- 2-13 20.42 0.750 2024- 2-14 17.90 0.750 2024- 2-15 15.38 0.750 2024- 2-16 12.87 0.750 2024- 2-17 10.35 0.750 Clear Skies, Petr [2024-01-22 13:46, Ondrejov]

·	Vladimir Benishek has observed this off-list target from Sopot, found it to be a fully synchronous binary candidate: https://www.asu.cas.cz/~asteroid/02280.png More data (errors < 0.03 mag) are needed to establish it well. A tentative event ephemeris (but don't limit your observations too narrowly around the predicted mid-event times, as the period is not very accurate yet and we also need to cover other phases to describe the lightcurve branches): Date/Time UTC (LTc.) Phase -------------------------- 2023-12-20 19.50 0.250 2023-12-21 17.00 0.250 2023-12-22 14.50 0.250 2023-12-23 12.00 0.250 2023-12-30 16.00 0.250 2023-12-31 13.50 0.250 2024- 1- 1 11.00 0.250 2024- 1- 2 8.50 0.250 2024- 1- 3 6.00 0.250 2024- 1- 4 3.50 0.250 2024- 1- 5 1.00 0.250 2024- 1- 5 22.50 0.250 2024- 1- 6 20.00 0.250 2024- 1- 7 17.50 0.250 2024- 1- 8 15.00 0.250 2024- 1- 9 12.50 0.250 2024- 1-10 10.00 0.250 2024- 1-11 7.50 0.250 2024- 1-12 5.00 0.250 2024- 1-13 2.50 0.250 2024- 1-14 0.00 0.250 2024- 1-14 21.50 0.250 2024- 1-15 19.00 0.250 2024- 1-16 16.50 0.250 2024- 1-17 14.00 0.250 2024- 1-18 11.50 0.250 2024- 1-19 9.00 0.250 2024- 1-20 6.50 0.250 2024- 1-21 4.00 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2023-12-21 6.24 0.750 2023-12-22 3.74 0.750 2023-12-23 1.24 0.750 2023-12-23 22.74 0.750 2023-12-30 5.24 0.750 2023-12-31 2.74 0.750 2024- 1- 1 0.24 0.750 2024- 1- 1 21.74 0.750 2024- 1- 2 19.24 0.750 2024- 1- 3 16.74 0.750 2024- 1- 4 14.24 0.750 2024- 1- 5 11.74 0.750 2024- 1- 6 9.24 0.750 2024- 1- 7 6.74 0.750 2024- 1- 8 4.24 0.750 2024- 1- 9 1.74 0.750 2024- 1- 9 23.24 0.750 2024- 1-10 20.74 0.750 2024- 1-11 18.24 0.750 2024- 1-12 15.74 0.750 2024- 1-13 13.24 0.750 2024- 1-14 10.74 0.750 2024- 1-15 8.24 0.750 2024- 1-16 5.74 0.750 2024- 1-17 3.24 0.750 2024- 1-18 0.74 0.750 2024- 1-18 22.24 0.750 2024- 1-19 19.74 0.750 2024- 1-20 17.24 0.750 2024- 1-21 14.74 0.750 Clear Skies, Petr [2023-12-20 09:05, Ondrejov]

(6086) Vrchlicky (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5366, copied below for your convenience.

Cheers, Petr

(6086) VRCHLICKY
L. Franco, Balzaretto Observatory, Rome, Italy; P. Pravec, Ondrejov
Observatory; V. Benishek, Belgrade Astronomical Observatory; R. Durkee, Shed
of Science South Observatory, Pontotoc, TX, U.S.A.; L. Buzzi and M. Calabro,
Schiaparelli Observatory, Varese, Italy; G. Galli, GiaGa Observatory, Pogliano
Milanese, Italy; P. Bacci and M. Maestripieri, San Marcello Pistoiese
Observatory, San Marcello Pistoiese, Italy; N. Montigiani and M. Mannucci,
Osservatorio Astronomico Margherita Hack, Lastra a Signa, Italy; A. Marchini
and R. Papini, Astronomical Observatory University of Siena, Siena, Italy;
N. Ruocco, Osservatorio Astronomico Nastro Verde, Sorrento, Italy; M.
Tombelli, M. Iozzi, and M. Lombardo, Beppe Forti Astronomical Observatory,
Montelupo Fiorentino, Italy; G. Scarfi, Iota Scorpii Observatory, La Spezia,
Italy; and G. Baj, M57 Observatory, Saltrio, Italy, report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia,
a 0.50-m telescope at the Shed of Science South Observatory, a 0.84-m
telescope and 0.36-m at the Schiaparelli Observatory, a 0.36-m telescope at
the GiaGa Observatory, a 0.60-m telescope at the San Marcello Pistoiese
Observatory, a 0.36-m telescope at the Osservatorio Astronomico Margherita
Hack, a 0.30-m telescope at the Astronomical Observatory University of Siena,
a 0.35-m telescope at the Osservatorio Astronomico Nastro Verde, a 0.40-m
telescope at the Beppe Forti Observatory, a 0.40-m telescope at the Iota
Scorpii Observatory, and a 0.35-m telescope at the M57 Observatory during
2023 Nov. 17-2023 Dec. 18 reveal that minor planet (6086) is a binary system
with an orbital period of 22.61 Â± 0.01 hr. The primary shows a period of
2.7674 Â± 0.0001 hr and has a lightcurve amplitude of 0.07 mag at solar
phases 1-12 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/
occultation events that are 0.05 to 0.08 magnitude deep indicate a lower
limit on the secondary-to-primary mean-diameter ratio of 0.22.

2024 March 11 (CBET 5366) Daniel W. E. Green [2024-03-12 08:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will try to follow this tonight.

Russ [2023-12-03 01:10, Shed of Science] Message sent to observers

· Alessandro Marchini and Riccardo Papini have observed this off-list target from Siena on two nights, found it to be a binary suspect. A very tentative lc decomposition (may be wrong):
https://www.asu.cas.cz/~asteroid/06086_2023a_p1.png
https://www.asu.cas.cz/~asteroid/06086_2023a_porb.png
(Note: The period in the second plot above was set just for the plotting purpose. There is no real solution for P_orb yet.)

More data (errors < 0.015 mag) are needed to establish it well.

Clear Skies, Petr [2023-11-27 14:23, Ondrejov] Message sent to BinAstPhotSurvey conference

(6086) Vrchlicky (Finished) - binary	[Add new note]
·	Our report on this one has appeared on CBET 5366, copied below for your convenience. Cheers, Petr (6086) VRCHLICKY L. Franco, Balzaretto Observatory, Rome, Italy; P. Pravec, Ondrejov Observatory; V. Benishek, Belgrade Astronomical Observatory; R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; L. Buzzi and M. Calabro, Schiaparelli Observatory, Varese, Italy; G. Galli, GiaGa Observatory, Pogliano Milanese, Italy; P. Bacci and M. Maestripieri, San Marcello Pistoiese Observatory, San Marcello Pistoiese, Italy; N. Montigiani and M. Mannucci, Osservatorio Astronomico Margherita Hack, Lastra a Signa, Italy; A. Marchini and R. Papini, Astronomical Observatory University of Siena, Siena, Italy; N. Ruocco, Osservatorio Astronomico Nastro Verde, Sorrento, Italy; M. Tombelli, M. Iozzi, and M. Lombardo, Beppe Forti Astronomical Observatory, Montelupo Fiorentino, Italy; G. Scarfi, Iota Scorpii Observatory, La Spezia, Italy; and G. Baj, M57 Observatory, Saltrio, Italy, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.50-m telescope at the Shed of Science South Observatory, a 0.84-m telescope and 0.36-m at the Schiaparelli Observatory, a 0.36-m telescope at the GiaGa Observatory, a 0.60-m telescope at the San Marcello Pistoiese Observatory, a 0.36-m telescope at the Osservatorio Astronomico Margherita Hack, a 0.30-m telescope at the Astronomical Observatory University of Siena, a 0.35-m telescope at the Osservatorio Astronomico Nastro Verde, a 0.40-m telescope at the Beppe Forti Observatory, a 0.40-m telescope at the Iota Scorpii Observatory, and a 0.35-m telescope at the M57 Observatory during 2023 Nov. 17-2023 Dec. 18 reveal that minor planet (6086) is a binary system with an orbital period of 22.61 Â± 0.01 hr. The primary shows a period of 2.7674 Â± 0.0001 hr and has a lightcurve amplitude of 0.07 mag at solar phases 1-12 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/ occultation events that are 0.05 to 0.08 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.22. 2024 March 11 (CBET 5366) Daniel W. E. Green [2024-03-12 08:19, Ondrejov]

·	I will try to follow this tonight. Russ [2023-12-03 01:10, Shed of Science]

·	Alessandro Marchini and Riccardo Papini have observed this off-list target from Siena on two nights, found it to be a binary suspect. A very tentative lc decomposition (may be wrong): https://www.asu.cas.cz/~asteroid/06086_2023a_p1.png https://www.asu.cas.cz/~asteroid/06086_2023a_porb.png (Note: The period in the second plot above was set just for the plotting purpose. There is no real solution for P_orb yet.) More data (errors < 0.015 mag) are needed to establish it well. Clear Skies, Petr [2023-11-27 14:23, Ondrejov]

(20325) Julianoey (Finished) - binary [Add new note]
· This one is closed for that apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2024-03-01 13:14, Ondrejov]

· Julian Oey has observed "his" binary asteroid from Leura recently :) Lc decomposition:
http://www.asu.cas.cz/~asteroid/20325_2021a_porb.png
http://www.asu.cas.cz/~asteroid/20325_2021a_p1.png

More data (error < 0.03 mag) would be useful for future modeling of the binary. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-11- 6 5.47 0.256
2021-11- 7 5.01 0.256
2021-11- 8 4.55 0.256
2021-11- 9 4.08 0.256
2021-11-10 3.62 0.256
2021-11-11 3.16 0.256
2021-11-12 2.70 0.256
2021-11-22 21.60 0.256
2021-11-23 21.14 0.256
2021-11-24 20.68 0.256
2021-11-25 20.21 0.256
2021-11-26 19.75 0.256
2021-11-27 19.29 0.256
2021-11-28 18.82 0.256
2021-11-29 18.36 0.256
2021-11-30 17.90 0.256
2021-12- 1 17.44 0.256
2021-12- 2 16.97 0.256
2021-12- 3 16.51 0.256
2021-12- 4 16.05 0.256
2021-12- 5 15.58 0.256
2021-12- 6 15.12 0.256
2021-12- 7 14.66 0.256
2021-12- 8 14.19 0.256
2021-12- 9 13.73 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2021-11- 5 17.69 0.756
2021-11- 6 17.23 0.756
2021-11- 7 16.77 0.756
2021-11- 8 16.30 0.756
2021-11- 9 15.84 0.756
2021-11-10 15.38 0.756
2021-11-11 14.92 0.756
2021-11-12 14.45 0.756
2021-11-23 9.36 0.756
2021-11-24 8.90 0.756
2021-11-25 8.43 0.756
2021-11-26 7.97 0.756
2021-11-27 7.51 0.756
2021-11-28 7.04 0.756
2021-11-29 6.58 0.756
2021-11-30 6.12 0.756
2021-12- 1 5.66 0.756
2021-12- 2 5.19 0.756
2021-12- 3 4.73 0.756
2021-12- 4 4.27 0.756
2021-12- 5 3.80 0.756
2021-12- 6 3.34 0.756
2021-12- 7 2.88 0.756
2021-12- 8 2.41 0.756
2021-12- 9 1.95 0.756

Clear Skies, Petr [2021-11-05 11:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· start to observe from 13:24 to 17:48 UT 10/01 [2021-10-01 23:36, Blue Mountains Obs]

· This binary has got insufficient data in this year to be decomposed accurately. Target closed for this apparition. Petr [2019-06-13 11:14, Ondrejov]

· observed on 01/01, 01/03, 01/12, 01/14, 01/15, 01/16 [2019-01-17 11:03, Blue Mountains Obs] Message sent to observers

· Started observing the return binary [2019-01-01 21:00, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Done in the 3rd apparition. Petr [2017-09-17 05:58, Ondrejov]

· Julian Oey has observed this binary Julianoey :-) on 8 nights in July:
http://www.asu.cas.cz/~asteroid/20325_2017a_porb.png
http://www.asu.cas.cz/~asteroid/20325_2017a_p1.png

More data (with errors <= 0.03 mag) would be useful for further refining its orbital model; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 9- 9 14.10 0.257
2017- 9-10 13.63 0.257
2017- 9-11 13.17 0.257
2017- 9-12 12.70 0.257
2017- 9-13 12.23 0.257
2017- 9-14 11.76 0.257
2017- 9-15 11.29 0.257
2017- 9-16 10.83 0.257
2017- 9-17 10.36 0.257
2017- 9-18 9.89 0.257
2017- 9-19 9.42 0.257
2017- 9-20 8.95 0.257
2017- 9-21 8.49 0.257
2017- 9-22 8.02 0.257
2017- 9-23 7.55 0.257
2017- 9-24 7.08 0.257
2017- 9-25 6.61 0.257
2017- 9-26 6.15 0.257
2017- 9-27 5.68 0.257
2017- 9-28 5.21 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2017- 9- 9 2.32 0.757
2017- 9-10 1.86 0.757
2017- 9-11 1.39 0.757
2017- 9-12 0.92 0.757
2017- 9-13 0.45 0.757
2017- 9-13 23.98 0.757
2017- 9-14 23.52 0.757
2017- 9-15 23.05 0.757
2017- 9-16 22.58 0.757
2017- 9-17 22.11 0.757
2017- 9-18 21.64 0.757
2017- 9-19 21.18 0.757
2017- 9-20 20.71 0.757
2017- 9-21 20.24 0.757
2017- 9-22 19.77 0.757
2017- 9-23 19.30 0.757
2017- 9-24 18.84 0.757
2017- 9-25 18.37 0.757
2017- 9-26 17.90 0.757
2017- 9-27 17.43 0.757
2017- 9-28 16.96 0.757

Clear Skies, Petr [2017-08-31 09:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Appropriately, I Started observing the return binary on July 15,19,20,21,22,23,24,26 [2017-08-05 12:54, Blue Mountains Obs]

(8306) Shoko (Finished) - 3-period system [Add new note]
· This 3-period system is closed for the 3rd apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2024-03-01 13:06, Ondrejov]

· Starting this return 3-period system tonight.
Don [2023-08-23 00:36, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Our discovery has been published in IAUC 9268, see the copy below.

Cheers, Petr

(8306) SHOKO
P. Pravec, P. Kusnirak, K. Hornoch, and A. Galad, Ondrejov
Observatory and European Southern Observatory, La Silla; Yu. N.
Krugly and V. Chiorny, Kharkiv Observatory; R. Inasaridze, O.
Kvaratskhelia, and V. Ayvazian, Abastumani Observatory; O.
Parmonov, Maidanak Observatory; J. Pollock, Appalachian State
University; S. Mottola, Calar Alto Observatory; J. Oey, Blue
Mountains Observatory, Leura, NSW; D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A.; J. Zizka and J. Vrastil,
Charles University, Prague; I. Molotov, Keldish Institute of
Applied Mathematics, Moscow; and D. E. Reichart, K. M. Ivarsen,
J. B. Haislip, and A. LaCluyze, Physics and Astronomy Department,
University of North Carolina at Chapel Hill, report that
photometric observations obtained during 2013 Sept. 7-Dec. 7 reveal
that minor planet (8306) is a binary system with an orbital period
of 36.20 ± 0.04 hr. The primary shows a period of 3.3503 ±
0.0002 hr, and it has a lightcurve amplitude of 0.11 mag at solar
phases 3-13 deg, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are up to 0.26 mag deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of
0.40. The secondary shows a period equal to the orbital period,
indicating synchronous rotation. Residuals of the fit show an
additional brightness variation that may be due to rotation of a
third body of the system. The mean absolute R magnitude of the
system is H_R = 14.83 ± 0.07, assuming G = 0.24 ± 0.11. These
observations were run as a part of their photometric project
"NEOSource" within its task to study binary and multiple systems
among minor-planet pairs [i.e., pairs of minor planets that are in
highly similar heliocentric orbits (see Vokrouhlicky and Nesvorny
2008, A.J. 136, 280; Pravec et al. 2010, Nature 466, 1085)]. Minor
planet (8306) was selected as a target when found that it appears
paired with minor planet 2011 SR_158 using the method of Pravec and
Vokrouhlicky (2009, Icarus 204, 580), modified with use of the mean
elements from AstDyS-2 (see website URL
http://hamilton.dm.unipi.it/astdys2/) and with backward
integrations of their orbits using the method of Vokrouhlicky
(2009, Ap.J. 706, L37). The integrations indicate that the pair
separated from a single body between 300 and 650 kyr ago.

2013 December 28 (9268) Daniel W. E. Green [2013-12-31 08:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:20 UT and will, clouds permitting, catch most of the 0.735 phase event.
Don [2013-11-08 00:22, Sugarloaf] Message sent to observers

· Started a run at 23:00, Nov 1 UT and hope to catch the 0.735 phase event.
Don [2013-11-01 23:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed for 6 hours tonight and covered 0.25-phase event. Peter K. [2013-10-30 23:23, Ondrejov] Message sent to observers

· Observed for 3 hours last night (with cadence of one "point" per hour). Peter K. [2013-10-29 09:15, Ondrejov]

· Event ephemeris updated with our 2013 Oct 25-28 observations with DK154:

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-29 7.29 0.235
2013-10-30 19.49 0.235
2013-11- 1 7.69 0.235
2013-11- 2 19.89 0.235
2013-11- 4 8.09 0.235
2013-11- 5 20.29 0.235
2013-11- 7 8.49 0.235
2013-11- 8 20.69 0.235
2013-11-10 8.89 0.235

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-30 1.41 0.735
2013-10-31 13.61 0.735
2013-11- 2 1.81 0.735
2013-11- 3 14.01 0.735
2013-11- 5 2.21 0.735
2013-11- 6 14.41 0.735
2013-11- 8 2.61 0.735
2013-11- 9 14.81 0.735

Clear Skies, Petr [2013-10-28 13:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Additional observations for this 3-period paired asteroid were taken by Peter Kusnirak and Kamil Hornoch with DK154 on La Silla (2 nights), O. Parmonov and Yura Krugly from Maidanak (2), Don Pray from Sugarloaf Mountain (2), Julian Oey from Leura (1), Vasilij Shevchenko from Kharkiv (1), and R. Inasaridze from Abastumani (1). Current solution:
http://www.asu.cas.cz/~asteroid/008306_porb.png
http://www.asu.cas.cz/~asteroid/008306_p1.png
http://www.asu.cas.cz/~asteroid/008306_p2.png

More observations for the events in particular would be useful. Errors < 0.03 mag are needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-23 6.15 0.253
2013-10-24 18.30 0.253
2013-10-26 6.45 0.253
2013-10-27 18.60 0.253
2013-10-29 6.75 0.253
2013-10-30 18.90 0.253
2013-11- 1 7.05 0.253
2013-11- 2 19.20 0.253
2013-11- 4 7.35 0.253
2013-11- 5 19.50 0.253
2013-11- 7 7.65 0.253
2013-11- 8 19.80 0.253
2013-11-10 7.95 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-22 11.92 0.749
2013-10-24 0.07 0.749
2013-10-25 12.22 0.749
2013-10-27 0.37 0.749
2013-10-28 12.52 0.749
2013-10-30 0.67 0.749
2013-10-31 12.82 0.749
2013-11- 2 0.97 0.749
2013-11- 3 13.12 0.749
2013-11- 5 1.27 0.749
2013-11- 6 13.42 0.749
2013-11- 8 1.57 0.749
2013-11- 9 13.72 0.749

Clear Skies, Petr [2013-10-15 06:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started tonight on 16UT at Abastumani. Regars, Yura [2013-10-09 17:22, Kharkiv] Message sent to observers

· Thanks to the great effort from a few stations, we are getting a solution now. And it is an interesting one.

Since my message on October 3, following observations were added: 5 nights by Peter Kusnirak, Kamil Hornoch and Jan Vrastil from here, 2+1 nights by Joe Pollock with Prompt+SSOPrompt, 1 night by Julian Oey from Leura, and 1 night by Vasilij Chiorny from Kharkiv. Three more events were captured. We have a unique solution for the orbital period: 36.15 h. The events are evolving rapidly, they deepen from night to night; we are apparently moving into the eclipse geometry fast. Monitoring the events during following days and weeks will be very useful.

This is the first case ever where I had to fit as many as THREE rotational lightcurve components (outside events). There is a period of 3.3503 h which apparently belongs to the primary. Then there is a rotational lightcurve component with period equal to the orbital period; it is apparently a lightcurve of the eclipsing, and synchronous, satellite. And, in addition, we have there present a third lightcurve component for which I'm getting a likely period (U = 2+) of 60.9 h. See following plots of the individual components:
http://www.asu.cas.cz/~asteroid/008306_porb.png
http://www.asu.cas.cz/~asteroid/008306_p1.png
http://www.asu.cas.cz/~asteroid/008306_p2.png
(Note that in the first plot, observations taken earlier in the lunation didn't show mutual events; we are moving into the eclipse geometry recently.) The 60.9-h lightcurve component may belong to a third body in the system, but we will need more data to establish interpretation. Ideally, we would like to get events also from the ternary. Well, there is a chance that its events will begin to occur as we are moving deeper into the eclipse geometry for the secondary, if the ternary's orbit is co-planar. We'll see.

More data for the events in particular are needed; events ephemeris is below. Outside events, only calibrated/linked data are going to be useful for this complex system; don't bother taking relative data at times substantially away from the events.

Date/Time UTC (LTc.) Phase
--------------------------
2013-10- 9 16.59 0.247
2013-10-11 4.74 0.247
2013-10-12 16.89 0.247
2013-10-14 5.04 0.247
2013-10-15 17.19 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-10 10.72 0.749
2013-10-11 22.87 0.749
2013-10-13 11.02 0.749
2013-10-14 23.17 0.749

Clear Skies, Petr [2013-10-09 13:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:50 UT, Oct 9. I should get 5.5 hours on it.
Don [2013-10-09 01:03, Sugarloaf]

· Observing from 18 UT tonight. Event captured. Peter K. [2013-10-09 00:10, Ondrejov] Message sent to observers

· Last Night Prompt Chile - Observed from 0236-0452 UT then 0519-0553 UT. Otherwise clouds. Hopefully got event at 0426.

Last Night Prompt Siding Spring - Continuous run from 0942-1653 UT under good conditions. Joe [2013-10-08 17:18, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt in Chile at 0235 UT. Hope to cover possible event at 0426 UT. Joe [2013-10-08 02:37, Dark Sky & PROMPT]

· Observing from 18:10 UT. Peter K. [2013-10-07 22:33, Ondrejov] Message sent to observers

· observed from 10 h to 16h 10/04. Clear weather. [2013-10-04 21:52, Blue Mountains Obs]

· Trying this one in unpredictable (now worsened) conditions. Best wishes, Kamil [2013-10-04 19:24, Ondrejov] Message sent to observers

· Began observations from Prompt Chile at 2345 UT. Hope to run until 0745 UT. Will then try to observe from Prompt Siding Spring from about 0900 UT to 1700 UT. Joe [2013-10-03 23:56, Dark Sky & PROMPT]

· Observing from 18:20 UT tonight. Peter K. [2013-10-03 19:26, Ondrejov] Message sent to observers

· Dear All,

We are working the primary of the asteroid pair 8306-2011SR158 since 2013-09-07. We took 8 calibrated nights from Ondrejov, Stefano Mottola took two relative nights from Calar Alto, R. Inasaridze and Yura Krugly took one relative night from Abastumani, and Vasilij Chiorny took one relative night from Kharkiv. The asteroid shows a short period of 3.35 h, as expected for the low size ratio of this pair (Delta H ~ 3.1) from the rotational fission formation theory (Pravec et al. 2010), but there is more than that. The paired asteroid is probably a binary system, like a few other systems we found within our NEOSource project with the Danish 1.54-m telescope at La Silla recently, see the talk I gave on the Binaries 3 meeting on Hawaii in June:
http://www.asu.cas.cz/~ppravec/Bin-3_abs_Pravec.pdf
http://www.asu.cas.cz/~ppravec/bin3.ppt
In 8306, there appears to be a second rotational lightcurve component with a likely period of 64.3 h (U = 2+), and there are also additional deviations, some of which may be mutual events in the system. Particularly suspicious are two sharp, short (~1.2 h ) attenuations that we observed on 09-29.9 and 10-02.9 (the x-ed points in the second plot below). See the primary and the probable secondary lightcurves:
http://www.asu.cas.cz/~asteroid/008306_p1.png
http://www.asu.cas.cz/~asteroid/008306_p2.png

We need to nail down P_2 and to establish P_orb (different from P_2). As they both are long, we need your help. We would highly appreciate if you could observe the asteroid during coming nights. Long sessions and photometric errors not greater than 0.02 mag are needed. Calibrations of your data in a consistent magnitude system would be quite useful if they are accurate to 0.02 mag.

Clear Skies,

Petr [2013-10-03 09:27, Ondrejov] Message sent to BinAstPhotSurvey conference

(7344) Summerfield (Finished) - binary [Add new note]
· This one is closed for the 3rd apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2024-03-01 13:01, Ondrejov]

· I did a session on this on Nov 20.
Don [2023-11-21 17:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done in 2nd apparition.

Petr [2021-07-19 10:29, Ondrejov]

· observed on 05/16 and 05/17 [2021-05-19 12:41, Blue Mountains Obs] Message sent to observers

· Starting an out of event run on this at 01:40 UT.
Don [2021-05-14 01:37, Sugarloaf]

· Don Pray took a good session covering event yesterday; current lc decomposition:
http://www.asu.cas.cz/~asteroid/07344_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07344_2021a_p1.png

More good data (errors < 0.02 mag) are needed. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5-13 14.91 0.255
2021- 5-14 8.32 0.255
2021- 5-15 1.74 0.255
2021- 5-15 19.16 0.255
2021- 5-16 12.57 0.255
2021- 5-17 5.99 0.255
2021- 5-17 23.40 0.255
2021- 5-18 16.82 0.255
2021- 5-19 10.24 0.255
2021- 5-20 3.65 0.255
2021- 5-20 21.07 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5-13 23.61 0.755
2021- 5-14 17.02 0.755
2021- 5-15 10.44 0.755
2021- 5-16 3.85 0.755
2021- 5-16 21.27 0.755
2021- 5-17 14.69 0.755
2021- 5-18 8.10 0.755
2021- 5-19 1.52 0.755
2021- 5-19 18.93 0.755
2021- 5-20 12.35 0.755

Clear Skies, Petr [2021-05-13 12:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 02:20 UT.
Don [2021-05-12 02:25, Sugarloaf]

· This return binary was observed by Hana Kucakova and Kamil Hornoch from here on the past two nights. There appears to be a part of event; a tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/07344_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07344_2021a_p1.png

More high-quality data (errors < 0.015 mag) are needed. As there will be other high-priority targets here on coming nights ---this target was observed as a supplementary target here on the past nights and we don't have a telescope time to take more data for it on coming nights---, I encourage others here to take over. A tentative event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-11 8.22 0.250
2021- 4-12 1.63 0.250
2021- 4-12 19.04 0.250
2021- 4-13 12.45 0.250
2021- 4-14 5.86 0.250
2021- 4-14 23.27 0.250
2021- 4-15 16.68 0.250
2021- 4-16 10.09 0.250
2021- 4-17 3.50 0.250
2021- 4-17 20.91 0.250
2021- 4-18 14.32 0.250
2021- 4-19 7.73 0.250
2021- 4-20 1.14 0.250
2021- 4-20 18.55 0.250
2021- 4-21 11.96 0.250
2021- 4-22 5.37 0.250
2021- 4-22 22.78 0.250
2021- 4-23 16.19 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-11 16.91 0.750
2021- 4-12 10.32 0.750
2021- 4-13 3.73 0.750
2021- 4-13 21.14 0.750
2021- 4-14 14.55 0.750
2021- 4-15 7.96 0.750
2021- 4-16 1.37 0.750
2021- 4-16 18.78 0.750
2021- 4-17 12.19 0.750
2021- 4-18 5.60 0.750
2021- 4-18 23.01 0.750
2021- 4-19 16.42 0.750
2021- 4-20 9.83 0.750
2021- 4-21 3.24 0.750
2021- 4-21 20.65 0.750
2021- 4-22 14.06 0.750
2021- 4-23 7.47 0.750

Clear Skies, Petr [2021-04-11 06:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Insufficient data, target closed. Petr [2019-12-10 09:01, Ondrejov]

· Started this rather dim target on Dec 1 UT.
Don [2019-12-02 01:16, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Our announcement on this one has appeared on CBET 4412, copied below for your convenience.

Cheers, Petr

(7344) SUMMERFIELD
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, H. Kucakova, K. Hornoch, and P. Kusnirak, Ondrejov Observatory;
V. Chiorny, Kharkiv Observatory; N. Gaftonyuk, Crimean Astrophysical
Observatory; and V. Benishek, Belgrade Astronomical Observatory, report that
photometric observations taken with a 0.50-m telescope at the Sugarloaf
Mountain Observatory, a 0.65-m telescope at the Ondrejov Observatory, a
0.70-m telescope at the Chuguev station of the Kharkiv Observatory in
Ukraine, a 1.0-m telescope at the Crimean Astrophysical Observatory, and
a 0.35-m telescope at the Sopot Observatory in Serbia during May 16-June 15
reveal that minor planet (7344) is a binary system with an orbital period of
17.41 Â± 0.01 hr. The primary shows a period of 2.58975 Â± 0.00003 hr and
has a lightcurve amplitude of 0.17 mag at solar phases 9-15 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events
that are 0.03- to 0.07-magnitude deep indicate a secondary-to-primary
mean-diameter ratio of 0.18 Â± 0.03. The mean absolute R magnitude in the
Cousins system is H_R = 12.88 Â± 0.08, assuming the phase relation slope
parameter G = 0.24 Â± 0.11.

2017 July 5 (CBET 4412) Daniel W. E. Green [2017-07-10 06:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have finished observations for this new binary, and do a CBET now. With D_2/D_1 = 0.18 +/- 0.03, this one is at the effective limit for our binary asteroid survey ---btw, it's still the same limit as we had in our binary NEA survey Pravec et al. 2006---, but the events are consistently detected thanks to the good quality data with errors 0.01-0.02 mag.
http://www.asu.cas.cz/~asteroid/07344_porb.png
http://www.asu.cas.cz/~asteroid/07344_p1.png

Cheers, Petr [2017-07-04 09:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 01:40 to catch the 0.25 event at 4.56 UT.
Don [2017-06-21 01:25, Sugarloaf] Message sent to observers

· I observed the event 0.25.
Nelya. [2017-06-16 01:52, Simeiz]

· I started this at 01:40 UT, and hope to catch the 0.250 event.
Don [2017-06-15 01:52, Sugarloaf] Message sent to observers

· Observed on June 03-04, 20:04-01:12 UT.
Vladimir [2017-06-04 16:13, Sopot AO]

· Our current solution:
http://www.asu.cas.cz/~asteroid/07344_porb.png
http://www.asu.cas.cz/~asteroid/07344_p1.png
P_orb is unique now. One more coverage of the 0.25-phase event with errors < 0.02 mag (probably after the Full Moon) is needed before we publish this one on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 6- 4 22.95 0.250
2017- 6-12 22.46 0.250
2017- 6-13 15.87 0.250
2017- 6-14 9.28 0.250
2017- 6-15 2.69 0.250
2017- 6-15 20.10 0.250
2017- 6-16 13.51 0.250
2017- 6-17 6.92 0.250
2017- 6-18 0.33 0.250
2017- 6-18 17.74 0.250
2017- 6-19 11.15 0.250
2017- 6-20 4.56 0.250
2017- 6-20 21.97 0.250
2017- 6-21 15.38 0.250
2017- 6-22 8.79 0.250
2017- 6-23 2.20 0.250
2017- 6-23 19.61 0.250
2017- 6-24 13.02 0.250
2017- 6-25 6.43 0.250
2017- 6-25 23.84 0.250
2017- 6-26 17.25 0.250
2017- 6-27 10.66 0.250
2017- 6-28 4.07 0.250
2017- 6-28 21.48 0.250
2017- 6-29 14.89 0.250
2017- 6-30 8.30 0.250
2017- 7- 1 1.71 0.250
2017- 7- 1 19.12 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2017- 6- 5 7.71 0.754
2017- 6-12 13.81 0.754
2017- 6-13 7.22 0.754
2017- 6-14 0.63 0.754
2017- 6-14 18.04 0.754
2017- 6-15 11.45 0.754
2017- 6-16 4.86 0.754
2017- 6-16 22.27 0.754
2017- 6-17 15.68 0.754
2017- 6-18 9.09 0.754
2017- 6-19 2.50 0.754
2017- 6-19 19.91 0.754
2017- 6-20 13.32 0.754
2017- 6-21 6.73 0.754
2017- 6-22 0.14 0.754
2017- 6-22 17.55 0.754
2017- 6-23 10.96 0.754
2017- 6-24 4.37 0.754
2017- 6-24 21.78 0.754
2017- 6-25 15.19 0.754
2017- 6-26 8.60 0.754
2017- 6-27 2.01 0.754
2017- 6-27 19.42 0.754
2017- 6-28 12.83 0.754
2017- 6-29 6.24 0.754
2017- 6-29 23.65 0.754
2017- 6-30 17.06 0.754
2017- 7- 1 10.47 0.754
2017- 7- 2 3.88 0.754

Clear Skies, Petr [2017-06-04 14:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 02:40 UT.
Don [2017-06-04 02:35, Sugarloaf] Message sent to observers

· Started this one at 02:00 UT.
Don [2017-06-03 01:57, Sugarloaf]

· At last, a clear night.
I started this at 01:45 UT. [2017-06-02 01:50, Sugarloaf]

· I observed this target on 01 June from 19:15 UT.
Vasilij Ch. [2017-06-01 23:47, Kharkiv] Message sent to observers

· Another night by Hana Kucakova and Kamil Hornoch from here joined in, captured another event. P_orb is likely 17.41 h, but a couple other values are not entirely ruled out yet, so more data at any times are needed. The current preferred solution:
http://www.asu.cas.cz/~asteroid/07344_porb.png
http://www.asu.cas.cz/~asteroid/07344_p1.png

I point out that errors not greater than 0.02 mag are needed and long sessions are preferred.

Clear Skies, Petr [2017-06-01 09:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Additional observations by Hana Kucakova, Kamil Hornoch and Peter Kusnirak from here and by Vladimir Benishek from Sopot were taken. Thanks to the precisely linked Ondrejov observations, we have resolved another event. There are several possible values for P_orb, the following plot is for one of them:
http://www.asu.cas.cz/~asteroid/07344_porb.png
http://www.asu.cas.cz/~asteroid/07344_p1.png

We need to capture more events so that we can nail down it. Errors not greater than 0.02 mag are needed and long sessions are preferred.

Clear Skies, Petr [2017-05-31 05:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this target at 20 h UT. Nelya. [2017-05-28 21:32, Simeiz] Message sent to observers

· This new target has been observed by Don Pray from Sugarloaf Mountain, by Vasilij Chiorny from Kharkiv, and by Hana Kucakova and Kamil Hornoch from here. There appears to be an attenuation in the first 10 points of the 2017-05-21 run, see
http://www.asu.cas.cz/~asteroid/07344.png
http://www.asu.cas.cz/~asteroid/07344_20170521.png

We need to take more data to confirm it. Errors not greater than 0.02 mag are needed and long sessions are preferred. I encourage others here to help out Don.

Clear Skies, Petr [2017-05-27 11:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one on 24 May from 20:55 to 23:40 UT.
Vasilij Ch. [2017-05-24 23:48, Kharkiv] Message sent to observers

· Observed this target about 4 hrs from 19:25 UT. Vasilij Ch. [2017-05-23 23:31, Kharkiv]

· Don Pray took first data for this new target. However, the solution is not unique; one of a couple possible solutions:
http://www.asu.cas.cz/~asteroid/07344.png

Two consecutive nights (with errors < 0.03 mag) are needed to nail down it. As the weather forecast for Don's station is poor for the next week, we encourage others here to help out with (effectively take over) this target.

Clear Skies, Petr [2017-05-22 12:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this new target on May 16 UT.
Don [2017-05-17 01:39, Sugarloaf]

(2121) Sevastopol (Finished) - binary [Add new note]
· This one is closed for the 5th apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2024-03-01 12:57, Ondrejov]

· Don Pray has observed this returned binary from Sugarloaf Mountain recently, catched an event. Current lightcurve decomposition (still somewhat weak because of the limited coverage):
https://www.asu.cas.cz/~asteroid/02121_2023a_porb.png
https://www.asu.cas.cz/~asteroid/02121_2023a_p1.png

More data (errors 0.01 mag) are needed to improve it. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 9-21 20.02 0.252
2023- 9-23 9.15 0.252
2023- 9-24 22.28 0.252
2023- 9-26 11.41 0.252
2023-10- 4 5.06 0.252
2023-10- 5 18.19 0.252
2023-10- 7 7.32 0.252
2023-10- 8 20.45 0.252
2023-10-10 9.58 0.252
2023-10-11 22.71 0.252
2023-10-13 11.84 0.252
2023-10-15 0.97 0.252
2023-10-16 14.10 0.252
2023-10-18 3.23 0.252
2023-10-19 16.36 0.252
2023-10-21 5.49 0.252
2023-10-22 18.62 0.252
2023-10-24 7.75 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2023- 9-22 14.57 0.752
2023- 9-24 3.70 0.752
2023- 9-25 16.83 0.752
2023-10- 4 23.61 0.752
2023-10- 6 12.74 0.752
2023-10- 8 1.87 0.752
2023-10- 9 15.00 0.752
2023-10-11 4.13 0.752
2023-10-12 17.26 0.752
2023-10-14 6.39 0.752
2023-10-15 19.52 0.752
2023-10-17 8.65 0.752
2023-10-18 21.78 0.752
2023-10-20 10.91 0.752
2023-10-22 0.04 0.752
2023-10-23 13.17 0.752

Clear Skies, Petr [2023-09-21 11:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one on Aug 24.
Don [2023-08-25 16:20, Sugarloaf]

· The object closed for the 4th apparition. Petr [2019-06-12 12:14, Ondrejov]

· further observations on 04/02,04/03,04/05 [2019-04-06 10:41, Blue Mountains Obs] Message sent to observers

· Start observing this return binary on its 4th apparition 03/30 [2019-03-31 07:59, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Apparition finished, starting modeling. Petr [2012-04-02 08:39, Ondrejov]

· Observing from 18:30 UT in good conditions. Michal [2012-03-13 18:33, SkalnatePleso] [Remove]
Message sent to observers

· observed under good conditions the portion of 0.246 event [2012-03-13 13:03, Via Capote]

· One event was covered by Kamil from here in the past lunation:
http://www.asu.cas.cz/~asteroid/02121_12_porb.png
http://www.asu.cas.cz/~asteroid/02121_12_p1.png

More data with errors <= 0.02 mag for both events (as well as some outside them) would be good to take in the rest of this apparition; a modeling attempt after this second apparition should be promissing. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-11 14.12 0.246
2012- 3-13 3.25 0.246
2012- 3-14 16.38 0.246
2012- 3-16 5.51 0.246
2012- 3-17 18.64 0.246
2012- 3-19 7.77 0.246
2012- 3-20 20.90 0.246
2012- 3-22 10.03 0.246
2012- 3-23 23.16 0.246
2012- 3-25 12.29 0.246
2012- 3-27 1.42 0.246
2012- 3-28 14.55 0.246
2012- 3-30 3.68 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-12 8.92 0.753
2012- 3-13 22.05 0.753
2012- 3-15 11.18 0.753
2012- 3-17 0.31 0.753
2012- 3-18 13.44 0.753
2012- 3-20 2.57 0.753
2012- 3-21 15.70 0.753
2012- 3-23 4.83 0.753
2012- 3-24 17.96 0.753
2012- 3-26 7.09 0.753
2012- 3-27 20.22 0.753
2012- 3-29 9.35 0.753

Clear Skies, Petr [2012-03-05 11:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one tonight. Best wishes, Kamil and Adrian [2012-02-11 18:59, Ondrejov] Message sent to observers

· observed under generally good conditions with a few high thin passing clouds, the 0.748 phase event from 04:00-07:00UT [2012-02-04 13:14, Via Capote]

· will observe this object starting at 03:00-07:00 to recover the 0.246 phase event [2012-02-04 01:38, Via Capote] Message sent to observers

· observed under good conditions the 0.246 phase event from 09:00-12:30UT [2012-02-03 14:08, Via Capote]

· Conditions are forecast to be good tonight. Will observe this target for the 0.246 event [2012-02-03 01:26, Via Capote] Message sent to observers

· Great first data for this one taken by Kamil Hornoch and Peter Kusnirak from here and by Marek Husarik, Michal Pikler and Gabriel Cervak from Skalnate Pleso in its current second apparition:
http://www.asu.cas.cz/~asteroid/02121_12_porb.png
http://www.asu.cas.cz/~asteroid/02121_12_p1.png
Cf. with data from the 2010 discovery apparition:
http://www.asu.cas.cz/~asteroid/02121_1008_porb.png
http://www.asu.cas.cz/~asteroid/02121_1008_p1.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png
http://www.asu.cas.cz/~asteroid/02121_1012_porb.png
http://www.asu.cas.cz/~asteroid/02121_1012_p1.png

More data with errors <= 0.02 mag for both events (as well as some outside them) would be good; a modeling attempt after this second apparition should be promissing. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 3 11.00 0.246
2012- 2-11 4.65 0.246
2012- 2-12 17.78 0.246
2012- 2-14 6.91 0.246
2012- 2-15 20.04 0.246
2012- 2-17 9.17 0.246
2012- 2-18 22.30 0.246
2012- 2-20 11.43 0.246
2012- 2-22 0.56 0.246
2012- 2-23 13.69 0.246
2012- 2-25 2.82 0.246
2012- 2-26 15.95 0.246
2012- 2-28 5.08 0.246
2012- 2-29 18.21 0.246
2012- 3- 2 7.34 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 2 16.49 0.748
2012- 2- 4 5.62 0.748
2012- 2-11 23.27 0.748
2012- 2-13 12.40 0.748
2012- 2-15 1.53 0.748
2012- 2-16 14.66 0.748
2012- 2-18 3.79 0.748
2012- 2-19 16.92 0.748
2012- 2-21 6.05 0.748
2012- 2-22 19.18 0.748
2012- 2-24 8.31 0.748
2012- 2-25 21.44 0.748
2012- 2-27 10.57 0.748
2012- 2-28 23.70 0.748
2012- 3- 1 12.83 0.748
2012- 3- 3 1.96 0.748

Clear Skies, Petr [2012-02-02 13:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Peter K. has captured an event on the past night:
http://www.asu.cas.cz/~asteroid/02121_12_porb.png
http://www.asu.cas.cz/~asteroid/02121_12_p1.png
(Periods fixed at the estimates from the 2010 discovery apparition.)

More data for both events are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 1 22.01 0.250
2012- 2- 3 11.14 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 2 16.56 0.750
2012- 2- 4 5.69 0.750

Clear Skies, Petr [2012-02-01 12:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19 UT. Peter K. [2012-01-31 22:28, Ondrejov] Message sent to observers

· Observing from 20:10 UT in average conditions. Michal [2012-01-28 20:12, SkalnatePleso] [Remove]

· First run for this return binary in this apparition was taken by Kamil Hornoch from here, a solution using the periods estimated we obtained in the discovery apparition:
http://www.asu.cas.cz/~asteroid/02121_12_porb.png
http://www.asu.cas.cz/~asteroid/02121_12_p1.png
Cf. with data from the discovery apparition:
http://www.asu.cas.cz/~asteroid/02121_1008_porb.png
http://www.asu.cas.cz/~asteroid/02121_1008_p1.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png
http://www.asu.cas.cz/~asteroid/02121_1012_porb.png
http://www.asu.cas.cz/~asteroid/02121_1012_p1.png

Though Kamil has not captured an event, the apparent trend in his data seen after subtracting the primary lightcurve suggests that he got it at orbit phase around 0.5 (half way between mutual events) sometimes in the second half of the night. With this assumption, I give a tentative events ephemeris below. Don't confine your observations, however, just to around the predicted times as I may be wrong.

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-29 18.46 0.250
2012- 1-31 7.59 0.250
2012- 2- 1 20.72 0.250
2012- 2- 3 9.85 0.250
2012- 2- 4 22.98 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-27 10.75 0.750
2012- 1-28 23.88 0.750
2012- 1-30 13.01 0.750
2012- 2- 1 2.14 0.750
2012- 2- 2 15.27 0.750
2012- 2- 4 4.40 0.750

Clear Skies, Petr [2012-01-27 07:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 20:00 UT and expecting full-night run, if weather permit. Best wishes, Kamil [2012-01-26 20:13, Ondrejov]

· Joe took three additional nights for this binary with PROMPT during Dec. 6-9. As expected, it showed a "double" event character again, with the eclipse and occultation spatially/temporally separated at the (relatively) high solar phase of 27 deg:
http://www.asu.cas.cz/~asteroid/02121_1012_porb.png
http://www.asu.cas.cz/~asteroid/02121_1012_p1.png
Cf. with data from August-October when the events showed an analogous evolution with changing solar phase:
http://www.asu.cas.cz/~asteroid/02121_1008_porb.png
http://www.asu.cas.cz/~asteroid/02121_1008_p1.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png

The discovery apparition for this binary is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great work all. It will be a great dataset for modeling after observations at different ecliptic longitude are taken in future.

Cheers, Petr [2011-01-04 13:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began observing from Prompt at 0040 UT under excellent conditions. Attempting to cover 0.245 phase event centered at 0336 UT. Should get most of event. Combination with 12/6 observations should give whole 0.245 event. Out of event 5 hour run done last night. Joe [2010-12-09 00:53, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt at 0040 UT under excellent conditions. Attempting to cover 0.245 phase event centered at 0118 UT. Event already in progress at beginning of observations. Joe [2010-12-06 00:49, Dark Sky & PROMPT] Message sent to observers

· Observed 20 and 21 Nov 2010 in moon lit conditions. [2010-11-21 22:28, HuntersHill]

· Two new sessions by Kamil from here and by David from Hunters Hill added to the solution, both covered the secondary event:
http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png
It still had a classical character for total occultation+eclipse events, broadened with the increased solar phase. More evolution of both events, likely splitting into "double events" should be seen already now or soon with the further increasing solar phase. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010-11-25 5.33 0.245
2010-11-26 18.47 0.245
2010-11-28 7.61 0.245
2010-11-29 20.75 0.245
2010-12- 1 9.89 0.245
2010-12- 2 23.03 0.245
2010-12- 4 12.17 0.245
2010-12- 6 1.31 0.245
2010-12- 7 14.45 0.245
2010-12- 9 3.59 0.245
2010-12-10 16.73 0.245
2010-12-12 5.87 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2010-11-25 23.89 0.745
2010-11-27 13.03 0.745
2010-11-29 2.17 0.745
2010-11-30 15.31 0.745
2010-12- 2 4.45 0.745
2010-12- 3 17.59 0.745
2010-12- 5 6.73 0.745
2010-12- 6 19.87 0.745
2010-12- 8 9.01 0.745
2010-12- 9 22.15 0.745
2010-12-11 11.29 0.745

Clear Skies, Petr [2010-11-18 10:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2010-10-31 in reasonable conditions. Covered second half of the 0.25 phase event. [2010-11-01 21:21, HuntersHill] Message sent to observers

· I will try this one from 18:00 UT and then (3309) from 22:35 UT, if weather hold. Best wishes, Kamil [2010-10-29 15:03, Ondrejov]

· Monitoring of this binary by several of us during this apparition provided great data for future modeling of the system:
http://www.asu.cas.cz/~asteroid/02121_1008_porb.png
http://www.asu.cas.cz/~asteroid/02121_1008_p1.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png
http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png

The asteroid will be still well observable in the next lunation and its further monitoring should provide more great data. Specifically, we expect a gradual return to the "double" character of the events with increasing solar phase, similar to that we saw in August, though their shapes may differ from the August ones in smaller or bigger details and such differences (or not) will bring further good information on the system. I encourage you to observe it; long (best if linked) sessions with errors < 0.02 mag are needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010-10-26 19.75 0.250
2010-10-28 8.88 0.250
2010-10-29 22.01 0.250
2010-10-31 11.14 0.250
2010-11- 2 0.27 0.250
2010-11- 3 13.40 0.250
2010-11- 5 2.53 0.250
2010-11- 6 15.66 0.250
2010-11- 8 4.79 0.250
2010-11- 9 17.92 0.250
2010-11-11 7.05 0.250
2010-11-12 20.18 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010-10-26 1.17 0.750
2010-10-27 14.30 0.750
2010-10-29 3.43 0.750
2010-10-30 16.56 0.750
2010-11- 1 5.69 0.750
2010-11- 2 18.82 0.750
2010-11- 4 7.95 0.750
2010-11- 5 21.08 0.750
2010-11- 7 10.21 0.750
2010-11- 8 23.34 0.750
2010-11-10 12.47 0.750
2010-11-12 1.60 0.750
2010-11-13 14.73 0.750

Clear Skies, Petr [2010-10-19 12:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:00 UT in good conditions. Michal [2010-10-12 19:04, SkalnatePleso] [Remove]
Message sent to observers

· observed from 11.29 to 14:29UT 2010 09 16 capturing part of 0.25 phase. [2010-09-17 11:34, Blue Mountains Obs]

· Since Joe is covering 15700, I will try to cover the event on this one tonight. Will start about 4:45 UT under marginal conditions. May cloud over before the end of the night.

Russ [2010-09-14 03:14, Shed of Science] Message sent to observers

· More data especially for the 0.25-phase (secondary) event are needed. Ephemeris for the rest of this lunation:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 9-15 0.97 0.250
2010- 9-16 14.09 0.250
2010- 9-18 3.21 0.250
2010- 9-19 16.33 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 9-14 6.32 0.748
2010- 9-15 19.44 0.748
2010- 9-17 8.56 0.748
2010- 9-18 21.68 0.748

Clear Skies, Petr [2010-09-13 11:37, Ondrejov]

· Planing to observe from 20:45 UT and cover whole secondary event. Peter K. [2010-09-11 18:40, Ondrejov] Message sent to observers

· Currently observing under excellent conditions at Prompt. Hope to get 0.750 phase event centered at 0330 UT. Joe [2010-09-11 01:51, Dark Sky & PROMPT]

· started observation on 2010 09 06 just before the midpoint of the 0.75 event but cut short by clouds on completion of event. [2010-09-07 13:12, Blue Mountains Obs] Message sent to observers

· Currently observing under excellent conditions at Prompt. Just passed mid-time for 0.250 event. Joe [2010-09-07 06:53, Dark Sky & PROMPT]

· Getting out-of-event data tonight with Prompt (excellent conditions so far)and will attempt to get the 0.250 event tomorrow night centered at 0648 UT. [2010-09-06 06:50, Dark Sky & PROMPT] Message sent to observers

· I will try to cover 0.75-phase event tonight, if weather permit. Best wishes, Kamil [2010-09-04 17:33, Ondrejov]

· This night my object from 21:10 UT. Gabo [2010-08-29 21:13, SkalnatePleso] [Remove]
Message sent to observers

· observed on both 2010 08 25 and 26. data on 26 show the predicted attenuation. [2010-08-27 10:34, Blue Mountains Obs]

· The text of CBET 2427 where our announcement on this binary appeared is copied below, for your convenience.

Cheers, Petr

(2121) SEVASTOPOL
D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak, Ondrejov
Observatory; J. Pollock, Appalachian State University; J. Oey, Leura, N.S.W.,
Australia; M. Husarik and G. Cervak, Skalnate Pleso Observatory; and D. E.
Reichart, K. M. Ivarsen, J. B. Haislip, and A. LaCluyze, Physics and Astronomy
Department, University of North Carolina, Chapel Hill, report that photometric
observations obtained during July 23-Aug. 24 reveal that minor planet (2121)
is a binary system with an orbital period of 37.1 hr. The primary shows a
period of 2.90640 ± 0.00002 hr, and it has a lightcurve amplitude of 0.20
mag. Mutual eclipse/occultation events that are 0.2-mag deep indicate a
secondary-to-primary mean-diameter ratio of 0.41 ± 0.02. The secondary
rotates synchronously with the orbital motion and shows an amplitude of 0.06
mag in the combined lightcurve of the system. Due to the high solar phase,
the observed eclipse/occultation events also describe the satellite-shadow
transit and satellite's passage through the parent body's shadow.

2010 August 26 (CBET 2427) Daniel W. E. Green [2010-08-27 06:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· CBET 2427 (2121)Sevastopol has been released [2010-08-27 03:31, HuntersHill] Message sent to observers

· I have drafted the following CBET to Dan Green. Please let me know quickly if any changes are needed as I have already sent it on to Dan:

(2121) Sevastopol
D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak, Ondrejov Observatory; J. Pollock, Prompt Observatory; J. Oey, Leura Observatory; and M. Husarik and G. Cervak, Skalnate Pleso Observatory, report that photometric
observations obtained during July 23 to August 24 reveal that minor planet (2121) is a binary system with an orbital period of 37.1 hr. The primary shows a period of 2.90640 ± 0.00002 hr, and it has a lightcurve amplitude of 0.20 mag. Mutual eclipse/occultation events that are 0.2-mag deep indicate the secondary-to-primary mean-diameter ratio of 0.41 ± 0.02. The secondary rotates synchronously with the orbital motion and it shows an amplitude of 0.06 mag in the combined lightcurve of the system. Due to the high solar phase, the observed eclipse/occultation events also
describe the moon shadow transit and moons passage through the parent bodies shadow. [2010-08-25 12:40, HuntersHill] Message sent to observers

· observed on both 21st and 24th August nights. no attenuation noted. data sent in. [2010-08-25 06:47, Blue Mountains Obs]

· Current solution for this new binary from data by David from Hunters Hill (discoverer), Peter K. from here (three calibrated R nights), Gabo from S. Pleso and Julian from Leura:
P_1 = 2.90634 +/- 0.00002 h
P_orb = 37.10 h (error to be established when more data are available)
P_2 = P_orb (synchronous secondary)
A_1 = 0.20 mag
A_2 = 0.07 mag

A lower limit on D_2/D_1 is 0.40, it should be nailed down with more data.

http://www.asu.cas.cz/~asteroid/02121_porb.png
http://www.asu.cas.cz/~asteroid/02121_p1.png

There occur both occultations and eclipses. The two phenomena were spatially (and therefore temporally) separated on July 23 and Aug 6 at solar phases 31 and 27 deg (see the "double" shape of the 0.75-phase event then), but they were closer one to each other on Aug 22 (solar phase 21 deg) where they already overlapped (note that the "double" shape of the event almost disappeared already).

We especially need to cover the 0.25-phase event to establish the solution well. Monitoring the 0.75-phase event would be useful as well; it will further evolve as the solar phase changes. If we are lucky with favorable event geometry, we may nail down the size ratio as well.

Date/Time UTC (LTc.) Phase
--------------------------
2010- 8-22 19.80 0.250
2010- 8-24 8.90 0.250
2010- 8-25 22.00 0.250
2010- 8-27 11.10 0.250
2010- 8-29 0.20 0.250
2010- 8-30 13.30 0.250
2010- 9- 1 2.40 0.250
2010- 9- 2 15.50 0.250
2010- 9- 4 4.60 0.250
2010- 9- 5 17.70 0.250
2010- 9- 7 6.80 0.250
2010- 9- 8 19.90 0.250
2010- 9-10 9.00 0.250
2010- 9-11 22.10 0.250
2010- 9-13 11.20 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 8-23 14.34 0.750
2010- 8-25 3.44 0.750
2010- 8-26 16.54 0.750
2010- 8-28 5.64 0.750
2010- 8-29 18.74 0.750
2010- 8-31 7.84 0.750
2010- 9- 1 20.94 0.750
2010- 9- 3 10.04 0.750
2010- 9- 4 23.14 0.750
2010- 9- 6 12.24 0.750
2010- 9- 8 1.34 0.750
2010- 9- 9 14.44 0.750
2010- 9-11 3.54 0.750
2010- 9-12 16.64 0.750
2010- 9-14 5.74 0.750

Clear Skies, Petr [2010-08-22 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2010 08 21 in poor conditions. Data somewhat noisy but no significant deviations noted.

Based on a dual period search from my data alone, I get the following preliminary results:
P1 = 2.90641 +/- 0.00006hrs
P_Orb = 37.074 +/- 0.008hrs
D2/D1 = 0.38 [2010-08-22 05:15, HuntersHill] Message sent to observers

· Observing from 22:20 UT and covering 0.75-phase event(s). Peter K. [2010-08-22 00:16, Ondrejov]

· Observed 2010-08-21 from 0250-1004 UT from Prompt. Joe [2010-08-21 15:45, Dark Sky & PROMPT] Message sent to observers

· Observed on 2010 08 20,19, and 17 with attenuation observed on the last day. data sent in. [2010-08-21 07:43, Blue Mountains Obs]

· Observing from 22:20 UT and should get 4.5 hours of observation. Peter K. [2010-08-20 23:32, Ondrejov] Message sent to observers

· Observing from 22:30 UT. Peter K. [2010-08-19 22:51, Ondrejov]

· Observed 2010 08 17 in less than ideal conditions. Data reveals a period of 2.9064 +/- 0.0003hrs with an amplitude of 0.15 +/- 0.02mag with deviations of up to 0.3mag observed. [2010-08-18 05:25, HuntersHill] Message sent to observers

· Observed 2010 08 08 in reasonable conditions. A period of 2.906 +/- 0.001hrs, amplitude of 0.2 +/- 0.02mag now derived with significant deviations in the curve. [2010-08-08 22:41, HuntersHill]

· Observed 2010 08 06 and 2010 08 07 in reasonable conditions. I cannot yet resolve a period plot for this target though it feels like it should be something in the 2-4 hr range. [2010-08-07 21:52, HuntersHill] Message sent to observers

· This my object from 20:30 UT. Gabo [2010-08-07 20:04, SkalnatePleso] [Remove]

· Observed 2010 07 23 in reasonable conditions. Data reveals a period of 2.95 +/- 0.03hrs with an amplitude of 0.3 +/- 0.02mag. An interesting shaped lightcurve. [2010-07-25 01:51, HuntersHill] Message sent to BinAstPhotSurvey conference

(2121) Sevastopol (Finished) - binary	[Add new note]
·	This one is closed for the 5th apparition. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2024-03-01 12:57, Ondrejov]

·	Don Pray has observed this returned binary from Sugarloaf Mountain recently, catched an event. Current lightcurve decomposition (still somewhat weak because of the limited coverage): https://www.asu.cas.cz/~asteroid/02121_2023a_porb.png https://www.asu.cas.cz/~asteroid/02121_2023a_p1.png More data (errors 0.01 mag) are needed to improve it. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2023- 9-21 20.02 0.252 2023- 9-23 9.15 0.252 2023- 9-24 22.28 0.252 2023- 9-26 11.41 0.252 2023-10- 4 5.06 0.252 2023-10- 5 18.19 0.252 2023-10- 7 7.32 0.252 2023-10- 8 20.45 0.252 2023-10-10 9.58 0.252 2023-10-11 22.71 0.252 2023-10-13 11.84 0.252 2023-10-15 0.97 0.252 2023-10-16 14.10 0.252 2023-10-18 3.23 0.252 2023-10-19 16.36 0.252 2023-10-21 5.49 0.252 2023-10-22 18.62 0.252 2023-10-24 7.75 0.252 Date/Time UTC (LTc.) Phase -------------------------- 2023- 9-22 14.57 0.752 2023- 9-24 3.70 0.752 2023- 9-25 16.83 0.752 2023-10- 4 23.61 0.752 2023-10- 6 12.74 0.752 2023-10- 8 1.87 0.752 2023-10- 9 15.00 0.752 2023-10-11 4.13 0.752 2023-10-12 17.26 0.752 2023-10-14 6.39 0.752 2023-10-15 19.52 0.752 2023-10-17 8.65 0.752 2023-10-18 21.78 0.752 2023-10-20 10.91 0.752 2023-10-22 0.04 0.752 2023-10-23 13.17 0.752 Clear Skies, Petr [2023-09-21 11:18, Ondrejov]

·	I started this one on Aug 24. Don [2023-08-25 16:20, Sugarloaf]



·	The object closed for the 4th apparition. Petr [2019-06-12 12:14, Ondrejov]

·	further observations on 04/02,04/03,04/05 [2019-04-06 10:41, Blue Mountains Obs]

·	Start observing this return binary on its 4th apparition 03/30 [2019-03-31 07:59, Blue Mountains Obs]



·	Apparition finished, starting modeling. Petr [2012-04-02 08:39, Ondrejov]

·	Observing from 18:30 UT in good conditions. Michal [2012-03-13 18:33, SkalnatePleso]	[Remove]

·	observed under good conditions the portion of 0.246 event [2012-03-13 13:03, Via Capote]

·	One event was covered by Kamil from here in the past lunation: http://www.asu.cas.cz/~asteroid/02121_12_porb.png http://www.asu.cas.cz/~asteroid/02121_12_p1.png More data with errors <= 0.02 mag for both events (as well as some outside them) would be good to take in the rest of this apparition; a modeling attempt after this second apparition should be promissing. Events ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2012- 3-11 14.12 0.246 2012- 3-13 3.25 0.246 2012- 3-14 16.38 0.246 2012- 3-16 5.51 0.246 2012- 3-17 18.64 0.246 2012- 3-19 7.77 0.246 2012- 3-20 20.90 0.246 2012- 3-22 10.03 0.246 2012- 3-23 23.16 0.246 2012- 3-25 12.29 0.246 2012- 3-27 1.42 0.246 2012- 3-28 14.55 0.246 2012- 3-30 3.68 0.246 Date/Time UTC (LTc.) Phase -------------------------- 2012- 3-12 8.92 0.753 2012- 3-13 22.05 0.753 2012- 3-15 11.18 0.753 2012- 3-17 0.31 0.753 2012- 3-18 13.44 0.753 2012- 3-20 2.57 0.753 2012- 3-21 15.70 0.753 2012- 3-23 4.83 0.753 2012- 3-24 17.96 0.753 2012- 3-26 7.09 0.753 2012- 3-27 20.22 0.753 2012- 3-29 9.35 0.753 Clear Skies, Petr [2012-03-05 11:34, Ondrejov]

·	Observing this one tonight. Best wishes, Kamil and Adrian [2012-02-11 18:59, Ondrejov]

·	observed under generally good conditions with a few high thin passing clouds, the 0.748 phase event from 04:00-07:00UT [2012-02-04 13:14, Via Capote]

·	will observe this object starting at 03:00-07:00 to recover the 0.246 phase event [2012-02-04 01:38, Via Capote]

·	observed under good conditions the 0.246 phase event from 09:00-12:30UT [2012-02-03 14:08, Via Capote]

·	Conditions are forecast to be good tonight. Will observe this target for the 0.246 event [2012-02-03 01:26, Via Capote]

·	Great first data for this one taken by Kamil Hornoch and Peter Kusnirak from here and by Marek Husarik, Michal Pikler and Gabriel Cervak from Skalnate Pleso in its current second apparition: http://www.asu.cas.cz/~asteroid/02121_12_porb.png http://www.asu.cas.cz/~asteroid/02121_12_p1.png Cf. with data from the 2010 discovery apparition: http://www.asu.cas.cz/~asteroid/02121_1008_porb.png http://www.asu.cas.cz/~asteroid/02121_1008_p1.png http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png http://www.asu.cas.cz/~asteroid/02121_1012_porb.png http://www.asu.cas.cz/~asteroid/02121_1012_p1.png More data with errors <= 0.02 mag for both events (as well as some outside them) would be good; a modeling attempt after this second apparition should be promissing. Events ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2012- 2- 3 11.00 0.246 2012- 2-11 4.65 0.246 2012- 2-12 17.78 0.246 2012- 2-14 6.91 0.246 2012- 2-15 20.04 0.246 2012- 2-17 9.17 0.246 2012- 2-18 22.30 0.246 2012- 2-20 11.43 0.246 2012- 2-22 0.56 0.246 2012- 2-23 13.69 0.246 2012- 2-25 2.82 0.246 2012- 2-26 15.95 0.246 2012- 2-28 5.08 0.246 2012- 2-29 18.21 0.246 2012- 3- 2 7.34 0.246 Date/Time UTC (LTc.) Phase -------------------------- 2012- 2- 2 16.49 0.748 2012- 2- 4 5.62 0.748 2012- 2-11 23.27 0.748 2012- 2-13 12.40 0.748 2012- 2-15 1.53 0.748 2012- 2-16 14.66 0.748 2012- 2-18 3.79 0.748 2012- 2-19 16.92 0.748 2012- 2-21 6.05 0.748 2012- 2-22 19.18 0.748 2012- 2-24 8.31 0.748 2012- 2-25 21.44 0.748 2012- 2-27 10.57 0.748 2012- 2-28 23.70 0.748 2012- 3- 1 12.83 0.748 2012- 3- 3 1.96 0.748 Clear Skies, Petr [2012-02-02 13:28, Ondrejov]

·	Peter K. has captured an event on the past night: http://www.asu.cas.cz/~asteroid/02121_12_porb.png http://www.asu.cas.cz/~asteroid/02121_12_p1.png (Periods fixed at the estimates from the 2010 discovery apparition.) More data for both events are needed; events ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2012- 2- 1 22.01 0.250 2012- 2- 3 11.14 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2012- 2- 2 16.56 0.750 2012- 2- 4 5.69 0.750 Clear Skies, Petr [2012-02-01 12:49, Ondrejov]

·	Observing from 19 UT. Peter K. [2012-01-31 22:28, Ondrejov]

·	Observing from 20:10 UT in average conditions. Michal [2012-01-28 20:12, SkalnatePleso]	[Remove]

·	First run for this return binary in this apparition was taken by Kamil Hornoch from here, a solution using the periods estimated we obtained in the discovery apparition: http://www.asu.cas.cz/~asteroid/02121_12_porb.png http://www.asu.cas.cz/~asteroid/02121_12_p1.png Cf. with data from the discovery apparition: http://www.asu.cas.cz/~asteroid/02121_1008_porb.png http://www.asu.cas.cz/~asteroid/02121_1008_p1.png http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png http://www.asu.cas.cz/~asteroid/02121_1012_porb.png http://www.asu.cas.cz/~asteroid/02121_1012_p1.png Though Kamil has not captured an event, the apparent trend in his data seen after subtracting the primary lightcurve suggests that he got it at orbit phase around 0.5 (half way between mutual events) sometimes in the second half of the night. With this assumption, I give a tentative events ephemeris below. Don't confine your observations, however, just to around the predicted times as I may be wrong. Date/Time UTC (LTc.) Phase -------------------------- 2012- 1-29 18.46 0.250 2012- 1-31 7.59 0.250 2012- 2- 1 20.72 0.250 2012- 2- 3 9.85 0.250 2012- 2- 4 22.98 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2012- 1-27 10.75 0.750 2012- 1-28 23.88 0.750 2012- 1-30 13.01 0.750 2012- 2- 1 2.14 0.750 2012- 2- 2 15.27 0.750 2012- 2- 4 4.40 0.750 Clear Skies, Petr [2012-01-27 07:26, Ondrejov]

·	Started this one at 20:00 UT and expecting full-night run, if weather permit. Best wishes, Kamil [2012-01-26 20:13, Ondrejov]



·	Joe took three additional nights for this binary with PROMPT during Dec. 6-9. As expected, it showed a "double" event character again, with the eclipse and occultation spatially/temporally separated at the (relatively) high solar phase of 27 deg: http://www.asu.cas.cz/~asteroid/02121_1012_porb.png http://www.asu.cas.cz/~asteroid/02121_1012_p1.png Cf. with data from August-October when the events showed an analogous evolution with changing solar phase: http://www.asu.cas.cz/~asteroid/02121_1008_porb.png http://www.asu.cas.cz/~asteroid/02121_1008_p1.png http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png The discovery apparition for this binary is finished, http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Great work all. It will be a great dataset for modeling after observations at different ecliptic longitude are taken in future. Cheers, Petr [2011-01-04 13:48, Ondrejov]

·	Began observing from Prompt at 0040 UT under excellent conditions. Attempting to cover 0.245 phase event centered at 0336 UT. Should get most of event. Combination with 12/6 observations should give whole 0.245 event. Out of event 5 hour run done last night. Joe [2010-12-09 00:53, Dark Sky & PROMPT]

·	Began observing from Prompt at 0040 UT under excellent conditions. Attempting to cover 0.245 phase event centered at 0118 UT. Event already in progress at beginning of observations. Joe [2010-12-06 00:49, Dark Sky & PROMPT]

·	Observed 20 and 21 Nov 2010 in moon lit conditions. [2010-11-21 22:28, HuntersHill]

·	Two new sessions by Kamil from here and by David from Hunters Hill added to the solution, both covered the secondary event: http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png It still had a classical character for total occultation+eclipse events, broadened with the increased solar phase. More evolution of both events, likely splitting into "double events" should be seen already now or soon with the further increasing solar phase. Events ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2010-11-25 5.33 0.245 2010-11-26 18.47 0.245 2010-11-28 7.61 0.245 2010-11-29 20.75 0.245 2010-12- 1 9.89 0.245 2010-12- 2 23.03 0.245 2010-12- 4 12.17 0.245 2010-12- 6 1.31 0.245 2010-12- 7 14.45 0.245 2010-12- 9 3.59 0.245 2010-12-10 16.73 0.245 2010-12-12 5.87 0.245 Date/Time UTC (LTc.) Phase -------------------------- 2010-11-25 23.89 0.745 2010-11-27 13.03 0.745 2010-11-29 2.17 0.745 2010-11-30 15.31 0.745 2010-12- 2 4.45 0.745 2010-12- 3 17.59 0.745 2010-12- 5 6.73 0.745 2010-12- 6 19.87 0.745 2010-12- 8 9.01 0.745 2010-12- 9 22.15 0.745 2010-12-11 11.29 0.745 Clear Skies, Petr [2010-11-18 10:19, Ondrejov]

·	Observed 2010-10-31 in reasonable conditions. Covered second half of the 0.25 phase event. [2010-11-01 21:21, HuntersHill]

·	I will try this one from 18:00 UT and then (3309) from 22:35 UT, if weather hold. Best wishes, Kamil [2010-10-29 15:03, Ondrejov]

·	Monitoring of this binary by several of us during this apparition provided great data for future modeling of the system: http://www.asu.cas.cz/~asteroid/02121_1008_porb.png http://www.asu.cas.cz/~asteroid/02121_1008_p1.png http://www.asu.cas.cz/~asteroid/02121_1009_10_porb.png http://www.asu.cas.cz/~asteroid/02121_1009_10_p1.png The asteroid will be still well observable in the next lunation and its further monitoring should provide more great data. Specifically, we expect a gradual return to the "double" character of the events with increasing solar phase, similar to that we saw in August, though their shapes may differ from the August ones in smaller or bigger details and such differences (or not) will bring further good information on the system. I encourage you to observe it; long (best if linked) sessions with errors < 0.02 mag are needed. Events ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2010-10-26 19.75 0.250 2010-10-28 8.88 0.250 2010-10-29 22.01 0.250 2010-10-31 11.14 0.250 2010-11- 2 0.27 0.250 2010-11- 3 13.40 0.250 2010-11- 5 2.53 0.250 2010-11- 6 15.66 0.250 2010-11- 8 4.79 0.250 2010-11- 9 17.92 0.250 2010-11-11 7.05 0.250 2010-11-12 20.18 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2010-10-26 1.17 0.750 2010-10-27 14.30 0.750 2010-10-29 3.43 0.750 2010-10-30 16.56 0.750 2010-11- 1 5.69 0.750 2010-11- 2 18.82 0.750 2010-11- 4 7.95 0.750 2010-11- 5 21.08 0.750 2010-11- 7 10.21 0.750 2010-11- 8 23.34 0.750 2010-11-10 12.47 0.750 2010-11-12 1.60 0.750 2010-11-13 14.73 0.750 Clear Skies, Petr [2010-10-19 12:42, Ondrejov]

·	Observing from 19:00 UT in good conditions. Michal [2010-10-12 19:04, SkalnatePleso]	[Remove]

·	observed from 11.29 to 14:29UT 2010 09 16 capturing part of 0.25 phase. [2010-09-17 11:34, Blue Mountains Obs]

·	Since Joe is covering 15700, I will try to cover the event on this one tonight. Will start about 4:45 UT under marginal conditions. May cloud over before the end of the night. Russ [2010-09-14 03:14, Shed of Science]

·	More data especially for the 0.25-phase (secondary) event are needed. Ephemeris for the rest of this lunation: Date/Time UTC (LTc.) Phase -------------------------- 2010- 9-15 0.97 0.250 2010- 9-16 14.09 0.250 2010- 9-18 3.21 0.250 2010- 9-19 16.33 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2010- 9-14 6.32 0.748 2010- 9-15 19.44 0.748 2010- 9-17 8.56 0.748 2010- 9-18 21.68 0.748 Clear Skies, Petr [2010-09-13 11:37, Ondrejov]

·	Planing to observe from 20:45 UT and cover whole secondary event. Peter K. [2010-09-11 18:40, Ondrejov]

·	Currently observing under excellent conditions at Prompt. Hope to get 0.750 phase event centered at 0330 UT. Joe [2010-09-11 01:51, Dark Sky & PROMPT]

·	started observation on 2010 09 06 just before the midpoint of the 0.75 event but cut short by clouds on completion of event. [2010-09-07 13:12, Blue Mountains Obs]

·	Currently observing under excellent conditions at Prompt. Just passed mid-time for 0.250 event. Joe [2010-09-07 06:53, Dark Sky & PROMPT]

·	Getting out-of-event data tonight with Prompt (excellent conditions so far)and will attempt to get the 0.250 event tomorrow night centered at 0648 UT. [2010-09-06 06:50, Dark Sky & PROMPT]

·	I will try to cover 0.75-phase event tonight, if weather permit. Best wishes, Kamil [2010-09-04 17:33, Ondrejov]

·	This night my object from 21:10 UT. Gabo [2010-08-29 21:13, SkalnatePleso]	[Remove]

·	observed on both 2010 08 25 and 26. data on 26 show the predicted attenuation. [2010-08-27 10:34, Blue Mountains Obs]

·	The text of CBET 2427 where our announcement on this binary appeared is copied below, for your convenience. Cheers, Petr (2121) SEVASTOPOL D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak, Ondrejov Observatory; J. Pollock, Appalachian State University; J. Oey, Leura, N.S.W., Australia; M. Husarik and G. Cervak, Skalnate Pleso Observatory; and D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A. LaCluyze, Physics and Astronomy Department, University of North Carolina, Chapel Hill, report that photometric observations obtained during July 23-Aug. 24 reveal that minor planet (2121) is a binary system with an orbital period of 37.1 hr. The primary shows a period of 2.90640 ± 0.00002 hr, and it has a lightcurve amplitude of 0.20 mag. Mutual eclipse/occultation events that are 0.2-mag deep indicate a secondary-to-primary mean-diameter ratio of 0.41 ± 0.02. The secondary rotates synchronously with the orbital motion and shows an amplitude of 0.06 mag in the combined lightcurve of the system. Due to the high solar phase, the observed eclipse/occultation events also describe the satellite-shadow transit and satellite's passage through the parent body's shadow. 2010 August 26 (CBET 2427) Daniel W. E. Green [2010-08-27 06:22, Ondrejov]

·	CBET 2427 (2121)Sevastopol has been released [2010-08-27 03:31, HuntersHill]

·	I have drafted the following CBET to Dan Green. Please let me know quickly if any changes are needed as I have already sent it on to Dan: (2121) Sevastopol D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak, Ondrejov Observatory; J. Pollock, Prompt Observatory; J. Oey, Leura Observatory; and M. Husarik and G. Cervak, Skalnate Pleso Observatory, report that photometric observations obtained during July 23 to August 24 reveal that minor planet (2121) is a binary system with an orbital period of 37.1 hr. The primary shows a period of 2.90640 ± 0.00002 hr, and it has a lightcurve amplitude of 0.20 mag. Mutual eclipse/occultation events that are 0.2-mag deep indicate the secondary-to-primary mean-diameter ratio of 0.41 ± 0.02. The secondary rotates synchronously with the orbital motion and it shows an amplitude of 0.06 mag in the combined lightcurve of the system. Due to the high solar phase, the observed eclipse/occultation events also describe the moon shadow transit and moons passage through the parent bodies shadow. [2010-08-25 12:40, HuntersHill]

·	observed on both 21st and 24th August nights. no attenuation noted. data sent in. [2010-08-25 06:47, Blue Mountains Obs]

·	Current solution for this new binary from data by David from Hunters Hill (discoverer), Peter K. from here (three calibrated R nights), Gabo from S. Pleso and Julian from Leura: P_1 = 2.90634 +/- 0.00002 h P_orb = 37.10 h (error to be established when more data are available) P_2 = P_orb (synchronous secondary) A_1 = 0.20 mag A_2 = 0.07 mag A lower limit on D_2/D_1 is 0.40, it should be nailed down with more data. http://www.asu.cas.cz/~asteroid/02121_porb.png http://www.asu.cas.cz/~asteroid/02121_p1.png There occur both occultations and eclipses. The two phenomena were spatially (and therefore temporally) separated on July 23 and Aug 6 at solar phases 31 and 27 deg (see the "double" shape of the 0.75-phase event then), but they were closer one to each other on Aug 22 (solar phase 21 deg) where they already overlapped (note that the "double" shape of the event almost disappeared already). We especially need to cover the 0.25-phase event to establish the solution well. Monitoring the 0.75-phase event would be useful as well; it will further evolve as the solar phase changes. If we are lucky with favorable event geometry, we may nail down the size ratio as well. Date/Time UTC (LTc.) Phase -------------------------- 2010- 8-22 19.80 0.250 2010- 8-24 8.90 0.250 2010- 8-25 22.00 0.250 2010- 8-27 11.10 0.250 2010- 8-29 0.20 0.250 2010- 8-30 13.30 0.250 2010- 9- 1 2.40 0.250 2010- 9- 2 15.50 0.250 2010- 9- 4 4.60 0.250 2010- 9- 5 17.70 0.250 2010- 9- 7 6.80 0.250 2010- 9- 8 19.90 0.250 2010- 9-10 9.00 0.250 2010- 9-11 22.10 0.250 2010- 9-13 11.20 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2010- 8-23 14.34 0.750 2010- 8-25 3.44 0.750 2010- 8-26 16.54 0.750 2010- 8-28 5.64 0.750 2010- 8-29 18.74 0.750 2010- 8-31 7.84 0.750 2010- 9- 1 20.94 0.750 2010- 9- 3 10.04 0.750 2010- 9- 4 23.14 0.750 2010- 9- 6 12.24 0.750 2010- 9- 8 1.34 0.750 2010- 9- 9 14.44 0.750 2010- 9-11 3.54 0.750 2010- 9-12 16.64 0.750 2010- 9-14 5.74 0.750 Clear Skies, Petr [2010-08-22 08:38, Ondrejov]

·	Observed 2010 08 21 in poor conditions. Data somewhat noisy but no significant deviations noted. Based on a dual period search from my data alone, I get the following preliminary results: P1 = 2.90641 +/- 0.00006hrs P_Orb = 37.074 +/- 0.008hrs D2/D1 = 0.38 [2010-08-22 05:15, HuntersHill]

·	Observing from 22:20 UT and covering 0.75-phase event(s). Peter K. [2010-08-22 00:16, Ondrejov]

·	Observed 2010-08-21 from 0250-1004 UT from Prompt. Joe [2010-08-21 15:45, Dark Sky & PROMPT]

·	Observed on 2010 08 20,19, and 17 with attenuation observed on the last day. data sent in. [2010-08-21 07:43, Blue Mountains Obs]

·	Observing from 22:20 UT and should get 4.5 hours of observation. Peter K. [2010-08-20 23:32, Ondrejov]

·	Observing from 22:30 UT. Peter K. [2010-08-19 22:51, Ondrejov]

·	Observed 2010 08 17 in less than ideal conditions. Data reveals a period of 2.9064 +/- 0.0003hrs with an amplitude of 0.15 +/- 0.02mag with deviations of up to 0.3mag observed. [2010-08-18 05:25, HuntersHill]

·	Observed 2010 08 08 in reasonable conditions. A period of 2.906 +/- 0.001hrs, amplitude of 0.2 +/- 0.02mag now derived with significant deviations in the curve. [2010-08-08 22:41, HuntersHill]

·	Observed 2010 08 06 and 2010 08 07 in reasonable conditions. I cannot yet resolve a period plot for this target though it feels like it should be something in the 2-4 hr range. [2010-08-07 21:52, HuntersHill]

·	This my object from 20:30 UT. Gabo [2010-08-07 20:04, SkalnatePleso]	[Remove]

·	Observed 2010 07 23 in reasonable conditions. Data reveals a period of 2.95 +/- 0.03hrs with an amplitude of 0.3 +/- 0.02mag. An interesting shaped lightcurve. [2010-07-25 01:51, HuntersHill]

(2006) Polonskaya (Finished) - 3-period system [Add new note]
· This one is closed for the 7th apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2024-03-01 12:49, Ondrejov]

· Don Pray has taken more data for this returned 3-period system from Sugarloaf Mountain in the past lunation. Decompositions of the available data:
https://www.asu.cas.cz/~asteroid/02006_2023a_p1.png
https://www.asu.cas.cz/~asteroid/02006_2023a_p2.png
https://www.asu.cas.cz/~asteroid/02006_2023a_porb.png
https://www.asu.cas.cz/~asteroid/02006_2023b_p1.png
https://www.asu.cas.cz/~asteroid/02006_2023b_p2.png
https://www.asu.cas.cz/~asteroid/02006_2023b_porb.png

More high-quality data (errors 0.01 mag) would be useful for further refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2024- 1-29 15.67 0.250
2024- 1-30 10.82 0.250
2024- 1-31 5.98 0.250
2024- 2- 1 1.13 0.250
2024- 2- 1 20.29 0.250
2024- 2- 2 15.44 0.250
2024- 2- 3 10.60 0.250
2024- 2- 4 5.75 0.250
2024- 2- 5 0.91 0.250
2024- 2- 5 20.06 0.250
2024- 2- 6 15.22 0.250
2024- 2- 7 10.37 0.250
2024- 2- 8 5.53 0.250
2024- 2- 9 0.68 0.250
2024- 2- 9 19.84 0.250
2024- 2-10 14.99 0.250
2024- 2-11 10.15 0.250
2024- 2-12 5.30 0.250
2024- 2-13 0.46 0.250
2024- 2-13 19.61 0.250
2024- 2-14 14.77 0.250
2024- 2-15 9.92 0.250
2024- 2-16 5.08 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2024- 1-29 6.08 0.750
2024- 1-30 1.24 0.750
2024- 1-30 20.39 0.750
2024- 1-31 15.55 0.750
2024- 2- 1 10.70 0.750
2024- 2- 2 5.86 0.750
2024- 2- 3 1.01 0.750
2024- 2- 3 20.17 0.750
2024- 2- 4 15.32 0.750
2024- 2- 5 10.48 0.750
2024- 2- 6 5.63 0.750
2024- 2- 7 0.79 0.750
2024- 2- 7 19.94 0.750
2024- 2- 8 15.10 0.750
2024- 2- 9 10.25 0.750
2024- 2-10 5.41 0.750
2024- 2-11 0.56 0.750
2024- 2-11 19.72 0.750
2024- 2-12 14.87 0.750
2024- 2-13 10.03 0.750
2024- 2-14 5.18 0.750
2024- 2-15 0.34 0.750
2024- 2-15 19.49 0.750
2024- 2-16 14.65 0.750

Clear Skies, Petr [2024-01-22 13:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· First, thank you all who expressed your sympathy and concerns about the gun violence at the Charles University on December 21. Fortunately, all of us here at Ondrejov as well as our friends and colleagues are fine, as far as I know.

Don Pray observed this returned 3-period system from Sugarloaf Mountain in December, see following lc decomposition of his data:
https://www.asu.cas.cz/~asteroid/02006_2023a_p1.png
https://www.asu.cas.cz/~asteroid/02006_2023a_p2.png
https://www.asu.cas.cz/~asteroid/02006_2023a_porb.png

More high-quality data (errors 0.01 mag) are needed to improve the solution for further modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2024- 1- 2 12.40 0.250
2024- 1- 3 7.55 0.250
2024- 1- 4 2.71 0.250
2024- 1- 4 21.86 0.250
2024- 1- 5 17.02 0.250
2024- 1- 6 12.17 0.250
2024- 1- 7 7.33 0.250
2024- 1- 8 2.48 0.250
2024- 1- 8 21.64 0.250
2024- 1- 9 16.79 0.250
2024- 1-10 11.95 0.250
2024- 1-11 7.10 0.250
2024- 1-12 2.26 0.250
2024- 1-12 21.41 0.250
2024- 1-13 16.57 0.250
2024- 1-14 11.72 0.250
2024- 1-15 6.88 0.250
2024- 1-16 2.03 0.250
2024- 1-16 21.19 0.250
2024- 1-17 16.34 0.250
2024- 1-18 11.50 0.250
2024- 1-19 6.65 0.250
2024- 1-20 1.81 0.250
2024- 1-20 20.96 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2024- 1- 2 21.97 0.750
2024- 1- 3 17.12 0.750
2024- 1- 4 12.28 0.750
2024- 1- 5 7.43 0.750
2024- 1- 6 2.59 0.750
2024- 1- 6 21.74 0.750
2024- 1- 7 16.90 0.750
2024- 1- 8 12.05 0.750
2024- 1- 9 7.21 0.750
2024- 1-10 2.36 0.750
2024- 1-10 21.52 0.750
2024- 1-11 16.67 0.750
2024- 1-12 11.83 0.750
2024- 1-13 6.98 0.750
2024- 1-14 2.14 0.750
2024- 1-14 21.29 0.750
2024- 1-15 16.45 0.750
2024- 1-16 11.60 0.750
2024- 1-17 6.76 0.750
2024- 1-18 1.91 0.750
2024- 1-18 21.07 0.750
2024- 1-19 16.22 0.750
2024- 1-20 11.38 0.750

Clear Skies, Petr [2024-01-02 11:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one on Dec 7.
Don [2023-12-07 23:19, Sugarloaf]

· Done in the 6th apparition.

Petr [2019-10-09 13:52, Ondrejov]

· observed last night for 5 hours centered at the event 09/18 covering 0.25 phase. good condition with <0.01 mag error. [2019-09-29 07:21, Blue Mountains Obs] Message sent to observers

· Don Pray has observed this return 3-period system from Sugarloaf Mountain on 5 nights in its current 6th apparition:
http://www.asu.cas.cz/~asteroid/02006_2019a_p1.png
http://www.asu.cas.cz/~asteroid/02006_2019a_p2.png
http://www.asu.cas.cz/~asteroid/02006_2019a_porb.png

Covering each of the two events once more (with errors 0.01 mag; don't bother in less ideal conditions) will be good for refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 9-26 23.14 0.235
2019- 9-27 18.29 0.235
2019- 9-28 13.45 0.235
2019- 9-29 8.60 0.235
2019- 9-30 3.76 0.235
2019- 9-30 22.91 0.235
2019-10- 1 18.07 0.235
2019-10- 2 13.22 0.235
2019-10- 3 8.38 0.235
2019-10- 4 3.53 0.235
2019-10- 4 22.69 0.235
2019-10- 5 17.84 0.235
2019-10- 6 13.00 0.235
2019-10- 7 8.15 0.235
2019-10- 8 3.31 0.235
2019-10- 8 22.46 0.235

Date/Time UTC (LTc.) Phase
--------------------------
2019- 9-26 13.72 0.743
2019- 9-27 8.88 0.743
2019- 9-28 4.03 0.743
2019- 9-28 23.19 0.743
2019- 9-29 18.34 0.743
2019- 9-30 13.50 0.743
2019-10- 1 8.65 0.743
2019-10- 2 3.81 0.743
2019-10- 2 22.96 0.743
2019-10- 3 18.12 0.743
2019-10- 4 13.27 0.743
2019-10- 5 8.43 0.743
2019-10- 6 3.58 0.743
2019-10- 6 22.74 0.743
2019-10- 7 17.89 0.743
2019-10- 8 13.05 0.743

Clear Skies, Petr [2019-09-26 09:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one at 01:45 UT
Don [2019-09-25 00:08, Sugarloaf] Message sent to observers

· I observed this one on Sep 21 and also tonight, Sep 22 UT.
Don [2019-09-22 01:10, Sugarloaf]

· Starting this one at 02:15 UT.
Don [2019-09-20 01:32, Sugarloaf] Message sent to observers

· Started this one at 02:20 UT.
Don [2019-09-19 01:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Apparition finished. [2017-02-08 10:35, Ondrejov]

· Started a run at 23:30, Feb 2 UT.
Don [2017-02-02 23:29, Sugarloaf] Message sent to observers

· I started this one at 00:05 UT.
Don [2017-02-02 01:09, Sugarloaf]

· Started a run at 23:30, Jan 30 UT.
Don [2017-01-31 01:10, Sugarloaf]

· Observed on Jan. 28, 17:05-20:55 UT.
Vladimir [2017-01-29 14:00, Sopot AO] Message sent to observers

· I plan to start this at 5:00 UT to catch the 0.257 phase event.
Don [2017-01-16 00:58, Sugarloaf]

· Don Pray took first seven nights for this return 3-period (probable ternary) system in its current apparition:
http://www.asu.cas.cz/~asteroid/02006_2016a_porb.png
http://www.asu.cas.cz/~asteroid/02006_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02006_2016a_p2.png

More data would be useful. Errors < 0.02 mag are needed; don't bother in suboptimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-15 14.24 0.257
2017- 1-16 9.39 0.257
2017- 1-17 4.54 0.257
2017- 1-17 23.69 0.257
2017- 1-18 18.84 0.257
2017- 1-19 13.99 0.257
2017- 1-20 9.14 0.257
2017- 1-21 4.29 0.257
2017- 1-21 23.44 0.257
2017- 1-22 18.59 0.257
2017- 1-23 13.74 0.257
2017- 1-24 8.89 0.257
2017- 1-25 4.04 0.257
2017- 1-25 23.19 0.257
2017- 1-26 18.34 0.257
2017- 1-27 13.49 0.257
2017- 1-28 8.64 0.257
2017- 1-29 3.79 0.257
2017- 1-29 22.94 0.257
2017- 1-30 18.09 0.257
2017- 1-31 13.24 0.257
2017- 2- 1 8.39 0.257
2017- 2- 2 3.54 0.257
2017- 2- 2 22.69 0.257
2017- 2- 3 17.84 0.257
2017- 2- 4 12.99 0.257
2017- 2- 5 8.14 0.257
2017- 2- 6 3.29 0.257
2017- 2- 6 22.44 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-15 23.81 0.757
2017- 1-16 18.96 0.757
2017- 1-17 14.11 0.757
2017- 1-18 9.26 0.757
2017- 1-19 4.41 0.757
2017- 1-19 23.56 0.757
2017- 1-20 18.71 0.757
2017- 1-21 13.86 0.757
2017- 1-22 9.01 0.757
2017- 1-23 4.16 0.757
2017- 1-23 23.31 0.757
2017- 1-24 18.46 0.757
2017- 1-25 13.61 0.757
2017- 1-26 8.76 0.757
2017- 1-27 3.91 0.757
2017- 1-27 23.06 0.757
2017- 1-28 18.21 0.757
2017- 1-29 13.36 0.757
2017- 1-30 8.51 0.757
2017- 1-31 3.66 0.757
2017- 1-31 22.81 0.757
2017- 2- 1 17.96 0.757
2017- 2- 2 13.11 0.757
2017- 2- 3 8.26 0.757
2017- 2- 4 3.41 0.757
2017- 2- 4 22.56 0.757
2017- 2- 5 17.71 0.757
2017- 2- 6 12.86 0.757

Clear Skies, Petr [2017-01-11 11:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 01:20 UT.
Don [2017-01-09 01:37, Sugarloaf] Message sent to observers

· Started this one at 01:30 UT.
Don [2017-01-07 02:17, Sugarloaf]

· Starting this at 02:05 UT.
Don [2017-01-02 01:55, Sugarloaf]

· I started a run at 02:10 UT and hope to get 9 hours on it.
Don [2016-12-31 02:21, Sugarloaf] Message sent to observers

· Plan to start a run on this at 05:30 UT. I should be able to get ~6 hours on it.

Don [2016-12-26 01:06, Sugarloaf]

· I observed this one on Dec 20, and plan to target it tonight (Dec 21), clouds permitting.
Don [2016-12-20 22:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done in the 4th apparition. Petr [2012-12-21 10:45, Ondrejov]

· Don Pray took great data for this 3-p system from Sugarloaf Mountain on eight nights in the past lunation:
http://www.asu.cas.cz/~asteroid/02006_12c_porb.png
http://www.asu.cas.cz/~asteroid/02006_12c_p1.png
http://www.asu.cas.cz/~asteroid/02006_12c_p2.png

Taking last data on the events for the current apparition would be useful (errors <= 0.02 mag needed); events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-12- 1 16.81 0.265
2012-12- 2 11.96 0.265
2012-12- 3 7.11 0.265
2012-12- 4 2.26 0.265
2012-12- 4 21.41 0.265
2012-12- 5 16.56 0.265
2012-12- 6 11.71 0.265
2012-12- 7 6.86 0.265
2012-12- 8 2.01 0.265
2012-12- 8 21.16 0.265
2012-12- 9 16.31 0.265
2012-12-10 11.46 0.265
2012-12-11 6.61 0.265
2012-12-12 1.76 0.265
2012-12-12 20.91 0.265
2012-12-13 16.06 0.265
2012-12-14 11.21 0.265
2012-12-15 6.36 0.265
2012-12-16 1.51 0.265
2012-12-16 20.66 0.265
2012-12-17 15.81 0.265
2012-12-18 10.96 0.265
2012-12-19 6.11 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2012-12- 2 2.40 0.765
2012-12- 2 21.55 0.765
2012-12- 3 16.70 0.765
2012-12- 4 11.85 0.765
2012-12- 5 7.00 0.765
2012-12- 6 2.15 0.765
2012-12- 6 21.30 0.765
2012-12- 7 16.45 0.765
2012-12- 8 11.60 0.765
2012-12- 9 6.75 0.765
2012-12-10 1.90 0.765
2012-12-10 21.05 0.765
2012-12-11 16.20 0.765
2012-12-12 11.35 0.765
2012-12-13 6.50 0.765
2012-12-14 1.65 0.765
2012-12-14 20.80 0.765
2012-12-15 15.95 0.765
2012-12-16 11.10 0.765
2012-12-17 6.25 0.765
2012-12-18 1.40 0.765
2012-12-18 20.55 0.765

Clear Skies, Petr [2012-11-26 11:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 22:30, Nov 19 UT, and will capture the 0.765 event.
Don [2012-11-19 23:00, Sugarloaf]

· Started this around 22:00 Nov 18 UT.
Don [2012-11-19 00:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 22:50, Nov 16 UT.
Don [2012-11-16 23:14, Sugarloaf]

· Started a run at 22:30 UT.
Don [2012-11-14 22:27, Sugarloaf]

· I started a run at 23:00 Nov 11 UT, to catch the 0.765 event.
Don [2012-11-12 01:16, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Good data were taken for this one by Don Pray from Sugarloaf Mountain and by Stefan Gajdos, Adrian Galad and Jirko Silha from Modra in the past lunation:
http://www.asu.cas.cz/~asteroid/02006_12b_porb.png
http://www.asu.cas.cz/~asteroid/02006_12b_p1.png
http://www.asu.cas.cz/~asteroid/02006_12b_p2.png
cf. with the data taken in August-September:
http://www.asu.cas.cz/~asteroid/02006_12a_porb.png
http://www.asu.cas.cz/~asteroid/02006_12a_p1.png
http://www.asu.cas.cz/~asteroid/02006_12a_p2.png

Continued monitoring of its evolution with high-quality observations (covering each of the two events twice per lunation should suffice) would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 4.26 0.265
2012-11- 2 23.41 0.265
2012-11- 3 18.56 0.265
2012-11- 4 13.71 0.265
2012-11- 5 8.86 0.265
2012-11- 6 4.01 0.265
2012-11- 6 23.16 0.265
2012-11- 7 18.31 0.265
2012-11- 8 13.46 0.265
2012-11- 9 8.61 0.265
2012-11-10 3.76 0.265
2012-11-10 22.91 0.265
2012-11-11 18.06 0.265
2012-11-12 13.21 0.265
2012-11-13 8.36 0.265
2012-11-14 3.51 0.265
2012-11-14 22.66 0.265
2012-11-15 17.81 0.265
2012-11-16 12.96 0.265
2012-11-17 8.11 0.265
2012-11-18 3.26 0.265
2012-11-18 22.41 0.265
2012-11-19 17.56 0.265
2012-11-20 12.71 0.265
2012-11-21 7.86 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 13.85 0.765
2012-11- 3 9.00 0.765
2012-11- 4 4.15 0.765
2012-11- 4 23.30 0.765
2012-11- 5 18.45 0.765
2012-11- 6 13.60 0.765
2012-11- 7 8.75 0.765
2012-11- 8 3.90 0.765
2012-11- 8 23.05 0.765
2012-11- 9 18.20 0.765
2012-11-10 13.35 0.765
2012-11-11 8.50 0.765
2012-11-12 3.65 0.765
2012-11-12 22.80 0.765
2012-11-13 17.95 0.765
2012-11-14 13.10 0.765
2012-11-15 8.25 0.765
2012-11-16 3.40 0.765
2012-11-16 22.55 0.765
2012-11-17 17.70 0.765
2012-11-18 12.85 0.765
2012-11-19 8.00 0.765
2012-11-20 3.15 0.765
2012-11-20 22.30 0.765
2012-11-21 17.45 0.765

Clear Skies, Petr [2012-10-29 10:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 00:15 UT.
Don [2012-10-23 00:59, Sugarloaf]

· Observing it from 18:17 UT.
Stefan/Jirko [2012-10-19 19:26, Modra] Message sent to observers

· I started this at 00:30 UT near the bottom of the 0.265 phase event.
Don [2012-10-18 01:29, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 00:40 UT.
Don [2012-10-17 00:38, Sugarloaf]

· Started at 01:00 UT, and should catch the 0.265 phase event.
Don [2012-10-13 01:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Similarly to previous target, this one could also be affected by nearby clouds (and background stars). Adrian [2012-10-10 03:04, Modra] Message sent to observers

· Similarly to previous target, this one could also be affected by nearby clouds (and background stars). Adrian [2012-10-09 23:18, Modra]

· Short run from 19:50 to 21:36 UT was realized for this one. Now focusing to Tokai and 0.75 phase event. [2012-10-08 22:00, SkalnatePleso] [Remove]
Message sent to observers

· Started at 01:25 UT and should catch the 0.76 phase event.
Don [2012-10-07 01:26, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Trying it from 20:15 UT tonight.
Stefan [2012-10-05 20:34, Modra]

· With the extensive observations from Ondrejov, Sugarloaf Mountain and Skalnate Pleso, we are getting a good 3-p solution for this interesting system now:
http://www.asu.cas.cz/~asteroid/02006_12_p1.png
http://www.asu.cas.cz/~asteroid/02006_12_p2.png
http://www.asu.cas.cz/~asteroid/02006_12_porb.png

Monitoring its evolution with high-quality observations (covering each of the two events twice per lunation should suffice) would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 4 10.86 0.265
2012-10- 5 6.01 0.265
2012-10- 6 1.16 0.265
2012-10- 6 20.31 0.265
2012-10- 7 15.46 0.265
2012-10- 8 10.61 0.265
2012-10- 9 5.76 0.265
2012-10-10 0.91 0.265
2012-10-10 20.06 0.265
2012-10-11 15.21 0.265
2012-10-12 10.36 0.265
2012-10-13 5.51 0.265
2012-10-14 0.66 0.265
2012-10-14 19.81 0.265
2012-10-15 14.96 0.265
2012-10-16 10.11 0.265
2012-10-17 5.26 0.265
2012-10-18 0.41 0.265
2012-10-18 19.56 0.265
2012-10-19 14.71 0.265
2012-10-20 9.86 0.265
2012-10-21 5.01 0.265
2012-10-22 0.16 0.265
2012-10-22 19.31 0.265
2012-10-23 14.46 0.265
2012-10-24 9.61 0.265
2012-10-25 4.76 0.265
2012-10-25 23.91 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 4 1.21 0.760
2012-10- 4 20.36 0.760
2012-10- 5 15.51 0.760
2012-10- 6 10.66 0.760
2012-10- 7 5.81 0.760
2012-10- 8 0.96 0.760
2012-10- 8 20.11 0.760
2012-10- 9 15.26 0.760
2012-10-10 10.41 0.760
2012-10-11 5.56 0.760
2012-10-12 0.71 0.760
2012-10-12 19.86 0.760
2012-10-13 15.01 0.760
2012-10-14 10.16 0.760
2012-10-15 5.31 0.760
2012-10-16 0.46 0.760
2012-10-16 19.61 0.760
2012-10-17 14.76 0.760
2012-10-18 9.91 0.760
2012-10-19 5.06 0.760
2012-10-20 0.21 0.760
2012-10-20 19.36 0.760
2012-10-21 14.51 0.760
2012-10-22 9.66 0.760
2012-10-23 4.81 0.760
2012-10-23 23.96 0.760
2012-10-24 19.11 0.760
2012-10-25 14.26 0.760

Clear Skies, Petr [2012-10-01 09:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 02:20 UT.
Don [2012-09-25 02:13, Sugarloaf]

· I'll be starting this at 02:25 UT.
Don [2012-09-24 02:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 02:40 UT.
Don [2012-09-22 02:28, Sugarloaf]

· I'll be starting this at 02:40 UT.
Don [2012-09-21 00:57, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 02:45 UT.
Don [2012-09-20 02:25, Sugarloaf]

· Observing this one from 20:35 UT in a bit cloudy conditions. Best wishes, Kamil [2012-09-17 20:37, Ondrejov] Message sent to observers

· Planning to start this at 03:20 UT.
Don [2012-09-17 01:09, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing from 20:35 UT and should stay on it till morning (3:40 UT). Peter K. [2012-09-16 20:53, Ondrejov] Message sent to observers

· I'm planning to start this at 3:05 UT.
Don [2012-09-16 00:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed for less than three hours last night but part of a secondary event was caught. Peter K. [2012-09-15 06:49, Ondrejov] Message sent to observers

· Will be starting a run on this at 03:10 UT.
Don [2012-09-14 01:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start at 03:15 UT.
Don [2012-09-13 02:27, Sugarloaf]

· This interesting 3-period system (see Pravec et al. 2012a) was observed by Jan Vrastil and Kamil Hornoch from here, by Don Pray from Sugarloaf Mountain, and by Zuzana Kanuchova and Marek Husarik from Skalnate Pleso on six nights during 2012 Sept. 9-12. Current solution:
http://www.asu.cas.cz/~asteroid/02006_12_p1.png
http://www.asu.cas.cz/~asteroid/02006_12_p2.png
http://www.asu.cas.cz/~asteroid/02006_12_porb.png

We still don't understand this system much, more observations are needed. In particular, in this lunation it would be good to take one more coverage of the primary and two coverages of the secondary event. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 9-12 21.74 0.260
2012- 9-13 16.89 0.260
2012- 9-14 12.05 0.260
2012- 9-15 7.20 0.260
2012- 9-16 2.36 0.260
2012- 9-16 21.51 0.260
2012- 9-17 16.67 0.260
2012- 9-18 11.82 0.260
2012- 9-19 6.98 0.260
2012- 9-20 2.13 0.260
2012- 9-20 21.29 0.260
2012- 9-21 16.44 0.260
2012- 9-22 11.60 0.260
2012- 9-23 6.75 0.260
2012- 9-24 1.91 0.260
2012- 9-24 21.06 0.260
2012- 9-25 16.22 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2012- 9-13 7.32 0.760
2012- 9-14 2.48 0.760
2012- 9-14 21.63 0.760
2012- 9-15 16.79 0.760
2012- 9-16 11.94 0.760
2012- 9-17 7.10 0.760
2012- 9-18 2.25 0.760
2012- 9-18 21.41 0.760
2012- 9-19 16.56 0.760
2012- 9-20 11.72 0.760
2012- 9-21 6.87 0.760
2012- 9-22 2.03 0.760
2012- 9-22 21.18 0.760
2012- 9-23 16.34 0.760
2012- 9-24 11.49 0.760
2012- 9-25 6.65 0.760
2012- 9-26 1.80 0.760
2012- 9-26 20.96 0.760

Clear Skies, Petr [2012-09-12 13:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run at 03:20 UT.
Don [2012-09-12 02:38, Sugarloaf]

· Started at 19:11 UT. Zuzana [2012-09-11 19:12, SkalnatePleso] [Remove]
Message sent to observers

· Plan to start this at 03:20 UT.
Don [2012-09-11 02:59, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this at 03:30 UT, clouds permitting.
Don [2012-09-10 02:02, Sugarloaf]

· I plan to start this at 04:30 UT.
Don [2012-08-27 02:12, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start at 04:45 UT. Also observed this last night.
Don [2012-08-23 02:46, Sugarloaf]

· I had to stop it due to more dense cloudiness.
Marek [2012-08-20 23:14, SkalnatePleso] [Remove]
Message sent to observers

· Starting observation for 2006 but clouds from Poland are coming :(
Marek [2012-08-20 21:58, SkalnatePleso] [Remove]

· I plan to start this at 05:05 UT.
Don [2012-08-19 04:07, Sugarloaf] Message sent to BinAstPhotSurvey conference

· We will to continue on this one. Best wishes, Honza and Kamil [2012-08-18 19:07, Ondrejov] Message sent to observers

· Done this one yesterday - from 22:45 to 02:15 UT. Good conditions. Honza [2012-08-18 12:08, Ondrejov]

· Starting at 05:10 UT.
Don [2012-08-17 02:22, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start at 05:40 UT. Target is close to the moon...maybe too close.
Don [2012-08-09 02:12, Sugarloaf]

· Observations from Carbuncle Hill, Ondrejov and Modra on 17 nights have revealed the same 3-periodic lightcurve character as we observed in the discovery apparition in 2005. It is still unclear however whether it is a binary or ternary.
http://www.asu.cas.cz/~asteroid/02006_10_p1.png
http://www.asu.cas.cz/~asteroid/02006_10_p2.png
http://www.asu.cas.cz/~asteroid/02006_10_porb.png
The target is closed now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great observations, guys.

Cheers, Petr [2010-03-04 12:29, Ondrejov]

· Started a run at 23:30 UT.
Don [2010-02-22 01:27, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 00:35 UT.
Don [2010-02-13 00:35, CarbuncleHill]

· Started a run at 00:37 UT.
Don [2010-02-07 00:38, CarbuncleHill]

· I will start this one from 21:15 UT under unpredictable weather conditions... Best wishes, Kamil [2010-02-06 21:05, Ondrejov] Message sent to observers

· Planning this one tonight, starting ~18:50 UT. Jozef, Peter. [2010-01-26 18:39, Modra]

· Very good observations obtained by Don from Carbuncle Hill and by Peter and Kamil from here during 2010 Jan 10-24. It is still not clear whether it is a binary or ternary: the current 3-period solution:
http://www.asu.cas.cz/~asteroid/02006_10_p1.png
http://www.asu.cas.cz/~asteroid/02006_10_p2.png
http://www.asu.cas.cz/~asteroid/02006_10_porb.png

More observations in February would be useful to hopefully nail it down.

Clear Skies, Petr [2010-01-26 14:55, Ondrejov]

· Plan to start a run at 01:55 UT.
Don [2010-01-24 00:59, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Will start a run at 01:55 UT.
Don [2010-01-23 01:17, CarbuncleHill]

· Observing from 22 UT. Peter K. [2010-01-22 23:15, Ondrejov] Message sent to observers

· Plan to start a run at 01:55 UT.
Don [2010-01-22 01:21, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing this one from 19:52 UT. Unfortunately, clouds are coming:-( Best wishes, Kamil [2010-01-16 21:51, Ondrejov] Message sent to observers

· Began a run at 02:35 UT.
Don [2010-01-15 03:07, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run on this at 03:00 UT.
Don [2010-01-11 03:23, CarbuncleHill]

· Started a run on my old friend at 03:00 UT.
Don [2010-01-10 03:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This binary/trinary is already too faint to obtain follow up observations with errors of 0.01 mag with our available instruments, so I'm closing the campaign on this one.

Cheers, Petr [2006-01-17 10:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two long (6 hours each) and two short (0.9-1.3 h) nights by Ninel from Simeiz were sent in by Yura Krugly. Their fit entirely with the three-period solution, their rms residuals are 0.010-0.012 mag. One of the nights was approximately calibrated and it suggests H=13.1 +/-0.2, a little bit fainter than the MPC's rough H value of 12.6.

Cheers, Petr [2005-12-19 18:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data of 2005-12-07.0 by Don from Carbuncle Hill joined in. They complete the coverage of the primary event, fit well with the three-period solution. The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_all_a.png
http://www.asu.cas.cz/~ppravec/2006_shortpc_a.png
http://www.asu.cas.cz/~ppravec/2006_longpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved_a.png
Additional data by Nelya from Simeiz of Nov 30 will be joined in as well after reduction.

The general behaviour -the two additive components that don't go away during the mutual events- is present throughout the dataset. The shape of the secondary events -the short steep decreasing and increasing branches and the flat bottom with a long duration- suggest that we see total events. If so, then the additional (rotational) period that doesn't go away during the events could not be a rotation of the secondary of the eclipsing pair, and a third body is suggested.

It will certainly needed to follow up the system in the next lunation as well. Since it is gradually fading and only data accurate to about 0.01 mag are useful for this one, a collaborative work from a few stations capable to work it (especially Gianluca Masi from Campo Catino and Peter Kusnirak from here) will be needed. The purpose of the further follow up observations in the next lunation is to obtain additional data in changing geometric conditions to further improve and possibly nail down the interpretation of the system.

Cheers, Petr [2005-12-08 13:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one at 22:40 12/6 to cover the primary event.

Don [2005-12-06 22:54, CarbuncleHill]

· Data 2005-12-01.8 by Peter Kusnirak from Ondrejov joined in. They fit well with the three-period solution, the secondary event has been covered well, showing no significant evolution since 11-03.2. The orbital and the rotational periods have been refined to
Porb= 19.14 h (error <0.01 h)
P1= 3.11792 +/-0.00005 h
P2= 6.6572 +/-0.0003 h
The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_all_a.png
http://www.asu.cas.cz/~ppravec/2006_shortpc_a.png
http://www.asu.cas.cz/~ppravec/2006_longpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved_a.png

The behavior is still the same as we have seen during Nov 1-13; the two additive components that don't goes away during the mutual events. After we complete a coverage of the primary event -use the ephemeris that I posted here yesterday- we will look in some more detail on what we can tell on the system's nature (binary vs trinary). Though further follow up will be certainly needed in the next lunation, there are good indications that the secondary of the eclipsing pair is small. We may discuss consequences after we complete the coverage for this lunation.

Cheers, Petr [2005-12-02 12:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data 2005-12-01.8 by Peter Kusnirak from Ondrejov joined in. They fit well with the three-period solution, the secondary event has been covered well, showing no significant evolution since 11-03.2. The orbital and the rotational periods have been refined to
Porb= 19.14 h (error <0.01 h)
P1= 3.11792 +/-0.00005 h
P2= 6.6572 +/-0.0003 h
The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_all_a.png
http://www.asu.cas.cz/~ppravec/2006_shortpc_a.png
http://www.asu.cas.cz/~ppravec/2006_longpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved_a.png

The behavior is still the same as we have seen during Nov 1-13; the two additive components that don't goes away during the mutual events. After we complete a coverage of the primary event -use the ephemeris that I posted here yesterday- we will look in some more detail on what we can tell on the system's nature (binary vs trinary). Though further follow up will be certainly needed in the next lunation, there are good indications that the secondary of the eclipsing pair is small. We may discuss consequences after we complete the coverage for this lunation.

Cheers, Petr [2005-12-02 12:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Here is ephemeris for the primary events:

Date/Time UTC (LTc.) Phase
--------------------------
2005-12- 2 4.80 0.250
2005-12- 2 23.94 0.250
2005-12- 3 19.09 0.250
2005-12- 4 14.23 0.250
2005-12- 5 9.38 0.250
2005-12- 6 4.52 0.250
2005-12- 6 23.67 0.250
2005-12- 7 18.81 0.250

Note that the length of the event is about 2.3 h (unless it has changed).
Most needed are orbital phases of the middle and end of the event and of
the constant part after it; a coverage of earlier phases would be
a bonus to check consistency, but not a critical thing.

Cheers, Petr [2005-12-02 10:41, Ondrejov]

· New data joined in:
2005-11-30.9 by Adrian from Modra
2005-12-01.2 by Don from Carbuncle Hill.
They fit entirely with the three-period solution, Adrian has caught a
part of the secondary event. Observations by Peter K. from Ondrejov
tonight should complete the coverage of the secondary event. I will
send an ephemeris for the primary events (one good night covering it
should suffice) later on in this evening. Current solution see
following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_all_a.png
http://www.asu.cas.cz/~ppravec/2006_shortpc_a.png
http://www.asu.cas.cz/~ppravec/2006_longpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved_a.png

Cheers, Petr [2005-12-02 10:39, Ondrejov]

· It was observed 30/1 Nov from 17:20 to 23:10 UT. [2005-12-02 01:52, Simeiz] Message sent to BinAstPhotSurvey conference

· The 2006 is observed from 17:20 to 23:30, sky is closed. [2005-12-01 00:05, Simeiz]

· Starting 2006 at 19 UT [2005-11-29 19:25, Simeiz]

· New data joined in:
2005-11-24.0 by Don Pray from Carbuncle Hill
2005-11-28.8 by Stefan Gajdos and Adrian Galad from Modra.
They are not so long (2.6 and 4 h of good coverage, respectively), but they are still useful. The recent data (including the two newest sessions) refined the orbital period to 19.145 h with error of 0.01 h, the two rotational periods have been refined as well. The current solution see in following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_all_a.png
http://www.asu.cas.cz/~ppravec/2006_shortpc_a.png
http://www.asu.cas.cz/~ppravec/2006_longpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved_a.png

The recent data still didn't cover the mutual events well, so we still need two good nights with errors of 0.01 mag to cover the two events well.

Fyi, I draw your attention to one small feature in the primary event: In orbital phases 0.19-0.22 in
http://www.asu.cas.cz/~ppravec/2006_orbpc_a.png
there is apparent a "stop" on the decreasing branch of the event in the recent data (in the sessions 11-20.1, 21.1 as well as in the recent Modra data of 11-28.8). The feature is characteristic for both kinds of events -occultation and eclipse- occuring there but just shifted a little bit in time in the given geometry (solar phase, orbit orientation). Very nice feature, it helps in resolving a nature of the system, and it will also contribute well in future modeling of the system's orbit. Seeing it repeating in the data from the three nights gives confidence in even such small feature.

Cheers, Petr [2005-11-29 14:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data of 2005-11-24.2 by Ron and Vishnu from Badlands joined in. They fit well with the three-period solution, covering also a part of the primary mutual event. Current solution see following pictures (the second set of pictures shows only the recent data, to give you a better idea on the recent coverage):
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_all_a.png
http://www.asu.cas.cz/~ppravec/2006_shortpc_a.png
http://www.asu.cas.cz/~ppravec/2006_longpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved_a.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved_a.png

Well, the present situation is such that we still see the same behavior as we have seen during Nov 1-13; the two additive components that don't goes away during the mutual events. The recent data has covered all orbital phases once and some twice, but some orbital phases (scattered around the orbit, and especially the mutual events) need to be covered agaib. A few good nights (errors about 0.01 mag) are therefore still needed to nail down the solution. Then we should see more clearly how much the two additive periods remain there during the events. I expect that after a few good nights, we will either resolve it, or stop the campaign on this one for this lunation.

Cheers, Petr [2005-11-27 16:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· New long session by Don of 11-26.1 joined in. It fits well with the three-period solution, showing one of the mutual event, but there is a small anomaly in the end of the data: after the event, it didn't return to the level as before the event. It may indicate a prolonged duration of the event with changing geometry, but it is needed to confirm it with further data. The current solution see
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png

Cheers, Petr [2005-11-26 18:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 22:30ut, Nov25.

Don [2005-11-25 22:38, CarbuncleHill]

· The 7.4-h long session by Ron and Vishnu from Badlands joined in. It fits well with the three-period solution. There is a smaller part of a mutual event caught in beginning of their session, but those points have slightly higher errors; the partial coverage with the somewhat higher errors still doesn't complete the coverage there and we need to cover the event again well. The current solution see
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png

Cheers, Petr [2005-11-24 11:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting second night here. Should get at least another 8 hours of data. First night data has been reduced.
Vishnu and Ron [2005-11-24 02:26, Vishnu Reddy/Tucson]

· Clear skies here at Badlands. Started observing run at 01:00 UT...should get at least 8 hours of data.
Ron and Vishnu [2005-11-23 03:49, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· High clouds giving me unsatisfactory results on 2006 Polonskaya. If someone else can observe it tonight, that would be good.

Bob Koff [2005-11-22 01:57, AntelopeHills]

· I'll plan on working 2006 Polonskaya tonight. Should be able to observe it from roughly 01:00 to 10:00 UT

Bob Koff
Antelope Hills Observatory [2005-11-21 19:42, AntelopeHills] Message sent to BinAstPhotSurvey conference

· New data by Don Pray of 2005-11-21.1 joined in. Because of less favorable sky conditions, they are a bit more noisy than previous data, and the mutual event is also covered only partially with usable data, so they are consistent with the three-period solution but don't help much to refine it. The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png

We still need to cover both mutual events at least once more with errors about 0.01 mag. Don should be clouded out for a few following nights, others here are encouraged to help out.

Cheers, Petr [2005-11-21 17:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be doing 2006 tonight.

Don [2005-11-20 22:21, CarbuncleHill]

· Two recent nights of 2005-11-19.1 and 20.1 by Don Pray from Carbuncle Hill joined in. They fit nicely with the three-period solution, periods refined, both mutual event caught well. See following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png

We need to cover the mutual events once more with a quality similar or better than the Don's recent data (which both have rms residuals of 0.014 mag). Then we will see what we get there with the mutual events and should be able to plan further observations accordingly. So, I encourage those of you who can work it with errors about 0.01 mag and longer than 3 hours to attend to it.

Cheers, Petr [2005-11-20 17:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 23:30 (11/18).

Don [2005-11-19 01:30, CarbuncleHill]

· Report by Don Pray et al. on the binary (possible trinary) nature of 2006 Polonskaya issued on IAUC 8630 on Wednesday evening, copied below. Note on this added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr

(2006) POLONSKAYA
D. Pray, Greene, RI; P. Pravec and P. Kusnirak, Ondrejov
Observatory; and W. Cooney, J. Gross and D. Terrell, Sonoita
Research Observatory, report that observations obtained during Nov.
1-13 show that the minor planet (2006) consists of a pair of bodies
orbiting each other with a period of 19.15 ± 0.02 hr and
producing mutual eclipse/occultation events 0.06-mag deep. There
are present two rotational lightcurves with periods of 3.1183 ±
0.0002 and 6.656 ± 0.001 hr, with amplitudes of 0.08 and 0.06 mag,
respectively, that persist during the mutual events. This suggests
that either the system is binary with both bodies rotating non-
synchronously with the orbital motion or there is a third body
producing the additional period. A lower limit on the mean-
diameter ratio of the eclipsing pair is 0.22. Further observations
are needed to fully resolve the system.

(C) Copyright 2005 CBAT
2005 November 16 (8630) Daniel W. E. Green [2005-11-18 08:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2005-11-12.3 by Walt, John and Dirk from SRO
2005-11-13.1 by Don from Carbuncle Hill
Also revised data of 2005-11-01.2 by Don replaced old data.

The lightcurve consists of three components. The first component has a period of 3.118 h and amplitude 0.08 mag. The second component has a period of 6.65 h and amplitude 0.06 mag. The two components add together linearly. The third component are attenuations about 0.06 mag deep that repeat at a period of 19.15 h. The three periods are unique, assuming bi-modal shapes of the lightcurve components.

The solution is illustrated by following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_shortpcremoved.png
http://www.asu.cas.cz/~ppravec/2006_orbpc_longpcremoved.png

An interpretation of the observed three-period lightcurve is not entirely straightforward. Unlike in other binary cases where we identify uniquely which lightcurve component belongs to the primary and which to the secondary ---the primary's rotation lightcurve persists there during mutual events while secondary's rotation disappears--- in this case, we see that none of the two rotational components disappears during the attenuations. One possibility is that the mutual events are not total. If so, we couldn't resolve which of the two rotational components belongs to the primary and which belongs to the secondary. There is, however, another possibility that is favored a bit: Shapes of the mutual events suggest that they are total events of a relatively small satellite with Ds/Dp~0.22. If so, then the two rotational components which persist there during the events would belong to the primary and to another, elongated satellite. Considerations of physical plausibility suggest that it would be probably more distant.

The asteroid is effectively unobservable now until November 18 or so. The campaign should be resumed on November 18 or 19; sessions with errors about 0.01 mag or better and longer than 3 hours are needed. The main aim should be to monitor a possible evolution of the mutual events. A detection of such evolution might allow us to resolve the case of binary or trinary asteroid. Nevertheless, if it indeed is a trinary system with two nearby bodies (Porb=19.15 h) and the third body relatively distant, we should ask for AO observations which might resolve it, if its separation is indeed sufficient for the AO technique. If it helped to get the AO observations, we might publish the detection of the three-period lightcurve even now (I would pay line charges for the IAUC item from my grant). Any comments/suggestions?

Cheers, Petr [2005-11-13 18:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don's data of 2005-11-12.2 for this one joined in. The additive two-period solution is holding well, the periods 3.119 h and 6.65 h are unique assuming bi-modal shapes of the components. Don has caught another attenuation event in the last night. See pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_051112.png

The two pairs of events detected on 11-03 and 11-04 and on 11-11 and 11-12 are both separated by 1.2 d. I am optimistic that we will be able to derive Porb eventually, (I will analyze it in detail after completing this lunation for this object with the last night's data from Sonoita, though resuming the campaign in the next lunation will be very needed.)

The asteroid will be too close to the bright Moon tonight for required errors about 0.01 mag. It should be far enough on November 19, so we should resume the campaign on that day.

Cheers, Petr [2005-11-12 20:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have jsut started it too. We'll extend your run tonight Don.

-Walt [2005-11-12 04:00, Sonoita]

· I'll be doing this tonight.

Don [2005-11-11 21:04, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· The Don's persistence with 2006 Polonskaya is paying off eventually. The dataset so far consists of seven nights with duration >3 hours, six of them by Don Pray from Carbuncle Hill and one night by Peter Kusnirak from here. The data begin to make sense now. There appear to be two additive lightcurve components with estimated periods of 3.119 h and 6.65 h (need to be nailed down with more data). The additive two-periodic lightcurve explains most of the data except a few attenuations ~0.06 mag deep and about 2 hours long. They seem to be mutual events, but I need to analyse it more and also include more data that you will obtain for this one to establish it well. The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/2006_all.png
http://www.asu.cas.cz/~ppravec/2006_shortpc.png
http://www.asu.cas.cz/~ppravec/2006_longpc.png
http://www.asu.cas.cz/~ppravec/2006_051103.png
http://www.asu.cas.cz/~ppravec/2006_051104.png
http://www.asu.cas.cz/~ppravec/2006_051111.png
The last three pictures show the three nights that show the attenuations. So, this one looks very interesting: it is a candidate for a fully asynchronous binary; the rotational periods of both components non-synchronous with orbital motion. We will see if the preliminary model holds with new data. Note that only sessions longer than 3 hours and with errors about 0.01 mag or better are going to be useful for this one.

Cheers, Petr [2005-11-11 18:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be trying this tonight, weather permitting.

Don [2005-11-10 22:20, CarbuncleHill]

· I should be able to do a run on this tonight.

Don [2005-11-08 20:03, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Attempting this in "partly cloudy" conditions. Might get lucky.

Don [2005-11-06 00:26, CarbuncleHill]

· Don has taken third night (2005-11-04.2) for this one.

No firm solution yet, but a tentative one see
http://www.asu.cas.cz/~ppravec/2006.png

More data are needed to solve it. Long (or linked) sessions with errors about 0.01 mag will be most useful for it.

Cheers, Petr [2005-11-04 15:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll attempt a run on this (on 11/4) if the wind dies down.

Don [2005-11-03 22:53, CarbuncleHill]

· After two sessions on this, it appears to have two periods superimposed. See the note from Petr:

>>>Don,

Yes, very similar behaviour. I am getting a reasonable fit (though
largely tentative in the long period, but it seems to be commensurate
with 1 day) for the short period about 3.1 h (not unique), see
http://www.asu.cas.cz/~ppravec/2006.png

Well, it looks like you will need a help from different longitudes.
If/when you communicate with other observers, either privately or in the
BinAst group, feel free to use anything from our correspondence.<<<<

So, if anyone can help with this from a different longitude, it would be appreciated.

Don [2005-11-03 18:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(1830) Pogson (Finished) - 3-period system [Add new note]
· This one is closed for the 9th apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2024-03-01 12:36, Ondrejov]

· Don Pray has observed this returned 3-period system in its current apparition from Sugarloaf Mountain on 7 nights; lc decompositions:
http://www.asu.cas.cz/~asteroid/01830_2023a_porb.png
http://www.asu.cas.cz/~asteroid/01830_2023a_p1.png
http://www.asu.cas.cz/~asteroid/01830_2023a_p2.png
http://www.asu.cas.cz/~asteroid/01830_2023b_porb.png
http://www.asu.cas.cz/~asteroid/01830_2023b_p1.png
http://www.asu.cas.cz/~asteroid/01830_2023b_p2.png

More high-quality data (errors < 0.015 mag) would be useful for refined modeling of the system. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 4-16 6.67 0.245
2023- 4-17 6.91 0.245
2023- 4-18 7.15 0.245
2023- 4-19 7.39 0.245
2023- 4-20 7.63 0.245
2023- 4-21 7.87 0.245
2023- 4-22 8.11 0.245
2023- 4-23 8.35 0.245
2023- 4-24 8.59 0.245
2023- 4-25 8.83 0.245
2023- 4-26 9.07 0.245
2023- 4-27 9.31 0.245
2023- 4-28 9.55 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2023- 4-15 18.54 0.745
2023- 4-16 18.78 0.745
2023- 4-17 19.02 0.745
2023- 4-18 19.26 0.745
2023- 4-19 19.50 0.745
2023- 4-20 19.74 0.745
2023- 4-21 19.98 0.745
2023- 4-22 20.22 0.745
2023- 4-23 20.46 0.745
2023- 4-24 20.70 0.745
2023- 4-25 20.94 0.745
2023- 4-26 21.18 0.745
2023- 4-27 21.42 0.745
2023- 4-28 21.66 0.745

Clear Skies, Petr [2023-04-15 07:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this return binary (trinary?) tonight.
Don [2023-03-20 00:01, Sugarloaf]

· This one is closed for the 8th apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-18 10:48, Ondrejov]

· Only limited data were obtained for this 3-period object by Russ Durkee and Don Pray in the past lunation. The primary period and the secondary event were resolved, but the data were insufficient for resolving the P_2 component. Lc decompositions:
http://www.asu.cas.cz/~asteroid/01830_2021a_p1.png
http://www.asu.cas.cz/~asteroid/01830_2021a_p2.png
http://www.asu.cas.cz/~asteroid/01830_2021a_porb.png
http://www.asu.cas.cz/~asteroid/01830_2021b_p1.png
http://www.asu.cas.cz/~asteroid/01830_2021b_porb.png

More high-quality data (errors 0.01 mag; don't bother in sub-optimal conditions) would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-23 19.17 0.256
2021-10-24 19.41 0.256
2021-10-25 19.65 0.256
2021-10-26 19.89 0.256
2021-10-27 20.13 0.256
2021-10-28 20.37 0.256
2021-10-29 20.61 0.256
2021-10-30 20.85 0.256
2021-10-31 21.09 0.256
2021-11- 1 21.33 0.256
2021-11- 2 21.57 0.256
2021-11- 3 21.81 0.256
2021-11- 4 22.05 0.256
2021-11- 5 22.29 0.256
2021-11- 6 22.53 0.256
2021-11- 7 22.77 0.256
2021-11- 8 23.01 0.256
2021-11- 9 23.25 0.256
2021-11-10 23.49 0.256
2021-11-11 23.73 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-24 7.28 0.756
2021-10-25 7.52 0.756
2021-10-26 7.76 0.756
2021-10-27 8.00 0.756
2021-10-28 8.24 0.756
2021-10-29 8.48 0.756
2021-10-30 8.72 0.756
2021-10-31 8.96 0.756
2021-11- 1 9.20 0.756
2021-11- 2 9.44 0.756
2021-11- 3 9.68 0.756
2021-11- 4 9.92 0.756
2021-11- 5 10.16 0.756
2021-11- 6 10.40 0.756
2021-11- 7 10.64 0.756
2021-11- 8 10.88 0.756
2021-11- 9 11.12 0.756
2021-11-10 11.36 0.756
2021-11-11 11.60 0.756

Clear Skies, Petr [2021-10-19 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight

Russ [2021-10-15 02:14, Shed of Science] Message sent to observers

· Doing a run on this tonight.

Russ [2021-10-12 01:57, Shed of Science]

· Doing a run on this tonight to catch the 0.754 phase event.
Don [2021-10-07 01:29, Sugarloaf] Message sent to observers

· Don Pray has observed this return 3-period system in its current apparition from Sugarloaf Mountain on 3 nights, see lc decomposition:
http://www.asu.cas.cz/~asteroid/01830_2021a_p1.png
http://www.asu.cas.cz/~asteroid/01830_2021a_p2.png
http://www.asu.cas.cz/~asteroid/01830_2021a_porb.png

More high-quality data (errors 0.01 mag; don't bother in sub-optimal conditions) would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9- 9 8.56 0.254
2021- 9-10 8.80 0.254
2021- 9-11 9.04 0.254
2021- 9-12 9.28 0.254
2021- 9-13 9.52 0.254
2021- 9-14 9.76 0.254
2021- 9-15 10.00 0.254
2021- 9-16 10.24 0.254
2021- 9-17 10.48 0.254
2021- 9-25 12.40 0.254
2021- 9-26 12.64 0.254
2021- 9-27 12.88 0.254
2021- 9-28 13.12 0.254
2021- 9-29 13.36 0.254
2021- 9-30 13.60 0.254
2021-10- 1 13.84 0.254
2021-10- 2 14.08 0.254
2021-10- 3 14.32 0.254
2021-10- 4 14.56 0.254
2021-10- 5 14.80 0.254
2021-10- 6 15.04 0.254
2021-10- 7 15.28 0.254
2021-10- 8 15.52 0.254
2021-10- 9 15.76 0.254
2021-10-10 16.00 0.254
2021-10-11 16.24 0.254
2021-10-12 16.48 0.254
2021-10-13 16.72 0.254
2021-10-14 16.96 0.254
2021-10-15 17.20 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9- 8 20.43 0.754
2021- 9- 9 20.67 0.754
2021- 9-10 20.91 0.754
2021- 9-11 21.15 0.754
2021- 9-12 21.39 0.754
2021- 9-13 21.63 0.754
2021- 9-14 21.87 0.754
2021- 9-15 22.11 0.754
2021- 9-16 22.35 0.754
2021- 9-17 22.59 0.754
2021- 9-25 0.27 0.754
2021- 9-26 0.51 0.754
2021- 9-27 0.75 0.754
2021- 9-28 0.99 0.754
2021- 9-29 1.23 0.754
2021- 9-30 1.47 0.754
2021-10- 1 1.71 0.754
2021-10- 2 1.95 0.754
2021-10- 3 2.19 0.754
2021-10- 4 2.43 0.754
2021-10- 5 2.67 0.754
2021-10- 6 2.91 0.754
2021-10- 7 3.15 0.754
2021-10- 8 3.39 0.754
2021-10- 9 3.63 0.754
2021-10-10 3.87 0.754
2021-10-11 4.11 0.754
2021-10-12 4.35 0.754
2021-10-13 4.59 0.754
2021-10-14 4.83 0.754
2021-10-15 5.07 0.754

Clear Skies, Petr [2021-09-08 14:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Campaign closed. Petr [2019-01-16 09:09, Ondrejov]

· Data obtained for this 3-period system in its current apparition so far:
http://www.asu.cas.cz/~asteroid/01830_2018a_porb.png
http://www.asu.cas.cz/~asteroid/01830_2018a_p1.png
http://www.asu.cas.cz/~asteroid/01830_2018a_p2.png

More data (errors <= 0.02 mag) would be useful for refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-26 5.46 0.255
2018-12-27 5.70 0.255
2018-12-28 5.94 0.255
2018-12-29 6.18 0.255
2018-12-30 6.42 0.255
2018-12-31 6.66 0.255
2019- 1- 1 6.90 0.255
2019- 1- 2 7.14 0.255
2019- 1- 3 7.38 0.255
2019- 1- 4 7.62 0.255
2019- 1- 5 7.86 0.255
2019- 1- 6 8.10 0.255
2019- 1- 7 8.34 0.255
2019- 1- 8 8.58 0.255
2019- 1- 9 8.82 0.255
2019- 1-10 9.06 0.255
2019- 1-11 9.30 0.255
2019- 1-12 9.54 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-26 17.50 0.752
2018-12-27 17.74 0.752
2018-12-28 17.98 0.752
2018-12-29 18.22 0.752
2018-12-30 18.46 0.752
2018-12-31 18.70 0.752
2019- 1- 1 18.94 0.752
2019- 1- 2 19.18 0.752
2019- 1- 3 19.42 0.752
2019- 1- 4 19.66 0.752
2019- 1- 5 19.90 0.752
2019- 1- 6 20.14 0.752
2019- 1- 7 20.38 0.752
2019- 1- 8 20.62 0.752
2019- 1- 9 20.86 0.752
2019- 1-10 21.10 0.752
2019- 1-11 21.34 0.752
2019- 1-12 21.58 0.752

Clear Skies, Petr [2018-12-19 13:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started 1830 Pogson 12/3 about 3UT, will go until 9UT.

Russ [2018-12-04 03:40, Shed of Science] Message sent to observers

· This return 3-period system has been observed by Don Pray from Sugarloaf Mountain, by Walt Cooney and coll. from SRO, and by Julian Oey from Leura recently. A lc decomposition:
http://www.asu.cas.cz/~asteroid/01830_2018a_porb.png
http://www.asu.cas.cz/~asteroid/01830_2018a_p1.png
http://www.asu.cas.cz/~asteroid/01830_2018a_p2.png

More data for both events would be useful. Only data with errors < 0.02 mag will be useful for refined modeling; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-12- 4 0.02 0.248
2018-12- 5 0.26 0.248
2018-12- 6 0.50 0.248
2018-12- 7 0.74 0.248
2018-12- 8 0.98 0.248
2018-12- 9 1.22 0.248
2018-12-10 1.46 0.248
2018-12-11 1.70 0.248
2018-12-12 1.94 0.248
2018-12-13 2.18 0.248
2018-12-14 2.42 0.248
2018-12-15 2.66 0.248
2018-12-16 2.90 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2018-12- 3 11.89 0.748
2018-12- 4 12.13 0.748
2018-12- 5 12.37 0.748
2018-12- 6 12.61 0.748
2018-12- 7 12.85 0.748
2018-12- 8 13.09 0.748
2018-12- 9 13.33 0.748
2018-12-10 13.57 0.748
2018-12-11 13.81 0.748
2018-12-12 14.05 0.748
2018-12-13 14.29 0.748
2018-12-14 14.53 0.748
2018-12-15 14.77 0.748
2018-12-16 15.01 0.748

Clear Skies, Petr [2018-12-03 07:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 12/01, 11/28 over 5 hours each [2018-12-03 02:23, Blue Mountains Obs] Message sent to observers

· Started 1830 Pogson 12/3 about 3UT, will go until 9UT.

Russ [2018-12-03 01:56, Shed of Science]

· Started a run on this at 01:00 UT.
Don [2018-12-01 01:12, Sugarloaf] Message sent to observers

· Started a run on this at 23:40, Nov 29 UT
Don [2018-11-30 00:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Ran from SRO last night. Submitted the data just now. -Walt [2018-11-16 01:18, Sonoita] Message sent to observers

· Started this 3-period binary.
Don [2018-11-11 20:21, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Great data obtained by Joe Pollock and Julian Oey in the 6th apparition for this 3-period system; sample data:
http://www.asu.cas.cz/~asteroid/01830_2014_p1.png
http://www.asu.cas.cz/~asteroid/01830_2014_p2.png
http://www.asu.cas.cz/~asteroid/01830_2014_porb.png

Cheers, Petr [2014-09-17 14:30, Ondrejov]

· Began observing from Perth at 1530 UT under good conditions. Currently (1900 UT) in the middle 0.257 event which started at 1800 UT. Joe [2014-08-01 18:59, Dark Sky & PROMPT] Message sent to observers

· Got run from Prompt Tololo last night from 0100-0845 UT under good conditions covering the phase 0.757 event centered at 0552 UT. Joe [2014-08-01 18:55, Dark Sky & PROMPT]

· Nice data by Julian Oey from Leura in this apparition:
http://www.asu.cas.cz/~asteroid/01830_2014_p1.png
http://www.asu.cas.cz/~asteroid/01830_2014_p2.png
http://www.asu.cas.cz/~asteroid/01830_2014_porb.png

More data for both events (in good conditions only) would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 7-25 16.31 0.257
2014- 7-26 16.55 0.257
2014- 7-27 16.79 0.257
2014- 7-28 17.03 0.257
2014- 7-29 17.27 0.257
2014- 7-30 17.51 0.257
2014- 7-31 17.75 0.257
2014- 8- 1 17.99 0.257
2014- 8- 2 18.23 0.257
2014- 8- 3 18.47 0.257
2014- 8- 4 18.71 0.257
2014- 8- 5 18.95 0.257
2014- 8- 6 19.19 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2014- 7-26 4.42 0.757
2014- 7-27 4.66 0.757
2014- 7-28 4.90 0.757
2014- 7-29 5.14 0.757
2014- 7-30 5.38 0.757
2014- 7-31 5.62 0.757
2014- 8- 1 5.86 0.757
2014- 8- 2 6.10 0.757
2014- 8- 3 6.34 0.757
2014- 8- 4 6.58 0.757
2014- 8- 5 6.82 0.757
2014- 8- 6 7.06 0.757

Clear Skies, Petr [2014-07-25 08:23, Ondrejov]

· observed on 0711 from 10:11 UT to 19:48 UT. First half of the night captured an event but the second half is poorly effected by wind. [2014-07-12 00:44, Blue Mountains Obs] Message sent to observers

· observed 0708 from 14:26 for 5.5 hours. windy condition but moon is mostly out [2014-07-08 23:21, Blue Mountains Obs]

· Began run from Prompt Tololo at 0205 UT under good conditions. Hope to run until 1030 UT. Joe [2014-07-01 02:29, Dark Sky & PROMPT] Message sent to observers

· Last data for this apparition would be useful; errors <=0.02 mag needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3-30 17.54 0.248
2013- 3-31 17.78 0.248
2013- 4- 1 18.02 0.248
2013- 4- 2 18.26 0.248
2013- 4- 3 18.50 0.248
2013- 4- 4 18.74 0.248
2013- 4- 5 18.98 0.248
2013- 4- 6 19.22 0.248
2013- 4- 7 19.46 0.248
2013- 4- 8 19.70 0.248
2013- 4- 9 19.94 0.248
2013- 4-10 20.18 0.248
2013- 4-11 20.42 0.248
2013- 4-12 20.66 0.248
2013- 4-13 20.90 0.248
2013- 4-14 21.14 0.248
2013- 4-15 21.38 0.248
2013- 4-16 21.62 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3-31 5.79 0.754
2013- 4- 1 6.03 0.754
2013- 4- 2 6.27 0.754
2013- 4- 3 6.51 0.754
2013- 4- 4 6.75 0.754
2013- 4- 5 6.99 0.754
2013- 4- 6 7.23 0.754
2013- 4- 7 7.47 0.754
2013- 4- 8 7.71 0.754
2013- 4- 9 7.95 0.754
2013- 4-10 8.19 0.754
2013- 4-11 8.43 0.754
2013- 4-12 8.67 0.754
2013- 4-13 8.91 0.754
2013- 4-14 9.15 0.754
2013- 4-15 9.39 0.754
2013- 4-16 9.63 0.754

Clear Skies, Petr [2013-03-25 07:07, Ondrejov]

· started the session to capture the 0.255 phase event at 11UT and cut short by approaching bad weather at 14.5UT. [2013-03-18 00:36, Blue Mountains Obs] Message sent to observers

· Kamil Hornoch and Jan Vrastil covered the secondary event sufficiently for this lunation:
http://www.asu.cas.cz/~asteroid/01830_13c_porb.png
http://www.asu.cas.cz/~asteroid/01830_13c_p1.png
http://www.asu.cas.cz/~asteroid/01830_13c_p2.png

Cheers, Petr [2013-03-05 08:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 18:20 UT and plan to get full-night run covering 0.755-phase event. Best wishes, Kamil and Honza [2013-03-02 21:59, Ondrejov] Message sent to observers

· Data obtained for this return binary in its current 5th apparition so far; 4 nights by Don Pray from Sugarloaf Mountain, 2 nights by Stefan Gajdos from Modra and 1 night from here:
http://www.asu.cas.cz/~asteroid/01830_13a_porb.png
http://www.asu.cas.cz/~asteroid/01830_13a_p1.png
http://www.asu.cas.cz/~asteroid/01830_13a_p2.png
http://www.asu.cas.cz/~asteroid/01830_13b_porb.png
http://www.asu.cas.cz/~asteroid/01830_13b_p1.png
http://www.asu.cas.cz/~asteroid/01830_13b_p2.png

Monitoring of the events evolution would be useful for further model refining; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3- 1 10.74 0.255
2013- 3- 2 10.98 0.255
2013- 3- 3 11.22 0.255
2013- 3- 4 11.46 0.255
2013- 3- 5 11.70 0.255
2013- 3- 6 11.94 0.255
2013- 3- 7 12.18 0.255
2013- 3- 8 12.42 0.255
2013- 3- 9 12.66 0.255
2013- 3-10 12.90 0.255
2013- 3-11 13.14 0.255
2013- 3-12 13.38 0.255
2013- 3-13 13.62 0.255
2013- 3-14 13.86 0.255
2013- 3-15 14.10 0.255
2013- 3-16 14.34 0.255
2013- 3-17 14.58 0.255
2013- 3-18 14.82 0.255
2013- 3-19 15.06 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2013- 2-28 22.61 0.755
2013- 3- 1 22.85 0.755
2013- 3- 2 23.09 0.755
2013- 3- 3 23.33 0.755
2013- 3- 4 23.57 0.755
2013- 3- 5 23.81 0.755
2013- 3- 7 0.05 0.755
2013- 3- 8 0.29 0.755
2013- 3- 9 0.53 0.755
2013- 3-10 0.77 0.755
2013- 3-11 1.01 0.755
2013- 3-12 1.25 0.755
2013- 3-13 1.49 0.755
2013- 3-14 1.73 0.755
2013- 3-15 1.97 0.755
2013- 3-16 2.21 0.755
2013- 3-17 2.45 0.755
2013- 3-18 2.69 0.755
2013- 3-19 2.93 0.755
2013- 3-20 3.17 0.755

Clear Skies, Petr [2013-02-26 07:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 23:30, Feb 18 UT.
Don [2013-02-18 23:59, Sugarloaf]

· A new events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 2-12 6.59 0.252
2013- 2-13 6.83 0.252
2013- 2-14 7.07 0.252
2013- 2-15 7.31 0.252
2013- 2-16 7.55 0.252
2013- 2-17 7.79 0.252
2013- 2-18 8.03 0.252
2013- 2-19 8.27 0.252
2013- 2-20 8.51 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2013- 2-11 18.46 0.752
2013- 2-12 18.70 0.752
2013- 2-13 18.94 0.752
2013- 2-14 19.18 0.752
2013- 2-15 19.42 0.752
2013- 2-16 19.66 0.752
2013- 2-17 19.90 0.752
2013- 2-18 20.14 0.752
2013- 2-19 20.38 0.752
2013- 2-20 20.62 0.752

Clear Skies, Petr [2013-02-11 15:57, Ondrejov]

· Plan to start on this at 03:50 UT to capture the 0.250 phase event.
Don [2013-02-10 02:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing it from 22:25 UT on Jan. 12, 2013.
Stefan/Jirko [2013-01-13 01:27, Modra]

· Don Pray's observations on January 3.3 show an evolution of the first half of the "double" secondary event:
http://www.asu.cas.cz/~asteroid/01830_13_porb.png
http://www.asu.cas.cz/~asteroid/01830_13_p1.png
These data are going to be particularly useful for refining the binary model. A regular and frequent monitoring of (both primary and secondary) events would be good, but only observations with a full event coverage are going to be really useful; don't bother if you cannot get a complete event on given night. The events ephemeris I sent here two days ago is valid. Fyi, the current event duration is 3.2 hours, so your observations should cover an interval +/-1.6 h around the predicted mid-event times.

Clear Skies, Petr [2013-01-04 07:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 04:00 UT. Wind is causing some problems.
Don [2013-01-03 03:58, Sugarloaf]

· Don Pray and Stefan Gajdos took first data for this binary in its current 5th apparition, they fit well with our results we published in Pravec et al. (2012a).
http://www.asu.cas.cz/~asteroid/01830_13_porb.png
http://www.asu.cas.cz/~asteroid/01830_13_p1.png

These and subsequent data will be useful for refining the PetrS' current model of the system. Covering both events twice each lunation would be ideal. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 1- 2 20.95 0.250
2013- 1- 3 21.19 0.250
2013- 1- 4 21.43 0.250
2013- 1- 5 21.67 0.250
2013- 1- 6 21.91 0.250
2013- 1- 7 22.15 0.250
2013- 1- 8 22.39 0.250
2013- 1- 9 22.63 0.250
2013- 1-10 22.87 0.250
2013- 1-11 23.11 0.250
2013- 1-12 23.35 0.250
2013- 1-13 23.59 0.250
2013- 1-14 23.83 0.250
2013- 1-16 0.07 0.250
2013- 1-17 0.31 0.250
2013- 1-18 0.55 0.250
2013- 1-19 0.79 0.250
2013- 1-20 1.03 0.250
2013- 1-21 1.27 0.250
2013- 1-22 1.51 0.250
2013- 1-23 1.75 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2013- 1- 3 9.17 0.755
2013- 1- 4 9.41 0.755
2013- 1- 5 9.65 0.755
2013- 1- 6 9.89 0.755
2013- 1- 7 10.13 0.755
2013- 1- 8 10.37 0.755
2013- 1- 9 10.61 0.755
2013- 1-10 10.85 0.755
2013- 1-11 11.09 0.755
2013- 1-12 11.33 0.755
2013- 1-13 11.57 0.755
2013- 1-14 11.81 0.755
2013- 1-15 12.05 0.755
2013- 1-16 12.29 0.755
2013- 1-17 12.53 0.755
2013- 1-18 12.77 0.755
2013- 1-19 13.01 0.755
2013- 1-20 13.25 0.755
2013- 1-21 13.49 0.755
2013- 1-22 13.73 0.755
2013- 1-23 13.97 0.755

Clear Skies, Petr [2013-01-02 12:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 00:10 UT, on Dec. 29, 2012.
Stefan [2012-12-29 03:12, Modra]

· I did a run on this last night (Dec 26 UT), and appear to have captured an event.
Don [2012-12-26 22:01, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Will start at 05:00 UT.

Don [2012-12-15 03:15, Sugarloaf]

· Great data were taken for this 4th apparition:
http://www.asu.cas.cz/~asteroid/01830_110727_0907_porb.png
http://www.asu.cas.cz/~asteroid/01830_110727_0907_p1.png
http://www.asu.cas.cz/~asteroid/01830_110727_0907_p2.png
http://www.asu.cas.cz/~asteroid/01830_110918_1019_porb.png
http://www.asu.cas.cz/~asteroid/01830_110918_1019_p1.png
http://www.asu.cas.cz/~asteroid/01830_110918_1019_p2.png

They will be very useful for refining the model of this system.

Cheers, Petr [2011-11-07 15:31, Ondrejov]

· Observed 2011 09 16 through 2011 10 19 in varing conditions. Data sent to Petr and Peter. [2011-10-19 21:32, HuntersHill] Message sent to observers

· Final (for this apparition) observations would be useful. In addition to monitoring the events, a coverage of at least 7 hours well outside the events is needed as well,
to describe the changing rotational lightcurve components. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011-10-10 6.29 0.250
2011-10-11 6.53 0.250
2011-10-12 6.77 0.250
2011-10-13 7.01 0.250
2011-10-14 7.25 0.250
2011-10-15 7.49 0.250
2011-10-16 7.74 0.250
2011-10-17 7.98 0.250
2011-10-18 8.22 0.250
2011-10-19 8.46 0.250
2011-10-20 8.70 0.250
2011-10-21 8.94 0.250
2011-10-22 9.18 0.250
2011-10-23 9.42 0.250
2011-10-24 9.66 0.250
2011-10-25 9.90 0.250
2011-10-26 10.15 0.250
2011-10-27 10.39 0.250
2011-10-28 10.63 0.250
2011-10-29 10.87 0.250
2011-10-30 11.11 0.250
2011-10-31 11.35 0.250
2011-11- 1 11.59 0.250
2011-11- 2 11.83 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011-10- 9 18.15 0.750
2011-10-10 18.39 0.750
2011-10-11 18.63 0.750
2011-10-12 18.87 0.750
2011-10-13 19.11 0.750
2011-10-14 19.35 0.750
2011-10-15 19.59 0.750
2011-10-16 19.83 0.750
2011-10-17 20.07 0.750
2011-10-18 20.32 0.750
2011-10-19 20.56 0.750
2011-10-20 20.80 0.750
2011-10-21 21.04 0.750
2011-10-22 21.28 0.750
2011-10-23 21.52 0.750
2011-10-24 21.76 0.750
2011-10-25 22.00 0.750
2011-10-26 22.24 0.750
2011-10-27 22.48 0.750
2011-10-28 22.73 0.750
2011-10-29 22.97 0.750
2011-10-30 23.21 0.750
2011-10-31 23.45 0.750

Clear Skies, Petr [2011-10-09 09:55, Ondrejov]

· Began observing from Prompt at 2345 UT under excellent conditions. Hope to cover the 0.252 phase event centered at 0215 UT tonight. Joe [2011-09-25 01:07, Dark Sky & PROMPT] Message sent to observers

· Observed from Prompt 9/22-23 0030-0800 UT under good conditions. Got 0145 UT event. Joe [2011-09-24 21:56, Dark Sky & PROMPT]

· Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 9-14 23.83 0.252
2011- 9-16 0.07 0.252
2011- 9-17 0.31 0.252
2011- 9-18 0.55 0.252
2011- 9-19 0.79 0.252
2011- 9-20 1.03 0.252
2011- 9-21 1.27 0.252
2011- 9-22 1.51 0.252
2011- 9-23 1.75 0.252
2011- 9-24 2.00 0.252
2011- 9-25 2.24 0.252
2011- 9-26 2.48 0.252
2011- 9-27 2.72 0.252
2011- 9-28 2.96 0.252
2011- 9-29 3.20 0.252
2011- 9-30 3.44 0.252
2011-10- 1 3.68 0.252
2011-10- 2 3.92 0.252
2011-10- 3 4.16 0.252
2011-10- 4 4.41 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2011- 9-15 12.15 0.760
2011- 9-16 12.39 0.760
2011- 9-17 12.63 0.760
2011- 9-18 12.87 0.760
2011- 9-19 13.11 0.760
2011- 9-20 13.35 0.760
2011- 9-21 13.59 0.760
2011- 9-22 13.83 0.760
2011- 9-23 14.08 0.760
2011- 9-24 14.32 0.760
2011- 9-25 14.56 0.760
2011- 9-26 14.80 0.760
2011- 9-27 15.04 0.760
2011- 9-28 15.28 0.760
2011- 9-29 15.52 0.760
2011- 9-30 15.76 0.760
2011-10- 1 16.00 0.760
2011-10- 2 16.24 0.760
2011-10- 3 16.49 0.760
2011-10- 4 16.73 0.760

Clear Skies, Petr [2011-09-14 12:08, Ondrejov]

· Observed 20110802 in reasonable conditions and captured the second half of the larger event. [2011-09-06 00:14, HuntersHill] Message sent to observers

· Started this object at 18UT with AC-32 at Abastumani. Hope to continue upto 23:30UT.

Yura [2011-09-01 13:36, Kharkiv]

· Observed 20110825, 26, 27, 28 and 30th in poor to average conditions. Data sent to Petr and Peter for analysis. [2011-08-31 04:21, HuntersHill] Message sent to observers

· Started this object at 18UT with AC-32 at Abastumani. Hope to continue upto 23:30UT.

Yura [2011-08-30 19:05, Kharkiv]

· Began observing with 32" in NC at 0215 UT. Will run to about 0815 UT. Joe [2011-08-29 03:19, Dark Sky & PROMPT] Message sent to observers

· Starting again tonight around 4:15 UT. Should be able to run to about 8UT.

Russ [2011-08-26 03:31, Shed of Science]

· Starting around 4:15 UT, should be able to observe until about 9 UT.

Russ [2011-08-25 03:58, Shed of Science] Message sent to observers

· Current solution with data by David Higgins from Hunters Hill and Vasilij Chiorny from Kharkiv:
http://www.asu.cas.cz/~asteroid/01830_11_porb.png

More data for both events are needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 8-23 18.87 0.253
2011- 8-24 19.12 0.253
2011- 8-25 19.36 0.253
2011- 8-26 19.61 0.253
2011- 8-27 19.85 0.253
2011- 8-28 20.10 0.253
2011- 8-29 20.35 0.253
2011- 8-30 20.59 0.253
2011- 8-31 20.84 0.253
2011- 9- 1 21.08 0.253
2011- 9- 2 21.33 0.253
2011- 9- 3 21.58 0.253
2011- 9- 4 21.82 0.253
2011- 9- 5 22.07 0.253
2011- 9- 6 22.31 0.253
2011- 9- 7 22.56 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2011- 8-24 6.98 0.753
2011- 8-25 7.23 0.753
2011- 8-26 7.47 0.753
2011- 8-27 7.72 0.753
2011- 8-28 7.97 0.753
2011- 8-29 8.21 0.753
2011- 8-30 8.46 0.753
2011- 8-31 8.70 0.753
2011- 9- 1 8.95 0.753
2011- 9- 2 9.19 0.753
2011- 9- 3 9.44 0.753
2011- 9- 4 9.69 0.753
2011- 9- 5 9.93 0.753
2011- 9- 6 10.18 0.753
2011- 9- 7 10.42 0.753

Clear Skies, Petr [2011-08-23 07:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt at 2345 UT under good conditions. Hope to get ~10 hours. Joe [2011-08-21 00:17, Dark Sky & PROMPT] Message sent to observers

· New observation by Vasilij Chiorny from Kharkiv revealed part of second event. See updated pictures bellow. Peter K. [2011-08-02 12:43, Ondrejov]

· David Higgins has taken the first night for this 3-period system in its current 4th apparition. The data are insufficient for a full-fledged solution for the two rotational and the orbital components, a limited solution:
http://www.asu.cas.cz/~asteroid/01830_11_p1.png
http://www.asu.cas.cz/~asteroid/01830_11_p2.png
http://www.asu.cas.cz/~asteroid/01830_11_porb.png
There may or may not be a mutual event captured, more data (long sessions, good quality) are needed to get a good solution. I encourage more observers to work it. See our recently submitted paper
http://www.asu.cas.cz/~asteroid/binorbpoles.pdf
http://www.asu.cas.cz/~asteroid/binorbpoles_si.pdf
for what we have found for the system so far.

Clear Skies, Petr [2011-07-28 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 20110727 from 1151UT to 2000UT in good conditions. Target reveals an eclipsing event in the first part of the session. Data sent to Petr. [2011-07-27 23:08, HuntersHill]

· Extensive data obtained from Ondrejov, PROMPT, Leura, Modra, Kharkiv and Shed of Science Observatory for this 3-P system in the 3rd apparition,
http://www.asu.cas.cz/~asteroid/01830_10_p1.png
http://www.asu.cas.cz/~asteroid/01830_10_p2.png
http://www.asu.cas.cz/~asteroid/01830_10_p2_nsp.png
http://www.asu.cas.cz/~asteroid/01830_10_porb.png
These results as well as a re-analysis of the 2007 and 2008 observations with the 3-P model are given at
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great work all.

Cheers, Petr [2010-05-28 09:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Peter Veres could continue in much better conditions last night. Adrian [2010-04-18 09:52, Modra] Message sent to observers

· I am observing this. Hopefully, Iceland's volcano ash that is approching will not interfere too much. Adrian [2010-04-16 19:49, Modra] Message sent to BinAstPhotSurvey conference

· monitoring of 0.25 event done. data sent in. [2010-04-09 10:10, Blue Mountains Obs] Message sent to observers

· observed and captured the 0.25 event. Will continue to monitor event in April. [2010-03-25 23:47, Blue Mountains Obs]

· Extensive observations by Joe with Prompt and Peter and Kamil here, supported by Julian from Leura and Russ from Shed of Science have nailed down the second period:
http://www.asu.cas.cz/~asteroid/01830_10_p1.png
http://www.asu.cas.cz/~asteroid/01830_10_p2.png
http://www.asu.cas.cz/~asteroid/01830_10_p2_nsp.png
http://www.asu.cas.cz/~asteroid/01830_10_porb.png
Cf. with the data from 2008:
http://www.asu.cas.cz/~asteroid/01830_080903_1001_p1.png
http://www.asu.cas.cz/~asteroid/01830_080903_1001_p2.png
http://www.asu.cas.cz/~asteroid/01830_080903_1001_p2_nsp.png
http://www.asu.cas.cz/~asteroid/01830_080903_1001_porb.png

Monitoring events evolution past opposition in the April lunation would be useful, events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 4- 3 13.17 0.253
2010- 4- 4 13.40 0.253
2010- 4- 5 13.64 0.253
2010- 4- 6 13.87 0.253
2010- 4- 7 14.11 0.253
2010- 4- 8 14.34 0.253
2010- 4- 9 14.58 0.253
2010- 4-10 14.81 0.253
2010- 4-11 15.05 0.253
2010- 4-12 15.28 0.253
2010- 4-13 15.52 0.253
2010- 4-14 15.75 0.253
2010- 4-15 15.99 0.253
2010- 4-16 16.22 0.253
2010- 4-17 16.46 0.253
2010- 4-18 16.69 0.253
2010- 4-19 16.93 0.253
2010- 4-20 17.16 0.253
2010- 4-21 17.40 0.253
2010- 4-22 17.63 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2010- 4- 3 1.13 0.757
2010- 4- 4 1.37 0.757
2010- 4- 5 1.60 0.757
2010- 4- 6 1.84 0.757
2010- 4- 7 2.07 0.757
2010- 4- 8 2.31 0.757
2010- 4- 9 2.54 0.757
2010- 4-10 2.78 0.757
2010- 4-11 3.01 0.757
2010- 4-12 3.25 0.757
2010- 4-13 3.48 0.757
2010- 4-14 3.72 0.757
2010- 4-15 3.95 0.757
2010- 4-16 4.19 0.757
2010- 4-17 4.42 0.757
2010- 4-18 4.66 0.757
2010- 4-19 4.89 0.757
2010- 4-20 5.13 0.757
2010- 4-21 5.36 0.757
2010- 4-22 5.60 0.757

Clear Skies, Petr [2010-03-24 12:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 19:57 UT and catching 0.75-phase event. Best wishes, Kamil [2010-03-22 20:27, Ondrejov] Message sent to observers

· Started at about 2:45UT under good conditions.

Russ [2010-03-21 02:46, Shed of Science]

· Observing from 20 UT and catching 0.75-phase event. Peter K. [2010-03-19 22:47, Ondrejov] Message sent to observers

· Observing this one from 22:50 UT. Best wishes, Kamil [2010-03-09 22:51, Ondrejov]

· Good quality observations by Joe with Prompt, by Peter here and by Julian from Leura taken during March 6-8 couldn't be fitted well with P_1 and P_orb components only, so I have looked at a presence of a third period both in the recent observations as well as in data from the first two apparitions of 2007 and 2008. There appears to be a weak but consistent signal with an additional period P_2 of 3.263 h, see following plots:
http://www.asu.cas.cz/~asteroid/01830_080903_1001_p1.png
http://www.asu.cas.cz/~asteroid/01830_080903_1001_p2.png
http://www.asu.cas.cz/~asteroid/01830_080903_1001_p2_nsp.png
http://www.asu.cas.cz/~asteroid/01830_080903_1001_porb.png
http://www.asu.cas.cz/~asteroid/01830_10_p1.png
http://www.asu.cas.cz/~asteroid/01830_10_p2.png
http://www.asu.cas.cz/~asteroid/01830_10_porb.png
More observations with errors of 0.01 mag outside events around the favorable opposition in this month are needed to nail P_2 down. An interpretation of the third period should wait for more data and modeling.

Clear Skies, Petr [2010-03-09 13:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from Prompt last night 0418-0915 UT. Phase .250 event recorded. Will observe again tonight beginning ~0130 to get out-of-event light curve plus a second .250 phase event. Joe [2010-03-07 00:53, Dark Sky & PROMPT] Message sent to observers

· Observed from about 22:30 UT. Peter K. [2010-03-07 00:39, Ondrejov]

· observed from 11UT to 17UT 2010-03-06 . No event captured as expected and P1 was consistent with the previously obtained value. [2010-03-06 22:29, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Began observing from Prompt at 0430 UT 3/5-6/2010 under excellent conditions. Attempting to get predicted phase 0.250 event at 0620 UT. (This event can be observed from Prompt each night for the next 10 days). Joe [2010-03-06 04:51, Dark Sky & PROMPT] Message sent to observers

· Julian has taken two good nights for this binary prior to opposition in the past lunation,
http://www.asu.cas.cz/~asteroid/01830_b0_porb.png
http://www.asu.cas.cz/~asteroid/01830_b0_p1.png
More data are needed to establish the binary in this lunation, best if from stations on different continents for its P_orb of 24.24 h. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 3- 5 6.09 0.250
2010- 3- 6 6.33 0.250
2010- 3- 7 6.57 0.250
2010- 3- 8 6.81 0.250
2010- 3- 9 7.05 0.250
2010- 3-10 7.29 0.250
2010- 3-11 7.53 0.250
2010- 3-12 7.77 0.250
2010- 3-13 8.01 0.250
2010- 3-14 8.25 0.250
2010- 3-15 8.49 0.250
2010- 3-16 8.73 0.250
2010- 3-17 8.97 0.250
2010- 3-18 9.21 0.250
2010- 3-19 9.45 0.250
2010- 3-20 9.69 0.250
2010- 3-21 9.93 0.250
2010- 3-22 10.17 0.250
2010- 3-23 10.41 0.250
2010- 3-24 10.65 0.250
2010- 3-25 10.89 0.250
2010- 3-26 11.13 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 3- 4 17.96 0.750
2010- 3- 5 18.20 0.750
2010- 3- 6 18.44 0.750
2010- 3- 7 18.68 0.750
2010- 3- 8 18.92 0.750
2010- 3- 9 19.16 0.750
2010- 3-10 19.40 0.750
2010- 3-11 19.64 0.750
2010- 3-12 19.88 0.750
2010- 3-13 20.12 0.750
2010- 3-14 20.36 0.750
2010- 3-15 20.60 0.750
2010- 3-16 20.84 0.750
2010- 3-17 21.08 0.750
2010- 3-18 21.32 0.750
2010- 3-19 21.56 0.750
2010- 3-20 21.80 0.750
2010- 3-21 22.04 0.750
2010- 3-22 22.28 0.750
2010- 3-23 22.52 0.750
2010- 3-24 22.76 0.750
2010- 3-25 23.00 0.750
2010- 3-26 23.24 0.750

Clear Skies, Petr [2010-03-02 14:04, Ondrejov] Message sent to observers

· observed on 2009-02-21 and 20 for about 4 hours each night. Started at about 13.5 UT. [2010-02-22 10:35, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Done in 2nd apparition. Note added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-11-12 13:34, Ondrejov]

· Observing this one from 17:40 UT trying to catch the 0.25 event, but under bad weather conditions. Best wishes, Kamil [2008-11-06 17:41, Ondrejov] Message sent to observers

· Observing this one from 17:45 UT trying to catch the 0.25 event. Best wishes, Kamil [2008-11-05 17:49, Ondrejov]

· Observing from 18:50 UT and trying to catch the 0.25 event, however some clouds are interfering. Jozef, Leos. [2008-11-03 19:21, Modra]

· Observed 2008-1-09 in good conditions. I believe I have caught all of the event at phase 0.25 (a rather large deviation). Data sent to Petr. [2008-10-09 20:44, HuntersHill] Message sent to observers

· Kamil has covered a part of the secondary event on Oct. 5.0, see the second plot below. It appears that the geometry is partial now, so we cannot nail down D_2/D_1 (for which we have the lower limit of 0.32 from the 2007 data). It will be good to further monitor the events (and taking some data outside events, too, so that changes in the primary lightcurve component are described); they may evolve towards or away from central events geometry, so the additional data should be interesting. Ephemeris below.
http://www.asu.cas.cz/~asteroid/01830_08a_porb.png
http://www.asu.cas.cz/~asteroid/01830_08b_porb.png

Date/Time UTC (LTc.) Phase
--------------------------
2008-10- 6 12.91 0.250
2008-10- 7 13.15 0.250
2008-10- 8 13.39 0.250
2008-10- 9 13.63 0.250
2008-10-10 13.87 0.250
2008-10-18 15.79 0.250
2008-10-19 16.03 0.250
2008-10-20 16.27 0.250
2008-10-21 16.51 0.250
2008-10-22 16.75 0.250
2008-10-23 16.99 0.250
2008-10-24 17.23 0.250
2008-10-25 17.47 0.250
2008-10-26 17.71 0.250
2008-10-27 17.95 0.250
2008-10-28 18.19 0.250
2008-10-29 18.43 0.250
2008-10-30 18.67 0.250
2008-10-31 18.91 0.250
2008-11- 1 19.15 0.250
2008-11- 2 19.39 0.250
2008-11- 3 19.63 0.250
2008-11- 4 19.87 0.250
2008-11- 5 20.11 0.250
2008-11- 6 20.35 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2008-10- 7 1.01 0.750
2008-10- 8 1.25 0.750
2008-10- 9 1.49 0.750
2008-10-10 1.73 0.750
2008-10-18 3.65 0.750
2008-10-19 3.89 0.750
2008-10-20 4.13 0.750
2008-10-21 4.37 0.750
2008-10-22 4.61 0.750
2008-10-23 4.85 0.750
2008-10-24 5.09 0.750
2008-10-25 5.33 0.750
2008-10-26 5.57 0.750
2008-10-27 5.81 0.750
2008-10-28 6.05 0.750
2008-10-29 6.29 0.750
2008-10-30 6.53 0.750
2008-10-31 6.77 0.750
2008-11- 1 7.01 0.750
2008-11- 2 7.25 0.750
2008-11- 3 7.49 0.750
2008-11- 4 7.73 0.750
2008-11- 5 7.97 0.750
2008-11- 6 8.21 0.750

Clear Skies, Petr [2008-10-06 09:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· I am observing this one from 21 UT trying to cover 0.25-event. Best wishes, Kamil [2008-10-04 21:25, Ondrejov] Message sent to observers

· Three nights Sept. 28, 30, and Oct. 1 by David from Hunters Hill: he covered parts of the 0.75-phase event on the first two nights and the full event on Oct. 1. The event shape's changes are correlated with solar phase; a working hypothesis is that it is a primary event with a visible part of its shadow varying with solar phase. They will be very useful data for future detailed modeling.
http://www.asu.cas.cz/~asteroid/01830_08_p1.png
http://www.asu.cas.cz/~asteroid/01830_08_porb.png

While further monitoring of the 0.75-event could be still useful (we may expect it deepens more during following days), it is very important to get data for the 0.25-phase event. If it is a secondary event, it could constrain the size ratio; Higgins et al. (2007) have estimated only the lower limit on D_2/D_1 of 0.32. Unfortunately, European stations have been either clouded out or busy with other targets (e.g., 2000 DP107) recently. Please give it a high priority during following seven days or so before the Moon disturbs.

Clear Skies, Petr [2008-10-02 08:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-09-30 and 2008-10-01. Caught the last part of the 0.75 event on the 30th and the full 0.75 event on the 1st. Data sent to Petr. [2008-10-01 21:55, HuntersHill] Message sent to observers

· Franck Marchis and B. Macomber have observed it with the Lick 1m on Sept. 25, covered most of the 0.75-phase event. A further evolution of the event's shape in just 4 days, since Sept. 21:
http://www.asu.cas.cz/~asteroid/01830_08_p1.png
http://www.asu.cas.cz/~asteroid/01830_08_porb.png

More data for both events every few days would be good to see how it develops; ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2008- 9-30 23.35 0.245
2008-10- 1 23.59 0.245
2008-10- 2 23.83 0.245
2008-10- 4 0.07 0.245
2008-10- 5 0.31 0.245
2008-10- 6 0.55 0.245
2008-10- 7 0.79 0.245
2008-10- 8 1.03 0.245
2008-10- 9 1.27 0.245
2008-10-10 1.51 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2008- 9-30 11.22 0.745
2008-10- 1 11.46 0.745
2008-10- 2 11.70 0.745
2008-10- 3 11.94 0.745
2008-10- 4 12.18 0.745
2008-10- 5 12.42 0.745
2008-10- 6 12.66 0.745
2008-10- 7 12.90 0.745
2008-10- 8 13.14 0.745
2008-10- 9 13.38 0.745
2008-10-10 13.62 0.745

Cheers, Petr [2008-09-30 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008 09 28 from 11:36UT to 17:43UT in good conditions. A late start due to wind but if I'm lucky I might have covered at least part of phase 0.750 [2008-09-28 22:51, HuntersHill] Message sent to observers

· Bob Stephens have observed it from GMARS on two nights past weekend, covered the 0.75-phase event well. The data are consistent with a lower limit on D_2/D_1 of 0.32 estimated from 2007 data (Higgins et al. 2007), but they don't nail it down so far. There is apparent an evolution of the event in seven days from Sept. 13 to 20. It will be good to monitor it by taking one or two more sessions a week from now, before the end of September.
http://www.asu.cas.cz/~asteroid/01830_08_p1.png
http://www.asu.cas.cz/~asteroid/01830_08_porb.png

Clear Skies, Petr [2008-09-22 08:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will be observing from GMARS tonight starting about 5:00 UT. [2008-09-20 02:41, Santana] Message sent to observers

· Gianluca Masi has got data from two shorter sessions taken with 1.5m telescope from Chile on Sept. 11 and 13. He has captured an event:
http://www.asu.cas.cz/~asteroid/01830_08_p1.png
http://www.asu.cas.cz/~asteroid/01830_08_porb.png
One more coverage of the 0.75-phase event and two sessions covering a 0.25-phase event are needed. The 0.25-phase events will occur for Europe, while the 0.75-phase event will be well placed for America-Australia:

Date/Time UTC (LTc.) Phase
--------------------------
2008- 9-18 20.59 0.250
2008- 9-19 20.83 0.250
2008- 9-20 21.07 0.250
2008- 9-21 21.31 0.250
2008- 9-22 21.55 0.250
2008- 9-23 21.79 0.250
2008- 9-24 22.03 0.250
2008- 9-25 22.27 0.250
2008- 9-26 22.51 0.250
2008- 9-27 22.75 0.250
2008- 9-28 22.99 0.250
2008- 9-29 23.23 0.250
2008- 9-30 23.47 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2008- 9-19 8.62 0.747
2008- 9-20 8.86 0.747
2008- 9-21 9.10 0.747
2008- 9-22 9.34 0.747
2008- 9-23 9.58 0.747
2008- 9-24 9.82 0.747
2008- 9-25 10.06 0.747
2008- 9-26 10.30 0.747
2008- 9-27 10.54 0.747
2008- 9-28 10.78 0.747
2008- 9-29 11.02 0.747
2008- 9-30 11.26 0.747

Clear Skies, Petr [2008-09-18 07:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Michal and Marek have observed the returning binary from Skalnate Pleso on four nights 2008 Sept. 3.0 to 6.9. A very good definition of the primary lightcurve component, but no mutual events captured by the observations that covered 30% of the system's orbital period:
http://www.asu.cas.cz/~asteroid/01830_08_p1.png
http://www.asu.cas.cz/~asteroid/01830_08_porb.png
It will be needed to get a more complete coverage of the orbital period in the upcoming lunation so that to cover events (if they occur) or to show that we see the asteroid outside events geometry now. With the system's P_orb of 24.24 h, we need a help by stations in America and Australia. A couple good nights from the other continents might suffice.

Clear Skies, Petr [2008-09-15 09:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:20 UT in good coditions. Palo. [2008-09-08 22:40, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 20:30 UT in average conditions. Michal [2008-09-06 20:56, SkalnatePleso] [Remove]

· Observing from 20:00 UT in average conditions. Michal [2008-09-05 21:14, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 22:10 UT in average conditions. Michal [2008-09-04 22:23, SkalnatePleso] [Remove]

· Observing from 20:00 UT in good conditions. Michal [2008-09-02 20:03, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· The binary is closed for the discovery lunation. [2007-07-31 12:57, Ondrejov]

· Observed 2007-07-19 from 08:13UT to 12:56UT in good conditions. Target is becoming too faint to observe from E14 as indicated by 0.02-0.03mag error bars. Data sent to Petr. [2007-07-19 22:36, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 07:58UT to 13:10UT 07/14 in good condition. It looks like a low amplitude secondary (~0.06m)event.Data sent in. [2007-07-14 22:27, Blue Mountains Obs]

· Observed 2007-07-10 from 10:32UT to 13:17UT in good conditions (after the clouds cleared) No deviations detected in the plot and the shape fits the existing plot nicely. Data sent to Petr. [2007-07-10 22:14, HuntersHill] Message sent to BinAstPhotSurvey conference

· David's June6 data have nailed down the primary lightcurve and they covered the secondary event more.
http://www.asu.cas.cz/~asteroid/01830_shortpc_c.png
http://www.asu.cas.cz/~asteroid/01830_longpc_c.png
More observations during this lunation are not encouraged as the system's geometry doesn't appear to change fast. If Julian or David could take a few more sessions in the July lunation when the primary events will move into their nightly observing window, it would be useful for future modeling of the system.

Cheers, Petr [2007-06-07 08:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-06-06 from 08:08UT to 15:32UT in excellent conditions. Data sent to Petr and Peter. [2007-06-06 22:08, HuntersHill]

· New data joined in:
2007-06-03.5 by Julian (they combine suitably with the longer but more sparse session by David from the same night)
2007-06-04.4 by David.
http://www.asu.cas.cz/~asteroid/01830_longpc_c.png
The secondary event is much better covered now. It still doesn't have a flat bottom, the geometry is non-central and a direct precise estimation of Ds/Dp is still not possible. Ok, the secondary event has been covered well enough for now, no more data are needed for the event during next seven days or so. It would be good, however, to cover phases outside the event once more, to check a shape of the primary lightcurve. David or Julian, can you take such data in good conditions?

Cheers, Petr [2007-06-04 14:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-06-04 from 08:01UT to 12:09UT. Session cut short by heavy cloud. Data looks OK and sent to Petr. [2007-06-04 14:04, HuntersHill]

· Observation done from 08:00UT to 13:00UT for the purpose of catching the secondary event in good condition. Attention was then shifted to 5477for the rest of the night. [2007-06-04 10:21, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· The David's data of June 3 are usable, despite the somewhat problematic conditions. The secondary event was covered, it has broadened, consistent with the asteroid's increasing solar phase, though it may be in part also due to an aspect change. A second full night in good conditions is needed to describe the shape of the event (especially its bottom) as well as a lightcurve of the primary component outside the event (that may have evolved slightly) well.
http://www.asu.cas.cz/~asteroid/01830_all.png
http://www.asu.cas.cz/~asteroid/01830_longpc.png
http://www.asu.cas.cz/~asteroid/01830_shortpc.png

Cheers, Petr [2007-06-04 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-06-03 from 08:28UT to 15:32UT. Lost the first hour due to the target passing over a bright field star. Not the greatest of conditions (moon, wind, cloud) but data seems OK. Sent to Petr. [2007-06-03 23:47, HuntersHill] Message sent to BinAstPhotSurvey conference

· Ephemeris for the secondary events, observable from the Australian stations:

Date/Time UTC (LTc.) Phase
--------------------------
2007- 6- 4 10.98 0.750
2007- 6- 5 11.22 0.750
2007- 6- 6 11.46 0.750
2007- 6- 7 11.70 0.750
2007- 6- 8 11.94 0.750
2007- 6- 9 12.18 0.750
2007- 6-10 12.42 0.750
2007- 6-11 12.66 0.750
2007- 6-12 12.90 0.750
2007- 6-13 13.14 0.750
2007- 6-14 13.38 0.750
2007- 6-15 13.62 0.750

Petr [2007-05-29 09:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data:
2007 May 16.3 and 17.2 by Vishnu and Ron from Badlands
2007 May 17.2 by Russ from Shed of Science Observatory
2007 May 23.9 by Kamil and Peter from here
2007 May 24.9 by Michal and Marek from Skalnate Pleso.
Peter and Kamil have also calibrated all the four Ondrejov R nights.
Current solution:
http://www.asu.cas.cz/~asteroid/01830_all.png
http://www.asu.cas.cz/~asteroid/01830_longpc.png
http://www.asu.cas.cz/~asteroid/01830_shortpc.png
Long period component with the recent data:
http://www.asu.cas.cz/~asteroid/01830_longpc_b.png
The calibrated data gave H_R=12.17 (error <0.1).

The most needed data covering the secondary event of May 16 and 17 are not of an entirely ideal coverage, but they suggest that we may be indeed moving towards more central events. If so, there may occur a flat bottom soon. Tonight May 26 there will occur the secondary event around 9:00 UT, so if someone can get good data despite the approaching Moon, do it. Otherwise, the secondary event will be well observable from the Australian stations after the Full Moon, so it should be an opportunity to estimate Ds/Dp precisely.

Clear Skies, Petr [2007-05-25 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:35 UT in good conditions. Michal [2007-05-24 23:38, SkalnatePleso] [Remove]

· Observing from 19:35 UT in good conditions. Michal [2007-05-24 20:08, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Hi guys, I will be observing (1830) from 20:30 up to 23:30 UT and then I will try to get additional short run for (4555). Kamil [2007-05-23 18:55, Ondrejov]

· Startet run around 4UT. Should be able to cover the 6.66UT event.

Russ [2007-05-17 04:14, Shed of Science] Message sent to BinAstPhotSurvey conference

· We started this ~ 4.5 UT under marginal cloud conditions. Hopefully we will be able to cover the event at 6.42 UTC.

Ron & Vishnu [2007-05-16 05:01, Vishnu Reddy/Tucson]

· Though taking more data for the new suspect (6949) is the highest priority now, please don't forget the two other follow-up binaries, (1830) Pogson and (5477) 1989 UH2. For (1830), covering the secondary events twice during the next ten days would be useful to see whether the geometry is moving towards more central events (that would allow us to estimate Ds/Dp precisely). An ephemeris for the events is enclosed below, they occur in the window for US stations. The other binary (5477) can be worked from southern hemisphere stations only, so I encourage Julian and David to target it.

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 5-16 6.42 0.750
2007- 5-17 6.66 0.750
2007- 5-18 6.90 0.750
2007- 5-19 7.14 0.750
2007- 5-20 7.38 0.750
2007- 5-21 7.62 0.750
2007- 5-22 7.86 0.750
2007- 5-23 8.10 0.750
2007- 5-24 8.34 0.750
2007- 5-25 8.58 0.750 [2007-05-15 09:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don's data of the past night covering the secondary event show that it is changing on a daily basis (should be related to actual rotation phase of the primary, if/when its shape can be modeled to sufficient details in future), with no flat bottom:
http://www.asu.cas.cz/~asteroid/01830_all.png
http://www.asu.cas.cz/~asteroid/01830_longpc.png
http://www.asu.cas.cz/~asteroid/01830_shortpc.png
It is the same behaviour we have seen in the April lunation, and it indicates a non-central geometry. Only a lower limit on Ds/Dp can be therefore obtained. Current solution:
Pprim= 2.5702 +/-0.0001 h
Porb= 24.240 +/-0.005 h
Depth of the events: 0.08-0.22 mag
Ds/Dp >= 0.32
Aprim = 0.12 mag

The discovery phase is over now. We should monitor changes of the events' shapes later during this lunation. If the geometry moves to more central and total secondary events occur, then we will establish Ds/Dp precisely.

I will circulate a draft announcement for CBET shortly.

Cheers, Petr [2007-05-09 15:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our report on the binary has appeared on CBET 957 a few minutes ago. I am going to add a note on it to our web pages.

Cheers, Petr

(1830) POGSON
D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak, Ondrejov
Observatory; J. Oey, Leura, N.S.W., Australia; and D. Pray, Carbuncle Hill
Observatory, Greene, RI, report that photometric observations obtained
during Apr. 18 to May 9 reveal that minor planet (1830) is a binary system
with an orbital period of 24.240 ± 0.005 hr. The primary shows a period
of 2.5702 ± 0.0001 hr, and it has a lightcurve amplitude of 0.12 mag.
Mutual eclipse/occultation events that are 0.08- to 0.22-mag deep indicate
a lower limit on the secondary-to-primary mean-diameter ratio of 0.32.

(C) Copyright 2007 CBAT
2007 May 10 (CBET 957) Daniel W. E. Green [2007-05-10 14:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don has covered the secondary event on May 7.2, see
http://www.asu.cas.cz/~asteroid/01830_all.png
http://www.asu.cas.cz/~asteroid/01830_longpc.png
http://www.asu.cas.cz/~asteroid/01830_shortpc.png
He has been taking another data on the past night, so we wait for them to see how the event's shape evolves now before deciding how to go on with this one.

Cheers, Petr [2007-05-09 09:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this around 02:00 ut in very good conditions. I should catch the secondary event again.
Don [2007-05-09 02:02, CarbuncleHill]

· New data from 4 nights were joined in:

May 3.6, 4.6 and 5.6 from Leura Obs.,
May 5.6 from Hunters Hill Obs.

New data fit well with data taken in previous lunation and refined both periods to P_1 = 2.5704 h and P_orb = 24.24 h.

http://www.asu.cas.cz/~asteroid/01830_all.png
http://www.asu.cas.cz/~asteroid/01830_longpc.png
http://www.asu.cas.cz/~asteroid/01830_shortpc.png

The primary event as well as P_prim outside events is covered enough now:

http://www.asu.cas.cz/~asteroid/01830_longpc_may.png
http://www.asu.cas.cz/~asteroid/01830_shortpc_may.png

What we need now are observations of secondary event from this lunation. Don Pray has started last night... Good luck!

Good work, Julian and David!

Peter K. [2007-05-07 11:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 02:05 UT, and should catch the secondary event.
Don [2007-05-07 02:14, CarbuncleHill]

· 2 more nights were done with 0.24 phase captured. 09:33UT to 16:13UT on 05/05 and 09:21 to 19:00 UT on 04/05 in relatively good condition. I will attempt 6615 Plutarchos tonight if conditions remain good. Data sent in. [2007-05-06 03:39, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed 2007.05.05 from 09:22UT to 18:06UT in relatively poor conditions. Data has been sent to Petr. [2007-05-06 01:40, HuntersHill]

· Observed from 10:16 UT TO 17:04 UT , with the moon some 25 deg away but good condition making this data useful. secondary event captured near end of run. Data sent in. [2007-05-03 23:45, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· To finish the discovery phase for this one, we need to get one more coverage of the secondary event, plus twice P_prim outside events. The secondary event will be well observable from US stations in a few days. We will announce it on a circular when this is completed.

Clear Skies, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 5- 7 3.63 0.740
2007- 5- 8 3.83 0.740
2007- 5- 9 4.03 0.740
2007- 5-10 4.23 0.740
2007- 5-11 4.43 0.740
2007- 5-12 4.63 0.740
2007- 5-13 4.83 0.740
2007- 5-14 5.03 0.740
2007- 5-15 5.23 0.740
2007- 5-16 5.43 0.740
2007- 5-17 5.63 0.740
2007- 5-18 5.83 0.740
2007- 5-19 6.03 0.740
2007- 5-20 6.23 0.740

Date/Time UTC (LTc.) Phase
--------------------------
2007- 5- 6 15.52 0.240
2007- 5- 7 15.72 0.240
2007- 5- 8 15.92 0.240
2007- 5- 9 16.12 0.240
2007- 5-10 16.32 0.240
2007- 5-11 16.52 0.240
2007- 5-12 16.72 0.240
2007- 5-13 16.92 0.240
2007- 5-14 17.12 0.240
2007- 5-15 17.32 0.240
2007- 5-16 17.52 0.240
2007- 5-17 17.72 0.240
2007- 5-18 17.92 0.240
2007- 5-19 18.12 0.240
2007- 5-20 18.32 0.240 [2007-05-03 09:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Nice work, David and Peter on this one. Yes, both periods are unique now:
P_1 = 2.568 +/-0.001 h
P_orb= 24.2 (error <0.1 h)
http://www.asu.cas.cz/~asteroid/01830_all.png
http://www.asu.cas.cz/~asteroid/01830_longpc.png
http://www.asu.cas.cz/~asteroid/01830_shortpc.png
David was getting primary events while Peter was getting secondary events all the time. The secondary events don't have a flat bottom, and shapes of bottoms of both events change fast; it indicates that the events are non-central. Thus we get only a lower limit on Ds/Dp of 0.33 now. If its geometry is moving towards more central events, we will refine the Ds/Dp estimate with more observations later during this apparition (next lunations). For now, the coverage of both events is sufficient. Very useful would be if an US station could get one good session (min. duration 2.6 hours = the primary period) outside events that would improve coverage. We are just one such session away from announcing this one on a CBET.

Cheers, Petr [2007-04-23 12:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for almost 3 hours again. New data were joined in: Apr 21.5 by David and Apr 22.0 by me. There are events in both short sessions, consistent with P_orb=24.25 h. What we need now are observations also outside events to improve coverage of short-period component. Pictures were updated. Peter K. [2007-04-22 02:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:16UT to 13:13UT in poor conditions. Took advantage of a break in clouds. Now I'm socked in. I think I got an event but it appears to be shallowing.

Data sent to Petr and Peter. [2007-04-21 14:25, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed for 2.4 hours last night and caught another event. Seems to be different from David's one. P_orb is preliminary near 24 hours -- see Petr's updated pictures bellow.

It would be great if someone from US can extend my run and observe as long as possible. Good luck! Peter K. [2007-04-21 05:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:42UT to 17:07UT in good conditions. Heavy fog rolling in a little after the target set. I think tonights data may have revealed another minima, it's shape appears very different to the first 2 nights. Data sent to Petr and Peter. [2007-04-21 02:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· The two David's nights reveal that this one is a serious binary suspect. Neither of the two periods has been uniquely established yet, following periods are possible:
P_1 = 2.565 or 2.435 h, see
http://www.asu.cas.cz/~asteroid/01830_nsp.png
P_orb= 16.24, 24.4, or 48.8 h

In following plots, the data are folded with a longer period of 16.24/2 = 8.12 h, to show similar shapes of the two attenuations:
http://www.asu.cas.cz/~asteroid/01830_all.png
http://www.asu.cas.cz/~asteroid/01830_longpc.png
http://www.asu.cas.cz/~asteroid/01830_shortpc.png

I encourage all to observe the serious binary suspect so that the solution is nailed down.

Cheers, Petr [2007-04-20 09:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:45UT to 19:24UT in good conditions after cloud cleared. Target has the oddest lightcurve I have ever seen. There is a minima that has repeated each night but the rest looks flat but noisy (0.1mag noisy) with no obvious maxima or second minima with a period of 8.13 +/- 0.02 hrs and an amplitude of 0.25 +/- 0.01mag. [2007-04-19 22:06, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:51UT to 17:51UT in odd conditions leading a weather front (temp rose during the night then fell sharply when the cloud front arrived).

Target revealed very noisy data that was almost flat for the entire session except for a 1 hour long 'sharp' dip an starting an hour after session start (did not coincide with the only star subtraction made and cloud came later) [2007-04-18 21:53, HuntersHill] Message sent to BinAstPhotSurvey conference

(7343) Ockeghem - Returning paired asteroid [Add new note]
[Send data to: peter@asu.cas.cz ]
· I have one isolated clear night. So I will try to get a run on this object for this lunation.

Russ [2024-02-13 01:23, Shed of Science] Message sent to observers

· Started this one on Jan 15.
Don [2024-01-16 01:29, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for this apparition. Petr [2021-03-11 09:53, Ondrejov]

· I took 2 sessions on this on Mar 8 and 10.
Don [2021-03-10 20:37, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for this apparition. Petr [2019-10-07 12:09, Ondrejov]

· I did a second run on this Sep 21.
Don [2019-09-22 01:09, Sugarloaf] Message sent to observers

· Starting this at 01:55 UT.
Don [2019-09-20 01:34, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for this apparition. Petr [2016-12-28 13:48, Ondrejov]

· Started a run at 22:45, Dec 25 UT, and will observe until 03:00, Dec 26.

Don [2016-12-26 01:08, Sugarloaf] Message sent to observers

· Started this at 01:00 UT.
DOn [2016-10-26 01:29, Sugarloaf]

· Did a run on this returning paired asteroid on Sep 23 UT.
Don [2016-09-24 18:25, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray observed it on five nights in this lunation:
http://www.asu.cas.cz/~asteroid/007343_201401.png
http://www.asu.cas.cz/~asteroid/007343_201311.png

Taking one last session (one period sufficient) in the next lunation will be useful for future spin&shape modeling.

Clear Skies, Petr [2014-01-10 08:49, Ondrejov]

· Started a run at 23:50, Jan 7 UT.
Don [2014-01-08 03:39, Sugarloaf] Message sent to observers

· Started a run at 23:50, Jan 4 UT.
Don [2014-01-05 00:22, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Cancelling 3073 and doing this one instead.
Don [2014-01-04 03:22, Sugarloaf]

· Don Pray observed this return paired asteroid from Sugarloaf Mountain recently:
http://www.asu.cas.cz/~asteroid/007343_b3.png
This is sufficient data for this lunation.

Cheers, Petr [2013-12-02 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed at Abastumani on Nov 23/24. [2013-12-02 09:15, Kharkiv] Message sent to observers

· Started a run at 02:45 UT.
Don [2013-11-30 02:36, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This primary of the asteroid pair 7343-154634, also a "prime suspect" for being a binary, has been worked well for this apparition. We have received following data: 4 nights from Modra, 1 night from Skalnate Pleso and 1 night from SRO. Current solution:
http://www.asu.cas.cz/~asteroid/007343_b1.png
More data have been announced here in the binast-webtool, they will be joined in when they come. No more observations are needed for now.

Cheers, Petr [2011-02-28 14:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work later tonight from SRO. -Walt [2011-02-28 03:23, Sonoita] Message sent to observers

· Observing from 17:20 UT in good conditions. Michal [2011-02-27 20:45, SkalnatePleso] [Remove]

· Working from SRO tonight. -Walt [2011-02-25 02:52, Sonoita] Message sent to observers

· Object observing from 22:20 UT. Gabo [2011-02-24 21:54, SkalnatePleso] [Remove]

· Observed 23/24.2. 19:00-2:30 UT, data fit in well with our january observations. Jozef, Leos. [2011-02-24 11:31, Modra]

· Began observing from T1M at Pic du Midi 02/01 at 22 UT until 5 UT
we observed the previous night, but rapidly the fog came... [2011-02-02 23:38, Pic du Midi] Message sent to BinAstPhotSurvey conference

· Observing from 23:05 UT in good conditions. Michal [2011-02-01 23:08, SkalnatePleso] [Remove]
Message sent to observers

· Began observing from T1M at Pic du Midi 02/01 at 22 UT until 5 UT
we observed the previous night, but rapidly the fog came... [2011-02-01 23:05, Pic du Midi] Message sent to BinAstPhotSurvey conference

· Began observing from Prompt 02/01 at 0245 UT under good conditions but high wind interrupted at 0450 UT. Joe [2011-02-01 16:29, Dark Sky & PROMPT] Message sent to observers

· Interrupted at ~23UT. Jozef [2011-01-31 01:34, Modra]

· Another try tonight, starting ... surrounded by fog. Jozef [2011-01-30 20:32, Modra]

· Weather did not hold, so anyone can take over now. Jozef, Stefan. [2011-01-29 20:39, Modra]

· Planning this one tonight, if weather permits. Jozef, Stefan. [2011-01-29 16:17, Modra]

· Observing it from 20:24 UT on Jan.28, 2011.

Stefan/Jozef [2011-01-28 22:42, Modra] Message sent to BinAstPhotSurvey conference

· Observed it on Jan. 27/28, 2011.

Jozef/Stefan [2011-01-28 15:45, Modra]

(11548) Jerrylewis [Add new note]
[Send data to: peter@asu.cas.cz ]
· Completed a few nights on this object and sent the data to Petr.

Russ [2024-01-19 01:07, Shed of Science] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/11548.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-12-17 15:08, Ondrejov] Message sent to BinAstPhotSurvey conference

(347) Pariana - suspect, confirmation needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· I did a few nights on this object and sent the data to Petr. No deviations seen.

Russ [2024-01-19 01:05, Shed of Science] Message sent to observers

· Jesus Delgado (obs. station Z73; not a member of this our group) has contacted me about his recent observations of (347) Pariana. In a few of his 12 sessions for this object, there are present suspect deviations that might be attenuations in a binary system. See following very tentative lc decompositions of the three blocks of his data:
https://www.asu.cas.cz/~asteroid/00347_2023a_p1.png
https://www.asu.cas.cz/~asteroid/00347_2023a_p2.png
https://www.asu.cas.cz/~asteroid/00347_2023b_p1.png
https://www.asu.cas.cz/~asteroid/00347_2023b_p2.png
https://www.asu.cas.cz/~asteroid/00347_2023c_p1.png
https://www.asu.cas.cz/~asteroid/00347_2023c_p2.png

More thorough high-quality data (errors 0.01 mag) are needed to confirm. Jesus cannot take such high quality data for the object in this month and he would appreciate a help by observers from this our group.

Clear Skies, Petr [2024-01-02 12:15, Ondrejov] Message sent to BinAstPhotSurvey conference

(347) Pariana - suspect, confirmation needed	[Add new note] [Send data to: peter@asu.cas.cz ]
·	I did a few nights on this object and sent the data to Petr. No deviations seen. Russ [2024-01-19 01:05, Shed of Science]

·	Jesus Delgado (obs. station Z73; not a member of this our group) has contacted me about his recent observations of (347) Pariana. In a few of his 12 sessions for this object, there are present suspect deviations that might be attenuations in a binary system. See following very tentative lc decompositions of the three blocks of his data: https://www.asu.cas.cz/~asteroid/00347_2023a_p1.png https://www.asu.cas.cz/~asteroid/00347_2023a_p2.png https://www.asu.cas.cz/~asteroid/00347_2023b_p1.png https://www.asu.cas.cz/~asteroid/00347_2023b_p2.png https://www.asu.cas.cz/~asteroid/00347_2023c_p1.png https://www.asu.cas.cz/~asteroid/00347_2023c_p2.png More thorough high-quality data (errors 0.01 mag) are needed to confirm. Jesus cannot take such high quality data for the object in this month and he would appreciate a help by observers from this our group. Clear Skies, Petr [2024-01-02 12:15, Ondrejov]

(82256) 2001 KM8 (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5331, copied below for your convenience.

Cheers, Petr

(82256) 2001 KM_8
V. Benishek, Belgrade Astronomical Observatory; and P. Pravec, Ondrejov
Observatory, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia during 2023 Nov. 7-2024 Jan. 4
reveal that minor planet (82256) is a binary system with an orbital period of
43.17 Â± 0.06 hr. The primary shows a period of 3.0362 Â± 0.0003 hr and
has a lightcurve amplitude of 0.37 mag at solar phases 4-11 degrees. Mutual
eclipse/occultation events that are 0.08 magnitude deep indicate a lower
limit on the secondary-to-primary mean-diameter ratio of 0.28.

2021 January 15 (CBET 5331) Daniel W. E. Green [2024-01-16 07:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has taken more data for this one from Sopot. The orbit period is 43.17 h or half that; the lc decomposition for the longer one:
https://www.asu.cas.cz/~asteroid/82256_2023a_porb.png
https://www.asu.cas.cz/~asteroid/82256_2023a_p1.png
https://www.asu.cas.cz/~asteroid/82256_2023b_porb.png
https://www.asu.cas.cz/~asteroid/82256_2023b_p1.png

More data (errors < 0.02 mag) are needed to resolve the P_orb ambiguity. Below is an event ephemeris for the 21.585-h period. For the 43.17-h orbit period, only the 0.25-phase events will occur, so it is particularly critical to cover some of the predicted times of the 0.75-phase ones.

Date/Time UTC (LTc.) Phase
--------------------------
2023-12-30 13.13 0.250
2023-12-31 10.71 0.250
2024- 1- 1 8.30 0.250
2024- 1- 2 5.88 0.250
2024- 1- 3 3.47 0.250
2024- 1- 4 1.05 0.250
2024- 1- 4 22.64 0.250
2024- 1- 5 20.22 0.250
2024- 1- 6 17.81 0.250
2024- 1- 7 15.39 0.250
2024- 1- 8 12.98 0.250
2024- 1- 9 10.56 0.250
2024- 1-10 8.15 0.250
2024- 1-11 5.73 0.250
2024- 1-12 3.32 0.250
2024- 1-13 0.90 0.250
2024- 1-13 22.49 0.250
2024- 1-14 20.07 0.250
2024- 1-15 17.66 0.250
2024- 1-16 15.24 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2023-12-30 2.32 0.750
2023-12-30 23.91 0.750
2023-12-31 21.49 0.750
2024- 1- 1 19.08 0.750
2024- 1- 2 16.66 0.750
2024- 1- 3 14.25 0.750
2024- 1- 4 11.83 0.750
2024- 1- 5 9.42 0.750
2024- 1- 6 7.00 0.750
2024- 1- 7 4.59 0.750
2024- 1- 8 2.17 0.750
2024- 1- 8 23.76 0.750
2024- 1- 9 21.34 0.750
2024- 1-10 18.93 0.750
2024- 1-11 16.51 0.750
2024- 1-12 14.10 0.750
2024- 1-13 11.68 0.750
2024- 1-14 9.27 0.750
2024- 1-15 6.85 0.750
2024- 1-16 4.44 0.750

Clear Skies, Petr [2023-12-20 08:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/82256_2023a_porb.png
https://www.asu.cas.cz/~asteroid/82256_2023a_p1.png

More data (with errors not greater than 0.015 mag) are needed to establish it well.

Clear Skies, Petr [2023-11-23 10:21, Ondrejov] Message sent to BinAstPhotSurvey conference

(82256) 2001 KM8 (Finished) - binary	[Add new note]
·	Our report on this one has appeared on CBET 5331, copied below for your convenience. Cheers, Petr (82256) 2001 KM_8 V. Benishek, Belgrade Astronomical Observatory; and P. Pravec, Ondrejov Observatory, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia during 2023 Nov. 7-2024 Jan. 4 reveal that minor planet (82256) is a binary system with an orbital period of 43.17 Â± 0.06 hr. The primary shows a period of 3.0362 Â± 0.0003 hr and has a lightcurve amplitude of 0.37 mag at solar phases 4-11 degrees. Mutual eclipse/occultation events that are 0.08 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.28. 2021 January 15 (CBET 5331) Daniel W. E. Green [2024-01-16 07:55, Ondrejov]

·	Vladimir Benishek has taken more data for this one from Sopot. The orbit period is 43.17 h or half that; the lc decomposition for the longer one: https://www.asu.cas.cz/~asteroid/82256_2023a_porb.png https://www.asu.cas.cz/~asteroid/82256_2023a_p1.png https://www.asu.cas.cz/~asteroid/82256_2023b_porb.png https://www.asu.cas.cz/~asteroid/82256_2023b_p1.png More data (errors < 0.02 mag) are needed to resolve the P_orb ambiguity. Below is an event ephemeris for the 21.585-h period. For the 43.17-h orbit period, only the 0.25-phase events will occur, so it is particularly critical to cover some of the predicted times of the 0.75-phase ones. Date/Time UTC (LTc.) Phase -------------------------- 2023-12-30 13.13 0.250 2023-12-31 10.71 0.250 2024- 1- 1 8.30 0.250 2024- 1- 2 5.88 0.250 2024- 1- 3 3.47 0.250 2024- 1- 4 1.05 0.250 2024- 1- 4 22.64 0.250 2024- 1- 5 20.22 0.250 2024- 1- 6 17.81 0.250 2024- 1- 7 15.39 0.250 2024- 1- 8 12.98 0.250 2024- 1- 9 10.56 0.250 2024- 1-10 8.15 0.250 2024- 1-11 5.73 0.250 2024- 1-12 3.32 0.250 2024- 1-13 0.90 0.250 2024- 1-13 22.49 0.250 2024- 1-14 20.07 0.250 2024- 1-15 17.66 0.250 2024- 1-16 15.24 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2023-12-30 2.32 0.750 2023-12-30 23.91 0.750 2023-12-31 21.49 0.750 2024- 1- 1 19.08 0.750 2024- 1- 2 16.66 0.750 2024- 1- 3 14.25 0.750 2024- 1- 4 11.83 0.750 2024- 1- 5 9.42 0.750 2024- 1- 6 7.00 0.750 2024- 1- 7 4.59 0.750 2024- 1- 8 2.17 0.750 2024- 1- 8 23.76 0.750 2024- 1- 9 21.34 0.750 2024- 1-10 18.93 0.750 2024- 1-11 16.51 0.750 2024- 1-12 14.10 0.750 2024- 1-13 11.68 0.750 2024- 1-14 9.27 0.750 2024- 1-15 6.85 0.750 2024- 1-16 4.44 0.750 Clear Skies, Petr [2023-12-20 08:42, Ondrejov]

·	Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative lc decomposition: https://www.asu.cas.cz/~asteroid/82256_2023a_porb.png https://www.asu.cas.cz/~asteroid/82256_2023a_p1.png More data (with errors not greater than 0.015 mag) are needed to establish it well. Clear Skies, Petr [2023-11-23 10:21, Ondrejov]

(5744) Yorimasa - binary suspect, more data needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· Fred Vachier and coll. have observed this new target from Reunion, found suspect features there. A very tentative lc decomposition (which is obviously not correct for the second period, but I wanted to present it here so that you get an idea on what is seen in the data):
https://www.asu.cas.cz/~asteroid/05744_2023a_p1.png
https://www.asu.cas.cz/~asteroid/05744_2023a_porb.png

More good quality data (errors < 0.02 mag) are needed to establish it.

Clear Skies, Petr [2023-12-16 10:44, Ondrejov] Message sent to BinAstPhotSurvey conference

(5744) Yorimasa - binary suspect, more data needed	[Add new note] [Send data to: peter@asu.cas.cz ]
·	Fred Vachier and coll. have observed this new target from Reunion, found suspect features there. A very tentative lc decomposition (which is obviously not correct for the second period, but I wanted to present it here so that you get an idea on what is seen in the data): https://www.asu.cas.cz/~asteroid/05744_2023a_p1.png https://www.asu.cas.cz/~asteroid/05744_2023a_porb.png More good quality data (errors < 0.02 mag) are needed to establish it. Clear Skies, Petr [2023-12-16 10:44, Ondrejov]

(18301) Konyukhov (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5320, copied below for your convenience.

Cheers, Petr

(18301) KONYUKHOV
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; F. Vachier, Observatoire de Paris; R. Durkee, Shed of Science
South Observatory, Pontotoc, TX, U.S.A.; A. Marchini and R. Papini,
Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of
Siena; and A. Klotz, P. Thierry, and J. Berthier, Observatoire des Makes,
Reunion, report that photometric observations taken with a 0.35-m telescope
at the Sopot Observatory in Serbia, a 0.6-m telescope at the Observatoire des
Makes, a 0.50-m telescope at the Shed of Science South Observatory, and a
0.30-m telescope at the Astronomical Observatory of the University of Siena
during Sept. 28-Nov. 13 reveal that minor planet (18301) is a binary system
with an orbital period of 35.7 Â± 0.1 hr or twice that. The primary shows a
period of 2.67197 Â± 0.00008 hr and has a lightcurve amplitude of 0.16
magnitude at solar phases 3-11 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.07 to 0.14 magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.26 Â± 0.02.

2023 November 27 (CBET 5320) Daniel W. E. Green [2023-11-28 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one give two possible solutions for the orbit period: 35.7 h or twice that. Lc decomposition for the shorter one:
https://www.asu.cas.cz/~asteroid/18301_2023a_porb.png
https://www.asu.cas.cz/~asteroid/18301_2023a_p1.png
Note: The mutual orbit has a non-zero eccentricity, see the primary and secondary event separated by about 0.4 P_orb.

More data (errors not greater than 0.015 mag) are needed to resolve between the two orbit periods. Event ephemeris for the shorter one follows; only some of the events will occur for the longer period, which will discriminate between the two solutions.

Date/Time UTC (LTc.) Phase
--------------------------
2023-11- 2 6.24 0.313
2023-11- 3 17.94 0.313
2023-11- 5 5.64 0.313
2023-11- 6 17.34 0.313
2023-11- 8 5.04 0.313
2023-11- 9 16.74 0.313
2023-11-11 4.44 0.313
2023-11-12 16.14 0.313
2023-11-14 3.84 0.313
2023-11-15 15.54 0.313
2023-11-17 3.24 0.313
2023-11-18 14.94 0.313
2023-11-20 2.64 0.313

Date/Time UTC (LTc.) Phase
--------------------------
2023-11- 1 8.37 0.700
2023-11- 2 20.07 0.700
2023-11- 4 7.77 0.700
2023-11- 5 19.47 0.700
2023-11- 7 7.17 0.700
2023-11- 8 18.87 0.700
2023-11-10 6.57 0.700
2023-11-11 18.27 0.700
2023-11-13 5.97 0.700
2023-11-14 17.67 0.700
2023-11-16 5.37 0.700
2023-11-17 17.07 0.700
2023-11-19 4.77 0.700
2023-11-20 16.47 0.700

Clear Skies, Petr [2023-10-26 10:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data taken for this one by Russ Durkee, Vladimir Benishek, Alessandro Marchini, Riccardo Papini, and Fred Vachier joined in. There are two possible solutions for the orbit period: 35.7 h or twice that. Lc decomposition for the shorter one:
https://www.asu.cas.cz/~asteroid/18301_2023a_porb.png
https://www.asu.cas.cz/~asteroid/18301_2023a_p1.png
Note: The mutual orbit has a non-zero eccentricity, see the primary and secondary event separated by about 0.4 P_orb.

More data (errors < 0.015 mag) are needed to resolve between the two orbit periods. Event ephemeris for the shorter one follows; only some of the events will occur for the longer period, which will discriminate between the two solutions.

Date/Time UTC (LTc.) Phase
--------------------------
2023-10-15 9.47 0.304
2023-10-16 21.17 0.304
2023-10-18 8.87 0.304
2023-10-19 20.57 0.304
2023-10-21 8.27 0.304
2023-10-22 19.97 0.304
2023-10-24 7.67 0.304

Date/Time UTC (LTc.) Phase
--------------------------
2023-10-15 23.68 0.702
2023-10-17 11.38 0.702
2023-10-18 23.08 0.702
2023-10-20 10.78 0.702
2023-10-21 22.48 0.702
2023-10-23 10.18 0.702

Clear Skies, Petr [2023-10-15 08:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a second night on this one.

Russ [2023-10-09 01:43, Shed of Science] Message sent to observers

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary. A tentative lc decomposition (it is far from unique):
https://www.asu.cas.cz/~asteroid/18301_2023a_porb.png
https://www.asu.cas.cz/~asteroid/18301_2023a_p1.png

More data (errors < 0.015 mag) are needed to catch more events and establish its orbit period.

Clear Skies, Petr [2023-10-05 10:50, Ondrejov] Message sent to BinAstPhotSurvey conference

(18301) Konyukhov (Finished) - binary	[Add new note]
·	Our report on this one has appeared on CBET 5320, copied below for your convenience. Cheers, Petr (18301) KONYUKHOV V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; F. Vachier, Observatoire de Paris; R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; A. Marchini and R. Papini, Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of Siena; and A. Klotz, P. Thierry, and J. Berthier, Observatoire des Makes, Reunion, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.6-m telescope at the Observatoire des Makes, a 0.50-m telescope at the Shed of Science South Observatory, and a 0.30-m telescope at the Astronomical Observatory of the University of Siena during Sept. 28-Nov. 13 reveal that minor planet (18301) is a binary system with an orbital period of 35.7 Â± 0.1 hr or twice that. The primary shows a period of 2.67197 Â± 0.00008 hr and has a lightcurve amplitude of 0.16 magnitude at solar phases 3-11 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.07 to 0.14 magnitude deep indicate a secondary-to-primary mean-diameter ratio of 0.26 Â± 0.02. 2023 November 27 (CBET 5320) Daniel W. E. Green [2023-11-28 08:15, Ondrejov]

·	Our current data for this one give two possible solutions for the orbit period: 35.7 h or twice that. Lc decomposition for the shorter one: https://www.asu.cas.cz/~asteroid/18301_2023a_porb.png https://www.asu.cas.cz/~asteroid/18301_2023a_p1.png Note: The mutual orbit has a non-zero eccentricity, see the primary and secondary event separated by about 0.4 P_orb. More data (errors not greater than 0.015 mag) are needed to resolve between the two orbit periods. Event ephemeris for the shorter one follows; only some of the events will occur for the longer period, which will discriminate between the two solutions. Date/Time UTC (LTc.) Phase -------------------------- 2023-11- 2 6.24 0.313 2023-11- 3 17.94 0.313 2023-11- 5 5.64 0.313 2023-11- 6 17.34 0.313 2023-11- 8 5.04 0.313 2023-11- 9 16.74 0.313 2023-11-11 4.44 0.313 2023-11-12 16.14 0.313 2023-11-14 3.84 0.313 2023-11-15 15.54 0.313 2023-11-17 3.24 0.313 2023-11-18 14.94 0.313 2023-11-20 2.64 0.313 Date/Time UTC (LTc.) Phase -------------------------- 2023-11- 1 8.37 0.700 2023-11- 2 20.07 0.700 2023-11- 4 7.77 0.700 2023-11- 5 19.47 0.700 2023-11- 7 7.17 0.700 2023-11- 8 18.87 0.700 2023-11-10 6.57 0.700 2023-11-11 18.27 0.700 2023-11-13 5.97 0.700 2023-11-14 17.67 0.700 2023-11-16 5.37 0.700 2023-11-17 17.07 0.700 2023-11-19 4.77 0.700 2023-11-20 16.47 0.700 Clear Skies, Petr [2023-10-26 10:22, Ondrejov]

·	New data taken for this one by Russ Durkee, Vladimir Benishek, Alessandro Marchini, Riccardo Papini, and Fred Vachier joined in. There are two possible solutions for the orbit period: 35.7 h or twice that. Lc decomposition for the shorter one: https://www.asu.cas.cz/~asteroid/18301_2023a_porb.png https://www.asu.cas.cz/~asteroid/18301_2023a_p1.png Note: The mutual orbit has a non-zero eccentricity, see the primary and secondary event separated by about 0.4 P_orb. More data (errors < 0.015 mag) are needed to resolve between the two orbit periods. Event ephemeris for the shorter one follows; only some of the events will occur for the longer period, which will discriminate between the two solutions. Date/Time UTC (LTc.) Phase -------------------------- 2023-10-15 9.47 0.304 2023-10-16 21.17 0.304 2023-10-18 8.87 0.304 2023-10-19 20.57 0.304 2023-10-21 8.27 0.304 2023-10-22 19.97 0.304 2023-10-24 7.67 0.304 Date/Time UTC (LTc.) Phase -------------------------- 2023-10-15 23.68 0.702 2023-10-17 11.38 0.702 2023-10-18 23.08 0.702 2023-10-20 10.78 0.702 2023-10-21 22.48 0.702 2023-10-23 10.18 0.702 Clear Skies, Petr [2023-10-15 08:13, Ondrejov]

·	Starting a second night on this one. Russ [2023-10-09 01:43, Shed of Science]

·	Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary. A tentative lc decomposition (it is far from unique): https://www.asu.cas.cz/~asteroid/18301_2023a_porb.png https://www.asu.cas.cz/~asteroid/18301_2023a_p1.png More data (errors < 0.015 mag) are needed to catch more events and establish its orbit period. Clear Skies, Petr [2023-10-05 10:50, Ondrejov]

(7355) Bottke (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5319, copied below for your convenience.

Cheers, Petr

(7355) BOTTKE
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA,
U.S.A.; and J. Oey, Blue Mountains Observatory, Leura, NSW, Australia, report
that photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.63-m telescope at the Sugarloaf Mountain
Observatory, and a 0.35-m telescope at the Blue Mountains Observatory during
Oct. 29-Nov. 17 reveal that minor planet (7355) is a binary system with an
orbital period of 40.85 Â± 0.04 hr. The primary shows a period of 2.6364 Â±
0.0002 hr and has a lightcurve amplitude of 0.26 mag at solar phases 15-22
degrees. Mutual eclipse/occultation events that are 0.13 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.36.

2023 November 27 (CBET 5319) Daniel W. E. Green [2023-11-27 08:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 11/16 and 11/17 under good condition. [2023-11-18 07:08, Blue Mountains Obs] Message sent to observers

· More data taken for this one by Vladimir Benishek from Sopot. Likely solution:
https://www.asu.cas.cz/~asteroid/07355_2023a_porb.png
https://www.asu.cas.cz/~asteroid/07355_2023a_p1.png
The events are W-shaped, as expected for the eclipses and occultations occuring at significantly non-zero solar phases for this system where the two bodies are not quite close one to each other.

More data (errors not greater than 0.015 mag) are needed to confirm the solution. Event ephemeris (but don't limit your observations too narrowly around the predicted mid-event times, as the solution is still not very reliable):

Date/Time UTC (LTc.) Phase
--------------------------
2023-11-14 1.98 0.241
2023-11-15 18.88 0.241
2023-11-17 11.78 0.241
2023-11-19 4.68 0.241
2023-11-20 21.58 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2023-11-14 22.57 0.745
2023-11-16 15.47 0.745
2023-11-18 8.37 0.745
2023-11-20 1.27 0.745

Clear Skies, Petr [2023-11-13 12:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this returned "prime suspect" from Sopot, detected a suspect attenuation. A tentative lc decomposition (may be wrong):
https://www.asu.cas.cz/~asteroid/07355_2023a_p1.png
https://www.asu.cas.cz/~asteroid/07355_2023a_porb.png
(Note: The period in the 2nd plot above was set just for plotting purpose, there is no real determination of P_orb yet.)

More data (errors not greater than 0.015 mag) are needed to confirm it and establish its orbit period.

Clear Skies, Petr [2023-11-02 15:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed by Don Pray from Sugarloaf Mountain and by Vasilij Chiorny from Grakovo (Kharkiv): a U=2 result for the lightcurve symmetry allowing it to have a different number of maxima/minima per period than the assumed two, but otherwise it's a good coverage and no deviations seen,
http://www.asu.cas.cz/~asteroid/07355.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-11-19 14:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:20 UT. Got a good lc on it last night, but running it again as it's in the binary suspect range.
Don [2013-11-09 01:32, Sugarloaf]

· I plan to run this along with 5477 starting at 04:15, and running until 09:30 UT.
Don [2013-11-08 00:26, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This new target I observed 5 November 2013 about 4 hr and
6 November - 2 hr. Period about 2.6 hr, ampl 0.2 mag. Vasilij Ch. [2013-11-07 20:26, Kharkiv]

(5891) Gehrig [Add new note]
[Send data to: peter@asu.cas.cz ]
· Started this new target from 12 UT to 18 UT. [2023-11-22 11:02, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5891) Gehrig	[Add new note] [Send data to: peter@asu.cas.cz ]
·	Started this new target from 12 UT to 18 UT. [2023-11-22 11:02, Blue Mountains Obs]

(16233) 2000 FA12 - Returning prime suspect [Add new note]
[Send data to: peter@asu.cas.cz ]
· I've 2 runs on this so far.
Don [2023-11-02 22:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has taken two usable nights from Sopot for this return "prime suspect". No significant deviations seen,
http://www.asu.cas.cz/~asteroid/16233_b5.png
Cf. with the data from the first two apparitions:
http://www.asu.cas.cz/~asteroid/16233_b2.png
http://www.asu.cas.cz/~asteroid/16233.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir despite your less-than-ideal weather these days.

Petr [2015-12-15 12:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target on Dec. 12-13, 19:18-04:23 UT and Dec. 13-14, 19:52-01:37 UT.
Vladimir [2015-12-15 11:38, Sopot AO]

· This "prime suspect" was done by Don Pray in this 2nd apparition, no prominent deviation seen:
http://www.asu.cas.cz/~asteroid/16233_b2.png
Cf. with the 2006 data by Oleg Gerashchenko from Andrushivka:
http://www.asu.cas.cz/~asteroid/16233.png

Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2012-04-02 11:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this around 00:30 UT as a secondary target with less dense data collection than for 3481.
Don [2012-02-27 01:34, Sugarloaf]

· Started this at 00:10 UT for a 6 hour run. This will be the final run on this one.

At 06:00 UT I'll attempt a run on the fast-moving radar target 2000 ET70 and could potentially get 4 hours on that. [2012-02-18 00:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 00:25 UT and will go until clouds arrive in a few hours.
Don [2012-01-31 00:49, Sugarloaf]

· Started a run at 00:40 UT, and may get 4-5 hours in before the clouds come.
Don [2012-01-30 04:04, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target at ~01:50 UT. Light breeze isn't helping, but is forecast to diminish.
Don [2012-01-22 02:00, Sugarloaf]

· Three nights by Oleg Gerashchenko from Andrushivka Astronomical Observatory for this one: a unique period, good coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/16233.png
It has been done well for the Survey.
A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Pretty work on both targets, Oleg! Keep up the nice work.

Cheers, Petr [2006-10-30 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

(1785) Wurm - Returning prome suspect [Add new note]
[Send data to: peter@asu.cas.cz ]
· I've observed this one twice so far.
Don [2023-11-02 22:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray observed this "prime suspect" from Sugarloaf Mountain in its current apparition: No significant deviation seen.
http://www.asu.cas.cz/~asteroid/01785_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-12-21 13:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 03:10 UT.
Don [2020-12-07 02:05, Sugarloaf]

· Closed (it's insufficient data for BinAstPhotSurvey from this apparition). [2018-05-03 12:38, Ondrejov]

· 1785 Wurm observed last night from SARA SOUTH Chile. [2018-02-22 22:32, IAO-Isaac Aznar Obs.] Message sent to BinAstPhotSurvey conference

· Don Pray has done this return "prime suspect" from Sugarloaf Mountain on three nights: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01785_b6.png
Target done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-09-27 06:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this prime suspect Sep 23 UT.
Don [2016-09-24 18:39, Sugarloaf]

· Julian has done this one from Leura: Unique solution, sufficient coverage, excellent fit. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Excellent work, Julian.

Cheers, Petr [2008-03-07 10:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another excellent night for this target taken from 10:11UT to 18:37UT 2008-03-06. Period refined to 3.2696h+/-0.0004h. Amplitude remains the same. Julian [2008-03-07 03:45, Blue Mountains Obs]

· observed from 10:27UT to 14:40UT in excellent condition. Initial period estimation 3.26 +/- 0.01h with period 0.22 +/- 0.01mag. Here hoping the clouds, fog and instrument gremlins will stay away for good. [2008-03-04 01:15, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(11549) 1992 YY (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5305, copied below for your convenience.

Cheers, Petr

(11549) 1992 YY
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A.; and M. Husarik and G. Cervak, Skalnate Pleso Observatory, report that
photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.50-m telescope at the Shed of Science South
Observatory, and a 0.61-m telescope at the Skalnate Pleso Observatory during
Sept. 7 to Oct. 19 reveal that minor planet (11549) is a binary system with
an orbital period of 28.96 Â± 0.02 hr. The primary shows a period of 2.6703
Â± 0.0003 hr and has a lightcurve amplitude of 0.16 magnitude at solar
phases 7-8 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/
occultation events that are 0.08 magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.28.

2023 October 27 (CBET 5305) Daniel W. E. Green [2023-10-30 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will start a run on this one tonight.

Russ [2023-10-19 00:46, Shed of Science] Message sent to observers

· More data for this one taken by Vladimir Benishek from Sopot and by Marek Husarik from Skalnate Pleso. A likely solution:
https://www.asu.cas.cz/~asteroid/11549_2023a_porb.png
https://www.asu.cas.cz/~asteroid/11549_2023a_p1.png

More data (errors < 0.015 mag) are needed to nail down it. Event ephemeris for the likely solution (but don't limit your observations just around the predicted event times, the solution is not entirely reliable yet):

Date/Time UTC (LTc.) Phase
--------------------------
2023-10- 4 14.46 0.259
2023-10- 5 19.40 0.259
2023-10- 7 0.34 0.259
2023-10- 8 5.28 0.259
2023-10- 9 10.22 0.259
2023-10-10 15.16 0.259
2023-10-11 20.10 0.259
2023-10-13 1.04 0.259
2023-10-14 5.98 0.259
2023-10-15 10.92 0.259
2023-10-16 15.86 0.259
2023-10-17 20.80 0.259
2023-10-19 1.74 0.259
2023-10-20 6.68 0.259
2023-10-21 11.62 0.259
2023-10-22 16.56 0.259

Date/Time UTC (LTc.) Phase
--------------------------
2023-10- 3 23.89 0.756
2023-10- 5 4.83 0.756
2023-10- 6 9.77 0.756
2023-10- 7 14.71 0.756
2023-10- 8 19.65 0.756
2023-10-10 0.59 0.756
2023-10-11 5.53 0.756
2023-10-12 10.47 0.756
2023-10-13 15.41 0.756
2023-10-14 20.35 0.756
2023-10-16 1.29 0.756
2023-10-17 6.23 0.756
2023-10-18 11.17 0.756
2023-10-19 16.11 0.756
2023-10-20 21.05 0.756
2023-10-22 1.99 0.756

Clear Skies, Petr [2023-10-03 13:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Start to catch about 4h run.
-Marek [2023-09-20 19:50, SkalnatePleso] [Remove]
Message sent to observers

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative solution (may be wrong):
https://www.asu.cas.cz/~asteroid/11549_2023a_porb.png
https://www.asu.cas.cz/~asteroid/11549_2023a_p1.png

More data (errors < 0.015 mag) are needed to establish it well.

Clear Skies, Petr [2023-09-14 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

(11549) 1992 YY (Finished) - binary	[Add new note]
·	Our report on this one has appeared on CBET 5305, copied below for your convenience. Cheers, Petr (11549) 1992 YY V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; and M. Husarik and G. Cervak, Skalnate Pleso Observatory, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.50-m telescope at the Shed of Science South Observatory, and a 0.61-m telescope at the Skalnate Pleso Observatory during Sept. 7 to Oct. 19 reveal that minor planet (11549) is a binary system with an orbital period of 28.96 Â± 0.02 hr. The primary shows a period of 2.6703 Â± 0.0003 hr and has a lightcurve amplitude of 0.16 magnitude at solar phases 7-8 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/ occultation events that are 0.08 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.28. 2023 October 27 (CBET 5305) Daniel W. E. Green [2023-10-30 08:16, Ondrejov]

·	I will start a run on this one tonight. Russ [2023-10-19 00:46, Shed of Science]

·	More data for this one taken by Vladimir Benishek from Sopot and by Marek Husarik from Skalnate Pleso. A likely solution: https://www.asu.cas.cz/~asteroid/11549_2023a_porb.png https://www.asu.cas.cz/~asteroid/11549_2023a_p1.png More data (errors < 0.015 mag) are needed to nail down it. Event ephemeris for the likely solution (but don't limit your observations just around the predicted event times, the solution is not entirely reliable yet): Date/Time UTC (LTc.) Phase -------------------------- 2023-10- 4 14.46 0.259 2023-10- 5 19.40 0.259 2023-10- 7 0.34 0.259 2023-10- 8 5.28 0.259 2023-10- 9 10.22 0.259 2023-10-10 15.16 0.259 2023-10-11 20.10 0.259 2023-10-13 1.04 0.259 2023-10-14 5.98 0.259 2023-10-15 10.92 0.259 2023-10-16 15.86 0.259 2023-10-17 20.80 0.259 2023-10-19 1.74 0.259 2023-10-20 6.68 0.259 2023-10-21 11.62 0.259 2023-10-22 16.56 0.259 Date/Time UTC (LTc.) Phase -------------------------- 2023-10- 3 23.89 0.756 2023-10- 5 4.83 0.756 2023-10- 6 9.77 0.756 2023-10- 7 14.71 0.756 2023-10- 8 19.65 0.756 2023-10-10 0.59 0.756 2023-10-11 5.53 0.756 2023-10-12 10.47 0.756 2023-10-13 15.41 0.756 2023-10-14 20.35 0.756 2023-10-16 1.29 0.756 2023-10-17 6.23 0.756 2023-10-18 11.17 0.756 2023-10-19 16.11 0.756 2023-10-20 21.05 0.756 2023-10-22 1.99 0.756 Clear Skies, Petr [2023-10-03 13:48, Ondrejov]

·	Start to catch about 4h run. -Marek [2023-09-20 19:50, SkalnatePleso]	[Remove]

·	Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative solution (may be wrong): https://www.asu.cas.cz/~asteroid/11549_2023a_porb.png https://www.asu.cas.cz/~asteroid/11549_2023a_p1.png More data (errors < 0.015 mag) are needed to establish it well. Clear Skies, Petr [2023-09-14 07:51, Ondrejov]

(10756) 1990 SJ2 (Finished) [Add new note]
· This new target was done by Fred Vachier and by Russ Durkee: Unique solution, good coverage, no significant deviation.
https://www.asu.cas.cz/~asteroid/10756.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Fred and Russ!

Petr [2023-10-26 09:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did one night on this one.

Russ [2023-10-19 00:44, Shed of Science]

(10756) 1990 SJ2 (Finished)	[Add new note]
·	This new target was done by Fred Vachier and by Russ Durkee: Unique solution, good coverage, no significant deviation. https://www.asu.cas.cz/~asteroid/10756.png Target closed. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Good work, Fred and Russ! Petr [2023-10-26 09:11, Ondrejov]

·	Did one night on this one. Russ [2023-10-19 00:44, Shed of Science]

(6991) Chichibu (Finished) [Add new note]
· This new target was done by Fred Vachier from Reunion and by Romain Montaigut and Arnaud Leroy from OPERA. A good solution and coverage, no prominent deviation seen:
https://www.asu.cas.cz/~asteroid/06991.png
Object done sufficiently for the BinAstPhotSurvey, closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Petr [2023-10-26 09:08, Ondrejov] Message sent to BinAstPhotSurvey conference

(6991) Chichibu (Finished)	[Add new note]
·	This new target was done by Fred Vachier from Reunion and by Romain Montaigut and Arnaud Leroy from OPERA. A good solution and coverage, no prominent deviation seen: https://www.asu.cas.cz/~asteroid/06991.png Object done sufficiently for the BinAstPhotSurvey, closed. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Good work, guys. Petr [2023-10-26 09:08, Ondrejov]

(3574) Rudaux [Add new note]
[Send data to: peter@asu.cas.cz ]
· completed over the month of July and August. period determined as 76.4h. Data sent in.
observation is complete [2023-08-27 05:05, Blue Mountains Obs] Message sent to observers

· New target observed on 06/13,06/15,06/16,06/17 show that this asteroid is a long rotaton period object with period over 80h. [2023-10-14 11:38, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3574) Rudaux	[Add new note] [Send data to: peter@asu.cas.cz ]
·	completed over the month of July and August. period determined as 76.4h. Data sent in. observation is complete [2023-08-27 05:05, Blue Mountains Obs]

·	New target observed on 06/13,06/15,06/16,06/17 show that this asteroid is a long rotaton period object with period over 80h. [2023-10-14 11:38, Blue Mountains Obs]

(9940) 1988 VM3 (Finished) - binary [Add new note]
· Our binary discovery report on this one has appeared on CBET 5298, copied below for your convenience.

Cheers, Petr

(9940) 1988 VM_3
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during Sept. 7-19 reveal that minor planet (9940) is a
binary system with an orbital period of 25.8 Â± 0.1 hr. The primary shows a
period of 2.7135 Â± 0.0002 hr and has a lightcurve amplitude of 0.12
magnitude at solar phases 2-11 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.15 to 0.30 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.38. The secondary appears synchronous and has a light-curve amplitude (in
the combined primary-plus-secondary light curve) of 0.03 mag, suggesting a
moderately elongated shape with an equatorial-axis ratio of 1.2 Â± 0.1.

2023 October 2 (CBET 5298) Daniel W. E. Green [2023-10-03 07:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· I am doing another night on this one to catch the event.

Russ [2023-09-24 00:56, Shed of Science] Message sent to observers

· I am going to start a run on this one momentarily and go for the next 6 -7 hours

Russ [2023-09-23 00:52, Shed of Science]

· More data for this one taken by Vladimir Benishek from Sopot joined in. Current solution:
https://www.asu.cas.cz/~asteroid/09940_2023a_porb.png
https://www.asu.cas.cz/~asteroid/09940_2023a_p1.png

More data (errors <= 0.015 mag) are needed to nail down the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 9-14 14.74 0.255
2023- 9-15 16.54 0.255
2023- 9-16 18.34 0.255
2023- 9-17 20.14 0.255
2023- 9-18 21.94 0.255
2023- 9-19 23.74 0.255
2023- 9-21 1.54 0.255
2023- 9-22 3.34 0.255
2023- 9-23 5.14 0.255
2023- 9-24 6.94 0.255
2023- 9-25 8.74 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2023- 9-15 3.43 0.747
2023- 9-16 5.23 0.747
2023- 9-17 7.03 0.747
2023- 9-18 8.83 0.747
2023- 9-19 10.63 0.747
2023- 9-20 12.43 0.747
2023- 9-21 14.23 0.747
2023- 9-22 16.03 0.747
2023- 9-23 17.83 0.747
2023- 9-24 19.63 0.747
2023- 9-25 21.43 0.747

Clear Skies, Petr [2023-09-14 07:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot, found it to be a binary candidate. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/09940_2023a_p1.png
https://www.asu.cas.cz/~asteroid/09940_2023a_porb.png
(The P_orb value in the second plot above was set just for plotting purpose. There is no real solution for the orbit period yet.)

More data (errors < 0.02 mag) are needed to establish it well.

Clear Skies, Petr [2023-09-11 07:47, Ondrejov] Message sent to BinAstPhotSurvey conference

(9940) 1988 VM3 (Finished) - binary	[Add new note]
·	Our binary discovery report on this one has appeared on CBET 5298, copied below for your convenience. Cheers, Petr (9940) 1988 VM_3 V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A., report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science South Observatory during Sept. 7-19 reveal that minor planet (9940) is a binary system with an orbital period of 25.8 Â± 0.1 hr. The primary shows a period of 2.7135 Â± 0.0002 hr and has a lightcurve amplitude of 0.12 magnitude at solar phases 2-11 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.15 to 0.30 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.38. The secondary appears synchronous and has a light-curve amplitude (in the combined primary-plus-secondary light curve) of 0.03 mag, suggesting a moderately elongated shape with an equatorial-axis ratio of 1.2 Â± 0.1. 2023 October 2 (CBET 5298) Daniel W. E. Green [2023-10-03 07:31, Ondrejov]

·	I am doing another night on this one to catch the event. Russ [2023-09-24 00:56, Shed of Science]

·	I am going to start a run on this one momentarily and go for the next 6 -7 hours Russ [2023-09-23 00:52, Shed of Science]

·	More data for this one taken by Vladimir Benishek from Sopot joined in. Current solution: https://www.asu.cas.cz/~asteroid/09940_2023a_porb.png https://www.asu.cas.cz/~asteroid/09940_2023a_p1.png More data (errors <= 0.015 mag) are needed to nail down the solution. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2023- 9-14 14.74 0.255 2023- 9-15 16.54 0.255 2023- 9-16 18.34 0.255 2023- 9-17 20.14 0.255 2023- 9-18 21.94 0.255 2023- 9-19 23.74 0.255 2023- 9-21 1.54 0.255 2023- 9-22 3.34 0.255 2023- 9-23 5.14 0.255 2023- 9-24 6.94 0.255 2023- 9-25 8.74 0.255 Date/Time UTC (LTc.) Phase -------------------------- 2023- 9-15 3.43 0.747 2023- 9-16 5.23 0.747 2023- 9-17 7.03 0.747 2023- 9-18 8.83 0.747 2023- 9-19 10.63 0.747 2023- 9-20 12.43 0.747 2023- 9-21 14.23 0.747 2023- 9-22 16.03 0.747 2023- 9-23 17.83 0.747 2023- 9-24 19.63 0.747 2023- 9-25 21.43 0.747 Clear Skies, Petr [2023-09-14 07:17, Ondrejov]

·	Vladimir Benishek has observed this new target from Sopot, found it to be a binary candidate. A tentative lc decomposition: https://www.asu.cas.cz/~asteroid/09940_2023a_p1.png https://www.asu.cas.cz/~asteroid/09940_2023a_porb.png (The P_orb value in the second plot above was set just for plotting purpose. There is no real solution for the orbit period yet.) More data (errors < 0.02 mag) are needed to establish it well. Clear Skies, Petr [2023-09-11 07:47, Ondrejov]

(22569) 1998 HK36 (Finished) - binary [Add new note]
· Our binary discovery report on this one has appeared on CBET 5294, copied below for your convenience.

Cheers, Petr

(22569) 1998 HK36
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and J. Oey, Blue Mountains Observatory, Leura, NSW, Australia,
report that photometric observations taken with a 0.35-m telescope at the
Sopot Observatory in Serbia and a 0.35-m telescope at the Blue Mountains
Observatory during Aug. 26-Sept. 13 reveal that minor planet (22569) is a
binary system with an orbital period of 15.38 Â± 0.01 hr. The primary shows
a period of 2.75221 Â± 0.00013 hr and has a lightcurve amplitude of 0.09 mag
at solar phases 4-12 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.08 to 0.16 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.28.

2023 September 28 (CBET 5294) Daniel W. E. Green [2023-10-02 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 09/10,09/11,09/12,09/13 [2023-09-14 06:00, Blue Mountains Obs] Message sent to observers

· observed 10.5 to 18.5 UT under good condition of error <0.010. event captured. [2023-09-12 01:45, Blue Mountains Obs]

· More data by Vladimir Benishek from Sopot joined in. Current solution:
https://www.asu.cas.cz/~asteroid/22569_2023a_p1.png
https://www.asu.cas.cz/~asteroid/22569_2023a_porb.png

More data (errors < 0.02 mag) would be good to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 9-11 9.42 0.240
2023- 9-12 0.80 0.240
2023- 9-12 16.18 0.240
2023- 9-13 7.56 0.240
2023- 9-13 22.94 0.240
2023- 9-14 14.32 0.240
2023- 9-15 5.70 0.240
2023- 9-15 21.08 0.240
2023- 9-16 12.46 0.240
2023- 9-17 3.84 0.240
2023- 9-17 19.22 0.240
2023- 9-18 10.60 0.240
2023- 9-19 1.98 0.240
2023- 9-19 17.36 0.240
2023- 9-20 8.74 0.240
2023- 9-21 0.12 0.240
2023- 9-21 15.50 0.240
2023- 9-22 6.88 0.240
2023- 9-22 22.26 0.240
2023- 9-23 13.64 0.240
2023- 9-24 5.02 0.240
2023- 9-24 20.40 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2023- 9-11 17.05 0.735
2023- 9-12 8.43 0.735
2023- 9-12 23.81 0.735
2023- 9-13 15.19 0.735
2023- 9-14 6.57 0.735
2023- 9-14 21.95 0.735
2023- 9-15 13.33 0.735
2023- 9-16 4.71 0.735
2023- 9-16 20.09 0.735
2023- 9-17 11.47 0.735
2023- 9-18 2.85 0.735
2023- 9-18 18.23 0.735
2023- 9-19 9.61 0.735
2023- 9-20 0.99 0.735
2023- 9-20 16.37 0.735
2023- 9-21 7.75 0.735
2023- 9-21 23.13 0.735
2023- 9-22 14.51 0.735
2023- 9-23 5.89 0.735
2023- 9-23 21.27 0.735
2023- 9-24 12.65 0.735

Clear Skies, Petr [2023-09-11 07:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 10.5 to 18.5 UT under good condition of error <0.010. event captured. [2023-09-08 09:33, Blue Mountains Obs] Message sent to observers

· Vladimir Benishek has observed this off-list target from Sopot on 3 nights, found it to be a binary candidate. A tentative solution (may be wrong):
https://www.asu.cas.cz/~asteroid/22569_2023a_p1.png
https://www.asu.cas.cz/~asteroid/22569_2023a_porb.png

More data (errors < 0.015 mag) are needed to confirm and establish it well.

Clear Skies, Petr [2023-08-29 07:57, Ondrejov] Message sent to BinAstPhotSurvey conference

(22569) 1998 HK36 (Finished) - binary	[Add new note]
·	Our binary discovery report on this one has appeared on CBET 5294, copied below for your convenience. Cheers, Petr (22569) 1998 HK36 V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; and J. Oey, Blue Mountains Observatory, Leura, NSW, Australia, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia and a 0.35-m telescope at the Blue Mountains Observatory during Aug. 26-Sept. 13 reveal that minor planet (22569) is a binary system with an orbital period of 15.38 Â± 0.01 hr. The primary shows a period of 2.75221 Â± 0.00013 hr and has a lightcurve amplitude of 0.09 mag at solar phases 4-12 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.08 to 0.16 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.28. 2023 September 28 (CBET 5294) Daniel W. E. Green [2023-10-02 07:51, Ondrejov]

·	observed on 09/10,09/11,09/12,09/13 [2023-09-14 06:00, Blue Mountains Obs]

·	observed 10.5 to 18.5 UT under good condition of error <0.010. event captured. [2023-09-12 01:45, Blue Mountains Obs]

·	More data by Vladimir Benishek from Sopot joined in. Current solution: https://www.asu.cas.cz/~asteroid/22569_2023a_p1.png https://www.asu.cas.cz/~asteroid/22569_2023a_porb.png More data (errors < 0.02 mag) would be good to improve the solution before we publish it on CBET. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2023- 9-11 9.42 0.240 2023- 9-12 0.80 0.240 2023- 9-12 16.18 0.240 2023- 9-13 7.56 0.240 2023- 9-13 22.94 0.240 2023- 9-14 14.32 0.240 2023- 9-15 5.70 0.240 2023- 9-15 21.08 0.240 2023- 9-16 12.46 0.240 2023- 9-17 3.84 0.240 2023- 9-17 19.22 0.240 2023- 9-18 10.60 0.240 2023- 9-19 1.98 0.240 2023- 9-19 17.36 0.240 2023- 9-20 8.74 0.240 2023- 9-21 0.12 0.240 2023- 9-21 15.50 0.240 2023- 9-22 6.88 0.240 2023- 9-22 22.26 0.240 2023- 9-23 13.64 0.240 2023- 9-24 5.02 0.240 2023- 9-24 20.40 0.240 Date/Time UTC (LTc.) Phase -------------------------- 2023- 9-11 17.05 0.735 2023- 9-12 8.43 0.735 2023- 9-12 23.81 0.735 2023- 9-13 15.19 0.735 2023- 9-14 6.57 0.735 2023- 9-14 21.95 0.735 2023- 9-15 13.33 0.735 2023- 9-16 4.71 0.735 2023- 9-16 20.09 0.735 2023- 9-17 11.47 0.735 2023- 9-18 2.85 0.735 2023- 9-18 18.23 0.735 2023- 9-19 9.61 0.735 2023- 9-20 0.99 0.735 2023- 9-20 16.37 0.735 2023- 9-21 7.75 0.735 2023- 9-21 23.13 0.735 2023- 9-22 14.51 0.735 2023- 9-23 5.89 0.735 2023- 9-23 21.27 0.735 2023- 9-24 12.65 0.735 Clear Skies, Petr [2023-09-11 07:18, Ondrejov]

·	observed 10.5 to 18.5 UT under good condition of error <0.010. event captured. [2023-09-08 09:33, Blue Mountains Obs]

·	Vladimir Benishek has observed this off-list target from Sopot on 3 nights, found it to be a binary candidate. A tentative solution (may be wrong): https://www.asu.cas.cz/~asteroid/22569_2023a_p1.png https://www.asu.cas.cz/~asteroid/22569_2023a_porb.png More data (errors < 0.015 mag) are needed to confirm and establish it well. Clear Skies, Petr [2023-08-29 07:57, Ondrejov]

(7144) Dossobuono - new binary, more data needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· Starting a run on this one in good conditions.

Russ [2023-09-21 01:09, Shed of Science] Message sent to observers

· Two more nights by Vladimir Benishek from Sopot joined in. A likely solution:
https://www.asu.cas.cz/~asteroid/07144_2023a_porb.png
https://www.asu.cas.cz/~asteroid/07144_2023a_p1.png

More data (errors < 0.02 mag) are needed to confirm and improve the solution. A tentative event ephemeris (but don't limit your observations just around the predicted mid-event times; the solution is not very certain yet):

Date/Time UTC (LTc.) Phase
--------------------------
2023- 9- 3 2.97 0.270
2023- 9- 4 15.77 0.270
2023- 9- 6 4.57 0.270
2023- 9- 7 17.37 0.270
2023- 9- 9 6.17 0.270
2023- 9-10 18.97 0.270
2023- 9-12 7.77 0.270
2023- 9-13 20.57 0.270
2023- 9-15 9.37 0.270
2023- 9-16 22.17 0.270
2023- 9-18 10.97 0.270
2023- 9-19 23.77 0.270
2023- 9-21 12.57 0.270
2023- 9-23 1.37 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2023- 9- 3 20.38 0.743
2023- 9- 5 9.18 0.743
2023- 9- 6 21.98 0.743
2023- 9- 8 10.78 0.743
2023- 9- 9 23.58 0.743
2023- 9-11 12.38 0.743
2023- 9-13 1.18 0.743
2023- 9-14 13.98 0.743
2023- 9-16 2.78 0.743
2023- 9-17 15.58 0.743
2023- 9-19 4.38 0.743
2023- 9-20 17.18 0.743
2023- 9-22 5.98 0.743
2023- 9-23 18.78 0.743

Clear Skies, Petr [2023-08-29 07:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this returned binary suspect from Sopot on 6 nights. A tentative lc decomposition (may be wrong):
https://www.asu.cas.cz/~asteroid/07144_2023a_porb.png
https://www.asu.cas.cz/~asteroid/07144_2023a_p1.png

More high-quality data (errors < 0.015 mag) are needed to catch more events so that we can establish it well and determine its orbital period.

Clear Skies, Petr [2023-08-25 08:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was worked by Vladimir Benishek from Sopot and by Walt Cooney and coll. from SRO. The period appears to be reasonably detected (U = 2+), but the two apparent attenuations seen in the first two nights by Vladimir need to be confirmed (and their period established) in the future.
http://www.asu.cas.cz/~asteroid/07144.png
http://www.asu.cas.cz/~asteroid/07144_nsp.png
http://www.asu.cas.cz/~asteroid/07144_20150612.png
http://www.asu.cas.cz/~asteroid/07144_20150613.png

Petr [2015-07-02 10:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:35 UT.
Don [2015-06-25 01:37, Sugarloaf]

· Got a free night on this one the other night when it was in the field with (8474) Rettig. Will work it again tonight. -Walt [2015-06-18 02:14, Sonoita] Message sent to BinAstPhotSurvey conference

(3042) Zelinsky [Add new note]
[Send data to: peter@asu.cas.cz ]
· Sent three nights data to Petr and Peter on this one. Will continue to work when I can.

Russ [2023-09-09 19:04, Shed of Science] Message sent to BinAstPhotSurvey conference

· This new target was done by Don Pray from Sugarloaf Mountain and Vladimir Benishek from Sopot: It's a good U = 2 solution (for the low amplitude), multiple coverage, no deviation seen.
http://www.asu.cas.cz/~asteroid/03042.png
http://www.asu.cas.cz/~asteroid/03042_nsp.png
Target closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys on the low-amplitude object.

Cheers, Petr [2016-07-29 06:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another session was obtained on July 11-12, 21:34-01:33 UT.
Vladimir [2016-07-12 11:56, Sopot AO] Message sent to observers

· Plan to start this one at 04:30 UT.
Don [2016-07-12 01:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this target on July 10-11, 22:05-01:30 UT.
Vladimir [2016-07-11 09:50, Sopot AO] Message sent to observers

· I started this new target on July 6. I also plan to observe it tonight.
Don [2016-07-07 01:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

(6108) Glebov - binary suspect, more data needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· observed on 08/25,08/24, 08/16. Good condition and data sent in. [2023-08-26 05:31, Blue Mountains Obs] Message sent to observers

· Starting a run on this under good conditions.

Russ [2023-08-16 02:16, Shed of Science]

· Russ Durkee has observed this target on two nights, found it to be a binary suspect. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/06108_2023b_p1.png
https://www.asu.cas.cz/~asteroid/06108_2023b_porb.png
(The period in the 2nd plot above was set just for plotting purpose. There is no real solution for P_orb yet.)

More data are needed to confirm it.

Clear Skies, Petr [2023-08-14 13:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a second night on this one.

Russ [2023-08-14 03:46, Shed of Science]

· This is a U = 2+ result. Closed for now, note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2010-09-21 14:09, Ondrejov]

· Observed 2010-08-30 in average conditions cut short by cloud. Data reveals a period of 2.84 +/- 0.02 hrs. Data is sparse and somewhat noisy with error bars on the 0.03mag limit. [2010-08-31 07:12, HuntersHill] Message sent to observers

· HHO has restricted observing capability but was able to provide some coverage of this target. Limited data in less than ideal conditions reveals a period of 2.74 +/- 0.03 hrs, 0.22 +/- 0.03 mag [2010-08-30 01:44, HuntersHill] Message sent to BinAstPhotSurvey conference

(8167) Ishii - binary or ternary candidate [Add new note]
[Send data to: peter@asu.cas.cz ]
· Plan on starting this one in about 1 hour.

Russ [2023-08-26 03:18, Shed of Science] Message sent to observers

· Did a short night on this one. Will continue to follow this lunation.

Russ [2023-08-13 18:03, Shed of Science]

· This new target was observed by Vladimir Benishek from Sopot and by Russ Durkee from Shed of Science South. It has two additive periods and there were superimposed two deep attenuations on February 6.1 and 9.1 suggesting mutual events with a longer period, see
http://www.asu.cas.cz/~asteroid/08167_2021a_p1.png
http://www.asu.cas.cz/~asteroid/08167_2021a_p2.png
It is a serious binary (and possible ternary) candidate, but it needs to be established with high-quality thorough observations in the future.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-07-20 09:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· More observations by Vladimir Benishek from Sopot and by Russ Rurkee from Shed of Science South have led to an apparently unique solution for both rotational periods. Russ also catched on February 6 what appears to be an event (with a longer period), see the x-ed points in following plots:
http://www.asu.cas.cz/~asteroid/08167_2021a_p1.png
http://www.asu.cas.cz/~asteroid/08167_2021a_p2.png

More data (errors <= 0.03 mag) are needed to catch more events and establish their period. I encourage others here to help out.

Clear Skies, Petr [2021-02-09 09:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Following this one tonight. Russ [2021-02-07 02:57, Shed of Science] Message sent to observers

· Vladimir Benishek has observed this new target from Sopot on 3 nights, found an interesting complex lightcurve. There seem to be two (or more) lc components, but the data are insufficient to get a solution. See following to get idea:
http://www.asu.cas.cz/~asteroid/08167.png

I encourage others here to help out.

Clear Skies, Petr [2021-02-04 13:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· I worked this target on several nights.
Vladimir [2021-02-03 08:04, Sopot AO]

(2029) Binomi [Add new note]
[Send data to: peter@asu.cas.cz ]
· I've done 2 runs of this and will do another tonight, Aug 22 UT.
Don [2023-08-23 00:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2029) Binomi	[Add new note] [Send data to: peter@asu.cas.cz ]
·	I've done 2 runs of this and will do another tonight, Aug 22 UT. Don [2023-08-23 00:33, Sugarloaf]

(78085) 2002 LV23 (Finished) - probable binary [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 5 nights, supported with one run by Arnaud Leroy. There are present two additive periods, but no mutual events seen. So, it is a probable binary. The two lightcurve components:
https://www.asu.cas.cz/~asteroid/78085_2023a_p1.png
https://www.asu.cas.cz/~asteroid/78085_2023a_p2.png

Target closed for this apparition.

Petr [2023-08-13 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has observed this new target from Sugarloaf Mountain on 3 nights. There appear to be two periods in its lightcurve; a very tentative lc decomposition (may be wrong):
https://www.asu.cas.cz/~asteroid/78085_2023a_all.png
https://www.asu.cas.cz/~asteroid/78085_2023a_p1.png
https://www.asu.cas.cz/~asteroid/78085_2023a_p2.png

More high-quality data (errors < 0.02 mag) are needed to nail down it.

Clear Skies, Petr [2023-08-01 08:56, Ondrejov] Message sent to BinAstPhotSurvey conference

(78085) 2002 LV23 (Finished) - probable binary	[Add new note]
·	Don Pray observed this new target from Sugarloaf Mountain on 5 nights, supported with one run by Arnaud Leroy. There are present two additive periods, but no mutual events seen. So, it is a probable binary. The two lightcurve components: https://www.asu.cas.cz/~asteroid/78085_2023a_p1.png https://www.asu.cas.cz/~asteroid/78085_2023a_p2.png Target closed for this apparition. Petr [2023-08-13 08:15, Ondrejov]

·	Don Pray has observed this new target from Sugarloaf Mountain on 3 nights. There appear to be two periods in its lightcurve; a very tentative lc decomposition (may be wrong): https://www.asu.cas.cz/~asteroid/78085_2023a_all.png https://www.asu.cas.cz/~asteroid/78085_2023a_p1.png https://www.asu.cas.cz/~asteroid/78085_2023a_p2.png More high-quality data (errors < 0.02 mag) are needed to nail down it. Clear Skies, Petr [2023-08-01 08:56, Ondrejov]

(19373) 1997 YC14 [Add new note]
[Send data to: peter@asu.cas.cz ]
· Completed three nights on this one. Will do at least one more.
Russ [2023-08-09 13:24, Shed of Science] Message sent to BinAstPhotSurvey conference

(19373) 1997 YC14	[Add new note] [Send data to: peter@asu.cas.cz ]
·	Completed three nights on this one. Will do at least one more. Russ [2023-08-09 13:24, Shed of Science]

(2496) Fernandus (Finished) [Add new note]
· Russ Durkee observed this returned "prime suspect" on 4 nights in its current 3rd apparition. Good coverage, no significant deviation seen.
http://www.asu.cas.cz/~asteroid/02496_c3.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Russ!

Petr [2023-08-03 08:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have two nights on this object and will follow tonight as well assuming the moon is far enough away.

Russ [2023-07-26 00:21, Shed of Science]

· Vasilij Chiorny observed this new target from Kharkiv on four nights: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02496.png
Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Vasilij.

Petr [2019-04-16 12:48, Ondrejov] Message sent to BinAstPhotSurvey conference

(16591) 1992 SY17 (Finished) - prime suspect [Add new note]
· This returned "prime suspect" was observed by Russ Durkee, by Marek Husarik, and by Don Pray: Unique solution, thorough coverage, no significant deviation.
https://www.asu.cas.cz/~asteroid/16591_c3.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-07-24 08:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on July 15.
- Marek [2023-07-17 08:31, SkalnatePleso] [Remove]
Message sent to observers

· Will start a run at about 4UT going for 6 hours.

Russ [2023-07-13 02:34, Shed of Science]

· Observing on July 11, plan to make 3 hr run.
- Marek [2023-07-11 21:12, SkalnatePleso] [Remove]
Message sent to observers

· Observed at the Skalnate Pleso on July 9.9 about 3 hours.
- Marek [2023-07-10 12:34, SkalnatePleso] [Remove]

· I have one night on this object and doing a second night on 7/10/23 starting at about 4:00 UT

Russ [2023-07-10 02:21, Shed of Science] Message sent to BinAstPhotSurvey conference

· This new target was observed by Walt Cooney, John Gross and Dirk Terrell from Sonoita: a U=2 result for the lightcurve symmetry allowing it to have a different number of maxima/minima per period than the assumed two, but otherwise it's a good coverage and no deviations seen,
http://www.asu.cas.cz/~asteroid/16591.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-11-26 14:54, Ondrejov] Message sent to BinAstPhotSurvey conference

(16591) 1992 SY17 (Finished) - prime suspect	[Add new note]
·	This returned "prime suspect" was observed by Russ Durkee, by Marek Husarik, and by Don Pray: Unique solution, thorough coverage, no significant deviation. https://www.asu.cas.cz/~asteroid/16591_c3.png Target closed. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2023-07-24 08:20, Ondrejov]

·	Observed on July 15. - Marek [2023-07-17 08:31, SkalnatePleso]	[Remove]

·	Will start a run at about 4UT going for 6 hours. Russ [2023-07-13 02:34, Shed of Science]

·	Observing on July 11, plan to make 3 hr run. - Marek [2023-07-11 21:12, SkalnatePleso]	[Remove]

·	Observed at the Skalnate Pleso on July 9.9 about 3 hours. - Marek [2023-07-10 12:34, SkalnatePleso]	[Remove]

·	I have one night on this object and doing a second night on 7/10/23 starting at about 4:00 UT Russ [2023-07-10 02:21, Shed of Science]



·	This new target was observed by Walt Cooney, John Gross and Dirk Terrell from Sonoita: a U=2 result for the lightcurve symmetry allowing it to have a different number of maxima/minima per period than the assumed two, but otherwise it's a good coverage and no deviations seen, http://www.asu.cas.cz/~asteroid/16591.png Done for the Survey, http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Cheers, Petr [2013-11-26 14:54, Ondrejov]

(1195) Orangia [Add new note]
[Send data to: peter@asu.cas.cz ]
· I've done 2 sessions on this, July 20 and 23.
Don [2023-07-23 23:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1195) Orangia	[Add new note] [Send data to: peter@asu.cas.cz ]
·	I've done 2 sessions on this, July 20 and 23. Don [2023-07-23 23:14, Sugarloaf]

(22053) 2000 AO17 (Finished) [Add new note]
· XX [2023-07-14 08:56, Ondrejov]

· This new target was observed by Fred Vachier and colleagues. It is a relatively slow rotator.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Object closed for the Survey.

Petr [2023-07-14 08:56, Ondrejov]

(22053) 2000 AO17 (Finished)	[Add new note]
·	XX [2023-07-14 08:56, Ondrejov]

·	This new target was observed by Fred Vachier and colleagues. It is a relatively slow rotator. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Object closed for the Survey. Petr [2023-07-14 08:56, Ondrejov]

(2883) Barabashov (Finished) - binary [Add new note]
· Incomplete coverage of P_orb/2, unfortunately. Petr [2023-07-13 08:20, Ondrejov]

· Doing a run on this one tonight.
Don [2022-11-20 00:26, Sugarloaf] Message sent to observers

· I observed this on Nov 2,3 and 4.
Don [2022-11-08 02:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Our report on this new binary has appeared on CBET 4722, copied below for your convenience. Congratulations Russ for your first definite binary asteroid discovery!

Cheers, Petr

(2883) BARABASHOV
R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; and
P. Pravec, H. Kucakova, and K. Hornoch, Ondrejov Observatory, report that
photometric observations taken with a 0.50-m telescope at the Shed of Science
South Observatory and a 0.65-m telescope at the Ondrejov Observatory during
2019 Dec. 17-2020 Jan. 20 reveal that minor planet (2883) is a binary system
with an orbital period of 43.12 Â± 0.01 hr. The primary shows a period of
2.6839 Â± 0.0002 hr and has a lightcurve amplitude of 0.08 magnitude at
solar phases 1-7 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.06 to 0.08 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.25 Â± 0.02.

2020 February 5 (CBET 4722) Daniel W. E. Green [2020-02-06 08:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one tonight, hoping to catch the 0.75 deviation.

Russ [2020-01-20 05:01, Shed of Science] Message sent to observers

· Recent observations by Russ Durkee from Shed of Science South and by Hana Kucakova, Kamil Hornoch and Peter Kusnirak from here provide a likely solution for this one:
http://www.asu.cas.cz/~asteroid/02883_2019b_porb.png
http://www.asu.cas.cz/~asteroid/02883_2019b_p1.png
http://www.asu.cas.cz/~asteroid/02883_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02883_2019a_p1.png

More high-quality (errors 0.01 mag) data are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 1-14 1.89 0.250
2020- 1-15 20.99 0.250
2020- 1-17 16.09 0.250
2020- 1-19 11.19 0.250
2020- 1-21 6.29 0.250
2020- 1-23 1.39 0.250
2020- 1-24 20.49 0.250
2020- 1-26 15.59 0.250
2020- 1-28 10.69 0.250
2020- 1-30 5.79 0.250
2020- 2- 1 0.89 0.250
2020- 2- 2 19.99 0.250
2020- 2- 4 15.09 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2020- 1-14 23.20 0.745
2020- 1-16 18.30 0.745
2020- 1-18 13.40 0.745
2020- 1-20 8.50 0.745
2020- 1-22 3.60 0.745
2020- 1-23 22.70 0.745
2020- 1-25 17.80 0.745
2020- 1-27 12.90 0.745
2020- 1-29 8.00 0.745
2020- 1-31 3.10 0.745
2020- 2- 1 22.20 0.745
2020- 2- 3 17.30 0.745

Clear Skies, Petr [2020-01-09 08:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one tonight at about 1 UT on 1/7

Russ [2020-01-07 03:02, Shed of Science] Message sent to observers

· Started this one again At 1UT on 1/6

Russ [2020-01-06 02:01, Shed of Science]

· Should be able to follow this again tonight under good conditions starting at about 01:30 UT on 1/5

Russ [2020-01-04 23:29, Shed of Science] Message sent to observers

· Following again tonight under marginal conditions.

Russ [2019-12-24 02:31, Shed of Science]

· Following tonight, conditions not very good though.

Russ [2019-12-23 04:39, Shed of Science] Message sent to observers

· Started again tonight about 3UT

Russ [2019-12-22 05:08, Shed of Science]

· Observing again tonight starting at about 3UT.

Russ [2019-12-19 03:08, Shed of Science] Message sent to observers

· Will start tonight 12/18 3UT. Also have data from last night. Will process.

Russ [2019-12-18 03:19, Shed of Science] Message sent to BinAstPhotSurvey conference

· This new target was observed by Don Pray from Sugarloaf Mountain on six nights, supported with one night by Romain Montaigut and Arnaud Leroy from OPERA.
http://www.asu.cas.cz/~asteroid/02883.png
http://www.asu.cas.cz/~asteroid/02883_nsp.png

Despite the period ambiguity, no significant deviation is apparent. Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort guys on the tough target.

Petr [2017-03-22 08:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· We also observed this new target on the night of 16/03.
It seems to have a small amplitude.
Arnaud and Romain [2017-03-19 00:08, OPERA] Message sent to observers

· I've observed this one on Mar 3,5,6 and 18.
Don [2017-03-18 21:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1829) Dawson (Finished) - binary suspect [Add new note]
· Suspect attenuations seen, but no consistent solution.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-07-13 08:00, Ondrejov]

· Following Dawson again tonight.

Russ [2022-09-30 02:10, Shed of Science] Message sent to observers

· Weather looks good tonight, will follow again.

Russ [2022-09-28 00:09, Shed of Science]

· Starting on this one again tonight.

Russ [2022-09-20 02:01, Shed of Science] Message sent to observers

· Got two nights on this one on 9/16 and 9/17 will continue to follow.

Russ [2022-09-18 15:28, Shed of Science] Message sent to BinAstPhotSurvey conference

· Don Pray did this return "prime suspect" from Sugarloaf Mountain on three nights, supported with one night by Julian Oey: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01829_b7.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-02-06 07:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this prime suspect at 03:50 UT.
Don [2017-02-02 01:11, Sugarloaf]

· Closed for the 3rd apparition. One suspect attenuation unconfirmed. Petr [2015-10-26 09:33, Ondrejov]

· Observed last night Oct. 03, 17:39 - 21:40 UT.
Vladimir [2015-10-04 11:07, Sopot AO] Message sent to observers

· Observed on Oct. 02, 17:46 - 21:39 UT.
Vladimir [2015-10-03 12:58, Sopot AO]

· observed for 09/13 and 09/14 for 5 and 6 hours respectively. [2015-09-15 06:54, Blue Mountains Obs] Message sent to observers

· Julian Oey has taken four nights for this return "prime suspect" from Leura in its current 3rd apparition. There are two suspect attenuations, a deeper one on 09-01 and a shallow one on 09-12, see
http://www.asu.cas.cz/~asteroid/01829_201509_porb.png
http://www.asu.cas.cz/~asteroid/01829_201509_p1.png
(The period in the first plot above is arbitrary; no solution for P_orb has been obtained.)
No prominent deviations were seen in three good-quality runs taken by Michal Pikler and Marek Husarik from Skalnate Pleso in August
http://www.asu.cas.cz/~asteroid/01829_201508_p1.png
nor in the previous data taken by Don Pray and David Higgins from Carbuncle Hill and Hunters Hill in 2005 and 2007, respectively.

A confirmation is needed; I enourage others here to help out. Good quality data (errors not greater than 0.02 mag) only will be useful.

Clear Skies, Petr [2015-09-14 11:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 09/12 from 09:42 UT for 6 hours. [2015-09-13 01:27, Blue Mountains Obs] Message sent to observers

· observed on 09/09 and 09/11 [2015-09-12 05:00, Blue Mountains Obs]

· observed on 09/01 found to have period of 4.2h and 0.26m amplitude [2015-09-02 11:05, Blue Mountains Obs] Message sent to observers

· Michal performed observations on two nights (5. and 6.Aug).
Marek [2015-08-07 12:05, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This "primary suspect" has been done well enough by David from Hunters Hill in its second apparition for the BinAstPhotSurvey: The period estimates from the two apparitions are in a reasonable agreement (within a few sigma), David has covered it reasonably, no significant deviation seen. It is finished for the Survey again, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

In due time I will check for this (and other) follow-up targets how their 2nd apparition data improve a probability of binary detection ....

Good work, David, on the follow-up target.

Cheers, Petr [2007-03-22 17:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Have been observing over the last week on and off between weather. 10/11/13/14th in average to poor conditions and lots of background stars to subtract.

Data reveals a period of 4.2463 +/- 0.0009hrs with an amplitude of 0.20 +/- 0.02mag. No significant deviations noted.

Cheers

David [2007-03-16 10:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· This is an info that Don Pray has finished the target: P=4.254 +/- 0.001 h, three nights, double coverage, no deviation seen. Well done for the Survey.
The note added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work, Don!

Cheers, Petr [2005-09-20 06:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this tonight (sep 11, 2005), weather permitting. [2005-09-10 22:53, CarbuncleHill]

(1169) Alwine (Finished) - binary candidate [Add new note]
· Remains a binary candidate. Needs to be confirmed with extensive and high-quality observations from two or more stations.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-07-13 07:47, Ondrejov]

· Doing a run on this one tonight.
Don [2022-10-15 01:31, Sugarloaf] Message sent to observers

· I'm doing a run on this one tonight, Sep 24 UT.
Don [2022-09-24 00:54, Sugarloaf]

· I started this on Sep 15 UT.
Don [2022-09-15 20:28, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Despite extensive effort by Don Pray, Paolo Bacci and Vladimir Benishek, we have not obtained a satisfactory solution for this binary candidate. Several apparent attenuations fit roughly with a period of 54.45 h, but the fit is not very good, see following plots.
http://www.asu.cas.cz/~asteroid/01169_2019a_porb.png
http://www.asu.cas.cz/~asteroid/01169_2019a_p1.png
http://www.asu.cas.cz/~asteroid/01169_2019b_porb.png
http://www.asu.cas.cz/~asteroid/01169_2019b_p1.png
http://www.asu.cas.cz/~asteroid/01169_2019c_porb.png
http://www.asu.cas.cz/~asteroid/01169_2019c_p1.png
http://www.asu.cas.cz/~asteroid/01169_2019d_porb.png
http://www.asu.cas.cz/~asteroid/01169_2019d_p1.png
It needs to be confirmed in the future.

Target closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-04-06 10:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:05 UT.
Don [2020-03-05 00:03, Sugarloaf] Message sent to observers

· Started this one at 00:10 UT.
Don [2020-03-01 01:02, Sugarloaf]

· Observing this one tonight.
Don [2020-02-29 01:41, Sugarloaf]

· Started a run on this one tonight....finally some clear skies!
Russ [2020-02-25 02:26, Shed of Science] Message sent to observers

· Did a run on this on Feb 24 UT.
Don [2020-02-24 20:59, Sugarloaf]

· I observed this last night, Feb 22, and started a run tonight at 23:40, Feb 22 UT.
Don [2020-02-22 23:52, Sugarloaf] Message sent to observers

· We observer on feb 21/22 22:15 UT to 01:20 UT
from 104 B&M [2020-02-21 23:49, Paolo Bacci]

· I observed this on Feb 20 and 21.
Don [2020-02-21 21:02, Sugarloaf] Message sent to observers

· I got a session on this one on Feb. 15-16 UT.
Vladimir [2020-02-16 13:57, Sopot AO]

· I started this one at 00:45 UT.
Don [2020-02-15 00:41, Sugarloaf]

· A (still somewhat tentative) decomposition of our current data for this new binary:
http://www.asu.cas.cz/~asteroid/01169_2019b_porb.png
http://www.asu.cas.cz/~asteroid/01169_2019b_p1.png

There remains an ambiguity in the P_orb solution that we need to resolve with more data. Only good data with errors < 0.02 mag will be useful; don't bother in less ideal conditions.

Clear Skies, Petr [2020-02-06 10:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one last night (Feb. 01-02).
Vladimir [2020-02-02 13:30, Sopot AO] Message sent to observers

· Observing this tonight, Jan 30 UT.
Don [2020-01-29 23:55, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this one again on Jan 22 UT.
Don [2020-01-22 13:59, Sugarloaf]

· Don Pray has observed this new target from Sugarloaf Mountain. There appears to be a 0.06-mag deep attenuation in the first hour of his last night, see following tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/01169_2019b_porb.png
http://www.asu.cas.cz/~asteroid/01169_2019b_p1.png

More data (errors < 0.02 mag) are needed to confirm.

Clear Skies, Petr [2020-01-22 09:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this Dec 23.
Don [2019-12-24 01:51, Sugarloaf]

· I observed this last night and plan to again, tonight (Dec 21).
Don [2019-12-21 01:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2897) Ole-Romer (Finished) - Paired Asteroid [Add new note]
· Target closed for this apparition. Petr [2023-07-11 11:20, Ondrejov]

· Doing this one tonight. [2023-03-19 23:59, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2897) Ole-Romer (Finished) - Paired Asteroid	[Add new note]
·	Target closed for this apparition. Petr [2023-07-11 11:20, Ondrejov]

·	Doing this one tonight. [2023-03-19 23:59, Sugarloaf]

(25884) Asai (Finished) - Paired Asteroid [Add new note]
· Target finished for this apparition. Petr [2023-07-11 09:28, Ondrejov]

· Doing this one tonight.
Don [2022-11-29 01:48, Sugarloaf] Message sent to observers

· Observing this tonight, Nov 22, UT.
Don [2022-11-21 23:51, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Doing this one tonight.
Don [2022-11-20 00:25, Sugarloaf]

· I did runs on this paired asteroid on Oct 28 and 30.
Don [2022-10-31 00:28, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This paired asteroid was done enough for this apparition. Petr [2016-08-31 07:36, Ondrejov]

· observed 08/26 and 08/27 [2016-08-30 11:29, Blue Mountains Obs] Message sent to observers

· New target deep in the South [2016-07-02 22:57, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(4905) Hiromi (Finished) [Add new note]
· Target closed for this apparition. Petr [2023-07-10 13:26, Ondrejov]

· observed on several consecutive nights of this paired asteroid to obtain a period of 6.0449h consistent with previous result. 12/19,12/24,12/25,12/26,12/27,12/28 sessions were done. [2023-01-10 21:16, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Target closed for this apparition. Petr [2019-03-19 13:54, Ondrejov]

· Doing a run on this tonight for this lunation.
Don [2019-02-01 02:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for the 3rd apparition. Petr [2017-11-19 12:35, Ondrejov]

· Doing a run on this tonight for this lunation.
Don [2017-11-18 00:35, Sugarloaf] Message sent to observers

· I did a run on this on Sep 10.
Don [2017-09-10 20:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this on Aug 22.
DOn [2017-08-23 21:48, Sugarloaf]

· Nice observations of the primary of the asteroid pair (our NEOSource project target) were taken by Don Pray from Sugarloaf Mountain and Julian Oey from Leura):
http://www.asu.cas.cz/~asteroid/004905.png
Done for now.

Cheers, Petr [2013-09-30 10:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 13.5 to 18UT 09/29 , period about 6 hours. [2013-09-30 04:30, Blue Mountains Obs] Message sent to observers

· Plan to do a run on this at 04:20 UT.
Don [2013-09-24 23:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be starting this new target after 76818 sets at 04:35 UT.
Don [2013-09-24 01:06, Sugarloaf]

(5554) Keesey (Finished) [Add new note]
· This new target done, closed for the Survey.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-07-10 13:08, Ondrejov]

· Starting a third night on this one.

RUss [2022-09-30 02:10, Shed of Science] Message sent to BinAstPhotSurvey conference

(2478) Tokai (Finished) - fully synchronous binary [Add new note]
· Done in the 7th apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-07-10 12:17, Ondrejov]

· I observed this on Nov 2,3 and 4.

Help from a significantly different longitude will likely be needed to capture both events as the orbital period is 25.9 hrs.

Don [2022-11-07 20:16, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done in the 6th apparition. [2017-05-02 12:47, Ondrejov]

· New data were taken for this one by Vladimir Benishek from Sopot and by Marek Husarik and coll. from Skalnate Pleso.
http://www.asu.cas.cz/~asteroid/02478_2017a.png

Event ephemeris for the next lunation:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 4-14 6.39 0.255
2017- 4-15 8.29 0.255
2017- 4-16 10.18 0.255
2017- 4-17 12.08 0.255
2017- 4-18 13.97 0.255
2017- 4-19 15.87 0.255
2017- 4-20 17.76 0.255
2017- 4-21 19.66 0.255
2017- 4-22 21.55 0.255
2017- 4-23 23.45 0.255
2017- 4-25 1.34 0.255
2017- 4-26 3.24 0.255
2017- 4-27 5.13 0.255
2017- 4-28 7.03 0.255
2017- 4-29 8.92 0.255
2017- 4-30 10.82 0.255
2017- 5- 1 12.71 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2017- 4-14 19.35 0.756
2017- 4-15 21.25 0.756
2017- 4-16 23.14 0.756
2017- 4-18 1.04 0.756
2017- 4-19 2.93 0.756
2017- 4-20 4.83 0.756
2017- 4-21 6.72 0.756
2017- 4-22 8.62 0.756
2017- 4-23 10.51 0.756
2017- 4-24 12.41 0.756
2017- 4-25 14.30 0.756
2017- 4-26 16.20 0.756
2017- 4-27 18.09 0.756
2017- 4-28 19.99 0.756
2017- 4-29 21.88 0.756
2017- 4-30 23.78 0.756

Petr [2017-04-05 06:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Event ephemeris for the next lunation:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-16 2.97 0.245
2017- 3-17 4.87 0.245
2017- 3-18 6.76 0.245
2017- 3-19 8.66 0.245
2017- 3-20 10.55 0.245
2017- 3-21 12.45 0.245
2017- 3-22 14.34 0.245
2017- 3-23 16.24 0.245
2017- 3-24 18.13 0.245
2017- 3-25 20.03 0.245
2017- 3-26 21.92 0.245
2017- 3-27 23.82 0.245
2017- 3-29 1.71 0.245
2017- 3-30 3.61 0.245
2017- 3-31 5.50 0.245
2017- 4- 1 7.40 0.245
2017- 4- 2 9.29 0.245
2017- 4- 3 11.19 0.245
2017- 4- 4 13.08 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-15 14.01 0.745
2017- 3-16 15.91 0.745
2017- 3-17 17.80 0.745
2017- 3-18 19.70 0.745
2017- 3-19 21.59 0.745
2017- 3-20 23.49 0.745
2017- 3-22 1.38 0.745
2017- 3-23 3.28 0.745
2017- 3-24 5.17 0.745
2017- 3-25 7.07 0.745
2017- 3-26 8.96 0.745
2017- 3-27 10.86 0.745
2017- 3-28 12.75 0.745
2017- 3-29 14.65 0.745
2017- 3-30 16.54 0.745
2017- 3-31 18.44 0.745
2017- 4- 1 20.33 0.745
2017- 4- 2 22.23 0.745
2017- 4- 4 0.12 0.745

Petr [2017-03-08 09:50, Ondrejov]

· Fred Vachier covered the 0.25-phase event sufficiently for this lunation:
http://www.asu.cas.cz/~asteroid/02478_2017a.png
A coverage for the 0.75-phase event would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3- 3 17.14 0.744
2017- 3- 4 19.04 0.744
2017- 3- 5 20.93 0.744
2017- 3- 6 22.83 0.744
2017- 3- 8 0.72 0.744

Petr [2017-03-03 13:15, Ondrejov]

· target planified this night. between 16h30 UT to 0h00 UT; [2017-02-24 14:14, Les Makes]

· Telescope started at 22:25 UT. Gabo [2017-02-19 22:31, SkalnatePleso] [Remove]
Message sent to observers

· observed 02/09 and captured an event. [2017-02-11 01:17, Blue Mountains Obs]

· First data for this one by Marek Husarik and coll. from Skalnate Pleso in this apparition:
http://www.asu.cas.cz/~asteroid/02478_2017a.png

Event ephemeris is below. More data would be useful, but please don't overkill; just a double coverage of each of the two events per lunation will be entirely sufficient.

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2-14 23.94 0.250
2017- 2-16 1.83 0.250
2017- 2-17 3.73 0.250
2017- 2-18 5.62 0.250
2017- 2-19 7.52 0.250
2017- 2-20 9.41 0.250
2017- 2-21 11.31 0.250
2017- 2-22 13.20 0.250
2017- 2-23 15.10 0.250
2017- 2-24 16.99 0.250
2017- 2-25 18.89 0.250
2017- 2-26 20.78 0.250
2017- 2-27 22.68 0.250
2017- 3- 1 0.57 0.250
2017- 3- 2 2.47 0.250
2017- 3- 3 4.36 0.250
2017- 3- 4 6.26 0.250
2017- 3- 5 8.15 0.250
2017- 3- 6 10.05 0.250
2017- 3- 7 11.94 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2-15 12.87 0.750
2017- 2-16 14.76 0.750
2017- 2-17 16.66 0.750
2017- 2-18 18.55 0.750
2017- 2-19 20.45 0.750
2017- 2-20 22.34 0.750
2017- 2-22 0.24 0.750
2017- 2-23 2.13 0.750
2017- 2-24 4.03 0.750
2017- 2-25 5.92 0.750
2017- 2-26 7.82 0.750
2017- 2-27 9.71 0.750
2017- 2-28 11.61 0.750
2017- 3- 1 13.50 0.750
2017- 3- 2 15.40 0.750
2017- 3- 3 17.29 0.750
2017- 3- 4 19.19 0.750
2017- 3- 5 21.08 0.750
2017- 3- 6 22.98 0.750
2017- 3- 8 0.87 0.750

Petr [2017-02-06 11:45, Ondrejov]

· Observed on Jan 27 with 6h run.
Marek [2017-01-30 11:50, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Done for the 5th apparition. Petr [2014-06-09 10:57, Ondrejov]

· Great data were obtained by Joe Pollock and Julian Oey in this apparition so far:
http://www.asu.cas.cz/~asteroid/02478_2014a.png
http://www.asu.cas.cz/~asteroid/02478_2014b.png

Last observations for both events would be useful for modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 5-18 7.09 0.245
2014- 5-19 8.98 0.245
2014- 5-20 10.88 0.245
2014- 5-21 12.77 0.245
2014- 5-22 14.67 0.245
2014- 5-23 16.56 0.245
2014- 5-24 18.46 0.245
2014- 5-25 20.35 0.245
2014- 5-26 22.25 0.245
2014- 5-28 0.14 0.245
2014- 5-29 2.04 0.245
2014- 5-30 3.93 0.245
2014- 5-31 5.83 0.245
2014- 6- 1 7.72 0.245
2014- 6- 2 9.62 0.245
2014- 6- 3 11.51 0.245
2014- 6- 4 13.41 0.245
2014- 6- 5 15.30 0.245
2014- 6- 6 17.20 0.245
2014- 6- 7 19.09 0.245
2014- 6- 8 20.99 0.245
2014- 6- 9 22.88 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2014- 5-18 20.05 0.746
2014- 5-19 21.94 0.746
2014- 5-20 23.84 0.746
2014- 5-22 1.73 0.746
2014- 5-23 3.63 0.746
2014- 5-24 5.52 0.746
2014- 5-25 7.42 0.746
2014- 5-26 9.31 0.746
2014- 5-27 11.21 0.746
2014- 5-28 13.10 0.746
2014- 5-29 15.00 0.746
2014- 5-30 16.89 0.746
2014- 5-31 18.79 0.746
2014- 6- 1 20.68 0.746
2014- 6- 2 22.58 0.746
2014- 6- 4 0.47 0.746
2014- 6- 5 2.37 0.746
2014- 6- 6 4.26 0.746
2014- 6- 7 6.16 0.746
2014- 6- 8 8.05 0.746
2014- 6- 9 9.95 0.746
2014- 6-10 11.84 0.746

Clear Skies, Petr [2014-05-12 11:10, Ondrejov]

· Began run from Prompt Tololo at 2315 UT. Hope to cover 0.748 event centered at 0224 UT and observe until ~0900 UT. Joe [2014-04-24 23:31, Dark Sky & PROMPT] Message sent to observers

· Good run from Perth 1530-1950 UT on 56768. Covered about the first 2/3 of the phase 0.748 event. Joe [2014-04-21 03:23, Dark Sky & PROMPT]

· Good run from Prompt Tololo 0200-0940 UT. Covered the phase 0.249 event centered at 0401 UT. Joe [2014-04-19 18:49, Dark Sky & PROMPT] Message sent to observers

· Joe Pollock took great data for both events in the current apparition so far:
http://www.asu.cas.cz/~asteroid/02478_b4.png

Monitoring of both events would be useful for modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-18 2.13 0.249
2014- 4-19 4.02 0.249
2014- 4-20 5.92 0.249
2014- 4-21 7.81 0.249
2014- 4-22 9.71 0.249
2014- 4-23 11.60 0.249
2014- 4-24 13.50 0.249
2014- 4-25 15.39 0.249
2014- 4-26 17.29 0.249
2014- 4-27 19.18 0.249
2014- 4-28 21.08 0.249
2014- 4-29 22.97 0.249
2014- 5- 1 0.87 0.249
2014- 5- 2 2.76 0.249
2014- 5- 3 4.66 0.249
2014- 5- 4 6.55 0.249
2014- 5- 5 8.45 0.249
2014- 5- 6 10.34 0.249
2014- 5- 7 12.24 0.249
2014- 5- 8 14.13 0.249
2014- 5- 9 16.03 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-18 15.04 0.748
2014- 4-19 16.93 0.748
2014- 4-20 18.83 0.748
2014- 4-21 20.72 0.748
2014- 4-22 22.62 0.748
2014- 4-24 0.51 0.748
2014- 4-25 2.41 0.748
2014- 4-26 4.30 0.748
2014- 4-27 6.20 0.748
2014- 4-28 8.09 0.748
2014- 4-29 9.99 0.748
2014- 4-30 11.88 0.748
2014- 5- 1 13.78 0.748
2014- 5- 2 15.67 0.748
2014- 5- 3 17.57 0.748
2014- 5- 4 19.46 0.748
2014- 5- 5 21.36 0.748
2014- 5- 6 23.25 0.748
2014- 5- 8 1.15 0.748
2014- 5- 9 3.04 0.748

Clear Skies, Petr [2014-04-15 11:06, Ondrejov]

· Began run from Prompt Tololo at 0015 UT. Currently in middle of 0.750 event centered at 0149 UT. Joe [2014-04-11 01:52, Dark Sky & PROMPT] Message sent to observers

· First two nights for this apparition by Joe Pollock with Prompt:
http://www.asu.cas.cz/~asteroid/02478_b4.png

As usually, covering each of the two events twice per lunation would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4- 8 9.09 0.250
2014- 4- 9 10.99 0.250
2014- 4-10 12.88 0.250
2014- 4-11 14.78 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4- 7 20.13 0.750
2014- 4- 8 22.03 0.750
2014- 4- 9 23.92 0.750
2014- 4-11 1.82 0.750

Clear Skies, Petr [2014-04-07 12:53, Ondrejov]

· Began run from Prompt Tololo at 0045 UT. Hope to get ~9 hours of different phase coverage than Perth run. Joe [2014-04-03 05:20, Dark Sky & PROMPT] Message sent to observers

· Returning binary from current target list. Began run from Perth at 1235 UT. Hope to get ~9 hours if the weather holds. Joe [2014-04-02 15:57, Dark Sky & PROMPT]

· Done for the 4th apparition. Petr [2012-12-21 10:48, Ondrejov]

· Taking last data for its current apparition will be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-12- 2 10.77 0.249
2012-12- 3 12.67 0.249
2012-12- 4 14.56 0.249
2012-12- 5 16.46 0.249
2012-12- 6 18.35 0.249
2012-12- 7 20.25 0.249
2012-12- 8 22.14 0.249
2012-12-10 0.04 0.249
2012-12-11 1.93 0.249
2012-12-12 3.83 0.249
2012-12-13 5.72 0.249
2012-12-14 7.62 0.249
2012-12-15 9.51 0.249
2012-12-16 11.41 0.249
2012-12-17 13.30 0.249
2012-12-18 15.20 0.249
2012-12-19 17.09 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2012-12- 1 21.91 0.753
2012-12- 2 23.81 0.753
2012-12- 4 1.70 0.753
2012-12- 5 3.60 0.753
2012-12- 6 5.49 0.753
2012-12- 7 7.39 0.753
2012-12- 8 9.28 0.753
2012-12- 9 11.18 0.753
2012-12-10 13.07 0.753
2012-12-11 14.97 0.753
2012-12-12 16.86 0.753
2012-12-13 18.76 0.753
2012-12-14 20.65 0.753
2012-12-15 22.55 0.753
2012-12-17 0.44 0.753
2012-12-18 2.34 0.753
2012-12-19 4.23 0.753

Clear Skies, Petr [2012-11-26 11:26, Ondrejov]

· Plan to start observations from Prompt at 0010 UT and cover secondary event at 0221 UT if possible. Joe [2012-11-06 23:47, Dark Sky & PROMPT] Message sent to observers

· Observing it from 18:42 UT.
Stefan/Leos [2012-10-23 19:30, Modra]

· Great data taken for this synchronous double asteroid so far:
http://www.asu.cas.cz/~asteroid/02478_1209.png
http://www.asu.cas.cz/~asteroid/02478_1210.png
In this month it has been done sufficiently by Peter Kusnirak from here, by Don Pray from Sugarloaf Mountain, by Marek Husarik from Skalnate Pleso and by Joe Pollock with Prompt.

Monitoring the event evolution in November will be useful. (It will be ready for modeling after this apparition is over in December.) We expect the events will widen again as solar phase increases after the opposition. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 5.71 0.249
2012-11- 3 7.61 0.249
2012-11- 4 9.50 0.249
2012-11- 5 11.40 0.249
2012-11- 6 13.29 0.249
2012-11- 7 15.19 0.249
2012-11- 8 17.08 0.249
2012-11- 9 18.98 0.249
2012-11-10 20.87 0.249
2012-11-11 22.77 0.249
2012-11-13 0.66 0.249
2012-11-14 2.56 0.249
2012-11-15 4.45 0.249
2012-11-16 6.35 0.249
2012-11-17 8.24 0.249
2012-11-18 10.14 0.249
2012-11-19 12.03 0.249
2012-11-20 13.93 0.249
2012-11-21 15.82 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 18.77 0.754
2012-11- 3 20.67 0.754
2012-11- 4 22.56 0.754
2012-11- 6 0.46 0.754
2012-11- 7 2.35 0.754
2012-11- 8 4.25 0.754
2012-11- 9 6.14 0.754
2012-11-10 8.04 0.754
2012-11-11 9.93 0.754
2012-11-12 11.83 0.754
2012-11-13 13.72 0.754
2012-11-14 15.62 0.754
2012-11-15 17.51 0.754
2012-11-16 19.41 0.754
2012-11-17 21.30 0.754
2012-11-18 23.20 0.754
2012-11-20 1.09 0.754
2012-11-21 2.99 0.754
2012-11-22 4.88 0.754

Clear Skies, Petr [2012-10-21 06:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 01:10 UT and should catch much of the 0.246 phase event.
Don [2012-10-18 01:31, Sugarloaf]

· I'll be starting this one at 01:10 UT.
Don [2012-10-17 00:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start observations from Prompt at 0000 UT and cover secondary event if possible. Joe [2012-10-12 21:47, Dark Sky & PROMPT] Message sent to observers

· Starting from 22 UT.
Marek [2012-10-08 22:01, SkalnatePleso] [Remove]

· I'll be starting this at 01:55 UT and should capture much of the 0.246 phase event.
Don [2012-10-07 01:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing it from 20:42 UT.
Stefan [2012-09-25 20:53, Modra]

· This return binary has been started in its current 4th apparition by Don Pray from Sugarloaf Mountain and by Jozef Vilagi and Stefan Gajdos from Modra:
http://www.asu.cas.cz/~asteroid/02478_12a.png

Monitoring the event evolution in following couple months is needed. It will be ready for modeling after this apparition. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 5 4.36 0.246
2012-10- 6 6.26 0.246
2012-10- 7 8.15 0.246
2012-10- 8 10.05 0.246
2012-10- 9 11.94 0.246
2012-10-10 13.84 0.246
2012-10-11 15.73 0.246
2012-10-12 17.63 0.246
2012-10-13 19.52 0.246
2012-10-14 21.42 0.246
2012-10-15 23.31 0.246
2012-10-17 1.21 0.246
2012-10-18 3.10 0.246
2012-10-19 5.00 0.246
2012-10-20 6.89 0.246
2012-10-21 8.79 0.246
2012-10-22 10.68 0.246
2012-10-23 12.58 0.246
2012-10-24 14.47 0.246
2012-10-25 16.37 0.246
2012-10-26 18.26 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 5 17.45 0.752
2012-10- 6 19.34 0.752
2012-10- 7 21.24 0.752
2012-10- 8 23.13 0.752
2012-10-10 1.03 0.752
2012-10-11 2.92 0.752
2012-10-12 4.82 0.752
2012-10-13 6.71 0.752
2012-10-14 8.61 0.752
2012-10-15 10.50 0.752
2012-10-16 12.40 0.752
2012-10-17 14.29 0.752
2012-10-18 16.19 0.752
2012-10-19 18.08 0.752
2012-10-20 19.98 0.752
2012-10-21 21.87 0.752
2012-10-22 23.77 0.752
2012-10-24 1.66 0.752
2012-10-25 3.56 0.752
2012-10-26 5.45 0.752

Clear Skies, Petr [2012-09-24 13:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 21:16 UT.
Stefan [2012-09-23 22:20, Modra]

· Observing it from 21:16 UT on Sep.20, 2012. Awaiting cirrus clouds soon.
Stefan [2012-09-20 21:55, Modra]

· I plan to start this at 03:10 UT.
Don [2012-09-20 02:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing from ~21UT, expecting cirrus soon. Jozef [2012-09-18 21:17, Modra]

· Trying to observe from ~22:11UT in spite of some cirrus. Jozef [2012-09-17 22:46, Modra]

· Don's data for this returning synchronous binary (observed at its 4th apparition) are shown in plot bellow. They agree very well with data taken in previous apparitions. Due to its P_orb (25.9 h) it would be very useful if somebody at different longitude can help Don to improve light-curve coverage!

http://www.asu.cas.cz/~asteroid/02478_12.png

Peter K. [2012-09-17 13:38, Ondrejov] Message sent to observers

· Planning to start 2478 at 03:20. Will actually be starting 2006 at 02:55 rather 03:20 UT.
Don [2012-09-17 01:12, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll start this one at 03:30 UT.
Don [2012-09-16 00:12, Sugarloaf]

· I'll be starting this synchronous binary at 03:30 UT.
Don [2012-09-14 01:47, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observations by Don from Carbuncle Hill and by Peter and Kamil from here on 11 nights covered about 60% of the orbital/rotational phases, containing one event:
http://www.asu.cas.cz/~asteroid/02478_b0.png
A full solution is waiting for linking the Ondrejov sessions. Anyway, it is closed for this 3rd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Petr [2010-03-04 13:00, Ondrejov]

· Very good observations taken by Don from Carbuncle Hill and by Peter from here during 2010 Jan 10-24,
http://www.asu.cas.cz/~asteroid/02478_b0.png

More data are needed to complete coverage and to get sufficient overlap between sessions for a unique solution, so observations on phases that have not been covered sufficiently (i.e., most phases) are needed.

Clear Skies, Petr [2010-01-26 15:26, Ondrejov]

· Started a run at 00:55 UT.
Don [2010-01-24 01:00, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 17 UT but awaiting clouds later tonight. Peter K. [2010-01-23 18:26, Ondrejov] Message sent to observers

· Started a run at 01:15 UT.
Don [2010-01-23 01:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed for 4 hours tonight (18-22 UT). Peter K. [2010-01-22 22:43, Ondrejov] Message sent to observers

· Started a run at 01:20 UT.
Don [2010-01-22 01:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started a run on this at 23:15, Jan 14 UT.
Help from other observers at different latitudes would be useful as the primary period is just under 26 hours.
Don [2010-01-14 23:29, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 23:25, Jan 10 UT.
Don [2010-01-11 03:27, CarbuncleHill]

· Started a run at 23:20, Jan 9 UT.
Don [2010-01-10 03:41, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· The returning synchronous binary has been observed by Julian from Leura on 9 nights in the current (2nd) apparition. The asteroid was about 147-deg distant in the sky from its position in the 1st (discovery) apparition. Events (maybe slithly less central than in the 1st apparition) have been observed, and a bit changed rotational lightcurve have been seen, but more data in a next apparition will be needed; in the next opposition in December 2009 the asteroid will be located about 57 deg from its discovery apparition, so data from that apparition may provide a more geometry change needed for modeling of the system.
http://www.asu.cas.cz/~asteroid/02478_a8.png
http://www.asu.cas.cz/~asteroid/02478.png
A note put to the Survey's web page
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great work, Julian!

Cheers, Petr [2008-08-01 14:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 09:50 UT to 19:11UT 2008-07-21. the 0.75 phase event captured. Julian [2008-07-22 02:39, Blue Mountains Obs]

· Two new nights by Julian joined in, updated solution:
http://www.asu.cas.cz/~asteroid/02478_a8.png
The 0.25-phase event shows an evolution (as expected for decreasing solar phase). The 0.75-phase event needs more coverage. Ephemeris given in my previous message.

Cheers, Petr [2008-07-15 08:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 10:07 UT to 19:48UT 2008-07-11 and 10:31UT to 19:55 UT 2008-07-14 in good condition. Complete event captured on 14th . Julian [2008-07-15 07:18, Blue Mountains Obs]

· Two more sessions by Julian, captured the other event,
http://www.asu.cas.cz/~asteroid/02478_a8.png

More observations covering the events as well as outside events (long or linked sessions) are needed. Ephemeris for both events for the next lunation:

Date/Time UTC (LTc.) Phase
--------------------------
2008- 7-21 2.22 0.255
2008- 7-22 4.11 0.255
2008- 7-23 6.00 0.255
2008- 7-24 7.89 0.255
2008- 7-25 9.79 0.255
2008- 7-26 11.68 0.255
2008- 7-27 13.57 0.255
2008- 7-28 15.46 0.255
2008- 7-29 17.35 0.255
2008- 7-30 19.24 0.255
2008- 7-31 21.13 0.255
2008- 8- 1 23.02 0.255
2008- 8- 3 0.92 0.255
2008- 8- 4 2.81 0.255
2008- 8- 5 4.70 0.255
2008- 8- 6 6.59 0.255
2008- 8- 7 8.48 0.255
2008- 8- 8 10.37 0.255
2008- 8- 9 12.26 0.255
2008- 8-10 14.15 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2008- 7-21 15.15 0.755
2008- 7-22 17.04 0.755
2008- 7-23 18.94 0.755
2008- 7-24 20.83 0.755
2008- 7-25 22.72 0.755
2008- 7-27 0.61 0.755
2008- 7-28 2.50 0.755
2008- 7-29 4.39 0.755
2008- 7-30 6.28 0.755
2008- 7-31 8.17 0.755
2008- 8- 1 10.07 0.755
2008- 8- 2 11.96 0.755
2008- 8- 3 13.85 0.755
2008- 8- 4 15.74 0.755
2008- 8- 5 17.63 0.755
2008- 8- 6 19.52 0.755
2008- 8- 7 21.41 0.755
2008- 8- 8 23.30 0.755
2008- 8-10 1.20 0.755 [2008-07-15 06:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 13:40UT to 18:12 UT 2008-07-05 and 11:18UT to 17:35UT 2008-07-08. Event captured on the 2nd night but missed on its minimum due to cloud interuptions. data sent in. [2008-07-09 01:54, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Two full-night and one short session by Julian from Leura taken during 2008 June 27 to July 2: A complete event captured around July 2.75:
http://www.asu.cas.cz/~asteroid/02478_a8.png

More observations covering the events (each of the two events needs to be covered twice) as well as outside events (long or linked sessions) are needed. Ephemeris for both events:

Date/Time UTC (LTc.) Phase
--------------------------
2008- 6-30 14.29 0.255
2008- 7- 1 16.18 0.255
2008- 7- 2 18.07 0.255
2008- 7- 3 19.96 0.255
2008- 7- 4 21.85 0.255
2008- 7- 5 23.74 0.255
2008- 7- 7 1.63 0.255
2008- 7- 8 3.52 0.255
2008- 7- 9 5.42 0.255
2008- 7-10 7.31 0.255
2008- 7-11 9.20 0.255
2008- 7-12 11.09 0.255
2008- 7-13 12.98 0.255
2008- 7-14 14.87 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2008- 6-30 1.33 0.755
2008- 7- 1 3.22 0.755
2008- 7- 2 5.11 0.755
2008- 7- 3 7.00 0.755
2008- 7- 4 8.89 0.755
2008- 7- 5 10.78 0.755
2008- 7- 6 12.67 0.755
2008- 7- 7 14.57 0.755
2008- 7- 8 16.46 0.755
2008- 7- 9 18.35 0.755
2008- 7-10 20.24 0.755
2008- 7-11 22.13 0.755
2008- 7-13 0.02 0.755
2008- 7-14 1.91 0.755
2008- 7-15 3.81 0.755

Clear Skies, Petr [2008-07-04 09:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 11:58UT to 15:10UT 2008-07-01 and 10:13UT to 19:59UT 2008-07-02. An event captured at the end of the second session. Julian [2008-07-03 12:13, Blue Mountains Obs]

· appear to monitoring at a maxima for the past two consecutive sessions [2008-07-01 13:57, Via Capote] Message sent to observers

· Started monitoring with numerous background stars - good conditions [2008-06-30 14:36, Via Capote] Message sent to BinAstPhotSurvey conference

· Started observation 11:40UT to 20:04 UT 2008-06-27 under good condition but plenty of background stars to content with. Julian [2008-06-28 07:49, Blue Mountains Obs]

· Two new sessions joined in:
2007-03-11.9 by Nelya from Simeiz,
2007-03-21.1 by Don from Carbuncle Hill.
The Nelya's data covering the 0.26-phase event agree entirely with the data by Peter K. here covering the event on March 11.9 and 12.9. The recent data by Don covering the 0.76-phase event show a continuing broadening of the event, as expected with increasing solar phase:
http://www.asu.cas.cz/~asteroid/02478.png
http://www.asu.cas.cz/~asteroid/02478_07mar.png
One more session completing the coverage should suffice for the 0.76-phase event for this lunation. If there occurs an opportunity (despite our other urgent targets) to monitor the 0.26-phase event from Europe during the next few nights, it would be useful.

Cheers, Petr [2007-03-22 10:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Clouds came in after 1 hr.
Don [2007-03-22 02:22, CarbuncleHill]

· Started at 00:00, and hope to get the descending slope of the 0.765 phase event. Clouds 300 km out and closing.

Don [2007-03-22 00:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 23:20 UT in very good conditions.
Don [2007-03-21 00:35, CarbuncleHill]

· Data for the binary taken in this lunation:
2007-03-04.9 by Stefan and Jozef from Modra
2007-03-08.1 and 9.1 by Don from Carbuncle Hill
2007-03-11.9 and 12.9 by Peter from here
have covered both events well for now:
http://www.asu.cas.cz/~asteroid/02478.png
http://www.asu.cas.cz/~asteroid/02478_07mar.png
The data monitoring the evolution of the events will be useful for modeling. No more data are needed for the events now. More follow-up observations later in this lunation when solar phase increases more should show more evolution, therefore they would bring further information. An updated events prediction follows.

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3-19 9.97 0.265
2007- 3-20 11.86 0.265
2007- 3-21 13.75 0.265
2007- 3-22 15.64 0.265
2007- 3-23 17.53 0.265
2007- 3-24 19.42 0.265
2007- 3-25 21.31 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3-18 21.03 0.765
2007- 3-19 22.92 0.765
2007- 3-21 0.81 0.765
2007- 3-22 2.70 0.765
2007- 3-23 4.60 0.765
2007- 3-24 6.49 0.765
2007- 3-25 8.38 0.765 [2007-03-13 11:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20 UT. Peter K. [2007-03-12 21:49, Ondrejov]

· Observing from 19:30 to 22:40 UT. Nelya G., Simeiz [2007-03-11 23:52, Simeiz] Message sent to BinAstPhotSurvey conference

· Observing from 18:30 UT and covering 0.26-phase event. Peter K. [2007-03-11 19:07, Ondrejov]

· Don's data from last night finished coverage of 0.76-phase event for now and it is not necessary to observe it more.

Please concentrate your effort on 0.26-phase event only! It was last observed on Jan 26.6 and we don't know how it evolves with increasing solar phase!

Peter K. [2007-03-10 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this again to cover the 0.75 phase event. Last night's attempt was degraded by two background stars.
Don [2007-03-09 02:02, CarbuncleHill]

· I'll be starting this soon. I should catch the 0.75 phase event if the weather holds.
Don [2007-03-07 23:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· The last night's data by Stefan and Jozef from Modra joined in:
http://www.asu.cas.cz/~asteroid/02478.png
The 0.76-phase event has widened again, as expected at the increased solar phase where shadow displacement is larger again. It will be useful to get one more session for the event later in this lunation when solar phase is even higher. A coverage of the 0.26-phase event is of the highest interest now; it was last covered on January 27.

Clear Skies, Petr [2007-03-05 08:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 18:56 to 01:00 UT on Mar.4/5. Taken phase 0.76 and wing after (almost one quarter of period).

Stefan/Jozef [2007-03-05 02:50, Modra]

· Follow up observations for this binary in the March lunation would be useful for future modeling. Enclosed below is an ephemeris for the events. Note that data outside events are needed too, to keep track of the rotational component, so it should be best to observe it during whole night, not just limiting the run around predicted event time.

Clear Skies, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3- 7 13.03 0.260
2007- 3- 8 14.92 0.260
2007- 3- 9 16.81 0.260
2007- 3-10 18.70 0.260
2007- 3-11 20.59 0.260
2007- 3-12 22.48 0.260
2007- 3-14 0.38 0.260
2007- 3-15 2.27 0.260
2007- 3-16 4.16 0.260
2007- 3-17 6.05 0.260
2007- 3-18 7.94 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3- 8 1.99 0.760
2007- 3- 9 3.88 0.760
2007- 3-10 5.77 0.760
2007- 3-11 7.66 0.760
2007- 3-12 9.55 0.760
2007- 3-13 11.44 0.760
2007- 3-14 13.33 0.760
2007- 3-15 15.23 0.760
2007- 3-16 17.12 0.760
2007- 3-17 19.01 0.760
2007- 3-18 20.90 0.760 [2007-02-28 13:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two new nights 2007-02-18.0 and 18.9 by Peter K. from here joined in, they covered most of the 0.75-phase event. Peter has also linked all five Ondrejov nights: they fit well to 0.01 mag. Current solution:
http://www.asu.cas.cz/~asteroid/02478.png
The 0.75-phase event was covered enough for now. It would be good to cover also the 0.25-phase event to see how it evolves (it was last observed on Jan. 27); its ephemeris follows

Date/Time UTC (LTc.) Phase
--------------------------
2007- 2-20 10.55 0.260
2007- 2-21 12.45 0.260
2007- 2-22 14.34 0.260
2007- 2-23 16.23 0.260
2007- 2-24 18.12 0.260
2007- 2-25 20.01 0.260
2007- 2-26 21.90 0.260

Cheers, Petr [2007-02-19 13:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:15 UT and expecting part of an event. Peter K. [2007-02-18 19:22, Ondrejov]

· Observing from 19:30 UT and expecting long run outside the events. Peter K. [2007-02-17 20:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2007-02-05.5 by Julian from Leura, covering the last remaining gap around phase 0.4.
2007-02-10.0 by Peter K. from here.
2007-02-15.5 and 16.6 by David from Hunters Hill, covering the 0.75-phase event. The event is narrower now, exactly as expected at the lower solar phase of 3.6 deg where there is a smaller shadow displacement than it was at solar phases around 13 degrees in the January lunation.
http://www.asu.cas.cz/~asteroid/02478.png

Cheers, Petr [2007-02-17 13:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 15/16Feb. 15th in poor conditions but 16th in excellent conditions. Both nights caught events. Data sent to Petr. [2007-02-17 06:45, HuntersHill]

· Observing from 21:50 UT in average conditions, expecting short run due to cloud coverage. Michal [2007-02-09 22:09, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 21:40 UT but weather will not allow any long run. Peter K. [2007-02-09 21:42, Ondrejov]

· Started on 10:57UT 05/02 and end 17:16UT when cloud start to role in. Working backward on the ephemeris, I think this cover phase 0.3-0.7. no events captured.
Julian [2007-02-05 23:47, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Our announcement on the binary has appeared on CBET 824 a few tens minutes ago. I'm enclosing its text below for your convenience, and I am going to mention it on our web pages.

Cheers, Petr

(2478) TOKAI
D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak, Ondrejov
Observatory; B. Warner, Palmer Divide Observatory, Colorado Springs, CO;
A. Galad, Modra Observatory; J. Oey, Leura, N.S.W., Australia; R.
Goncalves, Linhaceira, Tomar, Portugal; and W. Cooney, J. Gross, and D.
Terrell, Sonoita Research Observatory, Sonoita, AZ, report that photometric
observations obtained during Jan. 20-28 reveal that minor planet (2478)
is a synchronous binary system with a period of 25.885 ± 0.007 hours.
A combined rotation lightcurve has an amplitude of 0.41 mag, and
superimposed mutual events indicate a lower limit on a secondary-to-primary
mean-diameter ratio of 0.72.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2007 CBAT
2007 January 30 (CBET 824) Daniel W. E. Green [2007-01-30 16:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Walt, John and Dirk took data from Sonoita on 2007 Jan. 28.4. It covered the gap at phase 0.82. A good solution (without the P/2 assumption) is obtained now: the best fit period is 25.885 +/- 0.007 h,
http://www.asu.cas.cz/~asteroid/02478.png
A lower limit on Ds/Dp is 0.72. Completing coverage of the 0.75-phase event (occuring for North American observers during these nights) will be needed. A coverage of phases around 0.4 from an European station would contribute to the solution significantly too. Nevertheless, we can prepare an announcement for CBET now.

One general comment on interpreting lightcurve data of synchronous binaries. There is one principal obstacle that affects modeling of synchronous binaries from lightcurve observations: Rotational lightcurves of the two components cannot be separated from the observed combined lightcurve. In simpler words, we don't know how much of the rotational amplitude is due to the primary and how much of it is from the secondary. One consequence of that is that an estimation of Ds/Dp, which is ratio of mean diameters at equatorial aspect, cannot be done with so high precission as for asynchronous binaries in which we can separate contributions from both components directly.

Cheers, Petr [2007-01-29 09:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data by Rui from Linhaceira taken on 2007 Jan. 28.1 joined in,
http://www.asu.cas.cz/~asteroid/2478.png
They cover phases 0.49- that have not been covered yet. With them, it is apparent upon closer examination that the rotational lightcurve is not entirely symmetric with P/2, so solution with the assumption is only approximate, and we need to link the two blocks to nail down the solution. Either with a direct photometric linkage, or with covering one of the gaps on phases 0.37-0.49 and around phase 0.82.

Cheers, Petr [2007-01-28 13:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· David's session of 2007 Jan. 27.6 joined in. The best fit period (still with the P/2 symmetry assumption) is 25.880 +/-0.007 h,
http://www.asu.cas.cz/~asteroid/2478.png

To answer David's question: "Is it still worth covering the parts that are well observed or should I move onto another target?" The maximum around phase 1.0 was covered enough, there is no need to take more data there. Move onto another target for the rest of the lunation.

Cheers, Petr [2007-01-28 09:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Running 2478 Tokai from SRO tonight.

-Walt [2007-01-28 02:42, Sonoita]

· Observed from 12:06UT to 17:43UT in good conditions. Caught the front part of the phase 0.25 dip. According to the ephemeris I won't hit the Phase 0.75 minima or the missing part of the curve until early February. Is it still worth covering the parts that are well observed or should I move onto another target? [2007-01-28 00:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· David has asked for ephemeris of the events. It is enclosed below. Yes, sure, the events need to be covered more; we expect they will evolve (and the 0.75-phase event was not yet covered well anyway). Just remember that we need to cover also the gaps in the rotational lightcurve, phases 0.3-0.6 and around 0.82. Only phases 0.9-1.1 have been already covered well, so they don't need to be worked more now.

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 1-27 16.62 0.248
2007- 1-28 18.50 0.248
2007- 1-29 20.38 0.248
2007- 1-30 22.25 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2007- 1-28 5.57 0.749
2007- 1-29 7.45 0.749
2007- 1-30 9.33 0.749
2007- 1-31 11.21 0.749 [2007-01-27 13:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in
2007-01-26.3 by Brian from PDO
2007-01-26.5 by Julian from Leura
2007-01-26.6 by David from Hunters Hill
The Brian's session covers the 1.0-phase maximum, improving its coverage
there needed.
The sessions by Julian and David cover the 0.25-phase minimum.

A period solution from the rotational component data, assuming a
symmetry with P/2, gives 25.878 ±0.007 h,
http://www.asu.cas.cz/~asteroid/2478.png
When the data covering phases in and around the 0.75-phase minimum
(sessions 1, 6, and 7) are linked with the other sessions covering
phases 0.83-1.37, we will refine the period solution without the P/2
symmetry assumption. The linkage of the two so far formally unlinked
blocks of data covering the two minima will be best done with direct
photometric linkage of some sessions from both blocks (the most
promissing for that is the two Ondrejov sessions no. 2 and 7, which
Peter will link on a photometric night here). Alternatively, the two
blocks can be linked with a new session that will bridge one of the two
gaps between them, on phases 0.37-0.58 or around phase 0.82.

A lower limit on Ds/Dp is 0.75.

Cheers, Petr [2007-01-27 11:47, Ondrejov]

· Observed from 12:08UT to 18:05UT is what started as ideal conditions but deteriorated half way through with cloud and high winds. Caught the entire second event with both shoulders and the plot looks reasonably good even though the images were very wind effected. (It was a swirling wind so the images weren't trailled - the stars were enlarged) [2007-01-27 00:07, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started at 11:37 26/01 UT but cut short by clouds at 14:39h. Hope David have better luck.
Julian [2007-01-26 21:13, Blue Mountains Obs]

· For those planning for tonight, the forecast says I will _not_ be observing, so this needs coverage in the U.S. longitudes if possible. [2007-01-26 21:08, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Wind and clouds prevented any useful data from being collected.
Don [2007-01-26 20:31, CarbuncleHill]

· Data by Adrian from Modra of the past night joined in,
http://www.asu.cas.cz/~asteroid/2478.png
Zero points of magnitude scales of sessions 1 and 6 should be established with overlaps with further data.

Cheers, Petr [2007-01-26 08:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Changing conditions caused I interrupted. Peter started this but finished soon. :-( Adrian [2007-01-26 02:12, Modra]

· The weather is better tonight, so I'll start this around 2-3 UT, and overlap Brian's run a bit.
Don [2007-01-26 00:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· It looks to be clear, so I'll start this about 04:00-5:00 UT, Jan 26. [2007-01-25 22:34, PalmerDivide]

· Starting this as Peter reported snow. Ready for a change according to news from Ondrejov. Adrian [2007-01-25 22:22, Modra] Message sent to BinAstPhotSurvey conference

· Brian's data of the past night nail down the 25.9h period,
http://www.asu.cas.cz/~asteroid/2478.png
Zero points of magnitude scales of sessions no. 2, 4, and 5 are established well with mutual overlaps, the other two sessions will have to be nailed down in magnitude when the coverage is more complete.

There is a good chance that Peter will observe it from here tonight, covering the 0.75-phase event ....

Cheers, Petr [2007-01-25 15:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Clouds came in. Run never started.
Don [2007-01-25 02:39, CarbuncleHill]

· OK, I'll pile on too. The sky is clearer than the forecast indicated, although heavy clouds lurk to the west. I may be able a few hours in before they get here, which should be just about right. I'll target 4951, also, since it's bright enough for a fairly short exposure.
Don [2007-01-24 22:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be working this tonight (Jan 25, 2007, UT). Forecasters say I can get it tomorrow as well. Then we get our weekly snow. [2007-01-24 21:13, PalmerDivide]

· Brian's new data of Jan. 24.4 joined it, the 18.6h period that looked likely yesterday is ruled out now, the preferred solution is 25.9 h now, see
http://www.asu.cas.cz/~asteroid/2478.png
(Those nasty periods near commensurability with 1 day require more data to establish well, especially when session length is limited to <1/4 of the period.) We will see how it is refined with more data. The minima may evolve fast and filling in gaps in coverage outside the minima is needed for a good solution as well, so I encourage observers at different longitudes to help out.

Cheers, Petr [2007-01-24 15:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yes, your Jan. 23.4 data, Brian, support the 18.6h period,
http://www.asu.cas.cz/~asteroid/2478.png
Your new data of the past night should refine it. Covering both events again as well as completing coverage of the rotational lightcurve will require a few more sessions.

Cheers, Petr [2007-01-24 09:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be working this again tonight. Last night (1/23 UT) appeared to catch an event and support the 18.6 hr period. [2007-01-23 22:23, PalmerDivide]

· Assuming it stays clear, I'll start covering this about 05:00 Jan. 23, UT. [2007-01-22 21:25, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Data by David from Hunters Hill of Jan. 20.6 and by Peter K. from here of Jan. 22.1 give a double solution for its period, about 18.6 hours or about 25 hours, a composite for the shorter one see
http://www.asu.cas.cz/~asteroid/2478.png
The suspected satellite is large, but it looks to be not entirely equal size components; Ds/Dp is a little bit less than 1. We will see how the other minimum looks when we cover its respective phases (after resolving the period ambiguity, of course).

Cheers, Petr [2007-01-22 11:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:10 UT (as a complementary target for 4951). Peter K. [2007-01-22 01:26, Ondrejov]

· David's lightcurve
http://www.david-higgins.com/Astronomy/asteroid/images/2478LC.gif
is suspicious, but more data are needed. David is likely to be clouded out, so if someone can help him out and take a long session, it would be appreciated.

Cheers, Petr [2007-01-21 13:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 12:37UT to 17:57UT in hot dry conditions. Target appears to have a large amplitude of at least 0.8 +/- 0.02mag and a period >10hrs. However, it is an unusual shapped plot with 2 hours showing a gentle straight line decline of 0.2mag before plumeting 0.6 mag then rising again over the next 3.5 hours. Almost what one might expect to see in a classic OB star. [2007-01-21 00:41, HuntersHill] Message sent to BinAstPhotSurvey conference

(2227) OttoStruve (Finished) - prime suspect [Add new note]
· Done in 2nd apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-07-10 11:51, Ondrejov]

· Covering this tonight. [2022-11-29 03:01, Shed of Science] Message sent to observers

· Following this one again tonight.

Russ [2022-11-27 22:39, Shed of Science]

· Follwed last night on 11/27. I will likely follow again on 11/28. Russ [2022-11-27 16:37, Shed of Science] Message sent to observers

· Got one night on this. Will continue to follow. [2022-10-29 14:21, Shed of Science] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek observed this new target from Sopot: Unique solution, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/02227.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Vladimir.

Petr [2020-01-09 08:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target tonight.
Vladimir [2020-01-05 22:16, Sopot AO]

(2653) Principia (Finished) [Add new note]
· Done in the 2nd apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-06-30 11:06, Ondrejov]

· Did a run on this last night 1/26 UT. Will cover again tonight.

Russ [2023-01-27 02:20, Shed of Science] Message sent to BinAstPhotSurvey conference

· This new target was observed by Don Pray from Sugarloaf Mountain and by Julian Oey from Leura: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02653.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-07 09:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· data to be combined with Don's. No attenuation noted. Data sent in [2018-12-30 21:38, Blue Mountains Obs]

· started new target [2018-12-30 07:23, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(1523) Pieksamaki (Finished) [Add new note]
· Done in 2nd apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-06-28 11:46, Ondrejov]

· Did a run on this on 1/26 UT. Will also cover tonight.

Russ [2023-01-27 02:05, Shed of Science] Message sent to BinAstPhotSurvey conference

· Don has done this one well from Carbuncle Hill with four long sessions during 12-22.3 to 28.3. Period of 5.320 h (U=3), doubly covered, no deviation seen. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2006-01-02 12:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Attempting third session on this tonight. Looks like 5.3h period. Hopefully, this run will finish it.

Don [2005-12-24 04:33, CarbuncleHill]

(21526) Mirano (Finished) - prime suspect [Add new note]
· This new target was done in its 1st apparition:
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2023-06-12 13:24, Ondrejov]

(2966) Korsunia (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5269, copied below for your convenience.

Cheers, Petr

(2966) KORSUNIA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec and P.
Kusnirak, Ondrejov Observatory; F. Vachier, Observatoire de Paris; and A.
Klotz, P. Thierry, and J. Berthier, Observatoire des Makes, Reunion, report
that photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia and a 0.6-m telescope at the Observatoire des Makes
during Apr. 20-May 23 reveal that minor planet (2966) is a binary system with
an orbital period of 17.521 Â± 0.004 hr. The primary shows a period of
2.31419 Â± 0.00007 hr and has a lightcurve amplitude of 0.12 mag at solar
phases 6-21 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.06 magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.24.

2023 June 6 (CBET 5269) Daniel W. E. Green [2023-06-07 07:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has taken more observations from Sopot for this one. Current preferred solution:
https://www.asu.cas.cz/~asteroid/02966_2023a_porb.png
https://www.asu.cas.cz/~asteroid/02966_2023a_p1.png
(One session, 2023-04-21.9, shows a shallower event than the two later sessions 2023-04-26.9 and 29.9. It may be an observational issue for the sub-optimal observing conditions at Sopot on that night, or it may be a real evolution of the mutual event. More data should show.)

More observations (errors < 0.02 mag) are needed to improve the solution. Event ephemeris for the preferred solution:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 5- 9 0.54 0.257
2023- 5- 9 18.04 0.257
2023- 5-10 11.54 0.257
2023- 5-11 5.04 0.257
2023- 5-11 22.54 0.257
2023- 5-12 16.04 0.257
2023- 5-13 9.54 0.257
2023- 5-14 3.04 0.257
2023- 5-14 20.54 0.257
2023- 5-15 14.04 0.257
2023- 5-16 7.54 0.257
2023- 5-17 1.04 0.257
2023- 5-17 18.54 0.257
2023- 5-18 12.04 0.257
2023- 5-19 5.54 0.257
2023- 5-19 23.04 0.257
2023- 5-20 16.54 0.257
2023- 5-21 10.04 0.257
2023- 5-22 3.54 0.257
2023- 5-22 21.04 0.257
2023- 5-23 14.54 0.257
2023- 5-24 8.04 0.257
2023- 5-25 1.54 0.257
2023- 5-25 19.04 0.257
2023- 5-26 12.54 0.257
2023- 5-27 6.04 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2023- 5- 9 9.16 0.750
2023- 5-10 2.66 0.750
2023- 5-10 20.16 0.750
2023- 5-11 13.66 0.750
2023- 5-12 7.16 0.750
2023- 5-13 0.66 0.750
2023- 5-13 18.16 0.750
2023- 5-14 11.66 0.750
2023- 5-15 5.16 0.750
2023- 5-15 22.66 0.750
2023- 5-16 16.16 0.750
2023- 5-17 9.66 0.750
2023- 5-18 3.16 0.750
2023- 5-18 20.66 0.750
2023- 5-19 14.16 0.750
2023- 5-20 7.66 0.750
2023- 5-21 1.16 0.750
2023- 5-21 18.66 0.750
2023- 5-22 12.16 0.750
2023- 5-23 5.66 0.750
2023- 5-23 23.16 0.750
2023- 5-24 16.66 0.750
2023- 5-25 10.16 0.750
2023- 5-26 3.66 0.750
2023- 5-26 21.16 0.750

Clear Skies, Petr [2023-05-03 07:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. There are several possible values for its orbital period; one of them:
https://www.asu.cas.cz/~asteroid/02966_2023a_porb.png
https://www.asu.cas.cz/~asteroid/02966_2023a_p1.png

More data (errors < 0.02 mag) are needed to nail down it.

Clear Skies, Petr [2023-04-25 06:56, Ondrejov] Message sent to BinAstPhotSurvey conference

(5781) Barkhatova (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5255, copied below for your convenience.

Cheers, Petr

(5781) BARKHATOVA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during Mar. 14-Apr. 12 reveal that minor planet (5781) is a
binary system with an orbital period of 36.04 Â± 0.05 hr. The primary shows
a period of 2.8161 Â± 0.0001 hr and has a lightcurve amplitude of 0.12
magnitude at solar phases 5-19 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.07 to 0.14 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.26.

2023 May 11 (CBET 5255) Daniel W. E. Green [2023-05-12 06:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data for this one taken by Vladimir Benishek and by Russ Durkee. Current solution:
https://www.asu.cas.cz/~asteroid/05781_2023a_porb.png
https://www.asu.cas.cz/~asteroid/05781_2023a_p1.png

More data (errors <= 0.02 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 4- 9 22.01 0.253
2023- 4-11 10.06 0.253
2023- 4-12 22.11 0.253
2023- 4-14 10.16 0.253
2023- 4-15 22.21 0.253
2023- 4-17 10.26 0.253
2023- 4-18 22.31 0.253
2023- 4-20 10.36 0.253
2023- 4-21 22.41 0.253
2023- 4-23 10.46 0.253
2023- 4-24 22.51 0.253
2023- 4-26 10.56 0.253
2023- 4-27 22.61 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2023- 4- 9 3.96 0.753
2023- 4-10 16.01 0.753
2023- 4-12 4.06 0.753
2023- 4-13 16.11 0.753
2023- 4-15 4.16 0.753
2023- 4-16 16.21 0.753
2023- 4-18 4.26 0.753
2023- 4-19 16.31 0.753
2023- 4-21 4.36 0.753
2023- 4-22 16.41 0.753
2023- 4-24 4.46 0.753
2023- 4-25 16.51 0.753
2023- 4-27 4.56 0.753

Clear Skies, Petr [2023-03-30 13:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target on 3 nights, found it to be a binary suspect. A tentative decomposition (may be wrong):
https://www.asu.cas.cz/~asteroid/05781_2023a_p1.png
https://www.asu.cas.cz/~asteroid/05781_2023a_porb.png

More data (errors not greater than 0.02 mag) are needed to confirm it.

Clear Skies, Petr [2023-03-19 11:21, Ondrejov] Message sent to BinAstPhotSurvey conference

(1990) Pilcher (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5244, copied below for your convenience.

Cheers, Petr

(1990) PILCHER
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; M.
Husarik, A. Voitko, D. Tomko, M. Pikler, and G. Cervak, Skalnate Pleso
Observatory; and A. Marchini and R. Papini, Dipartimento di Scienze Fisiche,
Della Terra e Dell'Ambiente, University of Siena, report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia,
a 0.35-m telescope at the Organ Mesa Observatory, 0.61-m and 1.3-m telescopes
at the Skalnate Pleso Observatory, and a 0.30-m telescope at the Astronomical
Observatory of the University of Siena during 2022 Dec. 29-2023 Feb. 20
reveal that minor planet (1990) is a binary system with an orbital period of
17.146 Â± 0.002 hr. The primary shows a period of 2.84096 Â± 0.00007 hr
and has a lightcurve amplitude of 0.11 mag at solar phases 3-9 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.05 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.22.

2023 April 22 (CBET 5244) Daniel W. E. Green [2023-04-24 12:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
https://www.asu.cas.cz/~asteroid/01990_2023a_porb.png
https://www.asu.cas.cz/~asteroid/01990_2023a_p1.png
https://www.asu.cas.cz/~asteroid/01990_2023b_porb.png
https://www.asu.cas.cz/~asteroid/01990_2023b_p1.png
https://www.asu.cas.cz/~asteroid/01990_2023c_porb.png
https://www.asu.cas.cz/~asteroid/01990_2023c_p1.png

Taking more good data (errors < 0.015 mag) would be good before we publish this one on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 3-10 15.32 0.243
2023- 3-11 8.46 0.243
2023- 3-12 1.61 0.243
2023- 3-12 18.75 0.243
2023- 3-13 11.90 0.243
2023- 3-14 5.04 0.243
2023- 3-14 22.19 0.243
2023- 3-15 15.33 0.243
2023- 3-16 8.48 0.243
2023- 3-17 1.62 0.243
2023- 3-17 18.77 0.243
2023- 3-18 11.91 0.243
2023- 3-19 5.06 0.243
2023- 3-19 22.20 0.243
2023- 3-20 15.35 0.243
2023- 3-21 8.49 0.243
2023- 3-22 1.64 0.243
2023- 3-22 18.78 0.243
2023- 3-23 11.93 0.243
2023- 3-24 5.07 0.243
2023- 3-24 22.22 0.243
2023- 3-25 15.36 0.243
2023- 3-26 8.51 0.243
2023- 3-27 1.65 0.243

Date/Time UTC (LTc.) Phase
--------------------------
2023- 3-10 23.88 0.743
2023- 3-11 17.03 0.743
2023- 3-12 10.17 0.743
2023- 3-13 3.32 0.743
2023- 3-13 20.46 0.743
2023- 3-14 13.61 0.743
2023- 3-15 6.75 0.743
2023- 3-15 23.90 0.743
2023- 3-16 17.04 0.743
2023- 3-17 10.19 0.743
2023- 3-18 3.33 0.743
2023- 3-18 20.48 0.743
2023- 3-19 13.62 0.743
2023- 3-20 6.77 0.743
2023- 3-20 23.91 0.743
2023- 3-21 17.06 0.743
2023- 3-22 10.20 0.743
2023- 3-23 3.35 0.743
2023- 3-23 20.49 0.743
2023- 3-24 13.64 0.743
2023- 3-25 6.78 0.743
2023- 3-25 23.93 0.743
2023- 3-26 17.07 0.743
2023- 3-27 10.22 0.743

Clear Skies, Petr [2023-03-07 10:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
https://www.asu.cas.cz/~asteroid/01990_2023a_porb.png
https://www.asu.cas.cz/~asteroid/01990_2023a_p1.png
https://www.asu.cas.cz/~asteroid/01990_2023b_porb.png
https://www.asu.cas.cz/~asteroid/01990_2023b_p1.png

The lightcurve is evolving and it would be good to take more data (errors < 0.015 mag) so that we see how it develops. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 2- 9 8.36 0.242
2023- 2-10 1.50 0.242
2023- 2-10 18.65 0.242
2023- 2-11 11.79 0.242
2023- 2-12 4.94 0.242
2023- 2-12 22.08 0.242
2023- 2-13 15.23 0.242
2023- 2-14 8.37 0.242
2023- 2-15 1.52 0.242
2023- 2-15 18.66 0.242
2023- 2-16 11.81 0.242
2023- 2-17 4.95 0.242
2023- 2-17 22.10 0.242
2023- 2-18 15.24 0.242
2023- 2-19 8.39 0.242
2023- 2-20 1.53 0.242
2023- 2-20 18.68 0.242
2023- 2-21 11.82 0.242
2023- 2-22 4.97 0.242
2023- 2-22 22.11 0.242
2023- 2-23 15.26 0.242
2023- 2-24 8.40 0.242
2023- 2-25 1.55 0.242
2023- 2-25 18.69 0.242
2023- 2-26 11.84 0.242
2023- 2-27 4.98 0.242
2023- 2-27 22.13 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2023- 2- 9 16.97 0.745
2023- 2-10 10.12 0.745
2023- 2-11 3.26 0.745
2023- 2-11 20.41 0.745
2023- 2-12 13.55 0.745
2023- 2-13 6.70 0.745
2023- 2-13 23.84 0.745
2023- 2-14 16.99 0.745
2023- 2-15 10.13 0.745
2023- 2-16 3.28 0.745
2023- 2-16 20.42 0.745
2023- 2-17 13.57 0.745
2023- 2-18 6.71 0.745
2023- 2-18 23.86 0.745
2023- 2-19 17.00 0.745
2023- 2-20 10.15 0.745
2023- 2-21 3.29 0.745
2023- 2-21 20.44 0.745
2023- 2-22 13.58 0.745
2023- 2-23 6.73 0.745
2023- 2-23 23.87 0.745
2023- 2-24 17.02 0.745
2023- 2-25 10.16 0.745
2023- 2-26 3.31 0.745
2023- 2-26 20.45 0.745
2023- 2-27 13.60 0.745

Clear Skies, Petr [2023-02-02 11:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data for this one taken by Marek Husarik from Skalnate Pleso and by Alessandro Marchini and Riccardo Papini from University of Siena. Likely solution:
https://www.asu.cas.cz/~asteroid/01990_2023a_porb.png
https://www.asu.cas.cz/~asteroid/01990_2023a_p1.png

More data (errors < 0.015 mag) are needed to nail down it.

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-16 18.49 0.244
2023- 1-17 11.63 0.244
2023- 1-18 4.77 0.244
2023- 1-18 21.91 0.244
2023- 1-19 15.05 0.244
2023- 1-20 8.19 0.244
2023- 1-21 1.33 0.244
2023- 1-21 18.47 0.244
2023- 1-22 11.61 0.244
2023- 1-23 4.75 0.244
2023- 1-23 21.89 0.244
2023- 1-24 15.03 0.244
2023- 1-25 8.17 0.244
2023- 1-26 1.31 0.244
2023- 1-26 18.45 0.244
2023- 1-27 11.59 0.244
2023- 1-28 4.73 0.244
2023- 1-28 21.87 0.244
2023- 1-29 15.01 0.244
2023- 1-30 8.15 0.244
2023- 1-31 1.29 0.244
2023- 1-31 18.43 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-17 3.07 0.745
2023- 1-17 20.21 0.745
2023- 1-18 13.35 0.745
2023- 1-19 6.49 0.745
2023- 1-19 23.63 0.745
2023- 1-20 16.77 0.745
2023- 1-21 9.91 0.745
2023- 1-22 3.05 0.745
2023- 1-22 20.19 0.745
2023- 1-23 13.33 0.745
2023- 1-24 6.47 0.745
2023- 1-24 23.61 0.745
2023- 1-25 16.75 0.745
2023- 1-26 9.89 0.745
2023- 1-27 3.03 0.745
2023- 1-27 20.17 0.745
2023- 1-28 13.31 0.745
2023- 1-29 6.45 0.745
2023- 1-29 23.59 0.745
2023- 1-30 16.73 0.745
2023- 1-31 9.87 0.745

Clear Skies, Petr [2023-01-16 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/01990_2023a_porb.png
https://www.asu.cas.cz/~asteroid/01990_2023a_p1.png

More data (errors < 0.015 mag) are needed to establish it well.

Happy New Year!

Petr [2023-01-02 15:09, Ondrejov] Message sent to BinAstPhotSurvey conference

(11723) 1998 HT125 [Add new note]
[Send data to: peter@asu.cas.cz ]
· Did one night on this one.

Russ [2023-04-16 19:19, Shed of Science] Message sent to BinAstPhotSurvey conference

(2827) Vellamo - Prime Suspect [Add new note]
[Send data to: peter@asu.cas.cz ]
· Doing a run on this tonight, Mar 20 UT.
Don [2023-03-20 00:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This returned "prime suspect" was observed by Russ Durkee from Shed of Science South, supported with one session by Vladimir Benishek from Sopot. Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02827_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-12-14 11:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing one more night on this one.

Russ [2021-11-12 02:21, Shed of Science] Message sent to observers

· Did a run on this one last night. Will do another tonight.

Russ [2021-10-30 01:11, Shed of Science] Message sent to BinAstPhotSurvey conference

· Russ Durkee observed this return "prime suspect": Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02827_b9.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-11 14:35, Ondrejov]

· Will start about 3UT and run until 9UT on 1/5

Russ [2019-01-04 22:22, Shed of Science] Message sent to observers

· Starting at 3:00 UT 1/1/19 run until about 9UT.

Russ [2019-01-01 03:06, Shed of Science] Message sent to BinAstPhotSurvey conference

(97034) 1999 UK7 (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5232, copied below for your convenience.

Cheers, Petr

(97034) 1999 UK_7
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and A. Marchini and R. Papini, Dipartimento di Scienze Fisiche,
Della Terra e Dell'Ambiente, University of Siena, report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia
and a 0.30-m telescope at the Astronomical Observatory of the University of
Siena during Feb. 15-23 reveal that the Mars-crossing minor planet (97034) is
a binary system with an orbital period of 15.57 Â± 0.03 hr. The primary
shows a period of 2.3757 Â± 0.0005 hr and has a lightcurve amplitude of 0.06
mag at solar phases 14-20 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.06 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.24.

2023 March 12 (CBET 5232) Daniel W. E. Green [2023-03-13 08:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot on 4 nights, found it to be a binary suspect. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/97034_2023a_porb.png
https://www.asu.cas.cz/~asteroid/97034_2023a_p1.png

More data (errors < 0.015 mag) are needed to establish it well.

Clear Skies, Petr [2023-02-20 09:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Worked this new target on 3 nights.
Vladimir [2023-02-18 00:15, Sopot AO]

(118303) 1998 UG (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5223, copied below for your convenience.

Cheers, Petr

(118303) 1998 UG
V. Benishek, Belgrade Astronomical Observatory; and P. Pravec, Ondrejov
Observatory, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia during 2022 Nov. 29-2023 Jan. 2
reveal that minor planet (118303) is a binary system with an orbital period
of 35.69 Â± 0.04 hr. The primary shows a period of 3.3545 Â± 0.0003 hr and
has a lightcurve amplitude of 0.11 mag at solar phases 15-16 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.08 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.28.

2023 February 20 (CBET 5223) Daniel W. E. Green [2023-02-22 09:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken by Vladimir Benishek for this one. A likely solution:
https://www.asu.cas.cz/~asteroid/118303_2022b_porb.png
https://www.asu.cas.cz/~asteroid/118303_2022b_p1.png
https://www.asu.cas.cz/~asteroid/118303_2022a_porb.png
https://www.asu.cas.cz/~asteroid/118303_2022a_p1.png

More data (errors < 0.02 mag) are needed to nail it down. Event ephemeris for the likely solution (but don't limit your observations just around the predicted mid-event times):

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-10 19.95 0.251
2023- 1-12 7.65 0.251
2023- 1-13 19.35 0.251
2023- 1-15 7.05 0.251
2023- 1-16 18.75 0.251
2023- 1-18 6.45 0.251
2023- 1-19 18.15 0.251
2023- 1-21 5.85 0.251
2023- 1-22 17.55 0.251
2023- 1-24 5.25 0.251
2023- 1-25 16.95 0.251
2023- 1-27 4.65 0.251
2023- 1-28 16.35 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-10 2.08 0.751
2023- 1-11 13.78 0.751
2023- 1-13 1.48 0.751
2023- 1-14 13.18 0.751
2023- 1-16 0.88 0.751
2023- 1-17 12.58 0.751
2023- 1-19 0.28 0.751
2023- 1-20 11.98 0.751
2023- 1-21 23.68 0.751
2023- 1-23 11.38 0.751
2023- 1-24 23.08 0.751
2023- 1-26 10.78 0.751
2023- 1-27 22.48 0.751

Clear Skies, Petr [2023-01-05 14:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot on four nights, found it to be a binary suspect. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/118303_2022a_porb.png
https://www.asu.cas.cz/~asteroid/118303_2022a_p1.png
(Note: The period in the porb plot above was set just for the plotting purpose. There is no real solution for P_orb yet.)

More observations (errors < 0.02 mag) are needed to confirm it. Vladimir would appreciate a help by others, as the weather on his station is mostly poor these nights.

Clear Skies, Petr [2022-12-15 12:35, Ondrejov] Message sent to BinAstPhotSurvey conference

(1857) Parchomenko - binary candidate, more data needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· Vladimir Benishek has observed this binary candidate (Stephens et al. 2006) from Sopot on 10 nights in its current apparition so far, catched apparent events. A tentative decomposition:
https://www.asu.cas.cz/~asteroid/01857_2023a_porb.png
https://www.asu.cas.cz/~asteroid/01857_2023a_p1.png
https://www.asu.cas.cz/~asteroid/01857_2023b_porb.png
https://www.asu.cas.cz/~asteroid/01857_2023b_p1.png
(Note: The period in the porb plots above was set just for plotting purpose. No meaningful P_orb has been estimated yet.)

Vladimir would appreciate a help with this one. Data with errors not greater than 0.015 mag are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2023-02-16 11:51, Ondrejov] Message sent to BinAstPhotSurvey conference

(3959) Irwin (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5219, copied below for your convenience.

Cheers, Petr

(3959) IRWIN
V. Benishek, Belgrade Astronomical Observatory; F. Salvaggio and
R. Papini, Wild Boar Remote Observatory, Florence, Italy; A. Marchini,
Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of
Siena; P. Pravec, Ondrejov Observatory; F. Pilcher, Organ Mesa Observatory,
Las Cruces, NM, U.S.A.; and R. Durkee, Shed of Science South Observatory,
Pontotoc, TX, U.S.A., report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia, a 0.23-m telescope at the Wild
Boar Remote Observatory, a 0.30-m telescope at the Astronomical Observatory of
the University of Siena, a 0.35-m telescope at the Organ Mesa Observatory, and
a 0.50-m telescope at the Shed of Science South Observatory during 2022 Nov.
14-Dec. 24 reveal that minor planet (3959) is a binary system with an orbital
period of 15.641 Â± 0.004 hr. The primary shows a period of 3.2591 Â±
0.0003 hr and has a lightcurve amplitude of 0.11 mag at solar phases 3-10
degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.09 to 0.18 magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.29.

2021 February 9 (CBET 5219) Daniel W. E. Green [2023-02-10 11:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
https://www.asu.cas.cz/~asteroid/03959_2022a_porb.png
https://www.asu.cas.cz/~asteroid/03959_2022a_p1.png
https://www.asu.cas.cz/~asteroid/03959_2022b_porb.png
https://www.asu.cas.cz/~asteroid/03959_2022b_p1.png

More data (errors < 0.02 mag) would be good to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-10 10.98 0.261
2023- 1-11 2.61 0.261
2023- 1-11 18.25 0.261
2023- 1-12 9.89 0.261
2023- 1-13 1.53 0.261
2023- 1-13 17.17 0.261
2023- 1-14 8.81 0.261
2023- 1-15 0.45 0.261
2023- 1-15 16.09 0.261
2023- 1-16 7.73 0.261
2023- 1-16 23.37 0.261
2023- 1-17 15.00 0.261
2023- 1-18 6.64 0.261
2023- 1-18 22.28 0.261
2023- 1-19 13.92 0.261
2023- 1-20 5.56 0.261
2023- 1-20 21.20 0.261
2023- 1-21 12.84 0.261
2023- 1-22 4.48 0.261
2023- 1-22 20.12 0.261
2023- 1-23 11.76 0.261
2023- 1-24 3.39 0.261
2023- 1-24 19.03 0.261
2023- 1-25 10.67 0.261
2023- 1-26 2.31 0.261
2023- 1-26 17.95 0.261
2023- 1-27 9.59 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-10 2.95 0.748
2023- 1-10 18.59 0.748
2023- 1-11 10.23 0.748
2023- 1-12 1.87 0.748
2023- 1-12 17.51 0.748
2023- 1-13 9.14 0.748
2023- 1-14 0.78 0.748
2023- 1-14 16.42 0.748
2023- 1-15 8.06 0.748
2023- 1-15 23.70 0.748
2023- 1-16 15.34 0.748
2023- 1-17 6.98 0.748
2023- 1-17 22.62 0.748
2023- 1-18 14.26 0.748
2023- 1-19 5.90 0.748
2023- 1-19 21.53 0.748
2023- 1-20 13.17 0.748
2023- 1-21 4.81 0.748
2023- 1-21 20.45 0.748
2023- 1-22 12.09 0.748
2023- 1-23 3.73 0.748
2023- 1-23 19.37 0.748
2023- 1-24 11.01 0.748
2023- 1-25 2.65 0.748
2023- 1-25 18.29 0.748
2023- 1-26 9.92 0.748
2023- 1-27 1.56 0.748
2023- 1-27 17.20 0.748

Clear Skies, Petr [2023-01-03 11:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was found to be a binary suspect by Vladimir Benishek from Sopot and independently by Alessandro Marchini, Riccardo Papini and Fabio Salvaggio from Siena and WBRO Florence. A combination of their two datasets gives what appears to be a unique solution:
https://www.asu.cas.cz/~asteroid/03959_2022a_porb.png
https://www.asu.cas.cz/~asteroid/03959_2022a_p1.png

More data (errors < 0.02 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-12-11 11.57 0.254
2022-12-12 3.21 0.254
2022-12-12 18.85 0.254
2022-12-13 10.49 0.254
2022-12-14 2.13 0.254
2022-12-14 17.77 0.254
2022-12-15 9.41 0.254
2022-12-16 1.05 0.254
2022-12-16 16.69 0.254
2022-12-17 8.33 0.254
2022-12-17 23.97 0.254
2022-12-18 15.61 0.254
2022-12-19 7.25 0.254
2022-12-19 22.89 0.254
2022-12-20 14.53 0.254
2022-12-21 6.17 0.254
2022-12-21 21.81 0.254
2022-12-22 13.45 0.254
2022-12-23 5.09 0.254
2022-12-23 20.73 0.254
2022-12-24 12.37 0.254
2022-12-25 4.01 0.254
2022-12-25 19.65 0.254
2022-12-26 11.29 0.254
2022-12-27 2.93 0.254
2022-12-27 18.57 0.254
2022-12-28 10.21 0.254
2022-12-29 1.85 0.254
2022-12-29 17.49 0.254
2022-12-30 9.13 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2022-12-11 3.69 0.750
2022-12-11 19.33 0.750
2022-12-12 10.97 0.750
2022-12-13 2.61 0.750
2022-12-13 18.25 0.750
2022-12-14 9.89 0.750
2022-12-15 1.53 0.750
2022-12-15 17.17 0.750
2022-12-16 8.81 0.750
2022-12-17 0.45 0.750
2022-12-17 16.09 0.750
2022-12-18 7.73 0.750
2022-12-18 23.37 0.750
2022-12-19 15.01 0.750
2022-12-20 6.65 0.750
2022-12-20 22.29 0.750
2022-12-21 13.93 0.750
2022-12-22 5.57 0.750
2022-12-22 21.21 0.750
2022-12-23 12.85 0.750
2022-12-24 4.49 0.750
2022-12-24 20.13 0.750
2022-12-25 11.77 0.750
2022-12-26 3.41 0.750
2022-12-26 19.05 0.750
2022-12-27 10.69 0.750
2022-12-28 2.33 0.750
2022-12-28 17.97 0.750
2022-12-29 9.61 0.750
2022-12-30 1.25 0.750
2022-12-30 16.89 0.750

Clear Skies, Petr [2022-12-06 11:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target on Nov. 13-14 UT.
Vladimir [2022-11-16 03:18, Sopot AO]

(2871) Schober (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5215, copied below for your convenience.

Cheers, Petr

(2871) SCHOBER
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.,
report that photometric observations taken with a 0.35-m telescope at the
Sopot Observatory in Serbia and a 0.35-m telescope at the Organ Mesa
Observatory during 2022 Oct. 18-Nov. 3 reveal that minor planet (2871) is a
binary system with an orbital period of 42.47 Â± 0.02 hr. The primary shows
a period of 2.85219 Â± 0.00009 hr and has a lightcurve amplitude of 0.17 mag
at solar phase 2 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.08 magnitude deep indicate a lower
limit on the secondary-to-primary mean-diameter ratio of 0.28.

2023 February 3 (CBET 5215) Daniel W. E. Green [2023-02-06 09:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current data for this one:
https://www.asu.cas.cz/~asteroid/02871_2022a_porb.png
https://www.asu.cas.cz/~asteroid/02871_2022a_p1.png
https://www.asu.cas.cz/~asteroid/02871_2022b_porb.png
https://www.asu.cas.cz/~asteroid/02871_2022b_p1.png
https://www.asu.cas.cz/~asteroid/02871_2022c_porb.png
https://www.asu.cas.cz/~asteroid/02871_2022c_p1.png

More data (errors <= 0.015 mag) would be good to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-11 0.36 0.250
2023- 1-12 18.83 0.250
2023- 1-14 13.30 0.250
2023- 1-16 7.77 0.250
2023- 1-18 2.24 0.250
2023- 1-19 20.71 0.250
2023- 1-21 15.18 0.250
2023- 1-23 9.65 0.250
2023- 1-25 4.12 0.250
2023- 1-26 22.59 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-10 2.98 0.747
2023- 1-11 21.45 0.747
2023- 1-13 15.92 0.747
2023- 1-15 10.39 0.747
2023- 1-17 4.86 0.747
2023- 1-18 23.33 0.747
2023- 1-20 17.80 0.747
2023- 1-22 12.27 0.747
2023- 1-24 6.74 0.747
2023- 1-26 1.21 0.747

Clear Skies, Petr [2023-01-02 14:26, Ondrejov]

· Current data for this one:
https://www.asu.cas.cz/~asteroid/02871_2022a_porb.png
https://www.asu.cas.cz/~asteroid/02871_2022a_p1.png
https://www.asu.cas.cz/~asteroid/02871_2022b_porb.png
https://www.asu.cas.cz/~asteroid/02871_2022b_p1.png
https://www.asu.cas.cz/~asteroid/02871_2022c_porb.png
https://www.asu.cas.cz/~asteroid/02871_2022c_p1.png

More data (errors <= 0.015 mag) are needed to improve it. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-12-11 22.12 0.244
2022-12-13 16.59 0.244
2022-12-15 11.06 0.244
2022-12-17 5.53 0.244
2022-12-18 24.00 0.244
2022-12-20 18.47 0.244
2022-12-22 12.94 0.244
2022-12-24 7.41 0.244
2022-12-26 1.88 0.244
2022-12-27 20.35 0.244
2022-12-29 14.82 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2022-12-12 19.33 0.744
2022-12-14 13.80 0.744
2022-12-16 8.27 0.744
2022-12-18 2.74 0.744
2022-12-19 21.21 0.744
2022-12-21 15.68 0.744
2022-12-23 10.15 0.744
2022-12-25 4.62 0.744
2022-12-26 23.09 0.744
2022-12-28 17.56 0.744

Clear Skies, Petr [2022-12-06 14:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this one by Vladimir Benishek and by Frederick Pilcher. Current solution:
https://www.asu.cas.cz/~asteroid/02871_2022a_porb.png
https://www.asu.cas.cz/~asteroid/02871_2022a_p1.png

More data (errors <= 0.15 mag) are needed to improve it. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-11- 3 0.28 0.252
2022-11- 4 18.78 0.252
2022-11-13 15.28 0.252
2022-11-15 9.78 0.252
2022-11-17 4.28 0.252
2022-11-18 22.78 0.252
2022-11-20 17.28 0.252
2022-11-22 11.78 0.252
2022-11-24 6.28 0.252
2022-11-26 0.78 0.252
2022-11-27 19.28 0.252
2022-11-29 13.78 0.252
2022-12- 1 8.28 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2022-11- 2 2.76 0.746
2022-11- 3 21.26 0.746
2022-11-12 17.76 0.746
2022-11-14 12.26 0.746
2022-11-16 6.76 0.746
2022-11-18 1.26 0.746
2022-11-19 19.76 0.746
2022-11-21 14.26 0.746
2022-11-23 8.76 0.746
2022-11-25 3.26 0.746
2022-11-26 21.76 0.746
2022-11-28 16.26 0.746
2022-11-30 10.76 0.746

Clear Skies, Petr [2022-11-01 12:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. A candidate solution:
https://www.asu.cas.cz/~asteroid/02871_2022a_porb.png
https://www.asu.cas.cz/~asteroid/02871_2022a_p1.png

More data (errors < 0.015 mag) are needed to establish it well. Event ephemeris for the candidate solution:

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-21 14.15 0.241
2022-10-22 18.29 0.241
2022-10-23 22.43 0.241
2022-10-25 2.57 0.241
2022-10-26 6.71 0.241
2022-10-27 10.85 0.241
2022-10-28 14.99 0.241
2022-10-29 19.13 0.241
2022-10-30 23.27 0.241
2022-11- 1 3.41 0.241
2022-11- 2 7.55 0.241
2022-11- 3 11.69 0.241
2022-11- 4 15.83 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-22 4.59 0.754
2022-10-23 8.73 0.754
2022-10-24 12.87 0.754
2022-10-25 17.01 0.754
2022-10-26 21.15 0.754
2022-10-28 1.29 0.754
2022-10-29 5.43 0.754
2022-10-30 9.57 0.754
2022-10-31 13.71 0.754
2022-11- 1 17.85 0.754
2022-11- 2 21.99 0.754
2022-11- 4 2.13 0.754

Clear Skies, Petr [2022-10-21 10:29, Ondrejov] Message sent to BinAstPhotSurvey conference

(2037) Tripaxeptalis (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5213, copied below for your convenience.

Cheers, Petr

(2037) TRIPAXEPTALIS
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during 2022 Oct. 28-Dec. 1 reveal that minor planet (2037)
is a binary system with an orbital period of 26.25 Â± 0.02 hr. The primary
shows a period of 2.49535 Â± 0.00006 hr and has a lightcurve amplitude of
0.12 magnitude at solar phases 4-16 degrees, suggesting a nearly spheroidal
shape. Mutual eclipse/occultation events that are 0.05 to 0.10 magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.22 Â± 0.02.

2023 February 2 (CBET 5213) Daniel W. E. Green [2023-02-02 09:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current data for this one:
https://www.asu.cas.cz/~asteroid/02037_2022a_porb.png
https://www.asu.cas.cz/~asteroid/02037_2022a_p1.png

More data (errors not greater than 0.015 mag) would be good to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-10 13.92 0.256
2023- 1-11 16.17 0.256
2023- 1-12 18.42 0.256
2023- 1-13 20.67 0.256
2023- 1-14 22.92 0.256
2023- 1-16 1.17 0.256
2023- 1-17 3.42 0.256
2023- 1-18 5.67 0.256
2023- 1-19 7.92 0.256
2023- 1-20 10.17 0.256
2023- 1-21 12.42 0.256
2023- 1-22 14.67 0.256
2023- 1-23 16.92 0.256
2023- 1-24 19.17 0.256
2023- 1-25 21.42 0.256
2023- 1-26 23.67 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2023- 1-10 1.01 0.764
2023- 1-11 3.26 0.764
2023- 1-12 5.51 0.764
2023- 1-13 7.76 0.764
2023- 1-14 10.01 0.764
2023- 1-15 12.26 0.764
2023- 1-16 14.51 0.764
2023- 1-17 16.76 0.764
2023- 1-18 19.01 0.764
2023- 1-19 21.26 0.764
2023- 1-20 23.51 0.764
2023- 1-22 1.76 0.764
2023- 1-23 4.01 0.764
2023- 1-24 6.26 0.764
2023- 1-25 8.51 0.764
2023- 1-26 10.76 0.764
2023- 1-27 13.01 0.764

Clear Skies, Petr [2023-01-02 13:14, Ondrejov]

· Current data for this one:
https://www.asu.cas.cz/~asteroid/02037_2022a_porb.png
https://www.asu.cas.cz/~asteroid/02037_2022a_p1.png

More data (errors not greater than 0.015 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-12-12 1.15 0.255
2022-12-13 3.40 0.255
2022-12-14 5.65 0.255
2022-12-15 7.90 0.255
2022-12-16 10.15 0.255
2022-12-17 12.40 0.255
2022-12-18 14.65 0.255
2022-12-19 16.90 0.255
2022-12-20 19.15 0.255
2022-12-21 21.40 0.255
2022-12-22 23.65 0.255
2022-12-24 1.90 0.255
2022-12-25 4.15 0.255
2022-12-26 6.40 0.255
2022-12-27 8.65 0.255
2022-12-28 10.90 0.255
2022-12-29 13.15 0.255
2022-12-30 15.40 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2022-12-11 12.29 0.765
2022-12-12 14.54 0.765
2022-12-13 16.79 0.765
2022-12-14 19.04 0.765
2022-12-15 21.29 0.765
2022-12-16 23.54 0.765
2022-12-18 1.79 0.765
2022-12-19 4.04 0.765
2022-12-20 6.29 0.765
2022-12-21 8.54 0.765
2022-12-22 10.79 0.765
2022-12-23 13.04 0.765
2022-12-24 15.29 0.765
2022-12-25 17.54 0.765
2022-12-26 19.79 0.765
2022-12-27 22.04 0.765
2022-12-29 0.29 0.765
2022-12-30 2.54 0.765

Clear Skies, Petr [2022-12-06 13:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this on 11/27, hoping to cover the 0.75 event.

Russ [2022-11-27 16:24, Shed of Science] Message sent to observers

· Vladimir Benishek has taken more data for this one. Current solution:
https://www.asu.cas.cz/~asteroid/02037_2022a_porb.png
https://www.asu.cas.cz/~asteroid/02037_2022a_p1.png

More data (errors not greater than 0.015 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-11-25 15.17 0.258
2022-11-26 17.39 0.258
2022-11-27 19.61 0.258
2022-11-28 21.83 0.258
2022-11-30 0.05 0.258
2022-12- 1 2.27 0.258
2022-12- 2 4.49 0.258
2022-12- 3 6.71 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2022-11-26 4.08 0.751
2022-11-27 6.30 0.751
2022-11-28 8.52 0.751
2022-11-29 10.74 0.751
2022-11-30 12.96 0.751
2022-12- 1 15.18 0.751
2022-12- 2 17.40 0.751
2022-12- 3 19.62 0.751

Clear Skies, Petr [2022-11-25 11:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A likely solution:
https://www.asu.cas.cz/~asteroid/02037_2022a_porb.png
https://www.asu.cas.cz/~asteroid/02037_2022a_p1.png

More data (errors < 0.015 mag) are needed to nail it down. Event ephemeris for the likely solution:

Date/Time UTC (LTc.) Phase
--------------------------
2022-11- 2 3.73 0.250
2022-11- 3 6.13 0.250
2022-11- 4 8.53 0.250
2022-11- 5 10.93 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022-11- 1 14.51 0.750
2022-11- 2 16.91 0.750
2022-11- 3 19.31 0.750
2022-11- 4 21.71 0.750

Clear Skies, Petr [2022-11-01 12:25, Ondrejov] Message sent to BinAstPhotSurvey conference

(2923) Schuyler [Add new note]
[Send data to: peter@asu.cas.cz ]
· Starting another run on this tonight. [2023-01-18 02:58, Shed of Science] Message sent to observers

· Started one night on this new object.

Russ [2023-01-13 12:04, Shed of Science] Message sent to BinAstPhotSurvey conference

(10044) Squyres (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5202, copied below for your convenience.

Cheers, Petr

(10044) SQUYRES
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during 2022 Aug. 12-Nov. 30 reveal that minor planet (10044)
is a binary system with an orbital period of 18.67 Â± 0.01 hr. The primary
shows a period of 3.3356 Â± 0.0005 hr and has a lightcurve amplitude of 0.10
magnitude at solar phases 17-18 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.08 to 0.16 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.28.

2023 January 4 (CBET 5202) Daniel W. E. Green [2023-01-05 09:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current solution for this one:
https://www.asu.cas.cz/~asteroid/10044_2022a_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022a_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022b_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022b_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022c_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022c_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022d_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022d_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022e_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022e_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022f_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022f_p1.png

It would be good to improve the solution with last good data (errors not greater than 0.015 mag) before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-12-11 6.87 0.265
2022-12-12 1.54 0.265
2022-12-12 20.21 0.265
2022-12-13 14.88 0.265
2022-12-14 9.55 0.265
2022-12-15 4.23 0.265
2022-12-15 22.90 0.265
2022-12-16 17.57 0.265
2022-12-17 12.24 0.265
2022-12-18 6.91 0.265
2022-12-19 1.59 0.265
2022-12-19 20.26 0.265
2022-12-20 14.93 0.265
2022-12-21 9.60 0.265
2022-12-22 4.27 0.265
2022-12-22 22.95 0.265
2022-12-23 17.62 0.265
2022-12-24 12.29 0.265
2022-12-25 6.96 0.265
2022-12-26 1.63 0.265
2022-12-26 20.31 0.265
2022-12-27 14.98 0.265
2022-12-28 9.65 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2022-12-11 16.03 0.756
2022-12-12 10.70 0.756
2022-12-13 5.37 0.756
2022-12-14 0.04 0.756
2022-12-14 18.72 0.756
2022-12-15 13.39 0.756
2022-12-16 8.06 0.756
2022-12-17 2.73 0.756
2022-12-17 21.40 0.756
2022-12-18 16.08 0.756
2022-12-19 10.75 0.756
2022-12-20 5.42 0.756
2022-12-21 0.09 0.756
2022-12-21 18.76 0.756
2022-12-22 13.44 0.756
2022-12-23 8.11 0.756
2022-12-24 2.78 0.756
2022-12-24 21.45 0.756
2022-12-25 16.12 0.756
2022-12-26 10.80 0.756
2022-12-27 5.47 0.756
2022-12-28 0.14 0.756
2022-12-28 18.81 0.756

Clear Skies, Petr [2022-12-06 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying this one again tonight.

Russ [2022-11-29 03:01, Shed of Science] Message sent to observers

· Will start this one tonight to try to catch the 0.75 event.

Russ [2022-11-27 22:38, Shed of Science]

· Current solution for this one:
https://www.asu.cas.cz/~asteroid/10044_2022a_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022a_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022b_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022b_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022c_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022c_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022d_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022d_p1.png

It still needs to be improved with more good data (errors not greater than 0.015 mag) before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-11-11 17.33 0.265
2022-11-12 12.00 0.265
2022-11-13 6.67 0.265
2022-11-14 1.35 0.265
2022-11-14 20.02 0.265
2022-11-15 14.69 0.265
2022-11-16 9.36 0.265
2022-11-17 4.03 0.265
2022-11-17 22.71 0.265
2022-11-18 17.38 0.265
2022-11-19 12.05 0.265
2022-11-20 6.72 0.265
2022-11-21 1.39 0.265
2022-11-21 20.07 0.265
2022-11-22 14.74 0.265
2022-11-23 9.41 0.265
2022-11-24 4.08 0.265
2022-11-24 22.75 0.265
2022-11-25 17.43 0.265
2022-11-26 12.10 0.265
2022-11-27 6.77 0.265
2022-11-28 1.44 0.265
2022-11-28 20.11 0.265
2022-11-29 14.79 0.265
2022-11-30 9.46 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2022-11-12 2.67 0.765
2022-11-12 21.35 0.765
2022-11-13 16.02 0.765
2022-11-14 10.69 0.765
2022-11-15 5.36 0.765
2022-11-16 0.03 0.765
2022-11-16 18.71 0.765
2022-11-17 13.38 0.765
2022-11-18 8.05 0.765
2022-11-19 2.72 0.765
2022-11-19 21.39 0.765
2022-11-20 16.07 0.765
2022-11-21 10.74 0.765
2022-11-22 5.41 0.765
2022-11-23 0.08 0.765
2022-11-23 18.75 0.765
2022-11-24 13.43 0.765
2022-11-25 8.10 0.765
2022-11-26 2.77 0.765
2022-11-26 21.44 0.765
2022-11-27 16.11 0.765
2022-11-28 10.79 0.765
2022-11-29 5.46 0.765
2022-11-30 0.13 0.765
2022-11-30 18.80 0.765

Clear Skies, Petr [2022-11-09 11:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current solution for this one:
https://www.asu.cas.cz/~asteroid/10044_2022a_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022a_p1.png
https://www.asu.cas.cz/~asteroid/10044_2022b_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022b_p1.png

It is still somewhat "unstable" and needs to be improved with more good data (errors not greater than 0.015 mag). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-13 4.15 0.261
2022-10-13 22.83 0.261
2022-10-14 17.51 0.261
2022-10-15 12.19 0.261
2022-10-16 6.87 0.261
2022-10-17 1.55 0.261
2022-10-17 20.23 0.261
2022-10-18 14.91 0.261
2022-10-19 9.59 0.261
2022-10-20 4.27 0.261
2022-10-20 22.95 0.261
2022-10-21 17.63 0.261
2022-10-22 12.31 0.261
2022-10-23 6.99 0.261
2022-10-24 1.67 0.261
2022-10-24 20.35 0.261
2022-10-25 15.03 0.261
2022-10-26 9.71 0.261
2022-10-27 4.39 0.261
2022-10-27 23.07 0.261
2022-10-28 17.75 0.261
2022-10-29 12.43 0.261
2022-10-30 7.11 0.261
2022-10-31 1.79 0.261
2022-10-31 20.47 0.261
2022-11- 1 15.15 0.261
2022-11- 2 9.83 0.261
2022-11- 3 4.51 0.261
2022-11- 3 23.19 0.261
2022-11- 4 17.87 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-13 13.41 0.757
2022-10-14 8.09 0.757
2022-10-15 2.77 0.757
2022-10-15 21.45 0.757
2022-10-16 16.13 0.757
2022-10-17 10.81 0.757
2022-10-18 5.49 0.757
2022-10-19 0.17 0.757
2022-10-19 18.85 0.757
2022-10-20 13.53 0.757
2022-10-21 8.21 0.757
2022-10-22 2.89 0.757
2022-10-22 21.57 0.757
2022-10-23 16.25 0.757
2022-10-24 10.93 0.757
2022-10-25 5.61 0.757
2022-10-26 0.29 0.757
2022-10-26 18.97 0.757
2022-10-27 13.65 0.757
2022-10-28 8.33 0.757
2022-10-29 3.01 0.757
2022-10-29 21.69 0.757
2022-10-30 16.37 0.757
2022-10-31 11.05 0.757
2022-11- 1 5.73 0.757
2022-11- 2 0.41 0.757
2022-11- 2 19.09 0.757
2022-11- 3 13.77 0.757
2022-11- 4 8.45 0.757

Clear Skies, Petr [2022-10-11 13:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A likely solution:
https://www.asu.cas.cz/~asteroid/10044_2022a_porb.png
https://www.asu.cas.cz/~asteroid/10044_2022a_p1.png

More data (errors not greater than 0.015 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-23 17.17 0.262
2022- 9-24 11.85 0.262
2022- 9-25 6.53 0.262
2022- 9-26 1.21 0.262
2022- 9-26 19.89 0.262
2022- 9-27 14.57 0.262
2022- 9-28 9.25 0.262
2022- 9-29 3.93 0.262
2022- 9-29 22.61 0.262
2022- 9-30 17.29 0.262
2022-10- 1 11.97 0.262
2022-10- 2 6.65 0.262
2022-10- 3 1.33 0.262
2022-10- 3 20.01 0.262
2022-10- 4 14.69 0.262
2022-10- 5 9.37 0.262
2022-10- 6 4.05 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-24 2.29 0.750
2022- 9-24 20.97 0.750
2022- 9-25 15.65 0.750
2022- 9-26 10.33 0.750
2022- 9-27 5.01 0.750
2022- 9-27 23.69 0.750
2022- 9-28 18.37 0.750
2022- 9-29 13.05 0.750
2022- 9-30 7.73 0.750
2022-10- 1 2.41 0.750
2022-10- 1 21.09 0.750
2022-10- 2 15.77 0.750
2022-10- 3 10.45 0.750
2022-10- 4 5.13 0.750
2022-10- 4 23.81 0.750
2022-10- 5 18.49 0.750
2022-10- 6 13.17 0.750

Clear Skies, Petr [2022-09-23 07:19, Ondrejov] Message sent to BinAstPhotSurvey conference

(19281) 1996 AP3 (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5192, copied below for your convenience.

Cheers, Petr

(19281) 1996 AP_3
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, P. Fatka, K.
Hornoch, and P. Kusnirak, Ondrejov Observatory; P. Bacci and M. Maestripieri,
Astronomical Observatory, San Marcello Pistoiese, Italy; A. Marchini and R.
Papini, Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente,
University of Siena; and D. Pray, Sugarloaf Mountain Observatory, South
Deerfield, MA, U.S.A., report that photometric observations taken with a
0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope at
Ondrejov Observatory, a 0.60-m telescope at the San Marcello Pistoiese
Observatory, a 0.30-m telescope at the Astronomical Observatory of the
University of Siena, and a 0.50-m telescope at the Sugarloaf Mountain
Observatory during June 30-Aug. 4 reveal that minor planet (19281) is a
binary system with an orbital period of 22.27 Â± 0.01 hr. The primary shows
a period of 2.37256 Â± 0.00010 hr and has a lightcurve amplitude of 0.17 mag
at solar phases 5-20 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.07 magnitude deep indicate a lower
limit on the secondary-to-primary mean-diameter ratio of 0.26. The secondary
appears synchronous and has a light-curve amplitude (in the combined primary-
plus-secondary light curve) of 0.02 mag, suggesting a moderately elongated
shape with an equatorial-axis ratio of 1.3 Â± 0.1. The mean absolute
magnitude in the Cousins R photometric system is H_R = 13.41 Â± 0.08,
assuming the phase-relation slope parameter G = 0.24 Â± 0.11.

2022 November 20 (CBET 5192) Daniel W. E. Green [2022-11-21 12:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· It would be good to take final data for this one before we publish it on CBET. Errors <= 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-14 19.09 0.247
2022-10-15 17.36 0.247
2022-10-16 15.63 0.247
2022-10-17 13.90 0.247
2022-10-18 12.17 0.247
2022-10-19 10.44 0.247
2022-10-20 8.71 0.247
2022-10-21 6.98 0.247
2022-10-22 5.25 0.247
2022-10-23 3.52 0.247
2022-10-24 1.79 0.247
2022-10-25 0.06 0.247
2022-10-25 22.33 0.247
2022-10-26 20.60 0.247
2022-10-27 18.87 0.247
2022-10-28 17.14 0.247
2022-10-29 15.41 0.247
2022-10-30 13.68 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-15 6.36 0.754
2022-10-16 4.63 0.754
2022-10-17 2.90 0.754
2022-10-18 1.17 0.754
2022-10-18 23.44 0.754
2022-10-19 21.71 0.754
2022-10-20 19.98 0.754
2022-10-21 18.25 0.754
2022-10-22 16.52 0.754
2022-10-23 14.79 0.754
2022-10-24 13.06 0.754
2022-10-25 11.33 0.754
2022-10-26 9.60 0.754
2022-10-27 7.87 0.754
2022-10-28 6.14 0.754
2022-10-29 4.41 0.754
2022-10-30 2.68 0.754

Clear Skies, Petr [2022-10-14 13:15, Ondrejov]

· Our current data for this one:
https://www.asu.cas.cz/~asteroid/19281_2022a_porb.png
https://www.asu.cas.cz/~asteroid/19281_2022a_p1.png

It would be good to take final data for it before we publish it on CBET. Errors <= 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-14 4.24 0.250
2022- 9-15 2.51 0.250
2022- 9-16 0.78 0.250
2022- 9-16 23.05 0.250
2022- 9-17 21.32 0.250
2022- 9-18 19.59 0.250
2022- 9-19 17.86 0.250
2022- 9-20 16.13 0.250
2022- 9-21 14.40 0.250
2022- 9-22 12.67 0.250
2022- 9-23 10.94 0.250
2022- 9-24 9.21 0.250
2022- 9-25 7.48 0.250
2022- 9-26 5.75 0.250
2022- 9-27 4.02 0.250
2022- 9-28 2.29 0.250
2022- 9-29 0.56 0.250
2022- 9-29 22.83 0.250
2022- 9-30 21.10 0.250
2022-10- 1 19.37 0.250
2022-10- 2 17.64 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-13 17.21 0.755
2022- 9-14 15.48 0.755
2022- 9-15 13.75 0.755
2022- 9-16 12.02 0.755
2022- 9-17 10.29 0.755
2022- 9-18 8.56 0.755
2022- 9-19 6.83 0.755
2022- 9-20 5.10 0.755
2022- 9-21 3.37 0.755
2022- 9-22 1.64 0.755
2022- 9-22 23.91 0.755
2022- 9-23 22.18 0.755
2022- 9-24 20.45 0.755
2022- 9-25 18.72 0.755
2022- 9-26 16.99 0.755
2022- 9-27 15.26 0.755
2022- 9-28 13.53 0.755
2022- 9-29 11.80 0.755
2022- 9-30 10.07 0.755
2022-10- 1 8.34 0.755
2022-10- 2 6.61 0.755

Clear Skies, Petr [2022-09-06 11:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data by Vladimir Benishek and by Paolo Bacci and Martina Maestripieri. Current solution:
https://www.asu.cas.cz/~asteroid/19281_2022a_porb.png
https://www.asu.cas.cz/~asteroid/19281_2022a_p1.png

It appears good, except for that there is an unfitting deep drop observed by Paolo and Martina on 2022-07-29.0 (around orbit phases 0.32 in the first plot above). Is it a real feature or an observational artifact? More data (errors < 0.02 mag) are needed. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8-15 11.58 0.249
2022- 8-16 9.85 0.249
2022- 8-17 8.12 0.249
2022- 8-18 6.39 0.249
2022- 8-19 4.66 0.249
2022- 8-20 2.93 0.249
2022- 8-21 1.20 0.249
2022- 8-21 23.47 0.249
2022- 8-22 21.74 0.249
2022- 8-23 20.01 0.249
2022- 8-24 18.28 0.249
2022- 8-25 16.55 0.249
2022- 8-26 14.82 0.249
2022- 8-27 13.09 0.249
2022- 8-28 11.36 0.249
2022- 8-29 9.63 0.249
2022- 8-30 7.90 0.249
2022- 8-31 6.17 0.249
2022- 9- 1 4.44 0.249
2022- 9- 2 2.71 0.249
2022- 9- 3 0.98 0.249
2022- 9- 3 23.25 0.249
2022- 9- 4 21.52 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8-15 0.52 0.753
2022- 8-15 22.79 0.753
2022- 8-16 21.06 0.753
2022- 8-17 19.33 0.753
2022- 8-18 17.60 0.753
2022- 8-19 15.87 0.753
2022- 8-20 14.14 0.753
2022- 8-21 12.41 0.753
2022- 8-22 10.68 0.753
2022- 8-23 8.95 0.753
2022- 8-24 7.22 0.753
2022- 8-25 5.49 0.753
2022- 8-26 3.76 0.753
2022- 8-27 2.03 0.753
2022- 8-28 0.30 0.753
2022- 8-28 22.57 0.753
2022- 8-29 20.84 0.753
2022- 8-30 19.11 0.753
2022- 8-31 17.38 0.753
2022- 9- 1 15.65 0.753
2022- 9- 2 13.92 0.753
2022- 9- 3 12.19 0.753
2022- 9- 4 10.46 0.753

Clear Skies, Petr [2022-08-11 08:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this one by Vladimir Benishek, by Paolo Bacci and Martina Maestripieri, by Alessandro Marchini and Riccardo Papini, by Don Pray, and by Petr Fatka, Kamil Hornoch and Peter Kusnirak. LC decomposition:
https://www.asu.cas.cz/~asteroid/19281_2022a_porb.png
https://www.asu.cas.cz/~asteroid/19281_2022a_p1.png

The solution is unique, but more data are needed to improve it (as well as to monitor the evolution of events). Data with errors < 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8- 2 11.87 0.252
2022- 8- 3 10.14 0.252
2022- 8- 4 8.41 0.252
2022- 8- 5 6.68 0.252
2022- 8- 6 4.95 0.252
2022- 8- 7 3.22 0.252
2022- 8- 8 1.49 0.252
2022- 8- 8 23.76 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8- 2 23.01 0.753
2022- 8- 3 21.28 0.753
2022- 8- 4 19.55 0.753
2022- 8- 5 17.82 0.753
2022- 8- 6 16.09 0.753
2022- 8- 7 14.36 0.753
2022- 8- 8 12.63 0.753

Clear Skies, Petr [2022-08-02 09:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to do this one tonight.
Don [2022-07-31 00:38, Sugarloaf] Message sent to observers

· Vladimir Benishek has observed this new target from Sopot, found it to be a binary suspect. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/19281_2022a_p1.png
https://www.asu.cas.cz/~asteroid/19281_2022a_porb.png

More data (errors not greater than 0.02 mag) are needed to confirm it.

Clear Skies, Petr [2022-07-13 13:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one over 4 nights.
Vladimir [2022-07-02 12:55, Sopot AO]

(14469) Komatsuataka (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5190, copied below for your convenience.

Cheers, Petr

(14469) KOMATSUATAKA
V. Benishek, Belgrade Astronomical Observatory; and P. Pravec, Ondrejov
Observatory, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia during Sept. 12-Oct. 18 reveal
that minor planet (14469) is a binary system with an orbital period of 19.32
Â± 0.01 hr. The primary shows a period of 2.6226 Â± 0.0002 hr and has a
lightcurve amplitude of 0.13 magnitude at solar phases 5-12 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events
that are 0.06 to 0.10 magnitude deep indicate a secondary-to-primary mean-
diameter ratio of 0.24 Â± 0.02.

2022 November 12 (CBET 5190) Daniel W. E. Green [2022-11-14 11:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· A likely solution for this one:
https://www.asu.cas.cz/~asteroid/14469_2022a_porb.png
https://www.asu.cas.cz/~asteroid/14469_2022a_p1.png
https://www.asu.cas.cz/~asteroid/14469_2022b_porb.png
https://www.asu.cas.cz/~asteroid/14469_2022b_p1.png

More data (errors not greater than 0.015 mag) are needed to nail it down. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-13 23.12 0.248
2022-10-14 18.43 0.248
2022-10-15 13.75 0.248
2022-10-16 9.06 0.248
2022-10-17 4.38 0.248
2022-10-17 23.69 0.248
2022-10-18 19.01 0.248
2022-10-19 14.32 0.248
2022-10-20 9.64 0.248
2022-10-21 4.95 0.248
2022-10-22 0.27 0.248
2022-10-22 19.58 0.248
2022-10-23 14.90 0.248
2022-10-24 10.21 0.248
2022-10-25 5.53 0.248
2022-10-26 0.84 0.248
2022-10-26 20.16 0.248
2022-10-27 15.47 0.248
2022-10-28 10.79 0.248
2022-10-29 6.10 0.248
2022-10-30 1.42 0.248
2022-10-30 20.73 0.248
2022-10-31 16.05 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-13 13.52 0.752
2022-10-14 8.84 0.752
2022-10-15 4.15 0.752
2022-10-15 23.47 0.752
2022-10-16 18.78 0.752
2022-10-17 14.10 0.752
2022-10-18 9.41 0.752
2022-10-19 4.73 0.752
2022-10-20 0.04 0.752
2022-10-20 19.36 0.752
2022-10-21 14.67 0.752
2022-10-22 9.99 0.752
2022-10-23 5.30 0.752
2022-10-24 0.62 0.752
2022-10-24 19.93 0.752
2022-10-25 15.25 0.752
2022-10-26 10.56 0.752
2022-10-27 5.88 0.752
2022-10-28 1.19 0.752
2022-10-28 20.51 0.752
2022-10-29 15.82 0.752
2022-10-30 11.14 0.752
2022-10-31 6.45 0.752

Clear Skies, Petr [2022-10-13 11:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A likely solution:
https://www.asu.cas.cz/~asteroid/14469_2022a_porb.png
https://www.asu.cas.cz/~asteroid/14469_2022a_p1.png

More data (errors not greater than 0.015 mag) are needed to nail it down. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-23 20.09 0.246
2022- 9-24 15.39 0.246
2022- 9-25 10.69 0.246
2022- 9-26 5.99 0.246
2022- 9-27 1.29 0.246
2022- 9-27 20.59 0.246
2022- 9-28 15.89 0.246
2022- 9-29 11.19 0.246
2022- 9-30 6.49 0.246
2022-10- 1 1.79 0.246
2022-10- 1 21.09 0.246
2022-10- 2 16.39 0.246
2022-10- 3 11.69 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-23 10.49 0.749
2022- 9-24 5.79 0.749
2022- 9-25 1.09 0.749
2022- 9-25 20.39 0.749
2022- 9-26 15.69 0.749
2022- 9-27 10.99 0.749
2022- 9-28 6.29 0.749
2022- 9-29 1.59 0.749
2022- 9-29 20.89 0.749
2022- 9-30 16.19 0.749
2022-10- 1 11.49 0.749
2022-10- 2 6.79 0.749
2022-10- 3 2.09 0.749
2022-10- 3 21.39 0.749

Clear Skies, Petr [2022-09-23 08:31, Ondrejov] Message sent to BinAstPhotSurvey conference

(6896) 1987 RE1 [Add new note]
[Send data to: peter@asu.cas.cz ]
· This new target was observed over four nights.
Vladimir [2022-11-14 02:21, Sopot AO] Message sent to BinAstPhotSurvey conference

(4901) O-Briain (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5189, copied below for your convenience.

Cheers, Petr

(4901) O BRIAIN
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; B. Warner, Center for Solar System Studies, Lander, CA, USA; and
J. Oey, Blue Mountains Observatory, Leura, NSW, Australia, report that
photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.30-m telescope at the Center for Solar System
Studies, and a 0.35-m telescope at the Blue Mountains Observatory during July
14-Sept. 19 reveal that minor planet (4901) is a binary system with an orbital
period of 47.6 Â± 0.1 hr. The primary shows a period of 2.6498 Â± 0.0001 hr
and has a lightcurve amplitude of 0.11 mag at solar phases 5-10 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.08 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.28.

2022 November 7 (CBET 5189) Daniel W. E. Green [2022-11-08 08:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data by Vladimir Benishek from Sopot and by Julian Oey from Leura joined in:
https://www.asu.cas.cz/~asteroid/04901_2022b_porb.png
https://www.asu.cas.cz/~asteroid/04901_2022b_p1.png
https://www.asu.cas.cz/~asteroid/04901_2022c_porb.png
https://www.asu.cas.cz/~asteroid/04901_2022c_p1.png

The solution would still benefit from more good data (errors < 0.02 mag), before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-16 10.94 0.258
2022-10-18 10.57 0.258
2022-10-20 10.20 0.258
2022-10-22 9.83 0.258
2022-10-24 9.46 0.258
2022-10-26 9.09 0.258
2022-10-28 8.72 0.258
2022-10-30 8.35 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2022-10-15 10.82 0.752
2022-10-17 10.45 0.752
2022-10-19 10.08 0.752
2022-10-21 9.71 0.752
2022-10-23 9.34 0.752
2022-10-25 8.97 0.752
2022-10-27 8.60 0.752
2022-10-29 8.23 0.752
2022-10-31 7.86 0.752

Clear Skies, Petr [2022-10-14 12:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target has been found to be binary by Vladimir Benishek, and additional observations were taken by Brian Warner. Current solution:
https://www.asu.cas.cz/~asteroid/04901_2022b_porb.png
https://www.asu.cas.cz/~asteroid/04901_2022b_p1.png

The solution appears unique, but it is still a bit weak, more data (errors < 0.02 mag) would be good to improve it. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-14 16.34 0.254
2022- 9-16 15.94 0.254
2022- 9-18 15.54 0.254
2022- 9-20 15.14 0.254
2022- 9-22 14.74 0.254
2022- 9-24 14.34 0.254
2022- 9-26 13.94 0.254
2022- 9-28 13.54 0.254
2022- 9-30 13.14 0.254
2022-10- 2 12.74 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-13 15.82 0.739
2022- 9-15 15.42 0.739
2022- 9-17 15.02 0.739
2022- 9-19 14.62 0.739
2022- 9-21 14.22 0.739
2022- 9-23 13.82 0.739
2022- 9-25 13.42 0.739
2022- 9-27 13.02 0.739
2022- 9-29 12.62 0.739
2022-10- 1 12.22 0.739
2022-10- 3 11.82 0.739

Clear Skies, Petr [2022-09-06 08:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· I continue to observe this target that I started observing back in July for several nights.
Vladimir [2022-08-16 23:58, Sopot AO]

(1770) Schlesinger (Finished) - Suspect Binary [Add new note]
· Don Pray observed this one from Sugarloaf Mountain on 6 nights in the current apparition, detected no deviation. Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-11-02 09:20, Ondrejov]

· Doing a run on this one tonight in good conditions.
Don [2022-10-15 01:32, Sugarloaf] Message sent to observers

· Starting this one tonight, Sep 25 UT, but clouds may interfere later.
Don [2022-09-25 01:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Probable binary, but still needs more data to be confirmed in the future.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-03-24 13:13, Ondrejov]

· Despite our extensive effort from January 17 to 29, no more events were captured in this one. There appears to be present a weak secondary rotational component (a half (?) period of 13.2 h, amplitude 0.02 mag), but we still need to establish this case to our standards with capturing more events and determining its orbital period. It seems that either we were unlucky with covering orbital phases outside events in the past lunation, or the system moved away from the event geometry recently. I leave it up to you whether you want to observe this one more in the next lunation, just for a case, or if we establish it in a future apparition.
http://www.asu.cas.cz/~asteroid/01770_2020b_p1.png
http://www.asu.cas.cz/~asteroid/01770_2020b_p2.png
http://www.asu.cas.cz/~asteroid/01770_2020a_p1.png
http://www.asu.cas.cz/~asteroid/01770_2020a_porb.png

Petr [2020-02-06 11:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Ran a second night from SRO last night. Data submitted. Both nights were out of event. -Walt [2020-01-29 16:08, Sonoita] Message sent to observers

· Will run from SRO tonight. -Walt [2020-01-28 01:43, Sonoita]

· I am starting a run on this tonight 1/24 3:40 UT. Should run for about 8 hours.

Russ [2020-01-24 03:42, Shed of Science] Message sent to observers

· Marek Husarik and Gabo Cervak have observed this probable binary from Skalnate Pleso recently. A tentative solution (P_orb is not unique of course):
http://www.asu.cas.cz/~asteroid/01770_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01770_2020a_p1.png

More data are needed to establish it. Only good data with errors < 0.02 mag will be useful; don't bother in less ideal conditions.

Clear Skies, Petr [2020-01-10 07:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night from 21:40 UT to 05:15 UT.
Marek [2020-01-08 08:35, SkalnatePleso] [Remove]
Message sent to observers

· Observed on Sunday 05. Duration about 5 hr.
Marek [2020-01-07 11:20, SkalnatePleso] [Remove]

· Despite an extensive effort, we have not obtained a meaningfull period for the apparent attenuations in this one. Following plots for "porb" or "p2" are just to illustrate the behaviour (the longer periods there have no real meaning):
http://www.asu.cas.cz/~asteroid/01770_2016b_p1.png
http://www.asu.cas.cz/~asteroid/01770_2016b_porb.png
http://www.asu.cas.cz/~asteroid/01770_2016a_p1.png
http://www.asu.cas.cz/~asteroid/01770_2016a_porb.png
http://www.asu.cas.cz/~asteroid/01770_2015_p1.png
http://www.asu.cas.cz/~asteroid/01770_2015_p2.png

So, it remains a binary (or maybe a ternary?) suspect, but a confirmation with a good and satisfatory solution for the orbital period has not been obtained. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-04-14 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Session started at 18:30 UT. Michal [2016-03-28 18:46, SkalnatePleso] [Remove]
Message sent to observers

· Session started at 19:55 UT. Michal [2016-03-27 20:03, SkalnatePleso] [Remove]

· Started my telescope at 17:50 UT. Gabo [2016-03-16 17:43, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 18:25 UT. Gabo [2016-03-13 18:29, SkalnatePleso] [Remove]

· I started this at 00:30 UT and should get about 6 hours.
Don [2016-03-12 00:36, Sugarloaf] Message sent to observers

· Started a session at 19:30 UT [2016-03-11 23:37, IAO-Isaac Aznar Obs.]

· Started a session at 19:00 UT [2016-03-11 18:33, OAVdA (B04)] Message sent to BinAstPhotSurvey conference

· Started a session at 19:00 UT [2016-03-10 19:16, OAVdA (B04)]

· This binary suspect was observed by Amadeo Aznar, by Don Pray from Sugarloaf Mountain, and by Marek Husarik and Gabo Cervak from Skalnate Pleso from 2016-02-11 to 03-06. Three events captured. There are a few possible orbital periods, a tentative decomposition for one of them:
http://www.asu.cas.cz/~asteroid/01770_2016b_porb.png
http://www.asu.cas.cz/~asteroid/01770_2016b_p1.png
http://www.asu.cas.cz/~asteroid/01770_2016a_porb.png
http://www.asu.cas.cz/~asteroid/01770_2016a_p1.png

More data (long sessions with errors < 0.03 mag) are critically needed to resolve the orbital period. Below are tentative ephemerides for the possible periods (but don't confine your observations too narrowly about the possible event times).

Date/Time UTC (LTc.)
--------------------
2016- 3-10 3.49
2016- 3-12 12.94
2016- 3-14 22.39

Date/Time UTC (LTc.)
--------------------
2016- 3-11 8.24
2016- 3-13 17.69

Date/Time UTC (LTc.)
--------------------
2016- 3- 9 8.19
2016- 3-10 22.49
2016- 3-12 12.79
2016- 3-14 3.09

Date/Time UTC (LTc.)
--------------------
2016- 3-10 3.35
2016- 3-11 17.65
2016- 3-13 7.95
2016- 3-14 22.25

Clear Skies, Petr [2016-03-09 06:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one at 00:40 UT.
Don [2016-03-01 00:44, Sugarloaf] Message sent to observers

· New data were taken for this suspect by Don Pray from Sugarloaf Mountain, by Gabriel Cervak and Marek Husarik from Skalnate Pleso, and by Amadeo Aznar from Isaac Aznar Observatory. There is indeed present a second period (though its solution isn't unique yet):
http://www.asu.cas.cz/~asteroid/01770_2016a_p1.png
http://www.asu.cas.cz/~asteroid/01770_2016a_p2.png
http://www.asu.cas.cz/~asteroid/01770_2015_p1.png
http://www.asu.cas.cz/~asteroid/01770_2015_p2.png

No obvious events seen, but the data taken so far are still not very abundant for that ....

Clear Skies, Petr [2016-02-17 07:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 23:45, Feb 14 UT.
Don [2016-02-15 01:12, Sugarloaf] Message sent to observers

· Started a run at 22:00 UT. Gabo [2016-02-11 22:05, SkalnatePleso] [Remove]

· Marek Husarik and coll. took two nights for this new target from Skalnate Pleso in December. There appears to be a second lightcurve component present; a decomposition:
http://www.asu.cas.cz/~asteroid/01770_p1.png
http://www.asu.cas.cz/~asteroid/01770_p2.png
(The P_2 solution is not unique, the value above is one of a few possible solutions.)

I encourage to take more data to confirm presence of the second lightcurve component and to capture events if they occur.

Clear Skies, Petr [2016-02-08 10:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting at 18:50 UT. Gabo [2016-01-21 19:02, SkalnatePleso] [Remove]
Message sent to observers

· Start observing at 19:00 UT. Gabo [2016-01-19 20:15, SkalnatePleso] [Remove]

· Observing this target at 19:15 UT. Gabo [2016-01-18 21:41, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(1798) Watts (Finished) - binary [Add new note]
· Don Pray observed this return binary extensively in this 2nd apparition, found it to be away from events geometry. Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-10-31 11:38, Ondrejov]

· Observing this one tonight.
Don [2022-10-15 01:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this one Sep 24 UT.
Don [2022-09-24 01:10, Sugarloaf]

· Done for the discovery apparition. [2017-04-11 07:28, Ondrejov]

· Our announcement on this one has appeared on CBET 4374, copied below for your convenience.

Cheers, Petr

(1798) WATTS
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, H. Kucakova, J. Vrastil, K. Hornoch, and P. Kusnirak, Ondrejov
Observatory; W. Cooney and J. Gross, Sonoita Research Observatory, Sonoita,
AZ, U.S.A.; D. Terrell, Southwest Research Institute; B. Flanagan and B.
Pellerin, Madrona Peak Observatory, Medina, TX, U.S.A.; and J. Oey, Blue
Mountains Observatory, Leura, NSW, Australia, report that photometric
observations taken with a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.65-m telescope at the Ondrejov Observatory, a 0.50-m
telescope at the Sonoita Research Observatory, a 0.6-m telescope at the
Madrona Peak Observatory, and a 0.35-m telescope at the Blue Mountains
Observatory during 2017 Jan. 31-Mar. 15 reveal that minor planet (1798) is
a binary system with an orbital period of 26.96 Â± 0.01 hr. The primary
shows a period of 3.5060 Â± 0.0004 hr and has a lightcurve amplitude of
0.06 mag at solar phase 5 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.06- to 0.11-magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.25 Â± 0.02.
The mean absolute R magnitude in the Cousins system is H_R = 12.81 Â± 0.08,
assuming the phase relation slope parameter G = 0.24 Â± 0.11.

2017 March 19 (CBET 4374) Daniel W. E. Green [2017-03-19 14:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready to be published on CBET.
http://www.asu.cas.cz/~asteroid/01798_2017c_porb.png
http://www.asu.cas.cz/~asteroid/01798_2017c_p1.png
http://www.asu.cas.cz/~asteroid/01798_2017b_porb.png
http://www.asu.cas.cz/~asteroid/01798_2017b_p1.png
http://www.asu.cas.cz/~asteroid/01798_2017a_porb.png
http://www.asu.cas.cz/~asteroid/01798_2017a_p1.png

More data for both events with errors < 0.02 mag (don't bother in less ideal conditions) would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-16 11.24 0.251
2017- 3-17 14.20 0.251
2017- 3-18 17.16 0.251
2017- 3-19 20.12 0.251
2017- 3-20 23.08 0.251
2017- 3-22 2.04 0.251
2017- 3-23 5.00 0.251
2017- 3-24 7.96 0.251
2017- 3-25 10.92 0.251
2017- 3-26 13.88 0.251
2017- 3-27 16.84 0.251
2017- 3-28 19.80 0.251
2017- 3-29 22.76 0.251
2017- 3-31 1.72 0.251
2017- 4- 1 4.68 0.251
2017- 4- 2 7.64 0.251
2017- 4- 3 10.60 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-17 0.68 0.750
2017- 3-18 3.64 0.750
2017- 3-19 6.60 0.750
2017- 3-20 9.56 0.750
2017- 3-21 12.52 0.750
2017- 3-22 15.48 0.750
2017- 3-23 18.44 0.750
2017- 3-24 21.40 0.750
2017- 3-26 0.36 0.750
2017- 3-27 3.32 0.750
2017- 3-28 6.28 0.750
2017- 3-29 9.24 0.750
2017- 3-30 12.20 0.750
2017- 3-31 15.16 0.750
2017- 4- 1 18.12 0.750
2017- 4- 2 21.08 0.750

Clear Skies, Petr [2017-03-16 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working from Madrona Peak again tonight. -Walt [2017-03-15 01:12, Sonoita] Message sent to observers

· Will run from Madrona Peak tonight. -Walt [2017-03-14 01:05, Sonoita]

· This one is almost ready to be published on CBET.
http://www.asu.cas.cz/~asteroid/01798_2017b_porb.png
http://www.asu.cas.cz/~asteroid/01798_2017b_p1.png
http://www.asu.cas.cz/~asteroid/01798_2017a_porb.png
http://www.asu.cas.cz/~asteroid/01798_2017a_p1.png

It would be good to take one more good run (errors < 0.02 mag) for the 0.25-phase event before we do a CBET announcement. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-16 11.40 0.257
2017- 3-17 14.36 0.257
2017- 3-18 17.32 0.257
2017- 3-19 20.28 0.257
2017- 3-20 23.24 0.257
2017- 3-22 2.20 0.257
2017- 3-23 5.16 0.257
2017- 3-24 8.12 0.257
2017- 3-25 11.08 0.257
2017- 3-26 14.04 0.257
2017- 3-27 17.00 0.257
2017- 3-28 19.96 0.257
2017- 3-29 22.92 0.257
2017- 3-31 1.88 0.257
2017- 4- 1 4.84 0.257
2017- 4- 2 7.80 0.257
2017- 4- 3 10.76 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-15 21.69 0.749
2017- 3-17 0.65 0.749
2017- 3-18 3.61 0.749
2017- 3-19 6.57 0.749
2017- 3-20 9.53 0.749
2017- 3-21 12.49 0.749
2017- 3-22 15.45 0.749
2017- 3-23 18.41 0.749
2017- 3-24 21.37 0.749
2017- 3-26 0.33 0.749
2017- 3-27 3.29 0.749
2017- 3-28 6.25 0.749
2017- 3-29 9.21 0.749
2017- 3-30 12.17 0.749
2017- 3-31 15.13 0.749
2017- 4- 1 18.09 0.749
2017- 4- 2 21.05 0.749

Clear Skies, Petr [2017-03-07 13:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:30 UT, and will hopefully catch the 0.25 phase event.
Don [2017-03-05 01:38, Sugarloaf] Message sent to observers

· Started this at 00:50 UT.
Don [2017-02-27 01:08, Sugarloaf]

· Will run from SRO again tonight. The .25 event should be in the middle of our run. -Walt [2017-02-24 01:40, Sonoita] Message sent to observers

· Will run from SRO tonight. -Walt [2017-02-21 00:56, Sonoita]

· This one has turned out to be binary:
http://www.asu.cas.cz/~asteroid/01798_2017b_porb.png
http://www.asu.cas.cz/~asteroid/01798_2017b_p1.png
http://www.asu.cas.cz/~asteroid/01798_2017a_porb.png
http://www.asu.cas.cz/~asteroid/01798_2017a_p1.png
The solution appears unique. Before publishing it on CBET, we need to take one more good coverage for each of the two events. Errors < 0.02 mag are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2-20 21.05 0.250
2017- 2-22 0.01 0.250
2017- 2-23 2.97 0.250
2017- 2-24 5.93 0.250
2017- 2-25 8.89 0.250
2017- 2-26 11.85 0.250
2017- 2-27 14.81 0.250
2017- 2-28 17.77 0.250
2017- 3- 1 20.73 0.250
2017- 3- 2 23.69 0.250
2017- 3- 4 2.65 0.250
2017- 3- 5 5.61 0.250
2017- 3- 6 8.57 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2-21 10.52 0.750
2017- 2-22 13.48 0.750
2017- 2-23 16.44 0.750
2017- 2-24 19.40 0.750
2017- 2-25 22.36 0.750
2017- 2-27 1.32 0.750
2017- 2-28 4.28 0.750
2017- 3- 1 7.24 0.750
2017- 3- 2 10.20 0.750
2017- 3- 3 13.16 0.750
2017- 3- 4 16.12 0.750
2017- 3- 5 19.08 0.750
2017- 3- 6 22.04 0.750

Clear Skies, Petr [2017-02-20 05:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 00:05 UT.
Don [2017-02-20 00:07, Sugarloaf]

· I did a run on this on Feb 18 and started a run tonight at 00:45 UT.
Don [2017-02-19 02:12, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray have observed this new target from Sugarloaf Mountain on three nights. His data don't fit with a single period, but I get a two-period solution (and a possible attenuation on one night). The two rotational lightcurves (the periods are not unique yet):
http://www.asu.cas.cz/~asteroid/01798_p1.png
http://www.asu.cas.cz/~asteroid/01798_p2.png

More data are needed to establish it. High quality (errors < 0.02 mag) and long sessions are needed; don't bother in sub-optimal conditions.

Clear Skies, Petr [2017-02-06 08:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did runs on this on Jan 31 and Feb 2. It looks like a slow rotator.
Don [2017-02-02 21:43, Sugarloaf]

(5319) Petrovskaya (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5180, copied below for your convenience.

Cheers, Petr

(5319) PETROVSKAYA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during July 2-Aug. 27 reveal that minor planet (5319) is a
binary system with an orbital period of 28.48 Â± 0.01 hr. The primary shows
a period of 3.3604 Â± 0.0002 hr and has a lightcurve amplitude of 0.19
magnitude at solar phases 7-11 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.07 to 0.14 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.26.

2022 October 18 (CBET 5180) Daniel W. E. Green [2022-10-18 06:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this one by Vladimir Benishek from Sopot. Current solution:
https://www.asu.cas.cz/~asteroid/05319_2022a_porb.png
https://www.asu.cas.cz/~asteroid/05319_2022a_p1.png
https://www.asu.cas.cz/~asteroid/05319_2022b_porb.png
https://www.asu.cas.cz/~asteroid/05319_2022b_p1.png
https://www.asu.cas.cz/~asteroid/05319_2022c_porb.png
https://www.asu.cas.cz/~asteroid/05319_2022c_p1.png

The events are evolving, so it would be good to take more data (errors < 0.02 mag) before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-14 15.35 0.236
2022- 9-15 19.83 0.236
2022- 9-17 0.31 0.236
2022- 9-18 4.79 0.236
2022- 9-19 9.27 0.236
2022- 9-20 13.75 0.236
2022- 9-21 18.23 0.236
2022- 9-22 22.71 0.236
2022- 9-24 3.19 0.236
2022- 9-25 7.67 0.236
2022- 9-26 12.15 0.236
2022- 9-27 16.63 0.236
2022- 9-28 21.11 0.236
2022- 9-30 1.59 0.236
2022-10- 1 6.07 0.236
2022-10- 2 10.55 0.236

Date/Time UTC (LTc.) Phase
--------------------------
2022- 9-14 1.21 0.739
2022- 9-15 5.69 0.739
2022- 9-16 10.17 0.739
2022- 9-17 14.65 0.739
2022- 9-18 19.13 0.739
2022- 9-19 23.61 0.739
2022- 9-21 4.09 0.739
2022- 9-22 8.57 0.739
2022- 9-23 13.05 0.739
2022- 9-24 17.53 0.739
2022- 9-25 22.01 0.739
2022- 9-27 2.49 0.739
2022- 9-28 6.97 0.739
2022- 9-29 11.45 0.739
2022- 9-30 15.93 0.739
2022-10- 1 20.41 0.739

Clear Skies, Petr [2022-09-06 11:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this one by Vladimir Benishek from Sopot and by Russ Durkee from Shed of Science South. Current solution:
https://www.asu.cas.cz/~asteroid/05319_2022a_porb.png
https://www.asu.cas.cz/~asteroid/05319_2022a_p1.png
https://www.asu.cas.cz/~asteroid/05319_2022b_porb.png
https://www.asu.cas.cz/~asteroid/05319_2022b_p1.png
https://www.asu.cas.cz/~asteroid/05319_2022c_porb.png
https://www.asu.cas.cz/~asteroid/05319_2022c_p1.png

The orbit period appears unique, but the events are "unstable" and evolving. More observations are needed. Data with errors not greater than 0.015 mag will be useful; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8-15 23.43 0.239
2022- 8-17 3.91 0.239
2022- 8-18 8.39 0.239
2022- 8-19 12.87 0.239
2022- 8-20 17.35 0.239
2022- 8-21 21.83 0.239
2022- 8-23 2.31 0.239
2022- 8-24 6.79 0.239
2022- 8-25 11.27 0.239
2022- 8-26 15.75 0.239
2022- 8-27 20.23 0.239
2022- 8-29 0.71 0.239
2022- 8-30 5.19 0.239
2022- 8-31 9.67 0.239
2022- 9- 1 14.15 0.239
2022- 9- 2 18.63 0.239
2022- 9- 3 23.11 0.239
2022- 9- 5 3.59 0.239

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8-15 9.29 0.742
2022- 8-16 13.77 0.742
2022- 8-17 18.25 0.742
2022- 8-18 22.73 0.742
2022- 8-20 3.21 0.742
2022- 8-21 7.69 0.742
2022- 8-22 12.17 0.742
2022- 8-23 16.65 0.742
2022- 8-24 21.13 0.742
2022- 8-26 1.61 0.742
2022- 8-27 6.09 0.742
2022- 8-28 10.57 0.742
2022- 8-29 15.05 0.742
2022- 8-30 19.53 0.742
2022- 9- 1 0.01 0.742
2022- 9- 2 4.49 0.742
2022- 9- 3 8.97 0.742
2022- 9- 4 13.45 0.742
2022- 9- 5 17.93 0.742

Clear Skies, Petr [2022-08-11 07:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot, found it to be a serious binary candidate. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/05319_2022a_p1.png
https://www.asu.cas.cz/~asteroid/05319_2022a_porb.png
(The period in the second plot above was set just for plotting purpose, there is no real solution for the orbit period yet.)

More data (errors not greater than 0.02 mag) are needed to establish it.

Clear Skies, Petr [2022-07-13 07:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed on 3 nights.
Vladimir [2022-07-03 16:20, Sopot AO]

(13123) Tyson (Finished) - probable binary [Add new note]
· Done in the 3rd apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:46, Ondrejov]

· Observing this tonight.
Don [2022-02-01 00:04, Sugarloaf] Message sent to observers

· Doing this one tonight.
Don [2022-01-31 01:12, Sugarloaf]

· I did this one on Jan 26 and am planning on it again tonight, Jan 27 UT.
Don [2022-01-26 21:49, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.
Don [2022-01-12 00:59, Sugarloaf]

· Doing this one tonight if wind allows.
Don [2022-01-08 01:07, Sugarloaf] Message sent to observers

· I'm doing a run on this one tonight, Jan. 4 UT.
Don [2022-01-04 02:10, Sugarloaf]

· I've observed this on 2 nights, Dec 14 and 27.
Don [2021-12-31 02:21, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done enough for the 2nd apparition. Petr [2018-01-03 09:07, Ondrejov]

· Started this at 00:15 UT.
Don [2017-12-20 00:20, Sugarloaf]

· Started this return probable binary on Dec 15 UT.
Don [2017-12-16 21:16, Sugarloaf] Message sent to BinAstPhotSurvey conference

· With the last night of 02-24 by Don Pray, we are closing this target for now. It's a serious binary suspect ---P_2 appears significant--- but no events detected so far.
http://www.asu.cas.cz/~asteroid/13123_p1.png
http://www.asu.cas.cz/~asteroid/13123_p2.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-02-25 08:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 23:45, Feb 23 UT.
Don [2015-02-24 03:05, Sugarloaf] Message sent to observers

· Starting this at 00:00 UT.
Don [2015-02-20 23:38, Sugarloaf]

· Additional observations taken by Kamil Hornoch and Jan Vrastil from here, Don Pray from Sugarloaf Mountain, and Vladimir Benishek from Sopot were joined in. There is a weak, but apparently significant signal with a second period of 3.86 h, amplitude 0.04 mag (U = 2).
http://www.asu.cas.cz/~asteroid/13123_p1.png
http://www.asu.cas.cz/~asteroid/13123_p2.png
(Periods twice or thrice P_1 don't explain the data.) No mutual event seen so far.

More data (long sessions with errors < 0.03 mag) could be still useful, but given the good coverage we have already got with the several sessions 8-9 hours long, it seems that we are away from events geometry, or the orbital period is long. So, an extensive further effort may not be justified; consider turning to other targets.

Clear Skies, Petr [2015-02-20 12:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night (Feb. 19-20, 19:41 - 04:12 UT).
Vladimir [2015-02-20 11:17, Sopot AO] Message sent to observers

· I started a run at 01:00 UT in unexpected clear sky. Hopefully, it will remain clear for several hours.
Don [2015-02-18 03:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

· The observations by Vladimir Benishek from Sopot of 2015-02-13.0 confirm a presence of the second lightcurve component, though its period is still far from unique; one of several possible values see below. P_1 has been refined to 3.33 h.
http://www.asu.cas.cz/~asteroid/13123_p1.png
http://www.asu.cas.cz/~asteroid/13123_p2.png

More data (long sessions with errors < 0.03 mag) are needed.

Clear Skies, Petr [2015-02-14 08:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this target last night (Feb. 12-13, 19:42 - 04:09 UT).
Vladimir [2015-02-13 14:19, Sopot AO] Message sent to observers

· Don Pray has started this new target from Sugarloaf Mountain, took 9 hours worth of data. He has found there deviations from the main period of 3.40 hours. It appears to be a second lightcurve component, though its period is uncertain yet; one possible solution:
http://www.asu.cas.cz/~asteroid/13123_p1.png
http://www.asu.cas.cz/~asteroid/13123_p2.png

I encourage others here to help out Don to nail it down, and to capture events if they occur. Long sessions with errors < 0.03 mag are needed.

Clear Skies, Petr [2015-02-12 08:12, Ondrejov] Message sent to BinAstPhotSurvey conference

(4607) Seilandfarm (Finished) - binary [Add new note]
· Done in the 6th apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:37, Ondrejov]

· Doing a run on this tonight, attempting to get the LC out of event.
Don [2022-01-08 01:09, Sugarloaf] Message sent to observers

· Event ephemeris for the rest of the current lunation:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 1- 6 11.67 0.245
2022- 1- 7 19.32 0.245
2022- 1- 9 2.97 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2022- 1- 5 19.83 0.745
2022- 1- 7 3.48 0.745
2022- 1- 8 11.13 0.745

Clear Skies, Petr [2022-01-05 14:41, Ondrejov]

· Starting a run on this one tonight.

Russ [2021-12-23 01:55, Shed of Science] Message sent to observers

· Started a run on this one.

Russ [2021-12-07 03:54, Shed of Science]

· Doing a run on this tonight to, hopefully, catch the 0.237 phase event.
Don [2021-11-25 00:57, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray has observed this return binary on 4 nights:
http://www.asu.cas.cz/~asteroid/04607_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04607_2021a_p1.png

More high-quality data (errors < 0.015 mag) for both events would be useful for future modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-11-10 18.44 0.237
2021-11-12 2.09 0.237
2021-11-13 9.74 0.237
2021-11-14 17.39 0.237
2021-11-23 22.94 0.237
2021-11-25 6.59 0.237
2021-11-26 14.24 0.237
2021-11-27 21.89 0.237
2021-11-29 5.54 0.237
2021-11-30 13.19 0.237
2021-12- 1 20.84 0.237
2021-12- 3 4.49 0.237
2021-12- 4 12.14 0.237
2021-12- 5 19.79 0.237
2021-12- 7 3.44 0.237
2021-12- 8 11.09 0.237
2021-12- 9 18.74 0.237
2021-12-11 2.39 0.237
2021-12-12 10.04 0.237

Date/Time UTC (LTc.) Phase
--------------------------
2021-11-10 2.66 0.738
2021-11-11 10.31 0.738
2021-11-12 17.96 0.738
2021-11-14 1.61 0.738
2021-11-15 9.26 0.738
2021-11-23 7.16 0.738
2021-11-24 14.81 0.738
2021-11-25 22.46 0.738
2021-11-27 6.11 0.738
2021-11-28 13.76 0.738
2021-11-29 21.41 0.738
2021-12- 1 5.06 0.738
2021-12- 2 12.71 0.738
2021-12- 3 20.36 0.738
2021-12- 5 4.01 0.738
2021-12- 6 11.66 0.738
2021-12- 7 19.31 0.738
2021-12- 9 2.96 0.738
2021-12-10 10.61 0.738
2021-12-11 18.26 0.738

Clear Skies, Petr [2021-11-09 11:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a run on this on Nov 4 and 5.
Don [2021-11-08 03:18, Sugarloaf]

· Object done for the 5th apparition. Petr [2019-03-19 13:51, Ondrejov]

· Data taken by Don Pray from Sugarloaf Mountain in this apparition so far:
http://www.asu.cas.cz/~asteroid/04607_2019a_porb.png
http://www.asu.cas.cz/~asteroid/04607_2019a_p1.png

More data (errors < 0.02 mag) would be useful for refined modeling. Only good data are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 2-26 17.28 0.251
2019- 2-28 0.93 0.251
2019- 3- 1 8.58 0.251
2019- 3- 2 16.23 0.251
2019- 3- 3 23.88 0.251
2019- 3- 5 7.53 0.251
2019- 3- 6 15.18 0.251
2019- 3- 7 22.83 0.251
2019- 3- 9 6.48 0.251
2019- 3-10 14.13 0.251
2019- 3-11 21.78 0.251
2019- 3-13 5.43 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2019- 2-27 9.12 0.752
2019- 2-28 16.77 0.752
2019- 3- 2 0.42 0.752
2019- 3- 3 8.07 0.752
2019- 3- 4 15.72 0.752
2019- 3- 5 23.37 0.752
2019- 3- 7 7.02 0.752
2019- 3- 8 14.67 0.752
2019- 3- 9 22.32 0.752
2019- 3-11 5.97 0.752
2019- 3-12 13.62 0.752
2019- 3-13 21.27 0.752

Clear Skies, Petr [2019-02-26 08:33, Ondrejov]

· Doing a run tonight to catch the 0.753 phase event.
Don [2019-02-10 00:07, Sugarloaf] Message sent to observers

· Planning to start this at 00:55, Jan 26 UT.
Don [2019-01-25 23:57, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray took first data for this return binary in its current apparition. Lc decomposition:
http://www.asu.cas.cz/~asteroid/04607_2019a_porb.png
http://www.asu.cas.cz/~asteroid/04607_2019a_p1.png

More data (errors < 0.02 mag) would be useful for refined modeling. Only good data are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 1-15 12.60 0.255
2019- 1-16 20.25 0.255
2019- 1-24 18.15 0.255
2019- 1-26 1.80 0.255
2019- 1-27 9.45 0.255
2019- 1-28 17.10 0.255
2019- 1-30 0.75 0.255
2019- 1-31 8.40 0.255
2019- 2- 1 16.05 0.255
2019- 2- 2 23.70 0.255
2019- 2- 4 7.35 0.255
2019- 2- 5 15.00 0.255
2019- 2- 6 22.65 0.255
2019- 2- 8 6.30 0.255
2019- 2- 9 13.95 0.255
2019- 2-10 21.60 0.255
2019- 2-12 5.25 0.255
2019- 2-13 12.90 0.255
2019- 2-14 20.55 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2019- 1-16 4.35 0.753
2019- 1-17 12.00 0.753
2019- 1-24 2.25 0.753
2019- 1-25 9.90 0.753
2019- 1-26 17.55 0.753
2019- 1-28 1.20 0.753
2019- 1-29 8.85 0.753
2019- 1-30 16.50 0.753
2019- 2- 1 0.15 0.753
2019- 2- 2 7.80 0.753
2019- 2- 3 15.45 0.753
2019- 2- 4 23.10 0.753
2019- 2- 6 6.75 0.753
2019- 2- 7 14.40 0.753
2019- 2- 8 22.05 0.753
2019- 2-10 5.70 0.753
2019- 2-11 13.35 0.753
2019- 2-12 21.00 0.753
2019- 2-14 4.65 0.753

Petr [2019-01-15 08:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this at 02:00 UT in uncertain conditions.
Don [2019-01-15 01:09, Sugarloaf]

· Started this return binary on Jan 12.
Don [2019-01-13 18:57, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for the 4th apparition. [2017-10-03 05:20, Ondrejov]

· This return binary has been worked by Don Pray from Sugarloaf Mountain and by Hana Kucakova, Petr Fatka and Peter Kusnirak from here recently:
http://www.asu.cas.cz/~asteroid/04607_2017a_porb.png
http://www.asu.cas.cz/~asteroid/04607_2017a_p1.png

More data (but only in good conditions, with errors <= 0.02 mag) would be useful for refined modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 8-31 14.37 0.255
2017- 9- 1 22.02 0.255
2017- 9- 9 19.92 0.255
2017- 9-11 3.57 0.255
2017- 9-12 11.22 0.255
2017- 9-13 18.87 0.255
2017- 9-15 2.52 0.255
2017- 9-16 10.17 0.255
2017- 9-17 17.82 0.255
2017- 9-19 1.47 0.255
2017- 9-20 9.12 0.255
2017- 9-21 16.77 0.255
2017- 9-23 0.42 0.255
2017- 9-24 8.07 0.255
2017- 9-25 15.72 0.255
2017- 9-26 23.37 0.255
2017- 9-28 7.02 0.255
2017- 9-29 14.67 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2017- 9- 1 6.12 0.753
2017- 9-10 11.67 0.753
2017- 9-11 19.32 0.753
2017- 9-13 2.97 0.753
2017- 9-14 10.62 0.753
2017- 9-15 18.27 0.753
2017- 9-17 1.92 0.753
2017- 9-18 9.57 0.753
2017- 9-19 17.22 0.753
2017- 9-21 0.87 0.753
2017- 9-22 8.52 0.753
2017- 9-23 16.17 0.753
2017- 9-24 23.82 0.753
2017- 9-26 7.47 0.753
2017- 9-27 15.12 0.753
2017- 9-28 22.77 0.753

Clear Skies, Petr [2017-08-31 10:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start a run on this at 02:30 UT.
Don [2017-08-26 01:03, Sugarloaf] Message sent to observers

· Starting this one at 05:00 UT.
Don [2017-08-14 01:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This binary has been done in the 3rd apparition. We are going to start modeling.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-12-01 10:44, Ondrejov]

· Started this at 22:15 UT and hope to catch the 0.250 phase event.
Don [2014-11-28 22:22, Sugarloaf] Message sent to observers

· Started at 0040 UT from Prompt Tololo. Hope to cover the secondary event at 0336 UT. [2014-11-23 01:00, Dark Sky & PROMPT]

· I started a run at 02:10 UT and hope to catch the 0.250 phase event.
Don [2014-11-21 02:20, Sugarloaf] Message sent to observers

· Started at 0030 UT from Prompt Tololo. Hope to get about 7 hours and cover the secondary event at 0440 UT. Joe [2014-11-19 03:24, Dark Sky & PROMPT]

· Further monitoring (covering each event twice per lunation) would be useful for future modeling of this binary; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-10 15.07 0.250
2014-11-11 22.72 0.250
2014-11-13 6.37 0.250
2014-11-14 14.02 0.250
2014-11-15 21.67 0.250
2014-11-17 5.32 0.250
2014-11-18 12.97 0.250
2014-11-19 20.62 0.250
2014-11-21 4.27 0.250
2014-11-22 11.92 0.250
2014-11-23 19.57 0.250
2014-11-25 3.22 0.250
2014-11-26 10.87 0.250
2014-11-27 18.52 0.250
2014-11-29 2.17 0.250
2014-11-30 9.82 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-11 6.75 0.746
2014-11-12 14.40 0.746
2014-11-13 22.05 0.746
2014-11-15 5.70 0.746
2014-11-16 13.35 0.746
2014-11-17 21.00 0.746
2014-11-19 4.65 0.746
2014-11-20 12.30 0.746
2014-11-21 19.95 0.746
2014-11-23 3.60 0.746
2014-11-24 11.25 0.746
2014-11-25 18.90 0.746
2014-11-27 2.55 0.746
2014-11-28 10.20 0.746
2014-11-29 17.85 0.746

Clear Skies, Petr [2014-11-06 09:26, Ondrejov]

· Started at 0015 UT from Prompt Tololo. Hope to get about 8 hours and cover the primary event at 0254 UT. Joe [2014-10-27 03:25, Dark Sky & PROMPT] Message sent to observers

· New observations by Don Pray from Sugarloaf Mountain and by Kamil Hornoch from here have covered the secondary event well enough for this lunation.
http://www.asu.cas.cz/~asteroid/04607_2014b_porb.png
http://www.asu.cas.cz/~asteroid/04607_2014b_p1.png
http://www.asu.cas.cz/~asteroid/04607_2014a_porb.png
http://www.asu.cas.cz/~asteroid/04607_2014a_p1.png

Covering the primary event would be useful; use its ephemeris posted here on October 6.

Clear Skies,

Petr [2014-10-26 11:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 10/22 and captured 0.75 phase [2014-10-24 00:25, Blue Mountains Obs] Message sent to observers

· I plan to start this at 01:10 UT.
Don [2014-10-17 23:59, Sugarloaf]

· Observed on 10/16 and captured phase 0.25. [2014-10-17 23:59, Blue Mountains Obs]

· I did a run on this one on Oct 13, and captured the 0.750 phase event.
Don [2014-10-15 01:38, Sugarloaf] Message sent to observers

· Good data obtained for this one from Sugarloaf Mountain and from here in the past lunation:
http://www.asu.cas.cz/~asteroid/04607_2014_porb.png
http://www.asu.cas.cz/~asteroid/04607_2014_p1.png

More data (errors <= 0.02 mag) would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-12 14.77 0.250
2014-10-13 22.42 0.250
2014-10-15 6.07 0.250
2014-10-16 13.72 0.250
2014-10-17 21.37 0.250
2014-10-19 5.02 0.250
2014-10-20 12.67 0.250
2014-10-21 20.32 0.250
2014-10-23 3.97 0.250
2014-10-24 11.62 0.250
2014-10-25 19.27 0.250
2014-10-27 2.92 0.250
2014-10-28 10.57 0.250
2014-10-29 18.22 0.250
2014-10-31 1.87 0.250
2014-11- 1 9.52 0.250
2014-11- 2 17.17 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-13 6.58 0.750
2014-10-14 14.23 0.750
2014-10-15 21.88 0.750
2014-10-17 5.53 0.750
2014-10-18 13.18 0.750
2014-10-19 20.83 0.750
2014-10-21 4.48 0.750
2014-10-22 12.13 0.750
2014-10-23 19.78 0.750
2014-10-25 3.43 0.750
2014-10-26 11.08 0.750
2014-10-27 18.73 0.750
2014-10-29 2.38 0.750
2014-10-30 10.03 0.750
2014-10-31 17.68 0.750
2014-11- 2 1.33 0.750
2014-11- 3 8.98 0.750

Clear Skies, Petr [2014-10-06 13:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:25 UT under some high clouds. Peter K. [2014-09-29 20:41, Ondrejov] Message sent to observers

· I'll be starting this one at 03:00 UT to catch most of the 0.251 phase event.
Don [2014-09-24 01:18, Sugarloaf]

· This return binary has been observed by Don Pray from Sugarloaf Mountain and by Peter Kusnirak, Jan Vrastil and Kamil Hornoch from here in its current 3rd apparition:
http://www.asu.cas.cz/~asteroid/04607_2014_porb.png
http://www.asu.cas.cz/~asteroid/04607_2014_p1.png

Covering the primary event once more and the secondary event twice should be sufficient for this lunation; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 9-22 20.05 0.251
2014- 9-24 3.70 0.251
2014- 9-25 11.35 0.251
2014- 9-26 19.00 0.251
2014- 9-28 2.65 0.251
2014- 9-29 10.30 0.251
2014- 9-30 17.95 0.251
2014-10- 2 1.60 0.251
2014-10- 3 9.25 0.251
2014-10- 4 16.90 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2014- 9-23 11.86 0.751
2014- 9-24 19.51 0.751
2014- 9-26 3.16 0.751
2014- 9-27 10.81 0.751
2014- 9-28 18.46 0.751
2014- 9-30 2.11 0.751
2014-10- 1 9.76 0.751
2014-10- 2 17.41 0.751
2014-10- 4 1.06 0.751
2014-10- 5 8.71 0.751

Clear Skies, Petr [2014-09-22 11:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm planning to start on this at 03:10 UT.
Don [2014-09-20 00:25, Sugarloaf] Message sent to observers

· Planning a run to start at 03:15 UT.
Don [2014-09-19 00:36, Sugarloaf]

· Observing from 20:50 UT. Peter [2014-09-18 21:08, Ondrejov]

· I plan to start this at 03:20 UT.
Don [2014-09-18 00:24, Sugarloaf] Message sent to observers

· Plan to start this at 03:30 UT.
Don [2014-09-17 01:11, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Second apparition is over, data from a third apparition will be needed for modeling.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys!

Cheers, Petr [2012-03-05 13:09, Ondrejov]

· Observed for short time last night (less than three hours). Clouds came before the event starts. Peter K. [2012-02-20 08:52, Ondrejov] Message sent to observers

· Started a run at 00:00 UT and hope to catch much of 0.259 event and some of the non-event LC.
Don [2012-02-16 00:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 23:45, Feb 13 UT. Will capture the 0.758 phase event.
Don [2012-02-14 01:06, Sugarloaf]

· Started this one at 23:25 UT.
Don [2012-02-09 23:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Last few sessions (both covering events and outside events) with errors < 0.03 mag needed to complete the dataset for this apparition; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-10 18.05 0.259
2012- 2-12 1.70 0.259
2012- 2-13 9.35 0.259
2012- 2-14 17.00 0.259
2012- 2-16 0.65 0.259
2012- 2-17 8.30 0.259
2012- 2-18 15.95 0.259
2012- 2-19 23.60 0.259
2012- 2-21 7.25 0.259
2012- 2-22 14.90 0.259
2012- 2-23 22.55 0.259
2012- 2-25 6.20 0.259
2012- 2-26 13.85 0.259
2012- 2-27 21.50 0.259

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-11 9.83 0.758
2012- 2-12 17.48 0.758
2012- 2-14 1.13 0.758
2012- 2-15 8.78 0.758
2012- 2-16 16.43 0.758
2012- 2-18 0.08 0.758
2012- 2-19 7.73 0.758
2012- 2-20 15.38 0.758
2012- 2-21 23.03 0.758
2012- 2-23 6.68 0.758
2012- 2-24 14.33 0.758
2012- 2-25 21.98 0.758
2012- 2-27 5.63 0.758
2012- 2-28 13.28 0.758

Clear Skies, Petr [2012-02-08 13:48, Ondrejov]

· After recommendation by Peter I plan this tonight. If weather permits I plan 5407 in the second half of night. Adrian [2012-01-31 16:50, Modra] Message sent to BinAstPhotSurvey conference

· Observing from 17:00 UT in a good conditions. Michal [2012-01-29 17:03, SkalnatePleso] [Remove]
Message sent to observers

· observed under good conditions nearly full cycle, including most of the .256 phase mutual event. 02:00-06:45UT [2012-01-18 14:16, Via Capote]

· Observed under fair conditions with decreasing transparency from 02:20 to 06:00 UT [2012-01-14 14:36, Via Capote] Message sent to observers

· Don has observed this return binary from Sugarloaf Mountain on three nights, captured two events:
http://www.asu.cas.cz/~asteroid/04607_2011_porb.png
http://www.asu.cas.cz/~asteroid/04607_2011_p1.png
(Note: The periods estimated in the discovery apparition of 2009 were assumed for this starting solution.)

More data, covering mutual events as well as at least one primary rotation outside events are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-12 17.66 0.256
2012- 1-14 1.31 0.256
2012- 1-15 8.96 0.256
2012- 1-16 16.61 0.256
2012- 1-18 0.26 0.256
2012- 1-19 7.91 0.256
2012- 1-20 15.56 0.256
2012- 1-21 23.21 0.256
2012- 1-23 6.86 0.256
2012- 1-24 14.51 0.256
2012- 1-25 22.16 0.256
2012- 1-27 5.81 0.256
2012- 1-28 13.46 0.256
2012- 1-29 21.11 0.256
2012- 1-31 4.76 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-13 9.38 0.753
2012- 1-14 17.03 0.753
2012- 1-16 0.68 0.753
2012- 1-17 8.33 0.753
2012- 1-18 15.98 0.753
2012- 1-19 23.63 0.753
2012- 1-21 7.28 0.753
2012- 1-22 14.93 0.753
2012- 1-23 22.58 0.753
2012- 1-25 6.23 0.753
2012- 1-26 13.88 0.753
2012- 1-27 21.53 0.753
2012- 1-29 5.18 0.753
2012- 1-30 12.83 0.753
2012- 1-31 20.48 0.753

Clear Skies, Petr [2012-01-07 08:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:00 UT under uncertain sky.
Don [2012-01-03 02:42, Sugarloaf]

· Starting a run at 00:40 UT.
Don [2011-12-27 00:16, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting a run at 00:45 UT, Dec 25. Last night's run was lost due to poor conditions.
Don [2011-12-25 00:27, Sugarloaf]

· Started a run at 02:15 UT.
Don [2011-12-24 02:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Just a quick note about my observation on two nights (both are short sessions due to weather) last lunation (Nov 26 and 27). Peter K. [2011-12-15 19:28, Ondrejov]

· An updated solution with three nights by Joe from Prompt of March 15-25:
P_1 = 3.96822 +/- 0.00007 h
P_orb = 31.65 h (error <0.01 h)
D_2/D_1 = 0.30 +/- 0.05
A_1 = 0.15 mag
http://www.asu.cas.cz/~asteroid/04607_p1.png
http://www.asu.cas.cz/~asteroid/04607_porb.png

Cheers, Petr [2009-06-19 14:37, Ondrejov] Message sent to observers

· Observing it from 19:16 UT, on Mar30.

Stefan [2009-03-30 19:32, Modra]

· Started a run at 00:30 UT to catch the secondary event.
Don [2009-03-23 00:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight and should catch the primary event.
Don [2009-03-21 00:27, CarbuncleHill]

· Obtained 3/14-15/2009 (JD 54905) run on Prompt from 2350-0730 UT. Should have 0.763 phase event (~0240-0530) covered. Will attempt to get outside events light curve tonight. Joe. [2009-03-15 19:26, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

· For this one, high quality data especially for secondary events are needed to nail down D_2/D_1. One high-quality night covering the secondary event completely could suffice.
http://www.asu.cas.cz/~asteroid/04607_porb.png
http://www.asu.cas.cz/~asteroid/04607_090117_0207_porb.png

Ephemerides for both events:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 3-14 12.24 0.263
2009- 3-15 19.87 0.263
2009- 3-17 3.50 0.263
2009- 3-18 11.13 0.263
2009- 3-19 18.76 0.263
2009- 3-21 2.39 0.263
2009- 3-22 10.02 0.263
2009- 3-23 17.65 0.263
2009- 3-25 1.28 0.263
2009- 3-26 8.91 0.263
2009- 3-27 16.54 0.263
2009- 3-29 0.17 0.263
2009- 3-30 7.80 0.263
2009- 3-31 15.43 0.263
2009- 4- 1 23.06 0.263
2009- 4- 3 6.69 0.263

Date/Time UTC (LTc.) Phase
--------------------------
2009- 3-13 20.44 0.763
2009- 3-15 4.07 0.763
2009- 3-16 11.70 0.763
2009- 3-17 19.33 0.763
2009- 3-19 2.96 0.763
2009- 3-20 10.59 0.763
2009- 3-21 18.22 0.763
2009- 3-23 1.85 0.763
2009- 3-24 9.48 0.763
2009- 3-25 17.11 0.763
2009- 3-27 0.74 0.763
2009- 3-28 8.37 0.763
2009- 3-29 16.00 0.763
2009- 3-30 23.63 0.763
2009- 4- 1 7.26 0.763
2009- 4- 2 14.89 0.763
2009- 4- 3 22.52 0.763

Clear Skies, Petr [2009-03-13 14:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· The discovery announcement on the binary has appeared on CBET 1716. I update summary web pages here accordingly.

Cheers, Petr

(4607) SEILANDFARM
D. Pray, Carbuncle Observatory, W. Brookfield, MA, U.S.A.; P. Kusnirak
and P. Pravec, Ondrejov Observatory; J. Gross, W. Cooney, and D. Terrell,
Sonoita Research Observatory, Sonoita, AZ; and R. Durkee, Minneapolis, MN,
report that photometric observations obtained during Jan. 17-Feb. 25 reveal
that minor planet (4607) is a binary system with an orbital period of 31.63
± 0.02 hr. The primary shows a period of 3.9683 ± 0.0001 hr, and it has
a lightcurve amplitude of 0.15 mag, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events indicate a lower limit on secondary-to-
primary mean-diameter ratio of 0.29.

2009 March 11 (CBET 1716) Daniel W. E. Green [2009-03-12 07:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this one at 05:45 UT to capture primary event.
Don [2009-03-05 04:20, CarbuncleHill]

· Additional observations by Don (Feb 17 and 18) and by Russ (Feb 19; this was the critical session that nailed down P_orb) have established a solution for this binary (except the size ratio; see below):
P_1 = 3.9682 +/- 0.0001 h
P_orb = 31.63 +/- 0.02 h
D_2/D_1 >= 0.29
A_1 = 0.14-0.15 mag
http://www.asu.cas.cz/~asteroid/04607_porb.png
http://www.asu.cas.cz/~asteroid/04607_p1.png
http://www.asu.cas.cz/~asteroid/04607_090117_0207_porb.png
http://www.asu.cas.cz/~asteroid/04607_090117_0207_p1.png

Data covering the secondary event haven't resolved uniquely whether it is a total eclipse or not. One more high quality session (errors 0.01 mag) covering the secondary event could resolve it and establish D_2/D_1 well (we can give it only as an lower limit now). Predicted events are not well placed for Don soon, so I encourage someone to help out. Secondary event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 2-20 18.27 0.760
2009- 2-22 1.90 0.760
2009- 2-23 9.53 0.760
2009- 2-24 17.16 0.760
2009- 2-26 0.79 0.760
2009- 2-27 8.42 0.760
2009- 2-28 16.05 0.760
2009- 3- 1 23.68 0.760

The primary event has been covered only poorly so far, and though it is not necessary to complete it for a discovery announcement that we will put on CBET, its more coverage will be needed for future modeling of the system. I therefore encourage you to take more observations for the primary event as well (errors of 0.02 mag or better):

Date/Time UTC (LTc.) Phase
--------------------------
2009- 2-21 10.07 0.260
2009- 2-22 17.70 0.260
2009- 2-24 1.33 0.260
2009- 2-25 8.96 0.260
2009- 2-26 16.59 0.260
2009- 2-28 0.22 0.260
2009- 3- 1 7.85 0.260
2009- 3- 2 15.48 0.260

Clear Skies, Petr [2009-02-20 15:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started Run at 3:50 UT.

Russ [2009-02-19 03:49, Shed of Science] Message sent to observers

· Started a run at 02:40 UT.
Don [2009-02-18 03:54, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don has finally confirmed the binary suspect from his Jan25 observations - he captured events on his last two nights of Feb14 and 16. Two solutions for P_orb: 31.6 and 95 h. Plots for the shorter one:
http://www.asu.cas.cz/~asteroid/04607_all.png
http://www.asu.cas.cz/~asteroid/04607_porb.png
http://www.asu.cas.cz/~asteroid/04607_p1.png
A preliminary estimate for D_2/D_1 = 0.28.

It would be good to nail down the orbital period before we announce it on CBET. Observations at any time (with errors <0.03 mag) will be useful, but especially around event times; ephemerides for the two P_orb solutions:

For P_orb = 31.64 h:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 2-17 10.98 0.250
2009- 2-18 18.62 0.250
2009- 2-20 2.26 0.250
2009- 2-21 9.90 0.250
2009- 2-22 17.54 0.250
2009- 2-24 1.18 0.250
2009- 2-25 8.82 0.250
2009- 2-26 16.46 0.250
2009- 2-28 0.10 0.250
2009- 3- 1 7.74 0.250
2009- 3- 2 15.38 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2009- 2-18 2.79 0.750
2009- 2-19 10.43 0.750
2009- 2-20 18.07 0.750
2009- 2-22 1.71 0.750
2009- 2-23 9.35 0.750
2009- 2-24 16.99 0.750
2009- 2-26 0.63 0.750
2009- 2-27 8.27 0.750
2009- 2-28 15.91 0.750
2009- 3- 1 23.55 0.750

For P_orb = 94.92 h:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 2-18 2.82 0.250
2009- 2-22 1.74 0.250
2009- 2-26 0.66 0.250
2009- 3- 1 23.58 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2009- 2-20 2.23 0.750
2009- 2-24 1.15 0.750
2009- 2-28 0.07 0.750

Clear Skies, Petr [2009-02-17 10:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 3:55 UT.
Don [2009-02-17 05:35, CarbuncleHill]

· Plan to start a run at 02:40 UT.
Don [2009-02-16 01:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 03:40 UT.
Don [2009-02-07 04:14, CarbuncleHill]

· Started a run at 03:35 UT.
Don [2009-02-05 03:54, CarbuncleHill]

· Three long, good SNR sessions by Don from Carbuncle and John from SRO nailed down the period: 3.9682 +/- 0.0002 h.
http://www.asu.cas.cz/~asteroid/04607.png
(Three other, higher noise sessions by David and Don are consistent.) The drop by 0.07 mag on January 25 that may be a mutual event remains to be confirmed,
http://www.asu.cas.cz/~asteroid/04607_090125.png
More observations (long sessions with errors <=0.03 mag) are needed.

Clear Skies, Petr [2009-02-02 15:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 03:40 UT.
Don [2009-02-02 03:41, CarbuncleHill]

· Observed from 12:35UT to 18:07 in poor conditions. Possible period of 4.01 +/- 0.02hrs with an amplitude of 0.22 +/- 0.03mag [2009-01-31 20:54, HuntersHill] Message sent to observers

· Observed from 12:37UT to 17:53UT in poor conditions. [2009-01-31 01:46, HuntersHill]

· We ran this 2 nights ago. Data sent to Petr.

John G [2009-01-30 05:49, Sonoita] Message sent to observers

· Will start a rub at 04:00. I should get a little more than 6 hours on it. [2009-01-29 23:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don has taken two and half nightly sessions for this one. Its period appears nearly commensurate with 1 day, one of possible periods:
http://www.asu.cas.cz/~asteroid/04607.png
There is a deviation that may be a binary mutual event, or it may be a feature of a longer-period, more complex lightcurve. More data (long sessions) from at least two stations at different longitudes are needed. The asteroid is dimmer than predicted from the astrometric H, so check if you can get the required photometric accuracy (errors <=0.03 mag) before devoting a full night to it.

Clear Skies, Petr [2009-01-27 10:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 04:30 UT.
Don [2009-01-25 04:30, CarbuncleHill]

· Did runs on this on Jan 16 and 17. Object appears dimmer than expected.
Don [2009-01-18 22:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(10236) 1998 QA93 (Finished) - binary suspect [Add new note]
· Good observations of this binary suspect by Don Pray from Sugarloaf Mountain in this apparition, but no attenuation catched. Target closed for now.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:20, Ondrejov]

· Started this return binary candidate on Aug 25.
Don [2022-08-26 19:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray observed this new target from Sugarloaf Mountain on 6 nights. Got deviations on 3 of them (see the x-ed points in the second plot below), suggesting a binary nature.
http://www.asu.cas.cz/~asteroid/10236_2019a_p1.png
http://www.asu.cas.cz/~asteroid/10236_2019a_porb.png
http://www.asu.cas.cz/~asteroid/10236_2019b_p1.png

The target is well past opposition now and in crowded star fields in the Milky Way; we close it now and it will need to be confirmed in a future apparition.

Petr [2020-02-06 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this Jan 30 UT.
Don [2020-01-29 23:56, Sugarloaf]

· I observed this one last night (Jan 22 UT).
Don [2020-01-22 13:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray observed this new target from Sugarloaf Mountain on 3 nights. There appear to be two attenuations; a tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/10236_2019a_porb.png
http://www.asu.cas.cz/~asteroid/10236_2019a_p1.png

More data (errors < 0.02 mag) are needed to establish it.

Clear Skies, Petr [2020-01-22 08:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one last night, Jan 21 UT.
Don [2020-01-21 16:29, Sugarloaf]

· Doing a run on this tonight,
Don [2019-12-24 01:53, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this last night and am running it tonight, Dec 21 UT.
Don [2019-12-21 01:19, Sugarloaf]

(8424) Toshitsumita (Finished) [Add new note]
· Russ Durkee observed this new target from Shed of Science South on 4 nights: Good solution, one suspect attenuation seen, needs to be confirmed in the future.
https://www.asu.cas.cz/~asteroid/08424.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started on this again tonight.

Russ [2021-09-17 02:05, Shed of Science] Message sent to observers

· Started a run on this

Russ [2021-09-16 01:59, Shed of Science]

· Started a run on this new object 9/12 1UT.

Russ [2021-09-12 15:39, Shed of Science] Message sent to BinAstPhotSurvey conference

(7070)1994 YO2 (Finished) [Add new note]
· Russ Durkee observed this new target from Shed of Science South on 2 nights: U = 2+ or 3- solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07070.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this one last night and will do another tonight.

Russ [2022-01-06 03:09, Shed of Science]

(4555) Josefaperez (Finished) - binary suspect [Add new note]
· Don Pray observed this binary suspect from Sugarloaf Mountain on 3 nights, no deviation captured:
https://www.asu.cas.cz/~asteroid/04555_c1.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at about 02:00 UT.
Don [2021-10-07 01:34, Sugarloaf]

· I did a run on this on Oct 1 UT.
Don [2021-10-01 21:37, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4338) Velez (Finished) [Add new note]
· This new target was done by Vladimir Benishek from Sopot and by Russ Durkee from Shed of Science South: Good solution and coverage, no significant deviation.
https://www.asu.cas.cz/~asteroid/04338.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.

Russ [2022-07-20 03:59, Shed of Science] Message sent to observers

· I also have a few nights on this one.

Russ [2022-07-02 14:58, Shed of Science]

· Started this new target last night.
Vladimir [2022-06-27 11:32, Sopot AO] Message sent to BinAstPhotSurvey conference

(3382) Cassidy (Finished) [Add new note]
· Russ Durkee observed this binary suspect from Shed of Science South on 4 nights, no deviation captured:
http://www.asu.cas.cz/~asteroid/03382_c2.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting on this one tonight.

Russ [2022-09-20 02:01, Shed of Science] Message sent to observers

· Did a run on this on 9/17. Will continue to follow as weather permits. [2022-09-18 15:14, Shed of Science] Message sent to BinAstPhotSurvey conference

· Closing this binary suspect.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
It needs to be confirmed in the future.

Petr [2018-09-14 11:06, Ondrejov]

· observed on 05/05, 05/08, 05/09
good condition with possible event detected [2018-05-12 07:49, Blue Mountains Obs] Message sent to observers

· Start observing this prime suspect [2018-04-25 06:06, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Joe Pollock did this new target with the DSO 32" and with PROMPT: an U = 3- solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/03382.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Joe, fast and precise.

Cheers, Petr [2012-10-01 07:39, Ondrejov] Message sent to BinAstPhotSurvey conference

(3057) Malaren (Finished) [Add new note]
· This new target was done by Vladimir Benishek from Sopot and by Russ Durkee from Shed of Science South: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03057.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-23 12:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· I am going to do a run on this tonight.
Russ [2022-05-01 02:07, Shed of Science] Message sent to observers

· I obtained several short data sets on this new target.
Vladimir [2022-03-29 01:01, Sopot AO] Message sent to BinAstPhotSurvey conference

(6109) Balseiro - binary suspect, more data needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. Solution is not clear yet; a tentative solution for the main (primary) period:
https://www.asu.cas.cz/~asteroid/06109.png

More data (errors <= 0.02 mag) are needed to establish it.

Clear Skies, Petr [2022-09-23 07:44, Ondrejov] Message sent to BinAstPhotSurvey conference

(6084) Bascom (Finished) - binary [Add new note]
· Insufficient data taken for this one in this apparition. Target closed. Petr [2022-09-18 11:08, Ondrejov]

· I've done 2 runs on this so far.
Don [2022-08-06 22:28, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for the 4th apparition. Petr [2020-02-06 12:33, Ondrejov]

· Following later tonight. Russ [2019-12-24 02:34, Shed of Science] Message sent to observers

· We at Ondrejov and Don Pray at Sugarloaf Mountain took first data for this return binary in its current 4th apparition. There is present a shallow event:
http://www.asu.cas.cz/~asteroid/06084_2019a_porb.png
http://www.asu.cas.cz/~asteroid/06084_2019a_p1.png

More data for the events are needed to improve our model of the binary. Errors of 0.01 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019-12-22 15.39 0.253
2019-12-24 10.89 0.253
2019-12-26 6.39 0.253
2019-12-28 1.89 0.253
2019-12-29 21.39 0.253
2019-12-31 16.89 0.253
2020- 1- 2 12.39 0.253
2020- 1- 4 7.89 0.253
2020- 1- 6 3.39 0.253
2020- 1- 7 22.89 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2019-12-23 13.12 0.753
2019-12-25 8.62 0.753
2019-12-27 4.12 0.753
2019-12-28 23.62 0.753
2019-12-30 19.12 0.753
2020- 1- 1 14.62 0.753
2020- 1- 3 10.12 0.753
2020- 1- 5 5.62 0.753
2020- 1- 7 1.12 0.753

Clear Skies, Petr [2019-12-22 07:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Insufficient data, target closed. [2017-04-13 08:59, Ondrejov]

· Doing a run tonight in the hours before clouds arrive.
Don [2017-03-24 01:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this at 01:40 UT.
Don [2017-03-21 01:55, Sugarloaf]

· Interpretation problematic due to short sessions with uncertain linkage. Target closed. Petr [2015-09-29 11:43, Ondrejov]

· I plan to start a run at 04:40 UT.
Don [2015-08-10 02:19, Sugarloaf] Message sent to observers

· I'll be starting this at 04:50 UT.
Don [2015-08-08 01:25, Sugarloaf]

· I'll be starting this at 04:55 UT.
Don [2015-08-06 02:15, Sugarloaf]

· I plan to start this at 05:20 UT.
Don [2015-07-24 02:00, Sugarloaf] Message sent to observers

· I did a run on this July 23 UT.
Don [2015-07-23 13:34, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Last data before this apparition ends would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3-30 18.41 0.252
2013- 4- 1 13.91 0.252
2013- 4- 3 9.41 0.252
2013- 4- 5 4.91 0.252
2013- 4- 7 0.41 0.252
2013- 4- 8 19.91 0.252
2013- 4-10 15.41 0.252
2013- 4-12 10.91 0.252
2013- 4-14 6.41 0.252
2013- 4-16 1.91 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3-31 16.14 0.752
2013- 4- 2 11.64 0.752
2013- 4- 4 7.14 0.752
2013- 4- 6 2.64 0.752
2013- 4- 7 22.14 0.752
2013- 4- 9 17.64 0.752
2013- 4-11 13.14 0.752
2013- 4-13 8.64 0.752
2013- 4-15 4.14 0.752

Clear Skies, Petr [2013-03-25 07:25, Ondrejov]

· Don Pray has taken five nights from Sugarloaf Mountain for this return binary in its current 3rd apparition so far:
http://www.asu.cas.cz/~asteroid/06084_13_porb.png
http://www.asu.cas.cz/~asteroid/06084_13_p1.png

More data are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3- 1 18.41 0.252
2013- 3- 3 13.91 0.252
2013- 3- 5 9.41 0.252
2013- 3- 7 4.91 0.252
2013- 3- 9 0.41 0.252
2013- 3-10 19.91 0.252
2013- 3-12 15.41 0.252
2013- 3-14 10.91 0.252
2013- 3-16 6.41 0.252
2013- 3-18 1.91 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2013- 2-28 20.64 0.752
2013- 3- 2 16.14 0.752
2013- 3- 4 11.64 0.752
2013- 3- 6 7.14 0.752
2013- 3- 8 2.64 0.752
2013- 3- 9 22.14 0.752
2013- 3-11 17.64 0.752
2013- 3-13 13.14 0.752
2013- 3-15 8.64 0.752
2013- 3-17 4.14 0.752
2013- 3-18 23.64 0.752

Clear Skies, Petr [2013-02-26 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 23:30, Feb 18 UT.
Clouds may interfere later.
Don [2013-02-18 23:58, Sugarloaf]

· Don Pray took four sessions for this one from Sugarloaf Mountain in its current 3rd apparition:
http://www.asu.cas.cz/~asteroid/06084_13_porb.png
http://www.asu.cas.cz/~asteroid/06084_13_p1.png

More data for both events are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 2-13 10.91 0.252
2013- 2-15 6.41 0.252
2013- 2-17 1.91 0.252
2013- 2-18 21.41 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2013- 2-12 13.14 0.752
2013- 2-14 8.64 0.752
2013- 2-16 4.14 0.752
2013- 2-17 23.64 0.752
2013- 2-19 19.14 0.752

Clear Skies, Petr [2013-02-11 16:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:15 UT. Clouds should hold off a few hours.
Don [2013-02-11 00:53, Sugarloaf]

· I started a run at 00:15 UT in somewhat breezy conditions.
Don [2013-02-10 02:04, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run at 03:00 UT. Hopefully, conditions will hold.
Don [2013-01-19 02:58, Sugarloaf]

· Plan to start a run on this at 04:10 UT.
Don [2013-01-03 04:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Did a run on Dec 26 UT.
Don [2012-12-26 22:03, Sugarloaf]

· The returning binary has been observed by David Higgins from Hunters Hill (6 nights) and by Ginaluca Masi from La Silla (1 night). It hasn't shown events in the current geometry:
http://www.asu.cas.cz/~asteroid/06084_08_p1.png
http://www.asu.cas.cz/~asteroid/06084_08_porb.png

During the rest of this apparition, its geometry will evolve further away from eclipse geometry, so we close the campaign on the binary.

Good work, David and Gianluca. Your negative observations in this apparition will constrain a model of the binary system (though we will need at least one more apparition to get it).

Cheers, Petr [2008-09-19 07:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-09-10 from 10:13UT to 19:08UT in good conditions. Period refined to 2.74524 +/- 0.00009hrs with an amplitude of 0.16 +/- 0.01mag. No deviations noted. I believe this target is now done. [2008-09-10 22:10, HuntersHill] Message sent to observers

· Observed 2008-09-09 from 10:37UT to 19:09UT in good conditions. Period refined to 2.74521 +/- 0.000011hrs with an amplitude of 0.16 +/- 0.01 mag. A small deviation noted. [2008-09-09 21:48, HuntersHill]

· Observed 2008-09-02 from 10:26UT to 18:06UT is poor conditions (cloud). Data refined the period to 2.7453 +/- 0.0003hrs. No deviations noted. [2008-09-02 22:20, HuntersHill] Message sent to observers

· Observed 2008-09-01 from 10:27UT to 18:52UT in reasonable conditions (some wind). Lost a few data points due to trailing and interfering stars - starBgone couldn't help as the target moved across the CCD's entire field. Period refined to 2.7454 +/- 0.0003hrs with an amplitude of 0.17 +/- 0.01mag [2008-09-01 22:24, HuntersHill] Message sent to observers

· If you receive this via the BinAstPhotSurvey mailing list, the mail sending from the binast-webtool works again. Thanks to the server managers for setting the spam blocking filter properly.

Cheers, Petr [2008-08-29 12:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-08-26 from 10:57UT to 19:42UT in reasonable conditions. Period refined to 2.746 +/- 0.001 hrs with an amplitude of 0.17 +/- 0.01 mag with a possible attenuation observed around 17:00-18:00UT. [2008-08-27 03:33, HuntersHill] Message sent to observers

· Observed 2008-08-24 from 11:06UT to 19:27UT in reasonable conditions. First clear night in a very long time (well nearly all clear) though I did waste half the night on an already completed target (929) Doh......

Initial data points to a period of 2.81hrs +/- 0.04 hrs with an amplitude of 0.15 +/- 0.01mag. [2008-08-24 22:06, HuntersHill] Message sent to BinAstPhotSurvey conference

· This binary will be already relatively faint (V>16.5) during this lunation, so I don't think that anyone of us will get good follow-up observations for it. So, we may consider this one as finished for the BinAstPhotSurvey.

Cheers, Petr [2006-03-16 15:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in
2006-02-02.9 by Stefan and Jozo from Modra
2006-02-08.6 and 09.6 by David from Hunters Hill
The Modra session has covered the 0.25-phase event, showing that it narrowed in the same way as did the 0.75-phase event on 02-02.0. The two David's nights have covered phases outside the events, they were useful for definition of the short period. The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png
Basic parameters remain unchanged since the CBET dicovery announcement. Petr Scheirich is beginning to model the system in more details.

The recent evolution of the events indicated that the system was moving out of the eclipse/occultation geometry. We cannot say yet whether it will continue in this lunation, but it is possible that the events will be further vanishing. Follow-up observations of the mutual events is therefore needed. Approximate ephemerides (uncertain to about 1 h) for the events are enclosed below. Because of its uncertainty (due to basically that we don't know yet an exact geometry of the system), a full-night coverage is highly recomended to catch the event even if it further evolves. Errors not greater than 0.03 mag are needed.

Date/Time UTC (LTc.) Phase
--------------------------
2006- 2-15 14.91 0.266
2006- 2-17 10.41 0.266
2006- 2-19 5.91 0.266
2006- 2-21 1.41 0.266
2006- 2-22 20.91 0.266
2006- 2-24 16.41 0.266
2006- 2-26 11.91 0.266
2006- 2-28 7.41 0.266

Date/Time UTC (LTc.) Phase
--------------------------
2006- 2-16 12.51 0.762
2006- 2-18 8.01 0.762
2006- 2-20 3.51 0.762
2006- 2-21 23.01 0.762
2006- 2-23 18.51 0.762
2006- 2-25 14.01 0.762
2006- 2-27 9.51 0.762
2006- 3- 1 5.01 0.762

Cheers, Petr [2006-02-15 09:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a clear night again but the session was auto terminated mid session due to what looks like cloud. Data sent to Petr. [2006-02-09 21:36, HuntersHill]

· Got a clear night and a run on this target last night. Nothing new to report - data sent to Petr. [2006-02-08 21:32, HuntersHill] Message sent to BinAstPhotSurvey conference

· Our discovery announcement has been published on CBET 389. I enclose the text of the circular for your convenience below. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr

(6084) BASCOM
D. Higgins, Canberra, Australia; P. Pravec, P. Kusnirak,
and L. Sarounova, Ondrejov Observatory; and S. Gajdos, A. Galad,
and J. Vilagi, Modra Observatory, report that photometric
observations obtained during 2005 Dec. 29-2006 Feb. 2 reveal
that minor planet (6084) is a binary system with an orbital
period of 43.5 hours. The primary rotates with a period of
2.7454 hours, and it has a lightcurve amplitude of 0.22 mag.
Mutual eclipse/occultation events that are 0.12- to 0.18-mag
deep indicate a secondary-to-primary mean-diameter ratio of 0.37
±0.02. The mean absolute R magnitude of the system is 12.8
± 0.1.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 February 6 (CBET 389) Daniel W. E. Green [2006-02-07 11:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· we expect clear skies, trying to cover the critical phase .755 event tonight...hope the seeing gets better, jozef [2006-02-02 19:14, Modra]

· Data from four nights of 2006-01-28.9, 30.0, 31.0, and 02-02.0 by Peter Kusnirak and Lenka Sarounova from here joined in. The first three nigths covered orbital phases outside of eclipses (their purpose is to describe secondary's rotation after reduction of their calibrations that Peter does as well), the fourth night covered the primary event around phase 0.75. It showed a further evolution of the event, see comments further below. The current solution
Pprim= 2.7454 (error <0.0001 h)
Porb= 43.5 h (error <0.1 h; see also comments below)
Aprim= 0.22 mag
Ds/Dp= 0.37 +/-0.02
See pictures
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png
http://www.asu.cas.cz/~ppravec/bascom_contacts_060123_24.png

This binary has provided us a challenge (but also an advantage, that may look paradoxical at the first glance, but is actually logical): Since it is a relatively wide system with Porb of 43.5 h (the longest orbital period we have seen so far among photometrically detected binaries) that gives a relatively large semimajor axis of the system's orbit of about 3.6 primary diameters, events occur less frequently in it than in our other binaries, so it is a bit of challenge to cover them. (This difficulty has been exacerbated also by the fact that nightly runs could not be longer than about seven hours from any station for this object.) The relatively large distance between the two bodies of the system also means that the events evolve relatively rapidly; prominent changes occur on a scale of a few days. On one hand, it means that we need to take reliable data covering events, as we cannot directly confirm one night's data with another one covering the same event a few days later, as the event may evolve appreciably in the meantime. On the other hand, the rapid evolution of the events provides us an opportunity to get enough data for more detailed modeling of the system sooner than in other, closer systems (that evolve slower). So, with this wider system, we have in fact already moved to a follow up phase. Petr S. will do a first try of his modeling software on this system here in the next week. In any case, it is a time for us (David et al.) to announce the discovery on CBET now.

Great work all so far!

Cheers, Petr [2006-02-02 09:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing Bascom from 19:40 UT and expecting full-night run (if weather allows). I'm covering an event around the phase 0.75 tonight.

Peter K. [2006-02-02 01:24, Ondrejov]

· Observing Bascom from 19:40 UT and expecting full-night run (if weather allows). It will be only complementary target for (9617) Grahamchapman but should help in the secondary's rotation analysis (no event for me tonight).

Peter K. [2006-01-29 19:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· David,

Too bad you are down with the weather. So, your next opportunity for the 0.75-phase event is on February 5, right? There are four events predicted for the meantime:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-29 8.88 0.755
2006- 1-31 4.35 0.755
2006- 2- 1 23.82 0.755
2006- 2- 3 19.29 0.755

I hope someone from America or from Europe will be able to help out with the events of Jan 29 or 31 or with the one of Feb 1, that should finish the discovery phase for this one.

Petr

Btw: On the meantime, Peter K. is covering orbital phases between the events with linked observations, that will nail down the secondary's rotation eventually. [2006-01-28 11:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Thunderstorms last night prevented my observing phase 0.75. I won't get another opportunity at this phase until 05 March at the earliest. [2006-01-27 20:52, HuntersHill]

· Data by David from Hunters Hill of 2006-01.26.6 joined in. They suggest a further evolution (narrowing) of the event around orbital phase 0.25, but it will need to be confirmed by further follow up observations. Anyway, we are close to finishing a discovery phase for this tough one. Calibrations by Peter K. of three Ondrejov nights included in the solutioon as well, they indicate H_R=12.77 +/-0.1 and they will define secondary's rotational component better when they are more abundant after further follow up.
The current data see:
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png

Ok, one more coverage of the event around orbital phase 0.75 remains to complete the discovery phase for this one.

Cheers, Petr [2006-01-27 08:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed run at 17:40 (a little over 7 hours) and have at least part of an event (I hope). Data sent on to Petr. [2006-01-26 19:15, HuntersHill]

· Commenced run at 10:30 UT and hopeful of a 6.5 hour run so I hope to capture part of phase 0.255 [2006-01-26 11:20, HuntersHill] Message sent to BinAstPhotSurvey conference

· Data by Peter Kusnirak from here of 2006-01-24.0 joined in. They cover most of the event around orbital phase 0.75. Like the event around phase 0.25 observed on the previous night, it is narrower now than it was in the previous lunation, that may be related to the decreasing solar phase. The recent data covering both events indicate that the event around orbital phase 0.75 is primary while the one around phase 0.25 is secondary, that was not obvious from the lower quality data of the 0.25-phase event of the previous lunation and also because of higher solar phase that apparently caused a separation of occultation and eclipse phenomena in the better covered event of phase 0.75 then a few weeks ago. So, we are nailing down the solution with new data coming. After we cover each of the two events once again well, I expect it should be already nailed down sufficiently and we will close the discovery phase for this one and publish a discovery announcement. An updated solution see following pictures:
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png
An estimate of Ds/Dp from the secondary event is 0.33 (error of a few 0.01).

Updated ephemerides for the primary and the secondary events, respectively:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-25 17.94 0.755
2006- 1-27 13.41 0.755
2006- 1-29 8.88 0.755
2006- 1-31 4.35 0.755
2006- 2- 1 23.82 0.755
2006- 2- 3 19.29 0.755
2006- 2- 5 14.76 0.755
2006- 2- 7 10.23 0.755

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-24 20.23 0.255
2006- 1-26 15.70 0.255
2006- 1-28 11.17 0.255
2006- 1-30 6.64 0.255
2006- 2- 1 2.11 0.255
2006- 2- 2 21.58 0.255
2006- 2- 4 17.05 0.255
2006- 2- 6 12.52 0.255
2006- 2- 8 7.99 0.255

Cheers, Petr [2006-01-24 09:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:15 UT and expecting almost 7-hours long run. [2006-01-23 21:28, Ondrejov]

· Data by Peter Kusnirak from here of 2006-01-23.0 joined in. Despite being cut a bit short (4.2 h duration) due to poorer conditions in the evening, they cover the event around orbital phase 0.25 fully (for the first time in this binary!) An updated solution see following pictures:
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png
The orbital period looks to be about 43.45 h (error of a few 0.01 h), but it needs to be nailed down with a second good coverage of the event. The other event (around orbital phase 0.75) needs to be covered as well. Btw, the apparently shorter duration of the last night's event may be related to decreasing solar phase, but we cannot tell much from it until the solution is nailed down.

Updated ephemerides for the events:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-24 20.15 0.258
2006- 1-26 15.60 0.258
2006- 1-28 11.05 0.258
2006- 1-30 6.50 0.258
2006- 2- 1 1.95 0.258
2006- 2- 2 21.40 0.258
2006- 2- 4 16.85 0.258
2006- 2- 6 12.30 0.258
2006- 2- 8 7.75 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-23 22.07 0.750
2006- 1-25 17.52 0.750
2006- 1-27 12.97 0.750
2006- 1-29 8.42 0.750
2006- 1-31 3.87 0.750
2006- 2- 1 23.32 0.750
2006- 2- 3 18.77 0.750
2006- 2- 5 14.22 0.750
2006- 2- 7 9.67 0.750

Cheers, Petr [2006-01-23 04:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two David's nights of 2006-01-20.6 and 21.6 joined in. They cover phases outside of mutual events, fit well with the short period (2.7454 h with error <0.0001 h). Updated solution in following pictures
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png
A coverage of mutual events is needed before we may finish the discovery phase for this one. I encourage everyone able to work it with sufficient quality (errors <=0.02 mag, long sessions) to contribute. The ephemerides for the events below on this page are still valid.

Cheers, Petr [2006-01-22 11:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another full nights data an no mutual event (none expected either). Data sent to Petr

I have further resolved Pprim to 2.74526hr +/- 0.00009hrs [2006-01-22 00:29, HuntersHill]

· Thunderstorm has passed so have commenced (10:50UT) another run on this target. [2006-01-21 11:02, HuntersHill] Message sent to BinAstPhotSurvey conference

· Got just over 6 hours of reasonably good data - sent on to Petr. [2006-01-21 01:35, HuntersHill]

· Commenced run 10:45 UT - not confident of a long session [2006-01-20 10:47, HuntersHill] Message sent to BinAstPhotSurvey conference

· Data of 2006-01-14.0 by Adrian from Modra joined in. Despite a somewhat higher noise due to the bright Moon, they fit reasonably well, the period estimates remain unchanged, see
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png
A good coverage of the event when the Moon is out its way is still needed.

Cheers, Petr [2006-01-16 14:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Three recent nights were devoted to this. The conditions were worsening due to approaching Moon. The primary event was fully covered in the last session.

Adrian [2006-01-14 03:52, Modra]

· New data joined in:
2006-01-11.0 by Lenka Sarounova from here
2006-01-12.0 by Adrian Galad from Modra
They fit well with the preliminary solution (though the Ondrejov data will need to be rereduced with a new flat later on). As predicted by the preliminary model, Adrian has caught a mutual event before the end of the last night. Porb is estimated to be 43.4 h (error <0.1 h). Pprim is refined to 2.7453 h (error ~0.0001 h). A preliminary estimate for Ds/Dp is 0.31 +/-0.03. The current solution see pictures:
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png

We need to nail down the solution through improving the coverage. Indeed, some orbital phases are covered poorly, see the 2nd picture above, and especially the events need to be covered well. (Indeed, being able to cover just ~5 hours on one night from one station means that we need several more nights for this relatively long-period system.) Ephemerides for both events follow:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-13 23.11 0.255
2006- 1-15 18.51 0.255
2006- 1-17 13.91 0.255
2006- 1-19 9.31 0.255
2006- 1-21 4.71 0.255
2006- 1-23 0.11 0.255
2006- 1-24 19.51 0.255
2006- 1-26 14.91 0.255
2006- 1-28 10.31 0.255
2006- 1-30 5.71 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-13 0.97 0.745
2006- 1-14 20.37 0.745
2006- 1-16 15.77 0.745
2006- 1-18 11.17 0.745
2006- 1-20 6.57 0.745
2006- 1-22 1.97 0.745
2006- 1-23 21.37 0.745
2006- 1-25 16.77 0.745
2006- 1-27 12.17 0.745
2006- 1-29 7.57 0.745
2006- 1-31 2.97 0.745

Cheers, Petr [2006-01-12 10:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data of 2006-01-10.0 by Stefan Gajdos and Adrian Galad from Modra joined in. They cover orbital phases outside of events (consistent with the preliminary orbital period of 43.4 h), and they refine the primary's period to 2.7454 h (formal error 0.0001 h). The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png

Clear Skies, Petr [2006-01-10 18:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006-01-08.6 by David from Hunters Hill
2006-01-09.0 by Stefan and Jozef from Modra
The David's data are a bit more noisy than his other data (perhaps due to the hot humidity and fast moving thin clouds that he mentioned), but they still contribute to the solution, they also cover a part of an attenuation event. The Modra data are of very good quality and they cover orbital phases outside mutual events. The short period is refined to 2.7452 h. A preliminary estimate of the orbital period is 43.4 h, but it needs to be confirmed with more data; it is indeed neeeded to cover the orbital period more thoroughly, see pictures:
http://www.asu.cas.cz/~ppravec/bascom_all.png
http://www.asu.cas.cz/~ppravec/bascom_longpc.png
http://www.asu.cas.cz/~ppravec/bascom_shortpc.png

Cheers, Petr [2006-01-09 07:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· We started with it on Jan08, 21:40UT (perhaps link to David's effort). Planned up to 03:15UT, if backgroud stars permit.

Stefan/Jozef [2006-01-09 01:23, Modra]

· 8th night, data did not match up well but this could be an attenuation or it could be issues related to a hot humid night and fast moving thin clouds! [2006-01-08 21:42, HuntersHill] Message sent to BinAstPhotSurvey conference

· Hi David,

Indeed, it is a probable binary. The short period is well determined, 2.745 h (error <0.001 h). The deviations on the first, second, and the last of your six nights look to be attenuation events. A solution for their period is rather preliminary for now, but it looks to be relatively long, on an order of 40 hours. I will send pictures through the yahoogroups (sorry, our web server still has a problem, it should be fixed tomorrow when the system manager comes to work). Observations from a few stations over the globe should be needed to establish its orbital period well. (Btw, if confirmed, its orbital period will be one of the two longest, with 2000 DP107 that have Porb=42.2 h, observed in photometrically detected asynchronous binaries.)

Cheers, Petr [2006-01-08 11:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Session ended 15 minutes earlier than planned due to mornign cloud. Data refined the solution but I got another deviation. New solution 2.7445 +/- 0.0002hrs. Amplitude not including dviations is 0.25m but with deviations is 0.4m +/- 0.02m

I calibrated the images via 2 different methods and re-measured 3 times - I can't see any problems in the data but have sent it all on to Petr for further analysis.

http://users.bigpond.com/higginsdj/6084Bascom.htm [2006-01-08 00:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started 7th night at 11:45UT. Doing this target and new target (85804) 1998 WQ5. [2006-01-07 13:26, HuntersHill]

· 6th night clouded out after only 2 hours. Data was useful in that it fit the exting plot so refined the period to 2.7442h +/- 0.0004hrs. The only deviation from the main curve can be attributed to the onset of cloud.

http://users.bigpond.com/higginsdj/6084Bascom.htm [2006-01-07 02:14, HuntersHill] Message sent to BinAstPhotSurvey conference

· Session ended due to cloud 14:40 UT. Data discarded due to interferance from background stars. [2006-01-03 15:17, HuntersHill]

· 5th night commenced 12:15UT [2006-01-03 12:31, HuntersHill] Message sent to BinAstPhotSurvey conference

· Petr is likely right though I cannot see anything specifically wrong with the data and I have remeasured the data using all different comp stars. However, given the high temps we've been having, I cannot cool the CCD to the usual level which resulted in a higher number of stray hot pixels. I removed data where the hot pixel was visible but I can't tell if it occurs within the target itself!

No sign of any events in last nights run. Period further refined to 2.7440 +/- 0.0006hrs with a likely amplitude of 0.25 +/- 0.02mag.

http://users.bigpond.com/higginsdj/6084Bascom.htm [2006-01-03 01:04, HuntersHill] Message sent to BinAstPhotSurvey conference

· David has sent me his three nights for this one as it looked suspicious to him as well as to Brian Warner. Well, the mutliple peak solution is suspicious, it may be rather a period of 2.74 h with a few deviations superimposed. The deviations may be real (possible mutual events), but since they occured at beginnnings or ends of the sessions, and they also have mostly higher errors (too bright sky or too low in the sky ?), it is needed to confirm them with more data. Good long sessions are needed.

Cheers, Petr [2006-01-02 14:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· 4th nights run commenced 12:10UT. [2006-01-02 14:41, HuntersHill]

· I have no expectations of being able to follow-up this target for the next 2 nights due to 20-50kph winds and an approaching frontal system. [2006-01-01 01:40, HuntersHill] Message sent to BinAstPhotSurvey conference

· Complete run with what appears to be good data but the curves not not match up well - Mutual Event(s)?

Best fit is 4 peaks at 5.491 hr +/- 0.004hr with an amplitude a little over 0.4mag +/- 0.02mag (Same period was derived for each individual curve)

http://users.bigpond.com/higginsdj/6084Bascom.htm [2006-01-01 00:27, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced 3rd nights run at 12:10UT.

Its now 13:00 UT - Happy New Year all from downunder. [2005-12-31 13:02, HuntersHill]

· 2nd night completed. Some interferance from background stars but the data still shows 3 peaks. Combined with night 1 I have a period of 5.49hrs. Still early days on this one.

http://users.bigpond.com/higginsdj/6084Bascom.htm [2005-12-31 00:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced run on this target at 12:30 UT [2005-12-30 12:45, HuntersHill]

· 4.5 hour run complete. Initial analysis shows 3 distinct peaks in that 4.5 hours and an initial solution of 4.45hrs fits that data. Obviously more data is required. Amplitude of data 0.36m +/- 0.02m.

http://users.bigpond.com/higginsdj/6084Bascom.htm [2005-12-30 02:41, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced run on this target at 12:30 UT. [2005-12-29 12:52, HuntersHill]

(2195)Tengstrom (Finished) - prime suspect [Add new note]
· This returned "prime suspect" was observed by Don Pray from Sugarloaf Mountain, by Russ Durkee from Shed of Science South, and by Romain Montaigut and Arnaud Leroy from OPERA in the last apparition. Two suspect attenuations observed by Don on 2021-12-14 were not confirmed with further observations.
https://www.asu.cas.cz/~asteroid/02195_2021a.png
https://www.asu.cas.cz/~asteroid/02195_2021b.png
https://www.asu.cas.cz/~asteroid/02195_2021c.png
https://www.asu.cas.cz/~asteroid/02195_2021d.png
https://www.asu.cas.cz/~asteroid/02195_2021e.png

Petr [2022-09-18 10:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will do a run on this one tonight.

Russ [2022-01-13 01:47, Shed of Science] Message sent to observers

· Planning to start this one at 01:40 UT.
Don [2022-01-12 01:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Did a run on this last night and will be following it tonight again.

Russ [2022-01-06 03:08, Shed of Science]

(1290) Albertine (Finished) [Add new note]
· This returned "prime suspect" was observed by Russ Durkee and by Patrick Sogorb: Good solution and coverage, no significant deviation.
https://www.asu.cas.cz/~asteroid/01290_2022b.png
https://www.asu.cas.cz/~asteroid/01290_2022a.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-16 09:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this last night. Will continue to follow as I can.

Russ [2022-01-04 02:17, Shed of Science]

· Despite the low amplitude, it is an U = 2 result from observations by Don Pray from Sugarloaf Mountain and Vladimir Benishek from Sopot. No prominent deviation apparent.
http://www.asu.cas.cz/~asteroid/01290_2017.png
http://www.asu.cas.cz/~asteroid/01290_2017_nsp.png
http://www.asu.cas.cz/~asteroid/01290_2006.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-11-10 09:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Oct 23.
Don [2017-10-23 15:53, Sugarloaf] Message sent to observers

· Starting this at 01:15, Oct 19 UT.
Don [2017-10-18 23:42, Sugarloaf]

· Starting this one at 01:25, Oct 18 UT.
Don [2017-10-17 23:58, Sugarloaf]

· This new target was observed on three nights (Oct. 13-14, Oct. 14-15 and Oct. 16 UT).
Vladimir [2017-10-16 14:00, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed for 1.5 h only, then ended by clouds. Peter K. [2006-12-11 18:37, Ondrejov]

· Observing from 19:10 UT. Light layer of Cs at the moment, but expecting fine weather conditions soon. Michal [2006-09-21 19:14, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Observing from 19:15 UT. Expecting satisfactory weather condition tonight.Michal [2006-09-20 19:23, Skalnate Pleso]

(6034) 1987 JA (Finished) [Add new note]
· This new target was observed by Russ Durkee from Shed of Science South and by Don Pray from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06034.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-16 08:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this one again tonight.

Russ [2022-02-09 02:14, Shed of Science] Message sent to observers

· Trying this one again tonight.

Russ [2022-02-08 03:05, Shed of Science]

· Started on this one tonight.

Russ [2022-02-05 03:22, Shed of Science]

· I started this at 23:40, Jan31 UT.
Don [2022-02-01 00:03, Sugarloaf] Message sent to observers

· I will be starting this one about 1:30 UT

Russ [2022-01-30 01:25, Shed of Science]

· Started a run on this tonight at about 1UT

Russ [2022-01-29 04:19, Shed of Science] Message sent to observers

· I did a run on this on Jan 27 UT.
Don [2022-01-28 01:36, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Did a run on this last night and starting one tonight.

Russ [2022-01-14 04:02, Shed of Science]

(4541) Mizuno (Finished) - binary [Add new note]
· Done for the 2nd apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-16 08:51, Ondrejov]

· Don Pray has taken more data for this return binary from Sugarloaf Mountain. Current solution (the primary event is evolving):
http://www.asu.cas.cz/~asteroid/04541_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04541_2022a_p1.png

More data (errors <= 0.015 mag; don't bother in less optimal conditions) would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-20 16.23 0.253
2022- 2-21 21.91 0.253
2022- 2-23 3.59 0.253
2022- 2-24 9.27 0.253
2022- 2-25 14.95 0.253
2022- 2-26 20.63 0.253
2022- 2-28 2.31 0.253
2022- 3- 1 7.99 0.253
2022- 3- 2 13.67 0.253
2022- 3- 3 19.35 0.253
2022- 3- 5 1.03 0.253
2022- 3- 6 6.71 0.253
2022- 3- 7 12.39 0.253
2022- 3- 8 18.07 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-20 1.29 0.750
2022- 2-21 6.97 0.750
2022- 2-22 12.65 0.750
2022- 2-23 18.33 0.750
2022- 2-25 0.01 0.750
2022- 2-26 5.69 0.750
2022- 2-27 11.37 0.750
2022- 2-28 17.05 0.750
2022- 3- 1 22.73 0.750
2022- 3- 3 4.41 0.750
2022- 3- 4 10.09 0.750
2022- 3- 5 15.77 0.750
2022- 3- 6 21.45 0.750
2022- 3- 8 3.13 0.750

Clear Skies, Petr [2022-02-10 09:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one tonight.
Don [2022-02-09 00:09, Sugarloaf] Message sent to observers

· Doing a run on this tonight and hope to capture the 0.750 phase event.
Don [2022-01-31 01:14, Sugarloaf]

· Don Pray has taken first data for this return binary in its current 2nd apparition:
http://www.asu.cas.cz/~asteroid/04541_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04541_2022a_p1.png

More data (errors <= 0.015 mag; don't bother in less optimal conditions) would be good; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 1-28 4.23 0.250
2022- 1-29 9.91 0.250
2022- 1-30 15.59 0.250
2022- 1-31 21.27 0.250
2022- 2- 2 2.95 0.250
2022- 2- 3 8.63 0.250
2022- 2- 4 14.31 0.250
2022- 2- 5 19.99 0.250
2022- 2- 7 1.67 0.250
2022- 2- 8 7.35 0.250
2022- 2- 9 13.03 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 1-27 13.37 0.750
2022- 1-28 19.05 0.750
2022- 1-30 0.73 0.750
2022- 1-31 6.41 0.750
2022- 2- 1 12.09 0.750
2022- 2- 2 17.77 0.750
2022- 2- 3 23.45 0.750
2022- 2- 5 5.13 0.750
2022- 2- 6 10.81 0.750
2022- 2- 7 16.49 0.750
2022- 2- 8 22.17 0.750

Clear Skies, Petr [2022-01-27 10:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a session on this tonight, Jan. 12, UT
Don [2022-01-12 01:00, Sugarloaf]

· I did a short run on this return binary before clouds came in.
Don [2022-01-09 14:31, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Our discovery announcement on this binary has appeared on CBET 4097, attached below for your convenience.

Cheers, Petr

(4541) MIZUNO
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, K. Hornoch, P. Kusnirak, J. Vrastil and H. Kucakova, Ondrejov
Observatory; Yu. N. Krugly and V. Shevchenko, Kharkiv Observatory; R.
Inasaridze and V. Ayvazian, Abastumani Observatory; J. Oey, Blue Mountains
Observatory, Leura, NSW; W. Cooney and J. Gross, Sonoita Research Observatory,
Sonoita, AZ, USA; D. Terrell, Southwest Research Institute; and I. Molotov,
Keldysh Institute of Applied Mathematics, Moscow; report that photometric
observations obtained during Feb. 24-Apr. 25 reveal that minor planet (4541)
is a binary system with an orbital period of 29.68 ± 0.01 hr. The primary
shows a period of 2.82784 ± 0.00005 hr, and it has a lightcurve amplitude of
0.08 mag at solar phases 3-15 deg, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.06- to 0.15-magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.24. The mean absolute R magnitude of the system is H_R = 12.50 ± 0.04
and the slope parameter G = 0.11 ± 0.04.
V. Reddy and D. Takir, Planetary Science Institute, Tucson, report that
near-infrared spectroscopic observations (0.7-2.5 microns) of minor planet
(4541), obtained on Apr. 26 using the NASA Infrared Telescope Facility on
Mauna Kea, show that it is an S-type minor planet with surface composition
dominated by the minerals olivine and pyroxene.

2015 May 10 (CBET 4097) Daniel W. E. Green [2015-05-11 04:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Last night it was observed from 17:24 up to 21:26 UT.
Yura, Vasil_Sh [2015-04-13 08:47, Kharkiv] Message sent to observers

· Started this at 00:40 UT and should catch the 0.245 phase event.
Don [2015-04-12 00:40, Sugarloaf]

· Observing this one from 18:55 UT to cover 0.245-phase event. Best wishes, Kamil and Hana [2015-04-10 22:58, Ondrejov] Message sent to observers

· Dome shutter working again. Will work from SRO tonight and hopefully tomorrow night to get good coverage of secondary event. [2015-04-09 01:42, Sonoita]

· More data taken by Kamil Hornoch, Jan Vrastil and Hana Kucakova from here and by Don Pray from Sugarloaf Mountain have nailed down P_orb,
http://www.asu.cas.cz/~asteroid/04541_porb.png
http://www.asu.cas.cz/~asteroid/04541_p1.png

We still miss a good complete coverage of the secondary event, which should nail down D_2/D_1, for publishing this one on CBET. Good quality data (errors not greater than 0.02 mag) after the Full Moon are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 4- 8 9.28 0.245
2015- 4- 9 14.96 0.245
2015- 4-10 20.64 0.245
2015- 4-12 2.32 0.245
2015- 4-13 8.00 0.245
2015- 4-14 13.68 0.245
2015- 4-15 19.36 0.245
2015- 4-17 1.04 0.245
2015- 4-18 6.72 0.245
2015- 4-19 12.40 0.245
2015- 4-20 18.08 0.245
2015- 4-21 23.76 0.245
2015- 4-23 5.44 0.245
2015- 4-24 11.12 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2015- 4- 7 18.49 0.747
2015- 4- 9 0.17 0.747
2015- 4-10 5.85 0.747
2015- 4-11 11.53 0.747
2015- 4-12 17.21 0.747
2015- 4-13 22.89 0.747
2015- 4-15 4.57 0.747
2015- 4-16 10.25 0.747
2015- 4-17 15.93 0.747
2015- 4-18 21.61 0.747
2015- 4-20 3.29 0.747
2015- 4-21 8.97 0.747
2015- 4-22 14.65 0.747
2015- 4-23 20.33 0.747
2015- 4-25 2.01 0.747

Clear Skies, Petr [2015-03-29 07:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one at 00:20 UT and hope to catch the secondary event in full.
Don [2015-03-25 00:25, Sugarloaf] Message sent to observers

· The primary event covered last night from Ondrejov, best wishes, Kamil and Honza [2015-03-21 08:47, Ondrejov]

· I started this at 00:20 UT and hope to catch the secondary phase event (if clouds hold off).

Don [2015-03-20 00:23, Sugarloaf] Message sent to observers

· I started a run at 00:20 UT and should catch the last third of the secondary event, as well as the curve out of event.
Don [2015-03-19 00:28, Sugarloaf]

· Running at Prompt Tololo since 0000 UT. Covered secondary centered at 0113 UT. Hope to get outside event light curve as well. Joe [2015-03-14 03:06, Dark Sky & PROMPT] Message sent to observers

· I started a run at 00:00 UT and should catch the 0.244 phase event.
Don [2015-03-12 00:00, Sugarloaf]

· Kamil Hornoch and Jan Vrastil observed this binary from here on the past night, their data resolved the ambiguity in orbital period, it is P_orb = 29.7 h.
http://www.asu.cas.cz/~asteroid/04541_porb.png
http://www.asu.cas.cz/~asteroid/04541_p1.png

One more coverage of each of the two events would be good before we publish on CBET; observations of the primary event would nail down the orbital period to a good level, and observations of the secondary event would provide a good value for the size ratio. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3- 9 17.10 0.244
2015- 3-10 22.80 0.244
2015- 3-12 4.50 0.244
2015- 3-13 10.20 0.244
2015- 3-14 15.90 0.244
2015- 3-15 21.60 0.244
2015- 3-17 3.30 0.244
2015- 3-18 9.00 0.244
2015- 3-19 14.70 0.244
2015- 3-20 20.40 0.244
2015- 3-22 2.10 0.244
2015- 3-23 7.80 0.244
2015- 3-24 13.50 0.244
2015- 3-25 19.20 0.244
2015- 3-27 0.90 0.244
2015- 3-28 6.60 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-10 8.11 0.750
2015- 3-11 13.81 0.750
2015- 3-12 19.51 0.750
2015- 3-14 1.21 0.750
2015- 3-15 6.91 0.750
2015- 3-16 12.61 0.750
2015- 3-17 18.31 0.750
2015- 3-19 0.01 0.750
2015- 3-20 5.71 0.750
2015- 3-21 11.41 0.750
2015- 3-22 17.11 0.750
2015- 3-23 22.81 0.750
2015- 3-25 4.51 0.750
2015- 3-26 10.21 0.750
2015- 3-27 15.91 0.750
2015- 3-28 21.61 0.750

Clear Skies, Petr [2015-03-09 14:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Julian Oey has sent his run of 2015-02-26.6; he captured another event! The orbital period is 29.7 h, or twice or four-times that; a solution for the first:
http://www.asu.cas.cz/~asteroid/04541_porb.png
http://www.asu.cas.cz/~asteroid/04541_p1.png

The event ephemeris below is for the 29.7-h orbital period. For the longer ones, some of the predicted events will not occur. Your observations around the predicted times will therefore nail down the solution.

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3- 9 17.10 0.244
2015- 3-10 22.80 0.244
2015- 3-12 4.50 0.244
2015- 3-13 10.20 0.244
2015- 3-14 15.90 0.244
2015- 3-15 21.60 0.244
2015- 3-17 3.30 0.244
2015- 3-18 9.00 0.244
2015- 3-19 14.70 0.244
2015- 3-20 20.40 0.244
2015- 3-22 2.10 0.244
2015- 3-23 7.80 0.244
2015- 3-24 13.50 0.244
2015- 3-25 19.20 0.244
2015- 3-27 0.90 0.244
2015- 3-28 6.60 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3- 9 2.41 0.750
2015- 3-10 8.11 0.750
2015- 3-11 13.81 0.750
2015- 3-12 19.51 0.750
2015- 3-14 1.21 0.750
2015- 3-15 6.91 0.750
2015- 3-16 12.61 0.750
2015- 3-17 18.31 0.750
2015- 3-19 0.01 0.750
2015- 3-20 5.71 0.750
2015- 3-21 11.41 0.750
2015- 3-22 17.11 0.750
2015- 3-23 22.81 0.750
2015- 3-25 4.51 0.750
2015- 3-26 10.21 0.750
2015- 3-27 15.91 0.750
2015- 3-28 21.61 0.750

Clear Skies, Petr [2015-03-03 10:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· New observations by Don Pray from Sugarloaf Mountain and by Hana Kucakova from here: another event captured. There are several possible values for the orbital period, one of them:
http://www.asu.cas.cz/~asteroid/04541_porb.png
http://www.asu.cas.cz/~asteroid/04541_p1.png

More data are needed to nail down. I encourage all here to help out after the Full Moon.

Clear Skies, Petr [2015-03-03 08:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 23:45, Feb 28 UT.
Don [2015-03-01 01:10, Sugarloaf] Message sent to observers

· Started this at 01:00 UT.
Don [2015-02-28 00:59, Sugarloaf]

· I started this at 01:00 UT. Sky will be clear for a few hours.
Don [2015-02-26 02:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Another new target started by Don Pray, another binary suspect:
http://www.asu.cas.cz/~asteroid/04541_p1.png
http://www.asu.cas.cz/~asteroid/04541_p2.png

Confirmation is needed. Don may not have favorable weather for a few days, so I encourage others here to help out.

Clear Skies, Petr [2015-02-25 08:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target at 01:15 UT.
Don [2015-02-24 03:07, Sugarloaf]

(1141) Bohmia (Finished) - prime suspect [Add new note]
· Vladimir Benishek observed this "prime suspect" from Sopot: Good solution and coverage, no significant deviation.
https://www.asu.cas.cz/~asteroid/01141_c1.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-16 08:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed by Don Pray from Sugarloaf Mountain and Vladimir Benishek from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01141.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-09 08:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· I began a run on this at 00:40 UT.
Don [2019-01-06 00:54, Sugarloaf]

· Started this new target on Jan 2.
Don [2019-01-03 15:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1717) Arlon (Finished) - return 3-period object [Add new note]
· Insufficient coverage of the orbital period in this apparition, unfortunately. Target closed for this apparition. Petr [2022-09-14 13:45, Ondrejov]

· I started a run on this at 23:00 UT, Nov 27.
Don [2021-11-27 23:10, Sugarloaf] Message sent to observers

· I started this on Nov 4 and also observed it on Nov 5.
Don [2021-11-08 02:49, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Further data didn't confirm the one suspect decrease (which is thought to be an artifact from moonlight). No events captured in this apparition:
http://www.asu.cas.cz/~asteroid/01717_2016a_p1.png
http://www.asu.cas.cz/~asteroid/01717_2016a_p2.png
http://www.asu.cas.cz/~asteroid/01717_2016a_porb.png

Closed for this apparition.

Petr [2016-04-14 08:27, Ondrejov]

· I started a session on this at 1:00 and hope to catch the first half of the 0.75 phase event at 5.9 UT.
Don [2016-04-06 01:11, Sugarloaf] Message sent to observers

· Session started at 19:22 UT. [2016-03-30 23:32, IAO-Isaac Aznar Obs.] Message sent to BinAstPhotSurvey conference

· Session started at 19:10 UT. [2016-03-29 20:26, IAO-Isaac Aznar Obs.]

· This return binary has been observed by Don Pray from Sugarloaf Mountain, by Amadeo Aznar, and by Joe Pollock with the Perth telescope. The two rotational lightcurve components are reasonably described in most parts (just a part of the 18.2-h component would need a better coverage), and one attenuation has been captured:
http://www.asu.cas.cz/~asteroid/01717_2016a_p1.png
http://www.asu.cas.cz/~asteroid/01717_2016a_p2.png
http://www.asu.cas.cz/~asteroid/01717_2016a_porb.png

More data (errors <= 0.02 mag) are needed especially around following predicted event times (but don't limit your observations too narrowly around the precited times):

Date/Time UTC (LTc.) Phase
--------------------------
2016- 3-29 21.4 0.249
2016- 4- 3 19.0 0.249
2016- 4- 8 16.6 0.249
2016- 4-13 14.2 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2016- 4- 1 8.3 0.750
2016- 4- 6 5.9 0.750
2016- 4-11 3.5 0.750

Clear Skies, Petr [2016-03-28 11:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Session started at 21:00 UT [2016-03-27 21:20, IAO-Isaac Aznar Obs.] Message sent to observers

· I plan to start this at 01:50 UT.
Don [2016-03-12 00:37, Sugarloaf]

· Planning to start this at 03:00 UT.
Don [2016-03-01 00:45, Sugarloaf]

· I plan to start this at 03:40 UT.
Don [2016-02-19 01:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Extensive observations were taken for this 3-period case from Via Capote, SRO, Modra, Skalnate Pleso and Ondrejov during 2011-09-29 to 11-29. The two rotational lightcurve components were resolved well, but no mutual events were seen:
http://www.asu.cas.cz/~asteroid/01717_110929_1023_p1.png
http://www.asu.cas.cz/~asteroid/01717_110929_1023_p2.png
http://www.asu.cas.cz/~asteroid/01717_111027_1103_p1.png
http://www.asu.cas.cz/~asteroid/01717_111027_1103_p2.png
http://www.asu.cas.cz/~asteroid/01717_111115_29_p1.png
http://www.asu.cas.cz/~asteroid/01717_111115_29_p2.png

Though a coverage of the 117-hr orbit period that we estimated in 2006 is incomplete, actually relevant for the negative event observation is a coverage of P_orb/2 which is almost complete, see
http://www.asu.cas.cz/~asteroid/01717_11_porb.png
http://www.asu.cas.cz/~asteroid/01717_11_halfporb.png
With a small uncertainty due to the missing 3 hours in the half-period coverage, we can conclude that the system was not in events geometry in this apparition.

Good work on this demanding target.

Cheers, Petr [2011-12-07 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing from 16:10 UT. Gabo [2011-11-29 16:14, SkalnatePleso] [Remove]
Message sent to observers

· Observed this evening. Gabo [2011-11-27 16:43, SkalnatePleso] [Remove]

· Planning to work on this tonight. Conditions good. Michal [2011-11-21 15:10, SkalnatePleso] [Remove]
Message sent to observers

· Planning to work on this tonight - after Cirrus cloud coverage permits the observation. Michal [2011-11-19 18:50, SkalnatePleso] [Remove]

· Extensive observations were taken for this one from Via Capote, SRO, Modra, Skalnate Pleso and Ondrejov during 2011-09-29 to 11-01. The two rotational lightcurve components have been resolved well. They have not observed prominent mutual events:
http://www.asu.cas.cz/~asteroid/01717_110929_1023_p1.png
http://www.asu.cas.cz/~asteroid/01717_110929_1023_p2.png
http://www.asu.cas.cz/~asteroid/01717_111027_1101_p1.png
http://www.asu.cas.cz/~asteroid/01717_111027_1101_p2.png

A coverage of the 117-hr orbit period that we estimated in 2006 is not complete yet:
http://www.asu.cas.cz/~asteroid/01717_11_porb.png
If we assume a symmetry with P_orb/2, then a relevant coverage is with a half of the P_orb. This has been almost completed already, with an exception of a single 6-hour long gap, see
http://www.asu.cas.cz/~asteroid/01717_11_halfporb.png
Though a probability that an event fell just into the gap is not high, we should eliminate this uncertainty by completing the coverage; observations for +/-3 hours around following times are needed:

Date/Time UTC (LTc.) Phase
--------------------------
2011-11-14 13.43 0.099
2011-11-16 23.93 0.099
2011-11-19 10.43 0.099
2011-11-21 20.93 0.099
2011-11-24 7.43 0.099
2011-11-26 17.93 0.099
2011-11-29 4.43 0.099
2011-12- 1 14.93 0.099

Clear Skies, Petr [2011-11-08 09:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· One more session in 1/2 No. 2011. Leos [2011-11-05 06:38, Modra] Message sent to observers

· Working from SRO again tonight. -Walt [2011-11-02 02:29, Sonoita]

· observed from 02:26 to 09:18 UT under good conditions. No event observed. [2011-11-01 12:01, Via Capote] Message sent to observers

· Observed under good conditions 31/1 starting at 17:00 - 23:30 UT. Leos [2011-11-01 11:54, Modra]

· observed under fair conditions with only fair seeing conditions beginning at 02:26 and ending at 09:27 UT [2011-10-30 13:16, Via Capote] Message sent to observers

· observed under good conditions starting at 02:48 through 07:48UT [2011-10-29 13:15, Via Capote]

· Started at 0200 UT tonight under very good conditions. [2011-10-28 03:14, Sonoita] Message sent to observers

· observed from 03:15 to 10:15UT under good conditions [2011-10-23 12:58, Via Capote]

· observed from 03:25UT thru 10:20UT under good conditions with a period of passing high thin cloud [2011-10-22 12:46, Via Capote] Message sent to observers

· Observing from ~17:40 UT. Jozef, Stefan. [2011-10-21 17:49, Modra]

· Planning to work on this tonight. Michal [2011-10-17 16:16, SkalnatePleso] [Remove]
Message sent to observers

· observed under excellent conditions starting at 3:35UT [2011-10-17 12:44, Via Capote]

· Planning to work on this - if the weather permits. Michal [2011-10-09 14:43, SkalnatePleso] [Remove]
Message sent to observers

· starting at 03:10UT under excellent conditions [2011-10-09 03:08, Via Capote]

· observed from 03:15UT till 11:15UT under excellent conditions [2011-10-08 12:24, Via Capote] Message sent to observers

· Observing from ~19 UT, but expecting a shorter session. Stefan, Jozef. [2011-10-06 20:45, Modra]

· Observing from ~19:30 UT in variable conditions. Jozef. [2011-10-05 22:36, Modra]

· Observing from 19:10 UTC through cirrus clouds. Leos, Jozef. [2011-10-04 19:14, Modra]

· started observing at 0:330UT under good conditions. This object has a very unusual lightcurve [2011-10-03 12:37, Via Capote] Message sent to observers

· starting at 03:30 UT under good conditions [2011-10-02 03:52, Via Capote]

· starting at 0400 UT under good conditions [2011-09-30 03:59, Via Capote]

· Re-starting this one at 00:00 UT under cirrus clouds. Best wishes, Kamil [2011-09-29 00:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· This long-Porb binary has been done extensively in the 2nd apparition. Though the 117-h orbital period has not been covered completely, a probability that we missed all events is not high, and we close the target for this apparition. We will need a third appairition to further advance with understanding of the system.

Very good work, Jim, Peter, and Kamil.

Cheers, Petr [2008-12-12 12:45, Ondrejov] Message sent to observers

· Observing this one from 23:15 UT. Best wishes, Kamil [2008-12-08 23:18, Ondrejov]

· began observations at 3:30UT under good conditions [2008-12-06 13:34, Via Capote] Message sent to observers

· observed target for approximately 6.5 hours under good conditions [2008-12-05 13:29, Via Capote]

· began observations at 3:30UT [2008-12-05 03:36, Via Capote] Message sent to observers

· This asteroid was observed on 15 nights (from Oct. 26 to Dec 2) from Via Capote (9 nights), Ondrejov (4 nights) and Modra (2 nights). We have covered about 60% of its P_orb (117 h) but not detected any event yet. More observations are still needed. Here are pictures of Arlon's current coverage for your info:

http://www.asu.cas.cz/~asteroid/01717_all.png
http://www.asu.cas.cz/~asteroid/01717_p1.png
http://www.asu.cas.cz/~asteroid/01717_p2.png
http://www.asu.cas.cz/~asteroid/01717_porb.png

Peter K. [2008-12-02 15:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· possible event at beginning of session [2008-12-02 13:49, Via Capote] Message sent to observers

· began observations at 03:00UT under very good conditions [2008-12-02 04:18, Via Capote]

· observed from 3:30 UT under fair conditions... possible event detected.... local conditions (dewing/fog) NO EVENT [2008-11-29 14:03, Via Capote] Message sent to observers

· observed from 3:47 UT in good conditions session shortened due to mechanical issue [2008-11-23 15:05, Via Capote]

· observed from 3:17UT in deteriorating conditions high thin clouds [2008-11-22 01:20, Via Capote] Message sent to observers

· Observed from 3:26 UT in excellent conditions [2008-11-20 12:42, Via Capote]

· observed from 4:44 UT in excellent conditions [2008-11-19 12:38, Via Capote] Message sent to observers

· Observed from 04 UT in good conditions [2008-11-18 13:18, Via Capote]

· Observing this one from 19:34 UT. Best wishes, Kamil [2008-11-03 19:35, Ondrejov]

· Observing from 19:10 UT in similar conditions as yesterday (passing high clouds). Peter K. [2008-11-01 20:48, Ondrejov] Message sent to observers

· Observing from 21 UT in changing conditions (high clouds passing). Peter K. [2008-11-01 02:32, Ondrejov]

· observed for 7 hours last night [2008-10-27 12:24, Via Capote] Message sent to observers

· Observed for 7 hours last night [2008-10-26 12:48, Via Capote]

· Observed for 4 hours last night (after 3576). Peter K. [2008-10-26 09:50, Ondrejov] Message sent to BinAstPhotSurvey conference

(3076) Garber (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5170, copied below for your convenience.

Cheers, Petr

(3076) GARBER
V. Benishek, Belgrade Astronomical Observatory; and P. Pravec, Ondrejov
Observatory, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia during July 13-Aug. 7 reveal that
minor planet (3076) is a binary system with an orbital period of 22.15 Â±
0.01 hr. The primary shows a period of 2.75839 Â± 0.00009 hr and has a
lightcurve amplitude of 0.17 magnitude at solar phases 8-13 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.05 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.22.

2021 September 8 (CBET 5170) Daniel W. E. Green [2022-09-08 06:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two more sessions by Vladimir Benishek from Sopot joined in:
https://www.asu.cas.cz/~asteroid/03076_2022a_porb.png
https://www.asu.cas.cz/~asteroid/03076_2022a_p1.png

More data (errors <= 0.015 mag) are needed to improve the solution, before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8-15 15.53 0.254
2022- 8-16 13.67 0.254
2022- 8-17 11.81 0.254
2022- 8-18 9.95 0.254
2022- 8-19 8.09 0.254
2022- 8-20 6.23 0.254
2022- 8-21 4.37 0.254
2022- 8-22 2.51 0.254
2022- 8-23 0.65 0.254
2022- 8-23 22.79 0.254
2022- 8-24 20.93 0.254
2022- 8-25 19.07 0.254
2022- 8-26 17.21 0.254
2022- 8-27 15.35 0.254
2022- 8-28 13.49 0.254
2022- 8-29 11.63 0.254
2022- 8-30 9.77 0.254
2022- 8-31 7.91 0.254
2022- 9- 1 6.05 0.254
2022- 9- 2 4.19 0.254
2022- 9- 3 2.33 0.254
2022- 9- 4 0.47 0.254
2022- 9- 4 22.61 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8-15 4.40 0.752
2022- 8-16 2.54 0.752
2022- 8-17 0.68 0.752
2022- 8-17 22.82 0.752
2022- 8-18 20.96 0.752
2022- 8-19 19.10 0.752
2022- 8-20 17.24 0.752
2022- 8-21 15.38 0.752
2022- 8-22 13.52 0.752
2022- 8-23 11.66 0.752
2022- 8-24 9.80 0.752
2022- 8-25 7.94 0.752
2022- 8-26 6.08 0.752
2022- 8-27 4.22 0.752
2022- 8-28 2.36 0.752
2022- 8-29 0.50 0.752
2022- 8-29 22.64 0.752
2022- 8-30 20.78 0.752
2022- 8-31 18.92 0.752
2022- 9- 1 17.06 0.752
2022- 9- 2 15.20 0.752
2022- 9- 3 13.34 0.752
2022- 9- 4 11.48 0.752

Clear Skies, Petr [2022-08-08 09:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has taken more data for this one from Sopot. Current solution:
https://www.asu.cas.cz/~asteroid/03076_2022a_porb.png
https://www.asu.cas.cz/~asteroid/03076_2022a_p1.png

The solution is unique, but more data are needed to improve it. Errors <= 0.015 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8- 2 17.44 0.248
2022- 8- 3 15.58 0.248
2022- 8- 4 13.72 0.248
2022- 8- 5 11.86 0.248
2022- 8- 6 10.00 0.248
2022- 8- 7 8.14 0.248
2022- 8- 8 6.28 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2022- 8- 3 4.58 0.752
2022- 8- 4 2.72 0.752
2022- 8- 5 0.86 0.752
2022- 8- 5 23.00 0.752
2022- 8- 6 21.14 0.752
2022- 8- 7 19.28 0.752
2022- 8- 8 17.42 0.752

Clear Skies, Petr [2022-08-02 11:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this binary suspect from Sopot, found binary signs again. A tentative lc decomposition (but it may be wrong):
https://www.asu.cas.cz/~asteroid/03076_2022a_p1.png
https://www.asu.cas.cz/~asteroid/03076_2022a_porb.png

More data (errors <= 0.015 mag) are needed to establish it well.

Clear Skies, Petr [2022-07-22 10:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Interpretation of deviations from the main period in the data by Julian and David is unclear. A tentative fit with a second period (one of many possible):
http://www.asu.cas.cz/~asteroid/03076.png
http://www.asu.cas.cz/~asteroid/03076_p2.png

The second period may be a satellite's rotation, but more and higher quality data are needed to reveal.

Petr [2010-01-09 13:10, Ondrejov]

· observed on 2009-12-11 and 12. Observation condition was good. [2009-12-13 20:58, Blue Mountains Obs] Message sent to observers

· Observed 2009-12-07, 09 and 12 in poor to reasonable conditions. Data reveals a period pf 2.7589 +/- 0.0003hrs with an amplitude of 0.18 +/- 0.02mag [2009-12-13 02:58, HuntersHill]

· Observed 2009-12-05 in fair conditions. Data revealed a period of around 2.72 hrs. [2009-12-06 06:59, HuntersHill] Message sent to observers

· Nice two apparent events in two of your four nights, Julian. The two suspect events have different depths, so either they are primary and secondary, or the event geometry has been evolving.
http://www.asu.cas.cz/~asteroid/03076.png
http://www.asu.cas.cz/~asteroid/03076_091118.png
http://www.asu.cas.cz/~asteroid/03076_091128.png

I encourage other observers to help out Julian to capture more events so that their period can be estimated.

Clear Skies, Petr [2009-11-30 13:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Attempt to observe tonight 11/29 resulted in marginal data. This target is now past opposition and the attenuation observed on 11/28 looks quite real (http://minorplanet.haoeydental.com.au/images/3076_Garber.PNG) . Observation from other timezone will be most useful. Can anyone please help nailing down this possible binary. [2009-11-30 10:19, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 10:45UT 11/28 for 7 hours. Appears to have 0.1m attentuation near the end of session centered at 17UT. [2009-11-29 09:00, Blue Mountains Obs] Message sent to observers

· observed from 10:24UT at 11/27 for 7 hours. Hoping to get more tonight. [2009-11-28 10:05, Blue Mountains Obs]

· Began run from NC on 32" at 0130 UT. Joe [2009-11-28 02:01, Dark Sky & PROMPT] Message sent to observers

· Started at 11/18 and 11/21. preliminary period is 2.47h [2009-11-21 23:17, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(12919) Tomjohnson (Finished) [Add new note]
· Alessandro Marchini and coll. observed this new target from Siena: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/12919.png
Object closed for the Survey.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Petr [2022-09-07 12:53, Ondrejov] Message sent to BinAstPhotSurvey conference

(57754) 2001 VW12 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/57754.png
Object closed for the Survey.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don.

Petr [2022-09-07 12:51, Ondrejov] Message sent to BinAstPhotSurvey conference

(3533) Toyota (Finished) - prime suspect [Add new note]
· Don Pray observed this returned "prime suspect" from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03533_c2.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-09-07 12:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one on July 4.
Don [2022-07-06 00:31, Sugarloaf]

· This return "prime suspect" was done by David from Hunters Hill satisfactorily in this 3rd apparition: Good coverage, no significant deviation. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheer, Petr [2011-05-11 08:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2011-04-09 and 2011-04-14 in reasonable conditions. Data reveals a period of 2.9808 +/- 0.0007h with an amplitude of 0.20 +/- 0.02mag. No deviations detected. [2011-04-14 23:07, HuntersHill] Message sent to BinAstPhotSurvey conference

· This return "prime suspect" has been worked by Julian from Leura (6 nights), by Leos, Jozef and Peter V. from Modra (2), and by David from Hunters Hill (2). Current data are in agreement with the result from the 1st apparition of 2006, they fit well with the single period except one marginal decrease by 0.05 mag on the beginning of 2009-09-28 session that was not confirmed.
http://www.asu.cas.cz/~asteroid/03533_a9.png
Target done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the "prime suspect".

Petr [2009-10-22 10:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009-10-20. Data sent to Peter. [2009-10-20 21:18, HuntersHill] Message sent to observers

· Observed 2009-10-18 from 18:28UT to 21:50UT in cloudy conditions. Leos, Peter Veres [2009-10-20 06:28, Modra]

· Observed 2009-10-19 from 09:25UT to 16:23UT in reasonable conditions. Period of 2.96 +/- 0.02hrs and an amplitude of 0.18 +/- 0.02mag found. [2009-10-19 22:58, HuntersHill] Message sent to observers

· observed from 10:24UT 10/18 for a short run only before fog rolled in. [2009-10-18 21:32, Blue Mountains Obs]

· Observing from ~19:00 UT, in poor conditions. Jozef, Leos. [2009-10-07 20:19, Modra]

· observed from 10:50UT 09/30. [2009-10-01 10:55, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started observing on 09/28 at 10:40UT. [2009-09-29 13:11, Blue Mountains Obs]

(1037) Davidweilla (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01037.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don.

Petr [2022-09-07 12:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a short session on this on Aug 4.
Don [2022-08-07 13:51, Sugarloaf]

(40161) 1998 QO91 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/40161.png
Object closed for the Survey.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-08-03 10:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one tonight.
Don [2022-06-28 01:37, Sugarloaf]

· I observed this on June 25 and 26.
Don [2022-06-27 14:41, Sugarloaf]

(10548) 1992 PJ2 - Prime Suspect [Add new note]
[Send data to: peter@asu.cas.cz ]
· I corrected the number. Petr S. [2022-07-13 08:41, Ondrejov] Message sent to observers

· Typo here. The number should be 10548.
Don [2022-07-09 00:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this one on July 7.
Don [2022-07-09 00:16, Sugarloaf]

· Adrian has reduced the last night from Modra. The target is finished:
http://www.asu.cas.cz/~asteroid/10548.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2007-07-31 08:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been done well by Stefan and Juraj from Modra (5 nights), by Peter K. from Ondrejov (1 night), and by Don from Carbuncle Hill (1 night):
http://www.asu.cas.cz/~asteroid/10548.png
Unique period, good coverage, no significant deviation above the detection limit seen. There is one additional night July 27/28 by Juraj from Modra to be reduced, so we will wait for it before closing the target here. Nevertheless, no more data are needed now.

Nice work, guys.

Cheers, Petr [2007-07-30 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 21:28 UT on July 27, 2007

Juraj [2007-07-27 21:38, Modra]

· Started at 21:28 UT on July 26, 2007.

Stefan/Juraj [2007-07-26 21:34, Modra] Message sent to BinAstPhotSurvey conference

· Started at 21:30 UT on July 25. As a second nice target (10443) entered in the field yesterday, Don could have first data already.

Stefan [2007-07-25 22:32, Modra]

· Doing a run on this tonight.
Don [2007-07-25 03:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 21:46 UT on July 23.

Stefan [2007-07-23 22:50, Modra]

· Doing this tonight.
Don [2007-07-22 03:10, CarbuncleHill]

· Started at 21:54 UT on July 21.

Stefan [2007-07-21 22:28, Modra] Message sent to BinAstPhotSurvey conference

· Started at 22:09 UT on July 20.

Stefan [2007-07-20 22:14, Modra]

· Taking second night for it from here (from 22:15 UT). Peter K. [2007-07-16 22:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:15 UT. Peter K. [2007-07-15 23:54, Ondrejov]

· Don will be away until July 21, so if someone could take over this one in the meantime, it would be good. A period about 4 hours, but not unique:
http://www.asu.cas.cz/~asteroid/10548.png
Two good consecutive nights with errors not greater than 0.03 mag could do it.

Clear Skies, Petr [2007-07-13 17:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one tonight.
Don [2007-07-13 03:13, CarbuncleHill]

· Starting a second run on this at about 3:45 UT. Clouds may interfere.
Don [2007-07-10 03:34, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(6613) Williamcarl (Finished) [Add new note]
· Probably a long-ish period, but the data are insufficient to draw conclusion. Petr [2022-07-12 09:12, Ondrejov]

· I've taken several sessions on this, the last 2 being June 25 and 16.

Don [2022-06-27 19:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this on May 10. Unfortunately, it's in a crowded field. [2022-05-12 20:43, Sugarloaf]

(54419) 2000 LA20 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 6 nights: Unique solution, good coverage, no significant deviations.
https://www.asu.cas.cz/~asteroid/54419.png
Object closed for the Survey.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-06-29 09:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did runs on this on both Apr 30 and May 1.
Don [2022-05-01 23:39, Sugarloaf]

(4272) Entsuji - Return Binary, 2nd apparition [Add new note]
[Send data to: peter@asu.cas.cz ]
· I observed this return binary on June 25 and 26. The field is crowded.
Don [2022-06-27 14:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for the discovery apparition. Petr [2016-01-19 11:47, Ondrejov]

· Monitoring events would be useful for future modeling. Good data (errors < 0.02 mag) covering full events will be useful; don't bother in less optimal conditions. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-12-28 16.43 0.250
2015-12-29 8.37 0.250
2015-12-30 0.32 0.250
2015-12-30 16.26 0.250
2015-12-31 8.21 0.250
2016- 1- 1 0.15 0.250
2016- 1- 1 16.10 0.250
2016- 1- 2 8.04 0.250
2016- 1- 2 23.99 0.250
2016- 1- 3 15.93 0.250
2016- 1- 4 7.88 0.250
2016- 1- 4 23.82 0.250
2016- 1- 5 15.77 0.250
2016- 1- 6 7.71 0.250
2016- 1- 6 23.66 0.250
2016- 1- 7 15.60 0.250
2016- 1- 8 7.55 0.250
2016- 1- 8 23.49 0.250
2016- 1- 9 15.44 0.250
2016- 1-10 7.38 0.250
2016- 1-10 23.33 0.250
2016- 1-11 15.27 0.250
2016- 1-12 7.22 0.250
2016- 1-12 23.16 0.250
2016- 1-13 15.11 0.250
2016- 1-14 7.05 0.250
2016- 1-14 23.00 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2015-12-29 0.45 0.754
2015-12-29 16.40 0.754
2015-12-30 8.34 0.754
2015-12-31 0.29 0.754
2015-12-31 16.23 0.754
2016- 1- 1 8.18 0.754
2016- 1- 2 0.12 0.754
2016- 1- 2 16.07 0.754
2016- 1- 3 8.01 0.754
2016- 1- 3 23.96 0.754
2016- 1- 4 15.90 0.754
2016- 1- 5 7.85 0.754
2016- 1- 5 23.79 0.754
2016- 1- 6 15.74 0.754
2016- 1- 7 7.68 0.754
2016- 1- 7 23.63 0.754
2016- 1- 8 15.57 0.754
2016- 1- 9 7.52 0.754
2016- 1- 9 23.46 0.754
2016- 1-10 15.41 0.754
2016- 1-11 7.35 0.754
2016- 1-11 23.30 0.754
2016- 1-12 15.24 0.754
2016- 1-13 7.19 0.754
2016- 1-13 23.13 0.754
2016- 1-14 15.08 0.754
2016- 1-15 7.02 0.754

Clear Skies, Petr [2015-12-17 07:43, Ondrejov]

· For this one, monitoring events would be useful for future modeling too. Good data (errors < 0.02 mag) covering full events will be useful; don't bother in less optimal conditions. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-11-29 10.85 0.250
2015-11-30 2.79 0.250
2015-11-30 18.74 0.250
2015-12- 1 10.68 0.250
2015-12- 2 2.63 0.250
2015-12- 2 18.57 0.250
2015-12- 3 10.52 0.250
2015-12- 4 2.46 0.250
2015-12- 4 18.41 0.250
2015-12- 5 10.35 0.250
2015-12- 6 2.30 0.250
2015-12- 6 18.24 0.250
2015-12- 7 10.19 0.250
2015-12- 8 2.13 0.250
2015-12- 8 18.08 0.250
2015-12- 9 10.02 0.250
2015-12-10 1.97 0.250
2015-12-10 17.91 0.250
2015-12-11 9.86 0.250
2015-12-12 1.80 0.250
2015-12-12 17.75 0.250
2015-12-13 9.69 0.250
2015-12-14 1.64 0.250
2015-12-14 17.58 0.250
2015-12-15 9.53 0.250
2015-12-16 1.47 0.250
2015-12-16 17.42 0.250
2015-12-17 9.36 0.250
2015-12-18 1.31 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2015-11-29 2.91 0.753
2015-11-29 18.86 0.753
2015-11-30 10.80 0.753
2015-12- 1 2.75 0.753
2015-12- 1 18.69 0.753
2015-12- 2 10.64 0.753
2015-12- 3 2.58 0.753
2015-12- 3 18.53 0.753
2015-12- 4 10.47 0.753
2015-12- 5 2.42 0.753
2015-12- 5 18.36 0.753
2015-12- 6 10.31 0.753
2015-12- 7 2.25 0.753
2015-12- 7 18.20 0.753
2015-12- 8 10.14 0.753
2015-12- 9 2.09 0.753
2015-12- 9 18.03 0.753
2015-12-10 9.98 0.753
2015-12-11 1.92 0.753
2015-12-11 17.87 0.753
2015-12-12 9.81 0.753
2015-12-13 1.76 0.753
2015-12-13 17.70 0.753
2015-12-14 9.65 0.753
2015-12-15 1.59 0.753
2015-12-15 17.54 0.753
2015-12-16 9.48 0.753
2015-12-17 1.43 0.753
2015-12-17 17.37 0.753
2015-12-18 9.32 0.753

Clear Skies, Petr [2015-11-23 08:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our discovery announcement on this one has appeared on CBET 4158, attached below for your convenience.

Cheers, Petr

(4272) ENTSUJI
V. Benishek, Belgrade Astronomical Observatory; J. Pollock, D. Caton,
and R. Hawkins, Appalachian State University; P. Pravec, Ondrejov
Observatory; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA,
U.S.A.; V. Chiorny, Kharkiv Observatory; D. Reichart and J. Haislip,
University of North Carolina, Chapel Hill; and A. Smith, Gemini North,
report that photometric observations obtained during Sept. 14-Oct. 15
reveal that minor planet (4272) is a binary system with an orbital period
of 15.945 Â± 0.006 hr. The primary shows a period of 2.8087 Â± 0.0002 hr
and has a lightcurve amplitude of 0.06 mag at solar phases 4-9 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events
that are 0.03- to 0.08-magnitude deep indicate the secondary-to-primary
mean-diameter ratio of 0.18.

2015 October 30 (CBET 4158) Daniel W. E. Green [2015-10-30 15:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have submitted our discovery announcement on this one to CBET earlier today. Current status:
http://www.asu.cas.cz/~asteroid/04272_porb.png
http://www.asu.cas.cz/~asteroid/04272_p1.png

Monitoring events would be useful for future modeling. Good data (errors < 0.02 mag) covering full events will be useful; don't bother in less optimal conditions. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-30 13.32 0.250
2015-10-31 5.27 0.250
2015-10-31 21.21 0.250
2015-11- 1 13.16 0.250
2015-11- 2 5.10 0.250
2015-11- 2 21.05 0.250
2015-11- 3 12.99 0.250
2015-11- 4 4.94 0.250
2015-11- 4 20.88 0.250
2015-11- 5 12.83 0.250
2015-11- 6 4.77 0.250
2015-11- 6 20.72 0.250
2015-11- 7 12.66 0.250
2015-11- 8 4.61 0.250
2015-11- 8 20.55 0.250
2015-11- 9 12.50 0.250
2015-11-10 4.44 0.250
2015-11-10 20.39 0.250
2015-11-11 12.33 0.250
2015-11-12 4.28 0.250
2015-11-12 20.22 0.250
2015-11-13 12.17 0.250
2015-11-14 4.11 0.250
2015-11-14 20.06 0.250
2015-11-15 12.00 0.250
2015-11-16 3.95 0.250
2015-11-16 19.89 0.250
2015-11-17 11.84 0.250
2015-11-18 3.78 0.250
2015-11-18 19.73 0.250
2015-11-19 11.67 0.250
2015-11-20 3.62 0.250
2015-11-20 19.56 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-30 21.32 0.752
2015-10-31 13.26 0.752
2015-11- 1 5.21 0.752
2015-11- 1 21.15 0.752
2015-11- 2 13.10 0.752
2015-11- 3 5.04 0.752
2015-11- 3 20.99 0.752
2015-11- 4 12.93 0.752
2015-11- 5 4.88 0.752
2015-11- 5 20.82 0.752
2015-11- 6 12.77 0.752
2015-11- 7 4.71 0.752
2015-11- 7 20.66 0.752
2015-11- 8 12.60 0.752
2015-11- 9 4.55 0.752
2015-11- 9 20.49 0.752
2015-11-10 12.44 0.752
2015-11-11 4.38 0.752
2015-11-11 20.33 0.752
2015-11-12 12.27 0.752
2015-11-13 4.22 0.752
2015-11-13 20.16 0.752
2015-11-14 12.11 0.752
2015-11-15 4.05 0.752
2015-11-15 20.00 0.752
2015-11-16 11.94 0.752
2015-11-17 3.89 0.752
2015-11-17 19.83 0.752
2015-11-18 11.78 0.752
2015-11-19 3.72 0.752
2015-11-19 19.67 0.752
2015-11-20 11.61 0.752

Clear Skies, Petr [2015-10-26 10:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run to catch the primary event.
Don [2015-10-15 02:21, Sugarloaf] Message sent to observers

· Started this at 01:40 UT and should catch the primary event.
Don [2015-10-13 01:14, Sugarloaf]

· I plan to start this at 01:40 UT to catch the secondary event at 06.78 UT.
Don [2015-10-11 23:35, Sugarloaf] Message sent to observers

· Currently (1830 UT) running from Perth. Covered secondary event centered at 1450 UT. Joe [2015-10-11 18:31, Dark Sky & PROMPT]

· Starting a run on this at 01:50 UT.
Don [2015-10-10 23:51, Sugarloaf] Message sent to observers

· A binary solution for this new target from the data by Vladimir Benishek from Sopot, by Joe Pollock from Perth and by Don Pray from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/04272_porb.png
http://www.asu.cas.cz/~asteroid/04272_p1.png

More data are needed to nail down; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10- 9 23.00 0.278
2015-10-10 14.94 0.278
2015-10-11 6.88 0.278
2015-10-11 22.82 0.278
2015-10-12 14.76 0.278
2015-10-13 6.70 0.278
2015-10-13 22.64 0.278
2015-10-14 14.58 0.278
2015-10-15 6.52 0.278
2015-10-15 22.46 0.278
2015-10-16 14.40 0.278
2015-10-17 6.34 0.278
2015-10-17 22.28 0.278
2015-10-18 14.22 0.278
2015-10-19 6.16 0.278
2015-10-19 22.10 0.278
2015-10-20 14.04 0.278
2015-10-21 5.98 0.278
2015-10-21 21.92 0.278
2015-10-22 13.86 0.278
2015-10-23 5.80 0.278
2015-10-23 21.74 0.278

Date/Time UTC (LTc.) Phase
--------------------------
2015-10- 9 15.02 0.778
2015-10-10 6.96 0.778
2015-10-10 22.90 0.778
2015-10-11 14.84 0.778
2015-10-12 6.78 0.778
2015-10-12 22.72 0.778
2015-10-13 14.66 0.778
2015-10-14 6.60 0.778
2015-10-14 22.54 0.778
2015-10-15 14.48 0.778
2015-10-16 6.42 0.778
2015-10-16 22.36 0.778
2015-10-17 14.30 0.778
2015-10-18 6.24 0.778
2015-10-18 22.18 0.778
2015-10-19 14.12 0.778
2015-10-20 6.06 0.778
2015-10-20 22.00 0.778
2015-10-21 13.94 0.778
2015-10-22 5.88 0.778
2015-10-22 21.82 0.778
2015-10-23 13.76 0.778
2015-10-24 5.70 0.778

Clear Skies, Petr [2015-10-09 12:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 02:50 UT.
Don [2015-10-08 04:02, Sugarloaf] Message sent to observers

· I observed this one last night (Oct. 05-06, 20:16 - 03:08 UT). There is a larger gap in data due to the overcast.
Vladimir [2015-10-06 14:40, Sopot AO]

· I started this at 2:00 UT.
Don [2015-10-06 02:04, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek and Joe Pollock took first observations for this new target. There is a feature in the data that may be an event in a binary asteroid. A very tentative decomposition of the data (but it may be wrong, and P_orb is actually not determined, of course):
http://www.asu.cas.cz/~asteroid/04272_p1.png
http://www.asu.cas.cz/~asteroid/04272_porb.png

More data are needed to confirm. Vladimir and Joe may not be able to take them soon; you others here are encouraged to help out.

Clear Skies, Petr [2015-10-05 07:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this target on Oct. 03-04, 21:48 - 03:20 UT.
Vladimir [2015-10-04 11:10, Sopot AO]

(10140) Villon (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5130, copied below for your convenience.

Cheers, Petr

(10140) VILLON
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during Mar. 9-Apr. 30 reveal that minor planet (10140) is a
binary system with an orbital period of 28.47 Â± 0.01 hr. The primary shows
a period of 2.50861 Â± 0.00007 hr and has a lightcurve amplitude of 0.12
magnitude at solar phases 1-15 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.10 to 0.20 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.31.

2022 June 8 (CBET 5130) Daniel W. E. Green [2022-06-09 07:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data (errors <= 0.02 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 5-19 17.70 0.242
2022- 5-20 22.17 0.242
2022- 5-22 2.64 0.242
2022- 5-23 7.11 0.242
2022- 5-24 11.58 0.242
2022- 5-25 16.05 0.242
2022- 5-26 20.52 0.242
2022- 5-28 0.99 0.242
2022- 5-29 5.46 0.242
2022- 5-30 9.93 0.242
2022- 5-31 14.40 0.242
2022- 6- 1 18.87 0.242
2022- 6- 2 23.34 0.242
2022- 6- 4 3.81 0.242
2022- 6- 5 8.28 0.242
2022- 6- 6 12.75 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2022- 5-19 3.32 0.737
2022- 5-20 7.79 0.737
2022- 5-21 12.26 0.737
2022- 5-22 16.73 0.737
2022- 5-23 21.20 0.737
2022- 5-25 1.67 0.737
2022- 5-26 6.14 0.737
2022- 5-27 10.61 0.737
2022- 5-28 15.08 0.737
2022- 5-29 19.55 0.737
2022- 5-31 0.02 0.737
2022- 6- 1 4.49 0.737
2022- 6- 2 8.96 0.737
2022- 6- 3 13.43 0.737
2022- 6- 4 17.90 0.737
2022- 6- 5 22.37 0.737

Clear Skies, Petr [2022-05-10 09:14, Ondrejov]

· Starting a run on this tonight.

Russ [2022-04-30 02:31, Shed of Science] Message sent to observers

· Current data for this one:
https://www.asu.cas.cz/~asteroid/10140_2022a_porb.png
https://www.asu.cas.cz/~asteroid/10140_2022a_p1.png

More data (errors <= 0.02 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 4-20 1.95 0.242
2022- 4-21 6.42 0.242
2022- 4-22 10.89 0.242
2022- 4-23 15.36 0.242
2022- 4-24 19.83 0.242
2022- 4-26 0.30 0.242
2022- 4-27 4.77 0.242
2022- 4-28 9.24 0.242
2022- 4-29 13.71 0.242
2022- 4-30 18.18 0.242
2022- 5- 1 22.65 0.242
2022- 5- 3 3.12 0.242
2022- 5- 4 7.59 0.242
2022- 5- 5 12.06 0.242
2022- 5- 6 16.53 0.242
2022- 5- 7 21.00 0.242
2022- 5- 9 1.47 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2022- 4-20 16.04 0.737
2022- 4-21 20.51 0.737
2022- 4-23 0.98 0.737
2022- 4-24 5.45 0.737
2022- 4-25 9.92 0.737
2022- 4-26 14.39 0.737
2022- 4-27 18.86 0.737
2022- 4-28 23.33 0.737
2022- 4-30 3.80 0.737
2022- 5- 1 8.27 0.737
2022- 5- 2 12.74 0.737
2022- 5- 3 17.21 0.737
2022- 5- 4 21.68 0.737
2022- 5- 6 2.15 0.737
2022- 5- 7 6.62 0.737
2022- 5- 8 11.09 0.737
2022- 5- 9 15.56 0.737

Clear Skies, Petr [2022-04-12 08:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot, found it to be a binary. Likely solution:
https://www.asu.cas.cz/~asteroid/10140_2022a_porb.png
https://www.asu.cas.cz/~asteroid/10140_2022a_p1.png

More data (errors <= 0.02 mag) are needed to nail it down. Event ephemeris for the likely solution (but don't limit your observations too closely around the predicted mid-event times, the ephemeris is not very accurate yet):

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-29 17.30 0.244
2022- 3-30 21.73 0.244
2022- 4- 1 2.16 0.244
2022- 4- 2 6.59 0.244
2022- 4- 3 11.02 0.244
2022- 4- 4 15.45 0.244
2022- 4- 5 19.88 0.244
2022- 4- 7 0.31 0.244
2022- 4- 8 4.74 0.244
2022- 4- 9 9.17 0.244
2022- 4-10 13.60 0.244
2022- 4-11 18.03 0.244
2022- 4-12 22.46 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-30 7.55 0.746
2022- 3-31 11.98 0.746
2022- 4- 1 16.41 0.746
2022- 4- 2 20.84 0.746
2022- 4- 4 1.27 0.746
2022- 4- 5 5.70 0.746
2022- 4- 6 10.13 0.746
2022- 4- 7 14.56 0.746
2022- 4- 8 18.99 0.746
2022- 4- 9 23.42 0.746
2022- 4-11 3.85 0.746
2022- 4-12 8.28 0.746

Clear Skies, Petr [2022-03-29 14:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one was observed on several nights from Sopot.

Vladimir [2022-03-24 14:40, Sopot AO]

(20085) 1994 LC - new binary, more data needed [Add new note]
[Send data to: peter@asu.cas.cz ]
· Russ has taken more data for this one, catched more events. I'm traveling now and I will analyze his new data later on. However, as the weather forecast for his site this week is poor, he would appreciate a help by others. (Errors of 0.02 mag are needed.) I encourage people here to help out Russ.

Clear Skies, Petr [2022-05-31 07:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working this object again tonight.

Russ [2022-05-27 02:33, Shed of Science] Message sent to observers

· Working this object tonight.

Russ [2022-05-26 02:27, Shed of Science]

· Will try to follow tonight.

Russ [2022-05-13 02:42, Shed of Science]

· Russ Durkee has observed this new target from Shed of Science South, found it to be a binary suspect. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/20085_2022a_p1.png
https://www.asu.cas.cz/~asteroid/20085_2022a_porb.png
(The P_orb value in the 2nd plot above was set just for plotting purpose, there is no solution for the orbit period yet.)

More data (errors not greater than 0.02 mag) are needed to confirm it.

Clear Skies, Petr [2022-05-11 06:58, Ondrejov] Message sent to BinAstPhotSurvey conference

(3698) Manning (Finished) - prime suspect [Add new note]
· Done in 3rd apparition.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-05-28 09:39, Ondrejov]

· Starting on this one tonight.

Russ [2022-01-03 01:33, Shed of Science] Message sent to observers

· Observed on 11/14, and will on 11/15

Russ [2021-11-15 00:27, Shed of Science] Message sent to BinAstPhotSurvey conference

· Julian Oey observed this return "prime suspect" from Leura: Good solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03698_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-04 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Additional observations completed on 04/13 (short sessions), 04/15 and 04/17 (full night sessions). No deviation noted. [2020-04-18 07:49, Blue Mountains Obs] Message sent to observers

· observed on 04/10 and 04/12 under good condition. no deviation [2020-04-13 03:13, Blue Mountains Obs]

· started this prime suspect 04/05 form 12:47 UT [2020-04-06 10:24, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Joe Pollock did this new target with PROMPT: Unique period, multiple coverage, no deviation,
http://www.asu.cas.cz/~asteroid/03698.png
Target done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice, quick and clean work Joe.

Cheers, Petr [2014-08-18 06:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt Tololo at 0300 UT. Results from last night show both 3698 Manning and 4623 Obraztsova have periods slightly over three hours and amplitudes of about 0.4 magnitudes. Joe [2014-07-26 03:09, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

· Plan to observe this new target from the current list from Prompt Tololo tonight beginning at ~0300 UT. Second object in field tonight and tomorrow night (4623 Obraztsova, Main Belt) with unknown period, magnitude 16.9 and and H=12.6. Joe [2014-07-24 23:47, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(42946)1999 TU95 (Finished) - Paired Asteroid [Add new note]
· Target closed for this apparition. Petr [2022-05-26 08:06, Ondrejov]

· Started a run on this one tonight.

Russ [2022-04-03 03:41, Shed of Science] Message sent to observers

· Starting this paired asteroid.
DOn [2022-03-30 00:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

(20419) 1998 SE117 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 nights: Unique solution, coverage marginally acceptable, no prominent significant deviation.
http://www.asu.cas.cz/~asteroid/20419.png
Object closed for the Survey.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-05-25 07:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this on Jan 26.
Don [2022-01-26 20:30, Sugarloaf]

· Started this one on Jan 22.
Don [2022-01-25 15:24, Sugarloaf]

(1739) Meyermann (Finished) - Prime suspect [Add new note]
· Don Pray observed this returned "prime suspect" from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01739_c1.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-05-25 07:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've done a few sessions on this prime suspect during November.
Don [2021-11-28 21:19, Sugarloaf]

· Don Pray from Sugarloaf Mountain and Marek Husarik and Gabo Cervak from Skalnate Pleso have observed this return "prime suspect" in its 2nd apparition, saw no significant deviation,
http://www.asu.cas.cz/~asteroid/01739_b4.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-09-25 11:05, Ondrejov]

· I started at 22:50UT, I observe although is not ideal weather conditions. Zuzana [2014-09-25 01:50, SkalnatePleso] [Remove]
Message sent to observers

· Started at 00:05 UT. Gabo [2014-09-21 00:05, SkalnatePleso] [Remove]

· Observing from 23:50 UT. Gabo [2014-09-20 00:01, SkalnatePleso] [Remove]
Message sent to observers

· I plan to start on this at 03:00 UT.
Don [2014-09-19 00:37, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Just started at 22:50 UT. Gabo [2014-09-18 22:59, SkalnatePleso] [Remove]
Message sent to observers

· Plan to start this one at 03:05 UT.
Don [2014-09-18 00:26, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1697) Koskenniemi (Finished) - Prime suspect [Add new note]
· Done in the 2nd apparition. Petr [2022-05-24 10:33, Ondrejov]

· Doing a run on this tonight.
Don [2022-01-04 02:11, Sugarloaf] Message sent to observers

· I did a run on this last night and am doing it again tonight, Dec 14.
Don [2021-12-14 02:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this returning prime suspect on Dec 4.
Don [2021-12-05 16:33, Sugarloaf]

· This new target was done by Bob Stephens from Santana Observatory and by Don Pray from Sugarloaf Mountain: U = 2+ solution, multiple coverage, no significant deviation (in data taken in good conditions).
http://www.asu.cas.cz/~asteroid/01697_2017a.png
http://www.asu.cas.cz/~asteroid/01697_2017b.png
Object closed
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-10-02 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 02:30 UT to check on a possible event.
Don [2017-09-24 01:04, Sugarloaf]

· Will start a run on this at 02:50 UT.
DOn [2017-09-17 02:11, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I just completed observing Koskenniemi. With the low amplitude, there are several possible aliases. My preferred result is 2.392 hours. There were no signs of events. [2017-09-03 15:50, Santana] Message sent to observers

· I observed this new target on Sep 1 and 2. It appears to be a fast rotator.
Don [2017-09-03 14:49, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3837) Carr (Finished) - Paired Asteroid [Add new note]
· Target closed in the 2nd apparition. Petr [2022-05-23 11:54, Ondrejov]

· Plan to start this one at 04:00 UT.
Don [2022-02-01 00:05, Sugarloaf] Message sent to observers

· Starting this at 3:50 UT.
Don [2022-01-31 01:15, Sugarloaf]

· I did a run on this on Jan 26.
Don [2022-01-26 20:28, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start this paired asteroid at 05:20 UT. Hopefully, clouds will cooperate.
Don [2022-01-12 01:05, Sugarloaf]

· Target done. Petr [2020-11-21 08:57, Ondrejov]

· I did a run on this on Oct 18, UT.
Don [2020-10-19 01:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

(13959) 1991 EL4 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 nights: Unique solution, good coverage, no significant deviation.
https://www.asu.cas.cz/~asteroid/13959.png
Target closed.
https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2022-05-20 07:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did 2 sessions on this one, April 30 and May 1.
Don [2022-05-01 23:42, Sugarloaf]

(4494) Marimo (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5124, copied below for your convenience.

Cheers, Petr

(4494) MARIMO
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
K. Hornoch, and P. Kusnirak, Ondrejov Observatory; A. Aznar, Isaac Aznar
Observatory, Alcublas, Valencia, Spain; A. Leroy, Association T60, Toulouse,
France; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX, USA,
report that photometric observations taken with a 0.35-m telescope at the
Sopot Observatory in Serbia, a 0.65-m telescope at the Ondrejov Observatory,
a 0.35-m telescope at the Isaac Aznar Observatory, a 0.50-m telescope at Pic
du Midi Observatory, and a 0.50-m telescope at the Shed of Science South
Observatory during Jan. 14-Mar. 27 reveal that minor planet (4494) is a
binary system with an orbital period of 24.73 Â± 0.02 hr. The primary
shows a period of 4.1209 Â± 0.0002 hr and has a lightcurve amplitude of 0.12
magnitude at solar phases 0.4-10.5 degrees, suggesting a nearly spheroidal
shape. Mutual eclipse/occultation events that are 0.15 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.38. The mean absolute R magnitude in the Cousins system is H_R = 13.28
Â± 0.15, assuming the phase-relation slope parameter G = 0.24 Â± 0.11.

2022 May 19 (CBET 5124) Daniel W. E. Green [2022-05-20 07:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/04494_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04494_2022a_p1.png

More data (errors not greater than 0.02 mag) would be good to add before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 10.72 0.248
2022- 3-22 11.45 0.248
2022- 3-23 12.18 0.248
2022- 3-24 12.91 0.248
2022- 3-25 13.64 0.248
2022- 3-26 14.37 0.248
2022- 3-27 15.10 0.248
2022- 3-28 15.83 0.248
2022- 3-29 16.56 0.248
2022- 3-30 17.29 0.248
2022- 3-31 18.02 0.248
2022- 4- 1 18.75 0.248
2022- 4- 2 19.48 0.248
2022- 4- 3 20.21 0.248
2022- 4- 4 20.94 0.248
2022- 4- 5 21.67 0.248
2022- 4- 6 22.40 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 22.95 0.743
2022- 3-22 23.68 0.743
2022- 3-24 0.41 0.743
2022- 3-25 1.14 0.743
2022- 3-26 1.87 0.743
2022- 3-27 2.60 0.743
2022- 3-28 3.33 0.743
2022- 3-29 4.06 0.743
2022- 3-30 4.79 0.743
2022- 3-31 5.52 0.743
2022- 4- 1 6.25 0.743
2022- 4- 2 6.98 0.743
2022- 4- 3 7.71 0.743
2022- 4- 4 8.44 0.743
2022- 4- 5 9.17 0.743
2022- 4- 6 9.90 0.743
2022- 4- 7 10.63 0.743

Clear Skies, Petr [2022-03-11 11:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/04494_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04494_2022a_p1.png

The orbit period is unique now. More data (errors < 0.02 mag) are needed; the events are evolving. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-20 14.33 0.250
2022- 2-21 15.06 0.250
2022- 2-22 15.79 0.250
2022- 2-23 16.52 0.250
2022- 2-24 17.25 0.250
2022- 2-25 17.98 0.250
2022- 2-26 18.71 0.250
2022- 2-27 19.44 0.250
2022- 2-28 20.17 0.250
2022- 3- 1 20.90 0.250
2022- 3- 2 21.63 0.250
2022- 3- 3 22.36 0.250
2022- 3- 4 23.09 0.250
2022- 3- 5 23.82 0.250
2022- 3- 7 0.55 0.250
2022- 3- 8 1.28 0.250
2022- 3- 9 2.01 0.250
2022- 3-10 2.74 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-20 1.86 0.746
2022- 2-21 2.59 0.746
2022- 2-22 3.32 0.746
2022- 2-23 4.05 0.746
2022- 2-24 4.78 0.746
2022- 2-25 5.51 0.746
2022- 2-26 6.24 0.746
2022- 2-27 6.97 0.746
2022- 2-28 7.70 0.746
2022- 3- 1 8.43 0.746
2022- 3- 2 9.16 0.746
2022- 3- 3 9.89 0.746
2022- 3- 4 10.62 0.746
2022- 3- 5 11.35 0.746
2022- 3- 6 12.08 0.746
2022- 3- 7 12.81 0.746
2022- 3- 8 13.54 0.746
2022- 3- 9 14.27 0.746
2022- 3-10 15.00 0.746

Clear Skies, Petr [2022-02-14 13:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data for this one have been taken by Vladimir Benishek and Amadeo Aznar. Though the Amadeo's data are somewhat noisy (any chance to improve them Amadeo, maybe in collaboration with Vladimir?), the combined data provide two possible solutions for P_orb: 24.7 h or twice that. Following solution is for the 24.7-h candidate orbital period:
http://www.asu.cas.cz/~asteroid/04494_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04494_2022a_p1.png

More data (with errors not greater than 0.02 mag) are needed to resolve. Below is event ephemeris for the 24.7-h candidate orbital period. Covering phases around 0.75 will be critically needed for obtaining a unique solution.

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2- 2 1.04 0.250
2022- 2- 3 1.74 0.250
2022- 2- 4 2.44 0.250
2022- 2- 5 3.14 0.250
2022- 2- 6 3.84 0.250
2022- 2- 7 4.54 0.250
2022- 2- 8 5.24 0.250
2022- 2- 9 5.94 0.250
2022- 2-10 6.64 0.250
2022- 2-11 7.34 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2- 1 12.68 0.750
2022- 2- 2 13.38 0.750
2022- 2- 3 14.08 0.750
2022- 2- 4 14.78 0.750
2022- 2- 5 15.48 0.750
2022- 2- 6 16.18 0.750
2022- 2- 7 16.88 0.750
2022- 2- 8 17.58 0.750
2022- 2- 9 18.28 0.750
2022- 2-10 18.98 0.750

Clear Skies, Petr [2022-02-01 09:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. A very tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/04494_2022a_p1.png
http://www.asu.cas.cz/~asteroid/04494_2022a_porb.png
(The period in the 2nd plot was set just for plotting purpose. There is obviously no solution for the orbit period yet.)

More data (errors not greater than 0.02 mag) are needed to confirm.

Clear Skies, Petr [2022-01-26 10:15, Ondrejov] Message sent to BinAstPhotSurvey conference

(3220) Murayama (Finished) - binary suspect, more data needed [Add new note]
· More data obtained didn't confirm the binary suspicion. Campaign closed. Petr [2022-05-18 13:31, Ondrejov]

· Vladimir Benishek has observed this off-list binary suspect from Sopot on 2 nights, caught an apparent attenuation. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/03220_2022a_p1.png
http://www.asu.cas.cz/~asteroid/03220_2022a_porb.png
(The P_orb value was set there just for plotting purpose, there is no real solution for the orbit period yet, of course.)

More high-quality observations (errors < 0.015 mag) are needed to confirm it. A help to Vladimir would be appreciated.

Clear Skies, Petr [2022-01-10 13:43, Ondrejov] Message sent to BinAstPhotSurvey conference

(11116) 1996 EK (Finished) - Suspect Binary [Add new note]
· Deviations detected, but no clear solution. Target closed for the 4th apparition. Petr [2022-05-18 13:14, Ondrejov]

· Doing this one tonight.
Don [2022-03-30 00:45, Sugarloaf] Message sent to observers

· Observed in two nights (March 06 and 11).
- Marek [2022-03-12 12:57, SkalnatePleso] [Remove]

· I started this at 03:20 UT after a late start.
Don [2022-03-11 03:20, Sugarloaf] Message sent to observers

· I have done a few runs on this. Will be covering it tonight.

Russ [2022-03-10 02:08, Shed of Science]

· I did a run on this on Mar 4 and am observing again Mar 5.
Don [2022-03-05 00:13, Sugarloaf] Message sent to observers

· I observed this on Feb. in deteriorating conditions.
Don [2022-02-28 03:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done in the 3rd apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-27 11:51, Ondrejov]

· Observed on May 10-11, 21:25-01:33 UT.
Vladimir [2019-05-11 14:39, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed on May 02-03, 22:04-02:16 UT.
Vladimir [2019-05-03 12:24, Sopot AO]

· Observed on Apr. 26, 00:03-02:13 UT.
Vladimir [2019-04-26 13:03, Sopot AO] Message sent to BinAstPhotSurvey conference

· This serious binary candidate was observed on Apr. 16-17, 22:40-02:52 UT.
Vladimir [2019-04-17 14:12, Sopot AO]

· Extensive observations by Don from Carbuncle (7 nights), by Julian from Leura (5), and by Adrian and Leos from Modra (3 linked nights) didn't establish its binary parameters: a couple attenuations seen on beginning/end of sessions, but inconclusive. So, it remains a serious binary candidate, but establishing it awaits for future. P_1 was well established:
http://www.asu.cas.cz/~asteroid/11116_a9.png
We close it for this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2009-04-07 11:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 4.4.2009 18:33 - 21:07 UT. Leos [2009-04-05 11:12, Modra] Message sent to observers

· Even tonight it is clear sky here. I plan this tonight if there is no other suggestion from elsewhere (and 3913 again in the morning for a while perhaps). Adrian [2009-04-03 17:55, Modra]

· We should be starting this around 2:45 UT.

John G [2009-04-02 02:36, Sonoita] Message sent to observers

· I started a run on this at 00:10 UT.
Don [2009-04-01 01:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 01:00 UT.
Don [2009-03-26 03:41, CarbuncleHill]

· started observation on 2009-03-24 at 10:22UT. [2009-03-25 05:45, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started a run at 00:10 UT.
Don [2009-03-25 01:36, CarbuncleHill]

· observed on 2 nights 2009-03-18 and 2009-03-19 starting at 10 UT. data sent in. [2009-03-20 05:41, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started this one at 01:00 UT.
Don [2009-03-18 01:01, CarbuncleHill]

· observed on 2 nights 2009-03-15 and 2009-03-16 for about 5 hours each starting at 10UT. [2009-03-17 04:06, Blue Mountains Obs] Message sent to observers

· Started a run at 02:10 UT.
Don [2009-03-05 04:21, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Plan to start this at 02:05 UT.
Don [2009-03-04 01:16, CarbuncleHill]

· For this marginal binary detection -just at the limit of the BinAstPhotSurvey- we have established the main period of 4.4017 h well, but Porb has not been well established. I'll have to work on it more (program out a routine here more for the marginal case) before we may publish it formally. Anyway, I'm closing its campaign here now, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-08-09 14:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two new nights by David from Hunters Hill joined in. The main period of 4.4017 h is holding nicely, the whole
July 12.5 session as well as most of the July 13.5 session fit well with it. The first three points of the last night are lower by 0.03 mag (David has checked the points and found no problem), so it seems to be another shallow attenuation like those we have seen in the object in the previous lunation. No period for the shallow attenuations resolved so far, however.
http://www.asu.cas.cz/~asteroid/11116_060712.png
http://www.asu.cas.cz/~asteroid/11116_060713.png

Petr [2006-07-14 15:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 13JUL2006 from 8:59UT to 13:16UT (session cut short by cloud). Data error around 0.03mag

Data sent to Petr and Peter [2006-07-13 13:39, HuntersHill]

· Observed 12JUL2006 from 8:22UT to 15:31UT at 480 sec integrations. Still only managed 0.02 - 0.04mag precision. [2006-07-13 11:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· David, your last two nights of this lunation fit reasonably well considering the conditions (affected by the Moon). There are a couple intervals of marginally deviating points, they appear consistent with the preliminary estimated recurrence period of 51.3 h, but still not a unique solution.
http://www.asu.cas.cz/~asteroid/11116_shortpc.png
http://www.asu.cas.cz/~asteroid/11116_longpc.png

I assume you and Bob Stephens will want to resume observations of this one in the next lunation. Well, considering that the deviations seen there are marginal, that it fades by 0.1 mag per three days, and that it is moving south (so more nothern sessions cannot help effectively with long sessions), I am not sure if your more effort will bring a satisfactory solution eventually. It is up to you (and Bob) to decide how much more effort you will want to invest into this marginal case. For the BinAstPhotSurvey, it will be OK either way, since this one is right at the detection limit of the Survey.

Cheers, Petr [2006-07-07 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Full session observed from 8:22UT to 15:26UT. Images were Moon affected (last session for this lunation) but right on the 0.03 mag limit.
Data sent to Petr and Peter. [2006-07-07 01:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 08:18UT to 15:53UT. Reasonably good data considering the conditions.
Data sent to Petr and Peter. [2006-07-05 23:06, HuntersHill]

· The last night's session by David is fitting with both periods; a shallow (0.04-mag deep) attenuation marginally detected there at the beginning of the session, see
http://www.asu.cas.cz/~asteroid/11116_longpc.png
More data are needed to get a good solution.

Cheers, Petr [2006-07-05 09:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 08:24UT to 15:58UT in reasonable conditions but 1st Quarter moon. Data was better than 0.03 and sent to Petr/Peter. [2006-07-04 22:49, HuntersHill]

· A main period of 4.4015 h has been derived reasonably well from data by David Higgins (Hunters Hill) and Bob Stephens (GMARS) for this target and most data fit with it nicely, see
http://www.asu.cas.cz/~asteroid/11116_shortpc.png
On the three nights by Bob, however, there occured deviations.
On the first two nights of 2006-06-17.3 and 18.3, the attenuations were shallow, 0.03 and 0.04 mag, respectively, so below and just at the nominal limit for the Survey. Nonetheless, both David and Bob gave more effort in order to confirm those marginal attenutions. At last, the latest night of 2006-07-01.3 by Bob has shown a more prominent attenuation with a depth about 0.10 mag. A search for period didn't give a unique solution yet, one of possible periods see
http://www.asu.cas.cz/~asteroid/11116_longpc.png
If it was correct orbital period, then the apparent deepening of the event from June 18 to July 1 would indicate that we have just entered a season of mutual events in the system. But the solution is not unique yet. With the relatively long period (i.e., not so close system) and at the solar phase near 20 deg, we may even see eclipses and occultations (if both occur there now) somewhat displaced. A good coverage is needed.

So, I encourage all who can observe this one with errors <=0.03 mag to work it (long sessions preferred). It is a tough target, but if we have really entered a season of mutual events as the Bob's data suggest, we could be able to describe it well eventually.

Cheers, Petr [2006-07-04 09:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Full session observed from 0803UT to 16:23UT. No obvious deviations seen, good data. Main period of 4.4017 +/- 0.0004 still holds.

Data sent to Petr and Peter. [2006-06-30 01:49, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full session observed from 08:06UT to 16:16UT. No obvious deviations seen but good data. Main period of 4.4017 +/- 0.0004 still evident.

Data sent to Petr and Peter. [2006-06-28 23:04, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full session 07:59UT to 16:27UT no obvious change from previous. Period refined to 4.4017 +/- 0.0005hrs is now stronger than the 1/2 period solution (based only on my data)
Data sent to Petr and Peter. [2006-06-26 22:37, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full session on 24 Jun of good data fits existing curve. Nothing new to report. Data sent to Petr and Peter. [2006-06-25 22:36, HuntersHill]

· I have scheduled observations for the weekend (June 24 & 25) and will take longer exposures to improve the SNR. [2006-06-21 17:15, Santana] Message sent to BinAstPhotSurvey conference

· Well, no unique solution for a second period in this one. (Peter, your suggested period of 14.94 h is only one of a number of possible periods, if magnitude zero points of the relative sessions are varied.) The ambiguity in the main period (2.201 or 4.402 h) is not satisfactorily resolved yet. Long accurately linked sessions with errors not greater than 0.01 mag are critically needed for this one. At least, there are no apparent mutual events with depth greater than the nominal limit of the Survey (0.04 mag). So, if we happen to don't get good enough data to resolve the tough case, it will be no problem for the Survey, since this would remain a possible but not certain binary anyway if no mutual events are caught. So, nothing big to worry about possibly not resolving such low amplitude possible binary. The Survey is designed to work efficiently only for binaries with mutual events deeper than 0.04 mag.

Cheers, Petr [2006-06-21 16:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· My analysis of joined data taken by David Higgins and Robert Stephens shows two additive components with periods of 4.402 h and 14.94 h. There is no occultation/ecclipse event observed yet (one attenuation observed by David H. on June 13.5 seems to be not real due to his poor conditions):

http://www.asu.cas.cz/~asteroid/11116_all.png
http://www.asu.cas.cz/~asteroid/11116_longpc.png
http://www.asu.cas.cz/~asteroid/11116_shortpc.png

One or two long sessions with errors <0.02 mag should finish its discovery phase. Nice work, David & Bob.

Peter K. [2006-06-19 14:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Very sorry to hear about your died telescope, David. Re. 11116: periods 2.2009 and 4.403 h are equally likely, see
http://www.asu.cas.cz/~asteroid/11116.png
High accuracy data (errors <0.01 mag) could resolve it. Is here someone able to take such data?

Petr [2006-06-15 09:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Unfortunately I won't be able to complete this target. Hunters Hill is closed until further notice as the Telescope has died. [2006-06-15 08:52, HuntersHill]

· Full session and much better data at Bin 1. Canopus resolves best fit for the binbodal curve at 4.402 +/- 0.001hrs with an amplitude of 0.1 +/- 0.03mag. It's noisey and the moon affected data from the previous 2 sessions still fit though not well only affecting the derived period by 0.001hrs. More quality data is needed this lunation. [2006-06-14 22:27, HuntersHill] Message sent to BinAstPhotSurvey conference

· A full night for a change. Data was lower precision because of the presence of the moon and displayed evidence of lower lows and higher peaks but otherwise fits the existing solutions.

Did also catch 894 Erda in the same field showing a period of 4.69 +/- 0.04hrs and an amplitude of 0.24 +/- 0.01 mag. [2006-06-12 22:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· No obvious sign for binarity so far, but a bit more data are needed to nail down this one. Basicly, periods that are integer multiples of 2.2 h are possible. Two of them, 4.4 h and 8.8 h see in following two pictures
http://www.asu.cas.cz/~asteroid/11116_4h.png
http://www.asu.cas.cz/~asteroid/11116_8h.png
Since shapes of the individual local extrema are different in the different solution, there is a good probability that we will resolve between them with a few more long sessions with errors <0.02 mag. I suggest that David and Julian work it collaboratively (to get a better coverage) after the Full Moon, and that someone from the northern hemisphere can help them to cover it during times when they have a daytime there in Australia.

Cheers, Petr [2006-06-08 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another short night due to cloud and fog. Data seems OK and the plot centres strongly around 4.4 hrs but indicates soem variation. I think this may be a target of interest.

Data has been sent to Petr and Peter. [2006-06-07 22:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Another short night on this target with reasonable data. Data still indicates a period of around 4-5 hours but there appears to be some variation. Given the low amplitude it could just be noise - more data needed. [2006-06-05 22:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed a broken session (due to cloud) in a relatively crowded field revealing a period of 4.7 hrs with an amplitude of around 0.08 mag +/- 0.01 [2006-06-04 22:46, HuntersHill]

(1878) Hughes (Finished) - binary suspect, more data needed [Add new note]
· It remains a binary suspect, but the data obtained didn't provide a clear solution for it. Campaign closed. Petr [2022-05-18 11:20, Ondrejov]

· Rui Goncalves has observed this off-list target, found it to be a binary suspect. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/01878_2022a_p1.png
https://www.asu.cas.cz/~asteroid/01878_2022a_porb.png
(The period value in the 2nd plot above was set just for plotting purpose. There is no estimate for P_orb yet, of course.)

More data (with errors < 0.015 mag) are needed to confirm it. Weather forecast for Rui's station is not good for following nights, so he would appreciate a help by others here.

Clear Skies, Petr [2022-02-23 09:32, Ondrejov] Message sent to BinAstPhotSurvey conference

(4528) Berg (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5123, copied below for your convenience.

Cheers, Petr

(4528) BERG
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; G. Scarfi, Iota Scorpii Observatory, La Spezia, Italy; A.
Coffano, W. Marinello, G. Pizzetti, and A. Soffiantini, Osservatorio Serafino
Zani, Lumezzane, Italy; A. Marchini and R. Papini, Dipartimento di Scienze
Fisiche, Della Terra e Dell'Ambiente, University of Siena; P. Bacci, M.
Maestripieri, R. Bacci, and L. Franco, Astronomical Observatory, San Marcello
Pistoiese, Italy; R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A.; R. Goncalves, Linhaceira, Tomar, Portugal; N. Montigiani and M.
Mannucci, Osservatorio Astronomico Margherita Hack, Firenze, Italy; G. Baj,
M57 Observatory, Saltrio, Italy; and N. Ruocco, Osservatorio Astronomico
Nastro Verde, Sorrento, Italy, report that photometric observations taken with
a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.40-m telescope at
the Iota Scorpii Observatory, a 0.40-m telescope at the Lumezzane Observatory,
a 0.30-m telescope at the Astronomical Observatory of the University of Siena,
a 0.60-m telescope at the San Marcello Pistoiese Observatory, a 0.50-m
telescope at the Shed of Science South Observatory, a 0.35-m telescope at the
Linhaceira Observatory, a 0.25-m telescope at the Osservatorio Astronomico
Margherita Hack, a 0.35-m telescope at the M57 Observatory, and a 0.35-m
telescope at the Osservatorio Astronomico Nastro Verde during Feb. 2-May 7
reveal that minor planet (4528) is a binary system with an orbital period of
35.02 Â± 0.02 hr. The primary shows a period of 3.5627 Â± 0.0001 hr and has
a lightcurve amplitude of 0.23 magnitude at solar phases 1-4 degrees. Mutual
eclipse/occultation events that are 0.06 to 0.12 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.3.

2022 May 14 (CBET 5123) Daniel W. E. Green [2022-05-17 06:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this one to cover the 0.745 event.

Russ [2022-04-29 01:30, Shed of Science] Message sent to observers

· Our current data for this one:
https://www.asu.cas.cz/~asteroid/04528_2022a_porb.png
https://www.asu.cas.cz/~asteroid/04528_2022a_p1.png
https://www.asu.cas.cz/~asteroid/04528_2022b_porb.png
https://www.asu.cas.cz/~asteroid/04528_2022b_p1.png
https://www.asu.cas.cz/~asteroid/04528_2022c_porb.png
https://www.asu.cas.cz/~asteroid/04528_2022c_p1.png

More data (errors < 0.02 mag) are needed to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 4-21 2.67 0.245
2022- 4-22 13.69 0.245
2022- 4-24 0.71 0.245
2022- 4-25 11.73 0.245
2022- 4-26 22.75 0.245
2022- 4-28 9.77 0.245
2022- 4-29 20.79 0.245
2022- 5- 1 7.81 0.245
2022- 5- 2 18.83 0.245
2022- 5- 4 5.85 0.245
2022- 5- 5 16.87 0.245
2022- 5- 7 3.89 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2022- 4-20 9.15 0.745
2022- 4-21 20.17 0.745
2022- 4-23 7.19 0.745
2022- 4-24 18.21 0.745
2022- 4-26 5.23 0.745
2022- 4-27 16.25 0.745
2022- 4-29 3.27 0.745
2022- 4-30 14.29 0.745
2022- 5- 2 1.31 0.745
2022- 5- 3 12.33 0.745
2022- 5- 4 23.35 0.745
2022- 5- 6 10.37 0.745
2022- 5- 7 21.39 0.745

Clear Skies, Petr [2022-04-11 12:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two nights by Alessandro Marchini and Lorenzo Franco joined in. Probable solution:
https://www.asu.cas.cz/~asteroid/04528_2022a_porb.png
https://www.asu.cas.cz/~asteroid/04528_2022a_p1.png

More data (errors <= 0.02 mag) are needed to nail it down. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-28 18.44 0.250
2022- 3-30 5.44 0.250
2022- 3-31 16.44 0.250
2022- 4- 2 3.44 0.250
2022- 4- 3 14.44 0.250
2022- 4- 5 1.44 0.250
2022- 4- 6 12.44 0.250
2022- 4- 7 23.44 0.250
2022- 4- 9 10.44 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-29 11.75 0.745
2022- 3-30 22.75 0.745
2022- 4- 1 9.75 0.745
2022- 4- 2 20.75 0.745
2022- 4- 4 7.75 0.745
2022- 4- 5 18.75 0.745
2022- 4- 7 5.75 0.745
2022- 4- 8 16.75 0.745

Clear Skies, Petr [2022-03-28 12:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative lc decomposition:
https://www.asu.cas.cz/~asteroid/04528_2022a_p1.png
https://www.asu.cas.cz/~asteroid/04528_2022a_porb.png
(The period in the 2nd plot above was set just for the plotting purpose. There is no real solution for P_orb yet.)

More data (errors not greater than 0.02 mag) are needed.

Clear Skies, Petr [2022-03-23 07:42, Ondrejov] Message sent to BinAstPhotSurvey conference

(6177) Fecamp (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5122, copied below for your convenience.

Cheers, Petr

(6177) FECAMP
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; M. Husarik, G. Cervak, and M. Pikler, Skalnate Pleso Observatory;
R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; A. Leroy,
Uranoscope de l'Ile de France, Gretz-Armainvilliers, France; and P. Sogorb,
La Bastide des Jourdans, France, report that photometric observations taken
with a 0.35-m telescope at the Sopot Observatory in Serbia, 0.61-m and 1.3-m
telescopes at the Skalnate Pleso Observatory, a 0.50-m telescope at the Shed
of Science South Observatory, a 0.25-m telescope at the Uranoscope de l'Ile
de France, and a 0.28-m telescope at the Bastidan Observatory in France
during Feb. 14-Apr. 7 reveal that minor planet (6177) is a binary system with
an orbital period of 22.105 Â± 0.005 hr. The primary shows a period of
4.4559 Â± 0.0003 hr and has a lightcurve amplitude of 0.14 magnitude at
solar phases 2-11 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.16 to 0.32 magnitude deep indicate
a secondary-to-primary mean-diameter ratio of 0.40 Â± 0.02. The
secondary appears synchronous and has a light-curve amplitude (in the
combined primary-plus-secondary light curve) of 0.03 mag, suggesting a
moderately elongated shape with an equatorial-axis ratio of 1.2 Â± 0.1.

2022 May 12 (CBET 5122) Daniel W. E. Green [2022-05-13 08:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
https://www.asu.cas.cz/~asteroid/06177_2022a_porb.png
https://www.asu.cas.cz/~asteroid/06177_2022a_p1.png
https://www.asu.cas.cz/~asteroid/06177_2022b_porb.png
https://www.asu.cas.cz/~asteroid/06177_2022b_p1.png
https://www.asu.cas.cz/~asteroid/06177_2022c_porb.png
https://www.asu.cas.cz/~asteroid/06177_2022c_p1.png

More data (errors < 0.025 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 4-20 10.22 0.241
2022- 4-21 8.32 0.241
2022- 4-22 6.43 0.241
2022- 4-23 4.53 0.241
2022- 4-24 2.64 0.241
2022- 4-25 0.74 0.241
2022- 4-25 22.85 0.241
2022- 4-26 20.95 0.241
2022- 4-27 19.06 0.241
2022- 4-28 17.16 0.241
2022- 4-29 15.27 0.241
2022- 4-30 13.37 0.241
2022- 5- 1 11.48 0.241
2022- 5- 2 9.58 0.241
2022- 5- 3 7.69 0.241
2022- 5- 4 5.79 0.241
2022- 5- 5 3.90 0.241
2022- 5- 6 2.00 0.241
2022- 5- 7 0.11 0.241
2022- 5- 7 22.21 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2022- 4-20 21.35 0.745
2022- 4-21 19.45 0.745
2022- 4-22 17.56 0.745
2022- 4-23 15.66 0.745
2022- 4-24 13.77 0.745
2022- 4-25 11.87 0.745
2022- 4-26 9.98 0.745
2022- 4-27 8.08 0.745
2022- 4-28 6.19 0.745
2022- 4-29 4.29 0.745
2022- 4-30 2.40 0.745
2022- 5- 1 0.50 0.745
2022- 5- 1 22.61 0.745
2022- 5- 2 20.71 0.745
2022- 5- 3 18.82 0.745
2022- 5- 4 16.92 0.745
2022- 5- 5 15.03 0.745
2022- 5- 6 13.13 0.745
2022- 5- 7 11.24 0.745

Clear Skies, Petr [2022-04-12 07:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run last night on 4/6 UT. starting at 2UT.

Russ [2022-04-07 01:04, Shed of Science] Message sent to observers

· Vladimir Benishek took more data for the 0.25-phase event; updated solution:
https://www.asu.cas.cz/~asteroid/06177_2022a_porb.png
https://www.asu.cas.cz/~asteroid/06177_2022a_p1.png

More data (errors < 0.025 mag) are still needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 0.95 0.250
2022- 3-21 23.05 0.250
2022- 3-22 21.16 0.250
2022- 3-23 19.26 0.250
2022- 3-24 17.37 0.250
2022- 3-25 15.47 0.250
2022- 3-26 13.58 0.250
2022- 3-27 11.68 0.250
2022- 3-28 9.79 0.250
2022- 3-29 7.89 0.250
2022- 3-30 6.00 0.250
2022- 3-31 4.10 0.250
2022- 4- 1 2.21 0.250
2022- 4- 2 0.31 0.250
2022- 4- 2 22.42 0.250
2022- 4- 3 20.52 0.250
2022- 4- 4 18.63 0.250
2022- 4- 5 16.73 0.250
2022- 4- 6 14.84 0.250
2022- 4- 7 12.94 0.250
2022- 4- 8 11.05 0.250
2022- 4- 9 9.15 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 12.01 0.751
2022- 3-22 10.11 0.751
2022- 3-23 8.22 0.751
2022- 3-24 6.32 0.751
2022- 3-25 4.43 0.751
2022- 3-26 2.53 0.751
2022- 3-27 0.64 0.751
2022- 3-27 22.74 0.751
2022- 3-28 20.85 0.751
2022- 3-29 18.95 0.751
2022- 3-30 17.06 0.751
2022- 3-31 15.16 0.751
2022- 4- 1 13.27 0.751
2022- 4- 2 11.37 0.751
2022- 4- 3 9.48 0.751
2022- 4- 4 7.58 0.751
2022- 4- 5 5.69 0.751
2022- 4- 6 3.79 0.751
2022- 4- 7 1.90 0.751
2022- 4- 8 0.00 0.751
2022- 4- 8 22.11 0.751
2022- 4- 9 20.21 0.751

Clear Skies, Petr [2022-03-16 12:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
https://www.asu.cas.cz/~asteroid/06177_2022a_porb.png
https://www.asu.cas.cz/~asteroid/06177_2022a_p1.png

More data (errors < 0.025 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 0.17 0.241
2022- 3-21 22.25 0.241
2022- 3-22 20.33 0.241
2022- 3-23 18.41 0.241
2022- 3-24 16.49 0.241
2022- 3-25 14.57 0.241
2022- 3-26 12.65 0.241
2022- 3-27 10.73 0.241
2022- 3-28 8.81 0.241
2022- 3-29 6.89 0.241
2022- 3-30 4.97 0.241
2022- 3-31 3.05 0.241
2022- 4- 1 1.13 0.241
2022- 4- 1 23.21 0.241
2022- 4- 2 21.29 0.241
2022- 4- 3 19.37 0.241
2022- 4- 4 17.45 0.241
2022- 4- 5 15.53 0.241
2022- 4- 6 13.61 0.241
2022- 4- 7 11.69 0.241
2022- 4- 8 9.77 0.241
2022- 4- 9 7.85 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 11.46 0.753
2022- 3-22 9.54 0.753
2022- 3-23 7.62 0.753
2022- 3-24 5.70 0.753
2022- 3-25 3.78 0.753
2022- 3-26 1.86 0.753
2022- 3-26 23.94 0.753
2022- 3-27 22.02 0.753
2022- 3-28 20.10 0.753
2022- 3-29 18.18 0.753
2022- 3-30 16.26 0.753
2022- 3-31 14.34 0.753
2022- 4- 1 12.42 0.753
2022- 4- 2 10.50 0.753
2022- 4- 3 8.58 0.753
2022- 4- 4 6.66 0.753
2022- 4- 5 4.74 0.753
2022- 4- 6 2.82 0.753
2022- 4- 7 0.90 0.753
2022- 4- 7 22.98 0.753
2022- 4- 8 21.06 0.753
2022- 4- 9 19.14 0.753

Clear Skies, Petr [2022-03-15 12:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Arnaud Leroy has observed this one. A likely solution:
https://www.asu.cas.cz/~asteroid/06177_2022a_porb.png
https://www.asu.cas.cz/~asteroid/06177_2022a_p1.png

More data (errors < 0.025 mag) are needed to nail it down. Event ephemeris for the likely solution (but don't limit your observations just around the predicted mid-event times, it is still not very reliable):

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-28 18.39 0.241
2022- 3- 1 16.47 0.241
2022- 3- 2 14.55 0.241
2022- 3- 3 12.63 0.241
2022- 3- 4 10.71 0.241
2022- 3- 5 8.79 0.241
2022- 3- 6 6.87 0.241
2022- 3- 7 4.95 0.241
2022- 3- 8 3.03 0.241
2022- 3- 9 1.11 0.241
2022- 3- 9 23.19 0.241
2022- 3-10 21.27 0.241
2022- 3-11 19.35 0.241
2022- 3-12 17.43 0.241
2022- 3-13 15.51 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3- 1 5.66 0.751
2022- 3- 2 3.74 0.751
2022- 3- 3 1.82 0.751
2022- 3- 3 23.90 0.751
2022- 3- 4 21.98 0.751
2022- 3- 5 20.06 0.751
2022- 3- 6 18.14 0.751
2022- 3- 7 16.22 0.751
2022- 3- 8 14.30 0.751
2022- 3- 9 12.38 0.751
2022- 3-10 10.46 0.751
2022- 3-11 8.54 0.751
2022- 3-12 6.62 0.751
2022- 3-13 4.70 0.751

Clear Skies, Petr [2022-02-28 11:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot, found it to be a binary candidate. There are a few possible values for the orbital period; a lc decomposition for one of them:
https://www.asu.cas.cz/~asteroid/06177_2022a_porb.png
https://www.asu.cas.cz/~asteroid/06177_2022a_p1.png

More data (errors <= 0.02 mag) are needed to nail it down.

Clear Skies, Petr [2022-02-25 09:23, Ondrejov] Message sent to BinAstPhotSurvey conference

(29997) 2000 AE127 [Add new note]
[Send data to: peter@asu.cas.cz ]
· I did runs on this on Apr 30 and May 1.
Don [2022-05-01 23:37, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2860) Pasacentennium (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5116, copied below for your convenience.

Cheers, Petr

(2860) PASACENTENNIUM
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
K. Hornoch, and P. Kusnirak, Ondrejov Observatory; B. Warner, Center for
Solar System Studies, Eaton, CO, U.S.A.; P. Sogorb, La Bastide des Jourdans,
France; P. Bacci and M. Maestripieri, Astronomical Observatory, San Marcello
Pistoiese, Italy; and R. Montaigut and A. Leroy, OPERA Observatory, France,
report that photometric observations taken with a 0.35-m telescope at the
Sopot Observatory in Serbia, a 0.65-m telescope at Ondrejov Observatory, a
0.35-m telescope at the Center for Solar System Studies, a 0.28-m telescope
at the Bastidan Observatory in France, a 0.60-m telescope at the San Marcello
Pistoiese Observatory, and a 0.20-m telescope at the OPERA Observatory during
2021 Nov. 16-2022 Mar. 3 reveal that minor planet (2860) is a binary system
with an orbital period of 119.7 Â± 0.3 hr. The primary shows a period of
2.6609 Â± 0.0001 hr and has a lightcurve amplitude of 0.17 magnitude at
solar phases 17-22 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.18 magnitude deep indicate a secondary-
to-primary mean-diameter ratio of 0.42 Â± 0.02. The mean absolute magnitude
in the Cousins R photometric system is H_R = 12.50 Â± 0.12, assuming a
phase-relation slope parameter G = 0.24 Â± 0.11.

2022 April 21 (CBET 5116) Daniel W. E. Green [2022-04-22 07:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/02860_2021a_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021a_p1.png
http://www.asu.cas.cz/~asteroid/02860_2021b_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021b_p1.png
http://www.asu.cas.cz/~asteroid/02860_2021c_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021c_p1.png
http://www.asu.cas.cz/~asteroid/02860_2021d_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021d_p1.png

Last data (with errors not greater than 0.02 mag) before we publish this one on CBET would be good to take. Event ephemeris (but don't limit your observations too closely around the predicted mid-event times; the events may evolve):

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 10.0 0.264
2022- 3-26 9.7 0.264
2022- 3-31 9.4 0.264
2022- 4- 5 9.1 0.264

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-23 18.4 0.735
2022- 3-28 18.1 0.735
2022- 4- 2 17.8 0.735

Clear Skies, Petr [2022-03-10 09:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current solution for this one:
http://www.asu.cas.cz/~asteroid/02860_2021a_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021a_p1.png
http://www.asu.cas.cz/~asteroid/02860_2021b_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021b_p1.png
http://www.asu.cas.cz/~asteroid/02860_2021c_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021c_p1.png

More data (with errors not greater than 0.02 mag) are needed. Event ephemeris (but don't limit your observations too closely around the predicted mid-event times; the events may evolve):

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-19 11.3 0.264
2022- 2-24 10.9 0.264
2022- 3- 1 10.6 0.264
2022- 3- 6 10.2 0.264

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-21 19.5 0.734
2022- 2-26 19.2 0.734
2022- 3- 3 18.8 0.734
2022- 3- 8 18.5 0.734

Clear Skies, Petr [2022-02-10 09:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· A tentative solution with our current data for this one:
http://www.asu.cas.cz/~asteroid/02860_2021a_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021a_p1.png

More data (preferably with errors not greater than 0.02 mag) are needed to confirm it. Event ephemeris for the tentative solution (but don't limit your observations just to around the predicted mid-event times; the solution may be wrong):

Date/Time UTC (LTc.) Phase
--------------------------
2022- 1-25 13.5 0.270
2022- 1-30 13.1 0.270
2022- 2- 4 12.7 0.270
2022- 2- 9 12.3 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2022- 1-22 21.2 0.732
2022- 1-27 20.8 0.732
2022- 2- 1 20.4 0.732
2022- 2- 6 20.0 0.732

Clear Skies, Petr [2022-01-13 14:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a serious binary candidate. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/02860_2021a_porb.png
http://www.asu.cas.cz/~asteroid/02860_2021a_p1.png
(The P_orb value was set there for plotting purpose only; there is no real solution for the orbit period yet.)

More data (errors < 0.02 mag) are needed to establish it well. I encourage others here to help out Vladimir with it.

Clear Skies, Petr [2021-12-09 13:33, Ondrejov] Message sent to BinAstPhotSurvey conference

(4411) Kochibunkyo (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5114, copied below for your convenience.

Cheers, Petr

(4411) KOCHIBUNKYO
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during Feb. 2-Mar. 26 reveal that minor planet (4411) is a
binary system with an orbital period of 11.985 Â± 0.010 hr. The primary
shows a period of 2.69614 Â± 0.00006 hr and has a lightcurve amplitude of
0.16 magnitude at solar phases 2-16 degrees, suggesting a nearly spheroidal
shape. Mutual eclipse/occultation events that are 0.05 to 0.09 magnitude
deep indicate a secondary-to-primary mean-diameter ratio of 0.21 Â± 0.02.

2022 April 15 (CBET 5114) Daniel W. E. Green [2022-04-19 07:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this again tonight to cover the 0.245 event
Russ [2022-03-26 02:00, Shed of Science] Message sent to observers

· Starting on this one tonight to cover the .245 event.

Russ [2022-03-25 02:36, Shed of Science]

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/04411_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04411_2022a_p1.png

More data (errors <= 0.02 mag) would be good to improve the solution, before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 3.54 0.245
2022- 3-21 15.53 0.245
2022- 3-22 3.51 0.245
2022- 3-22 15.50 0.245
2022- 3-23 3.48 0.245
2022- 3-23 15.47 0.245
2022- 3-24 3.45 0.245
2022- 3-24 15.44 0.245
2022- 3-25 3.42 0.245
2022- 3-25 15.41 0.245
2022- 3-26 3.39 0.245
2022- 3-26 15.38 0.245
2022- 3-27 3.36 0.245
2022- 3-27 15.35 0.245
2022- 3-28 3.33 0.245
2022- 3-28 15.32 0.245
2022- 3-29 3.30 0.245
2022- 3-29 15.29 0.245
2022- 3-30 3.27 0.245
2022- 3-30 15.26 0.245
2022- 3-31 3.24 0.245
2022- 3-31 15.23 0.245
2022- 4- 1 3.21 0.245
2022- 4- 1 15.20 0.245
2022- 4- 2 3.18 0.245
2022- 4- 2 15.17 0.245
2022- 4- 3 3.15 0.245
2022- 4- 3 15.14 0.245
2022- 4- 4 3.12 0.245
2022- 4- 4 15.11 0.245
2022- 4- 5 3.09 0.245
2022- 4- 5 15.08 0.245
2022- 4- 6 3.06 0.245
2022- 4- 6 15.05 0.245
2022- 4- 7 3.03 0.245
2022- 4- 7 15.02 0.245
2022- 4- 8 3.00 0.245
2022- 4- 8 14.99 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 9.67 0.757
2022- 3-21 21.65 0.757
2022- 3-22 9.64 0.757
2022- 3-22 21.62 0.757
2022- 3-23 9.61 0.757
2022- 3-23 21.59 0.757
2022- 3-24 9.58 0.757
2022- 3-24 21.56 0.757
2022- 3-25 9.55 0.757
2022- 3-25 21.53 0.757
2022- 3-26 9.52 0.757
2022- 3-26 21.50 0.757
2022- 3-27 9.49 0.757
2022- 3-27 21.47 0.757
2022- 3-28 9.46 0.757
2022- 3-28 21.44 0.757
2022- 3-29 9.43 0.757
2022- 3-29 21.41 0.757
2022- 3-30 9.40 0.757
2022- 3-30 21.38 0.757
2022- 3-31 9.37 0.757
2022- 3-31 21.35 0.757
2022- 4- 1 9.34 0.757
2022- 4- 1 21.32 0.757
2022- 4- 2 9.31 0.757
2022- 4- 2 21.29 0.757
2022- 4- 3 9.28 0.757
2022- 4- 3 21.26 0.757
2022- 4- 4 9.25 0.757
2022- 4- 4 21.23 0.757
2022- 4- 5 9.22 0.757
2022- 4- 5 21.20 0.757
2022- 4- 6 9.19 0.757
2022- 4- 6 21.17 0.757
2022- 4- 7 9.16 0.757
2022- 4- 7 21.14 0.757
2022- 4- 8 9.13 0.757
2022- 4- 8 21.11 0.757

Clear Skies, Petr [2022-03-18 08:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this one tonight.

Regards,

Russ [2022-03-06 02:36, Shed of Science] Message sent to observers

· More data taken for this one by Vladimir Benishek and Russ Durkee. A likely solution (but still a bit weak):
http://www.asu.cas.cz/~asteroid/04411_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04411_2022a_p1.png

More data (errors <= 0.015 mag) are needed to nail it down. Event ephemeris for the likely solution:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3- 1 16.07 0.288
2022- 3- 2 4.05 0.288
2022- 3- 2 16.03 0.288
2022- 3- 3 4.01 0.288
2022- 3- 3 15.99 0.288
2022- 3- 4 3.97 0.288
2022- 3- 4 15.95 0.288
2022- 3- 5 3.93 0.288
2022- 3- 5 15.91 0.288
2022- 3- 6 3.89 0.288
2022- 3- 6 15.87 0.288
2022- 3- 7 3.85 0.288
2022- 3- 7 15.83 0.288
2022- 3- 8 3.81 0.288
2022- 3- 8 15.79 0.288
2022- 3- 9 3.77 0.288
2022- 3- 9 15.75 0.288
2022- 3-10 3.73 0.288
2022- 3-10 15.71 0.288
2022- 3-11 3.69 0.288
2022- 3-11 15.67 0.288

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3- 1 21.96 0.780
2022- 3- 2 9.94 0.780
2022- 3- 2 21.92 0.780
2022- 3- 3 9.90 0.780
2022- 3- 3 21.88 0.780
2022- 3- 4 9.86 0.780
2022- 3- 4 21.84 0.780
2022- 3- 5 9.82 0.780
2022- 3- 5 21.80 0.780
2022- 3- 6 9.78 0.780
2022- 3- 6 21.76 0.780
2022- 3- 7 9.74 0.780
2022- 3- 7 21.72 0.780
2022- 3- 8 9.70 0.780
2022- 3- 8 21.68 0.780
2022- 3- 9 9.66 0.780
2022- 3- 9 21.64 0.780
2022- 3-10 9.62 0.780
2022- 3-10 21.60 0.780
2022- 3-11 9.58 0.780
2022- 3-11 21.56 0.780

Clear Skies, Petr [2022-03-01 10:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir took more data for this one. There are a few possible values for the orbit period; a lc decomposition for one of them:
http://www.asu.cas.cz/~asteroid/04411_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04411_2022a_p1.png

More data (errors <= 0.015 mag) are needed to resolve. As the candidate periods are not far from commensurability with Earth's rotation, at least one nightly run from America will be probably needed to resolve.

Clear Skies, Petr [2022-02-14 14:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. Solution for P_orb is far from unique; a lc decomposition for one of several possible values:
http://www.asu.cas.cz/~asteroid/04411_2022a_porb.png
http://www.asu.cas.cz/~asteroid/04411_2022a_p1.png

Vladimir would probably appreciate a help by others. Data with errors not greater than 0.015 mag are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2022-02-07 09:18, Ondrejov] Message sent to BinAstPhotSurvey conference

(5407) 1992 AX (Finished) - binary [Add new note]
· At last a clear night! Doing a run tonight on this return binary to catch the 0.755 phase event. [2022-03-30 00:44, Sugarloaf] Message sent to observers

· Our current data for this binary Mars-crosser:
http://www.asu.cas.cz/~asteroid/05407_2022a_porb.png
http://www.asu.cas.cz/~asteroid/05407_2022a_p1.png
http://www.asu.cas.cz/~asteroid/05407_2022b_porb.png
http://www.asu.cas.cz/~asteroid/05407_2022b_p1.png
http://www.asu.cas.cz/~asteroid/05407_2022c_porb.png
http://www.asu.cas.cz/~asteroid/05407_2022c_p1.png

More high-quality data (errors 0.01 mag; don't bother in less ideal conditions) would be useful for future modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 9.32 0.250
2022- 3-21 22.83 0.250
2022- 3-22 12.34 0.250
2022- 3-23 1.84 0.250
2022- 3-23 15.35 0.250
2022- 3-24 4.86 0.250
2022- 3-24 18.37 0.250
2022- 3-25 7.88 0.250
2022- 3-25 21.38 0.250
2022- 3-26 10.89 0.250
2022- 3-27 0.40 0.250
2022- 3-27 13.91 0.250
2022- 3-28 3.42 0.250
2022- 3-28 16.92 0.250
2022- 3-29 6.43 0.250
2022- 3-29 19.94 0.250
2022- 3-30 9.45 0.250
2022- 3-30 22.96 0.250
2022- 3-31 12.46 0.250
2022- 4- 1 1.97 0.250
2022- 4- 1 15.48 0.250
2022- 4- 2 4.99 0.250
2022- 4- 2 18.50 0.250
2022- 4- 3 8.00 0.250
2022- 4- 3 21.51 0.250
2022- 4- 4 11.02 0.250
2022- 4- 5 0.53 0.250
2022- 4- 5 14.04 0.250
2022- 4- 6 3.54 0.250
2022- 4- 6 17.05 0.250
2022- 4- 7 6.56 0.250
2022- 4- 7 20.07 0.250
2022- 4- 8 9.58 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 3-21 2.63 0.755
2022- 3-21 16.13 0.755
2022- 3-22 5.64 0.755
2022- 3-22 19.15 0.755
2022- 3-23 8.66 0.755
2022- 3-23 22.17 0.755
2022- 3-24 11.67 0.755
2022- 3-25 1.18 0.755
2022- 3-25 14.69 0.755
2022- 3-26 4.20 0.755
2022- 3-26 17.71 0.755
2022- 3-27 7.21 0.755
2022- 3-27 20.72 0.755
2022- 3-28 10.23 0.755
2022- 3-28 23.74 0.755
2022- 3-29 13.25 0.755
2022- 3-30 2.75 0.755
2022- 3-30 16.26 0.755
2022- 3-31 5.77 0.755
2022- 3-31 19.28 0.755
2022- 4- 1 8.79 0.755
2022- 4- 1 22.29 0.755
2022- 4- 2 11.80 0.755
2022- 4- 3 1.31 0.755
2022- 4- 3 14.82 0.755
2022- 4- 4 4.33 0.755
2022- 4- 4 17.83 0.755
2022- 4- 5 7.34 0.755
2022- 4- 5 20.85 0.755
2022- 4- 6 10.36 0.755
2022- 4- 6 23.87 0.755
2022- 4- 7 13.37 0.755
2022- 4- 8 2.88 0.755

Clear Skies, Petr [2022-03-18 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 03:20 UT.
Don [2022-03-11 03:20, Sugarloaf] Message sent to observers

· I observed this return binary on Mar 4 and again on Mar 5.
Don [2022-03-05 00:16, Sugarloaf]

· Our current data for this binary Mars-crosser:
http://www.asu.cas.cz/~asteroid/05407_2022a_porb.png
http://www.asu.cas.cz/~asteroid/05407_2022a_p1.png
http://www.asu.cas.cz/~asteroid/05407_2022b_porb.png
http://www.asu.cas.cz/~asteroid/05407_2022b_p1.png

More high-quality data (errors 0.01 mag; don't bother in less ideal conditions) would be useful for future modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-20 2.90 0.250
2022- 2-20 16.41 0.250
2022- 2-21 5.92 0.250
2022- 2-21 19.43 0.250
2022- 2-22 8.94 0.250
2022- 2-22 22.44 0.250
2022- 2-23 11.95 0.250
2022- 2-24 1.46 0.250
2022- 2-24 14.97 0.250
2022- 2-25 4.48 0.250
2022- 2-25 17.98 0.250
2022- 2-26 7.49 0.250
2022- 2-26 21.00 0.250
2022- 2-27 10.51 0.250
2022- 2-28 0.02 0.250
2022- 2-28 13.52 0.250
2022- 3- 1 3.03 0.250
2022- 3- 1 16.54 0.250
2022- 3- 2 6.05 0.250
2022- 3- 2 19.56 0.250
2022- 3- 3 9.06 0.250
2022- 3- 3 22.57 0.250
2022- 3- 4 12.08 0.250
2022- 3- 5 1.59 0.250
2022- 3- 5 15.10 0.250
2022- 3- 6 4.60 0.250
2022- 3- 6 18.11 0.250
2022- 3- 7 7.62 0.250
2022- 3- 7 21.13 0.250
2022- 3- 8 10.64 0.250
2022- 3- 9 0.14 0.250
2022- 3- 9 13.65 0.250
2022- 3-10 3.16 0.250
2022- 3-10 16.67 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2-20 9.74 0.757
2022- 2-20 23.25 0.757
2022- 2-21 12.76 0.757
2022- 2-22 2.27 0.757
2022- 2-22 15.78 0.757
2022- 2-23 5.28 0.757
2022- 2-23 18.79 0.757
2022- 2-24 8.30 0.757
2022- 2-24 21.81 0.757
2022- 2-25 11.32 0.757
2022- 2-26 0.82 0.757
2022- 2-26 14.33 0.757
2022- 2-27 3.84 0.757
2022- 2-27 17.35 0.757
2022- 2-28 6.86 0.757
2022- 2-28 20.36 0.757
2022- 3- 1 9.87 0.757
2022- 3- 1 23.38 0.757
2022- 3- 2 12.89 0.757
2022- 3- 3 2.40 0.757
2022- 3- 3 15.90 0.757
2022- 3- 4 5.41 0.757
2022- 3- 4 18.92 0.757
2022- 3- 5 8.43 0.757
2022- 3- 5 21.94 0.757
2022- 3- 6 11.44 0.757
2022- 3- 7 0.95 0.757
2022- 3- 7 14.46 0.757
2022- 3- 8 3.97 0.757
2022- 3- 8 17.48 0.757
2022- 3- 9 6.98 0.757
2022- 3- 9 20.49 0.757
2022- 3-10 10.00 0.757
2022- 3-10 23.51 0.757
2022- 3-11 13.02 0.757

Clear Skies, Petr [2022-02-17 13:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this tonight.

Russ [2022-02-11 02:13, Shed of Science] Message sent to observers

· Doing a run on this one tonight.
Don [2022-02-09 00:07, Sugarloaf]

· Starting a run on this one tonight

Russ [2022-02-06 03:15, Shed of Science]

· Don Pray took first data for this returned binary Mars-crosser in its current apparition. A lc decomposition (somewhat tentative):
http://www.asu.cas.cz/~asteroid/05407_2022a_porb.png
http://www.asu.cas.cz/~asteroid/05407_2022a_p1.png

More high-quality data (errors 0.01 mag; don't bother in less ideal conditions) are needed. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2- 2 9.57 0.250
2022- 2- 2 23.08 0.250
2022- 2- 3 12.58 0.250
2022- 2- 4 2.09 0.250
2022- 2- 4 15.60 0.250
2022- 2- 5 5.11 0.250
2022- 2- 5 18.62 0.250
2022- 2- 6 8.12 0.250
2022- 2- 6 21.63 0.250
2022- 2- 7 11.14 0.250
2022- 2- 8 0.65 0.250
2022- 2- 8 14.16 0.250
2022- 2- 9 3.66 0.250
2022- 2- 9 17.17 0.250
2022- 2-10 6.68 0.250
2022- 2-10 20.19 0.250
2022- 2-11 9.70 0.250
2022- 2-11 23.20 0.250
2022- 2-12 12.71 0.250
2022- 2-13 2.22 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2022- 2- 2 16.30 0.749
2022- 2- 3 5.81 0.749
2022- 2- 3 19.32 0.749
2022- 2- 4 8.83 0.749
2022- 2- 4 22.33 0.749
2022- 2- 5 11.84 0.749
2022- 2- 6 1.35 0.749
2022- 2- 6 14.86 0.749
2022- 2- 7 4.37 0.749
2022- 2- 7 17.87 0.749
2022- 2- 8 7.38 0.749
2022- 2- 8 20.89 0.749
2022- 2- 9 10.40 0.749
2022- 2- 9 23.91 0.749
2022- 2-10 13.41 0.749
2022- 2-11 2.92 0.749
2022- 2-11 16.43 0.749
2022- 2-12 5.94 0.749
2022- 2-12 19.45 0.749
2022- 2-13 8.95 0.749

Clear Skies, Petr [2022-02-02 08:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this on Feb 1.
Don [2022-02-02 01:51, Sugarloaf]

· Finished in the 3rd apparition, modeling will start after completing calibrations. Petr [2012-05-02 10:30, Ondrejov]

· Observing this one from 19:30 UT. Best wishes, Kamil, Marek and student [2012-04-19 20:16, Ondrejov] Message sent to observers

· Good data were taken from Modra and Ondrejov in March, interesting events evolution seen:
http://www.asu.cas.cz/~asteroid/05407_12c_porb.png
http://www.asu.cas.cz/~asteroid/05407_12c_p1.png
http://www.asu.cas.cz/~asteroid/05407_12b_porb.png
http://www.asu.cas.cz/~asteroid/05407_12b_p1.png
http://www.asu.cas.cz/~asteroid/05407_12a_porb.png
http://www.asu.cas.cz/~asteroid/05407_12a_p1.png

Monitoring the events in the April lunation (which will be the last lunation for this apparition) will be useful for modeling; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-10 0.88 0.229
2012- 4-10 14.39 0.229
2012- 4-11 3.91 0.229
2012- 4-11 17.42 0.229
2012- 4-12 6.94 0.229
2012- 4-12 20.45 0.229
2012- 4-13 9.97 0.229
2012- 4-13 23.48 0.229
2012- 4-14 13.00 0.229
2012- 4-15 2.51 0.229
2012- 4-15 16.03 0.229
2012- 4-16 5.54 0.229
2012- 4-16 19.06 0.229
2012- 4-17 8.57 0.229
2012- 4-17 22.09 0.229
2012- 4-18 11.60 0.229
2012- 4-19 1.12 0.229
2012- 4-19 14.63 0.229
2012- 4-20 4.15 0.229
2012- 4-20 17.66 0.229
2012- 4-21 7.18 0.229
2012- 4-21 20.69 0.229
2012- 4-22 10.21 0.229
2012- 4-22 23.72 0.229
2012- 4-23 13.24 0.229
2012- 4-24 2.75 0.229
2012- 4-24 16.27 0.229
2012- 4-25 5.78 0.229
2012- 4-25 19.30 0.229
2012- 4-26 8.81 0.229
2012- 4-26 22.33 0.229
2012- 4-27 11.84 0.229

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-10 7.48 0.718
2012- 4-10 21.00 0.718
2012- 4-11 10.51 0.718
2012- 4-12 0.03 0.718
2012- 4-12 13.54 0.718
2012- 4-13 3.06 0.718
2012- 4-13 16.57 0.718
2012- 4-14 6.09 0.718
2012- 4-14 19.60 0.718
2012- 4-15 9.12 0.718
2012- 4-15 22.63 0.718
2012- 4-16 12.15 0.718
2012- 4-17 1.66 0.718
2012- 4-17 15.18 0.718
2012- 4-18 4.69 0.718
2012- 4-18 18.21 0.718
2012- 4-19 7.72 0.718
2012- 4-19 21.24 0.718
2012- 4-20 10.75 0.718
2012- 4-21 0.27 0.718
2012- 4-21 13.78 0.718
2012- 4-22 3.30 0.718
2012- 4-22 16.81 0.718
2012- 4-23 6.33 0.718
2012- 4-23 19.84 0.718
2012- 4-24 9.36 0.718
2012- 4-24 22.87 0.718
2012- 4-25 12.39 0.718
2012- 4-26 1.90 0.718
2012- 4-26 15.42 0.718
2012- 4-27 4.93 0.718
2012- 4-27 18.45 0.718

Clear Skies, Petr [2012-04-02 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 19:00 UT in very good conditions. Best wishes, Kamil [2012-03-21 21:08, Ondrejov] Message sent to observers

· Observing from 18:30 UT under good sky conditions. Leos [2012-03-17 23:05, Modra]

· Observing from 18 UT but under worse sky conditions. Leos [2012-03-16 21:38, Modra] Message sent to observers

· Observed in night 15/16 03 2012 from 21:45 to 01:15 UT.
leos [2012-03-16 12:14, Modra]

· Observing from 18:15 UT. Jozef, Stefan. [2012-03-09 18:33, Modra]

· Good data covering both events twice were taken in this lunation, especially by Jozef, Leos and Stefan from Modra, by Kamil from here and by Joe from NC:
http://www.asu.cas.cz/~asteroid/05407_12b_porb.png
http://www.asu.cas.cz/~asteroid/05407_12b_p1.png
http://www.asu.cas.cz/~asteroid/05407_12a_porb.png
http://www.asu.cas.cz/~asteroid/05407_12a_p1.png
No more data are needed in this lunation. Resuming the events monitoring in the next lunation will be useful for subsequent modeling; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-11 18.45 0.255
2012- 3-12 7.97 0.255
2012- 3-12 21.48 0.255
2012- 3-13 11.00 0.255
2012- 3-14 0.51 0.255
2012- 3-14 14.03 0.255
2012- 3-15 3.54 0.255
2012- 3-15 17.06 0.255
2012- 3-16 6.57 0.255
2012- 3-16 20.09 0.255
2012- 3-17 9.60 0.255
2012- 3-17 23.12 0.255
2012- 3-18 12.63 0.255
2012- 3-19 2.15 0.255
2012- 3-19 15.66 0.255
2012- 3-20 5.18 0.255
2012- 3-20 18.69 0.255
2012- 3-21 8.21 0.255
2012- 3-21 21.72 0.255
2012- 3-22 11.24 0.255
2012- 3-23 0.75 0.255
2012- 3-23 14.27 0.255
2012- 3-24 3.78 0.255
2012- 3-24 17.30 0.255
2012- 3-25 6.81 0.255
2012- 3-25 20.33 0.255
2012- 3-26 9.84 0.255
2012- 3-26 23.36 0.255
2012- 3-27 12.87 0.255
2012- 3-28 2.39 0.255
2012- 3-28 15.90 0.255
2012- 3-29 5.42 0.255
2012- 3-29 18.93 0.255
2012- 3-30 8.45 0.255
2012- 3-30 21.96 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-12 1.20 0.755
2012- 3-12 14.72 0.755
2012- 3-13 4.23 0.755
2012- 3-13 17.75 0.755
2012- 3-14 7.26 0.755
2012- 3-14 20.78 0.755
2012- 3-15 10.29 0.755
2012- 3-15 23.81 0.755
2012- 3-16 13.32 0.755
2012- 3-17 2.84 0.755
2012- 3-17 16.35 0.755
2012- 3-18 5.87 0.755
2012- 3-18 19.38 0.755
2012- 3-19 8.90 0.755
2012- 3-19 22.41 0.755
2012- 3-20 11.93 0.755
2012- 3-21 1.44 0.755
2012- 3-21 14.96 0.755
2012- 3-22 4.47 0.755
2012- 3-22 17.99 0.755
2012- 3-23 7.50 0.755
2012- 3-23 21.02 0.755
2012- 3-24 10.53 0.755
2012- 3-25 0.05 0.755
2012- 3-25 13.56 0.755
2012- 3-26 3.08 0.755
2012- 3-26 16.59 0.755
2012- 3-27 6.11 0.755
2012- 3-27 19.62 0.755
2012- 3-28 9.14 0.755
2012- 3-28 22.65 0.755
2012- 3-29 12.17 0.755
2012- 3-30 1.68 0.755
2012- 3-30 15.20 0.755

Clear Skies, Petr [2012-02-22 13:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from ~19:30UT, in variable conditions. Leos, Jozef. [2012-02-21 19:32, Modra] Message sent to observers

· Observed tonight from ~17:35-21:00UT. Leos, Jozef [2012-02-21 00:58, Modra]

· planning to observe the 0.752 event [2012-02-21 00:46, Via Capote]

· planning to observe the 0.752 event [2012-02-20 00:18, Via Capote] Message sent to observers

· planning to observe the .752 event [2012-02-17 01:24, Via Capote]

· observed under excellent conditions from 08:30-11:00 UT [2012-02-15 13:51, Via Capote] Message sent to observers

· Good data by Jozef and Stefan from Modra, by Kamil from here and by Joe from NC, covering three events:
http://www.asu.cas.cz/~asteroid/05407_12b_porb.png
Cf. with data from the previous lunation:
http://www.asu.cas.cz/~asteroid/05407_12a_porb.png

One more coverage of the 0.75-phase event will be good for this lunation; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-15 17.03 0.752
2012- 2-16 6.55 0.752
2012- 2-16 20.07 0.752
2012- 2-17 9.58 0.752
2012- 2-17 23.10 0.752
2012- 2-18 12.62 0.752
2012- 2-19 2.13 0.752
2012- 2-19 15.65 0.752
2012- 2-20 5.17 0.752
2012- 2-20 18.68 0.752
2012- 2-21 8.20 0.752
2012- 2-21 21.72 0.752
2012- 2-22 11.24 0.752
2012- 2-23 0.75 0.752
2012- 2-23 14.27 0.752
2012- 2-24 3.79 0.752
2012- 2-24 17.30 0.752
2012- 2-25 6.82 0.752
2012- 2-25 20.34 0.752
2012- 2-26 9.85 0.752
2012- 2-26 23.37 0.752
2012- 2-27 12.89 0.752
2012- 2-28 2.41 0.752
2012- 2-28 15.92 0.752
2012- 2-29 5.44 0.752
2012- 2-29 18.96 0.752
2012- 3- 1 8.47 0.752
2012- 3- 1 21.99 0.752
2012- 3- 2 11.51 0.752
2012- 3- 3 1.02 0.752

Clear Skies, Petr [2012-02-15 10:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· About to begin observations to get phase 0.255 event at 0415 UT from NC. Very good conditions. Joe [2012-02-12 23:47, Dark Sky & PROMPT] Message sent to observers

· Trying to observe a 0.757-phase event. The observation could be ended too early due to incoming clouds. Best wishes, Kamil [2012-02-12 17:45, Ondrejov]

· Observing from 17:30UT. Regards, Jozef&Stefan. [2012-02-10 17:43, Modra]

· Nice data, Adrian, from the past night, they completed the coverage of the secondary event:
http://www.asu.cas.cz/~asteroid/05407_12_porb.png
http://www.asu.cas.cz/~asteroid/05407_12_p1.png

No more data are needed in this lunation, further monitoring in the next lunation will be good; the events ephemeris given here yesterday.

Clear Skies, Petr [2012-02-01 13:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· As I promised, I changed target nearly one hour ago to this. Adrian [2012-02-01 00:18, Modra]

· Great data for this return binary Mars-crosser were taken by Jozef and Stefan from Modra and by Jim Brinsfield from Via Capote:
http://www.asu.cas.cz/~asteroid/05407_12_porb.png
http://www.asu.cas.cz/~asteroid/05407_12_p1.png
The two periods are as observed in the 1997 binary discovery (Pravec et al. 2000) and the 2007 return apparitions. For the first time, we have clearly resolved the secondary event, it appears to be total and we get the first good estimate for the size ratio of the system D_2/D_1 = 0.21 +/- 0.02. The coverage of the primary event has been sufficient for this lunation, but one more coverage of the secondary event would be good to refine the size ratio estimate; one 4-h long high-quality session (clean of interferrences with background stars) centered at following event times would be good:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-31 12.14 0.757
2012- 2- 1 1.66 0.757
2012- 2- 1 15.17 0.757
2012- 2- 2 4.69 0.757
2012- 2- 2 18.21 0.757
2012- 2- 3 7.72 0.757
2012- 2- 3 21.24 0.757
2012- 2- 4 10.76 0.757

Monitoring the system (covering each of the two events twice) in the next lunation will be good; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-11 11.70 0.255
2012- 2-12 1.22 0.255
2012- 2-12 14.73 0.255
2012- 2-13 4.25 0.255
2012- 2-13 17.77 0.255
2012- 2-14 7.29 0.255
2012- 2-14 20.80 0.255
2012- 2-15 10.32 0.255
2012- 2-15 23.84 0.255
2012- 2-16 13.35 0.255
2012- 2-17 2.87 0.255
2012- 2-17 16.39 0.255
2012- 2-18 5.90 0.255
2012- 2-18 19.42 0.255
2012- 2-19 8.94 0.255
2012- 2-19 22.46 0.255
2012- 2-20 11.97 0.255
2012- 2-21 1.49 0.255
2012- 2-21 15.01 0.255
2012- 2-22 4.52 0.255
2012- 2-22 18.04 0.255
2012- 2-23 7.56 0.255
2012- 2-23 21.07 0.255
2012- 2-24 10.59 0.255
2012- 2-25 0.11 0.255
2012- 2-25 13.63 0.255
2012- 2-26 3.14 0.255
2012- 2-26 16.66 0.255
2012- 2-27 6.18 0.255
2012- 2-27 19.69 0.255
2012- 2-28 9.21 0.255
2012- 2-28 22.73 0.255
2012- 2-29 12.24 0.255
2012- 3- 1 1.76 0.255
2012- 3- 1 15.28 0.255
2012- 3- 2 4.80 0.255
2012- 3- 2 18.31 0.255
2012- 3- 3 7.83 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-11 4.96 0.757
2012- 2-11 18.48 0.757
2012- 2-12 8.00 0.757
2012- 2-12 21.51 0.757
2012- 2-13 11.03 0.757
2012- 2-14 0.55 0.757
2012- 2-14 14.06 0.757
2012- 2-15 3.58 0.757
2012- 2-15 17.10 0.757
2012- 2-16 6.61 0.757
2012- 2-16 20.13 0.757
2012- 2-17 9.65 0.757
2012- 2-17 23.17 0.757
2012- 2-18 12.68 0.757
2012- 2-19 2.20 0.757
2012- 2-19 15.72 0.757
2012- 2-20 5.23 0.757
2012- 2-20 18.75 0.757
2012- 2-21 8.27 0.757
2012- 2-21 21.78 0.757
2012- 2-22 11.30 0.757
2012- 2-23 0.82 0.757
2012- 2-23 14.34 0.757
2012- 2-24 3.85 0.757
2012- 2-24 17.37 0.757
2012- 2-25 6.89 0.757
2012- 2-25 20.40 0.757
2012- 2-26 9.92 0.757
2012- 2-26 23.44 0.757
2012- 2-27 12.95 0.757
2012- 2-28 2.47 0.757
2012- 2-28 15.99 0.757
2012- 2-29 5.51 0.757
2012- 2-29 19.02 0.757
2012- 3- 1 8.54 0.757
2012- 3- 1 22.06 0.757
2012- 3- 2 11.57 0.757
2012- 3- 3 1.09 0.757

Clear Skies, Petr [2012-01-31 08:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to observe from ~19:30. Jozef [2012-01-29 19:08, Modra]

· Started this one from NC under excellent conditions at 0200 UT and hope to continue through the 0630 UT 0.250 event until about 1100 UT. Got a run on it last night from 0200-0830 UT containing a 0.250 event at 0328. Joe [2012-01-29 02:38, Dark Sky & PROMPT] Message sent to observers

· Haven't started because of fog. Jozef [2012-01-28 20:11, Modra]

· Planning this one, starting ~19:10UT, although weather is uncertain...Jozef [2012-01-28 19:03, Modra] Message sent to observers

· Observing it from 19:11 UT on Jan.27, 2012. Jozef/Stefan [2012-01-27 21:59, Modra]

· Jim Brinsfield took first three partial nights for this return Mars-crossing binary in its current third apparition. A solution with the period estimates from the 2007 apparition:
http://www.asu.cas.cz/~asteroid/05407_12_porb.png
http://www.asu.cas.cz/~asteroid/05407_12_p1.png
There is an apparent event captured.
Cf. with data from the 2007 apparition:
http://www.asu.cas.cz/~asteroid/5407_a7_longpc.png
http://www.asu.cas.cz/~asteroid/5407_a7_shortpc.png

Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-28 3.47 0.250
2012- 1-28 16.99 0.250
2012- 1-29 6.50 0.250
2012- 1-29 20.02 0.250
2012- 1-30 9.54 0.250
2012- 1-30 23.05 0.250
2012- 1-31 12.57 0.250
2012- 2- 1 2.09 0.250
2012- 2- 1 15.61 0.250
2012- 2- 2 5.12 0.250
2012- 2- 2 18.64 0.250
2012- 2- 3 8.16 0.250
2012- 2- 3 21.67 0.250
2012- 2- 4 11.19 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-27 20.70 0.750
2012- 1-28 10.22 0.750
2012- 1-28 23.74 0.750
2012- 1-29 13.26 0.750
2012- 1-30 2.77 0.750
2012- 1-30 16.29 0.750
2012- 1-31 5.81 0.750
2012- 1-31 19.32 0.750
2012- 2- 1 8.84 0.750
2012- 2- 1 22.36 0.750
2012- 2- 2 11.87 0.750
2012- 2- 3 1.39 0.750
2012- 2- 3 14.91 0.750
2012- 2- 4 4.43 0.750
2012- 2- 4 17.94 0.750

Clear Skies, Petr [2012-01-27 16:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from ~20:15 UT, in variable conditions. Jozef, Stefan. [2012-01-26 20:15, Modra]

· Observed under variable conditions 08:00-13:00UT25
Observed under good conditions 05:00-09:00UT26 [2012-01-26 15:02, Via Capote] Message sent to BinAstPhotSurvey conference

· This one has been done well from Skalnate Pleso (6 nights) and Modra (2 nights). The data allowed to resolve both components:
http://www.asu.cas.cz/~asteroid/5407_a7_all.png
http://www.asu.cas.cz/~asteroid/5407_a7_longpc.png
http://www.asu.cas.cz/~asteroid/5407_a7_shortpc.png
P1 = 2.54873 +/-0.00003 h (syn-sid difference ~0.00011 h)
P2 =13.5168 +/-0.0006 h (syn-sid difference ~0.0031 h)
It is in perfect agreement with periods observed in 1997:
P1 = 2.54879 +/-0.00006 h (0.00010 h)
P2 =13.520 +/-0.001 h (0.003 h).
(Pravec et al., Icarus 181, 63, 2006)
The shallow attenuations 0.05-mag deep are well visible in the recent data. Their interpretation as being mutual events is less certain than in other binary cases, as there is no flat bottom seen, so the events would have to be non-central during the whole apparition from Jan. 15 to Feb. 23. An alternative explanation that it is rotational lightcurve minima of a larger secondary cannot be ruled out. More data in future will be needed to establish this one well. A lower limit on Ds/Dp is 0.21.

The object is fading and it is not likely that we would be able to obtain more useful data in the next lunation, so we
close the campaign on this one now.

Very nice work, Michal, Gabo, Marek, Adrian!

Cheers, Petr [2007-02-26 12:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Taking over from 20:30 UT. Michal [2007-02-23 21:21, SkalnatePleso] [Remove]

· Some foggy weather appeared unexpectedly here - session unsuccessful. Adrian [2007-02-23 20:23, Modra] Message sent to BinAstPhotSurvey conference

· Just an attempt to see one attenuation tonight. The prospects are uncertain due to weather - thin clouds. Adrian [2007-02-23 18:28, Modra]

· This object observed from 17:39 UT to 03:02 UT, February 18/19. Gabo [2007-02-19 03:14, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This object observed from 19:43 UT to 03:06 UT, February 17/18. Gabo [2007-02-18 03:22, SkalnatePleso] [Remove]

· This object observed from 21:50 UT to 02:00 UT, February 14/15. Gabo [2007-02-15 03:21, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Started at 17:30 UT in average condition. Michal [2007-02-11 17:40, SkalnatePleso] [Remove]

· After some initial problems with telescope I start this. My observation tonight can be changed if needed. Adrian [2007-02-09 17:39, Modra] Message sent to BinAstPhotSurvey conference

· Observing from 18:30 UT in average conditions. Michal [2007-01-26 18:47, SkalnatePleso] [Remove]

· Observing from 20:00 UT in good conditions, expecting a long session. Michal [2007-01-15 21:17, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(55913) 1998 FL12 - Paired Asteroid [Add new note]
[Send data to: peter@asu.cas.cz ]
· I observed this on Mar 4, and plan to observe it again on Mar 5.
Don [2022-03-05 00:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Unclear, apparently complex case. Petr [2014-05-12 13:41, Ondrejov]

· Started this one at 00:40 UT.
Don [2014-04-18 01:34, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this at 01:10 UT.
Don [2014-04-10 01:48, Sugarloaf]

· Plan to start this at 01:30. Run of last night ruined by wind.
Don [2014-04-07 01:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this at 02:10 UT in somewhat breezy conditions.
Don [2014-04-06 02:17, Sugarloaf]

· Planning to start a run on this low amplitude object at 01:40 UT.
Don [2014-04-03 00:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start a run on this one at 02:30 UT.
Don [2014-03-24 01:04, Sugarloaf]

· I plan to start this one at 02:40 UT.
Don [2014-03-22 00:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5121) Numazawa (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5097, copied below for your convenience.

Cheers, Petr

(5121) NUMAZAWA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; V. Chiorny, Kharkiv Observatory; and R. Durkee, Shed of Science
South Observatory, Pontotoc, TX, U.S.A., report that photometric observations
taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.70-m
telescope at the Chuguev station of the Kharkiv Observatory in Ukraine, and
a 0.50-m telescope at the Shed of Science South Observatory during 2021
Oct. 20-Dec. 8 reveal that minor planet (5121) is a binary system with an
orbital period of 17.18 Â± 0.01 hr. The primary shows a period of 2.6646
Â± 0.0002 hr and has a lightcurve amplitude of 0.13 magnitude at solar
phases 6-9 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.07 to 0.14 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.26.

2022 February 14 (CBET 5097) Daniel W. E. Green [2022-02-14 10:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/05121_2021a_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021a_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021b_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021b_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021c_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021c_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021d_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021d_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021e_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021e_p1.png

Last data (with errors <= 0.015 mag) would be useful to take to monitor the evolving events, before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2022- 1-21 13.81 0.242
2022- 1-22 6.99 0.242
2022- 1-23 0.17 0.242
2022- 1-23 17.35 0.242
2022- 1-24 10.53 0.242
2022- 1-25 3.71 0.242
2022- 1-25 20.89 0.242
2022- 1-26 14.07 0.242
2022- 1-27 7.25 0.242
2022- 1-28 0.43 0.242
2022- 1-28 17.61 0.242
2022- 1-29 10.79 0.242
2022- 1-30 3.97 0.242
2022- 1-30 21.15 0.242
2022- 1-31 14.33 0.242
2022- 2- 1 7.51 0.242
2022- 2- 2 0.69 0.242
2022- 2- 2 17.87 0.242
2022- 2- 3 11.05 0.242
2022- 2- 4 4.23 0.242
2022- 2- 4 21.41 0.242
2022- 2- 5 14.59 0.242
2022- 2- 6 7.77 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2022- 1-21 5.16 0.739
2022- 1-21 22.34 0.739
2022- 1-22 15.52 0.739
2022- 1-23 8.70 0.739
2022- 1-24 1.88 0.739
2022- 1-24 19.06 0.739
2022- 1-25 12.24 0.739
2022- 1-26 5.42 0.739
2022- 1-26 22.60 0.739
2022- 1-27 15.78 0.739
2022- 1-28 8.96 0.739
2022- 1-29 2.14 0.739
2022- 1-29 19.32 0.739
2022- 1-30 12.50 0.739
2022- 1-31 5.68 0.739
2022- 1-31 22.86 0.739
2022- 2- 1 16.04 0.739
2022- 2- 2 9.22 0.739
2022- 2- 3 2.40 0.739
2022- 2- 3 19.58 0.739
2022- 2- 4 12.76 0.739
2022- 2- 5 5.94 0.739
2022- 2- 5 23.12 0.739
2022- 2- 6 16.30 0.739

Clear Skies, Petr [2022-01-12 09:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will try a run on this one tonight.

Russ [2021-12-23 01:55, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/05121_2021a_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021a_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021b_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021b_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021c_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021c_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021d_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021d_p1.png

The events are evolving, so more high-quality (errors not greater than 0.015 mag; don't bother in less ideal conditions) are needed before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-12-22 12.03 0.230
2021-12-23 5.21 0.230
2021-12-23 22.39 0.230
2021-12-24 15.57 0.230
2021-12-25 8.75 0.230
2021-12-26 1.93 0.230
2021-12-26 19.11 0.230
2021-12-27 12.29 0.230
2021-12-28 5.47 0.230
2021-12-28 22.65 0.230
2021-12-29 15.83 0.230
2021-12-30 9.01 0.230
2021-12-31 2.19 0.230
2021-12-31 19.37 0.230
2022- 1- 1 12.55 0.230
2022- 1- 2 5.73 0.230
2022- 1- 2 22.91 0.230
2022- 1- 3 16.09 0.230
2022- 1- 4 9.27 0.230
2022- 1- 5 2.45 0.230
2022- 1- 5 19.63 0.230
2022- 1- 6 12.81 0.230
2022- 1- 7 5.99 0.230
2022- 1- 7 23.17 0.230
2022- 1- 8 16.35 0.230
2022- 1- 9 9.53 0.230

Date/Time UTC (LTc.) Phase
--------------------------
2021-12-22 3.58 0.738
2021-12-22 20.76 0.738
2021-12-23 13.94 0.738
2021-12-24 7.12 0.738
2021-12-25 0.30 0.738
2021-12-25 17.48 0.738
2021-12-26 10.66 0.738
2021-12-27 3.84 0.738
2021-12-27 21.02 0.738
2021-12-28 14.20 0.738
2021-12-29 7.38 0.738
2021-12-30 0.56 0.738
2021-12-30 17.74 0.738
2021-12-31 10.92 0.738
2022- 1- 1 4.10 0.738
2022- 1- 1 21.28 0.738
2022- 1- 2 14.46 0.738
2022- 1- 3 7.64 0.738
2022- 1- 4 0.82 0.738
2022- 1- 4 18.00 0.738
2022- 1- 5 11.18 0.738
2022- 1- 6 4.36 0.738
2022- 1- 6 21.54 0.738
2022- 1- 7 14.72 0.738
2022- 1- 8 7.90 0.738
2022- 1- 9 1.08 0.738
2022- 1- 9 18.26 0.738

Clear Skies, Petr [2021-12-13 11:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this one.
Russ [2021-12-07 03:54, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/05121_2021a_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021a_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021b_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021b_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021c_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021c_p1.png

More high-quality (errors 0.01 mag; don't bother in less ideal conditions) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-11-23 3.61 0.250
2021-11-23 20.78 0.250
2021-11-24 13.95 0.250
2021-11-25 7.12 0.250
2021-11-26 0.29 0.250
2021-11-26 17.46 0.250
2021-11-27 10.63 0.250
2021-11-28 3.80 0.250
2021-11-28 20.97 0.250
2021-11-29 14.14 0.250
2021-11-30 7.31 0.250
2021-12- 1 0.48 0.250
2021-12- 1 17.65 0.250
2021-12- 2 10.82 0.250
2021-12- 3 3.99 0.250
2021-12- 3 21.16 0.250
2021-12- 4 14.33 0.250
2021-12- 5 7.50 0.250
2021-12- 6 0.67 0.250
2021-12- 6 17.84 0.250
2021-12- 7 11.01 0.250
2021-12- 8 4.18 0.250
2021-12- 8 21.35 0.250
2021-12- 9 14.52 0.250
2021-12-10 7.69 0.250
2021-12-11 0.86 0.250
2021-12-11 18.03 0.250
2021-12-12 11.20 0.250
2021-12-13 4.37 0.250
2021-12-13 21.54 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021-11-23 12.18 0.750
2021-11-24 5.35 0.750
2021-11-24 22.52 0.750
2021-11-25 15.69 0.750
2021-11-26 8.86 0.750
2021-11-27 2.03 0.750
2021-11-27 19.20 0.750
2021-11-28 12.37 0.750
2021-11-29 5.54 0.750
2021-11-29 22.71 0.750
2021-11-30 15.88 0.750
2021-12- 1 9.05 0.750
2021-12- 2 2.22 0.750
2021-12- 2 19.39 0.750
2021-12- 3 12.56 0.750
2021-12- 4 5.73 0.750
2021-12- 4 22.90 0.750
2021-12- 5 16.07 0.750
2021-12- 6 9.24 0.750
2021-12- 7 2.41 0.750
2021-12- 7 19.58 0.750
2021-12- 8 12.75 0.750
2021-12- 9 5.92 0.750
2021-12- 9 23.09 0.750
2021-12-10 16.26 0.750
2021-12-11 9.43 0.750
2021-12-12 2.60 0.750
2021-12-12 19.77 0.750
2021-12-13 12.94 0.750

Clear Skies, Petr [2021-11-17 13:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed last night on 13/14 Nov to capture 0.253 event.
Vasilij Ch. [2021-11-14 10:36, Kharkiv] Message sent to observers

· New data by Vladimir Benishek joined in. As I suspected, the preliminary solution was not good; a revised one:
http://www.asu.cas.cz/~asteroid/05121_2021a_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021a_p1.png
http://www.asu.cas.cz/~asteroid/05121_2021b_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021b_p1.png

More data are needed to nail down it. High-quality data (errors 0.01 mag) are needed; don't bother in less ideal conditions. Event ephemeris for the current solution (but don't confine your observations too closely around the predicted mid-event times, the solution is still not great):

Date/Time UTC (LTc.) Phase
--------------------------
2021-11- 3 2.53 0.253
2021-11- 3 19.71 0.253
2021-11- 4 12.89 0.253
2021-11- 5 6.07 0.253
2021-11- 5 23.25 0.253
2021-11- 6 16.43 0.253
2021-11- 7 9.61 0.253
2021-11- 8 2.79 0.253
2021-11- 8 19.97 0.253
2021-11- 9 13.15 0.253
2021-11-10 6.33 0.253
2021-11-10 23.51 0.253
2021-11-11 16.69 0.253
2021-11-12 9.87 0.253
2021-11-13 3.05 0.253
2021-11-13 20.23 0.253
2021-11-14 13.41 0.253
2021-11-15 6.59 0.253
2021-11-15 23.77 0.253
2021-11-16 16.95 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2021-11- 2 17.93 0.753
2021-11- 3 11.11 0.753
2021-11- 4 4.29 0.753
2021-11- 4 21.47 0.753
2021-11- 5 14.65 0.753
2021-11- 6 7.83 0.753
2021-11- 7 1.01 0.753
2021-11- 7 18.19 0.753
2021-11- 8 11.37 0.753
2021-11- 9 4.55 0.753
2021-11- 9 21.73 0.753
2021-11-10 14.91 0.753
2021-11-11 8.09 0.753
2021-11-12 1.27 0.753
2021-11-12 18.45 0.753
2021-11-13 11.63 0.753
2021-11-14 4.81 0.753
2021-11-14 21.99 0.753
2021-11-15 15.17 0.753
2021-11-16 8.35 0.753

Clear Skies, Petr [2021-11-02 13:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vasilij Chiorny observed this binary candidate on 2021-10-30.9, covered a part of event. Following solution is still somewhat tentative:
http://www.asu.cas.cz/~asteroid/05121_2021a_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021a_p1.png

More data are needed to establish it well. High-quality data (errors 0.01 mag) are needed; don't bother in less ideal conditions. Tentative event ephemeris (but don't confine your observations too closely around the predicted mid-event times, the ephemeris is not very reliable):

Date/Time UTC (LTc.) Phase
--------------------------
2021-11- 2 22.77 0.241
2021-11- 3 17.21 0.241
2021-11- 4 11.65 0.241
2021-11- 5 6.09 0.241
2021-11- 6 0.53 0.241
2021-11- 6 18.97 0.241
2021-11- 7 13.41 0.241
2021-11- 8 7.85 0.241
2021-11- 9 2.29 0.241
2021-11- 9 20.73 0.241
2021-11-10 15.17 0.241
2021-11-11 9.61 0.241
2021-11-12 4.05 0.241
2021-11-12 22.49 0.241
2021-11-13 16.93 0.241
2021-11-14 11.37 0.241
2021-11-15 5.81 0.241
2021-11-16 0.25 0.241
2021-11-16 18.69 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2021-11- 2 13.54 0.741
2021-11- 3 7.98 0.741
2021-11- 4 2.42 0.741
2021-11- 4 20.86 0.741
2021-11- 5 15.30 0.741
2021-11- 6 9.74 0.741
2021-11- 7 4.18 0.741
2021-11- 7 22.62 0.741
2021-11- 8 17.06 0.741
2021-11- 9 11.50 0.741
2021-11-10 5.94 0.741
2021-11-11 0.38 0.741
2021-11-11 18.82 0.741
2021-11-12 13.26 0.741
2021-11-13 7.70 0.741
2021-11-14 2.14 0.741
2021-11-14 20.58 0.741
2021-11-15 15.02 0.741
2021-11-16 9.46 0.741

Clear Skies, Petr [2021-11-02 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot on the past two nights, found it to be a binary candidate. A tentative solution:
http://www.asu.cas.cz/~asteroid/05121_2021a_porb.png
http://www.asu.cas.cz/~asteroid/05121_2021a_p1.png

More data (after the Moon is out of the way) are needed to nail it down. High-quality data (errors 0.01 mag) are needed; don't bother in less ideal conditions. Tentative event ephemeris (but it may be wrong so don't confine your observations too closely around the predicted mid-event times):

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-27 0.60 0.250
2021-10-27 19.00 0.250
2021-10-28 13.40 0.250
2021-10-29 7.80 0.250
2021-10-30 2.20 0.250
2021-10-30 20.60 0.250
2021-10-31 15.00 0.250
2021-11- 1 9.40 0.250
2021-11- 2 3.80 0.250
2021-11- 2 22.20 0.250
2021-11- 3 16.60 0.250
2021-11- 4 11.00 0.250
2021-11- 5 5.40 0.250
2021-11- 5 23.80 0.250
2021-11- 6 18.20 0.250
2021-11- 7 12.60 0.250
2021-11- 8 7.00 0.250
2021-11- 9 1.40 0.250
2021-11- 9 19.80 0.250
2021-11-10 14.20 0.250
2021-11-11 8.60 0.250
2021-11-12 3.00 0.250
2021-11-12 21.40 0.250
2021-11-13 15.80 0.250
2021-11-14 10.20 0.250
2021-11-15 4.60 0.250
2021-11-15 23.00 0.250
2021-11-16 17.40 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-27 9.80 0.750
2021-10-28 4.20 0.750
2021-10-28 22.60 0.750
2021-10-29 17.00 0.750
2021-10-30 11.40 0.750
2021-10-31 5.80 0.750
2021-11- 1 0.20 0.750
2021-11- 1 18.60 0.750
2021-11- 2 13.00 0.750
2021-11- 3 7.40 0.750
2021-11- 4 1.80 0.750
2021-11- 4 20.20 0.750
2021-11- 5 14.60 0.750
2021-11- 6 9.00 0.750
2021-11- 7 3.40 0.750
2021-11- 7 21.80 0.750
2021-11- 8 16.20 0.750
2021-11- 9 10.60 0.750
2021-11-10 5.00 0.750
2021-11-10 23.40 0.750
2021-11-11 17.80 0.750
2021-11-12 12.20 0.750
2021-11-13 6.60 0.750
2021-11-14 1.00 0.750
2021-11-14 19.40 0.750
2021-11-15 13.80 0.750
2021-11-16 8.20 0.750

Clear Skies, Petr [2021-10-21 12:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Worked this new target last night (Oct. 19-20 UT) and also for the second time tonight (Oct. 20-21 UT).
Vladimir [2021-10-20 23:19, Sopot AO]

(4935) Maslachkova (Finished) - prime suspect [Add new note]
· Only marginal coverage for this "prime suspect" obtained in this apparition; closing it. Petr [2021-12-14 11:33, Ondrejov]

· Doing a run on this at 22:45, Dec 12 UT.
Don [2021-12-12 22:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I've done several runs on this during Nov.
Don [2021-12-01 02:49, Sugarloaf]

· David Higgins took three full nights for this return "prime suspect": Unique solution, multiple coverage, no significant deviation,
http://www.david-higgins.com/Astronomy/asteroid/results/output/4935.htm
Very similar to the 2008 Modra observations:
http://www.asu.cas.cz/~asteroid/04935.png
Done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good, clean work, David.

Cheers, Petr [2011-09-09 08:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2011 08 23 and 24 in reasonable - good conditions. Data reveals a period of 2.90197h +/- 0.00007h with an amplitude of 0.23mag +/- 0.02mag with no deviations detected. [2011-08-24 22:17, HuntersHill] Message sent to observers

· Observed 20110804 from 1225UT to 2006UT in good conditions. Dtaa reveals a period of 2.89h+/- 0.02h with an amplitude of 0.25+/- 0.02mag. No deviations detected. [2011-08-04 22:33, HuntersHill] Message sent to BinAstPhotSurvey conference

· Four nights by Jozef, Leos, and Stefan from Modra: Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/04935.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-11-20 09:47, Ondrejov] Message sent to observers

· It seems the sky is clearing out, we plan to do this one tonight starting at ~18:30 UT. Jozef, Leos. [2008-11-17 16:55, Modra] Message sent to BinAstPhotSurvey conference

· Jozef and Leos taken one night from Modra, covered what appears to be nearly two rotation cycles (period 2.91 h), but there is apparent a drop at the beginning of the sessions that needs to be confirmed with more observations. I encourage others to help out after the moon is out of the way.
http://www.asu.cas.cz/~asteroid/04935.png

Clear Skies, Petr [2008-11-12 13:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 19:20 UT on Nov.10, 2008, under moonlight and some clouds.

Stefan [2008-11-10 22:48, Modra]

· Covering ~5.5h the curve showed 4 minima/maxima with an amplitude ~0.2mag. Estimated period of rotation (assuming single periodicity) is ~2.9h. Jozef, Leos. [2008-11-06 11:31, Modra]

· Observing from 19:50 UT. Jozef, Leos. [2008-11-05 19:55, Modra]

(2847) Parvati (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5083, copied below for your convenience.

Cheers, Petr

(2847) PARVATI
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; B. Warner, Center for Solar System Studies, Landers, CA, U.S.A.;
R. Durkee, Shed of Science South Observatory (SSSO), Pontotoc, TX, U.S.A.; R.
Goncalves, Instituto Politecnico de Tomar (IPT), Portugal; and F. Pilcher,
Organ Mesa Observatory, Las Cruces, NM, U.S.A., report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia,
a 0.35-m telescope at the Center for Solar System Studies, a 0.50-m telescope
at the SSSO, a 0.35-m telescope at the IPT's Linhaceira Observatory, and a
0.35-m telescope at the Organ Mesa Observatory during Sept. 3-Nov. 25 reveal
that minor planet (2847) is a binary system with an orbital period of 23.764
Â± 0.007 hr. The primary shows a period of 2.6358 Â± 0.0002 hr and has a
lightcurve amplitude of 0.09 magnitude at solar phases 3-10 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.06 to 0.12 magnitude deep indicate a secondary-to-primary mean-diameter
ratio of 0.24 Â± 0.02. The secondary appears synchronous and has a light-
curve amplitude (combined primary-plus-secondary light curve) of 0.03 mag,
suggesting an elongated shape with an equatorial-axis ratio of 1.5 Â± 0.3.

2021 December 10 (CBET 5083) Daniel W. E. Green [2021-12-13 10:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/02847_2021a_porb.png
http://www.asu.cas.cz/~asteroid/02847_2021a_p1.png
http://www.asu.cas.cz/~asteroid/02847_2021b_porb.png
http://www.asu.cas.cz/~asteroid/02847_2021b_p1.png
http://www.asu.cas.cz/~asteroid/02847_2021c_porb.png
http://www.asu.cas.cz/~asteroid/02847_2021c_p1.png

Last high-quality data (errors 0.01 mag; don't bother in less ideal conditions) would be useful to improve the solution. We will publish it on CBET then. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-11-22 16.26 0.260
2021-11-23 16.02 0.260
2021-11-24 15.78 0.260
2021-11-25 15.54 0.260
2021-11-26 15.30 0.260
2021-11-27 15.06 0.260
2021-11-28 14.82 0.260
2021-11-29 14.58 0.260
2021-11-30 14.34 0.260
2021-12- 1 14.10 0.260
2021-12- 2 13.86 0.260
2021-12- 3 13.62 0.260
2021-12- 4 13.38 0.260
2021-12- 5 13.14 0.260
2021-12- 6 12.90 0.260
2021-12- 7 12.66 0.260
2021-12- 8 12.42 0.260
2021-12- 9 12.18 0.260
2021-12-10 11.94 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2021-11-23 4.15 0.760
2021-11-24 3.91 0.760
2021-11-25 3.67 0.760
2021-11-26 3.43 0.760
2021-11-27 3.19 0.760
2021-11-28 2.95 0.760
2021-11-29 2.71 0.760
2021-11-30 2.47 0.760
2021-12- 1 2.23 0.760
2021-12- 2 1.99 0.760
2021-12- 3 1.75 0.760
2021-12- 4 1.51 0.760
2021-12- 5 1.27 0.760
2021-12- 6 1.03 0.760
2021-12- 7 0.79 0.760
2021-12- 8 0.55 0.760
2021-12- 9 0.31 0.760
2021-12-10 0.07 0.760

Clear Skies, Petr [2021-11-16 07:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will cover this one tonight for the 0.755 event.

Russ [2021-11-12 02:21, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/02847_2021a_porb.png
http://www.asu.cas.cz/~asteroid/02847_2021a_p1.png
http://www.asu.cas.cz/~asteroid/02847_2021b_porb.png
http://www.asu.cas.cz/~asteroid/02847_2021b_p1.png

More high-quality data (errors 0.01 mag; don't bother in less ideal conditions) would be useful to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-24 23.10 0.255
2021-10-25 22.86 0.255
2021-10-26 22.62 0.255
2021-10-27 22.38 0.255
2021-10-28 22.14 0.255
2021-10-29 21.90 0.255
2021-10-30 21.66 0.255
2021-10-31 21.42 0.255
2021-11- 1 21.18 0.255
2021-11- 2 20.94 0.255
2021-11- 3 20.70 0.255
2021-11- 4 20.46 0.255
2021-11- 5 20.22 0.255
2021-11- 6 19.98 0.255
2021-11- 7 19.74 0.255
2021-11- 8 19.50 0.255
2021-11- 9 19.26 0.255
2021-11-10 19.02 0.255
2021-11-11 18.78 0.255
2021-11-12 18.54 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-24 11.21 0.755
2021-10-25 10.97 0.755
2021-10-26 10.73 0.755
2021-10-27 10.49 0.755
2021-10-28 10.25 0.755
2021-10-29 10.01 0.755
2021-10-30 9.77 0.755
2021-10-31 9.53 0.755
2021-11- 1 9.29 0.755
2021-11- 2 9.05 0.755
2021-11- 3 8.81 0.755
2021-11- 4 8.57 0.755
2021-11- 5 8.33 0.755
2021-11- 6 8.09 0.755
2021-11- 7 7.85 0.755
2021-11- 8 7.61 0.755
2021-11- 9 7.37 0.755
2021-11-10 7.13 0.755
2021-11-11 6.89 0.755
2021-11-12 6.65 0.755

Clear Skies, Petr [2021-10-19 09:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.

Russ [2021-10-15 02:14, Shed of Science] Message sent to observers

· Doing a run on this again tonight.

Russ [2021-10-08 02:48, Shed of Science]

· Starting a run on this tonight.

Russ [2021-10-07 01:37, Shed of Science] Message sent to observers

· Vladimir Benishek has observed this off-list target from Sopot, supported by Brian Warner and Frederick Pilcher. It is clearly a binary, though the solution has been complicated by that its orbit period is close to 24 hours. However, now we have got what appears to be a good solution:
http://www.asu.cas.cz/~asteroid/02847_2021a_porb.png
http://www.asu.cas.cz/~asteroid/02847_2021a_p1.png
http://www.asu.cas.cz/~asteroid/02847_2021b_porb.png
http://www.asu.cas.cz/~asteroid/02847_2021b_p1.png

More high-quality data (errors 0.01 mag; don't bother in less ideal conditions) are needed to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-10- 7 3.47 0.257
2021-10- 8 3.23 0.257
2021-10- 9 2.99 0.257
2021-10-10 2.75 0.257
2021-10-11 2.51 0.257
2021-10-12 2.27 0.257
2021-10-13 2.03 0.257
2021-10-14 1.79 0.257
2021-10-15 1.55 0.257
2021-10-16 1.31 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2021-10- 6 15.53 0.755
2021-10- 7 15.29 0.755
2021-10- 8 15.05 0.755
2021-10- 9 14.81 0.755
2021-10-10 14.57 0.755
2021-10-11 14.33 0.755
2021-10-12 14.09 0.755
2021-10-13 13.85 0.755
2021-10-14 13.61 0.755
2021-10-15 13.37 0.755
2021-10-16 13.13 0.755

Clear Skies, Petr [2021-10-06 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Inconclusive solution, more data needed in a future apparition. Petr [2020-05-31 09:04, Ondrejov]

· Vladimir Benishek took two more nights for this one. Solution is still not unique; following one is somewhat more likely than others:
http://www.asu.cas.cz/~asteroid/02847_2020a_porb.png
http://www.asu.cas.cz/~asteroid/02847_2020a_p1.png
But an orbit period of 47.52 h is almost as likely. Following event ephemeris is for the 15.84-h period, but don't limit your observations just to the predicted times as the solution may be wrong. (And for the period of 47.52-h, only one third of the predicted events below will occur.) Data with errors < 0.02 mag are needed; don't bother in less ideal conditions.

Date/Time UTC (LTc.) Phase
--------------------------
2020- 5-11 10.42 0.264
2020- 5-12 2.26 0.264
2020- 5-12 18.10 0.264
2020- 5-13 9.94 0.264
2020- 5-14 1.78 0.264
2020- 5-14 17.62 0.264
2020- 5-15 9.46 0.264
2020- 5-16 1.30 0.264
2020- 5-16 17.14 0.264
2020- 5-17 8.98 0.264
2020- 5-18 0.82 0.264
2020- 5-18 16.66 0.264
2020- 5-19 8.50 0.264
2020- 5-20 0.34 0.264
2020- 5-20 16.18 0.264
2020- 5-21 8.02 0.264
2020- 5-21 23.86 0.264
2020- 5-22 15.70 0.264
2020- 5-23 7.54 0.264
2020- 5-23 23.38 0.264
2020- 5-24 15.22 0.264
2020- 5-25 7.06 0.264
2020- 5-25 22.90 0.264
2020- 5-26 14.74 0.264
2020- 5-27 6.58 0.264
2020- 5-27 22.42 0.264
2020- 5-28 14.26 0.264

Date/Time UTC (LTc.) Phase
--------------------------
2020- 5-11 18.38 0.766
2020- 5-12 10.22 0.766
2020- 5-13 2.06 0.766
2020- 5-13 17.90 0.766
2020- 5-14 9.74 0.766
2020- 5-15 1.58 0.766
2020- 5-15 17.42 0.766
2020- 5-16 9.26 0.766
2020- 5-17 1.10 0.766
2020- 5-17 16.94 0.766
2020- 5-18 8.78 0.766
2020- 5-19 0.62 0.766
2020- 5-19 16.46 0.766
2020- 5-20 8.30 0.766
2020- 5-21 0.14 0.766
2020- 5-21 15.98 0.766
2020- 5-22 7.82 0.766
2020- 5-22 23.66 0.766
2020- 5-23 15.50 0.766
2020- 5-24 7.34 0.766
2020- 5-24 23.18 0.766
2020- 5-25 15.02 0.766
2020- 5-26 6.86 0.766
2020- 5-26 22.70 0.766
2020- 5-27 14.54 0.766
2020- 5-28 6.38 0.766
2020- 5-28 22.22 0.766

Clear Skies, Petr [2020-05-11 07:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. A tentative lc decomposition (but it may be wrong):
http://www.asu.cas.cz/~asteroid/02847_2020a_porb.png
http://www.asu.cas.cz/~asteroid/02847_2020a_p1.png

Vladimir would appreciate a help by others here. Data with errors < 0.02 mag will be needed; don't bother in less ideal conditions.

Clear Skies, Petr [2020-05-04 10:22, Ondrejov] Message sent to BinAstPhotSurvey conference

(88259) 2001 HJ7 - Paired Asteroid [Add new note]
[Send data to: peter@asu.cas.cz ]
· Starting this one at 23:45, Dec 12 UT.
Don [2021-12-12 22:42, Sugarloaf] Message sent to observers

· I started this at about 00:00, Dec 4 UT.
Don [2021-12-04 00:13, Sugarloaf]

· Starting a run on this one tonight. [2021-12-03 02:22, Shed of Science]

· Starting this one tonight.

Russ [2021-11-30 01:55, Shed of Science] Message sent to observers

· Planning to start this at 00:10, Nov 30 UT.
Don [2021-11-29 21:57, Sugarloaf]

· Starting this one tonight.

Russ [2021-11-29 03:00, Shed of Science]

· I'm starting this one at 00:45 UT and hope to get ~5 hours on it before clouds arrive.
Don [2021-11-27 23:08, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight. Clouds my interfere.
Don [2021-11-25 00:55, Sugarloaf]

· I've done several runs on this through Nov. Doing another session tonight, Nov. 24, UT.

Don [2021-11-24 00:47, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This paired asteroid was done by Brian Warner from PDO, by Joe Pollock with PROMPT, and by Don Pray from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/088259_1206.png
http://www.asu.cas.cz/~asteroid/088259_1205.png
Cf. with data by Adrian Galad with CTIO 1.0-m from 2009:
http://www.asu.cas.cz/~asteroid/088259.png

Cheers, Petr [2012-07-01 08:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:50 UT.
Don [2012-06-29 01:50, Sugarloaf]

· Started a run at 01:40 UT. Looks like it could be a slow rotator.
Don [2012-06-24 02:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 1:50 UT.
Don [2012-06-22 03:04, Sugarloaf]

· Starting this new target at 02:40 UT.
Doing 5953 as secondary.
Don [2012-06-21 03:16, Sugarloaf] Message sent to BinAstPhotSurvey conference

(37424) 2001 YA3 (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5081, copied below for your convenience.

Cheers, Petr

(37424) 2001 YA_3
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; P. Sogorb, La Bastide des Jourdans, France; and R. Durkee, Shed
of Science South Observatory (SSSO), Pontotoc, TX, U.S.A., report that
photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.28-m telescope at the Bastidan Observatory in
France, and a 0.50-m telescope at the SSSO during Sept. 26-Nov. 7 reveal that
minor planet (37424) is a binary system with an orbital period of 18.956 Â±
0.006 hr. The primary shows a period of 2.8251 Â± 0.0002 hr and has a
lightcurve amplitude of 0.11 magnitude at solar phases 6-9 degrees, suggesting
a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.05
magnitude deep indicate a lower limit on the secondary-to-primary mean-
diameter ratio of 0.22. SSSO observations taken on Nov. 7 showed a 0.07-mag-
deep brightness attenuation centered at Nov. 7.3069 UT and lasting for 35 min
that was not phased to the 0.05-mag-deep mutual events repeating with the
18.956-hr period above; the suspicion that it was a mutual event by a second
satellite needs to be confirmed with future observations.

2021 December 9 (CBET 5081) Daniel W. E. Green [2021-12-10 07:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· New observations by Russ Durkee have improved the solution, but on the last night he also catched what appears to be another event, not linked to the ones repeating with the 18.955-h period. A second satellite perhaps? Confirmation is needed.
http://www.asu.cas.cz/~asteroid/37424_2021a_porb.png
http://www.asu.cas.cz/~asteroid/37424_2021a_p1.png
http://www.asu.cas.cz/~asteroid/37424_2021b_porb.png
http://www.asu.cas.cz/~asteroid/37424_2021b_p1.png

More high-quality data (errors < 0.015 mag; don't bother in less ideal conditions) are needed. Event ephemeris (but take data at any time as the suspected second satellite has a different period):

Date/Time UTC (LTc.) Phase
--------------------------
2021-11-22 21.29 0.254
2021-11-23 16.25 0.254
2021-11-24 11.20 0.254
2021-11-25 6.16 0.254
2021-11-26 1.11 0.254
2021-11-26 20.07 0.254
2021-11-27 15.02 0.254
2021-11-28 9.98 0.254
2021-11-29 4.93 0.254
2021-11-29 23.89 0.254
2021-11-30 18.84 0.254
2021-12- 1 13.80 0.254
2021-12- 2 8.75 0.254
2021-12- 3 3.71 0.254
2021-12- 3 22.66 0.254
2021-12- 4 17.62 0.254
2021-12- 5 12.57 0.254
2021-12- 6 7.53 0.254
2021-12- 7 2.48 0.254
2021-12- 7 21.44 0.254
2021-12- 8 16.39 0.254
2021-12- 9 11.35 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2021-11-23 6.76 0.754
2021-11-24 1.72 0.754
2021-11-24 20.67 0.754
2021-11-25 15.63 0.754
2021-11-26 10.58 0.754
2021-11-27 5.54 0.754
2021-11-28 0.49 0.754
2021-11-28 19.45 0.754
2021-11-29 14.40 0.754
2021-11-30 9.36 0.754
2021-12- 1 4.31 0.754
2021-12- 1 23.27 0.754
2021-12- 2 18.22 0.754
2021-12- 3 13.18 0.754
2021-12- 4 8.13 0.754
2021-12- 5 3.09 0.754
2021-12- 5 22.04 0.754
2021-12- 6 17.00 0.754
2021-12- 7 11.95 0.754
2021-12- 8 6.91 0.754
2021-12- 9 1.86 0.754
2021-12- 9 20.82 0.754

Clear Skies, Petr [2021-11-16 09:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this one tonight.

Russ [2021-11-07 02:41, Shed of Science] Message sent to observers

· Starting a run on this one tonight for remeasuring primary lc

Russ [2021-10-31 01:36, Shed of Science]

· I am going to try this one tonight to cover the 0.75 event.

Russ [2021-10-28 02:57, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/37424_2021a_porb.png
http://www.asu.cas.cz/~asteroid/37424_2021a_p1.png

More high-quality data (errors < 0.015 mag; don't bother in less ideal conditions) would be useful to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-24 15.83 0.255
2021-10-25 10.78 0.255
2021-10-26 5.73 0.255
2021-10-27 0.68 0.255
2021-10-27 19.63 0.255
2021-10-28 14.58 0.255
2021-10-29 9.53 0.255
2021-10-30 4.48 0.255
2021-10-30 23.43 0.255
2021-10-31 18.38 0.255
2021-11- 1 13.33 0.255
2021-11- 2 8.28 0.255
2021-11- 3 3.23 0.255
2021-11- 3 22.18 0.255
2021-11- 4 17.13 0.255
2021-11- 5 12.08 0.255
2021-11- 6 7.03 0.255
2021-11- 7 1.98 0.255
2021-11- 7 20.93 0.255
2021-11- 8 15.88 0.255
2021-11- 9 10.83 0.255
2021-11-10 5.78 0.255
2021-11-11 0.73 0.255
2021-11-11 19.68 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-24 6.41 0.758
2021-10-25 1.36 0.758
2021-10-25 20.31 0.758
2021-10-26 15.26 0.758
2021-10-27 10.21 0.758
2021-10-28 5.16 0.758
2021-10-29 0.11 0.758
2021-10-29 19.06 0.758
2021-10-30 14.01 0.758
2021-10-31 8.96 0.758
2021-11- 1 3.91 0.758
2021-11- 1 22.86 0.758
2021-11- 2 17.81 0.758
2021-11- 3 12.76 0.758
2021-11- 4 7.71 0.758
2021-11- 5 2.66 0.758
2021-11- 5 21.61 0.758
2021-11- 6 16.56 0.758
2021-11- 7 11.51 0.758
2021-11- 8 6.46 0.758
2021-11- 9 1.41 0.758
2021-11- 9 20.36 0.758
2021-11-10 15.31 0.758
2021-11-11 10.26 0.758

Clear Skies, Petr [2021-10-19 09:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will try to cover the 0.75 event tonight.

Russ [2021-10-10 00:56, Shed of Science] Message sent to observers

· Vladimir has covered the primary event again. A likely solution:
http://www.asu.cas.cz/~asteroid/37424_2021a_porb.png
http://www.asu.cas.cz/~asteroid/37424_2021a_p1.png

More data (errors < 0.02 mag; don't bother in less ideal conditions) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-10- 6 12.05 0.253
2021-10- 7 7.02 0.253
2021-10- 8 1.99 0.253
2021-10- 8 20.96 0.253
2021-10- 9 15.93 0.253
2021-10-10 10.90 0.253
2021-10-11 5.87 0.253
2021-10-12 0.84 0.253
2021-10-12 19.81 0.253
2021-10-13 14.78 0.253
2021-10-14 9.75 0.253
2021-10-15 4.72 0.253
2021-10-15 23.69 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2021-10- 6 21.53 0.753
2021-10- 7 16.50 0.753
2021-10- 8 11.47 0.753
2021-10- 9 6.44 0.753
2021-10-10 1.41 0.753
2021-10-10 20.38 0.753
2021-10-11 15.35 0.753
2021-10-12 10.32 0.753
2021-10-13 5.29 0.753
2021-10-14 0.26 0.753
2021-10-14 19.23 0.753
2021-10-15 14.20 0.753

Clear Skies, Petr [2021-10-06 07:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. A tentative solution:
http://www.asu.cas.cz/~asteroid/37424_2021a_porb.png
http://www.asu.cas.cz/~asteroid/37424_2021a_p1.png

More data are needed to nail it down. Errors < 0.02 mag are needed; don't bother in less ideal conditions. Tentative event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-10- 4 21.83 0.250
2021-10- 5 16.73 0.250
2021-10- 6 11.63 0.250
2021-10- 7 6.53 0.250
2021-10- 8 1.43 0.250
2021-10- 8 20.33 0.250
2021-10- 9 15.23 0.250
2021-10-10 10.13 0.250
2021-10-11 5.03 0.250
2021-10-11 23.93 0.250
2021-10-12 18.83 0.250
2021-10-13 13.73 0.250
2021-10-14 8.63 0.250
2021-10-15 3.53 0.250
2021-10-15 22.43 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021-10- 5 7.27 0.750
2021-10- 6 2.17 0.750
2021-10- 6 21.07 0.750
2021-10- 7 15.97 0.750
2021-10- 8 10.87 0.750
2021-10- 9 5.77 0.750
2021-10-10 0.67 0.750
2021-10-10 19.57 0.750
2021-10-11 14.47 0.750
2021-10-12 9.37 0.750
2021-10-13 4.27 0.750
2021-10-13 23.17 0.750
2021-10-14 18.07 0.750
2021-10-15 12.97 0.750

Clear Skies, Petr [2021-10-04 12:44, Ondrejov] Message sent to BinAstPhotSurvey conference

(3680) Sasha (Finished) - prime suspect [Add new note]
· Done for the 3rd apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-12-01 09:36, Ondrejov]

· I've done several runs on this one during Oct and Nov., and oing another tonight, Nov. 24, UT.
Don [2021-11-24 00:51, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Russ Durkee observed this object from Shed of Science South in its 2nd apparition: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03680_b9.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-25 07:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started about 3UT will run until 9UT on 1/13

Russ [2019-01-13 04:36, Shed of Science] Message sent to observers

· Will start about 3UT and run until about 9UT on 1/5

Russ [2019-01-04 22:21, Shed of Science]

· Starting at 3:00 UT 1/1/19 run until about 9UT.

Russ [2019-01-01 03:06, Shed of Science] Message sent to BinAstPhotSurvey conference

· Don Pray has done this new target from Sugarloaf Mountain: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/03680.png
Object closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2016-03-05 15:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 02:10 UT.
Don [2016-03-01 00:46, Sugarloaf]

· Started a second run on this at 02:20 UT.
Don [2016-02-29 02:20, Sugarloaf] Message sent to BinAstPhotSurvey conference

(37820) 1998 BL8 (Finished) [Add new note]
· Marc Deldem and JM. Lopez observed this new target: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/37820.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-11-29 12:40, Ondrejov] Message sent to BinAstPhotSurvey conference

(46780) 1998 HH52 (Finished) [Add new note]
· Russ Durkee observed this new target from Shed of Science South on 3 nights: A good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06854.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-11-23 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this one last night.

Russ [2021-11-09 02:41, Shed of Science]

(6854) Georgewest (Finished) [Add new note]
· Russ Durkee observed this new target from Shed of Science South on 3 nights: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06854.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Russ.

Petr [2021-11-23 14:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this last night 11/8.

Russ [2021-11-09 02:02, Shed of Science]

(4370) Dickens (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5071, copied below for your convenience.

Cheers, Petr

(4370) DICKENS
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during Sept. 12-Oct. 5 reveal that minor planet (4370) is a
binary system with an orbital period of 18.02 Â± 0.01 hr. The primary shows
a period of 2.7601 Â± 0.0002 hr and has a lightcurve amplitude of 0.09
magnitude at solar phases 8-20 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.12 to 0.24 magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.34 Â± 0.02. The
secondary appears synchronous and has a light-curve amplitude (in the combined
primary-plus-secondary light curve) of 0.04 mag, suggesting a moderately
elongated shape with an equatorial-axis ratio of 1.3 Â± 0.1.

2021 November 21 (CBET 5071) Daniel W. E. Green [2021-11-23 09:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/04370_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04370_2021a_p1.png

More data (errors < 0.02 mag; don't bother in less ideal conditions) would be useful to improve the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-24 0.12 0.255
2021-10-24 18.14 0.255
2021-10-25 12.16 0.255
2021-10-26 6.18 0.255
2021-10-27 0.20 0.255
2021-10-27 18.22 0.255
2021-10-28 12.24 0.255
2021-10-29 6.26 0.255
2021-10-30 0.28 0.255
2021-10-30 18.30 0.255
2021-10-31 12.32 0.255
2021-11- 1 6.34 0.255
2021-11- 2 0.36 0.255
2021-11- 2 18.38 0.255
2021-11- 3 12.40 0.255
2021-11- 4 6.42 0.255
2021-11- 5 0.44 0.255
2021-11- 5 18.46 0.255
2021-11- 6 12.48 0.255
2021-11- 7 6.50 0.255
2021-11- 8 0.52 0.255
2021-11- 8 18.54 0.255
2021-11- 9 12.56 0.255
2021-11-10 6.58 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2021-10-24 9.08 0.753
2021-10-25 3.10 0.753
2021-10-25 21.12 0.753
2021-10-26 15.14 0.753
2021-10-27 9.16 0.753
2021-10-28 3.18 0.753
2021-10-28 21.20 0.753
2021-10-29 15.22 0.753
2021-10-30 9.24 0.753
2021-10-31 3.26 0.753
2021-10-31 21.28 0.753
2021-11- 1 15.30 0.753
2021-11- 2 9.32 0.753
2021-11- 3 3.34 0.753
2021-11- 3 21.36 0.753
2021-11- 4 15.38 0.753
2021-11- 5 9.40 0.753
2021-11- 6 3.42 0.753
2021-11- 6 21.44 0.753
2021-11- 7 15.46 0.753
2021-11- 8 9.48 0.753
2021-11- 9 3.50 0.753
2021-11- 9 21.52 0.753

Clear Skies, Petr [2021-10-19 09:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this one to catch the .25 event.

Russ [2021-10-05 02:06, Shed of Science] Message sent to observers

· Started a run on this one tonight. Should catch the 0.75 event.

Russ [2021-09-25 03:09, Shed of Science]

· New data obtained by Vladimir Benishek. A likely solution:
http://www.asu.cas.cz/~asteroid/04370_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04370_2021a_p1.png

More data for both events are needed to nail down the solution. Errors < 0.02 mag are needed for this object; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9-24 17.32 0.254
2021- 9-25 11.34 0.254
2021- 9-26 5.36 0.254
2021- 9-26 23.38 0.254
2021- 9-27 17.40 0.254
2021- 9-28 11.42 0.254
2021- 9-29 5.44 0.254
2021- 9-29 23.46 0.254
2021- 9-30 17.48 0.254
2021-10- 1 11.50 0.254
2021-10- 2 5.52 0.254
2021-10- 2 23.54 0.254
2021-10- 3 17.56 0.254
2021-10- 4 11.58 0.254
2021-10- 5 5.60 0.254
2021-10- 5 23.62 0.254
2021-10- 6 17.64 0.254
2021-10- 7 11.66 0.254
2021-10- 8 5.68 0.254
2021-10- 8 23.70 0.254
2021-10- 9 17.72 0.254
2021-10-10 11.74 0.254
2021-10-11 5.76 0.254
2021-10-11 23.78 0.254
2021-10-12 17.80 0.254
2021-10-13 11.82 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9-25 2.32 0.754
2021- 9-25 20.34 0.754
2021- 9-26 14.36 0.754
2021- 9-27 8.38 0.754
2021- 9-28 2.40 0.754
2021- 9-28 20.42 0.754
2021- 9-29 14.44 0.754
2021- 9-30 8.46 0.754
2021-10- 1 2.48 0.754
2021-10- 1 20.50 0.754
2021-10- 2 14.52 0.754
2021-10- 3 8.54 0.754
2021-10- 4 2.56 0.754
2021-10- 4 20.58 0.754
2021-10- 5 14.60 0.754
2021-10- 6 8.62 0.754
2021-10- 7 2.64 0.754
2021-10- 7 20.66 0.754
2021-10- 8 14.68 0.754
2021-10- 9 8.70 0.754
2021-10-10 2.72 0.754
2021-10-10 20.74 0.754
2021-10-11 14.76 0.754
2021-10-12 8.78 0.754
2021-10-13 2.80 0.754
2021-10-13 20.82 0.754

Clear Skies, Petr [2021-09-24 09:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this one tonight under good conditions.

Russ [2021-09-23 02:34, Shed of Science] Message sent to observers

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. Tentative solution:
http://www.asu.cas.cz/~asteroid/04370_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04370_2021a_p1.png

Vladimir's weather forecast for coming nights is bad and he would appreciate a help by others here. Data with errors < 0.02 mag are needed for this object; don't bother in less ideal conditions.

Clear Skies, Petr [2021-09-16 10:48, Ondrejov] Message sent to BinAstPhotSurvey conference

(5478) Wartburg (Finished) - Paired Asteroid [Add new note]
· Done for the 3rd apparition. Petr [2021-11-17 14:06, Ondrejov]

· I started this at 01:00 in hopes of completing the lc for this paired asteroid in this lunation.
Don [2021-10-07 01:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I did a run on this on Sep 27.
Don [2021-09-28 19:22, Sugarloaf]

· Done for the 2nd apparition. Petr [2017-10-13 14:43, Ondrejov]

· I did a run on this paired asteroid Oct 13 UT.
Don [2017-10-13 14:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting a run on this paired asteroid at 02:00 UT.
Don [2017-09-11 01:00, Sugarloaf]

· Done for this apparition,
http://www.asu.cas.cz/~asteroid/005478.png

Cheers, Petr [2015-02-20 11:30, Ondrejov]

· Began observations from Prompt Tololo at 0040 UT. Joe [2015-02-19 00:52, Dark Sky & PROMPT] Message sent to observers

· Began observations from Prompt Tololo at 0050 UT. Joe [2015-02-17 00:57, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(3912) Troja (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5060, copied below for your convenience.

Cheers, Petr

(3912) TROJA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of Science
South Observatory during Sept. 7-Oct. 8 reveal that minor planet (3912) is a
binary system with an orbital period of 17.371 Â± 0.003 hr. The primary
shows a period of 3.65938 Â± 0.00007 hr and has a lightcurve amplitude of
0.18 magnitude at solar phases 1-8 degrees, suggesting a nearly spheroidal
shape. Mutual eclipse/occultation events that are 0.11 to 0.14 magnitude
deep indicate a secondary-to-primary mean-diameter ratio of 0.33 Â± 0.02.
The secondary appears synchronous and has a light-curve amplitude (in the
combined primary-plus-secondary light curve) of 0.04 mag, suggesting a
moderately elongated shape with an equatorial-axis ratio of 1.4 Â± 0.2.

2021 October 22 (CBET 5060) Daniel W. E. Green [2021-10-25 07:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this one

Russ [2021-10-03 02:49, Shed of Science] Message sent to observers

· Vladimir Benishek has observed this off-list target from Sopot on 8 nights, found it to be binary. Current solution:
http://www.asu.cas.cz/~asteroid/03912_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03912_2021a_p1.png

Refining the solution with more high-quality data (errors < 0.02 mag) would be good before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9-14 16.74 0.252
2021- 9-15 10.12 0.252
2021- 9-16 3.50 0.252
2021- 9-16 20.88 0.252
2021- 9-17 14.26 0.252
2021- 9-24 2.68 0.252
2021- 9-24 20.06 0.252
2021- 9-25 13.44 0.252
2021- 9-26 6.82 0.252
2021- 9-27 0.20 0.252
2021- 9-27 17.58 0.252
2021- 9-28 10.96 0.252
2021- 9-29 4.34 0.252
2021- 9-29 21.72 0.252
2021- 9-30 15.10 0.252
2021-10- 1 8.48 0.252
2021-10- 2 1.86 0.252
2021-10- 2 19.24 0.252
2021-10- 3 12.62 0.252
2021-10- 4 6.00 0.252
2021-10- 4 23.38 0.252
2021-10- 5 16.76 0.252
2021-10- 6 10.14 0.252
2021-10- 7 3.52 0.252
2021-10- 7 20.90 0.252
2021-10- 8 14.28 0.252
2021-10- 9 7.66 0.252
2021-10-10 1.04 0.252
2021-10-10 18.42 0.252
2021-10-11 11.80 0.252
2021-10-12 5.18 0.252
2021-10-12 22.56 0.252
2021-10-13 15.94 0.252
2021-10-14 9.32 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9-15 1.42 0.752
2021- 9-15 18.80 0.752
2021- 9-16 12.18 0.752
2021- 9-17 5.56 0.752
2021- 9-17 22.94 0.752
2021- 9-24 11.36 0.752
2021- 9-25 4.74 0.752
2021- 9-25 22.12 0.752
2021- 9-26 15.50 0.752
2021- 9-27 8.88 0.752
2021- 9-28 2.26 0.752
2021- 9-28 19.64 0.752
2021- 9-29 13.02 0.752
2021- 9-30 6.40 0.752
2021- 9-30 23.78 0.752
2021-10- 1 17.16 0.752
2021-10- 2 10.54 0.752
2021-10- 3 3.92 0.752
2021-10- 3 21.30 0.752
2021-10- 4 14.68 0.752
2021-10- 5 8.06 0.752
2021-10- 6 1.44 0.752
2021-10- 6 18.82 0.752
2021-10- 7 12.20 0.752
2021-10- 8 5.58 0.752
2021-10- 8 22.96 0.752
2021-10- 9 16.34 0.752
2021-10-10 9.72 0.752
2021-10-11 3.10 0.752
2021-10-11 20.48 0.752
2021-10-12 13.86 0.752
2021-10-13 7.24 0.752
2021-10-14 0.62 0.752
2021-10-14 18.00 0.752

Clear Skies, Petr [2021-09-14 08:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(3699) Milbourn (Finished) [Add new note]
· This new target was observed by Alessandro Marchini and colleagues from Siena: Good solution and coverage, no deviation seen.
http://www.asu.cas.cz/~asteroid/03699.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Alessandro and coll.

Cheers, Petr [2021-10-13 07:30, Ondrejov] Message sent to BinAstPhotSurvey conference

(15363) Ysaye (Finished) - prime suspect [Add new note]
· Don Pray observed this returned "prime suspect" from Sugarloaf Mountain: An U = 2+ solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/15363_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-10-04 13:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this on Sep 27 UT.
Don [2021-09-28 01:10, Sugarloaf]

· This new target was done by Don Pray from Sugarloaf Mountain and by Joe Pollock with Prompt. It's a U = 2 solution only, but no obvious suspicion for binarity.
http://www.asu.cas.cz/~asteroid/15363.png
Its conditions have deteriorated, so the target is closed now.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2014-08-19 10:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 03:40.
Don [2014-08-01 03:43, Sugarloaf] Message sent to observers

· Starting at 03:35 UT.
Don [2014-07-31 03:06, Sugarloaf]

· Started this at 03:45 in variable clouds.
Don [2014-07-30 04:18, Sugarloaf]

· I'm starting this at 03:50 UT.
Don [2014-07-22 02:43, Sugarloaf] Message sent to observers

· Started on this one at 0110 UT from Prompt Tololo. Plan to run until about 1000 UT. Joe [2014-07-21 03:21, Dark Sky & PROMPT]

· I plan to start this at 03:50 UT.
Don [2014-07-21 03:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I began this new target last night. It was covered for about 3 hours.
Don [2014-07-06 16:02, Sugarloaf]

(17081) Jaytee (Finished) - binary [Add new note]
· Our report on this one has appeared in CBET 5044, copied below for your convenience.

Cheers, Petr

(17081) JAYTEE
F. Vachier, Observatoire de Paris; P. Pravec and P. Kusnirak, Ondrejov
Observatory; V. Chiorny, Kharkiv Observatory; J. Oey, Blue Mountains
Observatory, Leura, NSW, Australia; R. Durkee, Shed of Science South
Observatory, Pontotoc, TX, U.S.A.; V. Benishek, Belgrade Astronomical
Observatory; and P. Thierry, A. Klotz, and J. Berthier, Observatoire des
Makes, Reunion, report that photometric observations taken with a 0.6-m
telescope at the Observatoire des Makes, a 0.70-m telescope at the Chuguev
station of the Kharkiv Observatory in Ukraine, a 0.35-m telescope at the
Blue Mountains Observatory, a 0.50-m telescope at the Shed of Science South
Observatory, and a 0.35-m telescope at the Sopot Observatory in Serbia during
July 30-Sept. 11 reveal that minor planet (17081) is a binary system with an
orbital period of 16.342 Â± 0.010 hr. The primary shows a period of 2.8818
Â± 0.0002 hr and has a lightcurve amplitude of 0.17 mag at solar phases 3-8
degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.07 to 0.14 magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.26.

2021 September 25 (CBET 5044) Daniel W. E. Green [2021-09-29 08:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on several nights 09/03,09/06,09/07,09/08,09/10 refining both events [2021-09-11 05:56, Blue Mountains Obs] Message sent to observers

· Started a run on this tonight.

Russ [2021-09-11 02:17, Shed of Science]

· I observed this one tonight from 18.0 to 23.2 U.T.
Vasilij Ch. [2021-09-07 23:29, Kharkiv] Message sent to observers

· observed 09/01 from 10 to 14.4UT capturing phase 0.75 event. [2021-09-02 12:09, Blue Mountains Obs]

· A likely solution for this new binary:
http://www.asu.cas.cz/~asteroid/17081_2021a_porb.png
http://www.asu.cas.cz/~asteroid/17081_2021a_p1.png
http://www.asu.cas.cz/~asteroid/17081_2021b_porb.png
http://www.asu.cas.cz/~asteroid/17081_2021b_p1.png
http://www.asu.cas.cz/~asteroid/17081_2021c_porb.png
http://www.asu.cas.cz/~asteroid/17081_2021c_p1.png

More data (with errors <= 0.02 mag) for both events are needed to nail down the solution; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9- 1 2.82 0.256
2021- 9- 1 19.16 0.256
2021- 9- 2 11.51 0.256
2021- 9- 3 3.85 0.256
2021- 9- 3 20.19 0.256
2021- 9- 4 12.54 0.256
2021- 9- 5 4.88 0.256
2021- 9- 5 21.22 0.256
2021- 9- 6 13.56 0.256
2021- 9- 7 5.91 0.256
2021- 9- 7 22.25 0.256
2021- 9- 8 14.59 0.256
2021- 9- 9 6.94 0.256
2021- 9- 9 23.28 0.256
2021- 9-10 15.62 0.256
2021- 9-11 7.97 0.256
2021- 9-12 0.31 0.256
2021- 9-12 16.65 0.256
2021- 9-13 8.99 0.256
2021- 9-14 1.34 0.256
2021- 9-14 17.68 0.256
2021- 9-15 10.02 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2021- 8-31 18.64 0.756
2021- 9- 1 10.98 0.756
2021- 9- 2 3.33 0.756
2021- 9- 2 19.67 0.756
2021- 9- 3 12.01 0.756
2021- 9- 4 4.36 0.756
2021- 9- 4 20.70 0.756
2021- 9- 5 13.04 0.756
2021- 9- 6 5.38 0.756
2021- 9- 6 21.73 0.756
2021- 9- 7 14.07 0.756
2021- 9- 8 6.41 0.756
2021- 9- 8 22.76 0.756
2021- 9- 9 15.10 0.756
2021- 9-10 7.44 0.756
2021- 9-10 23.79 0.756
2021- 9-11 16.13 0.756
2021- 9-12 8.47 0.756
2021- 9-13 0.81 0.756
2021- 9-13 17.16 0.756
2021- 9-14 9.50 0.756
2021- 9-15 1.84 0.756

Clear Skies, Petr [2021-08-31 12:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one on 29/30 Aug from 17:45 to 23:15 UT and on 30/31 Aug from 17:50 to 23:30 UT.
Vasilij Ch. [2021-08-31 00:30, Kharkiv] Message sent to observers

· Starting this one again tonight.

Russ [2021-08-26 03:45, Shed of Science]

· Just started a run on this one under good conditions.
Russ [2021-08-25 03:39, Shed of Science] Message sent to observers

· Fred Vachier has observed this one, his data reveal it to be a binary candidate. A tentative solution:
http://www.asu.cas.cz/~asteroid/17081_2021a_porb.png
http://www.asu.cas.cz/~asteroid/17081_2021a_p1.png

More data are needed to establish it. I encourage others here to help out. Data with errors <= 0.02 mag are needed.

Clear Skies, Petr [2021-08-13 13:06, Ondrejov] Message sent to BinAstPhotSurvey conference

(33916) 2000 LF19 (Finished) - prime suspect [Add new note]
· Russ Durkee observed this return "prime suspect" from Shed of Science South: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/33916_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-09-22 14:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this tonight.
Russ [2021-09-16 01:58, Shed of Science] Message sent to observers

· Starting a run on this one tonight.

Russ [2021-09-12 03:01, Shed of Science]

· Did a run on this one on 9/5.

Russ [2021-09-06 01:49, Shed of Science] Message sent to BinAstPhotSurvey conference

· Done by Michal and Marek from Skalnate Pleso (4 nights) and by Don from Carbuncle Hill (1 night):
http://www.asu.cas.cz/~asteroid/33916.png
It is finished for the Survey:
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2007-07-19 07:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:00 UT in good conditions. Michal [2007-07-17 20:31, SkalnatePleso] [Remove]

· Observing from 19:55 UT at good sky, but a bit windy conditions. Michal [2007-07-16 20:07, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Good data for this one, Michal and Marek:
http://www.asu.cas.cz/~asteroid/33916.png
One more full night will probably complete it.

Cheers, Petr [2007-07-16 08:10, Ondrejov]

· Observing from 19:55 UT in good conditions. Michal [2007-07-15 19:57, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 21:05 UT in good conditions. Michal [2007-07-14 21:17, SkalnatePleso] [Remove]

· Don suggests a period roughly 4 hours:
http://www.asu.cas.cz/~asteroid/33916.png
Someone can take it over while Don is away.

Cheers, Petr [2007-07-13 17:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one tonight, but after tonight I'll be gone for a week, so feel free to continue with it.
Don [2007-07-13 03:16, CarbuncleHill]

(5772) Johnlambert (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 5042, copied below for your convenience.

Cheers, Petr

(5772) JOHNLAMBERT
V. Benishek, Belgrade Astronomical Observatory; and P. Pravec, Ondrejov
Observatory, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia during Aug. 8-Sept. 12 reveal
that minor planet (5772) is a binary system with an orbital period of 17.98
Â± 0.01 hr. The primary shows a period of 3.0782 Â± 0.0002 hr and has a
lightcurve amplitude of 0.17 magnitude at solar phases 6-9 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.05 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.22.

2021 September 19 (CBET 5042) Daniel W. E. Green [2021-09-20 07:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current data for this one:
http://www.asu.cas.cz/~asteroid/05772_2021a_porb.png
http://www.asu.cas.cz/~asteroid/05772_2021a_p1.png
http://www.asu.cas.cz/~asteroid/05772_2021b_porb.png
http://www.asu.cas.cz/~asteroid/05772_2021b_p1.png

More data (errors < 0.02 mag) for both events needed before we publish this one on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9- 9 13.12 0.249
2021- 9-10 7.10 0.249
2021- 9-11 1.08 0.249
2021- 9-11 19.06 0.249
2021- 9-12 13.04 0.249
2021- 9-13 7.02 0.249
2021- 9-14 1.00 0.249
2021- 9-14 18.98 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2021- 9- 9 22.12 0.750
2021- 9-10 16.10 0.750
2021- 9-11 10.08 0.750
2021- 9-12 4.06 0.750
2021- 9-12 22.04 0.750
2021- 9-13 16.02 0.750
2021- 9-14 10.00 0.750

Clear Skies, Petr [2021-09-09 08:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot, found it to be a serious binary candidate; a likely solution:
http://www.asu.cas.cz/~asteroid/05772_2021a_porb.png
http://www.asu.cas.cz/~asteroid/05772_2021a_p1.png

The orbit period needs to be nailed down with more data. Errors < 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris for the likely solution:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 8-25 12.45 0.260
2021- 8-26 6.35 0.260
2021- 8-27 0.25 0.260
2021- 8-27 18.15 0.260
2021- 8-28 12.05 0.260
2021- 8-29 5.95 0.260
2021- 8-29 23.85 0.260
2021- 8-30 17.75 0.260
2021- 8-31 11.65 0.260
2021- 9- 1 5.55 0.260
2021- 9- 1 23.45 0.260
2021- 9- 2 17.35 0.260
2021- 9- 3 11.25 0.260
2021- 9- 4 5.15 0.260
2021- 9- 4 23.05 0.260
2021- 9- 5 16.95 0.260
2021- 9- 6 10.85 0.260
2021- 9- 7 4.75 0.260
2021- 9- 7 22.65 0.260
2021- 9- 8 16.55 0.260
2021- 9- 9 10.45 0.260
2021- 9-10 4.35 0.260
2021- 9-10 22.25 0.260
2021- 9-11 16.15 0.260
2021- 9-12 10.05 0.260
2021- 9-13 3.95 0.260
2021- 9-13 21.85 0.260
2021- 9-14 15.75 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2021- 8-25 21.05 0.740
2021- 8-26 14.95 0.740
2021- 8-27 8.85 0.740
2021- 8-28 2.75 0.740
2021- 8-28 20.65 0.740
2021- 8-29 14.55 0.740
2021- 8-30 8.45 0.740
2021- 8-31 2.35 0.740
2021- 8-31 20.25 0.740
2021- 9- 1 14.15 0.740
2021- 9- 2 8.05 0.740
2021- 9- 3 1.95 0.740
2021- 9- 3 19.85 0.740
2021- 9- 4 13.75 0.740
2021- 9- 5 7.65 0.740
2021- 9- 6 1.55 0.740
2021- 9- 6 19.45 0.740
2021- 9- 7 13.35 0.740
2021- 9- 8 7.25 0.740
2021- 9- 9 1.15 0.740
2021- 9- 9 19.05 0.740
2021- 9-10 12.95 0.740
2021- 9-11 6.85 0.740
2021- 9-12 0.75 0.740
2021- 9-12 18.65 0.740
2021- 9-13 12.55 0.740
2021- 9-14 6.45 0.740

Clear Skies, Petr [2021-08-18 11:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(15040) 1998 XC (Finished) - prime suspect [Add new note]
· Julian Oey observed this returned "prime suspect" from Leura in August: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/15040_2021a.png
http://www.asu.cas.cz/~asteroid/15040_2021b.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-09-15 10:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· additional observations on 08/28,08/29,08/30,08/31 [2021-09-01 21:46, Blue Mountains Obs] Message sent to observers

· observed this asteroid from 11:21 to 17:43 UT under good condition. [2021-08-14 22:51, Blue Mountains Obs]

· Starting observing a new asteroid from 11:23 to 17:49UT [2021-08-13 22:43, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek and Vasilij Chiorny observed this new target from Sopot and Kharkiv: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/15040.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-11-14 13:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target on 7/8 Nov from 23:15 to 03:15 UT.
Vasilij Ch. [2018-11-08 04:41, Kharkiv] Message sent to observers

· Observed this one last night on Nov 1/2 from 18:15 to 24:15 UT. Vasilij Ch. [2018-11-02 19:03, Kharkiv]

· I observed this new target on Oct. 31, 00:52-03:53 UT.
Vladimir [2018-10-31 14:31, Sopot AO] Message sent to BinAstPhotSurvey conference

(6787) 1991 PF15 (Finished) [Add new note]
· This new target was observed by Fred Vachier and by Alessandro Marchini and colleagues: Unique solution, good coverage, no trustable deviation.
http://www.asu.cas.cz/~asteroid/06787.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-09-14 10:42, Ondrejov] Message sent to BinAstPhotSurvey conference

(8416) Okada (Finished) [Add new note]
· Alessandro Marchini and his colleagues observed this new target from Siena: A good U = 2 solution, reasonable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/08416.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on this low-amplitude object.

Petr [2021-09-13 09:00, Ondrejov] Message sent to BinAstPhotSurvey conference

(1949) Messina (Finished) [Add new note]
· Vladimir Benishek observed this return "prime suspect" from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01949_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-09-02 10:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has done this new target from Sugarloaf Mountain: Unique period, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/01949.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-12-01 08:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run at 00:55, Nov 29.
Don [2014-11-28 22:10, Sugarloaf]

· Started this new target at 01:30 UT.
Don [2014-11-22 02:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1713) Bancilhon (Finished) - prime suspect [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01713.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-09-02 09:53, Ondrejov] Message sent to BinAstPhotSurvey conference

(20869) 2000 VK45 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 6 nights, obtained a good solution despite the period near 12 hours.
http://www.asu.cas.cz/~asteroid/20869.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-09-01 11:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've done a couple runs on this over the last week. Now back into semi-cloudy weather for days to come.
Don [2021-08-07 22:26, Sugarloaf]

(19912) Aurapenenta (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no prominent deviation above the limit of the Survey.
http://www.asu.cas.cz/~asteroid/19912.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-08-29 11:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Iâ€™ve been working this new target for a few nights now. I started another run tonight.
Vladimir [2021-08-19 23:39, Sopot AO]

(7729) Golovanov (Finished) - prime suspect [Add new note]
· This return "prime suspect" was observed by Russ Durkee from Shed of Science South and by Julian Oey from Leura: Good solution and coverage, no trusted deviation seen.
http://www.asu.cas.cz/~asteroid/07729_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-08-25 10:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· supporting observation on 08/06 from 11:02 to 19:22 UT under good condition. Data sent in [2021-08-13 11:26, Blue Mountains Obs] Message sent to observers

· Will start a run on this one tonight if the weather holds.

Russ [2021-08-11 04:27, Shed of Science]

· Started a run on this tonight starting at about 5UT 8/7. Also covered it on 8/4

Russ [2021-08-07 06:38, Shed of Science] Message sent to BinAstPhotSurvey conference

· This new target was done by Hana Kucakova, Jan Vrastil and Kamil Hornoch from here: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/07729.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-04-11 11:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed by Hana Kucakova and Kamil Hornoch from here on the past night. It's a period of 3.40 hr and amplitude 0.38 mag. We plan to take a second run tonight (before our primary target begins).

Petr [2017-03-28 07:07, Ondrejov] Message sent to BinAstPhotSurvey conference

(60770) 2000 GL143 (Finished) [Add new note]
· Insufficient data for the Survey. Put to
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2021-08-25 10:28, Ondrejov]

· I've done 2 runs on this one in the last few days.
Don [2021-06-15 01:21, Sugarloaf] Message sent to BinAstPhotSurvey conference

(28491) 2000 CC59 (Finished) [Add new note]
· Insufficient data for the Survey. Put to
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2021-08-25 10:22, Ondrejov]

· I've done 2 runs on this in the last few days.
Don [2021-06-15 01:20, Sugarloaf] Message sent to BinAstPhotSurvey conference

(11452) 1980 KE (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/11452.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-08-23 08:13, Ondrejov] Message sent to BinAstPhotSurvey conference

(159476) 2000 RH79 [Add new note]
[Send data to: peter@asu.cas.cz ]
· Started a run on this one tonight.
Vladimir [2021-08-19 23:46, Sopot AO] Message sent to BinAstPhotSurvey conference

(5325) Silver (Finished) - prime suspect [Add new note]
· Russ Durkee observed this returned "prime suspect" from Shed of Science South on 4 nights: Good solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05325_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-08-11 08:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have a few nights data on this object and am following it tonight 8/7 starting at about 5UT [2021-08-07 06:20, Shed of Science]

· This return "prime suspect" was observed by Vladimir Benishek from Sopot and by Don Pray from Sugarloaf Mountain in its current 3rd apparition: A good solution (agreeing with data from the first two apparitions), no deviation.
http://www.asu.cas.cz/~asteroid/05325_b7.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2017-04-26 10:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on the Apr 24 UT.
Don [2017-04-25 01:55, Sugarloaf]

· Despite our extensive effort, the two suspect attenuations were not confirmed. Closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2010-09-21 13:55, Ondrejov]

· Observed 2010-08-30 in average conditions cut short by cloud. [2010-08-31 07:10, HuntersHill] Message sent to observers

· Observing tonight from about 4:45UT to 9UT under good conditions.

Russ [2010-07-21 04:31, Shed of Science]

· Observing tonight from 22:15 UT. Gabo [2010-07-11 17:36, SkalnatePleso] [Remove]
Message sent to observers

· Started another session on this tonight at about 5UT to 9UT under good conditions.

Regards,
Russ [2010-07-10 03:46, Shed of Science]

· Started a four hour run on this one under good conditions.

Russ [2010-07-09 05:18, Shed of Science] Message sent to observers

· Observing this one from 22:05 UT. Best wishes, Kamil [2010-07-06 22:23, Ondrejov]

· Planning this one tonight, starting ~22:15UT. Jozef, Stefan [2010-07-04 21:39, Modra]

· Planning this one tonight, starting ~22:15UT. Jozef, Stefan. [2010-07-02 21:45, Modra]

· Observing this target tonight (1 July) [2010-07-01 13:18, HuntersHill] Message sent to observers

· Going to observe from 22:30 UT. Jozef, Leos. [2010-06-30 22:25, Modra]

· Today I observed Silver from 22:00 UT. Gabo [2010-06-29 20:44, SkalnatePleso] [Remove]
Message sent to observers

· David has captured a suspect attenuation, with depth on the nominal limit of the Survey:
http://www.asu.cas.cz/~asteroid/05325_b0.png
http://www.asu.cas.cz/~asteroid/05325_100613.png
More observations needed to confirm.

Clear Skies, Petr [2010-06-24 13:38, Ondrejov]

· Observed 2010 06 13 from 1328UT to 2011UT in reasonable conditions. Data reveals a period of approx 4.00 +/- 0.04hrs with an amplitude of 0.2 +/- 0.01mag [2010-06-13 22:19, HuntersHill] Message sent to observers

· Began observing from Prompt 06/11-12/2010 at ~0330 UT. Excellent conditions. Hope to get 6 hours. Joe [2010-06-12 04:07, Dark Sky & PROMPT]

· Silver is my object from 23:00 UT. Gabo [2010-06-09 22:07, SkalnatePleso] [Remove]
Message sent to observers

· We observed this one "prime suspect" in two nights. As you know the rot. period is very close to 4 hrs, and due to low altitude the same part of lightcurve (only about a half) is seen from our observatory. Data from non-european longitudes are needed.
Marek [2010-06-08 12:51, SkalnatePleso] [Remove]
Message sent to observers

· My object this night is Silver, from 23:00 UT. Gabo [2010-06-07 21:49, SkalnatePleso] [Remove]

· This night observed asteroid Silver from 23:00 UT. Gabo [2010-06-05 18:53, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This one has been well done by Vishnu and Ron from Badlands (who effectively took over the principal role station for this one), by Bob Stephens from GMARS, by Marek Husarik et al. from Skalnate Pleso, and by Adrian from Modra. Unique period, multiple coverage, no deviation seen. Finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
http://www.asu.cas.cz/~asteroid/5325.png

Nice work, guys!

Cheers, Petr [2006-04-24 09:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Imaged from GMARS on 2006-04-22 and 2006-04-23 getting clean runs on each night. Period is 4.02 hours with assemetric extremas. No deviations were noted.

Bob Stephens [2006-04-23 20:21, Santana] Message sent to BinAstPhotSurvey conference

· Just started this target. Should be clear for a full run.

Ron & Vishnu [2006-04-22 02:42, Vishnu Reddy/Tucson]

· I prefered this to 1629 as the latter seems to me to be covered quite well according to Petr's composite lightcurve available. I hope the latest Don's and Bob's data could confirm the solution even without my tonight assistance.

Adrian [2006-04-21 20:06, Modra] Message sent to BinAstPhotSurvey conference

· Just completed a run of 7+ hours on this one.

Ron [2006-04-21 10:55, Vishnu Reddy/Tucson]

· A few periods possible, most likely in the range 2-3 hours (but longer periods are not ruled out; your sessions were only 2.9 and 1.6 hours long). A couple long sessions with errors <0.02 mag might nail it down.

Clear Skies, Petr [2006-04-10 15:41, Ondrejov] Message sent to BinAstPhotSurvey conference

(6792) Akiyamatakashi (Finished) [Add new note]
· Insufficient coverage for the BinAstPhotSurvey; target closed.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2021-07-26 08:20, Ondrejov]

· observed on 11/10,11/11,11/13,11/14 and 10/11 [2021-01-01 20:28, Blue Mountains Obs] Message sent to observers

· Started observing this new target on 09/13 from 12.5 to 18.5 UT and 09/15 from 13 to 19 UT [2020-09-17 20:33, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5382) McKay (Finished) [Add new note]
· Russ Durkee observed this new target from Shed of Science South on five nights, found it to be a slow rotator. Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-07-20 08:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this object. [2021-07-16 04:02, Shed of Science] Message sent to observers

· Starting a run on this object tonight.

Russ [2021-07-02 03:19, Shed of Science]

· Will follow this tonight.

Russ [2021-06-18 03:16, Shed of Science] Message sent to observers

· Will follow this one tonight.

Russ [2021-06-16 03:04, Shed of Science]

· Did a run early 6/14. [2021-06-14 14:17, Shed of Science] Message sent to BinAstPhotSurvey conference

(5838) Hamsun (Finished) [Add new note]
· This new target was observed by Marc Deldem, by Eric Barbotin, and by Kamil Hornoch and Hana Kucakova: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05838.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-07-19 08:04, Ondrejov] Message sent to BinAstPhotSurvey conference

(9871) Jeon (Finished) - slow rotator [Add new note]
· Don Pray worked this new target, found it to be a slow rotator. Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-07-02 08:27, Ondrejov]

(7274) Washioyama (Finished) [Add new note]
· Done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-07-02 08:17, Ondrejov]

· Started this new target on Mar 14.
Don [2021-03-19 20:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5726) Rubin (Finished) [Add new note]
· Unsuccessfull attempt. The U = 2 result put to
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2021-07-01 13:55, Ondrejov]

· Starting this one tonight, Apr 9 UT.
Don [2021-04-09 00:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3448) Narbut (Finished) [Add new note]
· Closed for the Survey (slow rotator).
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-07-01 09:13, Ondrejov]

· Started again tonight.

Russ [2021-01-16 06:01, Shed of Science] Message sent to observers

· Just started this new target.

Russ [2021-01-15 04:29, Shed of Science] Message sent to BinAstPhotSurvey conference

(2044) Wirt (Finished) - binary [Add new note]
· Done in the 5th apparition: Inconclusive re. presence of events. Petr [2021-07-01 08:58, Ondrejov] Message sent to observers

· Will start a run on this tonight.

Russ [2021-05-07 02:45, Shed of Science]

· Doing a run on this one tonight.

Russ [2021-05-06 02:55, Shed of Science] Message sent to observers

· Got 9 hours last night from DSO. Hope to get a similar run tonight. Joe [2021-04-04 23:55, Dark Sky & PROMPT]

· Began run tonight from DSO at 0100 UT and hope to follow until 1000 UT. Joe [2021-04-04 01:27, Dark Sky & PROMPT] Message sent to observers

· An old friend returns. Started this one again on Mar 7.
Don [2021-03-08 01:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Closed for this apparition. [2017-01-10 09:19, Ondrejov]

· Current status of this one:
http://www.asu.cas.cz/~asteroid/02044_2016_porb.png
http://www.asu.cas.cz/~asteroid/02044_2016_p1.png

It would be good to check the orbital phases around phase 0.745 (ephemeris below) to see whether the shallow attenuations there observed on 2016-10-25.0 and 11-27.2 are real or observational artifacts. High quality data (errors < 0.02 mag) and long sessions are needed.

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 17.96 0.745
2016-12-18 12.93 0.745
2016-12-19 7.90 0.745
2016-12-20 2.87 0.745
2016-12-20 21.84 0.745
2016-12-21 16.81 0.745
2016-12-22 11.78 0.745
2016-12-23 6.75 0.745
2016-12-24 1.72 0.745
2016-12-24 20.69 0.745
2016-12-25 15.66 0.745
2016-12-26 10.63 0.745
2016-12-27 5.60 0.745
2016-12-28 0.57 0.745
2016-12-28 19.54 0.745
2016-12-29 14.51 0.745
2016-12-30 9.48 0.745
2016-12-31 4.45 0.745
2016-12-31 23.42 0.745
2017- 1- 1 18.39 0.745
2017- 1- 2 13.36 0.745
2017- 1- 3 8.33 0.745
2017- 1- 4 3.30 0.745
2017- 1- 4 22.27 0.745
2017- 1- 5 17.24 0.745

Clear Skies, Petr [2016-12-09 09:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 02:30 UT.
Don [2016-11-27 02:29, Sugarloaf] Message sent to observers

· Started a run at 00:15 UT.
Don [2016-11-18 00:53, Sugarloaf]

· This return binary was observed by Vladimir Benishek from Sopot, by Don Pray from Sugarloaf Mountain and by Walt Cooney from SRO. No event detected ---apparently we were outside event geometry--- but Vladimir's data contain signal from a second period (though the solution for P_2 is not unique). The higher quality data by Walt and Don from 2016-11-06 and 10 don't have a prominent signal at that (or any other) second period. Lightcurve decompositions:
http://www.asu.cas.cz/~asteroid/02044_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02044_2016a_p2.png
http://www.asu.cas.cz/~asteroid/02044_2016a_porb.png
http://www.asu.cas.cz/~asteroid/02044_2016b_p1.png
http://www.asu.cas.cz/~asteroid/02044_2016b_p2.png
http://www.asu.cas.cz/~asteroid/02044_2016b_porb.png

We have not seen a second rotational period in the previous two apparitions. I suspect that the additional signal in the Vladimir's data may be spurious, though its cause is not known. Anyway, more high quality (errors 0.01 mag and long sessions) data in the next lunation would be useful.

Clear Skies, Petr [2016-11-11 18:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work from SRO tonight. -Walt [2016-11-05 23:59, Sonoita] Message sent to observers

· Another session obtained on Oct. 29-30, 23:20-03:09 UT.

Vladimir [2016-10-30 07:59, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed from Sopot last night (Oct. 28, 19:59-22:28 UT).

Vladimir [2016-10-29 13:05, Sopot AO]

· I plan to start this at 02:50 UT to capture the 0.262 phase event at 4:03 UT.
Don [2016-10-26 01:28, Sugarloaf] Message sent to observers

· Vladimir Benishek took first two nights for this return binary in its current 3rd apparition. There is apparent a shallow event; a lc decomposition:
http://www.asu.cas.cz/~asteroid/02044_2016a_porb.png
http://www.asu.cas.cz/~asteroid/02044_2016a_p1.png

More good-quality data are needed to confirm and describe the events. Vladimir will try to take them, but his weather forecast is not promissing for the coming nights so we would like to ask you others for help. Data with errors of 0.01 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-26 4.03 0.262
2016-10-26 23.00 0.262
2016-10-27 17.97 0.262
2016-10-28 12.94 0.262
2016-10-29 7.91 0.262
2016-10-30 2.88 0.262
2016-10-30 21.85 0.262
2016-10-31 16.82 0.262
2016-11- 1 11.79 0.262
2016-11- 2 6.76 0.262
2016-11- 3 1.73 0.262
2016-11- 3 20.70 0.262
2016-11- 4 15.67 0.262
2016-11- 5 10.64 0.262
2016-11- 6 5.61 0.262
2016-11- 7 0.58 0.262
2016-11- 7 19.55 0.262
2016-11- 8 14.52 0.262
2016-11- 9 9.49 0.262
2016-11-10 4.46 0.262
2016-11-10 23.43 0.262
2016-11-11 18.40 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-25 18.55 0.762
2016-10-26 13.52 0.762
2016-10-27 8.49 0.762
2016-10-28 3.46 0.762
2016-10-28 22.43 0.762
2016-10-29 17.40 0.762
2016-10-30 12.37 0.762
2016-10-31 7.34 0.762
2016-11- 1 2.31 0.762
2016-11- 1 21.28 0.762
2016-11- 2 16.25 0.762
2016-11- 3 11.22 0.762
2016-11- 4 6.19 0.762
2016-11- 5 1.16 0.762
2016-11- 5 20.13 0.762
2016-11- 6 15.10 0.762
2016-11- 7 10.07 0.762
2016-11- 8 5.04 0.762
2016-11- 9 0.01 0.762
2016-11- 9 18.98 0.762
2016-11-10 13.95 0.762
2016-11-11 8.92 0.762

Clear Skies,

Petr [2016-10-25 13:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· I obtained a session on this return binary on Oct 23-24, 20:37-03:28 UT.

Vladimir [2016-10-24 09:03, Sopot AO]

· Done for the 2nd apparition, no prominent events detected:
http://www.asu.cas.cz/~asteroid/02044_10_p1.png
http://www.asu.cas.cz/~asteroid/02044_10_porb.png
Note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Petr [2010-05-27 11:58, Ondrejov]

· I will be observing this one from ~19:10 UT. Best wishes, Kamil [2010-04-17 18:50, Ondrejov] Message sent to observers

· Working this one from SRO again tonight. -Walt [2010-04-06 02:09, Sonoita]

· Running from SRO tonight. -Walt [2010-04-05 01:51, Sonoita]

· I am observing this for several hours, but sometimes with some clouds around. Adrian [2010-04-03 00:32, Modra] Message sent to observers

· Observations by Don from Carbuncle Hill and by Peter here showed no prominent events during 2010-03-07 to 17, apparently the system was away from a deep eclipse geometry.
http://www.asu.cas.cz/~asteroid/02044_10_p1.png
http://www.asu.cas.cz/~asteroid/02044_10_porb.png
The asteroid will be still in favorable conditions in April
and monitoring around or after the opposition could be useful to show possible developing events as it may move into an eclipse geometry again.

Clear Skies, Petr [2010-03-24 13:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got run from Prompt 0330-0920 UT and from GORT 0950-1240 UT last night (3/22-23/2010). Joe [2010-03-23 15:04, Dark Sky & PROMPT] Message sent to observers

· Running from SRO tonight. -Walt [2010-03-21 03:10, Sonoita]

· Started a run at 03:40 UT under excellent conditions.
Don [2010-03-10 03:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a third night on this at 04:15 UT.
Don [2010-03-09 04:31, CarbuncleHill]

· Observing from 21:50 UT. Peter K. [2010-03-09 00:39, Ondrejov] Message sent to observers

· Follow-up observations of this binary were of limited success, mostly because priorities have been given to other objects and also because it moved into the Milky Way in the past lunation. Since its observational circumstances further deteriorate during this lunation, we may close its follow-up campaign now.

Petr [2006-02-15 10:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· While waiting for (7088) to be 30 degrees above horizon I glanced at this "dancing pair". I wished to stare longer, but 7088 has a higher priority. Moreover, there are many star-bystanders behind.

Adrian [2006-01-27 23:12, Modra] Message sent to BinAstPhotSurvey conference

· Parts of recent three nights were devoted to this. Crowded star field is confusing in analysis. But attenuations are still there. And the Moon is moving away. It is worth to continue.

Adrian [2006-01-14 03:48, Modra] Message sent to BinAstPhotSurvey conference

· Our discovery announcement for (2044) Wirt has been published on CBET 353, its copy enclosed below. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr

(2044) WIRT
D. Pray, Carbuncle Hill Observatory, Greene, RI; P. Pravec
and P. Kusnirak, Ondrejov Observatory; W. Cooney, J. Gross, and
D. Terrell, Sonoita Research Observatory, Sonoita, AZ; A. Galad,
S. Gajdos, and J. Vilagi, Modra Observatory; and R. Durkee,
Minneapolis, MN, report that photometric observations obtained
during 2005 Dec. 8-29 reveal that minor planet (2044) is a binary
system with an orbital period of 18.97 ± 0.01 hr. The primary
rotates with a period of 3.6898 ± 0.0001 hr, and its lightcurve
amplitude is 0.26 mag. Mutual eclipse/occultations events that
are 0.07- to 0.15-mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.25 ± 0.02.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 January 6 (CBET 353) Daniel W. E. Green [2006-01-07 11:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· This binary is turning to be even more interesting for future modeling. Following data joined in since my last posting on this one:
2005-12-20.1, 21.1, 22.2, 24.1 and 28.1 by Don from Carbuncle Hill
2005-12-23.1, 24.3 and 25.3 by Walt, John and Dirk from SRO
2005-12-29.8 by Peter K. from Ondrejov
The current solution see pictures:
http://www.asu.cas.cz/~ppravec/wirt_all.png
http://www.asu.cas.cz/~ppravec/wirt_longpc.png
http://www.asu.cas.cz/~ppravec/wirt_shortpc.png
While the primary event shows the "inverse peek" near the middle of the event, indicating that both occultation and eclipse phenomena occured at once at the orbital phases, the secondary event shows an opposite behavior: there is a brightenning near the middle of the secondary event. Well, the secondary event has been somewhat poorly covered, and the primary event has not been well covered recently as well. It would be useful to follow up both events with at least one long good night for each event soon; I'm enclosing their ephemerides below. Anyway, it looks that the basic parameters have been nailed down well:
Pprim = 3.6898 +/-0.0001 h
Porb = 18.97 +/-0.01 h
Ds/Dp = 0.25 +/-0.02
Aprim = 0.26 mag
Depths of the events: 0.07-0.15 mag.

We can prepare a discovery announcement for CBET now.

Cheers, Petr

PS: An interpretation of the opposite behaviors in the primary and the secondary events is not unique for now; it may be a north/south asymmetry of primary's limb, or a bit eccentric orbit, or a combination of both. Further data should tell.

Primary events:
Date/Time UTC (LTc.) Phase
--------------------------
2006- 1- 2 23.63 0.250
2006- 1- 3 18.60 0.250
2006- 1- 4 13.57 0.250
2006- 1- 5 8.54 0.250
2006- 1- 6 3.51 0.250
2006- 1- 6 22.48 0.250

Secondary events:
Date/Time UTC (LTc.) Phase
--------------------------
2006- 1- 3 9.20 0.755
2006- 1- 4 4.17 0.755
2006- 1- 4 23.14 0.755
2006- 1- 5 18.11 0.755
2006- 1- 6 13.08 0.755
2006- 1- 7 8.05 0.755 [2006-01-02 14:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run at 23:15, 12/30. Hope to fill in data in the secondary event.

Don [2005-12-30 23:30, CarbuncleHill]

· Started run 20 min before bottom of secondary event. Hopefully, passing clouds will be merciful.

Don [2005-12-24 04:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Data of 2005-12-19.1 by Russ Durkee from the Shed of Science Observatory, MN, joined in. They cover 4 hours of orbital phases outside of mutual events, fit well. Updated pictures:
http://www.asu.cas.cz/~ppravec/wirt_all.png
http://www.asu.cas.cz/~ppravec/wirt_longpc.png
http://www.asu.cas.cz/~ppravec/wirt_shortpc.png

I have looked a little bit on how fast changes of the shape of the primary event we may expect. Since the current geometry is somewhat "on edge", a change of solar phase by only a few degrees may produce observable changes in the primary event's shape. And the event was fully covered last time on 12-11.9 (at solar phase of 17 deg)! So, the event might have already changed by now. One good session covering it well (with errors <0.02 mag) is needed to show what happens there now. Ephemeris for the events is enclosed below.

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2005-12-21 8.00 0.251
2005-12-22 2.96 0.251
2005-12-22 21.92 0.251
2005-12-23 16.88 0.251
2005-12-24 11.84 0.251
2005-12-25 6.80 0.251
2005-12-26 1.76 0.251
2005-12-26 20.72 0.251
2005-12-27 15.68 0.251
2005-12-28 10.64 0.251
2005-12-29 5.60 0.251
2005-12-30 0.56 0.251
2005-12-30 19.52 0.251
2005-12-31 14.48 0.251 [2005-12-20 14:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don, Adrian, Stefan, Jozef,

Great work on this one! For all, I put here links to the pictures with the solution:
http://www.asu.cas.cz/~ppravec/wirt_all.png
http://www.asu.cas.cz/~ppravec/wirt_longpc.png
http://www.asu.cas.cz/~ppravec/wirt_shortpc.png
About half of the orbital period has been covered twice, but the other half (including the second event) needs to be covered more so that the solution is nailed down there and we can derive Ds/Dp. Then we can publish it.

Ephemeris for mid-times of the second event (around orbital phase 0.75) is enclosed below. Just remember that we need to cover also parts between the events, so observations as far away as 5 hours from the predicted times are needed to nail the solution down.

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2005-12-20 3.63 0.755
2005-12-20 22.59 0.755
2005-12-21 17.55 0.755
2005-12-22 12.51 0.755
2005-12-23 7.47 0.755
2005-12-24 2.43 0.755
2005-12-24 21.39 0.755
2005-12-25 16.35 0.755
2005-12-26 11.31 0.755
2005-12-27 6.27 0.755
2005-12-28 1.23 0.755
2005-12-28 20.19 0.755
2005-12-29 15.15 0.755
2005-12-30 10.11 0.755
2005-12-31 5.07 0.755 [2005-12-19 18:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· 2044 Wirt has been found to be a binary. Observations from myself at Carbuncle Hill and from Adrian, Jozo and Stefan at Modra, show that it has a Pprim = 3.6901 +/-0.0001 h, and Porb = 18.96 +/-0.01 h. About half of the orbital period has been covered, but the second mutual event needs more data so that Ds/Dp can be determined. Data with errors of 0.02 mag and less would be useful to complete the coverage.

Don [2005-12-19 18:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This may be a waste of time with the moonlight, but I'm doing a run on this tonight. So far, the images don't look half bad.

Don [2005-12-13 23:38, CarbuncleHill]

· This one looks interesting. Most of the three nights by Don from Carbuncle Hill and one night by Stefan and Jozo from Modra fit well with a unique period of 3.69 h, but some points show prominent deviations, see
http://www.asu.cas.cz/~ppravec/2044_Wirt.png
Though there may be some observational effects of poorer conditions (the Moon was not very far away), but the deviations call for our attention and they will need to be confirmed in the next lunation. Two good nights with errors <0.02 mag when the Moon is well away will be needed for it.

Cheers, Petr [2005-12-12 10:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 16:44 UT with it tonight,
and remeasured run from last night.

Stefan/Jozef [2005-12-11 21:20, Modra]

· At very bad air conditions we got 7.5h, period seems
to be roughly 3.6h or so, amplitude about 0.3mag.

Stefan/Jozef [2005-12-11 03:52, Modra] Message sent to BinAstPhotSurvey conference

· Started at 22:30ut (Dec 10). Clouds may interfere.

Don [2005-12-10 22:41, CarbuncleHill]

· Starting at 16:40 UT, but awaiting cirrus.

Stefan/Jozef [2005-12-10 17:26, Modra] Message sent to BinAstPhotSurvey conference

· A short run of Dec 9 was clouded out. Attempting a nearly full run tonight (Dec 10 ut). [2005-12-10 03:15, CarbuncleHill]

(56283) 1999 LU1 (Finished) - 2-period object (probable binary) [Add new note]
· Binary suspect, confirmation needed in the future.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-06-30 12:34, Ondrejov]

· Started a run on this at 23:50, Jan 7 UT.
Don [2021-01-08 00:01, Sugarloaf] Message sent to observers

· I started this one at 00:10 UT.
Don [2021-01-03 01:40, Sugarloaf]

· This new target has been observed by Marek Husarik and coll. from Skalnate Pleso and by Don Pray from Sugarloaf Mountain. There appear to be two periods. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/56283_2020a_p1.png
http://www.asu.cas.cz/~asteroid/56283_2020a_p2.png
More data (errors 0.01 mag and long sessions) are needed to nail it down.

Clear Skies, Petr [2020-12-19 12:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 01:30, Dec 19 UT.
Don [2020-12-18 22:26, Sugarloaf]

· I observed this one on Dec 11.
Don [2020-12-12 00:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1934) Jeffers (Finished) - 2-period object (probable binary) [Add new note]
· Probable binary, needs to be confirmed in the future.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-06-30 12:05, Ondrejov]

· The best data set that we obtained for this one in December resolves the two periods. There is also apparent a decrease at the beginning of the December 7.2 run (in both Don's and Russ' data) that looks like an increase from event:
http://www.asu.cas.cz/~asteroid/01934_202012_p1.png
http://www.asu.cas.cz/~asteroid/01934_202012_p2.png
If it is indeed an event, then the orbit period must be substantially longer than the P_2 of 15.01 h.

The previous data taken in October and November also show deviations from the main period of 6.04 h, but solution from them is unclear. It will be needed to take thorough high-quality data in a future favorable apparition to resolve this case uniquely.

Petr [2021-01-27 10:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 01/09, 01/10, 01/11 [2021-01-12 07:50, Blue Mountains Obs] Message sent to observers

· Will start a run at 23:30, Dec 19 UT.
Don [2020-12-18 22:28, Sugarloaf]

· Observing this one from 19 UT.
Marek [2020-12-12 19:49, SkalnatePleso] [Remove]
Message sent to observers

· Planning to start this one at 00:20, Dec 11 UT.
Don [2020-12-10 22:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Will be following this one tonight.

Russ [2020-12-07 01:48, Shed of Science] Message sent to observers

· Extensive observations by Alessandro Marchini and Riccardo Papini and by Don Pray have given a unique solution for the two periods in this one:
http://www.asu.cas.cz/~asteroid/01934_2020a_p1.png
http://www.asu.cas.cz/~asteroid/01934_2020a_p2.png
The second lc component is likely a secondary rotational lc, making this object to be a probable binary asteroid. However, without detecting mutual events, we cannot be sure in the interpretation. Further monitoring would be useful to catch events for a case it moves to event geometry. High quality data with errors of 0.01 mag and long sessions are needed; don't bother in less ideal conditions.

Petr [2020-11-16 12:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've observed this one a few times and will attempt it again tonight, Nov. 9 UT.
Don [2020-11-08 23:19, Sugarloaf]

· This new target has been observed by Alessandro Marchini and Riccardo Papini on four nights from October 17 to 21. Their observations reveal a 6.04-h period with amplitude 0.21 mag, but there appears to be present also a second rotational component with amplitude 0.04 mag. (I will post here plots later on.) Its period is not unique yet, more high-quality (errors 0.01 mag) data are needed. Alessandro and Riccardo would appreciate a help by others here.

Clear Skies, Petr [2020-10-23 11:42, Ondrejov] Message sent to BinAstPhotSurvey conference

(4362) Carlisle (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4987, copied below for your convenience.

Cheers, Petr

(4362) CARLISLE
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia;
A. Marchini and R. Papini, Dipartimento di Scienze Fisiche, Della Terra e
Dell'Ambiente, University of Siena; F. Pilcher, Organ Mesa Observatory, Las
Cruces, NM, U.S.A.; R. Durkee, Shed of Science South Observatory, Pontotoc,
TX, U.S.A.; V. Chiorny, Kharkiv Observatory; R. Montaigut and A. Leroy, OPERA
Observatory, France; and M. Deldem, Les Barres Observatory, Lamanon, France,
report that photometric observations taken with a 0.35-m telescope at the
Sopot Observatory in Serbia, a 0.35-m telescope at the Blue Mountains
Observatory, a 0.30-m telescope at the Astronomical Observatory of the
University of Siena, a 0.35-m telescope at the Organ Mesa Observatory, a
0.50-m telescope at the Shed of Science South Observatory, a 0.70-m telescope
at the Chuguev station of the Kharkiv Observatory in Ukraine, a 0.20-m
telescope at the OPERA Observatory, and a 0.28-m telescope at the Les Barres
Observatory during Mar. 20-June 6 reveal that minor planet (4362) is a binary
system with an orbital period of 43.30 Â± 0.03 hr. The primary shows a
period of 2.63289 Â± 0.00007 hr and has a lightcurve amplitude of 0.11
magnitude at solar phases 1-15 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.11 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.33.

2021 June 23 (CBET 4987) Daniel W. E. Green [2021-06-24 06:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is also ready for a CBET. Our data:
http://www.asu.cas.cz/~asteroid/04362_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04362_2021a_p1.png
http://www.asu.cas.cz/~asteroid/04362_2021b_porb.png
http://www.asu.cas.cz/~asteroid/04362_2021b_p1.png
The mutual events deepened as the apparition progressed (and also the events became W-shaped before the end of the apparition); the system was apparently moving towards more central geometry. So, there may potentially occur even deeper mutual events in the future.

Cheers, Petr [2021-06-21 07:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/04362_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04362_2021a_p1.png
http://www.asu.cas.cz/~asteroid/04362_2021b_porb.png
http://www.asu.cas.cz/~asteroid/04362_2021c_porb.png
http://www.asu.cas.cz/~asteroid/04362_2021c_p1.png

The system is apparently moving from a partial to more central event geometry, and there also appear developing double events. More good quality data (errors < 0.02 mag; don't bother in sub-optimal conditions) are needed before we publish it on CBET. Below is an event ephemeris, but don't limit your observations too narrowly to the predicted mid-event times as the events appear widening.

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5-31 5.62 0.250
2021- 6- 2 0.91 0.250
2021- 6- 3 20.20 0.250
2021- 6- 5 15.49 0.250
2021- 6- 7 10.78 0.250
2021- 6- 9 6.07 0.250
2021- 6-11 1.36 0.250
2021- 6-12 20.65 0.250
2021- 6-14 15.94 0.250
2021- 6-16 11.23 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5-30 7.96 0.750
2021- 6- 1 3.25 0.750
2021- 6- 2 22.54 0.750
2021- 6- 4 17.83 0.750
2021- 6- 6 13.12 0.750
2021- 6- 8 8.41 0.750
2021- 6-10 3.70 0.750
2021- 6-11 22.99 0.750
2021- 6-13 18.28 0.750
2021- 6-15 13.57 0.750

Clear Skies, Petr [2021-05-28 07:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 05/18 to capture the 0.245 phase event [2021-05-19 13:05, Blue Mountains Obs] Message sent to observers

· Observed this one on the past night 15/16 May from 18.5 to 21.5 UT. Vasilij Ch. [2021-05-16 16:03, Kharkiv]

· Marc Deldem covered the primary event on the past night, which led to nailing down the orbital period. Our current data:
http://www.asu.cas.cz/~asteroid/04362_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04362_2021a_p1.png

More high-quality data (errors <= 0.015 mag; don't bother in less ideal conditions) are needed especially for the secondary event. Updated event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5- 7 18.46 0.245
2021- 5- 9 13.74 0.245
2021- 5-11 9.02 0.245
2021- 5-13 4.30 0.245
2021- 5-14 23.58 0.245
2021- 5-16 18.86 0.245
2021- 5-18 14.14 0.245
2021- 5-20 9.42 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5- 6 20.25 0.732
2021- 5- 8 15.53 0.732
2021- 5-10 10.81 0.732
2021- 5-12 6.09 0.732
2021- 5-14 1.37 0.732
2021- 5-15 20.65 0.732
2021- 5-17 15.93 0.732
2021- 5-19 11.21 0.732

Clear Skies, Petr [2021-05-06 08:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Recent observations by Vladimir Benishek and by Alessandro Marchini and colleagues have led to following tentative solution:
http://www.asu.cas.cz/~asteroid/04362_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04362_2021a_p1.png

It is still somewhat weak, more high-quality data (with errors <= 0.015 mag; don't bother in less ideal conditions) are needed. A tentative event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-30 12.35 0.236
2021- 5- 2 7.59 0.236
2021- 5- 4 2.83 0.236
2021- 5- 5 22.07 0.236
2021- 5- 7 17.31 0.236
2021- 5- 9 12.55 0.236
2021- 5-11 7.79 0.236
2021- 5-13 3.03 0.236
2021- 5-14 22.27 0.236
2021- 5-16 17.51 0.236
2021- 5-18 12.75 0.236
2021- 5-20 7.99 0.236

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5- 1 10.16 0.740
2021- 5- 3 5.40 0.740
2021- 5- 5 0.64 0.740
2021- 5- 6 19.88 0.740
2021- 5- 8 15.12 0.740
2021- 5-10 10.36 0.740
2021- 5-12 5.60 0.740
2021- 5-14 0.84 0.740
2021- 5-15 20.08 0.740
2021- 5-17 15.32 0.740
2021- 5-19 10.56 0.740

Clear Skies, Petr [2021-04-28 07:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working this one again tonight.
Vladimir [2021-03-25 02:21, Sopot AO]

· I will start on this one later tonight.

Russ [2021-03-24 02:39, Shed of Science] Message sent to observers

· Vladimir Benishek has observed this off-list target from Sopot, supported by Russ Durkee from Shed of Science South. He has found it to be a binary suspect. A very tentative lc decomposition (may be entirely wrong):
http://www.asu.cas.cz/~asteroid/04362_2021a_porb.png
http://www.asu.cas.cz/~asteroid/04362_2021a_p1.png

More good-quality data (errors < 0.015 mag) are needed to confirm.

Clear Skies, Petr [2021-03-22 14:05, Ondrejov] Message sent to BinAstPhotSurvey conference

(7792) 1995 WZ3 (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4982, copied below for your convenience.

Cheers, Petr

(7792) 1995 WZ_3
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; V. Benishek, Belgrade Astronomical
Observatory; M. Deldem, Les Barres Observatory, Lamanon, France; A. Marchini
and R. Papini, Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente,
University of Siena; and R. Durkee, Shed of Science South Observatory,
Pontotoc, TX, U.S.A., report that photometric observations taken with a 0.50-m
telescope at the Sugarloaf Mountain Observatory, a 0.35-m telescope at the
Sopot Observatory in Serbia, a 0.28-m telescope at the Les Barres Observatory,
a 0.30-m telescope at the Astronomical Observatory of the University of Siena,
and a 0.50-m telescope at the Shed of Science South Observatory during 2021
Mar. 14-May 14 reveal that minor planet (7792) is a binary system with an
orbital period of 19.210 Â± 0.005 hr. The primary shows a period of 3.15996
Â± 0.00012 hr and has a lightcurve amplitude of 0.21 mag at solar phases 6-7
degrees. Mutual eclipse/occultation events that are 0.07 to 0.13 magnitude
deep indicate a secondary-to-primary mean-diameter ratio of 0.26 Â± 0.02.

2021 June 20 (CBET 4982) Daniel W. E. Green [2021-06-21 07:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for a CBET. Our data:
http://www.asu.cas.cz/~asteroid/07792_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021a_p1.png
http://www.asu.cas.cz/~asteroid/07792_2021b_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021b_p1.png

Cheers, Petr [2021-06-17 07:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/07792_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021a_p1.png
http://www.asu.cas.cz/~asteroid/07792_2021b_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021b_p1.png

It would be good to take more high-quality (errors <= 0.015 mag) data to monitor the developing events before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5-30 7.10 0.250
2021- 5-31 2.31 0.250
2021- 5-31 21.52 0.250
2021- 6- 1 16.73 0.250
2021- 6- 2 11.94 0.250
2021- 6- 3 7.15 0.250
2021- 6- 4 2.36 0.250
2021- 6- 4 21.57 0.250
2021- 6- 5 16.78 0.250
2021- 6- 6 11.99 0.250
2021- 6- 7 7.20 0.250
2021- 6- 8 2.41 0.250
2021- 6- 8 21.62 0.250
2021- 6- 9 16.83 0.250
2021- 6-10 12.04 0.250
2021- 6-11 7.25 0.250
2021- 6-12 2.46 0.250
2021- 6-12 21.67 0.250
2021- 6-13 16.88 0.250
2021- 6-14 12.09 0.250
2021- 6-15 7.30 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 5-29 21.48 0.750
2021- 5-30 16.69 0.750
2021- 5-31 11.90 0.750
2021- 6- 1 7.11 0.750
2021- 6- 2 2.32 0.750
2021- 6- 2 21.53 0.750
2021- 6- 3 16.74 0.750
2021- 6- 4 11.95 0.750
2021- 6- 5 7.16 0.750
2021- 6- 6 2.37 0.750
2021- 6- 6 21.58 0.750
2021- 6- 7 16.79 0.750
2021- 6- 8 12.00 0.750
2021- 6- 9 7.21 0.750
2021- 6-10 2.42 0.750
2021- 6-10 21.63 0.750
2021- 6-11 16.84 0.750
2021- 6-12 12.05 0.750
2021- 6-13 7.26 0.750
2021- 6-14 2.47 0.750
2021- 6-14 21.68 0.750
2021- 6-15 16.89 0.750

Clear Skies, Petr [2021-05-28 09:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/07792_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021a_p1.png
http://www.asu.cas.cz/~asteroid/07792_2021b_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021b_p1.png

It would be good to take more high-quality (errors < 0.015 mag) data to monitor the developing events before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-30 16.33 0.250
2021- 5- 1 11.54 0.250
2021- 5- 2 6.75 0.250
2021- 5- 3 1.96 0.250
2021- 5- 3 21.17 0.250
2021- 5- 4 16.38 0.250
2021- 5- 5 11.59 0.250
2021- 5- 6 6.80 0.250
2021- 5- 7 2.01 0.250
2021- 5- 7 21.22 0.250
2021- 5- 8 16.43 0.250
2021- 5- 9 11.64 0.250
2021- 5-10 6.85 0.250
2021- 5-11 2.06 0.250
2021- 5-11 21.27 0.250
2021- 5-12 16.48 0.250
2021- 5-13 11.69 0.250
2021- 5-14 6.90 0.250
2021- 5-15 2.11 0.250
2021- 5-15 21.32 0.250
2021- 5-16 16.53 0.250
2021- 5-17 11.74 0.250
2021- 5-18 6.95 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-30 6.71 0.750
2021- 5- 1 1.92 0.750
2021- 5- 1 21.13 0.750
2021- 5- 2 16.34 0.750
2021- 5- 3 11.55 0.750
2021- 5- 4 6.76 0.750
2021- 5- 5 1.97 0.750
2021- 5- 5 21.18 0.750
2021- 5- 6 16.39 0.750
2021- 5- 7 11.60 0.750
2021- 5- 8 6.81 0.750
2021- 5- 9 2.02 0.750
2021- 5- 9 21.23 0.750
2021- 5-10 16.44 0.750
2021- 5-11 11.65 0.750
2021- 5-12 6.86 0.750
2021- 5-13 2.07 0.750
2021- 5-13 21.28 0.750
2021- 5-14 16.49 0.750
2021- 5-15 11.70 0.750
2021- 5-16 6.91 0.750
2021- 5-17 2.12 0.750
2021- 5-17 21.33 0.750
2021- 5-18 16.54 0.750

Clear Skies, Petr [2021-04-20 13:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning a run on this on Apr 4 to catch the 0.248 event.
Don [2021-04-03 19:48, Sugarloaf]

· Two nights by Marc Deldem joined in. Current solution:
http://www.asu.cas.cz/~asteroid/07792_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021a_p1.png

Just two more high-quality (errors < 0.015 mag) runs, one for each of the two events, are needed to take in the next lunation, to refine the solution. We will do a CBET report on it then. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 1 1.56 0.248
2021- 4- 1 20.77 0.248
2021- 4- 2 15.98 0.248
2021- 4- 3 11.19 0.248
2021- 4- 4 6.40 0.248
2021- 4- 5 1.61 0.248
2021- 4- 5 20.82 0.248
2021- 4- 6 16.03 0.248
2021- 4- 7 11.24 0.248
2021- 4- 8 6.45 0.248
2021- 4- 9 1.66 0.248
2021- 4- 9 20.87 0.248
2021- 4-10 16.08 0.248
2021- 4-11 11.29 0.248
2021- 4-12 6.50 0.248
2021- 4-13 1.71 0.248
2021- 4-13 20.92 0.248
2021- 4-14 16.13 0.248
2021- 4-15 11.34 0.248
2021- 4-16 6.55 0.248
2021- 4-17 1.76 0.248
2021- 4-17 20.97 0.248
2021- 4-18 16.18 0.248
2021- 4-19 11.39 0.248
2021- 4-20 6.60 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 1 11.12 0.746
2021- 4- 2 6.33 0.746
2021- 4- 3 1.54 0.746
2021- 4- 3 20.75 0.746
2021- 4- 4 15.96 0.746
2021- 4- 5 11.17 0.746
2021- 4- 6 6.38 0.746
2021- 4- 7 1.59 0.746
2021- 4- 7 20.80 0.746
2021- 4- 8 16.01 0.746
2021- 4- 9 11.22 0.746
2021- 4-10 6.43 0.746
2021- 4-11 1.64 0.746
2021- 4-11 20.85 0.746
2021- 4-12 16.06 0.746
2021- 4-13 11.27 0.746
2021- 4-14 6.48 0.746
2021- 4-15 1.69 0.746
2021- 4-15 20.90 0.746
2021- 4-16 16.11 0.746
2021- 4-17 11.32 0.746
2021- 4-18 6.53 0.746
2021- 4-19 1.74 0.746
2021- 4-19 20.95 0.746
2021- 4-20 16.16 0.746

Clear Skies, Petr [2021-03-25 09:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this one by Don Pray from Sugarloaf Mountain, by Alessandro Marchini and his colleagues/students from Siena, and by Fabio Salvaggio from WBRO. Current solution:
http://www.asu.cas.cz/~asteroid/07792_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021a_p1.png

Just a few more high-quality sessions may do it sufficiently for a CBET. Data with errors <= 0.015 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-24 20.56 0.250
2021- 4- 1 1.27 0.250
2021- 4- 1 20.46 0.250
2021- 4- 2 15.65 0.250
2021- 4- 3 10.84 0.250
2021- 4- 4 6.03 0.250
2021- 4- 5 1.22 0.250
2021- 4- 5 20.41 0.250
2021- 4- 6 15.60 0.250
2021- 4- 7 10.79 0.250
2021- 4- 8 5.98 0.250
2021- 4- 9 1.17 0.250
2021- 4- 9 20.36 0.250
2021- 4-10 15.55 0.250
2021- 4-11 10.74 0.250
2021- 4-12 5.93 0.250
2021- 4-13 1.12 0.250
2021- 4-13 20.31 0.250
2021- 4-14 15.50 0.250
2021- 4-15 10.69 0.250
2021- 4-16 5.88 0.250
2021- 4-17 1.07 0.250
2021- 4-17 20.26 0.250
2021- 4-18 15.45 0.250
2021- 4-19 10.64 0.250
2021- 4-20 5.83 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-25 6.15 0.750
2021- 4- 1 10.86 0.750
2021- 4- 2 6.05 0.750
2021- 4- 3 1.24 0.750
2021- 4- 3 20.43 0.750
2021- 4- 4 15.62 0.750
2021- 4- 5 10.81 0.750
2021- 4- 6 6.00 0.750
2021- 4- 7 1.19 0.750
2021- 4- 7 20.38 0.750
2021- 4- 8 15.57 0.750
2021- 4- 9 10.76 0.750
2021- 4-10 5.95 0.750
2021- 4-11 1.14 0.750
2021- 4-11 20.33 0.750
2021- 4-12 15.52 0.750
2021- 4-13 10.71 0.750
2021- 4-14 5.90 0.750
2021- 4-15 1.09 0.750
2021- 4-15 20.28 0.750
2021- 4-16 15.47 0.750
2021- 4-17 10.66 0.750
2021- 4-18 5.85 0.750
2021- 4-19 1.04 0.750
2021- 4-19 20.23 0.750
2021- 4-20 15.42 0.750

Clear Skies, Petr [2021-03-24 15:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will be starting this one now hoping to catch the end of the 0.25 event.

Russ [2021-03-24 02:39, Shed of Science] Message sent to observers

· Don Pray has observed this return "prime suspect" from Sugarloaf Mountain on past nights, found it to be a binary. A likely solution:
http://www.asu.cas.cz/~asteroid/07792_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07792_2021a_p1.png

It needs to be nailed down. High-quality data with errors <= 0.015 mag will be useful; don't bother in sub-optimal conditions. A tentative event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-22 11.10 0.250
2021- 3-23 6.31 0.250
2021- 3-24 1.52 0.250
2021- 3-24 20.73 0.250
2021- 4- 2 16.04 0.250
2021- 4- 3 11.25 0.250
2021- 4- 4 6.46 0.250
2021- 4- 5 1.67 0.250
2021- 4- 5 20.88 0.250
2021- 4- 6 16.09 0.250
2021- 4- 7 11.30 0.250
2021- 4- 8 6.51 0.250
2021- 4- 9 1.72 0.250
2021- 4- 9 20.93 0.250
2021- 4-10 16.14 0.250
2021- 4-11 11.35 0.250
2021- 4-12 6.56 0.250
2021- 4-13 1.77 0.250
2021- 4-13 20.98 0.250
2021- 4-14 16.19 0.250
2021- 4-15 11.40 0.250
2021- 4-16 6.61 0.250
2021- 4-17 1.82 0.250
2021- 4-17 21.03 0.250
2021- 4-18 16.24 0.250
2021- 4-19 11.45 0.250
2021- 4-20 6.66 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-22 20.60 0.745
2021- 3-23 15.81 0.745
2021- 3-24 11.02 0.745
2021- 3-25 6.23 0.745
2021- 4- 2 6.33 0.745
2021- 4- 3 1.54 0.745
2021- 4- 3 20.75 0.745
2021- 4- 4 15.96 0.745
2021- 4- 5 11.17 0.745
2021- 4- 6 6.38 0.745
2021- 4- 7 1.59 0.745
2021- 4- 7 20.80 0.745
2021- 4- 8 16.01 0.745
2021- 4- 9 11.22 0.745
2021- 4-10 6.43 0.745
2021- 4-11 1.64 0.745
2021- 4-11 20.85 0.745
2021- 4-12 16.06 0.745
2021- 4-13 11.27 0.745
2021- 4-14 6.48 0.745
2021- 4-15 1.69 0.745
2021- 4-15 20.90 0.745
2021- 4-16 16.11 0.745
2021- 4-17 11.32 0.745
2021- 4-18 6.53 0.745
2021- 4-19 1.74 0.745
2021- 4-19 20.95 0.745
2021- 4-20 16.16 0.745

Clear Skies, Petr [2021-03-22 09:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did two sessions on this, Mar 14+16.
Don [2021-03-17 14:23, Sugarloaf]

· This one has been done well by Oleg from Andrushivka on three nights: Unique period, good coverage, no significant deviation seen. It is done for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Oleg.

Cheers, Petr [2007-05-09 12:11, Ondrejov] Message sent to BinAstPhotSurvey conference

(100045) 1991 TK1 (Finished) [Add new note]
· Unsuccessful observing attempt. [2021-06-19 09:29, Ondrejov]

· This new target was observed by Hana Kucakova and Kamil Hornoch from here on 2020-11-24. It was a supplementary target to our primary target of the night. Their 3-h long run showed a continuous increase of brightness by 0.05 mag. We will be busy with our other targets after the Full Moon so we cannot continue this target soon. If someone here could take over the target, it would be great.

Clear Skies, Petr [2020-11-25 13:10, Ondrejov] Message sent to BinAstPhotSurvey conference

(3892) Dezso (Finished) [Add new note]
· Don Pray observed this return binary suspect from Sugarloaf Mountain recently. Like in 2017, there are apparent deviations again, but the data are too limited to draw a conclusion on its suspected binarity. A confirmation with thorough and high quality data waits for a future.
http://www.asu.cas.cz/~asteroid/03892_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-06-08 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm planning to run this tonight, Apr 4, 03:45 UT.
Don [2021-04-03 19:51, Sugarloaf]

· Started this prime suspect Mar 22 and will run it again on Mar23.
Don [2021-03-22 23:53, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Despite an extensive effort, the drop seen in the last 7 points of the 2017-05-23.1 session was not confirmed.
http://www.asu.cas.cz/~asteroid/03892.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-07-11 10:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 22:10 UT. Gabo [2017-06-15 22:16, SkalnatePleso] [Remove]
Message sent to observers

· observed on 05/28, 05/29, 05/30, 05/31, 06/01, 06/02, and 06/03. most are 4 hours duration but 05/29 is for 6 hours.(14HD) [2017-06-04 08:54, Blue Mountains Obs]

· Observed from Siena for 4 nights, only 3 with good quality data (May 25, 26, 27). Sending data in minutes. Alessandro [2017-05-29 22:22, Univ-Siena IT] Message sent to observers

· I got another session on this one last night (May 28-29, 19:32-01:30 UT).
Vladimir [2017-05-29 12:21, Sopot AO]

· Observed last night (May 27-28, 19:46-01:31 UT).
Vladimir [2017-05-28 14:03, Sopot AO] Message sent to observers

· observed on 05/25 and 05/27 with 14HD [2017-05-28 05:17, Blue Mountains Obs]

· I obsrved the asteroid 3892 26/27 and started today.
Nelya. [2017-05-27 19:50, Simeiz] Message sent to observers

· I just start a run on this suspect target but there is a lot of background stars.
Romain [2017-05-23 21:29, OPERA]

· This new target has been observed by Amadeo Aznar, by Don Pray from Sugarloaf Mountain, and by Peter Kusnirak from here. While we have got an apparently unique period solution (though the coverage of the period needs to be improved), the last seven points of the last session show a decrease. See
http://www.asu.cas.cz/~asteroid/03892.png
http://www.asu.cas.cz/~asteroid/03982_20170523.png
Amadeo sees no problem with the data points.

I encourage others here to help out with this suspect.

Clear Skies, Petr [2017-05-23 11:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a new run of 3892 Dezco on 20th at 01:00 UT. [2017-05-20 09:12, IAO-Isaac Aznar Obs.] Message sent to observers

· Observed this target from 22:40 UT. Gabo [2017-05-20 01:19, SkalnatePleso] [Remove]

· I did a run on this new target on May 16.
Don [2017-05-17 02:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

(7307) Takei (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4970, copied below for your convenience.

Cheers, Petr

(7307) TAKEI
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; M. Husarik, M. Pikler, and G. Cervak, Skalnate Pleso Observatory;
R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; and V.
Chiorny, Kharkiv Observatory, report that photometric observations taken with
a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.61-m telescope at
the Skalnate Pleso Observatory, a 0.50-m telescope at the Shed of Science
South Observatory, and a 0.70-m telescope at the Chuguev station of the
Kharkiv Observatory in Ukraine during Mar. 7-May 10 reveal that minor planet
(7307) is a binary system with an orbital period of 20.007 Â± 0.003 hr. The
primary shows a period of 2.74685 Â± 0.00006 hr and has a light-curve
amplitude of 0.19 magnitude at solar phases 3-18 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.06 to 0.12
magnitude deep indicate a lower limit on the secondary-to-primary mean-
diameter ratio of 0.24. The secondary appears synchronous and has a
light-curve amplitude (in the combined primary plus secondary light curve) of
0.05 mag, suggesting an elongated shape.

2021 May 30 (CBET 4970) Daniel W. E. Green [2021-05-31 06:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is also ready for a CBET. Our data:
http://www.asu.cas.cz/~asteroid/07307_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07307_2021a_p1.png

Cheers, Petr [2021-05-27 13:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on May 10 from 19 UT.
- Marek [2021-05-11 08:33, SkalnatePleso] [Remove]
Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/07307_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07307_2021a_p1.png

One more high-quality (errors < 0.015 mag) session for the secondary event in particular is needed to refine the size ratio before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-30 1.23 0.255
2021- 4-30 21.24 0.255
2021- 5- 1 17.25 0.255
2021- 5- 2 13.26 0.255
2021- 5- 3 9.27 0.255
2021- 5- 4 5.28 0.255
2021- 5- 5 1.29 0.255
2021- 5- 5 21.30 0.255
2021- 5- 6 17.31 0.255
2021- 5- 7 13.32 0.255
2021- 5- 8 9.33 0.255
2021- 5- 9 5.34 0.255
2021- 5-10 1.35 0.255
2021- 5-10 21.36 0.255
2021- 5-11 17.37 0.255
2021- 5-12 13.38 0.255
2021- 5-13 9.39 0.255
2021- 5-14 5.40 0.255
2021- 5-15 1.41 0.255
2021- 5-15 21.42 0.255
2021- 5-16 17.43 0.255
2021- 5-17 13.44 0.255
2021- 5-18 9.45 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-30 11.23 0.755
2021- 5- 1 7.24 0.755
2021- 5- 2 3.25 0.755
2021- 5- 2 23.26 0.755
2021- 5- 3 19.27 0.755
2021- 5- 4 15.28 0.755
2021- 5- 5 11.29 0.755
2021- 5- 6 7.30 0.755
2021- 5- 7 3.31 0.755
2021- 5- 7 23.32 0.755
2021- 5- 8 19.33 0.755
2021- 5- 9 15.34 0.755
2021- 5-10 11.35 0.755
2021- 5-11 7.36 0.755
2021- 5-12 3.37 0.755
2021- 5-12 23.38 0.755
2021- 5-13 19.39 0.755
2021- 5-14 15.40 0.755
2021- 5-15 11.41 0.755
2021- 5-16 7.42 0.755
2021- 5-17 3.43 0.755
2021- 5-17 23.44 0.755
2021- 5-18 19.45 0.755

Clear Skies, Petr [2021-04-20 14:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying for the 0.76 event tonight.

Russ [2021-04-11 02:50, Shed of Science] Message sent to observers

· Starting a run on this one hoping to capture the 0.262 event.
Russ [2021-04-08 02:03, Shed of Science]

· I hope that last night helped to improve the result :)
- Marek [2021-04-05 09:29, SkalnatePleso] [Remove]
Message sent to observers

· Vladimir got another coverage for the primary event from Sopot on the past night. Current solution:
http://www.asu.cas.cz/~asteroid/07307_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07307_2021a_p1.png

The orbit period is nailed down well now. We need to complete it with one high-quality (errors < 0.015 mag) session for the secondary event, to refine the size ratio. Then we will do a CBET on this one. Updated event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 1 16.88 0.262
2021- 4- 2 12.89 0.262
2021- 4- 3 8.90 0.262
2021- 4- 4 4.91 0.262
2021- 4- 5 0.92 0.262
2021- 4- 5 20.93 0.262
2021- 4- 6 16.94 0.262
2021- 4- 7 12.95 0.262
2021- 4- 8 8.96 0.262
2021- 4- 9 4.97 0.262
2021- 4-10 0.98 0.262
2021- 4-10 20.99 0.262
2021- 4-11 17.00 0.262
2021- 4-12 13.01 0.262
2021- 4-13 9.02 0.262
2021- 4-14 5.03 0.262
2021- 4-15 1.04 0.262
2021- 4-15 21.05 0.262
2021- 4-16 17.06 0.262
2021- 4-17 13.07 0.262
2021- 4-18 9.08 0.262
2021- 4-19 5.09 0.262
2021- 4-20 1.10 0.262
2021- 4-20 21.11 0.262
2021- 4-21 17.12 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 2 2.86 0.760
2021- 4- 2 22.87 0.760
2021- 4- 3 18.88 0.760
2021- 4- 4 14.89 0.760
2021- 4- 5 10.90 0.760
2021- 4- 6 6.91 0.760
2021- 4- 7 2.92 0.760
2021- 4- 7 22.93 0.760
2021- 4- 8 18.94 0.760
2021- 4- 9 14.95 0.760
2021- 4-10 10.96 0.760
2021- 4-11 6.97 0.760
2021- 4-12 2.98 0.760
2021- 4-12 22.99 0.760
2021- 4-13 19.00 0.760
2021- 4-14 15.01 0.760
2021- 4-15 11.02 0.760
2021- 4-16 7.03 0.760
2021- 4-17 3.04 0.760
2021- 4-17 23.05 0.760
2021- 4-18 19.06 0.760
2021- 4-19 15.07 0.760
2021- 4-20 11.08 0.760
2021- 4-21 7.09 0.760

Clear Skies, Petr [2021-04-01 10:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this one by Vladimir Benishek from Sopot, by Marek Husarik from Skalnate Pleso, and by Vasilij Chiorny from Kharkiv. Current solution:
http://www.asu.cas.cz/~asteroid/07307_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07307_2021a_p1.png

Just two high-quality (errors <= 0.015 mag) sessions, one for each of the two events, could refine the solution sufficiently for a CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 1 19.19 0.250
2021- 4- 2 15.29 0.250
2021- 4- 3 11.39 0.250
2021- 4- 4 7.49 0.250
2021- 4- 5 3.59 0.250
2021- 4- 5 23.69 0.250
2021- 4- 6 19.79 0.250
2021- 4- 7 15.89 0.250
2021- 4- 8 11.99 0.250
2021- 4- 9 8.09 0.250
2021- 4-10 4.19 0.250
2021- 4-11 0.29 0.250
2021- 4-11 20.39 0.250
2021- 4-12 16.49 0.250
2021- 4-13 12.59 0.250
2021- 4-14 8.69 0.250
2021- 4-15 4.79 0.250
2021- 4-16 0.89 0.250
2021- 4-16 20.99 0.250
2021- 4-17 17.09 0.250
2021- 4-18 13.19 0.250
2021- 4-19 9.29 0.250
2021- 4-20 5.39 0.250
2021- 4-21 1.49 0.250
2021- 4-21 21.59 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 1 9.23 0.755
2021- 4- 2 5.33 0.755
2021- 4- 3 1.43 0.755
2021- 4- 3 21.53 0.755
2021- 4- 4 17.63 0.755
2021- 4- 5 13.73 0.755
2021- 4- 6 9.83 0.755
2021- 4- 7 5.93 0.755
2021- 4- 8 2.03 0.755
2021- 4- 8 22.13 0.755
2021- 4- 9 18.23 0.755
2021- 4-10 14.33 0.755
2021- 4-11 10.43 0.755
2021- 4-12 6.53 0.755
2021- 4-13 2.63 0.755
2021- 4-13 22.73 0.755
2021- 4-14 18.83 0.755
2021- 4-15 14.93 0.755
2021- 4-16 11.03 0.755
2021- 4-17 7.13 0.755
2021- 4-18 3.23 0.755
2021- 4-18 23.33 0.755
2021- 4-19 19.43 0.755
2021- 4-20 15.53 0.755

Clear Skies, Petr [2021-03-26 08:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· I am observing this one as well tonight.
Vladimir [2021-03-25 02:25, Sopot AO]

· Observed on March 10 from 22:20 UT.
- Marek [2021-03-11 15:34, SkalnatePleso] [Remove]
Message sent to observers

· Vladimir catched another event in this one. A preferred solution (still somewhat weak):
http://www.asu.cas.cz/~asteroid/07307_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07307_2021a_p1.png

More data (with errors < 0.02 mag) are needed. A tentative event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-11 20.69 0.250
2021- 3-12 16.79 0.250
2021- 3-13 12.89 0.250
2021- 3-14 8.99 0.250
2021- 3-15 5.09 0.250
2021- 3-16 1.19 0.250
2021- 3-16 21.29 0.250
2021- 3-17 17.39 0.250
2021- 3-18 13.49 0.250
2021- 3-19 9.59 0.250
2021- 3-20 5.69 0.250
2021- 3-21 1.79 0.250
2021- 3-21 21.89 0.250
2021- 3-22 17.99 0.250
2021- 3-23 14.09 0.250
2021- 3-24 10.19 0.250
2021- 3-25 6.29 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-12 6.83 0.755
2021- 3-13 2.93 0.755
2021- 3-13 23.03 0.755
2021- 3-14 19.13 0.755
2021- 3-15 15.23 0.755
2021- 3-16 11.33 0.755
2021- 3-17 7.43 0.755
2021- 3-18 3.53 0.755
2021- 3-18 23.63 0.755
2021- 3-19 19.73 0.755
2021- 3-20 15.83 0.755
2021- 3-21 11.93 0.755
2021- 3-22 8.03 0.755
2021- 3-23 4.13 0.755
2021- 3-24 0.23 0.755
2021- 3-24 20.33 0.755
2021- 3-25 16.43 0.755

Clear Skies, Petr [2021-03-11 14:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another off-list target observed by Vladimir Benishek from Sopot that shows deviations suggesting possible binarity. A very tentative lc decomposition (may be completely wrong):
http://www.asu.cas.cz/~asteroid/07307_2021a_porb.png
http://www.asu.cas.cz/~asteroid/07307_2021a_p1.png

Vladimir says that his weather forecast for following nights is not very good and he would appreciate a help by others with this one. Long sessions with errors not greater than 0.02 mag are needed.

Clear Skies, Petr [2021-03-10 14:52, Ondrejov] Message sent to BinAstPhotSurvey conference

(3523) Arina (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4967, copied below for your convenience.

Cheers, Petr

(3523) ARINA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; M. Husarik, M. Pikler, and G. Cervak, Skalnate Pleso Observatory;
A. Marchini, Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente,
University of Siena; R. Papini and F. Salvaggio, Wild Boar Remote Observatory,
Florence, Italy; W. Cooney, Starry Night Observatory, Columbus, TX, U.S.A.; A.
Aznar, Isaac Aznar Observatory, Alcublas, Valencia, Spain; P. Santos-Sanz, A.
Sota, and F. J. Aceituno, Instituto de Astrofisica de Andalucia (IAA), CSIC,
Granada, Spain; R. Goncalves, Instituto Politecnico de Tomar (IPT), Portugal;
and R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A., report
that photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.61-m telescope at the Skalnate Pleso Observatory,
a 0.30-m telescope at the Astronomical Observatory of the University of Siena,
a 0.23-m telescope at the Wild Boar Remote Observatory, a 0.50-m telescope at
the Starry Night Observatory, a 0.90-m telescope at the Sierra Nevada
Observatory of the IAA, a 0.35-m telescope at the IPT's Linhaceira
Observatory, and a 0.50-m telescope at the Shed of Science South Observatory
during Mar. 2-May 16 reveal that minor planet (3523) is a binary system with
an orbital period of 29.26 Â± 0.02 hr. The primary shows a period of 2.6742
Â± 0.0001 hr and has a lightcurve amplitude of 0.08 magnitude at solar
phases 9-13 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/
occultation events that are 0.06 magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.24.

2021 May 27 (CBET 4967) Daniel W. E. Green [2021-05-27 13:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for a CBET. Our data:
http://www.asu.cas.cz/~asteroid/03523_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021a_p1.png
http://www.asu.cas.cz/~asteroid/03523_2021b_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021b_p1.png
http://www.asu.cas.cz/~asteroid/03523_2021c_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021c_p1.png

Cheers, Petr [2021-05-19 10:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on May 9 from 19 UT.
- Marek [2021-05-11 08:32, SkalnatePleso] [Remove]
Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/03523_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021a_p1.png
http://www.asu.cas.cz/~asteroid/03523_2021b_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021b_p1.png

It would be good to take more high-quality (errors 0.01 mag) to monitor the developing events before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-30 18.62 0.247
2021- 5- 1 23.88 0.247
2021- 5- 3 5.14 0.247
2021- 5- 4 10.40 0.247
2021- 5- 5 15.66 0.247
2021- 5- 6 20.92 0.247
2021- 5- 8 2.18 0.247
2021- 5- 9 7.44 0.247
2021- 5-10 12.70 0.247
2021- 5-11 17.96 0.247
2021- 5-12 23.22 0.247
2021- 5-14 4.48 0.247
2021- 5-15 9.74 0.247
2021- 5-16 15.00 0.247
2021- 5-17 20.26 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4-30 3.92 0.745
2021- 5- 1 9.18 0.745
2021- 5- 2 14.44 0.745
2021- 5- 3 19.70 0.745
2021- 5- 5 0.96 0.745
2021- 5- 6 6.22 0.745
2021- 5- 7 11.48 0.745
2021- 5- 8 16.74 0.745
2021- 5- 9 22.00 0.745
2021- 5-11 3.26 0.745
2021- 5-12 8.52 0.745
2021- 5-13 13.78 0.745
2021- 5-14 19.04 0.745
2021- 5-16 0.30 0.745
2021- 5-17 5.56 0.745

Clear Skies, Petr [2021-04-20 13:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will try to start a run on this one shortly to observe the 0.755 event at 5.27

Russ [2021-04-08 02:01, Shed of Science] Message sent to observers

· Recent data by Marek Husarik and coll. from Skalnate Pleso suggests that there develops a "double event" at the current increasing solar phase, see the tentative lc decomposition (the "b" plots below):
http://www.asu.cas.cz/~asteroid/03523_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021a_p1.png
http://www.asu.cas.cz/~asteroid/03523_2021b_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021b_p1.png

We need to confirm it with more high-quality data (errors 0.01 mag). Below is an updated event ephemeris, but don't confine your observations too narrowly around the predicted event times as the events appear quite wide recently.

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 7 14.66 0.255
2021- 4- 8 19.91 0.255
2021- 4-10 1.16 0.255
2021- 4-11 6.41 0.255
2021- 4-12 11.66 0.255
2021- 4-13 16.91 0.255
2021- 4-14 22.16 0.255
2021- 4-16 3.41 0.255
2021- 4-17 8.66 0.255
2021- 4-18 13.91 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 8 5.27 0.755
2021- 4- 9 10.52 0.755
2021- 4-10 15.77 0.755
2021- 4-11 21.02 0.755
2021- 4-13 2.27 0.755
2021- 4-14 7.52 0.755
2021- 4-15 12.77 0.755
2021- 4-16 18.02 0.755
2021- 4-17 23.27 0.755
2021- 4-19 4.52 0.755

Clear Skies, Petr [2021-04-07 10:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hope to include new data for 0.75 phase in last night.
- Marek [2021-04-07 08:46, SkalnatePleso] [Remove]
Message sent to observers

· Just a couple more high-quality (errors 0.01 mag) sessions could do this one sufficiently for a CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 1 12.38 0.254
2021- 4- 2 17.63 0.254
2021- 4- 3 22.88 0.254
2021- 4- 5 4.13 0.254
2021- 4- 6 9.38 0.254
2021- 4- 7 14.63 0.254
2021- 4- 8 19.88 0.254
2021- 4-10 1.13 0.254
2021- 4-11 6.38 0.254
2021- 4-12 11.63 0.254
2021- 4-13 16.88 0.254
2021- 4-14 22.13 0.254
2021- 4-16 3.38 0.254
2021- 4-17 8.63 0.254
2021- 4-18 13.88 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 2 2.48 0.736
2021- 4- 3 7.73 0.736
2021- 4- 4 12.98 0.736
2021- 4- 5 18.23 0.736
2021- 4- 6 23.48 0.736
2021- 4- 8 4.73 0.736
2021- 4- 9 9.98 0.736
2021- 4-10 15.23 0.736
2021- 4-11 20.48 0.736
2021- 4-13 1.73 0.736
2021- 4-14 6.98 0.736
2021- 4-15 12.23 0.736
2021- 4-16 17.48 0.736
2021- 4-17 22.73 0.736
2021- 4-19 3.98 0.736

Clear Skies, Petr [2021-03-23 10:03, Ondrejov]

· More data taken for this one by Vladimir Benishek from Sopot, by Amadeo Aznar from Sierra Nevada Observatory, and by Rui Goncalves from Linhaceira. Updated solution:
http://www.asu.cas.cz/~asteroid/03523_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021a_p1.png

Just a couple more high-quality (errors 0.01 mag) sessions could do it sufficiently for a CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-15 11.17 0.260
2021- 3-16 16.46 0.260
2021- 3-17 21.75 0.260
2021- 3-19 3.04 0.260
2021- 3-20 8.33 0.260
2021- 3-21 13.62 0.260
2021- 3-22 18.91 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-16 1.29 0.742
2021- 3-17 6.58 0.742
2021- 3-18 11.87 0.742
2021- 3-19 17.16 0.742
2021- 3-20 22.45 0.742
2021- 3-22 3.74 0.742

Clear Skies, Petr [2021-03-15 11:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· 3523 Arina worked last nigth with T90 during 3 hours. [2021-03-13 12:27, IAO-Isaac Aznar Obs.] Message sent to observers

· Observations by Alessandro Marchini, Riccardo Papini and Fabio Salvagio and by Walt Cooney joined in. An updated solution:
http://www.asu.cas.cz/~asteroid/03523_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021a_p1.png

More data (errors 0.01 mag) are needed to nail down the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-10 14.34 0.255
2021- 3-11 19.74 0.255
2021- 3-13 1.14 0.255
2021- 3-14 6.54 0.255
2021- 3-15 11.94 0.255
2021- 3-16 17.34 0.255
2021- 3-17 22.74 0.255
2021- 3-19 4.14 0.255
2021- 3-20 9.54 0.255
2021- 3-21 14.94 0.255
2021- 3-22 20.34 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-11 4.94 0.752
2021- 3-12 10.34 0.752
2021- 3-13 15.74 0.752
2021- 3-14 21.14 0.752
2021- 3-16 2.54 0.752
2021- 3-17 7.94 0.752
2021- 3-18 13.34 0.752
2021- 3-19 18.74 0.752
2021- 3-21 0.14 0.752
2021- 3-22 5.54 0.752

Clear Skies, Petr [2021-03-10 07:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working from Columbus, TX tonight. -Walt [2021-03-08 01:32, Sonoita] Message sent to observers

· Vladimir has covered another event in this one. Current lc decomposition (solution still a bit weak):
http://www.asu.cas.cz/~asteroid/03523_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021a_p1.png

More data (with errors of 0.01 mag) are needed to nail down it. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3- 8 3.44 0.240
2021- 3- 9 9.00 0.240
2021- 3-10 14.56 0.240
2021- 3-11 20.12 0.240
2021- 3-13 1.68 0.240
2021- 3-14 7.24 0.240
2021- 3-15 12.80 0.240
2021- 3-16 18.36 0.240
2021- 3-17 23.92 0.240
2021- 3-19 5.48 0.240
2021- 3-20 11.04 0.240
2021- 3-21 16.60 0.240
2021- 3-22 22.16 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3- 8 18.29 0.742
2021- 3- 9 23.85 0.742
2021- 3-11 5.41 0.742
2021- 3-12 10.97 0.742
2021- 3-13 16.53 0.742
2021- 3-14 22.09 0.742
2021- 3-16 3.65 0.742
2021- 3-17 9.21 0.742
2021- 3-18 14.77 0.742
2021- 3-19 20.33 0.742
2021- 3-21 1.89 0.742
2021- 3-22 7.45 0.742

Clear Skies, Petr [2021-03-07 15:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir took another session on the past night, captured another event. Their period seems to be 29 h or twice that.
http://www.asu.cas.cz/~asteroid/03523_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03523_2021a_p1.png

A tentative event ephemeris for the shorter P_orb is below. More data (with errors of 0.01 mag) are needed.

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3- 6 6.58 0.246
2021- 3- 7 11.58 0.246
2021- 3- 8 16.58 0.246
2021- 3- 9 21.58 0.246
2021- 3-11 2.58 0.246
2021- 3-12 7.58 0.246
2021- 3-13 12.58 0.246
2021- 3-14 17.58 0.246
2021- 3-15 22.58 0.246
2021- 3-17 3.58 0.246
2021- 3-18 8.58 0.246
2021- 3-19 13.58 0.246
2021- 3-20 18.58 0.246
2021- 3-21 23.58 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3- 5 16.07 0.746
2021- 3- 6 21.07 0.746
2021- 3- 8 2.07 0.746
2021- 3- 9 7.07 0.746
2021- 3-10 12.07 0.746
2021- 3-11 17.07 0.746
2021- 3-12 22.07 0.746
2021- 3-14 3.07 0.746
2021- 3-15 8.07 0.746
2021- 3-16 13.07 0.746
2021- 3-17 18.07 0.746
2021- 3-18 23.07 0.746
2021- 3-20 4.07 0.746
2021- 3-21 9.07 0.746
2021- 3-22 14.07 0.746

Clear Skies, Petr [2021-03-05 13:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot on two nights, found a suspect attenuation. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/03523_2021a_p1.png
http://www.asu.cas.cz/~asteroid/03523_2021a_porb.png
(Note: The period in the 2nd plot above was set just for plotting purpose. There is no real solution for the orbit period yet.)

Vladimir might appreciate a help by others here. Errors 0.01 mag are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2021-03-04 14:49, Ondrejov] Message sent to BinAstPhotSurvey conference

(15989) 1998 XK39 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/15989.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-05-20 14:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(15317) 1993 HW1 (Finished) - prime suspect [Add new note]
· Vladimir Benishek observed this return "prime suspect" from Sopot: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/15317_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Vladimir.

Petr [2021-05-20 14:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don has done this one well from Carbuncle Hill: unique period, good coverage, no significant deviation seen. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don.

Cheers, Petr [2007-04-26 12:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 03:30 UT.
Don [2007-04-25 03:21, CarbuncleHill]

· I'll start this at 03:30 UT, and possibly finish it.
Don [2007-04-23 00:49, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 03:30 UT.
Don [2007-04-22 03:33, CarbuncleHill]

· Starting this tonight.
Don [2007-04-21 01:36, CarbuncleHill]

(3644) Kojitaku (Finished) - prime suspect [Add new note]
· Julian Oey observed this return "prime suspect" from Leura: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03644_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Julian.

Petr [2021-05-20 07:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· continue observation on 15/05 and 15/09 [2021-05-16 02:33, Blue Mountains Obs] Message sent to observers

· starts a new target. observed on 05/07 from 11 UT to 16 UT [2021-05-11 11:29, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Don Pray observed this new target from Sugarloaf Mountain: Good solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03644.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-11-28 07:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this new target on Nov 9.
Don [2019-11-09 21:42, Sugarloaf]

(3390) Demanet (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4956, copied below for your convenience.

Cheers, Petr

(3390) DEMANET
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope
at the Sopot Observatory in Serbia and a 0.50-m telescope at the Shed of
Science South Observatory during Feb. 13-Apr. 10 reveal that minor planet
(3390) is a binary system with an orbital period of 37.14 Â± 0.01 hr. The
primary shows a period of 2.59457 Â± 0.00003 hr and has a lightcurve
amplitude of 0.18 magnitude at solar phases 1-11 degrees, suggesting a
nearly spheroidal shape. Mutual eclipse/occultation events that are 0.07
to 0.14 magnitude deep indicate a secondary-to-primary mean-diameter ratio
of 0.26 Â± 0.02.

2021 April 24 (CBET 4956) Daniel W. E. Green [2021-04-26 09:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for a CBET. Our data:
http://www.asu.cas.cz/~asteroid/03390_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03390_2021a_p1.png
http://www.asu.cas.cz/~asteroid/03390_2021b_porb.png
http://www.asu.cas.cz/~asteroid/03390_2021b_p1.png
http://www.asu.cas.cz/~asteroid/03390_2021c_porb.png

Cheers, Petr [2021-04-21 07:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have time for a shorter run on this one that should cover the 0.250 event.

Russ [2021-04-10 04:06, Shed of Science] Message sent to observers

· High quality data added for this one by Russ Durkee. Current solution:
http://www.asu.cas.cz/~asteroid/03390_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03390_2021a_p1.png
http://www.asu.cas.cz/~asteroid/03390_2021b_porb.png
http://www.asu.cas.cz/~asteroid/03390_2021b_p1.png

Just one more high-quality (errors < 0.015 mag) session for each of the two events would be good to refine the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 2 11.03 0.250
2021- 4- 4 0.18 0.250
2021- 4- 5 13.33 0.250
2021- 4- 7 2.48 0.250
2021- 4- 8 15.63 0.250
2021- 4-10 4.78 0.250
2021- 4-11 17.93 0.250
2021- 4-13 7.08 0.250
2021- 4-14 20.23 0.250
2021- 4-16 9.38 0.250
2021- 4-17 22.53 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 4- 1 16.51 0.752
2021- 4- 3 5.66 0.752
2021- 4- 4 18.81 0.752
2021- 4- 6 7.96 0.752
2021- 4- 7 21.11 0.752
2021- 4- 9 10.26 0.752
2021- 4-10 23.41 0.752
2021- 4-12 12.56 0.752
2021- 4-14 1.71 0.752
2021- 4-15 14.86 0.752
2021- 4-17 4.01 0.752
2021- 4-18 17.16 0.752

Clear Skies, Petr [2021-03-22 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· I am going to try to catch the end of the 0.25 phase event.

Russ [2021-03-21 02:30, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/03390_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03390_2021a_p1.png

Just a couple more high-quality (errors < 0.015 mag) sessions for both events would be good to refine the solution. We'll publish it on CBET then. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-11 18.93 0.250
2021- 3-13 8.08 0.250
2021- 3-14 21.23 0.250
2021- 3-16 10.38 0.250
2021- 3-17 23.53 0.250
2021- 3-19 12.68 0.250
2021- 3-21 1.83 0.250
2021- 3-22 14.98 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3-11 0.41 0.752
2021- 3-12 13.56 0.752
2021- 3-14 2.71 0.752
2021- 3-15 15.86 0.752
2021- 3-17 5.01 0.752
2021- 3-18 18.16 0.752
2021- 3-20 7.31 0.752
2021- 3-21 20.46 0.752

Clear Skies, Petr [2021-03-10 14:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· I am going to try for the 0.25 attenuation tonight.

Russ [2021-03-07 01:06, Shed of Science] Message sent to observers

· I will start a run on this one shortly trying to get the last half of the 0.25 event.

Russ [2021-03-04 01:39, Shed of Science]

· I am running tonight on this one to catch the 0.75 phase event.

Russ [2021-03-03 01:18, Shed of Science] Message sent to observers

· Russ Durkee took another night for this one, covered the primary event. Current solution:
http://www.asu.cas.cz/~asteroid/03390_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03390_2021a_p1.png

Just one more good session (errors < 0.02 mag) for each of the two events is needed to nail down the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3- 2 12.32 0.247
2021- 3- 4 1.52 0.247
2021- 3- 5 14.72 0.247
2021- 3- 7 3.92 0.247
2021- 3- 8 17.12 0.247
2021- 3-10 6.32 0.247
2021- 3-11 19.52 0.247
2021- 3-13 8.72 0.247
2021- 3-14 21.92 0.247
2021- 3-16 11.12 0.247
2021- 3-18 0.32 0.247
2021- 3-19 13.52 0.247
2021- 3-21 2.72 0.247
2021- 3-22 15.92 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3- 3 7.05 0.751
2021- 3- 4 20.25 0.751
2021- 3- 6 9.45 0.751
2021- 3- 7 22.65 0.751
2021- 3- 9 11.85 0.751
2021- 3-11 1.05 0.751
2021- 3-12 14.25 0.751
2021- 3-14 3.45 0.751
2021- 3-15 16.65 0.751
2021- 3-17 5.85 0.751
2021- 3-18 19.05 0.751
2021- 3-20 8.25 0.751
2021- 3-21 21.45 0.751

Clear Skies, Petr [2021-02-25 09:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this one by Vladimir Benishek and by Russ Durkee. A likely solution:
http://www.asu.cas.cz/~asteroid/03390_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03390_2021a_p1.png

More data (errors < 0.02 mag) are needed to nail it down. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3- 2 12.43 0.250
2021- 3- 4 1.63 0.250
2021- 3- 5 14.83 0.250
2021- 3- 7 4.03 0.250
2021- 3- 8 17.23 0.250
2021- 3-10 6.43 0.250
2021- 3-11 19.63 0.250
2021- 3-13 8.83 0.250
2021- 3-14 22.03 0.250
2021- 3-16 11.23 0.250
2021- 3-18 0.43 0.250
2021- 3-19 13.63 0.250
2021- 3-21 2.83 0.250
2021- 3-22 16.03 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2021- 3- 3 7.05 0.751
2021- 3- 4 20.25 0.751
2021- 3- 6 9.45 0.751
2021- 3- 7 22.65 0.751
2021- 3- 9 11.85 0.751
2021- 3-11 1.05 0.751
2021- 3-12 14.25 0.751
2021- 3-14 3.45 0.751
2021- 3-15 16.65 0.751
2021- 3-17 5.85 0.751
2021- 3-18 19.05 0.751
2021- 3-20 8.25 0.751
2021- 3-21 21.45 0.751

Clear Skies, Petr [2021-02-24 08:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will try another run on this one tonight

Russ [2021-02-24 02:40, Shed of Science] Message sent to observers

· I will try a run on this one tonight.

Russ [2021-02-23 01:02, Shed of Science]

· Vladimir Benishek took a fourth night from Sopot for this one, catched another attenuation. A tentative solution (P_orb is far from unique):
http://www.asu.cas.cz/~asteroid/03390_2021a_porb.png
http://www.asu.cas.cz/~asteroid/03390_2021a_p1.png

It seems that Vladimir will need a help from other stations, both for that his winter weather is unstable and that the orbit period appears to be not far from commensurability with Earth's rotation. Observations from America would be particularly useful to solve it. Data with errors not greater than 0.02 mag are needed.

Clear Skies, Petr [2021-02-22 08:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot on three nights, found it to be a binary suspect. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/03390_2021a_p1.png
http://www.asu.cas.cz/~asteroid/03390_2021a_porb.png
(The P_orb value in the second plot above was set just for plotting purpose. There is no real solution for P_orb yet.)

Catching more events is needed to confirm it and establish their period. I encourage others here to help out Vladimir. Data with errors < 0.02 mag are needed.

Clear Skies, Petr [2021-02-16 14:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this one tonight.
Vladimir [2021-02-12 23:20, Sopot AO]

(11696) Capen (Finished) [Add new note]
· Marc Deldem observed this new target on 4 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/11696.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-04-22 07:57, Ondrejov] Message sent to BinAstPhotSurvey conference

(9044) Kaoru (Finished) [Add new note]
· This new target was observed by Vladimir Benishek and by Marc Deldem: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/09044_202103.png
http://www.asu.cas.cz/~asteroid/09044_202104.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Good work, guys.

Petr [2021-04-22 07:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target tonight.
Vladimir [2021-03-25 02:17, Sopot AO]

(6526) Matogawa (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot on 4 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06526.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-04-22 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

(2712) Keaton (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot on 5 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02712.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-04-22 07:49, Ondrejov] Message sent to BinAstPhotSurvey conference

(9721) Doty (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 7 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/09721_2021a.png
http://www.asu.cas.cz/~asteroid/09721_2021b.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-04-22 07:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on Apr 9.
Don [2021-04-10 18:52, Sugarloaf]

· I plan to do a run on this tonight starting at 00:30 UT.
Don [2021-04-03 19:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1563) Noel (Finished) - prime suspect [Add new note]
· This return "prime suspect" was observed in its current apparition by Romain Montaigut and Arnaud Leroy from OPERA: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01563_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-04-22 07:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Closed for the 4th apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian.

Petr [2015-07-02 07:05, Ondrejov]

· observed on 06/26 and 06/27. Apart from the 3/4 moon, condition was very good. [2015-06-27 22:36, Blue Mountains Obs] Message sent to observers

· observed on 06/22 and 06/20 [2015-06-25 13:21, Blue Mountains Obs]

· observed from 13:39 UT 06/19 for 3 hours [2015-06-20 06:26, Blue Mountains Obs]

· start observing new target from 06/14 at 12:36UT for 4 hours. [2015-06-17 04:35, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This return "prime suspect" was done by Don Pray from Sugarloaf Mountain on 7 nights and by Marek Husarik from Skalnate Pleso on 2 nights in its current 3rd apparition: Unique solution, excellent coverage, no significant deviation (one suspect on 12-27.2 was not confirmed):
http://www.asu.cas.cz/~asteroid/01563_13b.png
http://www.asu.cas.cz/~asteroid/01563_13a.png
Target done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-01-02 08:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:10 UT as a secondary target.
Don [2014-01-01 01:11, Sugarloaf] Message sent to observers

· Started a run at 00:20 UT hoping to confirm some suspicious behavior seen in one session.

Don [2013-12-31 00:38, Sugarloaf]

· Started a run at 00:30. Clouds may stop the run in a few hours.
Don [2013-12-29 00:41, Sugarloaf] Message sent to observers

· I started a run at 03:30. Clouds may be problematic.
Don [2013-12-28 03:32, Sugarloaf]

· I started a run on this at 00:50 UT. Hopefully, skies will stay clear.
Don [2013-12-27 02:09, Sugarloaf] Message sent to observers

· Started a run at 02:00 UT.
Don [2013-12-13 02:12, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Jozef Vilagi and Peter Veres took three long sessions of excellent quality for this "prime suspect" from Modra:
http://www.asu.cas.cz/~asteroid/01563_b1.png
Unique solution, multiple coverage, no deviation. It is done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Excellent work, guys.

Cheers, Petr [2011-02-11 08:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from ~20:00 UT. Jozef, Peter. [2011-02-09 20:34, Modra]

· Planning another session tonight, starting ~21:30 UT. conditions are good. Jozef, Peter. [2011-02-08 19:23, Modra]

· Observing this from 21:45 UT in good conditions... so far. Jozef & Peter. [2011-02-07 23:08, Modra]

· Target is finished. [2008-04-07 11:16, Ondrejov]

· Observed from 10:13UT to 15:05UT 2008-04-05. good condition no anomaly. [2008-04-07 06:17, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This target was observed on 3 nights (Apr 3-5) by Julian from Leura Obs. His observations give unique period, no deviations and triple coverage of LC. Well, this target is done.

Nice work, Julian!

Peter [2008-04-06 19:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:13UT to 15:05UT 2008-04-05. good condition no anomaly. [2008-04-05 22:53, Blue Mountains Obs]

· observed from 10:00UT to 16.30UT 2008-04-04. Period refined to 3.5500h +/- 0.0007h [2008-04-05 05:56, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started observation at 10:09UT and finished at 14:23UT 2008-04-03. Period 3.49h with 0.12m amplitude. [2008-04-03 22:26, Blue Mountains Obs]

(00000) Test (Finished) [Add new note]
· Test - please ignore. [2021-04-13 14:19, Ondrejov]

(4794) Bogard (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04794.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-03-18 14:41, Ondrejov] Message sent to BinAstPhotSurvey conference

(4387) Tanaka (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04387.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-03-18 14:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this on Mar. 7.
Don [2021-03-08 01:41, Sugarloaf]

(2273) Yarilo (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02273.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-03-18 14:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(1164) Kobolda (Finished) [Add new note]
· Julian Oey observed this "prime suspect" in its current apparition: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01164_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-03-18 14:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 2.5 nights of this prime suspect. 02/20,02/21 and 02/22 [2021-02-23 11:31, Blue Mountains Obs]

· David has done this one well in its 2nd apparition. A brightness drop for a half of the 3rd night appears to be a cloud-affected artifact, no other deviation seen. Solution in perfect agreement with the 1st apparitions data. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David.

Cheers, Petr [2009-11-14 04:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009-11-13 in good conditions. Period refined to 4.141 +/- 0.001hr, amplitude unchanged. No deviation noted. [2009-11-13 23:29, HuntersHill] Message sent to observers

· Observed target 2009-11-08, 2009-11-09 and 2009-11-10 in fair to poor conditions. Data reveals a period of 4.149 +/- 0.004 hrs with an amplitude of 0.28 +/- 0.03mag. Graph is somewhat noisy and bright stars made identification of faint background stars rather difficult. Some variation in the plots but no obvious deviations. [2009-11-10 21:26, HuntersHill] Message sent to BinAstPhotSurvey conference

· Yes, this one was done well: Unique period, double coverage, no deviation seen. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work.

Cheers, Petr [2007-01-31 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 12:31UT to 18:31UT in good conditions. Data refines the previously determined period to 4.141 +/- 0.002hrs, amplitude of 0.30 +/- 0.01mag. No deviations have been detected and the entire curve has been covered at least twice. [2007-01-31 08:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 28/29th. First session was cut short by scope pointing failure but I got a full second night. Data from both nights reveals a likely period of 4.141 +/- 0.003 hrs with an amplitude of 0.30 +/- 0.01 mag. [2007-01-30 10:16, HuntersHill] Message sent to BinAstPhotSurvey conference

(18640) 1998 EF9 (Finished) [Add new note]
· This new target was observed by Alessandro Marchini and Riccardo Papini from Siena: Good solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/18640.png
Object done for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-03-18 14:31, Ondrejov] Message sent to BinAstPhotSurvey conference

(10037) 1984 BQ (Finished) [Add new note]
· This new target was observed by Vladimir Benishek from Sopot and by Don Pray from Sugarloaf Mountain: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/10037.png
Object done for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-03-18 14:26, Ondrejov] Message sent to BinAstPhotSurvey conference

(106848) 2000 YP16 [Add new note]
[Send data to: peter@asu.cas.cz ]
· I am going to work on this one tonight.

Russ [2021-03-08 01:46, Shed of Science] Message sent to observers

· I did a run on this one last night. I will follow it again starting shortly.

Russ [2021-02-02 01:16, Shed of Science]

· Started on a new target on 01/15 and 01/16 [2021-01-17 08:52, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(4765) Wasserburg (Finished) - Paired Asteroid [Add new note]
· Done for this apparition. Petr [2021-03-05 08:45, Ondrejov]

· Observed in two nights (March 02, 03) in this lunation.
- Marek [2021-03-04 20:53, SkalnatePleso] [Remove]
Message sent to observers

· Done for this apparition. Petr [2018-01-11 08:29, Ondrejov]

· Observed this returning paired asteroid on Dec 17.
Don [2017-12-17 14:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This paired asteroid was done sufficiently by Don Pray from Sugarloaf Mountain, by Julian Oey from Leura and by Joe Pollock with Prompt for this apparition. Showed a much lower amplitude than in the previous apparitions; apparently our current aspect is not far from pole-on. We are going to model it.
http://www.asu.cas.cz/~asteroid/004765_2014a.png
http://www.asu.cas.cz/~asteroid/004765_2014b.png

Good work guys.

Cheers, Petr [2014-11-24 09:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this one from Prompt Tololo at 0100 UT tonight. Joe [2014-11-20 21:17, Dark Sky & PROMPT] Message sent to observers

· observed 11/05 from 13UT for 4.5 hours. [2014-11-06 05:32, Blue Mountains Obs]

· Plan to start this at 03:45 UT.
Don [2014-10-31 01:16, Sugarloaf]

· Plan to start this at 03:50 UT.
Don [2014-10-30 03:15, Sugarloaf] Message sent to observers

· Plan to start this at 03:40 UT. Last night's attempt was ruined by a bright star.
Don [2014-10-28 01:27, Sugarloaf]

· I'm planning to start this one at 04:05 UT.
Don [2014-10-27 01:51, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for this apparition. Petr [2013-06-18 11:21, Ondrejov]

· Don Pray took great data for this return paired asteroid from Sugarloaf Mountain; an interesting lightcurve evolution (likely due to changing asteroid's aspect):
http://www.asu.cas.cz/~asteroid/004765_1305.png
http://www.asu.cas.cz/~asteroid/004765_1304.png
http://www.asu.cas.cz/~asteroid/004765_1303.png

No more data are needed in this lunation. It will be good to observe it again in June.

Cheers, Petr [2013-05-05 14:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 01:00 UT.
Don [2013-05-05 00:41, Sugarloaf]

· Don Pray has taken another good run for this one from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/004765_1304.png
http://www.asu.cas.cz/~asteroid/004765_1303.png

No more data are needed in this lunation. We will observe it again in May.

Cheers, Petr [2013-04-17 06:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:15 UT.
Don [2013-04-15 01:42, Sugarloaf]

· Don Pray has taken one good run for this one from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/004765_b3.png

No more data are needed in this lunation. We will observe it again in following months.

Cheers, Petr [2013-03-13 07:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this last night for about 6 hours.
Don [2013-03-10 14:20, Sugarloaf]

· Starting this at 04:30 UT.
Don [2013-03-09 01:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Very good data from Modra and PDO for this paired asteroid:
http://www.asu.cas.cz/~asteroid/004765_100103_0221.png
http://www.asu.cas.cz/~asteroid/004765_100305_07.png
In agreement with the 2008 data from CTIO 0.9m that we have in our submitted paper on asteroid pairs:
http://www.asu.cas.cz/~asteroid/004765.png
The data will be used in future spin vector and shape modeling. Now I have put the result to my pre-publication web page with summary data
http://www.asu.cas.cz/~ppravec/newres.htm

Cheers, Petr [2010-03-11 13:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 18:00 UT in good sky conditions. Leos [2010-03-07 18:03, Modra] Message sent to observers

· Good data from Modra+PDO taken in January-February:
http://www.asu.cas.cz/~asteroid/004765_b0.png
One full lightcurve in March needed to complete for this apparition.

Clear Skies, Petr [2010-03-04 13:29, Ondrejov]

· Started at 19:15 UT
Peter V. [2010-02-21 19:30, Modra] Message sent to observers

· Ended due to cloud cover at 19:40 UT.

Stefan [2010-02-15 20:36, Modra]

· Observing it from 17:45 UT.

Stefan [2010-02-15 17:57, Modra]

· Started at 19:00 UT. Leos [2010-02-06 20:59, Modra] Message sent to observers

· Observations unsuccessful due to clouds :-( Adrian [2010-02-03 23:31, Modra]

· If the weather permits I can observe this. Adrian [2010-02-03 20:09, Modra] Message sent to observers

· A short attempt before fog, started at 18:40UT on Jan.16.

Stefan [2010-01-16 22:33, Modra] Message sent to BinAstPhotSurvey conference

· Observed from 20:26 UT. It shows a variation larger than 0.5mag and the rotation period could be roughly ~3.5h, which has not been fully covered yet. Jozef, Stefan [2010-01-04 00:21, Modra]

(9368) Esashi (Finished) - prime suspect [Add new note]
· This return "prime suspect" was observed by Don Pray and Russ Durkee in the 3rd apparition: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/09368_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-02-04 13:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this one last night. Sent data to Petr.
Russ [2021-02-04 01:38, Shed of Science] Message sent to observers

· I started this on Dec 23.
Don [2021-01-06 14:09, Sugarloaf] Message sent to BinAstPhotSurvey conference

· David has done this return "prime suspect" in the 2nd apparition, no significant deviation seen. Target done for now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David.

Cheers, Petr [2011-06-13 12:31, Ondrejov] Message sent to observers

· Have tried observing this target over the past 2 weeks in generally poor conditions (Cloud, fog, wind, moon an dstar subtractions). Data has narrowed the period to 2.9196 +/- 0.0004hrs with an amplitude of 0.17 +/- 0.03mag. No deviations detected but the data is noisey and perhaps not suitable for BINAST purposes. [2011-05-31 01:32, HuntersHill] Message sent to observers

· Observed 2011 05 09 from 09:04UT to 18:10UT in less than ideal conditions. Data reveals a period of 2.92h +/- 0.03h with an amplitude of 0.1 +/- 0.02mag. [2011-05-11 03:52, HuntersHill] Message sent to BinAstPhotSurvey conference

· This one was finished by Don Pray after 4 nights (Jan 18 -- Feb 05). Peter K. [2007-02-07 12:19, Ondrejov]

· The wind died down, so I'm doing this one tonight.
Don [2007-01-21 04:21, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting this tonight.
Don [2007-01-18 03:50, CarbuncleHill]

(1610) Mirnaya (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot on 5 nights: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01610.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Vladimir, despite your unstable winter weather.

Petr [2021-02-04 13:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on several nights.
Vladimir [2021-02-03 08:01, Sopot AO]

(1526) Mikkeli (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4927, copied below for your convenience.

Cheers, Petr

(1526) MIKKELI
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; M. Husarik and T. Michalak, Skalnate Pleso Observatory; D. Pray,
Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; R. Goncalves,
Linhaceira, Tomar, Portugal; J. Oey, Blue Mountains Observatory, Leura, NSW,
Australia; and P. Bacci and M. Maestripieri, Astronomical Observatory, San
Marcello Pistoiese, Italy, report that photometric observations taken with a
0.35-m telescope at the Sopot Observatory in Serbia, 0.61-m and 1.3-m
telescopes at the Skalnate Pleso Observatory, a 0.50-m telescope at the
Sugarloaf Mountain Observatory, a 0.35-m telescope at the Linhaceira
Observatory, a 0.35-m telescope at the Blue Mountains Observatory, and a
0.60-m telescope at the San Marcello Pistoiese Observatory during 2020 Oct.
9-23 reveal that minor planet (1526) is a binary system with an orbital
period of 15.98 Â± 0.01 hr. The primary shows a period of 2.9341 Â±
0.0001 hr and has a light-curve amplitude of 0.23 mag at solar phases 4-9
degrees. Mutual eclipse/occultation events that are 0.04 to 0.07 magnitude
deep indicate a secondary-to-primary mean-diameter ratio of 0.20 Â± 0.02.

2021 January 28 (CBET 4927) Daniel W. E. Green [2021-01-29 07:46, Ondrejov]

· Started a run on this at 17:50 Dec 14, UT. 104 San Marcello [2020-12-14 19:57, Paolo Bacci] Message sent to observers

· (1526) Mikkeli:

"Started a run on this at 17:20 Dec 13, UT. 104 san marcello"

[2020-12-13 18:01, Paolo Bacci]

· Just started a run on this one for the next five hours.

Russ [2020-12-09 01:31, Shed of Science] Message sent to observers

· Started a run on this at 22:50 Dec 6, UT. The run will at 04:00. [2020-12-06 23:07, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start on this one tonight again starting now for about 5 hours.
Russ [2020-12-05 00:57, Shed of Science] Message sent to observers

· Started a run on this target tonight. Will run for several hours.

Russ [2020-12-03 03:16, Shed of Science]

· Did a run on the on Nov 8 and will do it again tonight, Nov 9 UT. [2020-11-08 23:18, Sugarloaf] Message sent to observers

· Recent data show unexplained deviations from the previously estimated P_orb again:
http://www.asu.cas.cz/~asteroid/01526_2020b_porb.png
http://www.asu.cas.cz/~asteroid/01526_2020b_p1.png

More good-quality data (at any time/phase) are needed so that we hopefully get an understanding on what it is in this one.

Clear Skies, Petr [2020-10-26 10:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hope to make data for 0.752 event.
Marek [2020-10-23 18:44, SkalnatePleso] [Remove]
Message sent to observers

· Going to catch the 0.256 event.
Marek [2020-10-20 19:51, SkalnatePleso] [Remove]

· Starting this at 00:00, Oct 18 UT. [2020-10-17 22:58, Sugarloaf] Message sent to observers

· Recent high-quality data established the orbit period reasonably:
http://www.asu.cas.cz/~asteroid/01526_2020b_porb.png
http://www.asu.cas.cz/~asteroid/01526_2020b_p1.png

More data (errors < 0.01 mag; don't bother in less ideal conditions) are needed to refine the orbit period. We will also see whether we can resolve the issue of the unfitting September data then. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020-10-15 13.09 0.256
2020-10-16 5.05 0.256
2020-10-16 21.01 0.256
2020-10-17 12.97 0.256
2020-10-18 4.93 0.256
2020-10-18 20.89 0.256
2020-10-19 12.85 0.256
2020-10-20 4.81 0.256
2020-10-20 20.77 0.256
2020-10-21 12.73 0.256
2020-10-22 4.69 0.256
2020-10-22 20.65 0.256
2020-10-23 12.61 0.256
2020-10-24 4.57 0.256
2020-10-24 20.53 0.256
2020-10-25 12.49 0.256
2020-10-26 4.45 0.256
2020-10-26 20.41 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2020-10-15 21.00 0.752
2020-10-16 12.96 0.752
2020-10-17 4.92 0.752
2020-10-17 20.88 0.752
2020-10-18 12.84 0.752
2020-10-19 4.80 0.752
2020-10-19 20.76 0.752
2020-10-20 12.72 0.752
2020-10-21 4.68 0.752
2020-10-21 20.64 0.752
2020-10-22 12.60 0.752
2020-10-23 4.56 0.752
2020-10-23 20.52 0.752
2020-10-24 12.48 0.752
2020-10-25 4.44 0.752
2020-10-25 20.40 0.752
2020-10-26 12.36 0.752

Clear Skies, Petr [2020-10-15 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· More new data by Don Pray and by Rui Goncalves joined in. They both catched events. A tentative solution:
http://www.asu.cas.cz/~asteroid/01526_2020b_porb.png
http://www.asu.cas.cz/~asteroid/01526_2020b_p1.png

Though this current solution seems good formally, a problem is that the data we took in September don't fit with the suggested 15.97-h orbit period. More high-quality data (errors 0.01 mag) at any time/orbit phase are needed; hopefully we will resolve the issue with the September data then.

Clear Skies, Petr [2020-10-13 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has resumed observations of this binary candidate from Sopot after the full moon, catched a nice event right away:
http://www.asu.cas.cz/~asteroid/01526_2020b_porb.png
http://www.asu.cas.cz/~asteroid/01526_2020b_p1.png

I encourage others here to help out with establishing orbit period of this binary. High-quality data (errors 0.01 mag) are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2020-10-12 14:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on 24/25 Sept from 17:50 to 01:20 U.T.
Vasilij Ch. [2020-09-25 01:25, Kharkiv] Message sent to observers

· Starting this one at 02:05 UT.
Don [2020-09-23 00:54, Sugarloaf]

· Starting this at 02:10 UT.
Don [2020-09-22 00:55, Sugarloaf]

· Extensive data taken for this binary candidate over the past week, a few attenuations catched, but no good solution for their period yet. In the second plot below, the data are folded with a period of 24 h just to show them:
http://www.asu.cas.cz/~asteroid/01526_2020a_p1.png
http://www.asu.cas.cz/~asteroid/01526_2020a_porb.png

More high-quality data are needed to hopefully get solution. Observe it only if and when you can get errors < 0.015 mag; lower quality data are not very likely to bring solution.

Clear Skies, Petr [2020-09-21 10:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on Sep 19 and plan to again on Sep 20 UT.
Don [2020-09-19 18:45, Sugarloaf] Message sent to observers

· Plan to start this one at 02:40 UT.
Don [2020-09-17 00:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this starting at 02:50, Sep 16 UT.
Don [2020-09-16 22:32, Sugarloaf]

· I started this one from 18:30 U.T. Vasilij Ch. [2020-09-16 21:00, Kharkiv] Message sent to observers

· Vladimir Benishek has observed this off-list target from Sopot on three nights, found it to be another binary suspect. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/01526_2020a_p1.png
http://www.asu.cas.cz/~asteroid/01526_2020a_porb.png
(The P_orb value above was set just for plotting purpose. There is no real solution for the orbit period yet, of course.)

I think that Vladimir will appreciate a help with this one as well. Errors of 0.01 mag are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2020-09-16 13:22, Ondrejov] Message sent to BinAstPhotSurvey conference

(10617) Takumi (Finished) - binary candidate, more data needed [Add new note]
· Insufficient data for solving this binary suspect. Target closed for this apparition. Petr [2021-01-27 12:18, Ondrejov]

· Starting a run on this one tonight.

Russ [2021-01-07 02:11, Shed of Science] Message sent to observers

· Starting a run on this one tonight.

Russ [2021-01-07 02:11, Shed of Science]

· Russ Durkee catched an attenuation in this one before the end of his run on Dec. 20. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/10617_2020a_porb.png
http://www.asu.cas.cz/~asteroid/10617_2020a_p1.png
(The P_orb value in the first plot above was set just for plotting purpose. There is no real solution for the orbit period yet, of course.)

More data (with errors not greater than 0.015 mag) are needed.

Clear Skies, Petr [2020-12-21 15:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one again tonight.

Russ [2020-12-21 01:49, Shed of Science] Message sent to observers

· Just started this one...

Russ [2020-12-20 01:31, Shed of Science]

· Start 21:55 San Marcello (104) [2020-12-18 21:51, Paolo Bacci]

· Observing this one tonight.
Vladimir [2020-12-16 21:58, Sopot AO] Message sent to observers

· Working on this one tonight.

Russ [2020-12-15 02:07, Shed of Science]

· Vladimir Benishek observed this off-list target from Sopot on 2 nights. Either it is a short-period bimodal lc with additional component present, or it is a longer-period lc with mutliple maxima and minima; a formal composite lc for the former case:
http://www.asu.cas.cz/~asteroid/10617.png

More data is needed to resolve. Vladimir would appreciate a help by others here.

Clear Skies, Petr [2020-12-07 13:27, Ondrejov] Message sent to BinAstPhotSurvey conference

(3188) Jekabsons (Finished) - binary suspect, more data needed [Add new note]
· No solutions for the apparent attenuations obtained. Closing the target for this apparition. Petr [2021-01-27 12:16, Ondrejov]

· observed in November on the following dates 11/09,11/13,11/14,11/20,11/22,11/23 [2021-01-01 21:45, Blue Mountains Obs] Message sent to observers

· Started on this one again tonight.

Russ [2020-12-16 02:53, Shed of Science]

· Started this one tonight.

Russ [2020-12-13 02:41, Shed of Science]

· Began a run on this one tonight.

Russ [2020-12-12 01:58, Shed of Science] Message sent to observers

· Started on this one tonight. Should go for about 6 hours.

Russ [2020-12-10 01:52, Shed of Science]

· Began third night run on this one from DSO at 2320 UT. Hope to get 8 hours. Got 8 hours first two nights. Joe [2020-11-20 23:21, Dark Sky & PROMPT] Message sent to observers

· Began run on this one from DSO at 2320 UT. Hope to get 8 hours. Got 8 hours last night. Joe [2020-11-19 23:39, Dark Sky & PROMPT]

· Began run on this one from DSO at 2340 UT. Hope to get 8 hours. Joe [2020-11-19 00:01, Dark Sky & PROMPT] Message sent to observers

· Vladimir Benishek took another data for this binary candidate. A tentative lc decomposition (not unique for any of the two periods):
http://www.asu.cas.cz/~asteroid/03188_2020a_p1.png
http://www.asu.cas.cz/~asteroid/03188_2020a_porb.png

More data (errors < 0.02 mag) are needed.

Clear Skies, Petr [2020-11-16 12:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/03188_2020a_p1.png
http://www.asu.cas.cz/~asteroid/03188_2020a_porb.png
(The P_orb in the second plot above was set just for plotting purpose. No orbit period has been established yet, of course.)

Vladimir would appreciate a help by others here. Data with errors < 0.02 mag are needed; don't bother in sub-optimal conditions.

Clear Skies, Petr [2020-11-09 10:16, Ondrejov] Message sent to BinAstPhotSurvey conference

(2984) Chaucer (Finished) [Add new note]
· Patrick Sogorb observed this new target from Bastidan Observatory on 5 nights: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/02984.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Patrick.

Petr [2021-01-26 10:35, Ondrejov] Message sent to BinAstPhotSurvey conference

(1492)Oppolzer (Finished) - prime suspect [Add new note]
· Russ Durkee observed this return "prime suspect" from Shed of Science South on 3 nights: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/01492_c1.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-01-26 10:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will start this one again tonight.

Russ [2021-01-13 03:04, Shed of Science] Message sent to observers

· Started new target tonight.

Russ [2021-01-08 04:21, Shed of Science] Message sent to BinAstPhotSurvey conference

(18287) Verkin (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/18287.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-01-11 09:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target on Dec 23 and will run it tonight, Jan 8 UT.
Don [2021-01-08 00:05, Sugarloaf]

(4788) Simpson (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4902, copied below for your convenience.

Cheers, Petr

(4788) SIMPSON
P. Sogorb, La Bastide des Jourdans, France; P. Pravec, Ondrejov
Observatory; M. Husarik, G. Cervak, and M. Pikler, Skalnate Pleso Observatory;
R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; V.
Benishek, Belgrade Astronomical Observatory; J. M. Bosch, Santa Maria de
Montmagastrell, Tarrega, Spain; R. Behrend, Geneva Observatory; and V.
Chiorny, Kharkiv Observatory, report that photometric observations taken with
a 0.28-m telescope at the Bastidan Observatory in France, a 0.61-m telescope
at the Skalnate Pleso Observatory, a 0.50-m telescope at the Shed of Science
South Observatory, a 0.35-m telescope at the Sopot Observatory in Serbia, a
0.41-m telescope at the Santa Maria de Montmagastrell Observatory, and a
0.70-m telescope at the Chuguev station of the Kharkiv Observatory in Ukraine
during 2020 Sept. 27-Nov. 15 reveal that minor planet (4788) is a binary
system with an orbital period of 14.98 Â± 0.01 hr. The primary shows a
period of 2.81752 Â± 0.00008 hr and has a light-curve amplitude of 0.18 mag
at solar phases 4-12 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.03 to 0.07 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.17. There
is also a second rotational lightcurve component with a period of 3.1506 Â±
0.0002 hr and an amplitude of 0.03 mag in the combined primary-plus-secondary
lightcurve, which may belong to the eclipsing/occulting secondary or to a
third body of the system.

2021 January 7 (CBET 4902) Daniel W. E. Green [2021-01-07 15:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Submitting our report on this one to CBET. Plots of the lc decompositions of our data:
http://www.asu.cas.cz/~asteroid/04788_2020a_porb.png
http://www.asu.cas.cz/~asteroid/04788_2020a_p1.png
http://www.asu.cas.cz/~asteroid/04788_2020a_p2.png
http://www.asu.cas.cz/~asteroid/04788_2020a_p2_nsp.png
http://www.asu.cas.cz/~asteroid/04788_2020b_porb.png
http://www.asu.cas.cz/~asteroid/04788_2020b_p1.png
http://www.asu.cas.cz/~asteroid/04788_2020b_p2.png
http://www.asu.cas.cz/~asteroid/04788_2020b_p2_nsp.png
http://www.asu.cas.cz/~asteroid/04788_2020c_porb.png
http://www.asu.cas.cz/~asteroid/04788_2020c_p1.png
http://www.asu.cas.cz/~asteroid/04788_2020c_p2.png
The second rotational period is significant (though we cannot resolve whether it belongs to the observed eclipsing/occulting secondary or to a third body in the system --- though the latter is more plausible).

Cheers, Petr [2021-01-04 14:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our data for this new binary obtained so far:
http://www.asu.cas.cz/~asteroid/04788_2020a_porb.png
http://www.asu.cas.cz/~asteroid/04788_2020a_p1.png
http://www.asu.cas.cz/~asteroid/04788_2020a_p2.png
http://www.asu.cas.cz/~asteroid/04788_2020b_porb.png
http://www.asu.cas.cz/~asteroid/04788_2020b_p1.png
http://www.asu.cas.cz/~asteroid/04788_2020b_p2.png
http://www.asu.cas.cz/~asteroid/04788_2020c_porb.png
http://www.asu.cas.cz/~asteroid/04788_2020c_p1.png
http://www.asu.cas.cz/~asteroid/04788_2020c_p2.png

It appears that the system has moved out of the event geometry recently. It would be good to confirm it with final high-quality observations (errors < 0.015 mag, any orbit phase) in the next month. Then we will publish it on CBET.

Clear Skies, Petr [2020-11-23 08:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· I am doing another run on this tonight under good conditions.
Russ [2020-11-15 04:21, Shed of Science] Message sent to observers

· I will do another run on this one tonight.

Russ [2020-11-09 01:14, Shed of Science]

· This one is positioned well for me tonight. I will cover for the next 6 hours.
Russ [2020-11-07 02:28, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/04788_2020a_p1.png
http://www.asu.cas.cz/~asteroid/04788_2020a_p2.png
http://www.asu.cas.cz/~asteroid/04788_2020a_porb.png
The second rotational lc component appears significant despite its low amplitude. (It may belong to the secondary we observe, or to a third body in the asteroid system.) The orbit period is likely but it needs to be nailed down. More high-quality data (errors not greater than 0.015 mag) are needed. Below is an event ephemeris for the likely orbit period, but don't limit your observations too narrowly around the predicted times.

Date/Time UTC (LTc.) Phase
--------------------------
2020-11- 3 13.75 0.258
2020-11- 4 4.73 0.258
2020-11- 4 19.71 0.258
2020-11- 5 10.69 0.258
2020-11- 6 1.67 0.258
2020-11- 6 16.65 0.258
2020-11- 7 7.63 0.258
2020-11- 7 22.61 0.258
2020-11- 8 13.59 0.258
2020-11- 9 4.57 0.258
2020-11- 9 19.55 0.258
2020-11-10 10.53 0.258
2020-11-11 1.51 0.258
2020-11-11 16.49 0.258
2020-11-12 7.47 0.258
2020-11-12 22.45 0.258
2020-11-13 13.43 0.258
2020-11-14 4.41 0.258
2020-11-14 19.39 0.258
2020-11-15 10.37 0.258
2020-11-16 1.35 0.258
2020-11-16 16.33 0.258
2020-11-17 7.31 0.258
2020-11-17 22.29 0.258
2020-11-18 13.27 0.258
2020-11-19 4.25 0.258
2020-11-19 19.23 0.258
2020-11-20 10.21 0.258
2020-11-21 1.19 0.258
2020-11-21 16.17 0.258
2020-11-22 7.15 0.258
2020-11-22 22.13 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2020-11- 3 21.11 0.750
2020-11- 4 12.09 0.750
2020-11- 5 3.07 0.750
2020-11- 5 18.05 0.750
2020-11- 6 9.03 0.750
2020-11- 7 0.01 0.750
2020-11- 7 14.99 0.750
2020-11- 8 5.97 0.750
2020-11- 8 20.95 0.750
2020-11- 9 11.93 0.750
2020-11-10 2.91 0.750
2020-11-10 17.89 0.750
2020-11-11 8.87 0.750
2020-11-11 23.85 0.750
2020-11-12 14.83 0.750
2020-11-13 5.81 0.750
2020-11-13 20.79 0.750
2020-11-14 11.77 0.750
2020-11-15 2.75 0.750
2020-11-15 17.73 0.750
2020-11-16 8.71 0.750
2020-11-16 23.69 0.750
2020-11-17 14.67 0.750
2020-11-18 5.65 0.750
2020-11-18 20.63 0.750
2020-11-19 11.61 0.750
2020-11-20 2.59 0.750
2020-11-20 17.57 0.750
2020-11-21 8.55 0.750
2020-11-21 23.53 0.750
2020-11-22 14.51 0.750

Clear Skies, Petr [2020-10-27 07:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Mikkeli and Zichichi are now out for me that time, so I go to start this one.
Marek [2020-10-21 23:00, SkalnatePleso] [Remove]
Message sent to observers

· I observed this one tonight on 20/21 Oct from 18:30 to 01:30 U.T. Vasilij Ch. [2020-10-21 02:21, Kharkiv]

· Vladimir Benishek observed this one from Sopot on the past night, catched an event. A tentative solution (may be wrong):
http://www.asu.cas.cz/~asteroid/04788_2020a_porb.png
http://www.asu.cas.cz/~asteroid/04788_2020a_p1.png

More observations are needed to establish its orbit period. Data with errors < 0.02 mag are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2020-10-14 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Patrick Sogorb has observed this off-list target on 3 nights, saw two shallow attenuations. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/04788_2020a_p1.png
http://www.asu.cas.cz/~asteroid/04788_2020a_porb.png
(The period in the second plot above was set just for plotting purpose, there is obviously no solution for P_orb yet.)

A confirmation with more observations is needed. Patrick would appreciate a help by others here. Data with errors < 0.02 mag are needed; don't bother in sub-optimal conditions.

Clear Skies, Petr [2020-10-12 09:16, Ondrejov] Message sent to BinAstPhotSurvey conference

(33985) 2000 NG25 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 nights: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/33985.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2021-01-05 09:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:10 UT.
Don [2021-01-03 01:41, Sugarloaf]

· Planning to start this one at 01:00, Dec 19 UT.
Don [2020-12-18 22:30, Sugarloaf] Message sent to BinAstPhotSurvey conference

(16694) 1995 AJ (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4899, copied below for your convenience.

Happy New Year!

Petr

(16694) 1995 AJ
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
K. Hornoch, and P. Kusnirak, Ondrejov Observatory; R. Durkee, Shed of Science
South Observatory, Pontotoc, TX, U.S.A.; V. Chiorny, Kharkiv Observatory; and
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A., report
that photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.65-m telescope at Ondrejov Observatory, a 0.50-m
telescope at the Shed of Science South Observatory, a 0.70-m telescope at the
Chuguev station of the Kharkiv Observatory in Ukraine, and a 0.50-m telescope
at the Sugarloaf Mountain Observatory during Aug. 14-Nov. 19 reveal that minor
planet (16694) is a binary system with an orbital period of 25.28 Â± 0.02 hr.
The primary shows a period of 3.6421 Â± 0.0003 hr and has a light-curve
amplitude of 0.10 mag at solar phases 7-18 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.06 magnitude
deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.23. The mean absolute magnitude in the Cousins R photometric system is H_R
= 13.77 Â± 0.08, assuming the phase relation slope parameter G = 0.24 Â±
0.11.

2020 December 23 (CBET 4899) Daniel W. E. Green [2021-01-04 14:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this tonight, Nov 21 UT.
Don [2020-11-21 00:08, Sugarloaf] Message sent to observers

· Doing a run on this tonight, and should catch the 0.230 phase event.
Don [2020-11-18 23:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Further interesting evolution (not understood yet) of the mutual events in this one:
http://www.asu.cas.cz/~asteroid/16694_2020a_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020a_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020b_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020b_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020c_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020c_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020d_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020d_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020e_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020e_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020f_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020f_p1.png

More data (with errors not greater than 0.015 mag) are needed so that we hopefully get an understanding of the puzzling behaviour. Event ephemeris (but don't limit your observations too narrowly around the predicted event times):

Date/Time UTC (LTc.) Phase
--------------------------
2020-11- 4 6.29 0.230
2020-11- 5 7.58 0.230
2020-11- 6 8.87 0.230
2020-11- 7 10.15 0.230
2020-11- 8 11.44 0.230
2020-11- 9 12.73 0.230
2020-11-10 14.02 0.230
2020-11-11 15.30 0.230
2020-11-12 16.59 0.230
2020-11-13 17.88 0.230
2020-11-14 19.16 0.230
2020-11-15 20.45 0.230
2020-11-16 21.74 0.230
2020-11-17 23.02 0.230
2020-11-19 0.31 0.230
2020-11-20 1.60 0.230
2020-11-21 2.89 0.230

Date/Time UTC (LTc.) Phase
--------------------------
2020-11- 3 18.16 0.750
2020-11- 4 19.44 0.750
2020-11- 5 20.73 0.750
2020-11- 6 22.02 0.750
2020-11- 7 23.30 0.750
2020-11- 9 0.59 0.750
2020-11-10 1.88 0.750
2020-11-11 3.16 0.750
2020-11-12 4.45 0.750
2020-11-13 5.74 0.750
2020-11-14 7.03 0.750
2020-11-15 8.31 0.750
2020-11-16 9.60 0.750
2020-11-17 10.89 0.750
2020-11-18 12.17 0.750
2020-11-19 13.46 0.750
2020-11-20 14.75 0.750
2020-11-21 16.03 0.750

Clear Skies, Petr [2020-10-27 13:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our recent data taken for this one show further interesting evolution of the mutual events. Our complete data:
http://www.asu.cas.cz/~asteroid/16694_2020a_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020a_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020b_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020b_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020c_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020c_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020d_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020d_p1.png

More data (with errors < 0.015 mag) are needed to hopefully get an understanding of the behaviour. Updated event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 9 23.43 0.220
2020-10-11 0.72 0.220
2020-10-12 2.02 0.220
2020-10-13 3.31 0.220
2020-10-14 4.60 0.220
2020-10-15 5.90 0.220
2020-10-16 7.19 0.220
2020-10-17 8.48 0.220
2020-10-18 9.77 0.220
2020-10-19 11.07 0.220
2020-10-20 12.36 0.220
2020-10-21 13.65 0.220
2020-10-22 14.95 0.220
2020-10-23 16.24 0.220
2020-10-24 17.53 0.220

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 9 11.04 0.730
2020-10-10 12.34 0.730
2020-10-11 13.63 0.730
2020-10-12 14.92 0.730
2020-10-13 16.22 0.730
2020-10-14 17.51 0.730
2020-10-15 18.80 0.730
2020-10-16 20.09 0.730
2020-10-17 21.39 0.730
2020-10-18 22.68 0.730
2020-10-19 23.97 0.730
2020-10-21 1.27 0.730
2020-10-22 2.56 0.730
2020-10-23 3.85 0.730
2020-10-24 5.15 0.730

Clear Skies, Petr [2020-10-09 08:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Further interesting event evolution in this one. Our data so far:
http://www.asu.cas.cz/~asteroid/16694_2020a_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020a_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020b_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020b_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020c_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020c_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020d_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020d_p1.png

More data are needed to see how the events evolve. Errors of 0.01 mag are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 19.12 0.230
2020-10- 6 20.43 0.230
2020-10- 7 21.74 0.230
2020-10- 8 23.05 0.230
2020-10-10 0.36 0.230
2020-10-11 1.66 0.230
2020-10-12 2.97 0.230
2020-10-13 4.28 0.230
2020-10-14 5.59 0.230
2020-10-15 6.90 0.230
2020-10-16 8.20 0.230
2020-10-17 9.51 0.230
2020-10-18 10.82 0.230
2020-10-19 12.13 0.230
2020-10-20 13.44 0.230
2020-10-21 14.74 0.230
2020-10-22 16.05 0.230
2020-10-23 17.36 0.230
2020-10-24 18.67 0.230

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 6.28 0.722
2020-10- 6 7.59 0.722
2020-10- 7 8.90 0.722
2020-10- 8 10.21 0.722
2020-10- 9 11.52 0.722
2020-10-10 12.82 0.722
2020-10-11 14.13 0.722
2020-10-12 15.44 0.722
2020-10-13 16.75 0.722
2020-10-14 18.06 0.722
2020-10-15 19.36 0.722
2020-10-16 20.67 0.722
2020-10-17 21.98 0.722
2020-10-18 23.29 0.722
2020-10-20 0.60 0.722
2020-10-21 1.90 0.722
2020-10-22 3.21 0.722
2020-10-23 4.52 0.722
2020-10-24 5.83 0.722

Clear Skies, Petr [2020-09-29 08:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on 25/26 Sept of event 0,748 phase in good
conditions from 17:40 to 22:30 U.T.
Vasilij Ch. [2020-09-25 22:32, Kharkiv] Message sent to observers

· starting in good conditions.

russ [2020-09-24 02:52, Shed of Science]

· This one is very close to be ready for CBET too. Just one or two more high-quality sessions (errors 0.01 mag) should do it. The events evolve and further data for that will be good.
http://www.asu.cas.cz/~asteroid/16694_2020a_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020a_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020b_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020b_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020c_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020c_p1.png

Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-23 3.59 0.245
2020- 9-24 4.89 0.245
2020- 9-25 6.19 0.245
2020- 9-26 7.49 0.245
2020- 9-27 8.79 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-22 15.00 0.748
2020- 9-23 16.30 0.748
2020- 9-24 17.60 0.748
2020- 9-25 18.90 0.748
2020- 9-26 20.20 0.748
2020- 9-27 21.50 0.748

Clear Skies, Petr [2020-09-22 12:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on 15 Sept from 18:00 to 21:45 U.T. Vasilij Ch. [2020-09-16 00:57, Kharkiv] Message sent to observers

· Additional data taken by Russ Durkee from Shed of Science South for this one. A rather tentative solution (may be wrong):
http://www.asu.cas.cz/~asteroid/16694_2020a_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020a_p1.png
http://www.asu.cas.cz/~asteroid/16694_2020b_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020b_p1.png
Note that for this solution, the events have become shallower recently. In any case, it needs to be confirmed with high-quality data (errors 0.01 mag; don't bother in less ideal conditions). Event ephemeris for the tentative solution (but don't limit your observations just to the predicted times):

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9- 6 8.00 0.251
2020- 9- 7 9.38 0.251
2020- 9- 8 10.76 0.251
2020- 9- 9 12.14 0.251
2020- 9-10 13.52 0.251
2020- 9-11 14.90 0.251
2020- 9-12 16.28 0.251
2020- 9-13 17.66 0.251
2020- 9-14 19.04 0.251
2020- 9-15 20.42 0.251
2020- 9-16 21.80 0.251
2020- 9-17 23.18 0.251
2020- 9-19 0.56 0.251
2020- 9-20 1.94 0.251
2020- 9-21 3.32 0.251
2020- 9-22 4.70 0.251
2020- 9-23 6.08 0.251
2020- 9-24 7.46 0.251
2020- 9-25 8.84 0.251
2020- 9-26 10.22 0.251
2020- 9-27 11.60 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9- 6 20.35 0.738
2020- 9- 7 21.73 0.738
2020- 9- 8 23.11 0.738
2020- 9-10 0.49 0.738
2020- 9-11 1.87 0.738
2020- 9-12 3.25 0.738
2020- 9-13 4.63 0.738
2020- 9-14 6.01 0.738
2020- 9-15 7.39 0.738
2020- 9-16 8.77 0.738
2020- 9-17 10.15 0.738
2020- 9-18 11.53 0.738
2020- 9-19 12.91 0.738
2020- 9-20 14.29 0.738
2020- 9-21 15.67 0.738
2020- 9-22 17.05 0.738
2020- 9-23 18.43 0.738
2020- 9-24 19.81 0.738
2020- 9-25 21.19 0.738
2020- 9-26 22.57 0.738
2020- 9-27 23.95 0.738

Clear Skies, Petr [2020-08-31 11:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary candidate. While the primary period appears unique, there is a number of possible solutions for the orbit period. Lc decomposition for one of them:
http://www.asu.cas.cz/~asteroid/16694_2020a_porb.png
http://www.asu.cas.cz/~asteroid/16694_2020a_p1.png

Vladimir would appreaciate a help by others here. High-quality data are needed; don't bother in sub-optimal conditions.

Clear Skies, Petr [2020-08-29 14:17, Ondrejov] Message sent to BinAstPhotSurvey conference

(12336) 1992 WO3 (Finished) - prime suspect [Add new note]
· Don Pray observed this return "prime suspect" from Sugarloaf Mountain on 3 nights: Good solution and coverage, no deviation seen.
http://www.asu.cas.cz/~asteroid/12336_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-12-17 12:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one tonight.
Don [2020-12-07 02:06, Sugarloaf]

· Observed this on Nov 24.
Don [2020-11-25 01:27, Sugarloaf]

· Three nights by Don from Carbuncle Hill and two nights by Walt et al. from SRO: Unique period, multiple coverage, no deviation seen:
http://www.asu.cas.cz/~asteroid/12336.png
It is finished for the BinAstPhotSurvey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys!

Cheers, Petr [2006-12-11 09:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing what should be the final night on this (for me, anyway).
Don [2006-12-11 00:20, CarbuncleHill]

· Imaged from SRO 12/10 4:30 - 9:00 UT. Submitted photometry to Petr.

-Walt [2006-12-10 19:45, Sonoita] Message sent to BinAstPhotSurvey conference

· Started at 01:45ut in good conditions.
Don [2006-12-09 03:19, CarbuncleHill]

· Don has checked his data from the suspect session Nov. 26.2 and found that a stray light problem (with his new system, which he fine tunes during these days) affected the measurements. He remeasured it with the problem eliminated and resulting data fit entirely with the one period. So, this one was a false alarm. The revised lightcurve:
http://www.asu.cas.cz/~asteroid/12336.png

Petr [2006-12-04 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two nights by Don from Carbuncle Hill and one night by Walt et al. from SRO have shown that this one is a binary candidate with an apparent attenuation about 0.10 mag deep seen on 2006 Nov. 26.2, see
http://www.asu.cas.cz/~asteroid/12336.png
http://www.asu.cas.cz/~asteroid/12336_061126_dpray.png
More data in good conditions are needed to nail down the short period component (preferred value 2.95 h now), confirm the event, and derive their period.

Cheers, Petr [2006-12-03 14:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this around 02:00 ut in good conditions. Clouds to the west may interfere.
Don [2006-11-26 03:14, CarbuncleHill]

· Starting this one tonight in good conditions.
Don [2006-11-25 04:00, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3951) Zichichi (Finished) - return binary [Add new note]
· Apparition finished. [2020-12-07 14:44, Ondrejov]

· Data taken for this return binary in its current apparition up to now:
http://www.asu.cas.cz/~asteroid/03951_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03951_2020a_p1.png

More high-quality data (errors <= 0.015 mag) would be useful for refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 6.65 0.252
2020-10- 6 10.24 0.252
2020-10- 7 13.82 0.252
2020-10- 8 17.40 0.252
2020-10- 9 20.99 0.252
2020-10-11 0.57 0.252
2020-10-12 4.16 0.252
2020-10-13 7.74 0.252
2020-10-14 11.32 0.252
2020-10-15 14.91 0.252
2020-10-16 18.49 0.252
2020-10-17 22.08 0.252
2020-10-19 1.66 0.252
2020-10-20 5.24 0.252
2020-10-21 8.83 0.252
2020-10-22 12.41 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 20.40 0.751
2020-10- 6 23.99 0.751
2020-10- 8 3.57 0.751
2020-10- 9 7.16 0.751
2020-10-10 10.74 0.751
2020-10-11 14.32 0.751
2020-10-12 17.91 0.751
2020-10-13 21.49 0.751
2020-10-15 1.08 0.751
2020-10-16 4.66 0.751
2020-10-17 8.24 0.751
2020-10-18 11.83 0.751
2020-10-19 15.41 0.751
2020-10-20 19.00 0.751
2020-10-21 22.58 0.751

Clear Skies, Petr [2020-09-29 13:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 00:40 UT.
Don [2020-09-15 01:20, Sugarloaf] Message sent to observers

· Data taken for this return binary by Don Pray from Sugarloaf Mountain in this apparition so far:
http://www.asu.cas.cz/~asteroid/03951_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03951_2020a_p1.png

More high-quality data (errors <= 0.015 mag) would be useful for refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9- 5 9.48 0.244
2020- 9- 6 13.07 0.244
2020- 9- 7 16.66 0.244
2020- 9- 8 20.25 0.244
2020- 9- 9 23.84 0.244
2020- 9-11 3.43 0.244
2020- 9-12 7.02 0.244
2020- 9-13 10.61 0.244
2020- 9-14 14.20 0.244
2020- 9-15 17.79 0.244
2020- 9-16 21.38 0.244
2020- 9-18 0.97 0.244
2020- 9-19 4.56 0.244
2020- 9-20 8.15 0.244
2020- 9-21 11.74 0.244
2020- 9-22 15.33 0.244
2020- 9-23 18.92 0.244
2020- 9-24 22.51 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9- 5 23.45 0.751
2020- 9- 7 3.04 0.751
2020- 9- 8 6.63 0.751
2020- 9- 9 10.22 0.751
2020- 9-10 13.81 0.751
2020- 9-11 17.40 0.751
2020- 9-12 20.99 0.751
2020- 9-14 0.58 0.751
2020- 9-15 4.17 0.751
2020- 9-16 7.76 0.751
2020- 9-17 11.35 0.751
2020- 9-18 14.94 0.751
2020- 9-19 18.53 0.751
2020- 9-20 22.12 0.751
2020- 9-22 1.71 0.751
2020- 9-23 5.30 0.751
2020- 9-24 8.89 0.751
2020- 9-25 12.48 0.751

Clear Skies, Petr [2020-09-02 06:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to observe this tonight to catch the 0.247 phase event.
Don [2020-08-23 01:05, Sugarloaf]

· Don Pray has observed this return binary from Sugarloaf Mountain in its current apparition:
http://www.asu.cas.cz/~asteroid/03951_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03951_2020a_p1.png

Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-17 10.68 0.247
2020- 8-18 14.27 0.247
2020- 8-19 17.86 0.247
2020- 8-20 21.45 0.247
2020- 8-22 1.04 0.247
2020- 8-23 4.63 0.247
2020- 8-24 8.22 0.247
2020- 8-25 11.81 0.247
2020- 8-26 15.40 0.247
2020- 8-27 18.99 0.247
2020- 8-28 22.58 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-18 0.52 0.749
2020- 8-19 4.11 0.749
2020- 8-20 7.70 0.749
2020- 8-21 11.29 0.749
2020- 8-22 14.88 0.749
2020- 8-23 18.47 0.749
2020- 8-24 22.06 0.749
2020- 8-26 1.65 0.749
2020- 8-27 5.24 0.749
2020- 8-28 8.83 0.749
2020- 8-29 12.42 0.749

Clear Skies, Petr [2020-08-17 07:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a session on this on July 21.
Don [2020-07-24 00:46, Sugarloaf]

· Got first run of apparition from Prompt on JD 57100. Joe [2015-03-27 02:24, Dark Sky & PROMPT] Message sent to observers

· Three new sessions covering both events were taken by Don Pray from Sugarloaf Mountain and by Julian Oey from Leura recently:
http://www.asu.cas.cz/~asteroid/03951_13d_p1.png
http://www.asu.cas.cz/~asteroid/03951_13d_porb.png
http://www.asu.cas.cz/~asteroid/03951_13c_p1.png
http://www.asu.cas.cz/~asteroid/03951_13c_porb.png
http://www.asu.cas.cz/~asteroid/03951_13b_p1.png
http://www.asu.cas.cz/~asteroid/03951_13b_porb.png
http://www.asu.cas.cz/~asteroid/03951_13a_p1.png
http://www.asu.cas.cz/~asteroid/03951_13a_porb.png

Monitoring events with errors not greater than 0.02 mag in this lunation, which will be the last one for this apparition, would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-11-21 6.33 0.247
2013-11-22 9.92 0.247
2013-11-23 13.51 0.247
2013-11-24 17.10 0.247
2013-11-25 20.69 0.247
2013-11-27 0.28 0.247
2013-11-28 3.87 0.247
2013-11-29 7.46 0.247
2013-11-30 11.05 0.247
2013-12- 1 14.64 0.247
2013-12- 2 18.23 0.247
2013-12- 3 21.82 0.247
2013-12- 5 1.41 0.247
2013-12- 6 5.00 0.247
2013-12- 7 8.59 0.247
2013-12- 8 12.18 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2013-11-21 19.93 0.740
2013-11-22 23.52 0.740
2013-11-24 3.11 0.740
2013-11-25 6.70 0.740
2013-11-26 10.29 0.740
2013-11-27 13.88 0.740
2013-11-28 17.47 0.740
2013-11-29 21.06 0.740
2013-12- 1 0.65 0.740
2013-12- 2 4.24 0.740
2013-12- 3 7.83 0.740
2013-12- 4 11.42 0.740
2013-12- 5 15.01 0.740
2013-12- 6 18.60 0.740
2013-12- 7 22.19 0.740

Clear Skies, Petr [2013-11-18 15:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 11/07 capturing 0.26 phase event. [2013-11-08 10:50, Blue Mountains Obs] Message sent to observers

· Started a run at 23:00, Nov 3 UT to catch most of the 0.260 phase event.
Don [2013-11-04 02:24, Sugarloaf]

· I started a run at 22:40, Oct 30 UT to catch most of the 0.759 phase event.
Don [2013-10-31 00:23, Sugarloaf] Message sent to BinAstPhotSurvey conference

· We want to catch 0.75 phase, but Moon affects starfield :(
Marek and Gabo [2013-10-22 20:33, SkalnatePleso] [Remove]
Message sent to observers

· Two new sessions, covering the 0.75-phase event, were taken by Julian Oey from Leura and by Peter Kusnirak from here recently:
http://www.asu.cas.cz/~asteroid/03951_13c_p1.png
http://www.asu.cas.cz/~asteroid/03951_13c_porb.png
http://www.asu.cas.cz/~asteroid/03951_13b_p1.png
http://www.asu.cas.cz/~asteroid/03951_13b_porb.png
http://www.asu.cas.cz/~asteroid/03951_13a_p1.png
http://www.asu.cas.cz/~asteroid/03951_13a_porb.png

Monitoring events with errors not greater than 0.02 mag would be still useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-22 8.88 0.260
2013-10-23 12.45 0.260
2013-10-24 16.02 0.260
2013-10-25 19.59 0.260
2013-10-26 23.16 0.260
2013-10-28 2.73 0.260
2013-10-29 6.30 0.260
2013-10-30 9.87 0.260
2013-10-31 13.44 0.260
2013-11- 1 17.01 0.260
2013-11- 2 20.58 0.260
2013-11- 4 0.15 0.260
2013-11- 5 3.72 0.260
2013-11- 6 7.29 0.260
2013-11- 7 10.86 0.260
2013-11- 8 14.43 0.260
2013-11- 9 18.00 0.260
2013-11-10 21.57 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-22 22.65 0.759
2013-10-24 2.22 0.759
2013-10-25 5.79 0.759
2013-10-26 9.36 0.759
2013-10-27 12.93 0.759
2013-10-28 16.50 0.759
2013-10-29 20.07 0.759
2013-10-30 23.64 0.759
2013-11- 1 3.21 0.759
2013-11- 2 6.78 0.759
2013-11- 3 10.35 0.759
2013-11- 4 13.92 0.759
2013-11- 5 17.49 0.759
2013-11- 6 21.06 0.759
2013-11- 8 0.63 0.759
2013-11- 9 4.20 0.759
2013-11-10 7.77 0.759

Clear Skies, Petr [2013-10-15 09:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for almost 3 hours last night and covered 0.75-phase event. Peter K. [2013-10-14 04:34, Ondrejov] Message sent to observers

· observed from 13.5 to 17h 10/11 UT. Good condition capturing the 0.75phase event,. [2013-10-12 04:34, Blue Mountains Obs]

· Joe Pollock took four nights for this return binary (2nd apparition), three with the Prompt 1 telescope in Chile and one with the new P4-SSO at Siding Sping in Australia. Supported with one short run by Audrey Thirouin from Sierra Nevada Observatory. One full and one partial event coverage:
http://www.asu.cas.cz/~asteroid/03951_13a_p1.png
http://www.asu.cas.cz/~asteroid/03951_13a_porb.png
http://www.asu.cas.cz/~asteroid/03951_13b_p1.png
http://www.asu.cas.cz/~asteroid/03951_13b_porb.png

One more coverage of the 0.25-phase event and two coverages of the 0.75-phase event would be good; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-10- 1 16.48 0.251
2013-10- 2 20.07 0.251
2013-10- 3 23.66 0.251
2013-10- 5 3.25 0.251
2013-10- 6 6.84 0.251
2013-10- 7 10.43 0.251
2013-10- 8 14.02 0.251
2013-10- 9 17.61 0.251
2013-10-10 21.20 0.251
2013-10-12 0.79 0.251
2013-10-13 4.38 0.251
2013-10-14 7.97 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2013-10- 2 6.29 0.752
2013-10- 3 9.88 0.752
2013-10- 4 13.47 0.752
2013-10- 5 17.06 0.752
2013-10- 6 20.65 0.752
2013-10- 8 0.24 0.752
2013-10- 9 3.83 0.752
2013-10-10 7.42 0.752
2013-10-11 11.01 0.752
2013-10-12 14.60 0.752
2013-10-13 18.19 0.752
2013-10-14 21.78 0.752

Clear Skies, Petr [2013-10-01 07:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began a run from Prompt at 0145 UT under good conditions. Joe [2013-09-28 01:54, Dark Sky & PROMPT] Message sent to observers

· Our announcement on this binary has appeared on CBET 2698. The Survey page updated accordingly.

Cheers, Petr

(3951) ZICHICHI
P. Antonini, Bedoin, France; R. Behrend, Geneva Observatory; F. Colas and
J. Lecacheux, Paris Observatory; R. Goncalves, Linhaceira, Portugal; D.
Starkey, Auburn, IN, U.S.A.; F. Manzini, Sozzago, Italy; V. Reddy, University
of North Dakota; H. and H. Hamanowa, Motomiya, Fukushima, Japan; and R. Naves,
Barcelona, Spain, report that photometric observations obtained during 2006
Nov. 29 to 2007 Feb. 11 revealed that minor planet (3951) had a rotation
lightcurve with a period of 3.3944 hr and amplitude of 0.32 mag, to which
there were superimposed attenuations with depths of about 0.1 mag resembling
mutual events in a binary system -- but a unique solution for their period was
not obtained, so the binary nature of the asteroid was not unambiguously
established.

M. Husarik, Z. Kanuchova, Z. Krisandova, and M. Pikler, Skalnate Pleso
Observatory; P. Pravec and P. Kusnirak, Ondrejov Observatory; J. Pollock,
Appalachian State University; R. Durkee, Shed of Science Observatory,
Minneapolis, MN, U.S.A.; J. Vilagi, S. Gajdos, A. Galad, and P. Veres, Modra
Observatory; and D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A.
LaCluyze, Physics and Astronomy Department, University of North Carolina at
Chapel Hill, report that photometric observations obtained during 2011 Jan. 26
to Apr. 3 confirmed that minor planet (3951) is a binary system and estimated
an orbital period of 27.59 ± 0.01 hr. The primary shows a period of 3.39423
± 0.00007 hr, and it has a lightcurve amplitude of 0.26 mag. Mutual
eclipse/occultation events that are 0.12- and 0.23-mag deep indicate a lower
limit on the secondary-to-primary mean-diameter ratio of 0.33.

F. Marchis, J. E. Enriquez, and M. Allain, Carl Sagan Center at the
SETI Institute; and J. P. Emery, University of Tennessee at Knoxville, report
on integrated spectroscopic observations of the binary system (3951) recorded
from 2011 Apr. 1.276 to 1.353 UT with Infrared Telescope Facility's SPEX
instrument. A solar analogue (SAO 97748) was observed before and after the
target to compute a final reflectance spectrum from 0.67 to 2.55 microns.
Following the Bus-DeMeo taxonomy, the near-infrared spectrum is typical of
S-type minor planets, characterized by moderate 1- and 2-micron absorption
band features.

2011 April 14 (CBET 2698) Daniel W. E. Green [2011-04-15 06:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:15 UT in good conditions. Michal [2011-04-03 19:07, SkalnatePleso] [Remove]
Message sent to observers

· Observing tonight, I hope the weather would last as long as possible. Peter [2011-04-02 19:51, Modra]

· Trying to monitor attenuation tonight. Adrian [2011-03-30 20:25, Modra] Message sent to BinAstPhotSurvey conference

· Observing from 21:00 UT in average conditions at the moment. Michal [2011-03-23 22:33, SkalnatePleso] [Remove]
Message sent to observers

· Only a small update for this one with one short session by Jozef and Stefan from Modra:
http://www.asu.cas.cz/~asteroid/03951_11_porb.png

We are waiting with annoucing this one on CBET for Raoul Behrend who is to put together an information on their 2007 observations which suggested the binary nature but didn't establish a unique orbit period.

Anyway, the binary is still observable and monitoring events evolution would be useful for future modeling; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3-22 18.84 0.260
2011- 3-23 22.39 0.260
2011- 3-25 1.94 0.260
2011- 3-26 5.49 0.260
2011- 3-27 9.04 0.260
2011- 3-28 12.59 0.260
2011- 3-29 16.14 0.260
2011- 3-30 19.69 0.260
2011- 3-31 23.24 0.260
2011- 4- 2 2.79 0.260
2011- 4- 3 6.34 0.260
2011- 4- 4 9.89 0.260
2011- 4- 5 13.44 0.260
2011- 4- 6 16.99 0.260
2011- 4- 7 20.54 0.260
2011- 4- 9 0.09 0.260
2011- 4-10 3.64 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3-23 8.34 0.750
2011- 3-24 11.89 0.750
2011- 3-25 15.44 0.750
2011- 3-26 18.99 0.750
2011- 3-27 22.54 0.750
2011- 3-29 2.09 0.750
2011- 3-30 5.64 0.750
2011- 3-31 9.19 0.750
2011- 4- 1 12.74 0.750
2011- 4- 2 16.29 0.750
2011- 4- 3 19.84 0.750
2011- 4- 4 23.39 0.750
2011- 4- 6 2.94 0.750
2011- 4- 7 6.49 0.750
2011- 4- 8 10.04 0.750
2011- 4- 9 13.59 0.750

Clear Skies, Petr [2011-03-18 14:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt at 0030 UT. Hope to cover 0.750 phase event centered at 0548 UT. Joe [2011-02-27 00:58, Dark Sky & PROMPT] Message sent to observers

· Observing this object from 18 UT.

Jozef/Stefan [2011-02-24 17:48, Modra]

· This object from 18:00 UT. Gabo [2011-02-23 17:47, SkalnatePleso] [Remove]
Message sent to observers

· Two sessions taken by Joe Pollock with Prompt, slightly affected by the moonlight, but showing the primary event well. The orbital period is uniquely established: 27.55 +/- 0.05 h.
http://www.asu.cas.cz/~asteroid/03951_11_porb.png
http://www.asu.cas.cz/~asteroid/03951_11_p1.png
One more good coverage for the secondary event (phase 0.75) would be good to show if the bottom of the event is flat (that would indicate a total event and would allow to estimate D_2/D_1, as opposite to a partial event giving only a lower limit on the size ratio). Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2-21 12.04 0.750
2011- 2-22 15.59 0.750
2011- 2-23 19.14 0.750
2011- 2-24 22.69 0.750
2011- 2-26 2.24 0.750
2011- 2-27 5.79 0.750
2011- 2-28 9.34 0.750
2011- 3- 1 12.89 0.750
2011- 3- 2 16.44 0.750
2011- 3- 3 19.99 0.750
2011- 3- 4 23.54 0.750
2011- 3- 6 3.09 0.750
2011- 3- 7 6.64 0.750
2011- 3- 8 10.19 0.750
2011- 3- 9 13.74 0.750
2011- 3-10 17.29 0.750
2011- 3-11 20.84 0.750
2011- 3-13 0.39 0.750

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2-22 2.09 0.260
2011- 2-23 5.64 0.260
2011- 2-24 9.19 0.260
2011- 2-25 12.74 0.260
2011- 2-26 16.29 0.260
2011- 2-27 19.84 0.260
2011- 2-28 23.39 0.260
2011- 3- 2 2.94 0.260
2011- 3- 3 6.49 0.260
2011- 3- 4 10.04 0.260
2011- 3- 5 13.59 0.260
2011- 3- 6 17.14 0.260
2011- 3- 7 20.69 0.260
2011- 3- 9 0.24 0.260
2011- 3-10 3.79 0.260
2011- 3-11 7.34 0.260
2011- 3-12 10.89 0.260
2011- 3-13 14.44 0.260

Clear Skies, Petr [2011-02-21 10:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began from Prompt at 0055 under good but fairly bright moon conditions. Hopefully can get about 7 hours. Joe [2011-02-14 01:18, Dark Sky & PROMPT] Message sent to observers

· Russ Durkee took one long and one short session for this binary candidate, detected one attenuation. The data are consistent with the suggested 27.6-h period, but it needs to be confirmed with more observations; some other periods, e.g. 55.2 h, fit as well. See
http://www.asu.cas.cz/~asteroid/03951_11_porb.png
http://www.asu.cas.cz/~asteroid/03951_11_p1.png

Clear Skies, Petr [2011-02-13 16:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will be able to start a run on 3951 Zichichi starting at about 2:15UT. I should be able to follow it for 8 hours or so.

Russ [2011-02-11 01:22, Shed of Science] Message sent to observers

· This one was observed by Oleg Gerashchenko from Andrushivka Astronomical Observatory on three nights 2006 Oct. 27-29. His data gave P = 3.39 h and A = 0.25, i.e., the asteroid was shown to be a "prime suspect", but no significant deviations from the single periodicity was seen and we closed the target at that time,
http://www.asu.cas.cz/~asteroid/3951.png

Later during the apparition, observers from the group led by Raoul Behrend observed the asteroid and found suspect attenuation. I adviced them to take more data to confirm it, and they went and took extensive observations. They detected more suspect attenuations, and I tried to solve for their period, finally found a possible solution that explained all but two of the apparent attenuations there. The two unfit sessions were both by Francois Colas (also a member of this BinAstPhotSurvey group here) and I suspected that they might be observational artifacts. In my last mail on this object then I wrote all it to Raoul, see a copy of the email below, but received no answer. As it was not a satisfactory solution -having two unfit sessions by an observer producing mostly reliable data is not satisfactory- I went on and forgot about the case.

In the past month the asteroid came to favorable conditions again and I added it to the regular monthly target list update as being a "prime suspect" through my normal routine that uses data from the BinAstPhotSurvey and the LCDB, but not "personal communications" from Behrend, not realizing that this "prime suspect" was actually a binary suspect by Behrend et al. from 2007. Marek Husarik et al. picked it up and took several nights for it from Skalnate Pleso. Their last night's data show what appears to be an event:
http://www.asu.cas.cz/~asteroid/03951_11_porb.png
In this plot, the data have been folded with a tentative period of 27.6 h, close to the unconfirmed estimate from my analysis of the Behrend et al.'s data of 2006-7. Obviously, more data are needed to establish it well. I hesitate to provide an ephemeris for the events based on this tentative period to don't lead you in a wrong direction; if you are interested to help out to confirm this suspect binary with determining a unique solution for the orbit period, your long sessions taken at any time should be useful.

Clear Skies, Petr

Written to Raoul Behrend on 2007 Feb. 26:

Hi Raoul,

At last, there is a light at the end of the tunnel :-)

For this, I have used data with errors <0.05 mag now. Some data of lower quality (e.g., four of the five nights by Hamanowa) were checked for consistency and found consitent even with their higher noise. Most of the data can be explained as a linear addition of two components: the well know 3.3944 h and another one with two attenuations per period of 27.635 h, see
http://www.asu.cas.cz/~asteroid/3951_061210_070211_shortpc.png
http://www.asu.cas.cz/~asteroid/3951_061210_070211_longpc.png
Well, two sessions don't fit with the model: They are the sessions of Jan. 5.9 and Feb. 3.9 by Francois which both showed a lower beginning. The session of Feb. 3.9 was rather noisy -it was the last session taken by Francois, so I assume that conditions deteriorated- so the deviation there perhaps might be an effect of poor conditions (can Francois confirm?) The other deviating session of Jan. 5.9 would be really good to check for Francois; I just guess that there might be something with conditions at the beginning of the night too, since the first 30 points show a higher scatter than the rest (~120) points of the night. A check is needed so that we know if there indeed was some problem with conditions as I suspect .... If there was no problem with conditions and the feature is real, then I am lost.

Cheers,
Petr [2011-02-10 15:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· We observed this one in 6 nights from Jan 26 to Feb 2. Period and amplitude are very similar to the values in the 2006 apparition. http://www.asu.cas.cz/~asteroid/3951.png
Data sent to Peter K.

Michal, Zuzana, and Marek [2011-02-03 10:16, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Three nights by Oleg Gerashchenko from Andrushivka Astronomical Observatory for this one: a unique period, good coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/3951.png
It has been done satisfactorily for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work, Oleg! Welcome to the BinAstPhotSurvey.

Cheers, Petr [2006-10-30 13:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Object observed from 21:38-02:16UT. First result: P~3.5h, amplitude ~0.25. (Sorry, error in email-adres) [2006-10-27 14:40, Andrushivka]

· Object observed from 21:38-02:16UT. First result: P~3.5h, amplitude ~0.25. [2006-10-27 14:33, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(1626) Sadeya (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4893, copied below for your convenience.

Cheers, Petr

(1626) SADEYA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; A. Marchini, R. Papini, and F. Salvaggio, Dipartimento di Scienze
Fisiche, Della Terra e Dell'Ambiente, University of Siena; V. Chiorny, Kharkiv
Observatory; and M. Husarik, Skalnate Pleso Observatory, report that
photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.30-m telescope at the Astronomical Observatory of
the University of Siena, a 0.70-m telescope at the Chuguev station of the
Kharkiv Observatory in Ukraine, and a 0.61-m telescope at the Skalnate Pleso
Observatory during Aug. 1-Nov. 1 reveal that minor planet (1626) is a binary
system with an orbital period of 51.3 Â± 0.2 hr. The primary shows a
period of 3.4202 Â± 0.0002 hr and has a light-curve amplitude of 0.16 mag at
solar phase 19 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that were 0.07 to 0.10 magnitude deep during Aug.
1-6 indicated a secondary-to-primary mean-diameter ratio of 0.26 Â± 0.02;
the events became partial and more shallow, with depth 0.04-0.05 magnitude
during Aug. 16-22, and they disappeared by Sept. 3, indicating that the
binary system moved out of eclipse/occultation geometry with respect to the
sun and the earth.

2020 December 1 (CBET 4893) Daniel W. E. Green [2020-12-01 14:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for CBET. We were interested in what more we might see in the object after the events disappeared in late August-early September, but nothing substantial happened since then. Our complete data:
http://www.asu.cas.cz/~asteroid/01626_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020a_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020b_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020b_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020c_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020c_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020d_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020d_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020e_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020e_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020f_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020f_p1.png

Cheers, Petr [2020-11-30 11:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on 09/12 to capturing the 0.756 phase [2020-09-17 20:40, Blue Mountains Obs] Message sent to observers

· Current (slightly updated) solution for this one:
http://www.asu.cas.cz/~asteroid/01626_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020a_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020b_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020b_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020c_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020c_p1.png

We need to take more data to see whether there are still partial events, or if the system has already moved out of the event geometry entirely. High-quality data (errors 0.01 mag) taken around (but not only) the times below are needed.

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-31 19.57 0.290
2020- 9- 2 22.87 0.290
2020- 9- 5 2.17 0.290
2020- 9- 7 5.47 0.290
2020- 9- 9 8.77 0.290
2020- 9-11 12.07 0.290
2020- 9-13 15.37 0.290
2020- 9-15 18.67 0.290
2020- 9-17 21.97 0.290
2020- 9-20 1.27 0.290
2020- 9-22 4.57 0.290
2020- 9-24 7.87 0.290
2020- 9-26 11.17 0.290
2020- 9-28 14.47 0.290
2020- 9-30 17.77 0.290

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9- 1 19.44 0.756
2020- 9- 3 22.74 0.756
2020- 9- 6 2.04 0.756
2020- 9- 8 5.34 0.756
2020- 9-10 8.64 0.756
2020- 9-12 11.94 0.756
2020- 9-14 15.24 0.756
2020- 9-16 18.54 0.756
2020- 9-18 21.84 0.756
2020- 9-21 1.14 0.756
2020- 9-23 4.44 0.756
2020- 9-25 7.74 0.756
2020- 9-27 11.04 0.756
2020- 9-29 14.34 0.756

Clear Skies, Petr [2020-08-31 07:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· More extensive data taken for this one. It appears that the system is moving away from event geometry. (A less likely possibility is that it is a more complex system; I'll check uniqueness of the solution later on.) See following plots:
http://www.asu.cas.cz/~asteroid/01626_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020a_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020b_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020b_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020c_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020c_p1.png

More high-quality data (errors 0.01 mag; don't bother in less ideal conditions) are needed. Covering any orbital phases will be useful, but particularly good would be to cover following times:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-26 9.28 0.773
2020- 8-28 12.43 0.773

There may be still present a partial event. Don and Walt, could you please help out from your stations?

Clear Skies, Petr [2020-08-24 07:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on 18/19 Aug from 18:00 to 21:30 U.T.
Vasilij Ch. [2020-08-19 07:26, Kharkiv] Message sent to observers

· More data were taken for this one by Vladimir Benishek from Sopot and by Vasilij Chiorny from Kharkiv. Current solution:
http://www.asu.cas.cz/~asteroid/01626_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020a_p1.png

More data for both events are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-18 21.08 0.250
2020- 8-21 0.23 0.250
2020- 8-23 3.38 0.250
2020- 8-25 6.53 0.250
2020- 8-27 9.68 0.250
2020- 8-29 12.83 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-19 22.23 0.742
2020- 8-22 1.38 0.742
2020- 8-24 4.53 0.742
2020- 8-26 7.68 0.742
2020- 8-28 10.83 0.742

Clear Skies, Petr [2020-08-18 06:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Additional data was taken for this one by Alessandro Marchini, Riccardo Papini and Fabio Salvaggio from Siena. A likely, but still somewhat tentative solution:
http://www.asu.cas.cz/~asteroid/01626_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01626_2020a_p1.png

More data are needed to nail it down. Event ephemeris for the above solution (but don't limit your observations just to the predicted event times, as the solution is still somewhat tentative):

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-12 13.87 0.253
2020- 8-14 17.57 0.253
2020- 8-16 21.27 0.253
2020- 8-19 0.97 0.253
2020- 8-21 4.67 0.253
2020- 8-23 8.37 0.253
2020- 8-25 12.07 0.253
2020- 8-27 15.77 0.253
2020- 8-29 19.47 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-11 11.84 0.750
2020- 8-13 15.54 0.750
2020- 8-15 19.24 0.750
2020- 8-17 22.94 0.750
2020- 8-20 2.64 0.750
2020- 8-22 6.34 0.750
2020- 8-24 10.04 0.750
2020- 8-26 13.74 0.750
2020- 8-28 17.44 0.750

Clear Skies, Petr [2020-08-10 11:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot on the past two nights, found it to be a binary suspect. A tentative solution:
http://www.asu.cas.cz/~asteroid/01626_2020a_p1.png
http://www.asu.cas.cz/~asteroid/01626_2020a_porb.png

More data are needed to establish it well.

Clear Skies, Petr [2020-08-03 15:33, Ondrejov] Message sent to BinAstPhotSurvey conference

(13491) 1984 UJ1 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/13491.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-25 13:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this on Nov 21.
Don [2020-11-23 02:37, Sugarloaf]

(2510) Shandong (Finished) [Add new note]
· Don Pray observed this return "prime suspect" from Sugarloaf Mountain on 5 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02510_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-24 11:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on the 19th and plan to again tonight, Nov 21 UT.
Don [2020-11-21 00:07, Sugarloaf]

· I observed this new target on Nov 10 and 11.
Don [2020-11-12 17:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

(24658) Misch (Finished) - serious binary candidate, confirmation needed [Add new note]
· Target closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-23 10:28, Ondrejov]

· This new on-list target has been observed extensively by Vladimir Benishek from Sopot, supported with one short session by Peter Kusnirak from here. There are present two rotational lc components:
http://www.asu.cas.cz/~asteroid/24658_2020a_p1.png
http://www.asu.cas.cz/~asteroid/24658_2020a_p2.png
http://www.asu.cas.cz/~asteroid/24658_2020b_p1.png
http://www.asu.cas.cz/~asteroid/24658_2020b_p2.png
There occurred a few attenuations with depths up to 0.08 mag (the deepest one on 2020-10-18.8; see the x-ed points in the last plot above), but the data are insufficient for obtaining P_orb solution yet. More data (errors 0.02 mag) are needed.

Clear Skies, Petr [2020-10-26 08:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot on 8 nights since September 20. There are apparent a few shallow attenuations in his data. (I will post some plots later when I have an opportunity.) It seems that he needs some help to establish a period of the events. Data with errors not greater than 0.02 mag are needed; don't bother in sub-optimal conditions.

Clear Skies, Petr [2020-10-19 13:12, Ondrejov] Message sent to BinAstPhotSurvey conference

(7288) 1991 FE1 (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain, by Romain Montaigut and Arnaud Leroy with OPERA, and by Hana Kucakova and Kamil Hornoch from here: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07288.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-22 07:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this on Nov 19.
Don [2020-11-20 14:30, Sugarloaf]

· We observed this new target on Nov. 17. The period is about 4.9h with an amplitude of 0.5mag. Hope to be able to observe it again for the next few nights. [2020-11-20 09:50, OPERA] Message sent to observers

· Did a run on this on Nov. 15.
Don [2020-11-15 18:09, Sugarloaf] Message sent to BinAstPhotSurvey conference

(88462) 2001 QM99 (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and by Hana Kucakova and Kamil Hornoch from here: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/88462.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-17 13:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this one tonight.
Don [2020-11-10 01:59, Sugarloaf]

· This new target was started by Hana Kucakova and Kamil Hornoch from here as a secondary target to our priority target of the night:
http://www.asu.cas.cz/~asteroid/88462.png

However, we will not be able to take more data for it for a while because of bad weather here. I encourage someone here to take over it.

Clear Skies, Petr [2020-11-09 06:22, Ondrejov] Message sent to BinAstPhotSurvey conference

(6368) Richardmenendez (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 4 nights: Good solution, excellent coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06368.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-13 11:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one tonight (Nov 9 UT).
Don [2020-11-08 23:16, Sugarloaf]

· Started this one on Nov 7.
Don [2020-11-07 21:26, Sugarloaf]

(137311) 1999 TX9 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/137311.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-13 11:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target last night (Oct. 27-28 UT).
Vladimir [2020-10-28 12:07, Sopot AO]

(24038) 1999 SL8 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Reasonable solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/24038.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-13 11:17, Ondrejov] Message sent to BinAstPhotSurvey conference

(7234) 1986 QV3 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Unique solution, limited but acceptable coverage, no deviation.
http://www.asu.cas.cz/~asteroid/07234.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-13 11:15, Ondrejov] Message sent to BinAstPhotSurvey conference

(21242) 1995 WZ41 (Finished) [Add new note]
· This new target was observed by Vladimir Benishek and by Marc Deldem: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/21242.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-11-03 08:00, Ondrejov] Message sent to BinAstPhotSurvey conference

(5135) Nibutani (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4883, copied here for your convenience.

(5135) NIBUTANI
V. Benishek, Belgrade Astronomical Observatory; P. Pravec and P.
Kusnirak, Ondrejov Observatory; D. Pray, Sugarloaf Mountain Observatory,
South Deerfield, MA, U.S.A.; and J. Oey, Blue Mountains Observatory, Leura,
NSW, Australia, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia, a 0.65-m telescope at Ondrejov
Observatory, a 0.50-m telescope at the Sugarloaf Mountain Observatory, and a
0.35-m telescope at the Blue Mountains Observatory during Sept. 13-Oct. 17
reveal that minor planet (5135) is a binary system with an orbital period of
21.736 Â± 0.004 hr. The primary shows a period of 2.81800 Â± 0.00006 hr
and has a lightcurve amplitude of 0.19 mag at solar phases 2-7 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events
that are 0.08 to 0.16 magnitude deep indicate a secondary-to-primary
mean-diameter ratio of 0.28 Â± 0.02. The mean absolute magnitude in the
Cousins R photometric system is H_R = 13.30 Â± 0.03, assuming the phase
relation slope parameter G = 0.24 Â± 0.11.

2020 October 29 (CBET 4883) Daniel W. E. Green

Follow-up observations (with errors not greater than 0.02 mag) would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020-11- 3 23.16 0.262
2020-11- 4 20.89 0.262
2020-11- 5 18.63 0.262
2020-11- 6 16.37 0.262
2020-11- 7 14.10 0.262
2020-11- 8 11.84 0.262
2020-11- 9 9.57 0.262
2020-11-10 7.31 0.262
2020-11-11 5.05 0.262
2020-11-12 2.78 0.262
2020-11-13 0.52 0.262
2020-11-13 22.25 0.262
2020-11-14 19.99 0.262
2020-11-15 17.73 0.262
2020-11-16 15.46 0.262
2020-11-17 13.20 0.262
2020-11-18 10.93 0.262
2020-11-19 8.67 0.262
2020-11-20 6.41 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2020-11- 4 9.78 0.751
2020-11- 5 7.52 0.751
2020-11- 6 5.25 0.751
2020-11- 7 2.99 0.751
2020-11- 8 0.72 0.751
2020-11- 8 22.46 0.751
2020-11- 9 20.20 0.751
2020-11-10 17.93 0.751
2020-11-11 15.67 0.751
2020-11-12 13.40 0.751
2020-11-13 11.14 0.751
2020-11-14 8.88 0.751
2020-11-15 6.61 0.751
2020-11-16 4.35 0.751
2020-11-17 2.08 0.751
2020-11-17 23.82 0.751
2020-11-18 21.56 0.751
2020-11-19 19.29 0.751
2020-11-20 17.03 0.751

Clear Skies, Petr [2020-10-30 07:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for CBET. Our data:
http://www.asu.cas.cz/~asteroid/05135_2020a_porb.png
http://www.asu.cas.cz/~asteroid/05135_2020a_p1.png
http://www.asu.cas.cz/~asteroid/05135_2020b_porb.png
http://www.asu.cas.cz/~asteroid/05135_2020b_p1.png

Cheers, Petr [2020-10-27 12:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 09/24. data sent in [2020-09-29 20:30, Blue Mountains Obs] Message sent to observers

· This one develops very well. Our current data:
http://www.asu.cas.cz/~asteroid/05135_2020a_porb.png
http://www.asu.cas.cz/~asteroid/05135_2020a_p1.png

Just a couple more good runs (errors < 0.02 mag) should do it well enough for CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 1.62 0.255
2020-10- 5 23.35 0.255
2020-10- 6 21.08 0.255
2020-10- 7 18.81 0.255
2020-10- 8 16.54 0.255
2020-10- 9 14.27 0.255
2020-10-10 12.00 0.255
2020-10-11 9.73 0.255
2020-10-12 7.46 0.255
2020-10-13 5.19 0.255
2020-10-14 2.92 0.255
2020-10-15 0.65 0.255
2020-10-15 22.38 0.255
2020-10-16 20.11 0.255
2020-10-17 17.84 0.255
2020-10-18 15.57 0.255
2020-10-19 13.30 0.255
2020-10-20 11.03 0.255
2020-10-21 8.76 0.255
2020-10-22 6.49 0.255
2020-10-23 4.22 0.255
2020-10-24 1.95 0.255
2020-10-24 23.68 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 12.58 0.759
2020-10- 6 10.31 0.759
2020-10- 7 8.04 0.759
2020-10- 8 5.77 0.759
2020-10- 9 3.50 0.759
2020-10-10 1.23 0.759
2020-10-10 22.96 0.759
2020-10-11 20.69 0.759
2020-10-12 18.42 0.759
2020-10-13 16.15 0.759
2020-10-14 13.88 0.759
2020-10-15 11.61 0.759
2020-10-16 9.34 0.759
2020-10-17 7.07 0.759
2020-10-18 4.80 0.759
2020-10-19 2.53 0.759
2020-10-20 0.26 0.759
2020-10-20 21.99 0.759
2020-10-21 19.72 0.759
2020-10-22 17.45 0.759
2020-10-23 15.18 0.759
2020-10-24 12.91 0.759

Clear Skies, Petr [2020-09-29 09:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 02:30 UT to catch the 0.248 phase event.
Don [2020-09-24 00:51, Sugarloaf] Message sent to observers

· Starting a run at 02:20 UT.
Don [2020-09-23 00:51, Sugarloaf]

· More data taken for this one by Don Pray from Sugarloaf Mountain and by Vladimir Benishek from Sopot. Current solution:
http://www.asu.cas.cz/~asteroid/05135_2020a_porb.png
http://www.asu.cas.cz/~asteroid/05135_2020a_p1.png

Just a few more good runs (errors < 0.02 mag) are needed to refine the solution before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-22 9.42 0.248
2020- 9-23 7.17 0.248
2020- 9-24 4.92 0.248
2020- 9-25 2.67 0.248
2020- 9-26 0.42 0.248
2020- 9-26 22.17 0.248
2020- 9-27 19.92 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-21 22.83 0.761
2020- 9-22 20.58 0.761
2020- 9-23 18.33 0.761
2020- 9-24 16.08 0.761
2020- 9-25 13.83 0.761
2020- 9-26 11.58 0.761
2020- 9-27 9.33 0.761

Clear Skies, Petr [2020-09-21 12:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 02:35 UT.
Don [2020-09-21 00:14, Sugarloaf] Message sent to observers

· I plan to start this at 02:40 UT to catch the 0.251 event.
Don [2020-09-20 01:04, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this at 02:50 UT for likely out-of-event coverage.
Don [2020-09-17 01:03, Sugarloaf]

· Vladimir Benishek catched another event from Sopot on the past night. Likely solution:
http://www.asu.cas.cz/~asteroid/05135_2020a_porb.png
http://www.asu.cas.cz/~asteroid/05135_2020a_p1.png

More data (errors <= 0.02 mag) are needed to improve it. Event ephemeris for the likely solution is below, but don't limit your observations just to these times.

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-16 23.25 0.251
2020- 9-17 21.20 0.251
2020- 9-18 19.15 0.251
2020- 9-19 17.10 0.251
2020- 9-20 15.05 0.251
2020- 9-21 13.00 0.251
2020- 9-22 10.95 0.251
2020- 9-23 8.90 0.251
2020- 9-24 6.85 0.251
2020- 9-25 4.80 0.251
2020- 9-26 2.75 0.251
2020- 9-27 0.70 0.251
2020- 9-27 22.65 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-16 13.08 0.788
2020- 9-17 11.03 0.788
2020- 9-18 8.98 0.788
2020- 9-19 6.93 0.788
2020- 9-20 4.88 0.788
2020- 9-21 2.83 0.788
2020- 9-22 0.78 0.788
2020- 9-22 22.73 0.788
2020- 9-23 20.68 0.788
2020- 9-24 18.63 0.788
2020- 9-25 16.58 0.788
2020- 9-26 14.53 0.788
2020- 9-27 12.48 0.788

Clear Skies, Petr [2020-09-16 13:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken by Vladimir Benishek from Sopot and by Don Pray from Sugarloaf Mountain reveal what appears to be a primary event. There are a few solutions for the orbit period; one of them:
http://www.asu.cas.cz/~asteroid/05135_2020a_porb.png
http://www.asu.cas.cz/~asteroid/05135_2020a_p1.png

More data (with errors not greater than 0.02 mag) are needed to nail down.

Clear Skies, Petr [2020-09-16 06:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to observe this at 03:00 UT.
Don [2020-09-15 01:18, Sugarloaf]

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/05135_2020a_p1.png
http://www.asu.cas.cz/~asteroid/05135_2020a_porb.png
(The P_orb value above was set just for plotting purpose. There is no real solution for the orbit period yet, of course.)

I think that Vladimir will appreciate a help by others here. Errors of 0.02 mag are needed; don't bother in sub-optimal conditions.

Clear Skies, Petr [2020-09-14 13:00, Ondrejov] Message sent to BinAstPhotSurvey conference

(3657) Ermolova (Finished) - binary [Add new note]
· Binary discovery apparition finished. [2020-10-27 14:49, Ondrejov]

· And here is an event ephemeris for this binary. High-quality (errors 0.01 mag) follow-up observations would be useful in the next lunation, for future refined modeling.

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 8.90 0.241
2020-10- 5 21.44 0.241
2020-10- 6 9.98 0.241
2020-10- 6 22.52 0.241
2020-10- 7 11.06 0.241
2020-10- 7 23.60 0.241
2020-10- 8 12.14 0.241
2020-10- 9 0.68 0.241
2020-10- 9 13.22 0.241
2020-10-10 1.76 0.241
2020-10-10 14.30 0.241
2020-10-11 2.84 0.241
2020-10-11 15.38 0.241
2020-10-12 3.92 0.241
2020-10-12 16.46 0.241
2020-10-13 5.00 0.241
2020-10-13 17.54 0.241
2020-10-14 6.08 0.241
2020-10-14 18.62 0.241
2020-10-15 7.16 0.241
2020-10-15 19.70 0.241
2020-10-16 8.24 0.241
2020-10-16 20.78 0.241
2020-10-17 9.32 0.241
2020-10-17 21.86 0.241
2020-10-18 10.40 0.241
2020-10-18 22.94 0.241
2020-10-19 11.48 0.241
2020-10-20 0.02 0.241
2020-10-20 12.56 0.241
2020-10-21 1.10 0.241
2020-10-21 13.64 0.241
2020-10-22 2.18 0.241
2020-10-22 14.72 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 2.71 0.747
2020-10- 5 15.25 0.747
2020-10- 6 3.79 0.747
2020-10- 6 16.33 0.747
2020-10- 7 4.87 0.747
2020-10- 7 17.41 0.747
2020-10- 8 5.95 0.747
2020-10- 8 18.49 0.747
2020-10- 9 7.03 0.747
2020-10- 9 19.57 0.747
2020-10-10 8.11 0.747
2020-10-10 20.65 0.747
2020-10-11 9.19 0.747
2020-10-11 21.73 0.747
2020-10-12 10.27 0.747
2020-10-12 22.81 0.747
2020-10-13 11.35 0.747
2020-10-13 23.89 0.747
2020-10-14 12.43 0.747
2020-10-15 0.97 0.747
2020-10-15 13.51 0.747
2020-10-16 2.05 0.747
2020-10-16 14.59 0.747
2020-10-17 3.13 0.747
2020-10-17 15.67 0.747
2020-10-18 4.21 0.747
2020-10-18 16.75 0.747
2020-10-19 5.29 0.747
2020-10-19 17.83 0.747
2020-10-20 6.37 0.747
2020-10-20 18.91 0.747
2020-10-21 7.45 0.747
2020-10-21 19.99 0.747
2020-10-22 8.53 0.747
2020-10-22 21.07 0.747

Clear Skies, Petr [2020-09-29 13:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our report on this one has appeared on CBET 4861, copied below for your convenience.

Cheers, Petr

(3657) ERMOLOVA
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, P. Kusnirak, H. Kucakova, and K. Hornoch, Ondrejov Observatory;
P. Bacci and M. Maestripieri, Astronomical Observatory, San Marcello
Pistoiese, Italy; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia;
V. Benishek, Belgrade Astronomical Observatory; R. Durkee, Shed of Science
South Observatory, Pontotoc, TX, U.S.A.; and A. Marchini and R. Papini,
Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of
Siena, report that photometric observations taken with a 0.50-m telescope at
the Sugarloaf Mountain Observatory, a 0.65-m telescope at Ondrejov
Observatory, a 0.60-m telescope at the San Marcello Pistoiese Observatory,
a 0.35-m telescope at the Blue Mountains Observatory, a 0.35-m telescope at
the Sopot Observatory in Serbia, a 0.50-m telescope at the Shed of Science
South Observatory, and a 0.30-m telescope at the Astronomical Observatory of
the University of Siena during July 19-Sept. 20 reveal that minor planet
(3657) is a binary system with an orbital period of 12.540 Â± 0.003 hr.
The primary shows a period of 2.60655 Â± 0.00006 hr and has a lightcurve
amplitude of 0.20 mag at solar phases 6-11 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.02 to
0.03 magnitude deep indicate a secondary-to-primary mean-diameter ratio of
0.14 Â± 0.03. The mean absolute magnitude in the Cousins R photometric
system is H_R = 12.45 Â± 0.09, assuming the phase relation slope parameter
G = 0.24 Â± 0.11.

2020 September 28 (CBET 4861) Daniel W. E. Green [2020-09-29 07:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Thanks to our high-quality data, we have established this one well despite the shallow events. In fact, this is the smallest satellite (in relative terms, wrt to the primary) we have ever detected with the photometric technique so far. Our data:
http://www.asu.cas.cz/~asteroid/03657_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03657_2020a_p1.png
http://www.asu.cas.cz/~asteroid/03657_2020b_porb.png
http://www.asu.cas.cz/~asteroid/03657_2020b_p1.png
http://www.asu.cas.cz/~asteroid/03657_2020c_porb.png
http://www.asu.cas.cz/~asteroid/03657_2020c_p1.png
http://www.asu.cas.cz/~asteroid/03657_2020d_porb.png
http://www.asu.cas.cz/~asteroid/03657_2020d_p1.png
It's ready for CBET.

Cheers, Petr [2020-09-24 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started in 9/20.
Russ [2020-09-20 02:25, Shed of Science] Message sent to observers

· Just started on 9/19 hope to catch the 0.255 event.

Russ [2020-09-19 02:04, Shed of Science]

· Observed on 09/16 [2020-09-17 20:34, Blue Mountains Obs] Message sent to observers

· I started this at 00:30 UT to catch the 0.255 event.
Don [2020-09-17 01:06, Sugarloaf]

· observed on 08/24 and 08/25 long session [2020-08-26 10:00, Blue Mountains Obs] Message sent to observers

· Thanks to the high-quality extensive data by Don Pray from Sugarloaf Mountain, by Paolo Bacci and Martina Maestripieri from San Marcello Pistoiese, by Vladimir Benishek from Sopot, by Alessandro Marchini from Siena, and by Hana Kucakova and Kamil Hornoch from here, the orbit period of this one has been uniquely resolved to 12.54 h. The satellite is small and the events are shallow, but the observations with errors around 0.01 mag have resolved them well. Lc decomposition:
http://www.asu.cas.cz/~asteroid/03657_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03657_2020a_p1.png
http://www.asu.cas.cz/~asteroid/03657_2020b_porb.png
http://www.asu.cas.cz/~asteroid/03657_2020b_p1.png

More high-quality data (with errors 0.01 mag; don't bother in less than ideal conditions) will be good to further refine the solution, before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-26 16.04 0.255
2020- 8-27 4.58 0.255
2020- 8-27 17.12 0.255
2020- 8-28 5.66 0.255
2020- 8-28 18.20 0.255
2020- 8-29 6.74 0.255
2020- 8-29 19.28 0.255
2020- 9- 5 1.76 0.255
2020- 9- 5 14.30 0.255
2020- 9- 6 2.84 0.255
2020- 9- 6 15.38 0.255
2020- 9- 7 3.92 0.255
2020- 9- 7 16.46 0.255
2020- 9- 8 5.00 0.255
2020- 9- 8 17.54 0.255
2020- 9- 9 6.08 0.255
2020- 9- 9 18.62 0.255
2020- 9-10 7.16 0.255
2020- 9-10 19.70 0.255
2020- 9-11 8.24 0.255
2020- 9-11 20.78 0.255
2020- 9-12 9.32 0.255
2020- 9-12 21.86 0.255
2020- 9-13 10.40 0.255
2020- 9-13 22.94 0.255
2020- 9-14 11.48 0.255
2020- 9-15 0.02 0.255
2020- 9-15 12.56 0.255
2020- 9-16 1.10 0.255
2020- 9-16 13.64 0.255
2020- 9-17 2.18 0.255
2020- 9-17 14.72 0.255
2020- 9-18 3.26 0.255
2020- 9-18 15.80 0.255
2020- 9-19 4.34 0.255
2020- 9-19 16.88 0.255
2020- 9-20 5.42 0.255
2020- 9-20 17.96 0.255
2020- 9-21 6.50 0.255
2020- 9-21 19.04 0.255
2020- 9-22 7.58 0.255
2020- 9-22 20.12 0.255
2020- 9-23 8.66 0.255
2020- 9-23 21.20 0.255
2020- 9-24 9.74 0.255
2020- 9-24 22.28 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-26 9.60 0.742
2020- 8-26 22.14 0.742
2020- 8-27 10.68 0.742
2020- 8-27 23.22 0.742
2020- 8-28 11.76 0.742
2020- 8-29 0.30 0.742
2020- 8-29 12.84 0.742
2020- 9- 5 7.86 0.742
2020- 9- 5 20.40 0.742
2020- 9- 6 8.94 0.742
2020- 9- 6 21.48 0.742
2020- 9- 7 10.02 0.742
2020- 9- 7 22.56 0.742
2020- 9- 8 11.10 0.742
2020- 9- 8 23.64 0.742
2020- 9- 9 12.18 0.742
2020- 9-10 0.72 0.742
2020- 9-10 13.26 0.742
2020- 9-11 1.80 0.742
2020- 9-11 14.34 0.742
2020- 9-12 2.88 0.742
2020- 9-12 15.42 0.742
2020- 9-13 3.96 0.742
2020- 9-13 16.50 0.742
2020- 9-14 5.04 0.742
2020- 9-14 17.58 0.742
2020- 9-15 6.12 0.742
2020- 9-15 18.66 0.742
2020- 9-16 7.20 0.742
2020- 9-16 19.74 0.742
2020- 9-17 8.28 0.742
2020- 9-17 20.82 0.742
2020- 9-18 9.36 0.742
2020- 9-18 21.90 0.742
2020- 9-19 10.44 0.742
2020- 9-19 22.98 0.742
2020- 9-20 11.52 0.742
2020- 9-21 0.06 0.742
2020- 9-21 12.60 0.742
2020- 9-22 1.14 0.742
2020- 9-22 13.68 0.742
2020- 9-23 2.22 0.742
2020- 9-23 14.76 0.742
2020- 9-24 3.30 0.742
2020- 9-24 15.84 0.742

Clear Skies, Petr [2020-08-26 07:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight, ~02:30, Aug 14, UT, and should catch the 0.752 phase event.
Don [2020-08-14 01:05, Sugarloaf] Message sent to observers

· Additional high-quality data were taken for this one by Paolo Bacci and Martina Maestripieri from San Marcello Pistoiese, by Vladimir Benishek from Sopot, and by Don Pray from Sugarloaf Mountain. Despite the events are only 0.03-mag deep, the high-quality data reveal them and the orbital period appears to be unique at 25.1 h:
http://www.asu.cas.cz/~asteroid/03657_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03657_2020a_p1.png

More high-quality data (errors not greater than 0.01 mag) are needed to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8- 8 9.40 0.250
2020- 8- 9 10.50 0.250
2020- 8-10 11.60 0.250
2020- 8-11 12.70 0.250
2020- 8-12 13.80 0.250
2020- 8-13 14.90 0.250
2020- 8-14 16.00 0.250
2020- 8-15 17.10 0.250
2020- 8-16 18.20 0.250
2020- 8-17 19.30 0.250
2020- 8-18 20.40 0.250
2020- 8-19 21.50 0.250
2020- 8-20 22.60 0.250
2020- 8-21 23.70 0.250
2020- 8-23 0.80 0.250
2020- 8-24 1.90 0.250
2020- 8-25 3.00 0.250
2020- 8-26 4.10 0.250
2020- 8-27 5.20 0.250
2020- 8-28 6.30 0.250
2020- 8-29 7.40 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8- 8 21.99 0.752
2020- 8- 9 23.09 0.752
2020- 8-11 0.19 0.752
2020- 8-12 1.29 0.752
2020- 8-13 2.39 0.752
2020- 8-14 3.49 0.752
2020- 8-15 4.59 0.752
2020- 8-16 5.69 0.752
2020- 8-17 6.79 0.752
2020- 8-18 7.89 0.752
2020- 8-19 8.99 0.752
2020- 8-20 10.09 0.752
2020- 8-21 11.19 0.752
2020- 8-22 12.29 0.752
2020- 8-23 13.39 0.752
2020- 8-24 14.49 0.752
2020- 8-25 15.59 0.752
2020- 8-26 16.69 0.752
2020- 8-27 17.79 0.752
2020- 8-28 18.89 0.752
2020- 8-29 19.99 0.752

Clear Skies, Petr [2020-08-03 07:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has observed this return "prime suspect" from Sugarloaf Mountain on 4 nights recently. There is apparent a 0.05-mag deep drop of brightness during the last hour of his night 2020-07-25.3. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/03657_2020a_p1.png
http://www.asu.cas.cz/~asteroid/03657_2020a_porb.png
(The P_orb value was set there just for the plotting purpose. There is no real estimate for the orbit period yet, of course.)

A confirmation (errors < 0.02 mag) is needed. I encourage others here to help out.

Clear Skies, Petr [2020-07-28 12:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one on July 19.

Don [2020-07-20 00:14, Sugarloaf]

· Observed from 2010-12-14 03:10 to 2010-12-14 11:15
good conditions good seeing
Dm = .19
P~2.608h [2010-12-14 13:10, Via Capote] Message sent to observers

· Three good long sessions for this "prime suspect" were taken by Jim from Via Capote and Marek from Skalnate Pleso: multiple coverage, no deviation ,
http://www.asu.cas.cz/~asteroid/03657_b0.png
Done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2010-12-14 10:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2010-12-13 03:00 to 2010-12-13 11:20
good conditions good seeing
Dm = .19
P~2.607h [2010-12-13 13:18, Via Capote] Message sent to observers

· Observed from 2010-12-11 08:00 to 2010-12-11 11:30
high, thin clouds, fair seeing
Dm = .16
P~2.53h [2010-12-11 13:27, Via Capote]

· This one we observed in two nights.
The first estimate of a period is 2.6 hr, very similar to the value from 2006 http://www.asu.cas.cz/~asteroid/3657.png

But the amplitude seems lower than in 2006.
Marek [2010-12-09 08:30, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This one is finished, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-11-05 13:46, Ondrejov]

· Five nights from Skalnate Pleso: a unique period of 2.6064 h, multiple coverage, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/3657.png
There are two more nights by Violeta and Gordana from Rozhen Observatory, so we will wait for them before marking it as finished. But no more data are needed at this moment and we may turn to other targets.

Nice work, Marek et al.!

Cheers, Petr and Peter [2006-08-07 09:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on July 29/30 from 22:30UT to 23:30UT and
July 30/31 from 21:08UT to 2:15UT
[Bulgarian National observatory - Rozhen, Violeta Ivanova and Gordana Apostolovska-Makedonia] [2006-08-04 12:59, Rozhen] Message sent to BinAstPhotSurvey conference

· This object observed from 22:11UT to 01:34UT, July 27/28. Gabo [2006-07-28 01:44, Skalnate Pleso]

· Observed from 22:30 UT to 01:00 UT. Asteroid shows ~3 hours period.
Marek [2006-07-21 16:05, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

(30717) 1937 UD (Finished) [Add new note]
· Good data were taken for this new target by Don Pray and by Marc Deldem: Unique solution, good coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/30717.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-10-26 12:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on Sep 26.
Don [2020-09-28 23:41, Sugarloaf]

(2409) Chapman (Finished) [Add new note]
· This new target was observed by Marc Deldem, Alessandro Marchini and Riccardo Papini: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02409.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, guys!

Petr [2020-10-12 10:46, Ondrejov] Message sent to BinAstPhotSurvey conference

(24106) 1999 VA12 (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4866, copied below for your convenience.

Cheers, Petr

(24106) 1999 VA12
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, H. Kucakova, P. Fatka, K. Hornoch, and P. Kusnirak, Ondrejov
Observatory; and V. Chiorny, Kharkiv Observatory, report that photometric
observations taken with a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.65-m telescope at Ondrejov Observatory, and a 0.70-m
telescope at the Chuguev station of the Kharkiv Observatory in Ukraine during
Aug. 20-Sept. 24 reveal that minor planet (24106) is a binary system with an
orbital period of 22.43 Â± 0.01 hr. The primary shows a period of 4.1856
Â± 0.0003 hr and has a lightcurve amplitude of 0.07 mag at solar phases 8-15
degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.12 magnitude deep indicate a lower limit on the secondary-
to-primary mean-diameter ratio of 0.34. The mean absolute magnitude in the
Cousins R photometric system is H_R = 14.72 Â± 0.08, assuming the phase
relation slope parameter G = 0.24 Â± 0.11.

2020 October 7 (CBET 4866) Daniel W. E. Green [2020-10-08 07:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for CBET too:
http://www.asu.cas.cz/~asteroid/24106_2020a_porb.png
http://www.asu.cas.cz/~asteroid/24106_2020a_p1.png
http://www.asu.cas.cz/~asteroid/24106_2020a_p1_nsp.png

Cheers, Petr [2020-09-29 12:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:10 UT.
Don [2020-09-21 00:13, Sugarloaf] Message sent to observers

· Started this at 01:00 UT to catch the 0.759 phase event.
Don [2020-09-20 01:07, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:40 UT.
Don [2020-09-15 01:19, Sugarloaf]

· Data taken by Don Pray from Sugarloaf Mountain and by Vasilij Chiorny from Kharkiv suggest following solution for this one:
http://www.asu.cas.cz/~asteroid/24106_2020a_porb.png
http://www.asu.cas.cz/~asteroid/24106_2020a_p1.png

It needs to be nailed down with more good-quality data (errors of 0.02 mag are needed; don't bother in less ideal conditions). Below is an event ephemeris for the suggested solution, but don't limit your observations just to these times.

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-15 1.52 0.238
2020- 9-15 23.97 0.238
2020- 9-16 22.42 0.238
2020- 9-17 20.87 0.238
2020- 9-18 19.32 0.238
2020- 9-19 17.77 0.238
2020- 9-20 16.22 0.238
2020- 9-21 14.67 0.238
2020- 9-22 13.12 0.238
2020- 9-23 11.57 0.238
2020- 9-24 10.02 0.238
2020- 9-25 8.47 0.238
2020- 9-26 6.92 0.238

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-14 14.77 0.759
2020- 9-15 13.22 0.759
2020- 9-16 11.67 0.759
2020- 9-17 10.12 0.759
2020- 9-18 8.57 0.759
2020- 9-19 7.02 0.759
2020- 9-20 5.47 0.759
2020- 9-21 3.92 0.759
2020- 9-22 2.37 0.759
2020- 9-23 0.82 0.759
2020- 9-23 23.27 0.759
2020- 9-24 21.72 0.759
2020- 9-25 20.17 0.759
2020- 9-26 18.62 0.759

Clear Skies, Petr [2020-09-14 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this on Sep 12 and 13, UT
Don [2020-09-13 01:33, Sugarloaf]

· Observed this one on 25/26 Aug from 22:00 to 01:15 U,T.
Vasilij Ch. [2020-08-26 02:52, Kharkiv] Message sent to observers

· I observed this tonight on 24/25 Aug from 18:30 to 01:00 U.T.
Vasilij Ch.
[2020-08-25 01:14, Kharkiv]

· Don Pray has observed this new target from Sugarloaf Mountain on 4 nights, found it to have a complex lc. A very tentative lc decomposition (may be wrong):
http://www.asu.cas.cz/~asteroid/24106_2020a_porb.png
http://www.asu.cas.cz/~asteroid/24106_2020a_p1.png

I encourage others here to help out Don. Data with errors < 0.02 mag are needed; don't bother in sub-optimal conditions.

Clear Skies, Petr [2020-08-24 12:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on Aug 20 and am planning a run on it on Aug 21 UT.
Don [2020-08-20 21:27, Sugarloaf]

· I observed this new target on Aug 19 UT.
Don [2020-08-19 19:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

(11220) 1999 JM25 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 nights, found it to have a longish period.
http://www.asu.cas.cz/~asteroid/11220.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-10-01 12:57, Ondrejov]

(4999) MPC (Finished) [Add new note]
· Julian Oey observed this new target from Leura on 21 nights, found it to be a slow rotator. It appears tumbling, though the solution is not unique.
http://www.asu.cas.cz/~asteroid/04999.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-10-01 10:48, Ondrejov]

· continue observing on 06/21, 06/22,06/23, 06/24, 06/28, 06/30, 07/01, 07/02, 07/11 [2020-07-12 21:07, Blue Mountains Obs] Message sent to observers

· start observing this new asteroid over 2 nights 06/15 and 06/19 that started to show a long period. Will continue with it over the next few nights. [2020-06-19 23:38, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(11184) Postma (Finished) [Add new note]
· Target closed. [2020-10-01 10:11, Ondrejov]

· I'm giving up on this one. The field is too crowded.
Don [2020-07-20 00:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this on June 23.
Don [2020-06-24 14:05, Sugarloaf]

(13920) Montecorvino (Finished) - new binary [Add new note]
· Follow-up observations (with errors < 0.02 mag) would be useful for this one, for refined future modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 1.27 0.257
2020-10- 5 16.75 0.257
2020-10- 6 8.22 0.257
2020-10- 6 23.70 0.257
2020-10- 7 15.17 0.257
2020-10- 8 6.65 0.257
2020-10- 8 22.12 0.257
2020-10- 9 13.60 0.257
2020-10-10 5.07 0.257
2020-10-10 20.55 0.257
2020-10-11 12.02 0.257
2020-10-12 3.50 0.257
2020-10-12 18.97 0.257
2020-10-13 10.45 0.257
2020-10-14 1.92 0.257
2020-10-14 17.40 0.257
2020-10-15 8.87 0.257
2020-10-16 0.35 0.257
2020-10-16 15.82 0.257
2020-10-17 7.30 0.257
2020-10-17 22.77 0.257
2020-10-18 14.25 0.257
2020-10-19 5.72 0.257
2020-10-19 21.20 0.257
2020-10-20 12.67 0.257
2020-10-21 4.15 0.257
2020-10-21 19.62 0.257
2020-10-22 11.10 0.257
2020-10-23 2.57 0.257
2020-10-23 18.05 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2020-10- 5 9.15 0.766
2020-10- 6 0.63 0.766
2020-10- 6 16.10 0.766
2020-10- 7 7.58 0.766
2020-10- 7 23.05 0.766
2020-10- 8 14.53 0.766
2020-10- 9 6.00 0.766
2020-10- 9 21.48 0.766
2020-10-10 12.95 0.766
2020-10-11 4.43 0.766
2020-10-11 19.90 0.766
2020-10-12 11.38 0.766
2020-10-13 2.85 0.766
2020-10-13 18.33 0.766
2020-10-14 9.80 0.766
2020-10-15 1.28 0.766
2020-10-15 16.75 0.766
2020-10-16 8.23 0.766
2020-10-16 23.70 0.766
2020-10-17 15.18 0.766
2020-10-18 6.65 0.766
2020-10-18 22.13 0.766
2020-10-19 13.60 0.766
2020-10-20 5.08 0.766
2020-10-20 20.55 0.766
2020-10-21 12.03 0.766
2020-10-22 3.50 0.766
2020-10-22 18.98 0.766
2020-10-23 10.45 0.766

Clear Skies, Petr [2020-09-30 07:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our report on this one has appeared on CBET 4858, copied below for your convenience.

Cheers, Petr

(13920) MONTECORVINO
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; M. Husarik, G. Cervak, and M. Pikler,
Skalnate Pleso Observatory; V. Chiorny, Kharkiv Observatory; V. Benishek,
Belgrade Astronomical Observatory; and P. Sogorb, La Bastide des Jourdans,
France, report that photometric observations taken with a 0.50-m telescope
at the Sugarloaf Mountain Observatory, 0.61-m and 1.3-m telescopes at the
Skalnate Pleso Observatory, a 0.70-m telescope at the Chuguev station of the
Kharkiv Observatory in Ukraine, a 0.35-m telescope at the Sopot Observatory
in Serbia, and a 0.28-m telescope at the Bastidan Observatory in France
during Aug. 13-Sept. 20 reveal that minor planet (13920) is a binary system
with an orbital period of 15.475 Â± 0.005 hr. The primary shows a period
of 2.20231 Â± 0.00009 hr and has a lightcurve amplitude of 0.17 mag at
solar phases 3-6 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.05 to 0.10 magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.22 Â± 0.02.

2020 September 23 (CBET 4858) Daniel W. E. Green [2020-09-24 07:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for CBET. Our data:
http://www.asu.cas.cz/~asteroid/13920_2020b_porb.png
http://www.asu.cas.cz/~asteroid/13920_2020b_p1.png
http://www.asu.cas.cz/~asteroid/13920_2020a_porb.png
http://www.asu.cas.cz/~asteroid/13920_2020a_p1.png

Cheers, Petr [2020-09-22 08:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this around 01:00 UT.
Don [2020-09-21 00:12, Sugarloaf] Message sent to observers

· I started this one at 01:00 UT, and hope to catch the 0.254 phase event..
Don [2020-09-20 01:02, Sugarloaf]

· I observed this one tonight on 15/16 Sept from 22:00 to 01:30 U.T. Vasilij Ch. [2020-09-16 01:51, Kharkiv] Message sent to observers

· Current (revised) solution for this one:
http://www.asu.cas.cz/~asteroid/13920_2020a_porb.png
http://www.asu.cas.cz/~asteroid/13920_2020a_p1.png
http://www.asu.cas.cz/~asteroid/13920_2020b_porb.png
http://www.asu.cas.cz/~asteroid/13920_2020b_p1.png

More high-quality data (errors < 0.015 mag; don't bother in less ideal conditions) are needed to improve the solution (especially to refine D_2/D_1) before we publish it on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-15 1.53 0.254
2020- 9-15 17.01 0.254
2020- 9-16 8.49 0.254
2020- 9-16 23.97 0.254
2020- 9-17 15.45 0.254
2020- 9-18 6.93 0.254
2020- 9-18 22.41 0.254
2020- 9-19 13.89 0.254
2020- 9-20 5.37 0.254
2020- 9-20 20.85 0.254
2020- 9-21 12.33 0.254
2020- 9-22 3.81 0.254
2020- 9-22 19.29 0.254
2020- 9-23 10.77 0.254
2020- 9-24 2.25 0.254
2020- 9-24 17.73 0.254
2020- 9-25 9.21 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2020- 9-14 17.89 0.760
2020- 9-15 9.37 0.760
2020- 9-16 0.85 0.760
2020- 9-16 16.33 0.760
2020- 9-17 7.81 0.760
2020- 9-17 23.29 0.760
2020- 9-18 14.77 0.760
2020- 9-19 6.25 0.760
2020- 9-19 21.73 0.760
2020- 9-20 13.21 0.760
2020- 9-21 4.69 0.760
2020- 9-21 20.17 0.760
2020- 9-22 11.65 0.760
2020- 9-23 3.13 0.760
2020- 9-23 18.61 0.760
2020- 9-24 10.09 0.760
2020- 9-25 1.57 0.760
2020- 9-25 17.05 0.760

Clear Skies, Petr [2020-09-14 12:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on Sep 12 and 13, UT.
Don [2020-09-13 01:32, Sugarloaf]

· I observed this one tonight 10/11 Sept from 19:00 to 01:15 U.T. Vasilij Ch. [2020-09-11 01:37, Kharkiv] Message sent to observers

· Started this one tonight to catch 0.709 phase event.
Vladimir [2020-08-28 21:00, Sopot AO]

· Additional data by Marek Husarik and coll. from Skalnate Pleso and by Don Pray from Sugarloaf Mountain have revealed a likely orbit period of 69.7 h:
http://www.asu.cas.cz/~asteroid/13920_2020a_p1.png
http://www.asu.cas.cz/~asteroid/13920_2020a_p2.png
http://www.asu.cas.cz/~asteroid/13920_2020a_porb.png

The solution still needs to be nailed down, so high-quality observations (errors not greater than 0.015 mag) at any times are needed. Event ephemeris for the likely solution:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-27 16.84 0.265
2020- 9- 8 7.64 0.265
2020- 9-11 5.34 0.265
2020- 9-14 3.04 0.265
2020- 9-17 0.74 0.265
2020- 9-19 22.44 0.265
2020- 9-22 20.14 0.265
2020- 9-25 17.84 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2020- 8-28 23.79 0.709
2020- 9- 6 16.89 0.709
2020- 9- 9 14.59 0.709
2020- 9-12 12.29 0.709
2020- 9-15 9.99 0.709
2020- 9-18 7.69 0.709
2020- 9-21 5.39 0.709
2020- 9-24 3.09 0.709

Clear Skies, Petr [2020-08-26 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 03:20 UT.
Don [2020-08-23 01:06, Sugarloaf]

· Started this one from 21:45 UT.
Marek [2020-08-21 21:50, SkalnatePleso] [Remove]
Message sent to observers

· Did a run on this on Aug 21 UT.
Don [2020-08-21 13:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray took 4 more nights for this one from Sugarloaf Mountain, supported with one night by Vasilij Chiorny from Kharkiv. It turns out to be another 3-period case. There are apprent two rotational lc components and Don catched two superimposed events. While the two rotational lc periods appear unique, there is a number of solutions for the orbit period; a lc decomposition for one of them:
http://www.asu.cas.cz/~asteroid/13920_2020a_p1.png
http://www.asu.cas.cz/~asteroid/13920_2020a_p2.png
http://www.asu.cas.cz/~asteroid/13920_2020a_porb.png

More data with errors < 0.015 mag (don't bother in less ideal conditions) are needed to catch more events and establish their period. As it may be quite long, Don may not be able to establish it uniquely himself and a help by others here will be probably needed.

Clear Skies, Petr [2020-08-21 06:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has observed this new target from Sugarloaf Mountain on two nights, found it to be a binary suspect. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/13920_2020a_p1.png
http://www.asu.cas.cz/~asteroid/13920_2020a_porb.png
(The period in the second plot was set just for plotting purpose. There is no solution for the orbital period yet, of course.)

More data is needed to confirm.

Clear Skies, Petr [2020-08-14 05:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've observed this on Aug 10 and 13 UT, and plan to do a run on it Aug 14 UT.
Don [2020-08-14 00:58, Sugarloaf]

(15491) 1999 CW85 (Finished) [Add new note]
· Don Pray observed this return "prime suspect" from Sugarloaf Mountain on 4 nights in the past week: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/15491_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-09-29 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 01:00 UT.
Don [2020-09-23 00:52, Sugarloaf] Message sent to observers

· I did a run on this returning prime suspect Sep 22 and plan on another Sep 23.
Don [2020-09-22 22:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray did this new target from Sugarloaf Mountain on two nights: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/15491.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2017-11-12 10:45, Ondrejov] Message sent to BinAstPhotSurvey conference

(5220) Vika (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 nights: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05220.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work Don.

Petr [2020-09-25 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this Sep 22 UT.
Don [2020-09-22 15:35, Sugarloaf]

(3989) Odin (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 4 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03989.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-09-17 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this Aug 21 and plan to observe it tonight, Aug 23 UT.
Don [2020-08-23 01:09, Sugarloaf]

(35371) Yokonozaki (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution, sufficient coverage, no significant deviation seen.
http://www.asu.cas.cz/~asteroid/35371.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-09-15 13:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started last night and continued tonight.
Vladimir [2020-09-11 23:04, Sopot AO]

(5452) 1937 NN (Finished) [Add new note]
· Romain Montaigut and Arnaud Leroy observed this return "prime suspect" from OPERA recently: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05452_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work guys.

Petr [2020-09-15 12:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one was done by David from Hunters Hill on three long nights: Unique solution, multiple coverage, no significant deviation. Closed for the Survey, a note with link to David's summary results page put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, David.

Cheers, Petr [2010-07-22 11:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2010 07 16 in reasonable conditions. Data reveals a period of 3.24 +/- 0.02 hrs with an amplitude of 0.55mag +/- 0.02 mag [2010-07-17 01:55, HuntersHill]

(5026) Martes (Finished) - Paired Asteroid [Add new note]
· Done enough for this apparition.

Petr [2020-09-10 07:50, Ondrejov]

· I did a run on this on Aug 21.
Don [2020-08-21 13:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I got a partial LC last night, and am doing another run tonight to, hopefully, finish it.
Don [2013-11-05 01:24, Sugarloaf]

· This paired asteroid has been done sufficiently from Wise and PdM T60.
http://www.asu.cas.cz/~asteroid/005026_a9.png

Cheers, Petr [2009-09-03 09:09, Ondrejov] Message sent to observers

· I am doing 4 objects near to each jumping from one to the next. These are 5026 Martes, 1993 FR27, 6070 Rheinland and 9584 Louchheim. Began ~0200 UT. Can get 7-8 hours each. Joe [2009-08-26 02:27, Dark Sky & PROMPT] Message sent to observers

· This night observed Martes from 21.15 UT. Gabo [2009-08-15 20:19, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(19186) 1991 VY1 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot. Despite the somewhat complex lc shape, which is OK at the non-zero solar phases, it is a good solution. No significant deviation from the single period seen.
http://www.asu.cas.cz/~asteroid/19186.png
http://www.asu.cas.cz/~asteroid/19186_nsp.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Petr [2020-09-08 14:02, Ondrejov] Message sent to BinAstPhotSurvey conference

(6434) Jewitt (Finished) [Add new note]
· Vladimir Benishek observed this one from Sopot in July. A unique period, though the coverage is somewhat limited for the standards of our Survey.
http://www.asu.cas.cz/~asteroid/06434.png
Target closed.

Petr [2020-09-08 08:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target on July 12 UT.
Vladimir [2020-07-13 02:03, Sopot AO]

(3393) Stur (Finished) - 2-period object (probable binary) [Add new note]
· Vladimir Benishek observed this new target from Sopot on 9 nights in June-July. There are present two periods, making it a probable binary, but no events detected, so it has to be confirmed in the future.
http://www.asu.cas.cz/~asteroid/03393_2020a_all.png
http://www.asu.cas.cz/~asteroid/03393_2020a_p1.png
http://www.asu.cas.cz/~asteroid/03393_2020a_p2.png
Target closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-08-27 13:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one last night.
Vladimir [2020-06-25 15:07, Sopot AO]

(14211) 1999 NT1 (Finished) - prime suspect [Add new note]
· The six dropped points in the 2020-07-29.2 session was not confirmed with additional extensive data by Don Pray from Sugarloaf Mountain and Vasilij Chiorny from Kharkiv.
http://www.asu.cas.cz/~asteroid/14211_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-08-21 07:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on Aug 13 UT and plan to observe it tonight, Aug 14 UT.
Don [2020-08-14 00:56, Sugarloaf] Message sent to observers

· I observed this one last night 11/12 Aug in interval 4 hours and tonight 12/13 Aug in interval 5 hours. Vasilij Ch. [2020-08-13 01:01, Kharkiv]

· Don Pray has observed this return "prime suspect" from Sugarloaf Mountain on 4 nights. Captured what may be a 0.08-mag deep partial event on the last night:
http://www.asu.cas.cz/~asteroid/14211_2020a_p1.png
http://www.asu.cas.cz/~asteroid/14211_2020a_porb.png
(The P_orb value was set there just for plotting purpose. No real solution for the orbit period yet, of course.)

A confirmation (errors < 0.02 mag) is needed. I encourage others here to help out.

Clear Skies, Petr [2020-07-30 07:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on July 25 UT.
Don [2020-07-25 20:18, Sugarloaf]

· This night this object from ~20 UT. Gabo [2013-08-02 21:17, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This return "prime suspect" was done in its current second apparition by Kamil Hornoch, Peter Kusnirak and Jan Vrastil from here (4 linked nights), supported with one overlapping relative night by Jozef Vilagi and Leos Kornos from Modra: Unique solution, multiple coverage, no deviation,
http://www.asu.cas.cz/~asteroid/14211_b3.png
Done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-07-16 11:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to observe tonight. I will start at 21 UT. Sky looks good. Peter K. [2013-07-15 19:28, Ondrejov] Message sent to observers

· Started a run on this one at 21:15 UT in rather worse conditions. Best wishes, Kamil [2013-07-13 21:17, Ondrejov]

· I plan to get full-night run for this one tonight. Best wishes, Kamil [2013-07-12 20:06, Ondrejov] Message sent to observers

· Observed tonight for several hours. Jozef, Leos. [2013-07-10 02:35, Modra]

· Nice work on this one, Peter and Don. Yes, it is well done for the Survey,
http://www.asu.cas.cz/~asteroid/14211.png
A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr Pravec [2006-08-01 13:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· "This one has been observed from Carbuncle Hill Observatory, Ondrejov and Modra (9 nights in all) and it is finished for the Survey now (unique solution, multiple coverage and no significant deviation). Petr Pravec will put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm after his hollidays. [2006-07-26 09:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 4.5 hours last night (Jul 21/22). Peter K. [2006-07-22 02:19, Ondrejov]

· Observing from 20:50 UT and expecting full-night run. Peter K. [2006-07-19 22:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 4.5 hours last night. Peter K. [2006-07-19 07:47, Ondrejov]

· Will start this at ~23:10, July 18 UT.
Don [2006-07-18 01:37, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Will start this at ~23:20, July 17 UT.

Don [2006-07-17 00:34, CarbuncleHill]

· Observing from 21 UT and expecting full-night run (~4.5 hours). Peter K. [2006-07-16 22:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one tonight, July 14 UT.

Don [2006-07-14 02:05, CarbuncleHill]

(14211) 1992 NT1 (Finished) - Prime suspect [Add new note]
· Item closed. [2020-07-28 12:24, Ondrejov]

· Incorrect name for this.
Don [2020-07-25 20:20, Sugarloaf]

(19560) 1999 JH81 (Finished) [Add new note]
· Target closed. (Data insufficient for the Survey.) [2020-07-28 12:23, Ondrejov]

· I observed this one on July 19 and 21.
Don [2020-07-24 01:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I've done 2 sessions on this, the last being on June 23.
Don [2020-06-24 14:08, Sugarloaf]

(77232) 2001 FA38 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/77232.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-26 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on June 13 UT.
Don [2020-06-13 18:46, Sugarloaf] Message sent to observers

· I started this one on June 1, UT.
Don [2020-06-02 00:21, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5909) Nagoya (Finished) - binary suspect [Add new note]
· Julian Oey observed this return "prime suspect" (i.e., asteroid with P and A in the range where binaries are frequent) from Leura on 13 nights in the past apparition. He captured two attenuations that may be partial mutual events in a binary.
http://www.asu.cas.cz/~asteroid/05909_2019a_porb.png
http://www.asu.cas.cz/~asteroid/05909_2019b_porb.png
http://www.asu.cas.cz/~asteroid/05909_2019c_porb.png
The suspect binarity needs to be confirmed with thorough observations in the future.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-26 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 10/18, 10/19, 10/23, 10/24, 10/27, 10/31. Data submitted [2020-05-03 04:13, Blue Mountains Obs] Message sent to observers

· also additional data obtained on 09/23, 09/27, 10/02, 10/03, [2020-05-03 04:12, Blue Mountains Obs]

· observed on 08/23,08/24,08/28,09/01,09/03 [2019-09-08 09:30, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek did this new target from Sopot on two long nights: Unique solution, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/05909.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Cheers, Petr [2016-12-12 13:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one last night (Dec. 08-09, 17:26-02:47 UT).

Vladimir [2016-12-09 11:53, Sopot AO]

(37591) 1991 TD4 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 6 nights:
http://www.asu.cas.cz/~asteroid/37591.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-22 10:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on June 13, UT
Don [2020-06-13 18:45, Sugarloaf]

· Started this on June 1, UT.
Don [2020-06-02 00:23, Sugarloaf]

(3913) Chemin (Finished) [Add new note]
· This return "prime suspect" was done by Vladimir Benishek and Bruno Christmann: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/03913_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-15 08:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· This returning "prime suspect" has been done by Kamil from here and by Adrian from Modra: Period refined, multiple coverage, no deviation,
http://www.asu.cas.cz/~asteroid/03913_a9.png
Done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Kamil and Adrian.

Cheers, Petr [2009-04-06 09:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will be observing this one from ~01:30 UT. Best wishes, Kamil [2009-03-31 00:27, Ondrejov]

(38079) 1999 HF (Finished) - fully synchronous binary [Add new note]
· Our report on this one has appeared on CBET 4795, copied below for your convenience.

Cheers, Petr

(38079) 1999 HF
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia; W.
Cooney, B. Flanagan, and B. Pellerin, Madrona Peak Observatory, Medina, TX,
U.S.A.; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A., report that photometric observations taken with a 0.35-m telescope
at the Sopot Observatory in Serbia, a 0.35-m telescope at the Blue Mountains
Observatory, a 0.6-m telescope at the Madrona Peak Observatory, and a 0.50-m
telescope at the Shed of Science South Observatory during Mar. 27-May 24
reveal that minor planet (38079) is a binary system with an orbital period of
16.675 Â± 0.009 hr. Mutual eclipse/occultation events observed from Mar. 27
to Apr. 11 were 0.57- to 0.67-magnitude deep and they indicated a lower limit
on the secondary-to-primary mean-diameter ratio of 0.83. Rotations of the
components appear to be synchronous with the orbital motion, and an amplitude
of the combined primary-plus-secondary rotational lightcurve is 0.42 mag at
solar phases 5-15 deg.

2020 June 11 (CBET 4795) Daniel W. E. Green [2020-06-11 06:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have finished this fully synchronous binary, it's ready for a CBET. Our data:
http://www.asu.cas.cz/~asteroid/38079_2020a.png
http://www.asu.cas.cz/~asteroid/38079_2020b.png
http://www.asu.cas.cz/~asteroid/38079_2020c.png
http://www.asu.cas.cz/~asteroid/38079_2020d.png
http://www.asu.cas.cz/~asteroid/38079_2020e.png
The system apparently moved gradually away from equator-on geometry over the two-month observing interval.

Cheers, Petr [2020-06-10 06:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current data for this fully synchronous binary:
http://www.asu.cas.cz/~asteroid/38079.png

There is an interesting evolution of the mutual events --- it looks like the system is moving away from event geometry. More data (errors <= 0.03 mag) are needed. It will be ready for CBET then. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 5-10 14.94 0.254
2020- 5-11 7.62 0.254
2020- 5-12 0.29 0.254
2020- 5-12 16.97 0.254
2020- 5-13 9.64 0.254
2020- 5-14 2.32 0.254
2020- 5-14 18.99 0.254
2020- 5-15 11.67 0.254
2020- 5-16 4.34 0.254
2020- 5-16 21.02 0.254
2020- 5-17 13.69 0.254
2020- 5-18 6.37 0.254
2020- 5-18 23.04 0.254
2020- 5-19 15.72 0.254
2020- 5-20 8.39 0.254
2020- 5-21 1.07 0.254
2020- 5-21 17.74 0.254
2020- 5-22 10.42 0.254
2020- 5-23 3.09 0.254
2020- 5-23 19.77 0.254
2020- 5-24 12.44 0.254
2020- 5-25 5.12 0.254
2020- 5-25 21.79 0.254
2020- 5-26 14.47 0.254
2020- 5-27 7.14 0.254
2020- 5-27 23.82 0.254
2020- 5-28 16.49 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2020- 5-10 23.37 0.759
2020- 5-11 16.04 0.759
2020- 5-12 8.72 0.759
2020- 5-13 1.39 0.759
2020- 5-13 18.07 0.759
2020- 5-14 10.74 0.759
2020- 5-15 3.42 0.759
2020- 5-15 20.09 0.759
2020- 5-16 12.77 0.759
2020- 5-17 5.44 0.759
2020- 5-17 22.12 0.759
2020- 5-18 14.79 0.759
2020- 5-19 7.47 0.759
2020- 5-20 0.14 0.759
2020- 5-20 16.82 0.759
2020- 5-21 9.49 0.759
2020- 5-22 2.17 0.759
2020- 5-22 18.84 0.759
2020- 5-23 11.52 0.759
2020- 5-24 4.19 0.759
2020- 5-24 20.87 0.759
2020- 5-25 13.54 0.759
2020- 5-26 6.22 0.759
2020- 5-26 22.89 0.759
2020- 5-27 15.57 0.759
2020- 5-28 8.24 0.759

Clear Skies, Petr [2020-05-04 14:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed for several nights on 03/31, 04/12, 04/13, 04/17, 04/18 and 04/24. [2020-04-26 09:36, Blue Mountains Obs] Message sent to observers

· Working from Madona Peak again tonight. -Walt [2020-04-26 02:18, Sonoita]

· Just started a run on this tonight.

Russ [2020-04-24 03:57, Shed of Science] Message sent to observers

· Planning to work this asteroid from Madrona Peak tonight.
-Walt [2020-04-23 22:43, Sonoita]

· Vladimir Benishek observed this off-list target from Sopot on three nights March 27-29, found there a sharp minimum with "shoulders" that is characteristic for fully synchronous binaries. The period is 25 hours. He would appreciate a help by observers from substantially different longitudes (e.g., from America)

Clear Skies, Petr [2020-03-31 07:48, Ondrejov] Message sent to BinAstPhotSurvey conference

(2171) Kiev (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4794, copied below for your convenience.

Cheers, Petr

(2171) KIEV
D. Romeuf, Chapdes-Beaufort, Lyon 1 University, France; D. Augustin,
Anglet, France; R. Behrend, Geneva Observatory, Switzerland; V. Benishek,
Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; B.
Christmann, J. Michelet, and R. Montaigut, Club d'Astronomie de Lyon Ampere,
France; E. Barbotin, Etriac, France; P. Sogorb, La Bastide des Jourdans,
France; R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.;
F. Manzini, Stazione Astronomica di Sozzago, Italy; and F. Sold, Observatorio
Amanecer de Arrakis, Sevilla, Spain, report that photometric observations
taken with a 0.36-m telescope at Pommier Observatory in France, a 0.14-m
refractor at "Deep Sky Chile" observatory in Chile, a 0.35-m telescope at the
Sopot Observatory in Serbia, a 0.28-m telescope at the La Souchere Observatory
in France, a 0.50-m telescope at the La Grande Vallee Observatory in France, a
0.28-m telescope at the Bastidan Observatory in France, a 0.50-m telescope at
the Shed of Science South Observatory, a 0.40-m telescope at the Stazione
Astronomica di Sozzago, and a 0.20-m telescope at the Observatorio Amanecer de
Arrakis during Apr. 15-June 2 reveal that minor planet (2171) is a binary
system with an orbital period of 22.96 Â± 0.01 hr. The primary shows a
period of 3.1716 Â± 0.0002 hr and has a lightcurve amplitude of 0.11 mag at
solar phases 6-7 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.06 to 0.12 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.24. The
secondary appears synchronous and has a light-curve amplitude (in the combined
primary-plus-secondary light curve) of 0.02-0.03 mag, suggesting a moderately
elongated shape with an equatorial-axis ratio of 1.3.

2020 June 10 (CBET 4794) Daniel W. E. Green [2020-06-10 06:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been established primarily by a team of French observers (outside this group), supported with data by a few others (including members of this group). Doing a CBET now. Our complete data:
http://www.asu.cas.cz/~asteroid/02171_2020c_porb.png
http://www.asu.cas.cz/~asteroid/02171_2020c_p1.png
http://www.asu.cas.cz/~asteroid/02171_2020b_porb.png
http://www.asu.cas.cz/~asteroid/02171_2020b_p1.png
http://www.asu.cas.cz/~asteroid/02171_2020a_porb.png
http://www.asu.cas.cz/~asteroid/02171_2020a_p1.png

Cheers, Petr [2020-06-08 06:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot, obtained 5 partial nights. There appear two lc components; a tentative decomposition:
http://www.asu.cas.cz/~asteroid/02171_2020a_p1.png
http://www.asu.cas.cz/~asteroid/02171_2020a_p2.png
More data (with errors not greater than 0.02 mag, and preferably long sessions) are needed to establish it. As the second period appears nearly commensurate with Earth's rotation ---the 8.13 h plotted above is one of several possible solutions, all about commensurate with 1 day---, at least one good long session from a substantially different longitude (America) will be needed to resolve.

Clear Skies, Petr [2020-04-24 07:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this new target last night.
Vladimir [2020-04-15 10:55, Sopot AO]

(7717) Tabeisshi (Finished) [Add new note]
· Julian Oey observed this one extensively from Leura, found it to be a very slow rotator. There are signs of tumbling --- deviations from the mean curve.
http://www.asu.cas.cz/~asteroid/07717.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-08 10:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Continue with data collection in April and May
over 15 separate nights to arrive to a rotation period of 434 h. [2020-05-09 10:28, Blue Mountains Obs] Message sent to observers

· I started this new target on the 03/16 but was not able to determine the nature of the lightcurve until now. It turned out to be a long period of about 300h. Observed on 03/16, 03/17, 03/18, 03/20,03/21,03/22, 03/27 [2020-03-29 02:55, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3627) Sayers (Finished) [Add new note]
· Bruno Christmann observed this one, found it to be a low-amplitude object with longish period.
http://www.asu.cas.cz/~asteroid/03627.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-08 09:38, Ondrejov] Message sent to BinAstPhotSurvey conference

(2716) Tuulikki (Finished) [Add new note]
· Don Pray observed this one from Sugarloaf Mountain, found it to be a low-amplitude object with a longish period.
http://www.asu.cas.cz/~asteroid/02716.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-08 09:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one on Aug 6 UT.
Don [2019-08-06 20:51, Sugarloaf]

(15710) Bocklin (Finished) [Add new note]
· Also this one was observed by Vladimir Benishek from Sopot: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/15710.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-08 09:10, Ondrejov] Message sent to BinAstPhotSurvey conference

(7910) Aleksola (Finished) [Add new note]
· Vladimir Benishek observed this one from Sopot: Good solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07910.png
Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-08 09:01, Ondrejov] Message sent to BinAstPhotSurvey conference

(27612) 2001 KG25 (Finished) [Add new note]
· Insufficient data, target closed. [2020-06-08 08:55, Ondrejov]

· Started this one tonight.
Vladimir [2019-08-30 20:30, Sopot AO] Message sent to BinAstPhotSurvey conference

(2389) Dibaj (Finished) - slow rotator [Add new note]
· This slow rotator is closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-08 08:46, Ondrejov]

· Observed on July 27 (00:01-01:51 UT) and July 27-28 (23:07-01:58 UT).
Vladimir [2019-07-29 11:54, Sopot AO] Message sent to BinAstPhotSurvey conference

(2500) Alascattalo (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4791, copied below for your convenience.

Cheers, Petr

(2500) ALASCATTALO
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; A.
Marchini, R. Papini, and F. Salvaggio, Dipartimento di Scienze Fisiche, Della
Terra e Dell'Ambiente, University of Siena; J. Oey, Blue Mountains
Observatory, Leura, NSW, Australia; D. Pray, Sugarloaf Mountain Observatory,
South Deerfield, MA, U.S.A.; R. Durkee, Shed of Science South Observatory,
Pontotoc, TX, U.S.A.; W. Cooney, J. Gross, and D. Terrell, Sonoita Research
Observatory, Sonoita, AZ, U.S.A.; R. Goncalves, Linhaceira Observatory,
Tomar, Portugal; A. Aznar, Isaac Aznar Observatory, Alcublas, Valencia,
Spain; C. Odden, Phillips Academy, Andover, MA, U.S.A.; and J. Kemp,
Middlebury College, Middlebury, VT, U.S.A., report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia,
a 0.35-m telescope at the Organ Mesa Observatory, a 0.30-m telescope at the
Astronomical Observatory of the University of Siena, a 0.35-m telescope at the
Blue Mountains Observatory, a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.50-m telescope at the Shed of Science South Observatory, a
0.50-m telescope at the Sonoita Research Observatory, a 0.35-m telescope at
the Linhaceira Observatory, a 0.35-m telescope at the Isaac Aznar Observatory,
and a 0.50-m telescope at the Mittelman Observatories at New Mexico Skies
during Mar. 20-May 19 reveal that minor planet (2500) is a binary system
with an orbital period of 169.1 Â± 0.3 hr. The primary shows a period of
2.75123 Â± 0.00009 hr and has a lightcurve amplitude of 0.19 magnitude at
solar phases 2-17 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.15 to 0.27 magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.39 Â± 0.02.

2020 June 7 (CBET 4791) Daniel W. E. Green [2020-06-08 06:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Also this one is finished, doing a CBET now. Our data:
http://www.asu.cas.cz/~asteroid/02500_2020a_p1.png
http://www.asu.cas.cz/~asteroid/02500_2020a_porb.png

Cheers, Petr [2020-06-02 07:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Also this one is close to be published on CBET. Current solution:
http://www.asu.cas.cz/~asteroid/02500_2020a_porb.png
http://www.asu.cas.cz/~asteroid/02500_2020a_p1.png

There is an interesting evolution of the mutual events and it would be good to take more data for them. Errors not greater than 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 5-13 7.4 0.278
2020- 5-20 8.6 0.278
2020- 5-27 9.8 0.278

Date/Time UTC (LTc.) Phase
--------------------------
2020- 5-16 11.0 0.724
2020- 5-23 12.2 0.724

Clear Skies, Petr [2020-05-04 13:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work from SRO tonight. -Walt [2020-05-02 23:15, Sonoita] Message sent to observers

· Starting in good conditions tonight.

Russ [2020-04-30 02:49, Shed of Science]

· Will work from SRO tonight. -Walt [2020-04-27 00:08, Sonoita]

· Starting in good conditions.

Russ [2020-04-25 03:45, Shed of Science] Message sent to observers

· New data by Frederick Pilcher and by Russ Durkee joined in. Frederick covered about 70% of the primary event, in agreement with the 169.3-h orbit period. Russ' data is of a high quality and it was taken outside the deep events, but there is apparent an interesting feature, apparently a shallow attenuation (depth 0.05 mag), see the 3rd plot below.
http://www.asu.cas.cz/~asteroid/02500_2020a_p1.png
http://www.asu.cas.cz/~asteroid/02500_2020a_porb.png
http://www.asu.cas.cz/~asteroid/02500_2020a_porb_phase0p446_zoom32x.png
It might be a (partial) event of another, smaller satellite. But we need to confirm it with more high-quality data. Of course, its orbit period is unknown. So, if you want to try to confirm it, take high-quality data (errors 0.01 mag) at any time.

Clear Skies, Petr [2020-04-24 07:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data taken for this one by Alessandro Marchini from University of Siena, by Julian Oey from Leura, by Don Pray from Sugarloaf Mountain, and by Frederick Pilcher. (Sorry that I don't have a time to reply to you all individually now.) Particularly useful have been the data by Alessandro and by Frederick who captured two and one event, respectively. The solution appears good now:
http://www.asu.cas.cz/~asteroid/02500_2020a_porb.png
http://www.asu.cas.cz/~asteroid/02500_2020a_p1.png

More data (with errors 0.02 mag or better) would be still useful to improve the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-22 3.7 0.277
2020- 4-29 5.0 0.277

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-25 8.5 0.730
2020- 5- 2 9.8 0.730

Clear Skies, Petr [2020-04-20 09:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started on this one.

Russ [2020-04-20 03:43, Shed of Science] Message sent to observers

· observed on 04/12, 04/13, 04/16 and 04/18
unfortunately both 04/13 and 04/18 were outside the event. [2020-04-19 10:41, Blue Mountains Obs]

· Recent data by Russ Durkee doesn't support the candidate P_orb of 113 h suggested earlier. Instead, the complete data suggest that it is 169.5 h, 1.5 times 113 h. More data are needed to confirm. Below is an updated event ephemeris, but take data at any time, as the solution is still uncertain.

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-18 7.6 0.233
2020- 4-25 9.1 0.233
2020- 5- 2 10.6 0.233

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-22 4.7 0.782
2020- 4-29 6.2 0.782

Clear Skies, Petr [2020-04-16 07:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will start this one shortly.

Russ [2020-04-15 03:58, Shed of Science] Message sent to observers

· More data taken for this one by Vladimir Benishek, Frederick Pilcher, and Julian Oey. Solution for P_orb is still not unique, though a likely period is 113 h:
http://www.asu.cas.cz/~asteroid/02500_2020a_porb.png
http://www.asu.cas.cz/~asteroid/02500_2020a_p1.png

An event ephemeris for the 113-h period solution is below. However, it may be wrong so take data (with errors < 0.03 mag) at any time.

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-13 14.8 0.253
2020- 4-18 7.8 0.253
2020- 4-23 0.8 0.253
2020- 4-27 17.8 0.253
2020- 5- 2 10.8 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-11 6.1 0.752
2020- 4-15 23.1 0.752
2020- 4-20 16.1 0.752
2020- 4-25 9.1 0.752
2020- 4-30 2.1 0.752

Clear Skies, Petr [2020-04-08 07:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 04/05 Starting at 13:04 UT [2020-04-06 09:07, Blue Mountains Obs] Message sent to observers

· More data taken by Vladimir Benishek, Frederick Pilcher and Don Pray, two more events captured. There are several possible values for P_orb, a solution for one of them:
http://www.asu.cas.cz/~asteroid/2500_2020a_porb.png
http://www.asu.cas.cz/~asteroid/2500_2020a_p1.png

More data are needed to resolve.

Clear Skies, Petr [2020-04-06 08:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 04:40 UT.

Don [2020-03-28 01:40, Sugarloaf]

· Observing this one tonight (Mar. 27-28).
Vladimir [2020-03-27 22:16, Sopot AO] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek observed this off-list target from Sopot on parts of two nights March 20 and 21. While this data is too limited for a good solution yet, there appear to be deviations that may be due to a satellite. Weather forecast for Vladimir's site is poor for these nights and he would appreciate a help by others here.

Clear Skies, Petr [2020-03-24 11:46, Ondrejov] Message sent to BinAstPhotSurvey conference

(1401) Lavonne (Finished) [Add new note]
· Russ Durkee observed this return "prime suspect" from Shed of Science South on 2 nights:
http://www.asu.cas.cz/~asteroid/01401_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-05 10:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Finally a clear night. Starting this one.

Russ [2020-03-25 02:14, Shed of Science] Message sent to observers

· Will start a short tun on this one later tonight if the weather holds.

Russ [2020-02-25 02:28, Shed of Science] Message sent to BinAstPhotSurvey conference

· This return "prime suspect" was observed by Bruno Christmann and by Romain Montaigut and Arnaud Leroy from OPERA: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01401_b8.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work guys.

Petr [2018-10-01 10:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Roger Groom and Julian Oey did this return "prime suspect" from Perth on five nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01401_b7.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-04-03 12:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 03/23, 03/28, 03/30, 03/31. [2017-04-01 08:37, Blue Mountains Obs] Message sent to observers

· started this new target from Perth (Groom) initial period is 3.94h [2017-03-20 11:50, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· One night by Vasilij Chiorny from Kharkiv and another one by Russ Durkee from Shed of Science Observatory joined with the three nights from Skalnate Pleso: the object is done for the Survey,
http://www.asu.cas.cz/~asteroid/01401.png
Note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2008-08-18 07:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· The third night by Zuzana and Marek from S. Pleso has completed coverage:
http://www.asu.cas.cz/~asteroid/01401.png
It should be done after joining in Russ' session.

Cheers, Petr [2008-08-08 07:44, Ondrejov] Message sent to observers

· Zuzana at Skalnate Pleso Observatory has taken 4.3 hr long run in the past night (7-8). The period is 3.9333 and the amplitude 0.26 mag.
I think it can be finished.
Marek [2008-08-08 06:56, SkalnatePleso] [Remove]
Message sent to observers

· Just starting a run on Lavonne under good conditions. Assuming no fog, I should be able to cover it for the next 4.5 hours or so. Not a long run, but hopefully enough for this one.

Russ [2008-08-08 05:33, Shed of Science] Message sent to BinAstPhotSurvey conference

· Two nights Aug. 4.0 and 5.0 (1.9 and 4.3h long) by Marek and Michal from Skalnate Pleso have given a unique period solution:
http://www.asu.cas.cz/~asteroid/01401.png
One more full night would do it. They have got bad conditions on the past two nights, and forecast for tonight is uncertain. A help (one full night) from another station would be appreciated.

Clear Skies, Petr [2008-08-07 13:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· The period estimation is on 3.93 hr and amplitude 0.26 mag after two nights. [2008-08-05 07:24, SkalnatePleso] [Remove]
Message sent to observers

· Observing in good conditions, started at 22:30 UT. Michal [2008-08-04 23:27, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(3863) Gilyarovskij (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain, found it to have a longish period of 12.96 h.
http://www.asu.cas.cz/~asteroid/03863_c0.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-06-02 09:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on May 21+22.
Don [2020-05-22 20:10, Sugarloaf]

(1480) Aunus (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4789, copied below for your convenience.

Cheers, Petr

(1480) AUNUS
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia;
R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; C. Odden,
Phillips Academy, Andover, MA, U.S.A.; W. Cooney, Starry Night Observatory,
Columbus, TX, U.S.A.; J. Kemp, Middlebury College, Middlebury, VT, U.S.A.;
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; J.
Gross and D. Terrell, Sonoita Research Observatory, Sonoita, AZ, U.S.A.; and
A. Aznar, Isaac Aznar Observatory, Alcublas, Valencia, Spain, report that
photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.35-m telescope at the Blue Mountains Observatory,
a 0.50-m telescope at the Shed of Science South Observatory, a 0.50-m
telescope at the Phillips Academy Observatory, a 0.50-m telescope at the
Starry Night Observatory, a 0.50-m telescope at the Mittelman Observatories
at New Mexico Skies, a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.50-m telescope at the Sonoita Research Observatory, and a
0.35-m telescope at the Isaac Aznar Observatory during Mar. 21-May 19 reveal
that minor planet (1480) is a binary system with an orbital period of 19.714
Â± 0.003 hr. The primary shows a period of 5.1600 Â± 0.0002 hr and has a
lightcurve amplitude of 0.16 magnitude at solar phases 2-18 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.09 to 0.20 magnitude deep indicate a lower limit on the secondary-to-
primary mean-diameter ratio of 0.30.

2020 June 2 (CBET 4789) Daniel W. E. Green [2020-06-02 07:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have finished observations of this one, doing a CBET now. Our data:
http://www.asu.cas.cz/~asteroid/01480_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01480_2020a_p1.png

An unusual feature of this binary is that the P_1 is relatively long, 5.16 h. But it is securely determined; in particular, a period half that is ruled out as there are small but significant deviations from mean lightcurve when folded with a period of 2.58 h. It will be interesting what future studies reveal for it.

Cheers, Petr [2020-05-31 07:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work this one tonight...

Russ [2020-05-19 03:52, Shed of Science] Message sent to observers

· Will work from Starry Night Observatory in Columbus tonight.
-Walt [2020-05-18 22:38, Sonoita]

· observed on 05/10 centre at the 0.25 phase event. [2020-05-11 08:41, Blue Mountains Obs] Message sent to observers

· observed 05/03 to capture the 0.75 phase event at 23.14 [2020-05-05 02:26, Blue Mountains Obs]

· This one is close to be published on CBET. Just one more good coverage of the secondary event is needed. (Monitoring the primary event will be useful too.) Our current data:
http://www.asu.cas.cz/~asteroid/01480_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01480_2020a_p1.png

Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 5-10 22.47 0.248
2020- 5-11 18.18 0.248
2020- 5-12 13.89 0.248
2020- 5-13 9.60 0.248
2020- 5-14 5.31 0.248
2020- 5-15 1.02 0.248
2020- 5-15 20.73 0.248
2020- 5-16 16.44 0.248
2020- 5-17 12.15 0.248
2020- 5-18 7.86 0.248
2020- 5-19 3.57 0.248
2020- 5-19 23.28 0.248
2020- 5-20 18.99 0.248
2020- 5-21 14.70 0.248
2020- 5-22 10.41 0.248
2020- 5-23 6.12 0.248
2020- 5-24 1.83 0.248
2020- 5-24 21.54 0.248
2020- 5-25 17.25 0.248
2020- 5-26 12.96 0.248
2020- 5-27 8.67 0.248
2020- 5-28 4.38 0.248
2020- 5-29 0.09 0.248
2020- 5-29 19.80 0.248
2020- 5-30 15.51 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2020- 5-10 12.71 0.753
2020- 5-11 8.42 0.753
2020- 5-12 4.13 0.753
2020- 5-12 23.84 0.753
2020- 5-13 19.55 0.753
2020- 5-14 15.26 0.753
2020- 5-15 10.97 0.753
2020- 5-16 6.68 0.753
2020- 5-17 2.39 0.753
2020- 5-17 22.10 0.753
2020- 5-18 17.81 0.753
2020- 5-19 13.52 0.753
2020- 5-20 9.23 0.753
2020- 5-21 4.94 0.753
2020- 5-22 0.65 0.753
2020- 5-22 20.36 0.753
2020- 5-23 16.07 0.753
2020- 5-24 11.78 0.753
2020- 5-25 7.49 0.753
2020- 5-26 3.20 0.753
2020- 5-26 22.91 0.753
2020- 5-27 18.62 0.753
2020- 5-28 14.33 0.753
2020- 5-29 10.04 0.753
2020- 5-30 5.75 0.753

Clear Skies, Petr [2020-05-04 13:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one tonight as well.

Russ [2020-04-30 02:50, Shed of Science] Message sent to observers

· Obtained data for 04/26 capturing the 0.75 phase event [2020-04-27 05:59, Blue Mountains Obs]

· observed on 04/24 to cover part of the 0.25 phase and 04/25 covering first half of the 0.75 phase. [2020-04-26 04:14, Blue Mountains Obs] Message sent to observers

· More data taken for this one by Vladimir Benishek from Sopot, by Walt Cooney and coll. from SRO, and by Don Pray from Sugarloaf Mountain. Thanks to the data from America, the primary period is unique now. As for the orbital period, there are two solutions, 19.7 h or twice that; a lc decomposition for the shorter P_orb:
http://www.asu.cas.cz/~asteroid/01480_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01480_2020a_p1.png

Enclosed below is an event ephemeris for the 19.7-h period. For the 39.4-h period, only the 0.25-phase events will occur. So, covering times around the predicted 0.745-phase events below will be critical for resolving the P_orb ambiguity.

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-23 16.62 0.251
2020- 4-24 12.33 0.251
2020- 4-25 8.04 0.251
2020- 4-26 3.75 0.251
2020- 4-26 23.46 0.251
2020- 4-27 19.17 0.251
2020- 4-28 14.88 0.251
2020- 4-29 10.59 0.251
2020- 4-30 6.30 0.251
2020- 5- 1 2.01 0.251
2020- 5- 1 21.72 0.251
2020- 5- 2 17.43 0.251
2020- 5- 3 13.14 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-24 2.35 0.745
2020- 4-24 22.06 0.745
2020- 4-25 17.77 0.745
2020- 4-26 13.48 0.745
2020- 4-27 9.19 0.745
2020- 4-28 4.90 0.745
2020- 4-29 0.61 0.745
2020- 4-29 20.32 0.745
2020- 4-30 16.03 0.745
2020- 5- 1 11.74 0.745
2020- 5- 2 7.45 0.745
2020- 5- 3 3.16 0.745
2020- 5- 3 22.87 0.745

Clear Skies, Petr [2020-04-23 09:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm also planning to do this one, so with Walt's run, we should get a good primary LC.
Don [2020-04-22 01:48, Sugarloaf] Message sent to observers

· Plan to run from SRO tonight.
-Walt [2020-04-22 01:37, Sonoita]

· Like Walt on his Apr 17 attempt, PinPoint could not plate solve because of too few catalog stars in the set magnitude range. I'll switch to a denser catalog for future attempts in this sparse star field.
Don [2020-04-21 20:25, Sugarloaf] Message sent to observers

· Starting a run at 03:25 UT, and should catch the 0.251 phase event.
Don [2020-04-21 01:19, Sugarloaf]

· Vladimir Benishek has taken more good data from Sopot, captured more events. Current (still somewhat tentative) solution:
http://www.asu.cas.cz/~asteroid/01480_2020a_porb.png
http://www.asu.cas.cz/~asteroid/01480_2020a_p1.png

More data are needed to nail it down. Also, at least one session from a substantially different longitude (America) will be needed to nail down P_1, for which there are two possible values currently. Event ephemeris for the prefered P_orb value (but don't limit your observations just to around these times, as the solution may be wrong):

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-21 5.50 0.251
2020- 4-22 20.90 0.251
2020- 4-24 12.30 0.251
2020- 4-26 3.70 0.251
2020- 4-27 19.10 0.251
2020- 4-29 10.50 0.251
2020- 5- 1 1.90 0.251
2020- 5- 2 17.30 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-20 9.66 0.748
2020- 4-22 1.06 0.748
2020- 4-23 16.46 0.748
2020- 4-25 7.86 0.748
2020- 4-26 23.26 0.748
2020- 4-28 14.66 0.748
2020- 4-30 6.06 0.748
2020- 5- 1 21.46 0.748
2020- 5- 3 12.86 0.748

Clear Skies, Petr [2020-04-20 08:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Sorry, no data from MPO the night of 2020-04-15/16. Had a plate solving issue that kept the target from proceeding. Appears to be an area of large position uncertainties in GSC 1.1 so all catalog stars were being thrown out by plate solving routine. Issue submitted to Bob Denny for help troubleshooting. -Walt [2020-04-17 14:33, Sonoita] Message sent to observers

· Will run from Madrona Peak tonight. -Walt [2020-04-15 23:35, Sonoita]

· Will start this one tonight.
Russ [2020-04-15 03:58, Shed of Science]

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. Solution is still uncertain, more data are needed. He would appreciate a help by others here.

Clear Skies, Petr [2020-04-14 12:15, Ondrejov] Message sent to BinAstPhotSurvey conference

(10111) Fresnel (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 5 nights: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/10111.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-28 12:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on May 21,22,24 and tonight, May 25 UT.
Don [2020-05-25 01:40, Sugarloaf]

(35961) 1999 LH7 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 full and 2 partial nights: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/35961.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-28 09:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a run on this on May 24 and doing again tonight, May 25 UT.
Don [2020-05-25 01:37, Sugarloaf]

· Observed this on May 21+22.
Don [2020-05-22 20:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

(18492) 1996 GS2 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: A good solution (in particular, a period twice as long doesn't appear very likely as there is no significant signal in odd harmonics for it), enough coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/18492.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-25 12:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this new target on Apr 29 UT.
Don [2020-04-29 22:13, Sugarloaf]

(12447) Yatescup (Finished) [Add new note]
· This new target was observed by Bruno Christmann on 4 nights, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/12447.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-25 09:12, Ondrejov] Message sent to BinAstPhotSurvey conference

(9089) 1995 UC7 (Finished) [Add new note]
· This one was observed by Don Pray from Sugarloaf Mountain on 9 nights, supported with 2 nights by Vladimir Benishek from Sopot. The 0.08-mag deep attenuation seen in the 2020-04-19.2 data has not been confirmed with more data. It's a U = 3- solution for the short period (there is no significant signal in odd harmonics for a period twice as long):
http://www.asu.cas.cz/~asteroid/09089.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-25 07:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 02:30, Apr 29 UT.
Don [2020-04-28 23:56, Sugarloaf]

· Don Pray has observed this new target from Sugarloaf Mountain, detected what seems to be a 0.08-mag deep partial event. (I'll post lc decomposition plots here later.) More data are needed to confirm. Observations with errors <= 0.02 mag are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2020-04-27 07:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target on Apr 12 UT.
Don [2020-04-13 00:51, Sugarloaf]

(9896) 1996 BL17 (Finished) - slow rotator [Add new note]
· This slow rotator is closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-25 07:14, Ondrejov]

· I observed this one on Apr 22+23. I plan to run it tonight starting at 02:10 UT.
Don [2020-04-29 00:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4353) Onizaki (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04353.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-05 14:27, Ondrejov] Message sent to BinAstPhotSurvey conference

(9100) Tomohisa (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 4 nights, obtained an U = 2 solution for the low amplitude.
http://www.asu.cas.cz/~asteroid/09100.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-05 13:28, Ondrejov] Message sent to BinAstPhotSurvey conference

(5827) Letunov (Finished) [Add new note]
· Julian Oey observed this new target from Leura on 19 nights in October-December last year, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/05827.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-05 13:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· more data was obtained over a period of 16 more nights from 10/29 to 12/04.
Bimodal light curve of period 152h was found with sign of tumbling. [2020-05-03 05:26, Blue Mountains Obs] Message sent to observers

· observed on 10/27 and 10/28 show that the target is could have >200h period. [2019-10-29 08:46, Blue Mountains Obs]

· Started a new target 10/26
appear to be longish 18h period. [2019-10-27 01:35, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5984) Lysippus (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 4 partial nights: Unique solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05984.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-04 13:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did runs on this on Apr 21,22 and 23. Plan to do it again tonight, Apr 29 UT.
Don [2020-04-29 00:31, Sugarloaf]

(1800) Aguilar (Finished) [Add new note]
· Julian Oey observed this return "prime suspect" from Leura in last October: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01800_b9.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-05-04 10:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 10/26 under good condition
no deviation noted [2019-10-27 07:04, Blue Mountains Obs] Message sent to observers

· started this prime suspect 10/22 and 10/23 [2019-10-24 20:08, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3417) Tamblyn (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03417.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-04-24 08:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target on Apr 12 UT.
Don [2020-04-13 00:53, Sugarloaf]

(8165) Gnadig (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/08165.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-04-22 07:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one on April 12 UT.
Don [2020-04-12 19:35, Sugarloaf]

(3669) Vertinskij (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4749, copied below for your convenience.

Cheers, Petr

(3669) VERTINSKIJ
B. Christmann, Soucieu-en-Jarrest, France; P. Pravec, H. Kucakova,
P. Kusnirak, and K. Hornoch, Ondrejov Observatory; V. Benishek, Belgrade
Astronomical Observatory; D. Augustin, Deep Sky Chile Observatory,
Pichasca, Chile; R. Behrend, Geneva Observatory; R. Montaigut and
A. Leroy, OPERA Observatory, France; and D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A., report that photometric
observations taken with a 0.28-m telescope at Soucieu-en-Jarrest, a
0.65-m telescope at Ondrejov Observatory, a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.14-m refractor at the Deep Sky Chile
Observatory, a 0.20-m telescope at the OPERA Observatory, and a 0.50-m
telescope at the Sugarloaf Mountain Observatory during Mar. 19-Apr. 5
reveal that minor planet (3669) is a binary system with an orbital period
of 20.48 Â± 0.01 hr. The primary shows a period of 2.7353 Â± 0.0001 hr
and has a lightcurve amplitude of 0.15 mag at solar phases 4-12 deg,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events
that are 0.09 to 0.21 magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.29. The mean absolute
magnitude in the Cousins R photometric system is H_R = 12.89 Â± 0.07,
assuming the phase relation slope parameter G = 0.24 Â± 0.11.

2020 April 8 (CBET 4749) Daniel W. E. Green [2020-04-09 07:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for CBET:
http://www.asu.cas.cz/~asteroid/03669_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03669_2020a_p1.png

Further observations in the next apparition would be useful for future modeling. Errors < 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-11 11.93 0.246
2020- 4-12 8.41 0.246
2020- 4-13 4.89 0.246
2020- 4-14 1.37 0.246
2020- 4-14 21.85 0.246
2020- 4-15 18.33 0.246
2020- 4-16 14.81 0.246
2020- 4-17 11.29 0.246
2020- 4-18 7.77 0.246
2020- 4-19 4.25 0.246
2020- 4-20 0.73 0.246
2020- 4-20 21.21 0.246
2020- 4-21 17.69 0.246
2020- 4-22 14.17 0.246
2020- 4-23 10.65 0.246
2020- 4-24 7.13 0.246
2020- 4-25 3.61 0.246
2020- 4-26 0.09 0.246
2020- 4-26 20.57 0.246
2020- 4-27 17.05 0.246
2020- 4-28 13.53 0.246
2020- 4-29 10.01 0.246
2020- 4-30 6.49 0.246
2020- 5- 1 2.97 0.246
2020- 5- 1 23.45 0.246
2020- 5- 2 19.93 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2020- 4-11 1.83 0.754
2020- 4-11 22.31 0.754
2020- 4-12 18.79 0.754
2020- 4-13 15.27 0.754
2020- 4-14 11.75 0.754
2020- 4-15 8.23 0.754
2020- 4-16 4.71 0.754
2020- 4-17 1.19 0.754
2020- 4-17 21.67 0.754
2020- 4-18 18.15 0.754
2020- 4-19 14.63 0.754
2020- 4-20 11.11 0.754
2020- 4-21 7.59 0.754
2020- 4-22 4.07 0.754
2020- 4-23 0.55 0.754
2020- 4-23 21.03 0.754
2020- 4-24 17.51 0.754
2020- 4-25 13.99 0.754
2020- 4-26 10.47 0.754
2020- 4-27 6.95 0.754
2020- 4-28 3.43 0.754
2020- 4-28 23.91 0.754
2020- 4-29 20.39 0.754
2020- 4-30 16.87 0.754
2020- 5- 1 13.35 0.754
2020- 5- 2 9.83 0.754

Clear Skies, Petr [2020-04-06 12:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Additional data obtained for this new binary from several stations have established this one rather well. I will post a lc decomposition here later, but now just a quick info on that further observations with errors <= 0.015 mag (don't bother in less ideal conditions) are still needed to refine the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 3-30 13.19 0.246
2020- 3-31 9.67 0.246
2020- 4- 1 6.15 0.246
2020- 4- 2 2.63 0.246
2020- 4- 2 23.11 0.246
2020- 4- 3 19.59 0.246
2020- 4- 4 16.07 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2020- 3-30 23.58 0.753
2020- 3-31 20.06 0.753
2020- 4- 1 16.54 0.753
2020- 4- 2 13.02 0.753
2020- 4- 3 9.50 0.753
2020- 4- 4 5.98 0.753

Clear Skies, Petr [2020-03-30 11:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 23:20 UT tonight. Peter K. [2020-03-29 00:23, Ondrejov] Message sent to observers

· Starting this one at 03:15 UT.
Don [2020-03-28 01:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run on this one tonight (Mar. 27-28 UT).
Vladimir [2020-03-27 22:12, Sopot AO]

· Hana Kucakova and Kamil Hornoch observed this new binary on the past night 2020-03-27.1, captured a part of event. Solution for P_orb is still not unique, more data (with errors of 0.02 mag or better) are still needed.

Clear Skies, Petr [2020-03-27 10:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Bruno Christmann has taken a third night for this binary candidate, captured what appears to be another event. A (still somewhat tentative, and P_orb is far from unique) lc decomposition:
http://www.asu.cas.cz/~asteroid/03669_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03669_2020a_p1.png

More data (with errors of 0.02 mag or better) are needed to establish it.

Clear Skies, Petr [2020-03-25 10:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Bruno Christmann has observed this new target, found it to be a binary suspect. A very tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/03669_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03669_2020a_p1.png

More data (with errors not greater than 0.02 mag) are needed to confirm and establish it.

Clear Skies, Petr [2020-03-23 14:57, Ondrejov] Message sent to BinAstPhotSurvey conference

(38181) 1999 JG124 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain, found it to be a slowish rotator; it's a U = 3- solution.
http://www.asu.cas.cz/~asteroid/38181.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-04-06 10:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this new target on Mar 18 UT.
Don [2020-03-19 01:38, Sugarloaf]

(1823) Gliese (Finished) [Add new note]
· This return "prime suspect" was observed by Julian Oey from Leura and by Romain Montaigut and Arnaud Leroy from OPERA in its 2nd apparition: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/01823_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-04-06 10:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 13:12h 03/20 UT for about 7 hours [2020-03-21 00:03, Blue Mountains Obs] Message sent to observers

· observed from 14:04 to 18:56 UT 03/19 [2020-03-20 04:40, Blue Mountains Obs]

· start observing this prime suspect from 11:47 to 19:07 UT 03/18 [2020-03-20 03:49, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Joe Pollock did this new target with PROMPT on three nights: Unique period, good coverage, no substantial deviation,
http://www.asu.cas.cz/~asteroid/01823.png
Target done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-09-09 06:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began second night on this new object from the current target list at 0130 UT from Prompt Tololo under good conditions. Hope to follow to 1020 UT. First night (8.5 hours) on it gave a period of 4.5 hours, an amplitude of 0.3 magnitudes and no indication of any obvious deviation. Joe [2014-08-04 03:48, Dark Sky & PROMPT] Message sent to observers

· Began run on this new object from the current target list at 0145 UT from Prompt Tololo under good conditions. Hope to follow to 1020 UT. Joe [2014-08-02 01:53, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(12218) Fleischer (Finished) - return binary [Add new note]
· Our report on this one has appeared on CBET 4741, copied below for your convenience.

Cheers, Petr

(12218) FLEISCHER
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, H. Kucakova, K. Hornoch, and P. Kusnirak, Ondrejov Observatory;
V. Benishek, Belgrade Astronomical Observatory; and W. Cooney, Starry Night
Observatory, Columbus, TX, U.S.A., report that photometric observations
taken with a 0.50-m telescope at the Sugarloaf Mountain Observatory, a
0.65-m telescope at Ondrejov Observatory, a 0.35-m telescope at the Sopot
Observatory in Serbia, and a 0.50-m telescope at the Starry Night
Observatory during Feb. 23-Mar. 23 reveal that minor planet (12218) is a
binary system with an orbital period of 21.815 Â± 0.005 hr. The primary
shows a period of 2.82885 Â± 0.00005 hr and has a lightcurve amplitude
of 0.12 mag at solar phases 3-7 deg, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.08 to 0.16 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.28. The mean absolute magnitude in the Cousins R photometric system is
H_R = 13.24 Â± 0.10, assuming the phase relation slope parameter
G = 0.24 Â± 0.11.

2020 April 2 (CBET 4741) Daniel W. E. Green [2020-04-02 07:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for a CBET. Our data:
http://www.asu.cas.cz/~asteroid/12218_2020a_porb.png
http://www.asu.cas.cz/~asteroid/12218_2020a_p1.png
http://www.asu.cas.cz/~asteroid/12218_2020b_porb.png
http://www.asu.cas.cz/~asteroid/12218_2020b_p1.png

Cheers, Petr [2020-03-30 08:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 00:10 UT and hope to catch the 0.742 phase event. [2020-03-22 00:08, Sugarloaf] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/12218_2020a_porb.png
http://www.asu.cas.cz/~asteroid/12218_2020a_p1.png

One more good session (errors 0.02 mag) for each of the two events would be needed before we publish this one on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 3-13 14.13 0.248
2020- 3-14 11.93 0.248
2020- 3-15 9.73 0.248
2020- 3-16 7.53 0.248
2020- 3-17 5.33 0.248
2020- 3-18 3.13 0.248
2020- 3-19 0.93 0.248
2020- 3-19 22.73 0.248
2020- 3-20 20.53 0.248
2020- 3-21 18.33 0.248
2020- 3-22 16.13 0.248
2020- 3-23 13.93 0.248
2020- 3-24 11.73 0.248
2020- 3-25 9.53 0.248
2020- 3-26 7.33 0.248
2020- 3-27 5.13 0.248
2020- 3-28 2.93 0.248
2020- 3-29 0.73 0.248
2020- 3-29 22.53 0.248
2020- 3-30 20.33 0.248
2020- 3-31 18.13 0.248
2020- 4- 1 15.93 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2020- 3-13 3.09 0.742
2020- 3-14 0.89 0.742
2020- 3-14 22.69 0.742
2020- 3-15 20.49 0.742
2020- 3-16 18.29 0.742
2020- 3-17 16.09 0.742
2020- 3-18 13.89 0.742
2020- 3-19 11.69 0.742
2020- 3-20 9.49 0.742
2020- 3-21 7.29 0.742
2020- 3-22 5.09 0.742
2020- 3-23 2.89 0.742
2020- 3-24 0.69 0.742
2020- 3-24 22.49 0.742
2020- 3-25 20.29 0.742
2020- 3-26 18.09 0.742
2020- 3-27 15.89 0.742
2020- 3-28 13.69 0.742
2020- 3-29 11.49 0.742
2020- 3-30 9.29 0.742
2020- 3-31 7.09 0.742
2020- 4- 1 4.89 0.742

Clear Skies, Petr [2020-03-09 07:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 01:00 UT, and hope to catch most of the 0.753 phase event.
Don [2020-03-01 01:00, Sugarloaf] Message sent to observers

· Vladimir Benishek and Walt Cooney took more data for this one from Sopot and Columbus, respectively. A likely solution:
http://www.asu.cas.cz/~asteroid/12218_2020a_porb.png
http://www.asu.cas.cz/~asteroid/12218_2020a_p1.png

More data (errors < 0.02 mag) are needed. Below is an event ephemeris for the likely solution, but please don't confine your observations just to the event times.

Date/Time UTC (LTc.) Phase
--------------------------
2020- 2-28 23.18 0.250
2020- 2-29 20.98 0.250
2020- 3- 1 18.78 0.250
2020- 3- 2 16.58 0.250
2020- 3- 3 14.38 0.250
2020- 3- 4 12.18 0.250
2020- 3- 5 9.98 0.250
2020- 3- 6 7.78 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2020- 2-28 12.33 0.753
2020- 2-29 10.13 0.753
2020- 3- 1 7.93 0.753
2020- 3- 2 5.73 0.753
2020- 3- 3 3.53 0.753
2020- 3- 4 1.33 0.753
2020- 3- 4 23.13 0.753
2020- 3- 5 20.93 0.753

Clear Skies, Petr [2020-02-28 10:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· I just started a run on this one (Feb. 24 UT).
Vladimir [2020-02-24 19:39, Sopot AO] Message sent to observers

· Don Pray has observed this new target from Sugarloaf Mountain on 2 nights, detected a suspect attenuation at the beginning of the 1st night. A very tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/12218_2020a_porb.png
http://www.asu.cas.cz/~asteroid/12218_2020a_p1.png

I encourage others here to help out Don to confirm it. (His weather forecast is unfavorable for this week.)

Clear Skies, Petr [2020-02-24 14:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one on Feb. 23 UT.
Don [2020-02-23 21:10, Sugarloaf]

(3433) Fehrenbach (Finished) - return binary [Add new note]
· Done for the 2nd apparition. Petr [2020-04-01 09:03, Ondrejov]

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/03433_2020c_porb.png
http://www.asu.cas.cz/~asteroid/03433_2020c_p1.png
http://www.asu.cas.cz/~asteroid/03433_2020b_porb.png
http://www.asu.cas.cz/~asteroid/03433_2020b_p1.png
http://www.asu.cas.cz/~asteroid/03433_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03433_2020a_p1.png

More high-quality (errors 0.01 mag) data would be useful for future modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 3-13 5.78 0.252
2020- 3-14 1.45 0.252
2020- 3-14 21.11 0.252
2020- 3-15 16.78 0.252
2020- 3-16 12.44 0.252
2020- 3-17 8.11 0.252
2020- 3-18 3.77 0.252
2020- 3-18 23.44 0.252
2020- 3-19 19.10 0.252
2020- 3-20 14.77 0.252
2020- 3-21 10.43 0.252
2020- 3-22 6.10 0.252
2020- 3-23 1.76 0.252
2020- 3-23 21.43 0.252
2020- 3-24 17.09 0.252
2020- 3-25 12.76 0.252
2020- 3-26 8.42 0.252
2020- 3-27 4.09 0.252
2020- 3-27 23.75 0.252
2020- 3-28 19.42 0.252
2020- 3-29 15.08 0.252
2020- 3-30 10.75 0.252
2020- 3-31 6.41 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2020- 3-13 15.65 0.754
2020- 3-14 11.31 0.754
2020- 3-15 6.98 0.754
2020- 3-16 2.64 0.754
2020- 3-16 22.31 0.754
2020- 3-17 17.97 0.754
2020- 3-18 13.64 0.754
2020- 3-19 9.30 0.754
2020- 3-20 4.97 0.754
2020- 3-21 0.63 0.754
2020- 3-21 20.30 0.754
2020- 3-22 15.96 0.754
2020- 3-23 11.63 0.754
2020- 3-24 7.29 0.754
2020- 3-25 2.96 0.754
2020- 3-25 22.62 0.754
2020- 3-26 18.29 0.754
2020- 3-27 13.95 0.754
2020- 3-28 9.62 0.754
2020- 3-29 5.28 0.754
2020- 3-30 0.95 0.754
2020- 3-30 20.61 0.754

Clear Skies, Petr [2020-03-09 07:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Looks like I can catch the 0.246 event tonight.

Russ [2020-02-28 02:01, Shed of Science] Message sent to observers

· Starting a run on this one to catch the 0.749 phase event.
Russ [2020-02-27 01:47, Shed of Science]

· Started a run at 01:00 UT to catch the 0.749 phase event.
Don [2020-02-22 02:33, Sugarloaf] Message sent to observers

· Started a run at 00:45 UT to catch the 0.246 phase event.
Don [2020-02-20 00:49, Sugarloaf]

· Started this at 00:55 UT to catch the 0.246 phase event.
Don [2020-02-15 00:52, Sugarloaf] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/03433_2020b_porb.png
http://www.asu.cas.cz/~asteroid/03433_2020b_p1.png
http://www.asu.cas.cz/~asteroid/03433_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03433_2020a_p1.png

More high-quality (errors 0.01 mag) data would be useful for future modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 2-12 17.73 0.246
2020- 2-13 13.39 0.246
2020- 2-14 9.06 0.246
2020- 2-15 4.72 0.246
2020- 2-16 0.39 0.246
2020- 2-16 20.05 0.246
2020- 2-17 15.72 0.246
2020- 2-18 11.38 0.246
2020- 2-19 7.05 0.246
2020- 2-20 2.71 0.246
2020- 2-20 22.38 0.246
2020- 2-21 18.04 0.246
2020- 2-22 13.71 0.246
2020- 2-23 9.37 0.246
2020- 2-24 5.04 0.246
2020- 2-25 0.70 0.246
2020- 2-25 20.37 0.246
2020- 2-26 16.03 0.246
2020- 2-27 11.70 0.246
2020- 2-28 7.36 0.246
2020- 2-29 3.03 0.246
2020- 2-29 22.69 0.246
2020- 3- 1 18.36 0.246
2020- 3- 2 14.02 0.246
2020- 3- 3 9.69 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2020- 2-12 7.94 0.749
2020- 2-13 3.61 0.749
2020- 2-13 23.27 0.749
2020- 2-14 18.94 0.749
2020- 2-15 14.60 0.749
2020- 2-16 10.27 0.749
2020- 2-17 5.93 0.749
2020- 2-18 1.60 0.749
2020- 2-18 21.26 0.749
2020- 2-19 16.93 0.749
2020- 2-20 12.59 0.749
2020- 2-21 8.26 0.749
2020- 2-22 3.92 0.749
2020- 2-22 23.59 0.749
2020- 2-23 19.25 0.749
2020- 2-24 14.92 0.749
2020- 2-25 10.58 0.749
2020- 2-26 6.25 0.749
2020- 2-27 1.91 0.749
2020- 2-27 21.58 0.749
2020- 2-28 17.24 0.749
2020- 2-29 12.91 0.749
2020- 3- 1 8.57 0.749
2020- 3- 2 4.24 0.749
2020- 3- 2 23.90 0.749
2020- 3- 3 19.57 0.749

Clear Skies, Petr [2020-02-06 12:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this tonight, Jan 30 UT and hope to catch the 0.750 phase event.
Don [2020-01-29 23:54, Sugarloaf]

· More data obtained for this one by Marek Husarik from Skalnate Pleso and by Don Pray from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/03433_2020b_porb.png
http://www.asu.cas.cz/~asteroid/03433_2020b_p1.png
http://www.asu.cas.cz/~asteroid/03433_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03433_2020a_p1.png

There is an interesting evolution of the event shapes on nearly a daily basis, which will be useful in future modeling. Thus, further monitoring of the events would be useful. High-quality (errors 0.01 mag) data only will be useful; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 1-26 12.84 0.250
2020- 1-27 8.51 0.250
2020- 1-28 4.17 0.250
2020- 1-28 23.84 0.250
2020- 1-29 19.50 0.250
2020- 1-30 15.17 0.250
2020- 1-31 10.83 0.250
2020- 2- 1 6.50 0.250
2020- 2- 2 2.16 0.250
2020- 2- 2 21.83 0.250
2020- 2- 3 17.49 0.250
2020- 2- 4 13.16 0.250
2020- 2- 5 8.82 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2020- 1-26 22.66 0.750
2020- 1-27 18.33 0.750
2020- 1-28 13.99 0.750
2020- 1-29 9.66 0.750
2020- 1-30 5.32 0.750
2020- 1-31 0.99 0.750
2020- 1-31 20.65 0.750
2020- 2- 1 16.32 0.750
2020- 2- 2 11.98 0.750
2020- 2- 3 7.65 0.750
2020- 2- 4 3.31 0.750
2020- 2- 4 22.98 0.750

Clear Skies, Petr [2020-01-26 09:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 01:00, Jan 23 UT and hope to capture the 0.25 phase event.
Don [2020-01-22 23:22, Sugarloaf]

· Starting this one to fill 0.75 phase.
Marek [2020-01-21 22:36, SkalnatePleso] [Remove]
Message sent to observers

· I started this at 01:10 UT and should catch the 0.750 phase event.
Don [2020-01-21 01:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Try to catch phase 0.25 at 19.19UT.
Marek [2020-01-20 16:25, SkalnatePleso] [Remove]
Message sent to observers

· Marek Husarik and Gabo Cervak from Skalnate Pleso, and Russ Durkee from Shed of Science South took first good data for this return binary in its current 2nd apparition:
http://www.asu.cas.cz/~asteroid/03433_2020a_porb.png
http://www.asu.cas.cz/~asteroid/03433_2020a_p1.png

More high-quality (errors 0.01 mag) data are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2020- 1-20 19.19 0.250
2020- 1-21 14.85 0.250
2020- 1-22 10.52 0.250
2020- 1-23 6.18 0.250
2020- 1-24 1.85 0.250
2020- 1-24 21.51 0.250
2020- 1-25 17.18 0.250
2020- 1-26 12.84 0.250
2020- 1-27 8.51 0.250
2020- 1-28 4.17 0.250
2020- 1-28 23.84 0.250
2020- 1-29 19.50 0.250
2020- 1-30 15.17 0.250
2020- 1-31 10.83 0.250
2020- 2- 1 6.50 0.250
2020- 2- 2 2.16 0.250
2020- 2- 2 21.83 0.250
2020- 2- 3 17.49 0.250
2020- 2- 4 13.16 0.250
2020- 2- 5 8.82 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2020- 1-21 5.01 0.750
2020- 1-22 0.67 0.750
2020- 1-22 20.34 0.750
2020- 1-23 16.00 0.750
2020- 1-24 11.67 0.750
2020- 1-25 7.33 0.750
2020- 1-26 3.00 0.750
2020- 1-26 22.66 0.750
2020- 1-27 18.33 0.750
2020- 1-28 13.99 0.750
2020- 1-29 9.66 0.750
2020- 1-30 5.32 0.750
2020- 1-31 0.99 0.750
2020- 1-31 20.65 0.750
2020- 2- 1 16.32 0.750
2020- 2- 2 11.98 0.750
2020- 2- 3 7.65 0.750
2020- 2- 4 3.31 0.750
2020- 2- 4 22.98 0.750

Clear Skies, Petr [2020-01-20 15:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this tonight.
Russ [2020-01-19 04:33, Shed of Science] Message sent to observers

· I open this return binary. Obtained >4hr run.
Marek [2020-01-07 08:42, SkalnatePleso] [Remove]

· Done for the discovery apparition. [2016-02-15 09:18, Ondrejov]

· Recent observations by Jan Vrastil, Hana Kucakova and Kamil Hornoch from here, by Albino Carbognani, by Amadeo Aznar, and by Don Pray from Sugarloaf Mountain have covered the primary event in this one rather well (though one more high-quality run with errors about 0.01 mag wouldn't harm):
http://www.asu.cas.cz/~asteroid/03433_2015d_porb.png
http://www.asu.cas.cz/~asteroid/03433_2015d_p1.png

Observations of the secondary event (with errors < 0.02 mag) would be particularly useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2- 8 13.11 0.215
2016- 2- 9 8.78 0.215
2016- 2-10 4.44 0.215
2016- 2-11 0.11 0.215
2016- 2-11 19.77 0.215
2016- 2-12 15.44 0.215
2016- 2-13 11.10 0.215

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2- 8 22.93 0.715
2016- 2- 9 18.60 0.715
2016- 2-10 14.26 0.715
2016- 2-11 9.93 0.715
2016- 2-12 5.59 0.715
2016- 2-13 1.26 0.715
2016- 2-13 20.92 0.715

Clear Skies, Petr [2016-02-08 09:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at Feb 5, 23:45 UT and should catch the primary LC at 2.14 UT.
Don [2016-02-06 01:48, Sugarloaf] Message sent to observers

· Additional data by Hana Kucakova and Kamil Hornoch from here (a 2.6-h run) and by Albino Carbognani (a 4.4-h run) taken on 2016-01-29 have nailed down the solution; a decomposition of the recent data:
http://www.asu.cas.cz/~asteroid/03433_2015d_porb.png
http://www.asu.cas.cz/~asteroid/03433_2015d_p1.png

More data (for both events) would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2- 1 23.81 0.216
2016- 2- 2 19.48 0.216
2016- 2- 3 15.14 0.216
2016- 2- 4 10.81 0.216
2016- 2- 5 6.47 0.216
2016- 2- 6 2.14 0.216
2016- 2- 6 21.80 0.216
2016- 2- 7 17.47 0.216
2016- 2- 8 13.13 0.216
2016- 2- 9 8.80 0.216
2016- 2-10 4.46 0.216
2016- 2-11 0.13 0.216
2016- 2-11 19.79 0.216
2016- 2-12 15.46 0.216
2016- 2-13 11.12 0.216

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2- 1 13.97 0.716
2016- 2- 2 9.63 0.716
2016- 2- 3 5.30 0.716
2016- 2- 4 0.96 0.716
2016- 2- 4 20.63 0.716
2016- 2- 5 16.29 0.716
2016- 2- 6 11.96 0.716
2016- 2- 7 7.62 0.716
2016- 2- 8 3.29 0.716
2016- 2- 8 22.95 0.716
2016- 2- 9 18.62 0.716
2016- 2-10 14.28 0.716
2016- 2-11 9.95 0.716
2016- 2-12 5.61 0.716
2016- 2-13 1.28 0.716
2016- 2-13 20.94 0.716

Clear Skies, Petr [2016-02-01 12:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Here the sky is clear, I started a run.

Best,

Albino [2016-01-29 19:47, OAVdA (B04)] Message sent to observers

· Jan Vrastil and Kamil Hornoch observed this binary from here on the past night. It is the first data for this object since Don Pray's observations of 2015-12-04. The primary lightcurve has changed and the Jan&Kamil's observations didn't cover it well; the following decomposition is therefore tentative only:
http://www.asu.cas.cz/~asteroid/03433_2015d_p1.png
http://www.asu.cas.cz/~asteroid/03433_2015d_porb.png

We need to cover the primary lightcurve (outside events) well, to decompose the lightcurve data precisely. As weather forecast here is uncertain, we would appreciate if some of you could help us and cover the 3.9-h primary period. Thanks a lot for your help!

Clear Skies, Petr [2016-01-29 12:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Monitoring of the events would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 1-27 6.67 0.242
2016- 1-28 2.34 0.242
2016- 1-28 22.00 0.242
2016- 1-29 17.67 0.242
2016- 1-30 13.33 0.242
2016- 1-31 9.00 0.242
2016- 2- 1 4.66 0.242
2016- 2- 2 0.33 0.242
2016- 2- 2 19.99 0.242
2016- 2- 3 15.66 0.242
2016- 2- 4 11.32 0.242
2016- 2- 5 6.99 0.242
2016- 2- 6 2.65 0.242
2016- 2- 6 22.32 0.242
2016- 2- 7 17.98 0.242
2016- 2- 8 13.65 0.242
2016- 2- 9 9.31 0.242
2016- 2-10 4.98 0.242
2016- 2-11 0.64 0.242
2016- 2-11 20.31 0.242
2016- 2-12 15.97 0.242
2016- 2-13 11.64 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2016- 1-27 16.50 0.742
2016- 1-28 12.16 0.742
2016- 1-29 7.83 0.742
2016- 1-30 3.49 0.742
2016- 1-30 23.16 0.742
2016- 1-31 18.82 0.742
2016- 2- 1 14.49 0.742
2016- 2- 2 10.15 0.742
2016- 2- 3 5.82 0.742
2016- 2- 4 1.48 0.742
2016- 2- 4 21.15 0.742
2016- 2- 5 16.81 0.742
2016- 2- 6 12.48 0.742
2016- 2- 7 8.14 0.742
2016- 2- 8 3.81 0.742
2016- 2- 8 23.47 0.742
2016- 2- 9 19.14 0.742
2016- 2-10 14.80 0.742
2016- 2-11 10.47 0.742
2016- 2-12 6.13 0.742
2016- 2-13 1.80 0.742
2016- 2-13 21.46 0.742

Clear Skies, Petr [2016-01-19 11:33, Ondrejov]

· Monitoring of the events would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-12-28 18.73 0.242
2015-12-29 14.40 0.242
2015-12-30 10.06 0.242
2015-12-31 5.73 0.242
2016- 1- 1 1.39 0.242
2016- 1- 1 21.06 0.242
2016- 1- 2 16.72 0.242
2016- 1- 3 12.39 0.242
2016- 1- 4 8.05 0.242
2016- 1- 5 3.72 0.242
2016- 1- 5 23.38 0.242
2016- 1- 6 19.05 0.242
2016- 1- 7 14.71 0.242
2016- 1- 8 10.38 0.242
2016- 1- 9 6.04 0.242
2016- 1-10 1.71 0.242
2016- 1-10 21.37 0.242
2016- 1-11 17.04 0.242
2016- 1-12 12.70 0.242
2016- 1-13 8.37 0.242
2016- 1-14 4.03 0.242
2016- 1-14 23.70 0.242
2016- 1-15 19.36 0.242
2016- 1-16 15.03 0.242
2016- 1-17 10.69 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2015-12-29 4.56 0.742
2015-12-30 0.22 0.742
2015-12-30 19.89 0.742
2015-12-31 15.55 0.742
2016- 1- 1 11.22 0.742
2016- 1- 2 6.88 0.742
2016- 1- 3 2.55 0.742
2016- 1- 3 22.21 0.742
2016- 1- 4 17.88 0.742
2016- 1- 5 13.54 0.742
2016- 1- 6 9.21 0.742
2016- 1- 7 4.87 0.742
2016- 1- 8 0.54 0.742
2016- 1- 8 20.20 0.742
2016- 1- 9 15.87 0.742
2016- 1-10 11.53 0.742
2016- 1-11 7.20 0.742
2016- 1-12 2.86 0.742
2016- 1-12 22.53 0.742
2016- 1-13 18.19 0.742
2016- 1-14 13.86 0.742
2016- 1-15 9.52 0.742
2016- 1-16 5.19 0.742
2016- 1-17 0.85 0.742

Clear Skies, Petr [2015-12-17 07:39, Ondrejov]

· Our binary asteroid discovery report for this one has appeared on CBET 4201, copied below for your convenience.

Cheers, Petr

(3433) FEHRENBACH
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; A. Marchini, F. Salvaggio, and R. Papini,
Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of
Siena; J. Pollock, D. Caton, and R. Hawkins, Appalachian State University
(ASU); V. Benishek, Belgrade Astronomical Observatory; A. Smith, Gemini
North; and D. Reichart and J. Haislip, University of North Carolina at
Chapel Hill, report that photometric observations taken with a 0.50-m
telescope (+ SBIG ST-10XME camera) at the Sugarloaf Mountain Observatory,
a 0.30-m telescope (+ SBIG STL-6303 camera) at the Astronomical Observatory
of the University of Siena, a 0.35-m telescope (+ Apogee Alta U47+ camera)
at the ASU's Dark Sky Observatory near Boone, NC, USA, and a 0.35-m telescope
(+ SBIG ST-8 camera)at the Sopot Observatory in Serbia during Oct. 31-Nov. 21
reveal that minor planet (3433) is a binary system with an orbital period of
19.665 Â± 0.005 hr. The primary shows a period of 3.9160 Â± 0.0003 hr and
has a lightcurve amplitude of 0.27 mag at solar phases 6-11 degrees. Mutual
eclipse/occultation events that are 0.10- to 0.17-magnitude deep indicate the
secondary-to-primary mean-diameter ratio of 0.31. The secondary is
synchronous, and it has an amplitude of 0.03 mag in the observed lightcurve,
suggesting a secondary elongation of about 1.3 after removing contribution of
light from the primary. The system's total V magnitude ranged between 14.2
and 15.0 over the observing run.

2015 November 24 (CBET 4201) Daniel W. E. Green [2015-11-24 16:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· A decomposition of our current dataset:
http://www.asu.cas.cz/~asteroid/03433_2015b_porb.png
http://www.asu.cas.cz/~asteroid/03433_2015b_p1.png
http://www.asu.cas.cz/~asteroid/03433_2015a_porb.png
http://www.asu.cas.cz/~asteroid/03433_2015a_p1.png

We have a discovery announcement submitted to CBET. Monitoring of the events would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-11-29 6.75 0.241
2015-11-30 2.42 0.241
2015-11-30 22.08 0.241
2015-12- 1 17.75 0.241
2015-12- 2 13.41 0.241
2015-12- 3 9.08 0.241
2015-12- 4 4.74 0.241
2015-12- 5 0.41 0.241
2015-12- 5 20.07 0.241
2015-12- 6 15.74 0.241
2015-12- 7 11.40 0.241
2015-12- 8 7.07 0.241
2015-12- 9 2.73 0.241
2015-12- 9 22.40 0.241
2015-12-10 18.06 0.241
2015-12-11 13.73 0.241
2015-12-12 9.39 0.241
2015-12-13 5.06 0.241
2015-12-14 0.72 0.241
2015-12-14 20.39 0.241
2015-12-15 16.05 0.241
2015-12-16 11.72 0.241
2015-12-17 7.38 0.241
2015-12-18 3.05 0.241
2015-12-18 22.71 0.241
2015-12-19 18.38 0.241
2015-12-20 14.04 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2015-11-29 16.73 0.748
2015-11-30 12.40 0.748
2015-12- 1 8.06 0.748
2015-12- 2 3.73 0.748
2015-12- 2 23.39 0.748
2015-12- 3 19.06 0.748
2015-12- 4 14.72 0.748
2015-12- 5 10.39 0.748
2015-12- 6 6.05 0.748
2015-12- 7 1.72 0.748
2015-12- 7 21.38 0.748
2015-12- 8 17.05 0.748
2015-12- 9 12.71 0.748
2015-12-10 8.38 0.748
2015-12-11 4.04 0.748
2015-12-11 23.71 0.748
2015-12-12 19.37 0.748
2015-12-13 15.04 0.748
2015-12-14 10.70 0.748
2015-12-15 6.37 0.748
2015-12-16 2.03 0.748
2015-12-16 21.70 0.748
2015-12-17 17.36 0.748
2015-12-18 13.03 0.748
2015-12-19 8.69 0.748
2015-12-20 4.36 0.748

Clear Skies, Petr [2015-11-23 08:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night (Nov. 18-19, 18:05-04:11 UT) from Sopot.
Vladimir [2015-11-19 13:37, Sopot AO] Message sent to observers

· I started this at 00:40 UT.
Don [2015-11-18 01:54, Sugarloaf]

· Started this at 02:45 UT.
Don [2015-11-16 03:35, Sugarloaf]

· I started a run on this at 01:40 UT.
Don [2015-11-10 01:57, Sugarloaf] Message sent to observers

· Started this one at 01:30 UT.
Don [2015-11-09 02:39, Sugarloaf]

· Don Pray has taken two more nights for this new binary from Sugarloaf Mountain, captured two more events. The orbital period is likely 19.7 h, but it needs to be nailed down with more data.
http://www.asu.cas.cz/~asteroid/03433_porb.png
http://www.asu.cas.cz/~asteroid/03433_p1.png

Don hasn't got a good weather now and the weather forecast for his station is not good for following nights as well, so I encourage others here to help him out. Below is a tentative event ephemeris, but please take data also well outside the predicted events.

Date/Time UTC (LTc.) Phase
--------------------------
2015-11- 6 8.48 0.260
2015-11- 7 4.16 0.260
2015-11- 7 23.84 0.260
2015-11- 8 19.52 0.260
2015-11- 9 15.20 0.260
2015-11-10 10.88 0.260
2015-11-11 6.56 0.260
2015-11-12 2.24 0.260
2015-11-12 21.92 0.260
2015-11-13 17.60 0.260
2015-11-14 13.28 0.260
2015-11-15 8.96 0.260
2015-11-16 4.64 0.260
2015-11-17 0.32 0.260
2015-11-17 20.00 0.260
2015-11-18 15.68 0.260
2015-11-19 11.36 0.260
2015-11-20 7.04 0.260
2015-11-21 2.72 0.260
2015-11-21 22.40 0.260
2015-11-22 18.08 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2015-11- 6 18.33 0.760
2015-11- 7 14.01 0.760
2015-11- 8 9.69 0.760
2015-11- 9 5.37 0.760
2015-11-10 1.05 0.760
2015-11-10 20.73 0.760
2015-11-11 16.41 0.760
2015-11-12 12.09 0.760
2015-11-13 7.77 0.760
2015-11-14 3.45 0.760
2015-11-14 23.13 0.760
2015-11-15 18.81 0.760
2015-11-16 14.49 0.760
2015-11-17 10.17 0.760
2015-11-18 5.85 0.760
2015-11-19 1.53 0.760
2015-11-19 21.21 0.760
2015-11-20 16.89 0.760
2015-11-21 12.57 0.760
2015-11-22 8.25 0.760

Clear Skies, Petr [2015-11-06 07:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start a run at 01:40 UT.
Don [2015-11-05 01:23, Sugarloaf]

· I'll be starting a run on this one at 01:40, Nov 4 UT.
Don [2015-11-03 23:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray has taken two nights for this new target from Sugarloaf Mountain, found it to be a binary suspect. A decomposition (somewhat tentative for now, and P_orb was actually not determined):
http://www.asu.cas.cz/~asteroid/03433_porb.png
http://www.asu.cas.cz/~asteroid/03433_p1.png

More data are needed to confirm the events and to establish their period. I encourage people here to help out Don.

Clear Skies, Petr [2015-11-03 15:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start a run at 01:45 UT.
Don [2015-11-03 00:42, Sugarloaf]

· I started this one last night.
Don [2015-10-31 15:49, Sugarloaf] Message sent to BinAstPhotSurvey conference

(7132) Casulli (Finished) - binary [Add new note]
· Yesterday, just several hours after I posted here the message on that Vladimir Benishek found (7132) to be a binary suspect, there appeared a report by Franco et al. on Astronomer's Telegram 13590 on their discovery of the binary nature of the asteroid:
http://www.astronomerstelegram.org/?read=13590
It is obvious from the dates of their observations (2020 February 20 to March 20) that they obtained their solution independently to what we posted here yesterday. So, they are obviously the discoverers of this binary. However, the timing of their telegram suggests that someone from this group informed them about Vladimir's finding. I remind you all that this group is closed and any information posted here must be regarded as confidential and must not be forwarded outside this group unless you obtain an explicit permission of people involved in given observations and analyses. While no "harm" did happen in this particular case, it could be different in future cases. Therefore I ask you all to comply with the ethical rules and don't post any information from this closed group to outside without permission. Thank you!

Kind regards,

Petr Pravec [2020-03-26 07:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek observed this off-list target on 3 nights, found it to be a binary suspect. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/07132_2020a_porb.png
http://www.asu.cas.cz/~asteroid/07132_2020a_p1.png

More data (errors < 0.02 mag; don't bother in poorer conditions) are needed to establish it. Weather forecast for Vladimir's site is poor for these days and he would appreciate a help by others.

Clear Skies, Petr [2020-03-25 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

(3363) Bowen (Finished) [Add new note]
· Bruno Christmann observed this returned "prime suspect" in its current 2nd apparition: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/03363_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Bruno!

Petr [2020-03-20 10:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Unsuccessfull attempt (too high noise from the bright moon sky). Petr [2016-06-07 12:14, Ondrejov]

· starting a new target for full moon project [2016-05-19 02:22, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Joe Pollock has done this new target with Prompt on three nights: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/03363.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good, fast work Joe.

Cheers, Petr [2015-01-19 06:49, Ondrejov] Message sent to BinAstPhotSurvey conference

(17509) Ikumadan (Finished) [Add new note]
· Bruno Christmann observed this one on 4 nights: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/17509_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-03-18 12:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been well done by Don Pray on three and half nights. Unique period, double coverage, no significant deviation seen. Finished for the Survey. A note on it put on
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, Don!

Cheers, Petr [2006-04-24 08:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this tonight.

Don [2006-04-22 00:45, CarbuncleHill]

· Will be starting at 12:40, Apr 20 UT, as the main target for the night.

Don [2006-04-19 23:14, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this one tonight under more favorable conditions than last night.

Don [2006-04-17 02:29, CarbuncleHill]

· Taking a first look at this tonight, Apr 16 UT.

Don [2006-04-16 02:27, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(8149) Ruff (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/08149.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-03-17 07:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on Feb 22, 23 and tonight, Feb 29 UT.
Don [2020-02-29 01:44, Sugarloaf]

(5037) Habing (Finished) - new binary [Add new note]
· Our report on this one has appeared on CBET 4730, copied below for your convenience.

Cheers, Petr

(5037) HABING
P. Pravec, Ondrejov Observatory; D. Oszkiewicz and V. Troianskyi, Adam
Mickiewicz University, Poznan, Poland; B. A. Skiff, Lowell Observatory; V.
Benishek, Belgrade Astronomical Observatory; A. Aznar Macias, Isaac Aznar
Observatory, Alcublas, Valencia, Spain; D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A.; and B. D. Warner, Center for Solar
System Studies, Rancho Cucamonga, CA, U.S.A., report that photometric
observations taken with 0.7-m and 1.1-m telescopes at Lowell Observatory
during Feb. 15-Mar. 4 reveal that minor planet (5037) is a binary system with
an orbital period of 21.74 Â± 0.03 hr. The primary shows a period of 2.8291
Â± 0.0002 hr and has a lightcurve amplitude of 0.25 magnitude at solar
phases 4-7 degrees. Mutual eclipse/occultation events that are 0.05 to 0.11
magnitude deep indicate a lower limit on the secondary-to-primary mean-
diameter ratio of 0.22. These results were confirmed with independent
observations taken with a 0.35-m telescope at the Sopot Observatory in
Serbia, a 0.35-m telescope at the Isaac Aznar Observatory, and a 0.50-m
telescope at the Sugarloaf Mountain Observatory during Feb. 21-29.

2020 March 16 (CBET 4730) Daniel W. E. Green [2020-03-16 07:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:05 UT. Forecast clouds are clear skies instead. [2020-03-05 00:02, Sugarloaf] Message sent to observers

· I started a run on this at 00:55 UT.
Don [2020-02-29 01:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Working this one tonight.
Vladimir [2020-02-24 19:42, Sopot AO]

· Vladimir Benishek has observed this off-list target from Sopot, found that there might be an event. A very tentative decomposition (may be entirely wrong):
http://www.asu.cas.cz/~asteroid/05037_2020a_porb.png
http://www.asu.cas.cz/~asteroid/05037_2020a_p1.png

Vladimir would appreciate a help by others here.

Clear Skies, Petr [2020-02-23 16:15, Ondrejov] Message sent to BinAstPhotSurvey conference

(13195) 1997 CG6 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/13195.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2020-03-08 15:34, Ondrejov] Message sent to BinAstPhotSurvey conference

(16986) Archivestef (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/16986.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-03-03 07:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this new target on Feb 29 UT.
Don [2020-02-29 21:09, Sugarloaf]

(7368) Haldancohn (Finished) [Add new note]
· Vladimir Benishek observed this returned "prime suspect" from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07368_c0.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-03-01 13:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this returning "prime suspect" on 2 nights (Feb. 13 and Feb. 15-16 UT).
Vladimir [2020-02-16 14:06, Sopot AO]

· This new target was observed by Julian Oey from Leura and Roger Groom from Perth: An U = 3- solution, multiple coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07368.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-06-04 14:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 05/28 and 05/29 from DRO(Groom) [2017-05-30 12:16, Blue Mountains Obs] Message sent to observers

· start a new target 04/27, 04/28, 04/29, 04/30 [2017-05-06 11:34, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5961) Watt (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05961.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-02-25 14:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this last night, Feb 21 UT.
Don [2020-02-21 21:03, Sugarloaf] Message sent to observers

· I started this on Feb 15. One session so far.
Don [2020-02-17 14:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5377) Komori (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 4 nights: Unique solution, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05377.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-02-25 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this on Feb 21.
Don [2020-02-21 21:05, Sugarloaf]

(18172) 2000 QL7 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good period solution and coverage, no significant deviation (greater than a few 0.01 mag).
http://www.asu.cas.cz/~asteroid/18172_2020a.png
http://www.asu.cas.cz/~asteroid/18172_2020b.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-02-17 08:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Worked this one last night (Feb. 15-16 UT).
Vladimir [2020-02-16 14:00, Sopot AO]

· I observed this new target on 3 nights (Jan. 24-25, Jan. 25-26 and Feb. 01-02 UT).
Vladimir [2020-02-02 13:34, Sopot AO] Message sent to BinAstPhotSurvey conference

(13398) 1999 RF62 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/13398.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-01-31 15:16, Ondrejov] Message sent to BinAstPhotSurvey conference

(4857) Altgamia (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution, no significant deviation.
http://www.asu.cas.cz/~asteroid/04857.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-01-26 14:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing again this one tonight.
Vladimir [2020-01-05 22:10, Sopot AO] Message sent to observers

· I observed this new target on January 02-03 and 03-04 UT.
Vladimir [2020-01-04 16:40, Sopot AO] Message sent to BinAstPhotSurvey conference

(87135) 2000 NU5 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 7 nights. The best fit solution is a hexamodal lightcurve with P = 16.029 h,
http://www.asu.cas.cz/~asteroid/87135.png
Periods 8.014 and 12.022 h fit nearly equally well, but they seem less plausible.
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-01-23 14:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night and plan to again, Dec 24 UT.
Don [2019-12-24 01:49, Sugarloaf]

· I did a run on this last night and will again tonight.
Don [2019-12-21 01:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3193) Elliot (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03193_2019a.png
http://www.asu.cas.cz/~asteroid/03193_2019b.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2020-01-23 14:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this last night and again tonight (Dec 24 UT).
Don [2019-12-24 01:48, Sugarloaf]

· I've taken 2 runs on this one in the last few days, and am observing it again tonight, Dec 21 UT.
Don [2019-12-21 01:22, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2825) Crosby (Finished) - return binary [Add new note]
· Target finished for the 2nd apparition. [2020-01-07 12:10, Ondrejov]

· Don Pray has observed this return binary in its current 2nd apparition from Sugarloaf Mountain on 5 nights:
http://www.asu.cas.cz/~asteroid/02825_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02825_2019a_p1.png

More data in the upcoming lunation would be useful for future modeling. Errors < 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019-12-15 10.20 0.247
2019-12-16 0.55 0.247
2019-12-16 14.90 0.247
2019-12-17 5.25 0.247
2019-12-17 19.60 0.247
2019-12-18 9.95 0.247
2019-12-19 0.30 0.247
2019-12-19 14.65 0.247
2019-12-20 5.00 0.247
2019-12-20 19.35 0.247
2019-12-21 9.70 0.247
2019-12-22 0.05 0.247
2019-12-22 14.40 0.247
2019-12-23 4.75 0.247
2019-12-23 19.10 0.247
2019-12-24 9.45 0.247
2019-12-24 23.80 0.247
2019-12-25 14.15 0.247
2019-12-26 4.50 0.247
2019-12-26 18.85 0.247
2019-12-27 9.20 0.247
2019-12-27 23.55 0.247
2019-12-28 13.90 0.247
2019-12-29 4.25 0.247
2019-12-29 18.60 0.247
2019-12-30 8.95 0.247
2019-12-30 23.30 0.247
2019-12-31 13.65 0.247
2020- 1- 1 4.00 0.247
2020- 1- 1 18.35 0.247
2020- 1- 2 8.70 0.247
2020- 1- 2 23.05 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2019-12-15 3.02 0.747
2019-12-15 17.37 0.747
2019-12-16 7.72 0.747
2019-12-16 22.07 0.747
2019-12-17 12.42 0.747
2019-12-18 2.77 0.747
2019-12-18 17.12 0.747
2019-12-19 7.47 0.747
2019-12-19 21.82 0.747
2019-12-20 12.17 0.747
2019-12-21 2.52 0.747
2019-12-21 16.87 0.747
2019-12-22 7.22 0.747
2019-12-22 21.57 0.747
2019-12-23 11.92 0.747
2019-12-24 2.27 0.747
2019-12-24 16.62 0.747
2019-12-25 6.97 0.747
2019-12-25 21.32 0.747
2019-12-26 11.67 0.747
2019-12-27 2.02 0.747
2019-12-27 16.37 0.747
2019-12-28 6.72 0.747
2019-12-28 21.07 0.747
2019-12-29 11.42 0.747
2019-12-30 1.77 0.747
2019-12-30 16.12 0.747
2019-12-31 6.47 0.747
2019-12-31 20.82 0.747
2020- 1- 1 11.17 0.747
2020- 1- 2 1.52 0.747
2020- 1- 2 15.87 0.747

Clear Skies, Petr [2019-12-10 08:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:50 UT to capture the secondary event.
Don [2019-11-09 01:55, Sugarloaf] Message sent to observers

· Observed this on Nov 7 and on a few prior dates.
Don [2019-11-07 21:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for the discovery apparition. [2017-04-11 12:54, Ondrejov]

· Our announcement on this one has appeared on CBET 4371, copied here for your convenience. Below I also put an event ephemeris; further observations with errors < 0.03 mag ---don't bother in suboptimal conditions--- would be useful for future modeling.

(2825) CROSBY
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, J. Vrastil, and K. Hornoch, Ondrejov Observatory; V. Benishek,
Belgrade Astronomical Observatory; W. Cooney, Starry Night Observatory,
Columbus, TX, U.S.A.; B. Flanagan and B. Pellerin, Madrona Peak Observatory,
Medina, TX, U.S.A.; R. Montaigut and A. Leroy, OPERA Observatory, France; and
A. Marchini, R. Papini, and F. Salvaggio, Dipartimento di Scienze Fisiche,
Della Terra e Dell'Ambiente, University of Siena, report that photometric
observations taken with a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.65-m telescope at the Ondrejov Observatory, a 0.35-m
telescope at the Sopot Observatory in Serbia, a 0.43-m telescope at the
Starry Night Observatory, a 0.6-m telescope at the Madrona Peak Observatory,
a 0.20-m telescope at the OPERA Observatory, and a 0.30-m telescope at the
Astronomical Observatory of the University of Siena during Feb. 17-27 reveal
that minor planet (2825) is a binary system with an orbital period of 14.350
Â± 0.005 hr. The primary shows a period of 2.8135 Â± 0.0002 hr and has a
lightcurve amplitude of 0.08 mag at solar phases 7-12 degrees, suggesting a
nearly spheroidal shape. Mutual eclipse/occultation events that are 0.04-
to 0.08-magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.18.

2017 March 9 (CBET 4371) Daniel W. E. Green

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-15 12.66 0.245
2017- 3-16 3.01 0.245
2017- 3-16 17.36 0.245
2017- 3-17 7.71 0.245
2017- 3-17 22.06 0.245
2017- 3-18 12.41 0.245
2017- 3-19 2.76 0.245
2017- 3-19 17.11 0.245
2017- 3-20 7.46 0.245
2017- 3-20 21.81 0.245
2017- 3-21 12.16 0.245
2017- 3-22 2.51 0.245
2017- 3-22 16.86 0.245
2017- 3-23 7.21 0.245
2017- 3-23 21.56 0.245
2017- 3-24 11.91 0.245
2017- 3-25 2.26 0.245
2017- 3-25 16.61 0.245
2017- 3-26 6.96 0.245
2017- 3-26 21.31 0.245
2017- 3-27 11.66 0.245
2017- 3-28 2.01 0.245
2017- 3-28 16.36 0.245
2017- 3-29 6.71 0.245
2017- 3-29 21.06 0.245
2017- 3-30 11.41 0.245
2017- 3-31 1.76 0.245
2017- 3-31 16.11 0.245
2017- 4- 1 6.46 0.245
2017- 4- 1 20.81 0.245
2017- 4- 2 11.16 0.245
2017- 4- 3 1.51 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-15 19.83 0.745
2017- 3-16 10.18 0.745
2017- 3-17 0.53 0.745
2017- 3-17 14.88 0.745
2017- 3-18 5.23 0.745
2017- 3-18 19.58 0.745
2017- 3-19 9.93 0.745
2017- 3-20 0.28 0.745
2017- 3-20 14.63 0.745
2017- 3-21 4.98 0.745
2017- 3-21 19.33 0.745
2017- 3-22 9.68 0.745
2017- 3-23 0.03 0.745
2017- 3-23 14.38 0.745
2017- 3-24 4.73 0.745
2017- 3-24 19.08 0.745
2017- 3-25 9.43 0.745
2017- 3-25 23.78 0.745
2017- 3-26 14.13 0.745
2017- 3-27 4.48 0.745
2017- 3-27 18.83 0.745
2017- 3-28 9.18 0.745
2017- 3-28 23.53 0.745
2017- 3-29 13.88 0.745
2017- 3-30 4.23 0.745
2017- 3-30 18.58 0.745
2017- 3-31 8.93 0.745
2017- 3-31 23.28 0.745
2017- 4- 1 13.63 0.745
2017- 4- 2 3.98 0.745
2017- 4- 2 18.33 0.745
2017- 4- 3 8.68 0.745

Cheers, Petr [2017-03-09 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Extensive observations from several stations have led to a unique solution for this new binary:
http://www.asu.cas.cz/~asteroid/02825_porb.png
http://www.asu.cas.cz/~asteroid/02825_p1.png

We are going to do a CBET announcement. More data are not urgently needed now (but they will be really useful in the next lunation). Anyway, for a case you wished to take them anyway, below is an event ephemeris. However, do it in the best conditions only; errors < 0.02 mag are needed.

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2-27 23.56 0.245
2017- 2-28 13.91 0.245
2017- 3- 1 4.26 0.245
2017- 3- 1 18.61 0.245
2017- 3- 2 8.96 0.245
2017- 3- 2 23.31 0.245
2017- 3- 3 13.66 0.245
2017- 3- 4 4.01 0.245
2017- 3- 4 18.36 0.245
2017- 3- 5 8.71 0.245
2017- 3- 5 23.06 0.245
2017- 3- 6 13.41 0.245
2017- 3- 7 3.76 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2-27 16.38 0.745
2017- 2-28 6.73 0.745
2017- 2-28 21.08 0.745
2017- 3- 1 11.43 0.745
2017- 3- 2 1.78 0.745
2017- 3- 2 16.13 0.745
2017- 3- 3 6.48 0.745
2017- 3- 3 20.83 0.745
2017- 3- 4 11.18 0.745
2017- 3- 5 1.53 0.745
2017- 3- 5 15.88 0.745
2017- 3- 6 6.23 0.745
2017- 3- 6 20.58 0.745

Clear Skies, Petr [2017-02-27 12:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one at 00:45 UT.
Don [2017-02-27 01:07, Sugarloaf] Message sent to observers

· Observed on Feb. 25, 17:26-20:35 UT.
Vladimir [2017-02-26 16:06, Sopot AO]

· Just started 2825 Crosby at 0040 UT. 2411 Zellner (Mag 15.9) is also in field. Unknown period with H = 12.75. Slowly converging with 2825 so both will be in same field for next 10 days. Joe [2017-02-26 00:51, Dark Sky & PROMPT] Message sent to observers

· Started a run on this target at 21:15 UT
Romain [2017-02-24 21:36, OPERA]

· Observed on Feb. 23, 17:27-23:37 UT.
Vladimir [2017-02-24 14:14, Sopot AO]

· Observed on Feb. 22-23, 18:01-00:42 UT.
Vladimir [2017-02-23 13:08, Sopot AO] Message sent to observers

· I started this at 23:55, Feb 20 UT.
Don [2017-02-20 23:56, Sugarloaf]

· Started a run at 18.00 UT, but we have bad weather forecast in few hours. [2017-02-20 18:58, Univ-Siena IT] Message sent to observers

· Started this at 00:00 UT.
Don [2017-02-20 00:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Start a run on this at 18.30 UT.
Alessandro [2017-02-19 20:25, Univ-Siena IT] Message sent to observers

· Don Pray took first three nights for this new target from Sugarloaf Mountain, found it to be a binary suspect. A tentative decomposition:
http://www.asu.cas.cz/~asteroid/02825_porb.png
http://www.asu.cas.cz/~asteroid/02825_p1.png

More data (errors < 0.03 mag) are needed to nail down it. I encourage others here to help out Don.

Clear Skies, Petr [2017-02-19 16:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:45 UT.
Don [2017-02-19 02:09, Sugarloaf]

· I observed this on Feb 17 and 18.
Don [2017-02-18 15:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2516) Roman (Finished) - return binary [Add new note]
· Our report on this one has appeared on CBET 4704, copied below for your convenience.

Cheers, Petr

(2516) ROMAN
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A.; M. Husarik, M. Pikler, and G. Cervak, Skalnate Pleso Observatory; F.
Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; V. Chiorny and O.
Mikhalchenko, Kharkiv Observatory; and J. Oey, Blue Mountains Observatory,
Leura, NSW, Australia, report that photometric observations taken with a
0.35-m telescope at the Sopot Observatory in Serbia, a 0.50-m telescope at
the Shed of Science South Observatory, a 0.61-m telescope at the Skalnate
Pleso Observatory, a 0.35-m telescope at the Organ Mesa Observatory, a 0.70-m
telescope at the Chuguev station of the Kharkiv Observatory in Ukraine, and a
0.35-m telescope at the Blue Mountains Observatory during Oct. 22-Dec. 6
reveal that minor planet (2516) is a binary system with an orbital period of
16.220 Â± 0.004 hr. The primary shows a period of 2.6266 Â± 0.0004 hr and
has a lightcurve amplitude of 0.07 magnitude at solar phases 2-17 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.06 to 0.11 magnitude deep indicate a secondary-to-primary mean-diameter
ratio of 0.23 Â± 0.02.

2019 December 13 (CBET 4704) Daniel W. E. Green [2019-12-13 10:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new binary is ready for a CBET announcement. Our data so far:
http://www.asu.cas.cz/~asteroid/02516_2019b_porb.png
http://www.asu.cas.cz/~asteroid/02516_2019b_p1.png
http://www.asu.cas.cz/~asteroid/02516_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02516_2019a_p1.png

Follow-up observations in the next lunation would be useful for future modeling. Errors < 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019-12-15 10.36 0.246
2019-12-16 2.58 0.246
2019-12-16 18.80 0.246
2019-12-17 11.02 0.246
2019-12-18 3.24 0.246
2019-12-18 19.46 0.246
2019-12-19 11.68 0.246
2019-12-20 3.90 0.246
2019-12-20 20.12 0.246
2019-12-21 12.34 0.246
2019-12-22 4.56 0.246
2019-12-22 20.78 0.246
2019-12-23 13.00 0.246
2019-12-24 5.22 0.246
2019-12-24 21.44 0.246
2019-12-25 13.66 0.246
2019-12-26 5.88 0.246
2019-12-26 22.10 0.246
2019-12-27 14.32 0.246
2019-12-28 6.54 0.246
2019-12-28 22.76 0.246
2019-12-29 14.98 0.246
2019-12-30 7.20 0.246
2019-12-30 23.42 0.246
2019-12-31 15.64 0.246
2020- 1- 1 7.86 0.246
2020- 1- 2 0.08 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2019-12-15 2.24 0.746
2019-12-15 18.46 0.746
2019-12-16 10.68 0.746
2019-12-17 2.90 0.746
2019-12-17 19.12 0.746
2019-12-18 11.34 0.746
2019-12-19 3.56 0.746
2019-12-19 19.78 0.746
2019-12-20 12.00 0.746
2019-12-21 4.22 0.746
2019-12-21 20.44 0.746
2019-12-22 12.66 0.746
2019-12-23 4.88 0.746
2019-12-23 21.10 0.746
2019-12-24 13.32 0.746
2019-12-25 5.54 0.746
2019-12-25 21.76 0.746
2019-12-26 13.98 0.746
2019-12-27 6.20 0.746
2019-12-27 22.42 0.746
2019-12-28 14.64 0.746
2019-12-29 6.86 0.746
2019-12-29 23.08 0.746
2019-12-30 15.30 0.746
2019-12-31 7.52 0.746
2019-12-31 23.74 0.746
2020- 1- 1 15.96 0.746

Clear Skies, Petr [2019-12-10 08:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run on 12/6 at 4UT

Russ [2019-12-06 04:04, Shed of Science] Message sent to observers

· Started run on 12/4 at 2 UT

Russ [2019-12-04 02:11, Shed of Science]

· Started run on 12/3 at 1:30UT
Russ [2019-12-03 02:34, Shed of Science]

· Just started a run 12/01 2 UT for the next 6 hours.
Russ [2019-12-01 02:17, Shed of Science] Message sent to observers

· observed on 11/26,11/27,11/28,11/29 [2019-11-30 11:31, Blue Mountains Obs]

· Just started for the evening 11/25 3:00 UT

Russ [2019-11-25 03:29, Shed of Science] Message sent to observers

· Just started under good conditions. 11/19 1:30 UT

Russ [2019-11-19 01:23, Shed of Science]

· Starting a run on this one 11/18 03:00
Russ [2019-11-18 03:01, Shed of Science] Message sent to observers

· Worked this one on 11/18. Sent data off to Petr.

Russ [2019-11-17 22:18, Shed of Science]

· Our current data for this new binary:
http://www.asu.cas.cz/~asteroid/02516_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02516_2019a_p1.png

Before we publish it on CBET, we need to take more data both in and outside events. There are apparent certain deviations in some sessions that might be due to a third lightcurve component, but it needs to be confirmed. Only high quality data (errors < 0.015 mag) and long sessions will be useful; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019-11-15 16.66 0.245
2019-11-16 8.88 0.245
2019-11-17 1.10 0.245
2019-11-17 17.32 0.245
2019-11-18 9.54 0.245
2019-11-19 1.76 0.245
2019-11-19 17.98 0.245
2019-11-20 10.20 0.245
2019-11-21 2.42 0.245
2019-11-21 18.64 0.245
2019-11-22 10.86 0.245
2019-11-23 3.08 0.245
2019-11-23 19.30 0.245
2019-11-24 11.52 0.245
2019-11-25 3.74 0.245
2019-11-25 19.96 0.245
2019-11-26 12.18 0.245
2019-11-27 4.40 0.245
2019-11-27 20.62 0.245
2019-11-28 12.84 0.245
2019-11-29 5.06 0.245
2019-11-29 21.28 0.245
2019-11-30 13.50 0.245
2019-12- 1 5.72 0.245
2019-12- 1 21.94 0.245
2019-12- 2 14.16 0.245
2019-12- 3 6.38 0.245
2019-12- 3 22.60 0.245
2019-12- 4 14.82 0.245
2019-12- 5 7.04 0.245
2019-12- 5 23.26 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2019-11-16 0.81 0.748
2019-11-16 17.03 0.748
2019-11-17 9.25 0.748
2019-11-18 1.47 0.748
2019-11-18 17.69 0.748
2019-11-19 9.91 0.748
2019-11-20 2.13 0.748
2019-11-20 18.35 0.748
2019-11-21 10.57 0.748
2019-11-22 2.79 0.748
2019-11-22 19.01 0.748
2019-11-23 11.23 0.748
2019-11-24 3.45 0.748
2019-11-24 19.67 0.748
2019-11-25 11.89 0.748
2019-11-26 4.11 0.748
2019-11-26 20.33 0.748
2019-11-27 12.55 0.748
2019-11-28 4.77 0.748
2019-11-28 20.99 0.748
2019-11-29 13.21 0.748
2019-11-30 5.43 0.748
2019-11-30 21.65 0.748
2019-12- 1 13.87 0.748
2019-12- 2 6.09 0.748
2019-12- 2 22.31 0.748
2019-12- 3 14.53 0.748
2019-12- 4 6.75 0.748
2019-12- 4 22.97 0.748
2019-12- 5 15.19 0.748

Clear Skies, Petr [2019-11-11 13:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it suspicious. A very tentative solution (may be entirely wrong) from the limited data:
http://www.asu.cas.cz/~asteroid/02516_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02516_2019a_p1.png

Vladimir would appreciate a help from other stations. Errors < 0.02 mag and long sessions are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2019-10-28 11:22, Ondrejov] Message sent to BinAstPhotSurvey conference

(53916) 2000 GW7 (Finished) [Add new note]
· This one was observed by Don Pray from Sugarloaf Mountain, by Russ Durkee from Shed of Science South, by Vladimir Benishek from Sopot, and by Walt Cooney from Madrona Peak. A good U = 2+ solution:
http://www.asu.cas.cz/~asteroid/53916.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-12-10 14:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:30 UT.
Don [2019-12-06 01:29, Sugarloaf] Message sent to observers

· Just started a run on this 12/4 at 2 UT

Russ [2019-12-04 02:11, Shed of Science]

· Just submitted data for short (4+ hour) run with Madrona Peak Observatory 24inch on night of Nov 30/Dec 1. [2019-12-03 17:50, Sonoita] Message sent to observers

· Just started a run on this one at about 4:40 UT
Russ [2019-12-02 04:40, Shed of Science]

· Started a run on this at ~01:45 UT.
Don [2019-12-01 02:08, Sugarloaf] Message sent to observers

· Don Pray has observed this new target from Sugarloaf Mountain, found a quite unusual behaviour. No solution so far, just the data folded so that you can see it:
http://www.asu.cas.cz/~asteroid/53916.png

We ask others here to help out. Good long sessions with errors < 0.02 mag are needed.

Clear Skies, Petr [2019-11-29 06:38, Ondrejov] Message sent to BinAstPhotSurvey conference

(8089) Yukar (Finished) [Add new note]
· This one was observed by Don Pray from Sugarloaf Mountain, by Vasilij Chiorny from Kharkiv and by Marek Husarik from Skalnate Pleso. A good U = 2+ solution:
http://www.asu.cas.cz/~asteroid/08089.png
A drop seen in the last 6 points of the first session has not been confirmed. Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-12-10 09:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:30 UT.
Don [2019-12-06 01:30, Sugarloaf] Message sent to observers

· Started this at about 01:45 UT.
Don [2019-12-01 02:07, Sugarloaf]

· I started a run on this at 00:40 UT. Hopefully, clouds will cooperate.
Don [2019-11-27 00:46, Sugarloaf] Message sent to observers

· I observed this on Nov 25 and 26.It was a very short run on the 25th.
Don [2019-11-26 19:10, Sugarloaf]

· Also following this tonight starting 11/25 3:00UT

Russ [2019-11-25 03:30, Shed of Science] Message sent to observers

· Observed this one tonight 21/22 Nov from 18:20 to 03:00 UT.
Vasilij Ch. [2019-11-22 04:30, Kharkiv]

· Don Pray took first night for this new target, found that it apparently attenuated before the end of the run:
http://www.asu.cas.cz/~asteroid/08089_2019a_porb.png
http://www.asu.cas.cz/~asteroid/08089_2019a_p1.png

Don would appreciate a help with confirmation. (His weather is unsettled currently.) Data with errors of 0.02 mag are needed and long sessions are preferred.

Clear Skies, Petr [2019-11-18 12:12, Ondrejov] Message sent to BinAstPhotSurvey conference

(1476) Cox (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot. It's U = 2 solution (there is an ambiguity of whether there are 2, 4 or 6 pairs of maxima and minima per period).
http://www.asu.cas.cz/~asteroid/01476.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-11-28 06:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this new target tonight.
Vladimir [2019-10-20 22:51, Sopot AO]

(5453) Zakharchenya (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05453.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-11-27 07:06, Ondrejov] Message sent to BinAstPhotSurvey conference

(1997) Leverrier (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique solution, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01997.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-11-10 15:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target on Oct 24 UT.
Don [2019-10-26 00:58, Sugarloaf]

(2467) Kollontai (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/02467.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-11-08 09:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on Oct 24 UT.
Don [2019-10-26 00:59, Sugarloaf]

· Observed this new target on Oct 20.
Don [2019-10-21 19:21, Sugarloaf] Message sent to BinAstPhotSurvey conference

(203131) 2000 SJ277 (Finished) [Add new note]
· Good data obtained for this one by Julian Oey from Leura and by Don Pray from Sugarloaf Mountain: Good solution and coverage, no significant deviation apparent.
http://www.asu.cas.cz/~asteroid/203131.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-11-05 12:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Julian Oey observed this new target from Leura. There appears to be present a second lightcurve component. A highly tentative solution:
http://www.asu.cas.cz/~asteroid/203131_2019b_p1.png
http://www.asu.cas.cz/~asteroid/203131_2019b_p2.png

More data are needed to confirm it. Good data with errors of 0.02 mag and long sessions are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2019-10-19 14:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observations 10/03, 10/06, 10/17, 10/18 [2019-10-19 04:54, Blue Mountains Obs]

(19127) Olegefremov (Finished) - suspect, collaboration needed [Add new note]
· It's a probable binary. Needs to be confirmed with events detection in the future. Lc decomposition:
http://www.asu.cas.cz/~asteroid/19127_2019a_p1.png
http://www.asu.cas.cz/~asteroid/19127_2019a_p2.png

Petr [2019-11-05 12:02, Ondrejov]

· Worked from SRO on 10-23 and 10-25 UT so far. Plan to work from SRO tonight, 10-27 UT, as well. -Walt [2019-10-26 18:44, Sonoita] Message sent to observers

· Will work from SRO tonight. -Walt [2019-10-22 21:21, Sonoita]

· Vladimir Benishek has observed this off-list Mars-crosser target from Sopot, found it interesting. Indeed, there appears to be present a second period (and a possible short and shallow attenuation event). A highly tentative decomposition (far from unique for the second period):
http://www.asu.cas.cz/~asteroid/19127_2019a_p1.png
http://www.asu.cas.cz/~asteroid/19127_2019a_p2.png

Vladimir would appreciate a help by others here. High quality data with errors < 0.02 mag and long sessions are needed.

Clear Skies, Petr [2019-10-22 19:42, Ondrejov] Message sent to BinAstPhotSurvey conference

(2019) vanAlbada (Finished) - new binary [Add new note]
· Our report on this one has appeared on CBET 4689, copied here for your convenience:

(2019) VAN ALBADA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
U.S.A.; M. Husarik, M. Pikler, G, Cervak, and D. Tomko, Skalnate Pleso
Observatory; B. Christmann, Soucieu-en-Jarrest, France; A. Aznar, Isaac
Aznar Observatory, Alcublas, Valencia, Spain; D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A.; F. Pilcher, Organ Mesa Observatory,
Las Cruces, NM, U.S.A.; V. Chiorny, Kharkiv Observatory; and A. Marchini, R.
Papini, and F. Salvaggio, Dipartimento di Scienze Fisiche, Della Terra e
Dell'Ambiente, University of Siena, report that photometric observations
taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.50-m
telescope at the Shed of Science South Observatory, a 0.61-m telescope at
the Skalnate Pleso Observatory, 0.28-m telescope at Soucieu-en-Jarrest, a
0.35-m telescope at the Isaac Aznar Observatory, a 0.50-m telescope at the
Sugarloaf Mountain Observatory, a 0.35-m telescope at the Organ Mesa
Observatory, a 0.70-m telescope at the Chuguev station of the Kharkiv
Observatory in Ukraine, and a 0.30-m telescope at the Astronomical
Observatory of the University of Siena during Sept. 22-Oct. 26 reveal that
minor planet (2019) is a binary system with an orbital period of 17.982 Â±
0.003 hr. The primary shows a period of 2.7294 Â± 0.0005 hr and has a
lightcurve amplitude of 0.16 magnitude at solar phases 2-3 degrees. Mutual
eclipse/occultation events that are 0.07 to 0.12 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.26.

2019 October 30 (CBET 4689) Daniel W. E. Green

Fyi, the lc decompositions:
http://www.asu.cas.cz/~asteroid/02019_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02019_2019a_p1.png
http://www.asu.cas.cz/~asteroid/02019_2019b_porb.png
http://www.asu.cas.cz/~asteroid/02019_2019b_p1.png

Follow-up observations in the next lunation would be useful for future modeling. Only good data with errors < 0.015 mag will be useful; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019-11-15 15.93 0.245
2019-11-16 9.91 0.245
2019-11-17 3.89 0.245
2019-11-17 21.87 0.245
2019-11-18 15.85 0.245
2019-11-19 9.84 0.245
2019-11-20 3.82 0.245
2019-11-20 21.80 0.245
2019-11-21 15.78 0.245
2019-11-22 9.76 0.245
2019-11-23 3.75 0.245
2019-11-23 21.73 0.245
2019-11-24 15.71 0.245
2019-11-25 9.69 0.245
2019-11-26 3.67 0.245
2019-11-26 21.66 0.245
2019-11-27 15.64 0.245
2019-11-28 9.62 0.245
2019-11-29 3.60 0.245
2019-11-29 21.58 0.245
2019-11-30 15.57 0.245
2019-12- 1 9.55 0.245
2019-12- 2 3.53 0.245
2019-12- 2 21.51 0.245
2019-12- 3 15.49 0.245
2019-12- 4 9.48 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2019-11-16 1.00 0.750
2019-11-16 18.98 0.750
2019-11-17 12.96 0.750
2019-11-18 6.94 0.750
2019-11-19 0.92 0.750
2019-11-19 18.91 0.750
2019-11-20 12.89 0.750
2019-11-21 6.87 0.750
2019-11-22 0.85 0.750
2019-11-22 18.83 0.750
2019-11-23 12.82 0.750
2019-11-24 6.80 0.750
2019-11-25 0.78 0.750
2019-11-25 18.76 0.750
2019-11-26 12.74 0.750
2019-11-27 6.73 0.750
2019-11-28 0.71 0.750
2019-11-28 18.69 0.750
2019-11-29 12.67 0.750
2019-11-30 6.65 0.750
2019-12- 1 0.64 0.750
2019-12- 1 18.62 0.750
2019-12- 2 12.60 0.750
2019-12- 3 6.58 0.750
2019-12- 4 0.56 0.750

Clear Skies, Petr [2019-10-30 08:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started this one for the night.

Russ [2019-10-23 01:57, Shed of Science] Message sent to observers

· Starting this one for the night shortly.

Russ [2019-10-22 01:21, Shed of Science]

· I observed this on Oct 20.
Don [2019-10-21 16:30, Sugarloaf]

· I just started about 1:50 UT 10/9. It is making a close pass by M74.

Russ [2019-10-11 03:32, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/02019_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02019_2019a_p1.png

The orbital period has been well established already. Before we publish this one on CBET, it would be good to take more high-quality data for both events in the next lunation. There seems to be some interesting evolution of the secondary event's shape and it would be good to confirm it (and refine the size ratio). Only high-quality data with errors of 0.01 mag and full event coverage will be useful; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019-10-17 10.68 0.251
2019-10-18 4.66 0.251
2019-10-18 22.64 0.251
2019-10-19 16.62 0.251
2019-10-20 10.60 0.251
2019-10-21 4.58 0.251
2019-10-21 22.56 0.251
2019-10-22 16.54 0.251
2019-10-23 10.52 0.251
2019-10-24 4.50 0.251
2019-10-24 22.48 0.251
2019-10-25 16.46 0.251
2019-10-26 10.44 0.251
2019-10-27 4.42 0.251
2019-10-27 22.40 0.251
2019-10-28 16.38 0.251
2019-10-29 10.36 0.251
2019-10-30 4.34 0.251
2019-10-30 22.32 0.251
2019-10-31 16.30 0.251
2019-11- 1 10.28 0.251
2019-11- 2 4.26 0.251
2019-11- 2 22.24 0.251
2019-11- 3 16.22 0.251
2019-11- 4 10.20 0.251
2019-11- 5 4.18 0.251
2019-11- 5 22.16 0.251
2019-11- 6 16.14 0.251
2019-11- 7 10.12 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2019-10-17 1.59 0.746
2019-10-17 19.57 0.746
2019-10-18 13.55 0.746
2019-10-19 7.53 0.746
2019-10-20 1.51 0.746
2019-10-20 19.49 0.746
2019-10-21 13.47 0.746
2019-10-22 7.45 0.746
2019-10-23 1.43 0.746
2019-10-23 19.41 0.746
2019-10-24 13.39 0.746
2019-10-25 7.37 0.746
2019-10-26 1.35 0.746
2019-10-26 19.33 0.746
2019-10-27 13.31 0.746
2019-10-28 7.29 0.746
2019-10-29 1.27 0.746
2019-10-29 19.25 0.746
2019-10-30 13.23 0.746
2019-10-31 7.21 0.746
2019-11- 1 1.19 0.746
2019-11- 1 19.17 0.746
2019-11- 2 13.15 0.746
2019-11- 3 7.13 0.746
2019-11- 4 1.11 0.746
2019-11- 4 19.09 0.746
2019-11- 5 13.07 0.746
2019-11- 6 7.05 0.746
2019-11- 7 1.03 0.746

Clear Skies, Petr [2019-10-10 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· I just started about 1:50 UT 10/9. It is making a close pass by M74.

Russ [2019-10-09 23:57, Shed of Science] Message sent to observers

· Ran from Starry Night Observatory in Columbus, TX last night from 2458765.649 to 2458765.920 (about 3:30UT to 10:20 UT). -Walt [2019-10-09 19:15, Sonoita]

· I just started about 1:50 UT 10/9. It is making a close pass by M74.

Russ [2019-10-09 02:48, Shed of Science] Message sent to observers

· Working this one tonight.
Vladimir [2019-10-08 22:12, Sopot AO] Message sent to BinAstPhotSurvey conference

· Just started under good conditions.

Russ [2019-10-08 01:48, Shed of Science] Message sent to observers

· Starting a run on this for the night.
Russ [2019-10-05 03:13, Shed of Science]

· Planning to start this at 01:40, Oct 5 UT.
Don [2019-10-04 23:50, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed this one tonight 02/03 Oct from 17:50 to 23:50 UT.
Vasilij Ch. [2019-10-03 02:14, Kharkiv] Message sent to observers

· Observed it from 04:46 UTC - 11:53 UTC on Oct. 01, 2019 with 0.5 meter F/2.8 telescope in my backyard in Tucson, AZ. Should be able to process the data today after I finish teaching. SNR 70-100 in 120 sec exposures. [2019-10-02 17:57, Vishnu Reddy/Tucson] Message sent to observers

· Observed it from 04:46 UTC - 11:53 UTC on Oct. 01, 2019 with 0.5 meter F/2.8 telescope in my backyard in Tucson, AZ. Should be able to process the data today after I finish teaching. SNR 70-100 in 120 sec exposures. [2019-10-01 21:37, Vishnu Reddy/Tucson] Message sent to observers

· Combined data from Vladimir Benishek and Frederick Pilcher, for one possible orbital period:
http://www.asu.cas.cz/~asteroid/02019_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02019_2019a_p1.png

The solution is not unique, there are also other periods possible. Below is a tentative ephemeris (but don't limit your observations just to the predicted event times, as it may be wrong). Data with errors < 0.015 mag are needed.

Date/Time UTC (LTc.) Phase
--------------------------
2019-10- 1 17.11 0.252
2019-10- 2 11.09 0.252
2019-10- 3 5.07 0.252
2019-10- 3 23.05 0.252
2019-10- 4 17.03 0.252
2019-10- 5 11.01 0.252
2019-10- 6 4.99 0.252
2019-10- 6 22.97 0.252
2019-10- 7 16.95 0.252
2019-10- 8 10.93 0.252
2019-10- 9 4.91 0.252
2019-10- 9 22.89 0.252
2019-10-10 16.87 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2019-10- 2 2.10 0.752
2019-10- 2 20.08 0.752
2019-10- 3 14.06 0.752
2019-10- 4 8.04 0.752
2019-10- 5 2.02 0.752
2019-10- 5 20.00 0.752
2019-10- 6 13.98 0.752
2019-10- 7 7.96 0.752
2019-10- 8 1.94 0.752
2019-10- 8 19.92 0.752
2019-10- 9 13.90 0.752
2019-10-10 7.88 0.752

Clear Skies, Petr [2019-10-01 13:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed it from 04:46 UTC - 11:53 UTC on Oct. 01, 2019 with 0.5 meter F/2.8 telescope in my backyard in Tucson, AZ. Should be able to process the data today after I finish teaching. SNR 70-100 in 120 sec exposures. [2019-10-01 12:47, Vishnu Reddy/Tucson] Message sent to observers

· Vladimir Benishek observed this off-list target from Sopot, catched what appears to be a mutual event:
http://www.asu.cas.cz/~asteroid/02019_20190928.png

He would appreciate a help by other observers. Take data with errors < 0.015 mag and sessions longer than 2 hours. (Data with higher errors or shorter sessions will be probably not much useful. I suspect that there is present also a second rotational lightcurve component with low amplitude outside events and we need to confirm it with high-quality data.)

Clear Skies, Petr [2019-09-30 06:11, Ondrejov] Message sent to BinAstPhotSurvey conference

(11420) 1999 KR14 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/11420.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Vladimir.

Petr [2019-10-24 13:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a second run on this new target about 19:50 UT, Oct. 20.
Vladimir [2019-10-20 22:57, Sopot AO]

(31560) 1999 EQ14 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot on 3 nights: Thanks to the high quality data, it is a good solution (U = 2+) despite the low amplitude. Excellent coverage, no deviation seen.
http://www.asu.cas.cz/~asteroid/31560.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Vladimir.

Petr [2019-10-22 19:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target tonight.
Vladimir [2019-10-08 22:04, Sopot AO]

(18303) 1980 PU (Finished) - return binary [Add new note]
· Our report on this one has appeared on CBET 4676, copied below for your convenience.

Cheers, Petr

(18303) 1980 PU
V. Benishek, Belgrade Astronomical Observatory; P. Pravec and P.
Kusnirak, Ondrejov Observatory; R. Durkee, Shed of Science South Observatory,
Pontotoc, TX, U.S.A.; D. Pray, Sugarloaf Mountain Observatory, South
Deerfield, MA, U.S.A.; V. Chiorny and O. Mikhalchenko, Kharkiv Observatory;
M. Husarik and M. Pikler, Skalnate Pleso Observatory; J. Oey, Blue Mountains
Observatory, Leura, NSW, Australia; P. Bacci and M. Maestripieri,
Astronomical Observatory, San Marcello Pistoiese, Italy; and A. Aznar, Isaac
Aznar Observatory, Alcublas, Valencia, Spain, report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in
Serbia, a 0.50-m telescope at the Shed of Science South Observatory, a
0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.70-m telescope
at the Chuguev station of the Kharkiv Observatory in Ukraine, a 0.61-m
telescope at the Skalnate Pleso Observatory, a 0.35-m telescope at the Blue
Mountains Observatory, a 0.60-m telescope at the San Marcello Pistoiese
Observatory, and a 0.35-m telescope at the Isaac Aznar Observatory during
Aug. 10-Oct. 2 reveal that minor planet (18303) is a binary system with an
orbital period of 12.270 Â± 0.003 hr. The primary shows a period of
2.72627 Â± 0.00010 hr and has a lightcurve amplitude of 0.10 magnitude at
solar phases 4-14 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.05 to 0.12 magnitude deep indicate
a secondary-to-primary mean-diameter ratio of 0.24 Â± 0.03.

2019 October 9 (CBET 4676) Daniel W. E. Green [2019-10-10 07:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our campaign on this new binary is over.
http://www.asu.cas.cz/~asteroid/18303_2019a_porb.png
http://www.asu.cas.cz/~asteroid/18303_2019a_p1.png
http://www.asu.cas.cz/~asteroid/18303_2019b_porb.png
http://www.asu.cas.cz/~asteroid/18303_2019b_p1.png
We are going to do a report for CBET.

Cheers, Petr [2019-10-07 07:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started under good conditions.

Russ [2019-10-05 01:41, Shed of Science] Message sent to observers

· Just started under good conditions.

Russ [2019-10-02 01:44, Shed of Science]

· Starting run on this one a bit late. Conditions are ok.
Russ [2019-09-30 03:00, Shed of Science] Message sent to observers

· observed on 09/22, 09/23, 09/24 [2019-09-28 06:04, Blue Mountains Obs]

· Going for one more run tonight on this one started about 2:30UT 9/27 Hopefully with better luck this time.

Russ [2019-09-27 01:52, Shed of Science] Message sent to observers

· Again Following this one tonight Started about 2:30 UT 9/24 Conditions may not last.

Russ [2019-09-24 02:44, Shed of Science]

· Starting on this one. Conditions ok for a good portion of the night.

Russ [2019-09-23 02:27, Shed of Science] Message sent to observers

· Working this one starting now and going for at least six hours.

Russ [2019-09-19 01:30, Shed of Science]

· Our current solution for this one:
http://www.asu.cas.cz/~asteroid/18303_2019a_porb.png
http://www.asu.cas.cz/~asteroid/18303_2019a_p1.png

Before we publish it on CBET, more good data with errors < 0.02 mag are needed (don't bother in sub-optimal conditions) to refine the solution. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 9-17 2.04 0.249
2019- 9-17 14.31 0.249
2019- 9-18 2.58 0.249
2019- 9-18 14.85 0.249
2019- 9-19 3.12 0.249
2019- 9-19 15.39 0.249
2019- 9-20 3.66 0.249
2019- 9-20 15.93 0.249
2019- 9-21 4.20 0.249
2019- 9-21 16.47 0.249
2019- 9-22 4.74 0.249
2019- 9-22 17.01 0.249
2019- 9-23 5.28 0.249
2019- 9-23 17.55 0.249
2019- 9-24 5.82 0.249
2019- 9-24 18.09 0.249
2019- 9-25 6.36 0.249
2019- 9-25 18.63 0.249
2019- 9-26 6.90 0.249
2019- 9-26 19.17 0.249
2019- 9-27 7.44 0.249
2019- 9-27 19.71 0.249
2019- 9-28 7.98 0.249
2019- 9-28 20.25 0.249
2019- 9-29 8.52 0.249
2019- 9-29 20.79 0.249
2019- 9-30 9.06 0.249
2019- 9-30 21.33 0.249
2019-10- 1 9.60 0.249
2019-10- 1 21.87 0.249
2019-10- 2 10.14 0.249
2019-10- 2 22.41 0.249
2019-10- 3 10.68 0.249
2019-10- 3 22.95 0.249
2019-10- 4 11.22 0.249
2019-10- 4 23.49 0.249
2019-10- 5 11.76 0.249
2019-10- 6 0.03 0.249
2019-10- 6 12.30 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2019- 9-17 8.18 0.750
2019- 9-17 20.45 0.750
2019- 9-18 8.72 0.750
2019- 9-18 20.99 0.750
2019- 9-19 9.26 0.750
2019- 9-19 21.53 0.750
2019- 9-20 9.80 0.750
2019- 9-20 22.07 0.750
2019- 9-21 10.34 0.750
2019- 9-21 22.61 0.750
2019- 9-22 10.88 0.750
2019- 9-22 23.15 0.750
2019- 9-23 11.42 0.750
2019- 9-23 23.69 0.750
2019- 9-24 11.96 0.750
2019- 9-25 0.23 0.750
2019- 9-25 12.50 0.750
2019- 9-26 0.77 0.750
2019- 9-26 13.04 0.750
2019- 9-27 1.31 0.750
2019- 9-27 13.58 0.750
2019- 9-28 1.85 0.750
2019- 9-28 14.12 0.750
2019- 9-29 2.39 0.750
2019- 9-29 14.66 0.750
2019- 9-30 2.93 0.750
2019- 9-30 15.20 0.750
2019-10- 1 3.47 0.750
2019-10- 1 15.74 0.750
2019-10- 2 4.01 0.750
2019-10- 2 16.28 0.750
2019-10- 3 4.55 0.750
2019-10- 3 16.82 0.750
2019-10- 4 5.09 0.750
2019-10- 4 17.36 0.750
2019-10- 5 5.63 0.750
2019-10- 5 17.90 0.750
2019-10- 6 6.17 0.750
2019-10- 6 18.44 0.750

Clear Skies, Petr [2019-09-11 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 04/09 and 03/09 for 6-7 hours per session under good condition. [2019-09-07 20:48, Blue Mountains Obs] Message sent to observers

· I observed this one on 6/7 Sept from 19.2 UT to 01.0 UT.
Vasilij Ch. [2019-09-07 09:39, Kharkiv]

· JUst started this one for the next five hours or longer.

Russ [2019-09-07 03:15, Shed of Science] Message sent to observers

· Planning to start this at 01:35 UT.
Don [2019-09-05 00:55, Sugarloaf]

· Planning to start this at 01:45 UT.
Don [2019-09-04 01:27, Sugarloaf]

· Planning to start this one very shortly.
Russ [2019-09-03 01:55, Shed of Science] Message sent to observers

· Planning to start this at 02:00 UT.
Don [2019-08-31 01:55, Sugarloaf]

· I plan to start a run on this at 02:00 UT.
Don [2019-08-30 01:25, Sugarloaf]

· I observed this one on 28/29 Aug from 18.00 UT to 01.00 UT.Vasilij Ch. [2019-08-29 01:09, Kharkiv] Message sent to observers

· Additional data by Vladimir Benishek from Sopot, Vasilij Chiorny from Kharkiv, Don Pray from Sugarloaf Mountain, and Marek Husarik and Michal Pikler from Skalnate Pleso show that there are actually two periods. The 12.28-h lightcurve component looks like a secondary's rotational lightcurve, so it appears to be probable binary.
http://www.asu.cas.cz/~asteroid/18303_2019a_p1.png
http://www.asu.cas.cz/~asteroid/18303_2019a_p2.png
http://www.asu.cas.cz/~asteroid/18303_2019a_all.png
http://www.asu.cas.cz/~asteroid/18303_2019a_p2nsp.png

More data are still needed to improve the solution. While there has already occurred a phase shift over the covered interval allowing to resolve the two periods that couldn't be resolved with the shorter data before due to their near-commensurability ---note that P_2 - 4.5*P_1 = 0.012 +/- 0.002 h, so their difference from the exact commenurability is detected at 6 sigma formally now---, it still needs to be improved, i.e., the period uncertainty needs to be reduced. I encourage you to take more good-quality data with errors not greater than 0.02 mag and session durations > 4 h (i.e., > 1/3 of P_2).

Clear Skies, Petr [2019-08-28 14:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start a run on this one tonight (Aug. 27-28).
Vladimir [2019-08-27 19:22, Sopot AO] Message sent to observers

· I will try for this one tonight on 8/27. Should be able to run most of the night.

Russ [2019-08-27 02:11, Shed of Science]

· Planning to start a run at 02:15 UT, Aug 27.
Don [2019-08-27 01:58, Sugarloaf] Message sent to observers

· Observed on 25/26 Aug from 21.4 UT to 00.3 UT. Vasilij Ch. [2019-08-26 20:03, Kharkiv]

· Observed this one on 23/24 Aug from 18.4 to 23.0 UT. Vasilij Ch. [2019-08-25 18:01, Kharkiv] Message sent to observers

· Observed on Aug 24 from 20 to 22 UT.
Michal [2019-08-25 15:28, SkalnatePleso] [Remove]

· Vladimir Benishek observed this new target from Sopot on 4 nights. The data is fit with a hexamodal lightcurve with period 8.17 h, but the amplitude is somewhat high for that (but not entirely impossible at the non-zero solar phases) and we suspect that it might be actually a shorter period with a second lightcurve component present (possible binary).
http://www.asu.cas.cz/~asteroid/18303.png

Vladimir may not be able to get enough data to establish this case from his station only. Good-quality data (errors not greater than 0.02 mag) from other station(s), prefereably at substantially different longitudes, will be needed to resolve the case. I encourage you to help out.

Clear Skies, Petr [2019-08-23 07:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one was observed on two nights: Aug. 09-10, 21:03-02:08 UT and Aug. 10-11, 21:08-02:06 UT.
Vladimir [2019-08-11 11:37, Sopot AO]

(354030) 2001 RB18 (Finished) [Add new note]
· Don Pray observed this new NEA target on 5 nights from Sugarloaf Mountain. Finally we obtained a good solution (U = 3-); its lightcurve is a little bit less regular than most, with up to the 8th degree of Fouries series highly significant.
http://www.asu.cas.cz/~asteroid/354030.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2019-10-09 13:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 02:15 UT.
Don [2019-10-05 01:32, Sugarloaf]

· Starting a third session on this at 01:15 UT.
Don [2019-09-25 00:12, Sugarloaf] Message sent to observers

· Started a run on this at 00:55 UT.
Don [2019-09-20 01:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

(233080) 2005 PG (Finished) [Add new note]
· Julian Oey observed this Mars-crosser from Leura: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/233080.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Julian.

Petr [2019-10-03 07:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 10/01 and 10/02 weather condition is reasonable. [2019-10-03 07:14, Blue Mountains Obs] Message sent to observers

· starting to observe this new target [2019-09-29 23:28, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(4686) Maisica (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and by Marek Husarik from Skalnate Pleso: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04686.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-10-02 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 01:45 UT.
Don [2019-09-25 00:10, Sugarloaf]

· Observed from 19 UT.
Marek [2019-09-23 23:43, SkalnatePleso] [Remove]
Message sent to observers

· Starting this one. First night run about 4hr shows a minimum and a little bit of maximum. I suppose period about >14hr.
Marek [2019-09-22 21:28, SkalnatePleso] [Remove]

· Starting a run on this at 01:45, Sep 22 UT.
Don [2019-09-22 01:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this one at 22:30 UT.
Marek [2019-09-21 22:43, SkalnatePleso] [Remove]
Message sent to observers

· Starting this at 01:45 UT.
Don [2019-09-20 01:36, Sugarloaf] Message sent to BinAstPhotSurvey conference

(7516) Kranj (Finished) [Add new note]
· Julian Oey observed this return "prime suspect" from Leura recently: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07516_b9.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-09-27 12:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· start observing 09/22 and 09/23. Earlier data obtained but moon was too bright. [2019-09-23 21:13, Blue Mountains Obs]

(4263) Abashiri (Finished) [Add new note]
· Done for this apparition. Petr [2019-09-24 08:46, Ondrejov]

· Plan to start this at 01:45 UT.
Don [2019-09-22 01:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray did this return "prime suspect" from Sugarloaf Mountain on three nights: Good solution, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04263_b6.png
Well, with the amplitude 0.42 mag now, it's not a "prime suspect" any longer. Apparently we observed it at high-latitude aspects in the previous two apparitions when the amplitude was 0.11-0.15 mag ....

Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2016-10-26 08:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:20 UT.
Don [2016-10-25 00:52, Sugarloaf] Message sent to observers

· Starting this one at 01:20 UT.
Don [2016-10-12 01:04, Sugarloaf]

· Started a run on this one at 01:20 UT.
Don [2016-10-11 01:37, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Julian Oey has worked this return "prime suspect" extensively around this year's opposition. A few deviations seen, but not significant/convincing,
http://www.asu.cas.cz/~asteroid/04263_b2.png
Cf. with data from the 2008 apparition:
http://www.asu.cas.cz/~asteroid/04263.png

Closed now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Best, Petr [2012-07-31 09:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2012 07 19 in good conditions. Haven't reduced the data yet. [2012-07-20 06:31, HuntersHill] Message sent to observers

· observed from 09:28UT to 19:49UT 07/02 near full moon but data still usable. period refined to 4.882h. [2012-07-05 11:29, Blue Mountains Obs]

· Started observation from 10:20UT to 20:00UT 06/24. period of 4.95h found. [2012-06-25 02:21, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Don, David, and Kamil have observed this one on 8 nights (3 of them long, and 5 half nights): Unique solution, good coverage, no significant deviation. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2008-03-07 10:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-03-06 from 09:29UT to 16:42UT in good conditions. Data revealed a period of 4.95 +/- 0.05hrs with an amplitude of 0.14 +/- 0.01mag. Data sent to Petr. [2008-03-06 21:21, HuntersHill] Message sent to observers

· I'll be starting this at 01:10 UT.
Don [2008-03-06 01:13, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing this one from 20:30 UT expecting to get one full period (5 hr) in photometric conditions. The first (testing) night with coma-corrector... Best wishes, Kamil [2008-03-05 22:57, Ondrejov] Message sent to observers

· Don has taken two full and three half nights for this one. A period of 4.882 h is probable, but one session from a different longitude than Don's is needed to nail it down. I encourage someone to help out.
http://www.asu.cas.cz/~asteroid/04263.png

Clear Skies, Petr [2008-03-05 08:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:40 UT.
Don [2008-02-29 03:19, CarbuncleHill]

· I started this new target at 04:20 UT, stopping 7267 as Peter seems to have finished it.
Don [2008-02-17 04:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(2580) Smilevskia (Finished) - slow rotator [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Object closed for the Survey.

Petr [2019-09-23 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one on 7/8 Aug from 22.4 to 24.7 UT.
Vasilij Ch. [2019-08-08 14:16, Kharkiv] Message sent to observers

· Started this on Aug 6 UT.
Don [2019-08-06 18:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Unsuccessfull attempt. [2016-12-02 10:18, Ondrejov]

· I plan to do it tonight for 6h30. begin at 17:00 UT [2016-11-09 15:12, Les Makes]

· starting a new target tonight [2016-10-15 13:17, Les Makes]

(80593) 2000 AG144 (Finished) [Add new note]
· This new target was observed by Vladimir Benishek from Sopot and by Vasilij Chiorny from Kharkiv. Despite its low amplitude, it is a good U = 2+ solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/80593.png
http://www.asu.cas.cz/~asteroid/80593_nsp.png

Good work guys.

Petr [2019-09-12 10:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed of 3 short sessions on 21/22 Aug (23.6 to 01.3 UT), on 22/23 Aug (19.5 to 21.7 UT) and 24/25 Aug (22.5 to 01.3 UT). Vasilij Ch. [2019-08-26 19:57, Kharkiv] Message sent to observers

· Observed on Aug. 05 (22:08-23:19 UT) and Aug. 11-12 (21:03-02:13 UT).
Vladimir [2019-08-12 15:57, Sopot AO] Message sent to BinAstPhotSurvey conference

(5872) Sugano (Finished) - return binary [Add new note]
· Done for the 2nd apparition. Petr [2019-09-11 08:38, Ondrejov]

· I started a run on this at 00:40 UT.
Don [2019-09-05 00:55, Sugarloaf] Message sent to observers

· I started this one around 00:30 UT.
Don [2019-09-04 01:25, Sugarloaf]

· I started this one at 01:30 UT.
Don [2019-08-31 01:54, Sugarloaf]

· I started this at 01:00 UT.
Don [2019-08-30 01:23, Sugarloaf] Message sent to observers

· Observed this object on this night 21/22 Aug from 19.0 to 23.3 UT.
Vasilij Ch. [2019-08-22 01:35, Kharkiv]

· Our data for this binary in its current 2nd apparition so far:
http://www.asu.cas.cz/~asteroid/05872_2019a_porb.png
http://www.asu.cas.cz/~asteroid/05872_2019a_p1.png

More data with errors of 0.02 mag (don't bother in sub-optimal conditions) would be useful. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 8-19 5.55 0.282
2019- 8-19 23.60 0.282
2019- 8-20 17.65 0.282
2019- 8-21 11.70 0.282
2019- 8-22 5.75 0.282
2019- 8-22 23.80 0.282
2019- 8-23 17.85 0.282
2019- 8-24 11.90 0.282
2019- 8-25 5.95 0.282
2019- 8-26 0.00 0.282
2019- 8-26 18.05 0.282
2019- 8-27 12.10 0.282
2019- 8-28 6.15 0.282
2019- 8-29 0.20 0.282
2019- 8-29 18.25 0.282
2019- 8-30 12.30 0.282
2019- 8-31 6.35 0.282
2019- 9- 1 0.40 0.282
2019- 9- 1 18.45 0.282
2019- 9- 2 12.50 0.282
2019- 9- 3 6.55 0.282
2019- 9- 4 0.60 0.282
2019- 9- 4 18.65 0.282
2019- 9- 5 12.70 0.282
2019- 9- 6 6.75 0.282
2019- 9- 7 0.80 0.282
2019- 9- 7 18.85 0.282

Date/Time UTC (LTc.) Phase
--------------------------
2019- 8-18 20.52 0.782
2019- 8-19 14.57 0.782
2019- 8-20 8.62 0.782
2019- 8-21 2.67 0.782
2019- 8-21 20.72 0.782
2019- 8-22 14.77 0.782
2019- 8-23 8.82 0.782
2019- 8-24 2.87 0.782
2019- 8-24 20.92 0.782
2019- 8-25 14.97 0.782
2019- 8-26 9.02 0.782
2019- 8-27 3.07 0.782
2019- 8-27 21.12 0.782
2019- 8-28 15.17 0.782
2019- 8-29 9.22 0.782
2019- 8-30 3.27 0.782
2019- 8-30 21.32 0.782
2019- 8-31 15.37 0.782
2019- 9- 1 9.42 0.782
2019- 9- 2 3.47 0.782
2019- 9- 2 21.52 0.782
2019- 9- 3 15.57 0.782
2019- 9- 4 9.62 0.782
2019- 9- 5 3.67 0.782
2019- 9- 5 21.72 0.782
2019- 9- 6 15.77 0.782
2019- 9- 7 9.82 0.782

Clear Skies, Petr [2019-08-13 11:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started 8/2 at 3:30UT.

Russ [2019-08-02 04:09, Shed of Science] Message sent to observers

· Observed on July 26, 20:04-23:33 UT.
Vladimir [2019-07-29 11:49, Sopot AO] Message sent to BinAstPhotSurvey conference

· I'm starting this at 03:10 UT.
Don [2019-07-27 01:50, Sugarloaf]

· Did a run on this starting at 03:25, July 25 UT, and will do it again tonight starting at 03:20 UT.
Don [2019-07-26 01:30, Sugarloaf] Message sent to observers

· Just started this one tonight.

Russ [2019-07-25 05:17, Shed of Science]

· Started tonight at 7/24 at 4:30 UT

Russ [2019-07-24 04:23, Shed of Science] Message sent to observers

· Did a run on this last night starting at 4UT.

Russ [2019-07-20 15:37, Shed of Science]

· Planning to do a run on this tonight, starting at 04:40 UT.
Don [2019-07-09 01:49, Sugarloaf] Message sent to observers

· Started on last night with 2,6 hour long session. No attenuation detected. Peter K. [2019-07-06 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement on this one has appeared on CBET 4327, copied below for your convenience.

Cheers, Petr

(5872) SUGANO
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, K. Hornoch, and P. Kusnirak, Ondrejov Observatory; A. Carbognani,
Astronomical Observatory of the Aosta Valley Autonomous Region, Italy; Yu. N.
Krugly and V. Chiorny, Kharkiv Observatory; R. Inasaridze, V. Ayvazian, and
O. Kvaratskhelia, Abastumani Observatory; M. Husarik and M. Pikler, Skalnate
Pleso Observatory; V. Benishek, Belgrade Astronomical Observatory; and I.
Molotov, Keldysh Institute of Applied Mathematics, Moscow, report that
photometric observations taken with a 0.50-m telescope at the Sugarloaf
Mountain Observatory, a 0.65-m telescope at the Ondrejov Observatory, a
0.81-m telescope at the Observatory of the Aosta Valley Autonomous Region, a
0.70-m telescope at the Chuguev station of the Kharkiv Observatory in
Ukraine, a 0.70-m telescope at the Abastumani Observatory, a 0.6-m telescope
at the Skalnate Pleso Observatory, and a 0.35-m telescope at the Sopot
Observatory in Serbia during 2016 Sept. 23-Oct. 2 reveal that minor planet
(5872) is a binary system with an orbital period of 18.04 Â± 0.02 hr. The
primary shows a period of 3.3642 Â± 0.0002 hr and has a lightcurve amplitude
of 0.11 mag at solar phases 15-20 degrees, suggesting a nearly spheroidal
shape. Mutual eclipse/occultation events that were 0.04- to 0.12-magnitude
deep indicate a lower limit on the secondary-to-primary mean-diameter ratio
of 0.30. The event depth progressively decreased during the observational
interval, indicating that the system moved away from the eclipse geometry.
Additional observations taken during Oct. 3-8 showed that the mutual events
disappeared.

2016 October 11 (CBET 4327) Daniel W. E. Green [2016-10-11 06:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Extensive observations by several of you have revealed an interesting event evolution in this new binary. The events (apparently partial) were observed from 2016-09-23.2 to 2016-10-02.9, but with progressively decreasing depth. And they were not present (or maybe only possible small hints of 0.01-0.02mag depth on some nights) since 2016-10-03.8. See following plots with the decomposed lc components:
http://www.asu.cas.cz/~asteroid/05872_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05872_2016a_p1.png
http://www.asu.cas.cz/~asteroid/05872_2016a_p2.png
http://www.asu.cas.cz/~asteroid/05872_2016b_porb.png
http://www.asu.cas.cz/~asteroid/05872_2016b_p1.png
http://www.asu.cas.cz/~asteroid/05872_2016b_p2.png
http://www.asu.cas.cz/~asteroid/05872_2016_p1_nsp.png
http://www.asu.cas.cz/~asteroid/05872_2016_p2_nsp.png
(The second period P_2 improves the fit and seems to be real, but its confirmation and revealing its nature ---e.g., whether it belongs to the observed close secondary or to a third body in the system--- will have to wait for future.)

Unlike most other asteroid binaries (as we have shown in the paper Pravec et al., 2012, "Binary asteroid population. 2. Anisotropic distribution of orbit poles of small,
inner main-belt binaries", Icarus 218, 125â€“143), this one must have a high obliquity, i.e., the orbital pole not very far from the ecliptic. It will be an interesting modeling when we get enough data in the future.

I'll draft an announcement for CBET tomorrow. Thanks all for your great work on this unusual case!

Cheers, Petr [2016-10-07 14:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Obtained 3hrs (17-20 UT) on Oct. 6 at Abastumani.
Yura [2016-10-07 01:28, Kharkiv] Message sent to observers

· Planning to start this at 02:00, and should catch much of the 0.748 phase event (if it still exists).
Don [2016-10-07 01:17, Sugarloaf]

· I obtained a session on 5872 last night (Oct. 05-06, 19:24-02:29 UT).

Vladimir [2016-10-06 12:24, Sopot AO] Message sent to observers

· I plan to start this at 02:00, Oct 6 UT, and hope to catch the 0.748 phase event. [2016-10-05 23:27, Sugarloaf]

· Obtained 3hrs (17-20 UT) on Oct. 3 at Abastumani.
Yura [2016-10-05 09:19, Kharkiv] Message sent to observers

· Planning to start a run at 02:10 UT and hope to catch the 0.25 phase event.
Don [2016-10-05 01:43, Sugarloaf]

· Planning to observe from 22 UT to 04 UT tonight with very clear sky. Albino C. [2016-10-03 17:48, OAVdA (B04)] Message sent to BinAstPhotSurvey conference

· Peter Kusnirak took a 6-hr session here on 09-30.0. The 0.25-phase event, which looks to be secondary, appears to be shallowing:
http://www.asu.cas.cz/~asteroid/05872_porb.png
http://www.asu.cas.cz/~asteroid/05872_p1.png
We may be moving out of event geometry. Event monitoring will be particularly useful (and we still need to get one more coverage of the 0.75-phase event for publishing it on CBET). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-10- 3 17.12 0.250
2016-10- 4 11.18 0.250
2016-10- 5 5.24 0.250
2016-10- 5 23.30 0.250
2016-10- 6 17.36 0.250
2016-10- 7 11.42 0.250
2016-10- 8 5.48 0.250
2016-10- 8 23.54 0.250
2016-10- 9 17.60 0.250
2016-10-10 11.66 0.250
2016-10-11 5.72 0.250
2016-10-11 23.78 0.250
2016-10-12 17.84 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2016-10- 4 2.11 0.748
2016-10- 4 20.17 0.748
2016-10- 5 14.23 0.748
2016-10- 6 8.29 0.748
2016-10- 7 2.35 0.748
2016-10- 7 20.41 0.748
2016-10- 8 14.47 0.748
2016-10- 9 8.53 0.748
2016-10-10 2.59 0.748
2016-10-10 20.65 0.748
2016-10-11 14.71 0.748
2016-10-12 8.77 0.748

Clear Skies, Petr [2016-10-03 10:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 18:15 UT 02/03 Oct 2016 in good conditions. Vasilij Ch. [2016-10-02 19:52, Kharkiv] Message sent to observers

· Planning to observe from 20 UT to 0 UT tonight. Peter K. [2016-09-29 19:04, Ondrejov]

· New data by Albino Carbognani, Don Pray and Kamil Hornoch joined in. The solution is unique now:
http://www.asu.cas.cz/~asteroid/05872_porb.png
http://www.asu.cas.cz/~asteroid/05872_p1.png

At least one more good session (errors < 0.02 mag) for each of the two events is needed before we can publish this one on CBET; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-29 22.96 0.252
2016- 9-30 17.04 0.252
2016-10- 1 11.12 0.252
2016-10- 2 5.20 0.252
2016-10- 2 23.28 0.252
2016-10- 3 17.36 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-29 13.73 0.742
2016- 9-30 7.81 0.742
2016-10- 1 1.89 0.742
2016-10- 1 19.97 0.742
2016-10- 2 14.05 0.742
2016-10- 3 8.13 0.742

Clear Skies, Petr [2016-09-29 08:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· One night by Marek Husarik and coll. from Skalnate Pleso joined in. A tentative decomposition:
http://www.asu.cas.cz/~asteroid/05872_p1.png
http://www.asu.cas.cz/~asteroid/05872_p1_nsp.png
http://www.asu.cas.cz/~asteroid/05872_porb.png

Observations at any time (orbital phase) are needed. Particularly useful will be following: The orbital period solution is ambiguous ---it is 18.08 h or twice that--- and critical observations for resolving it will be around the predicted times for the 0.75-phase event (for the P_orb = 18.08 h solution), see the ephemeris below. If there are events present around the times, it is 18.08 h. If they are not there, P_orb is twice that.

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-28 10.80 0.252
2016- 9-29 4.88 0.252
2016- 9-29 22.96 0.252
2016- 9-30 17.04 0.252
2016-10- 1 11.12 0.252
2016-10- 2 5.20 0.252
2016-10- 2 23.28 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-28 19.83 0.752
2016- 9-29 13.91 0.752
2016- 9-30 7.99 0.752
2016-10- 1 2.07 0.752
2016-10- 1 20.15 0.752
2016-10- 2 14.23 0.752
2016-10- 3 8.31 0.752

Clear Skies, Petr [2016-09-28 07:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 02:40 UT.
Don [2016-09-27 23:41, Sugarloaf]

· We done it last night. Tonight again.
The sharp minimum is present too in our data. [2016-09-27 20:00, SkalnatePleso] [Remove]
Message sent to observers

· Don Pray has observed this new target from Sugarloaf Mountain on three nights, found a peculiar lc:
http://www.asu.cas.cz/~asteroid/05872.png

We ask others here to help out. Long sessions in good conditions should be most useful to reveal what's in this one.

Clear Skies!

Petr [2016-09-26 13:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this on Sep 25 and plan to again tonight.

Don [2016-09-26 01:07, Sugarloaf]

· Started this new target on Sep 23.
Don [2016-09-24 01:37, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5536) Honeycutt (Finished) - return binary [Add new note]
· Done for the 2nd apparition. Petr [2019-09-11 08:38, Ondrejov]

· Our data for this binary in its current 2nd apparition so far:
http://www.asu.cas.cz/~asteroid/05536_2019a_porb.png
http://www.asu.cas.cz/~asteroid/05536_2019a_p1.png
http://www.asu.cas.cz/~asteroid/05536_2019b_porb.png
http://www.asu.cas.cz/~asteroid/05536_2019b_p1.png

More data with errors < 0.02 mag (don't bother in sub-optimal conditions) would be useful for future refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 8-18 19.81 0.252
2019- 8-19 12.13 0.252
2019- 8-20 4.45 0.252
2019- 8-20 20.77 0.252
2019- 8-21 13.09 0.252
2019- 8-22 5.41 0.252
2019- 8-22 21.73 0.252
2019- 8-23 14.05 0.252
2019- 8-24 6.37 0.252
2019- 8-24 22.69 0.252
2019- 8-25 15.01 0.252
2019- 8-26 7.33 0.252
2019- 8-26 23.65 0.252
2019- 8-27 15.97 0.252
2019- 8-28 8.29 0.252
2019- 8-29 0.61 0.252
2019- 8-29 16.93 0.252
2019- 8-30 9.25 0.252
2019- 8-31 1.57 0.252
2019- 8-31 17.89 0.252
2019- 9- 1 10.21 0.252
2019- 9- 2 2.53 0.252
2019- 9- 2 18.85 0.252
2019- 9- 3 11.17 0.252
2019- 9- 4 3.49 0.252
2019- 9- 4 19.81 0.252
2019- 9- 5 12.13 0.252
2019- 9- 6 4.45 0.252
2019- 9- 6 20.77 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2019- 8-19 4.06 0.758
2019- 8-19 20.38 0.758
2019- 8-20 12.70 0.758
2019- 8-21 5.02 0.758
2019- 8-21 21.34 0.758
2019- 8-22 13.66 0.758
2019- 8-23 5.98 0.758
2019- 8-23 22.30 0.758
2019- 8-24 14.62 0.758
2019- 8-25 6.94 0.758
2019- 8-25 23.26 0.758
2019- 8-26 15.58 0.758
2019- 8-27 7.90 0.758
2019- 8-28 0.22 0.758
2019- 8-28 16.54 0.758
2019- 8-29 8.86 0.758
2019- 8-30 1.18 0.758
2019- 8-30 17.50 0.758
2019- 8-31 9.82 0.758
2019- 9- 1 2.14 0.758
2019- 9- 1 18.46 0.758
2019- 9- 2 10.78 0.758
2019- 9- 3 3.10 0.758
2019- 9- 3 19.42 0.758
2019- 9- 4 11.74 0.758
2019- 9- 5 4.06 0.758
2019- 9- 5 20.38 0.758
2019- 9- 6 12.70 0.758

Clear Skies, Petr [2019-08-13 10:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 08/07 for another secondary phase [2019-08-11 23:59, Blue Mountains Obs] Message sent to observers

· observed 08/03 and captured secondary 0.75 [2019-08-03 23:13, Blue Mountains Obs]

· observed 07/22 capturing phase 0.75 [2019-07-26 09:21, Blue Mountains Obs] Message sent to observers

· Started tonight on 7/24 at about 430UT

Russ [2019-07-24 04:23, Shed of Science]

· Covered on 7/21 and 7/22 staring at UT. Sent in data.

Russ [2019-07-23 22:07, Shed of Science] Message sent to observers

· Observing from 21:55 UT tonight. Event expected. Peter K. [2019-07-21 23:40, Ondrejov]

· Took data on this last night. 7/20 starting 4UT.
Russ [2019-07-20 15:36, Shed of Science] Message sent to observers

· This return binary was observed on the first 3 nights in its current 2nd apparition by Kamil Hornoch and Hana Kucakova from here:
http://www.asu.cas.cz/~asteroid/05536_2019a_porb.png
http://www.asu.cas.cz/~asteroid/05536_2019a_p1.png

More data are needed (both for the events and for the primary lc outside events). Errors of 0.01 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 7-11 17.90 0.250
2019- 7-12 10.22 0.250
2019- 7-13 2.55 0.250
2019- 7-13 18.87 0.250
2019- 7-21 6.45 0.250
2019- 7-21 22.77 0.250
2019- 7-22 15.10 0.250
2019- 7-23 7.42 0.250
2019- 7-23 23.75 0.250
2019- 7-24 16.07 0.250
2019- 7-25 8.40 0.250
2019- 7-26 0.72 0.250
2019- 7-26 17.05 0.250
2019- 7-27 9.37 0.250
2019- 7-28 1.70 0.250
2019- 7-28 18.02 0.250
2019- 7-29 10.35 0.250
2019- 7-30 2.67 0.250
2019- 7-30 19.00 0.250
2019- 7-31 11.32 0.250
2019- 8- 1 3.65 0.250
2019- 8- 1 19.97 0.250
2019- 8- 2 12.30 0.250
2019- 8- 3 4.62 0.250
2019- 8- 3 20.95 0.250
2019- 8- 4 13.27 0.250
2019- 8- 5 5.60 0.250
2019- 8- 5 21.92 0.250
2019- 8- 6 14.25 0.250
2019- 8- 7 6.57 0.250
2019- 8- 7 22.90 0.250
2019- 8- 8 15.22 0.250
2019- 8- 9 7.55 0.250
2019- 8- 9 23.87 0.250
2019- 8-10 16.20 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2019- 7-12 2.05 0.750
2019- 7-12 18.38 0.750
2019- 7-13 10.70 0.750
2019- 7-20 22.28 0.750
2019- 7-21 14.60 0.750
2019- 7-22 6.93 0.750
2019- 7-22 23.25 0.750
2019- 7-23 15.58 0.750
2019- 7-24 7.90 0.750
2019- 7-25 0.23 0.750
2019- 7-25 16.55 0.750
2019- 7-26 8.88 0.750
2019- 7-27 1.20 0.750
2019- 7-27 17.53 0.750
2019- 7-28 9.85 0.750
2019- 7-29 2.18 0.750
2019- 7-29 18.50 0.750
2019- 7-30 10.83 0.750
2019- 7-31 3.15 0.750
2019- 7-31 19.48 0.750
2019- 8- 1 11.80 0.750
2019- 8- 2 4.13 0.750
2019- 8- 2 20.45 0.750
2019- 8- 3 12.78 0.750
2019- 8- 4 5.10 0.750
2019- 8- 4 21.43 0.750
2019- 8- 5 13.75 0.750
2019- 8- 6 6.08 0.750
2019- 8- 6 22.40 0.750
2019- 8- 7 14.73 0.750
2019- 8- 8 7.05 0.750
2019- 8- 8 23.38 0.750
2019- 8- 9 15.70 0.750
2019- 8-10 8.03 0.750
2019- 8-11 0.35 0.750

Clear Skies, Petr [2019-07-11 10:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one from 22:18 UT. Best wishes, Kamil [2019-07-10 22:21, Ondrejov] Message sent to observers

· Started this one from 23 UT. Best wishes, Kamil [2019-07-03 23:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Discovery apparition done. [2017-01-10 11:17, Ondrejov]

· Fred Vachier observed this one well in the past lunation:
http://www.asu.cas.cz/~asteroid/05536_2016c_porb.png
http://www.asu.cas.cz/~asteroid/05536_2016c_p1.png
http://www.asu.cas.cz/~asteroid/05536_2016b_porb.png
http://www.asu.cas.cz/~asteroid/05536_2016b_p1.png
http://www.asu.cas.cz/~asteroid/05536_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05536_2016a_p1.png

Last data for this discovery apparition would be useful for future modeling. Errors <= 0.03 mag are needed. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 14.95 0.232
2016-12-18 7.28 0.232
2016-12-18 23.60 0.232
2016-12-19 15.93 0.232
2016-12-20 8.25 0.232
2016-12-21 0.58 0.232
2016-12-21 16.90 0.232
2016-12-22 9.23 0.232
2016-12-23 1.55 0.232
2016-12-23 17.88 0.232
2016-12-24 10.20 0.232
2016-12-25 2.53 0.232
2016-12-25 18.85 0.232
2016-12-26 11.18 0.232
2016-12-27 3.50 0.232
2016-12-27 19.83 0.232
2016-12-28 12.15 0.232
2016-12-29 4.48 0.232
2016-12-29 20.80 0.232
2016-12-30 13.13 0.232
2016-12-31 5.45 0.232
2016-12-31 21.78 0.232
2017- 1- 1 14.10 0.232
2017- 1- 2 6.43 0.232
2017- 1- 2 22.75 0.232
2017- 1- 3 15.08 0.232

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 6.77 0.730
2016-12-17 23.09 0.730
2016-12-18 15.42 0.730
2016-12-19 7.74 0.730
2016-12-20 0.07 0.730
2016-12-20 16.39 0.730
2016-12-21 8.72 0.730
2016-12-22 1.04 0.730
2016-12-22 17.37 0.730
2016-12-23 9.69 0.730
2016-12-24 2.02 0.730
2016-12-24 18.34 0.730
2016-12-25 10.67 0.730
2016-12-26 2.99 0.730
2016-12-26 19.32 0.730
2016-12-27 11.64 0.730
2016-12-28 3.97 0.730
2016-12-28 20.29 0.730
2016-12-29 12.62 0.730
2016-12-30 4.94 0.730
2016-12-30 21.27 0.730
2016-12-31 13.59 0.730
2017- 1- 1 5.92 0.730
2017- 1- 1 22.24 0.730
2017- 1- 2 14.57 0.730
2017- 1- 3 6.89 0.730
2017- 1- 3 23.22 0.730

Clear Skies, Petr [2016-12-09 12:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one was observed by Nelya Gaftonyuk from Simeiz and by Amadeo Aznar in the past lunation. Our data:
http://www.asu.cas.cz/~asteroid/05536_2016b_porb.png
http://www.asu.cas.cz/~asteroid/05536_2016b_p1.png
http://www.asu.cas.cz/~asteroid/05536_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05536_2016a_p1.png

Monitoring event evolution would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 9.14 0.241
2016-11-19 1.46 0.241
2016-11-19 17.79 0.241
2016-11-20 10.11 0.241
2016-11-21 2.44 0.241
2016-11-21 18.76 0.241
2016-11-22 11.09 0.241
2016-11-23 3.41 0.241
2016-11-23 19.74 0.241
2016-11-24 12.06 0.241
2016-11-25 4.39 0.241
2016-11-25 20.71 0.241
2016-11-26 13.04 0.241
2016-11-27 5.36 0.241
2016-11-27 21.69 0.241
2016-11-28 14.01 0.241
2016-11-29 6.34 0.241
2016-11-29 22.66 0.241
2016-11-30 14.99 0.241
2016-12- 1 7.31 0.241
2016-12- 1 23.64 0.241
2016-12- 2 15.96 0.241
2016-12- 3 8.29 0.241
2016-12- 4 0.61 0.241
2016-12- 4 16.94 0.241
2016-12- 5 9.26 0.241
2016-12- 6 1.59 0.241
2016-12- 6 17.91 0.241
2016-12- 7 10.24 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 0.74 0.727
2016-11-18 17.07 0.727
2016-11-19 9.39 0.727
2016-11-20 1.72 0.727
2016-11-20 18.04 0.727
2016-11-21 10.37 0.727
2016-11-22 2.69 0.727
2016-11-22 19.02 0.727
2016-11-23 11.34 0.727
2016-11-24 3.67 0.727
2016-11-24 19.99 0.727
2016-11-25 12.32 0.727
2016-11-26 4.64 0.727
2016-11-26 20.97 0.727
2016-11-27 13.29 0.727
2016-11-28 5.62 0.727
2016-11-28 21.94 0.727
2016-11-29 14.27 0.727
2016-11-30 6.59 0.727
2016-11-30 22.92 0.727
2016-12- 1 15.24 0.727
2016-12- 2 7.57 0.727
2016-12- 2 23.89 0.727
2016-12- 3 16.22 0.727
2016-12- 4 8.54 0.727
2016-12- 5 0.87 0.727
2016-12- 5 17.19 0.727
2016-12- 6 9.52 0.727
2016-12- 7 1.84 0.727

Clear Skies, Petr [2016-11-10 18:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting session at 19:40 UT [2016-11-07 19:39, IAO-Isaac Aznar Obs.] Message sent to observers

· Start to observe 5536 Honycutt tonight at 18.00h [2016-10-29 22:31, IAO-Isaac Aznar Obs.]

· Drive problems caused missed event tonight. Joe [2016-10-26 04:21, Dark Sky & PROMPT] Message sent to observers

· Monitoring evolution of the events in this one would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-19 10.69 0.233
2016-10-20 3.02 0.233
2016-10-20 19.34 0.233
2016-10-21 11.67 0.233
2016-10-22 3.99 0.233
2016-10-22 20.32 0.233
2016-10-23 12.64 0.233
2016-10-24 4.97 0.233
2016-10-24 21.29 0.233
2016-10-25 13.62 0.233
2016-10-26 5.94 0.233
2016-10-26 22.27 0.233
2016-10-27 14.59 0.233
2016-10-28 6.92 0.233
2016-10-28 23.24 0.233
2016-10-29 15.57 0.233
2016-10-30 7.89 0.233
2016-10-31 0.22 0.233
2016-10-31 16.54 0.233
2016-11- 1 8.87 0.233
2016-11- 2 1.19 0.233
2016-11- 2 17.52 0.233
2016-11- 3 9.84 0.233
2016-11- 4 2.17 0.233
2016-11- 4 18.49 0.233
2016-11- 5 10.82 0.233
2016-11- 6 3.14 0.233
2016-11- 6 19.47 0.233
2016-11- 7 11.79 0.233
2016-11- 8 4.12 0.233
2016-11- 8 20.44 0.233
2016-11- 9 12.77 0.233

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-19 2.76 0.747
2016-10-19 19.09 0.747
2016-10-20 11.41 0.747
2016-10-21 3.74 0.747
2016-10-21 20.06 0.747
2016-10-22 12.39 0.747
2016-10-23 4.71 0.747
2016-10-23 21.04 0.747
2016-10-24 13.36 0.747
2016-10-25 5.69 0.747
2016-10-25 22.01 0.747
2016-10-26 14.34 0.747
2016-10-27 6.66 0.747
2016-10-27 22.99 0.747
2016-10-28 15.31 0.747
2016-10-29 7.64 0.747
2016-10-29 23.96 0.747
2016-10-30 16.29 0.747
2016-10-31 8.61 0.747
2016-11- 1 0.94 0.747
2016-11- 1 17.26 0.747
2016-11- 2 9.59 0.747
2016-11- 3 1.91 0.747
2016-11- 3 18.24 0.747
2016-11- 4 10.56 0.747
2016-11- 5 2.89 0.747
2016-11- 5 19.21 0.747
2016-11- 6 11.54 0.747
2016-11- 7 3.86 0.747
2016-11- 7 20.19 0.747
2016-11- 8 12.51 0.747
2016-11- 9 4.84 0.747
2016-11- 9 21.16 0.747

Clear Skies, Petr [2016-10-13 07:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement on this one has appeared on CBET 4326, copied below for your convenience.

Cheers, Petr

(5536) HONEYCUTT
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; A. Aznar, Isaac Aznar Observatory, Centro Astronomico del
Alto Turia, Aras de los Olmos, Spain; A. Marchini, R. Papini, and F.
Salvaggio, Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente,
University of Siena; D. Pray, Sugarloaf Mountain Observatory, South Deerfield,
MA, U.S.A.; and R. Montaigut and A. Leroy, OPERA Observatory, France, report
that photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.35-m telescope at the Isaac Aznar Observatory, a
0.30-m telescope at the Astronomical Observatory of the University of Siena, a
0.50-m telescope at the Sugarloaf Mountain Observatory, and a 0.20-m telescope
at the OPERA Observatory during 2016 Sept. 13-29 reveal that minor planet
(5536) is a binary system with an orbital period of 16.325 Â± 0.005 hr. The
primary shows a period of 3.5830 Â± 0.0002 hr and has a lightcurve amplitude
of 0.09 mag at solar phases 11-18 degrees, suggesting a nearly spheroidal
shape. Mutual eclipse/occultation events that are 0.10- to 0.19-magnitude
deep indicate a secondary-to-primary mean-diameter ratio of 0.31 Â± 0.02.

2016 October 1 (CBET 4326) Daniel W. E. Green [2016-10-02 13:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have already got a good solution for this one:
http://www.asu.cas.cz/~asteroid/05536_porb.png
http://www.asu.cas.cz/~asteroid/05536_p1.png
Preparing discovery announcement for CBET.

Monitoring evolution of the events would be useful (one coverage of each of the two events sometimes later during the lunation will suffice). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-29 17.30 0.235
2016- 9-30 9.63 0.235
2016-10- 1 1.95 0.235
2016-10- 1 18.28 0.235
2016-10- 2 10.60 0.235
2016-10- 3 2.93 0.235
2016-10- 3 19.25 0.235
2016-10- 4 11.58 0.235
2016-10- 5 3.90 0.235
2016-10- 5 20.23 0.235
2016-10- 6 12.55 0.235
2016-10- 7 4.88 0.235
2016-10- 7 21.20 0.235
2016-10- 8 13.53 0.235
2016-10- 9 5.85 0.235
2016-10- 9 22.18 0.235
2016-10-10 14.50 0.235
2016-10-11 6.83 0.235
2016-10-11 23.15 0.235
2016-10-12 15.48 0.235

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-29 9.37 0.749
2016- 9-30 1.69 0.749
2016- 9-30 18.02 0.749
2016-10- 1 10.34 0.749
2016-10- 2 2.67 0.749
2016-10- 2 18.99 0.749
2016-10- 3 11.32 0.749
2016-10- 4 3.64 0.749
2016-10- 4 19.97 0.749
2016-10- 5 12.29 0.749
2016-10- 6 4.62 0.749
2016-10- 6 20.94 0.749
2016-10- 7 13.27 0.749
2016-10- 8 5.59 0.749
2016-10- 8 21.92 0.749
2016-10- 9 14.24 0.749
2016-10-10 6.57 0.749
2016-10-10 22.89 0.749
2016-10-11 15.22 0.749
2016-10-12 7.54 0.749
2016-10-12 23.87 0.749

Clear Skies, Petr [2016-09-29 07:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Good weather. Starting session at 21:50. [2016-09-28 21:53, IAO-Isaac Aznar Obs.] Message sent to observers

· We observed this target from 20.00 to 3.00 UT. [2016-09-28 07:45, Univ-Siena IT] Message sent to BinAstPhotSurvey conference

· I have started one work session at 00:20 UT, 28 Sept. [2016-09-28 00:22, IAO-Isaac Aznar Obs.] Message sent to observers

· I plan to start this one at 01:25, Sep 28 UT.
Don [2016-09-27 23:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot on two nights. It's a binary candidate; a tentative decomposition:
http://www.asu.cas.cz/~asteroid/05536_p1.png
http://www.asu.cas.cz/~asteroid/05536_porb.png
(The orbital period is not unique at all, there are a few other possible values.)

Amadeo Aznar took an early short run two weeks ago. Due to its short duration, it was not clear what was in the data, but now it seems that it also covered an event, see it tentatively joined with Vladimir's data:
http://www.asu.cas.cz/~asteroid/05536_porb_a.png

More data (at any time/orbital phase) are needed to confirm the binary and to establish its period. I encourage others here to help out Vladimir.

Clear Skies, Petr [2016-09-27 11:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another session on this target was obtained on Sep. 26-27, 19:26-02:56 UT.

Vladimir [2016-09-27 10:16, Sopot AO]

· I obtained a session on this new target on Sep. 23-24, 19:19-02:58 UT.

Vladimir [2016-09-24 13:59, Sopot AO] Message sent to BinAstPhotSurvey conference

(58285) 1993 YN (Finished) - slow rotator [Add new note]
· Vladimir Benishek observed this new target from Sopot, found it to be a slow rotator. Following solution is with allowing the nightly magnitude zero points of the individual session to adjust by several hundreds of magnitude:
http://www.asu.cas.cz/~asteroid/58285.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-09-10 10:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on July 24-25 (20:00-01:48 UT).
Vladimir [2019-07-25 14:04, Sopot AO]

(23297) 2001 AX3 (Finished) - slow rotator [Add new note]
· Vladimir Benishek observed this new target from Sopot, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/23297.png
It is actually a tumbler.
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-09-10 09:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed on July 10-11 (22:07-01:25 UT) and July 24-25 (21:56-01:33 UT).
Vladimir [2019-07-25 14:00, Sopot AO]

(7395) 1985 RP1 (Finished) - slow rotator [Add new note]
· Julian Oey observed this new target from Leura, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/07395.png
It is actually a tumbler.
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-09-10 09:00, Ondrejov] Message sent to BinAstPhotSurvey conference

(5949) 1985 RL3 (Finished) [Add new note]
· Julian Oey observed this "prime suspect" from Leura: Good solution, no significant deviation.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Target closed.

Petr [2019-09-10 08:41, Ondrejov]

· observed on 09/01, 09/02, 09/03, 09/04, 09/05 [2019-09-06 11:50, Blue Mountains Obs] Message sent to observers

· observed 08/31 [2019-09-01 01:06, Blue Mountains Obs]

· start to observe 08/22, 08/23, 08/24 [2019-08-25 21:17, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Don Pray has done this new target from Sugarloaf Mountain on four nights: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/05949.png
Target done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Cheers, Petr [2015-05-10 12:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start a second run on this at 01:30 UT.
Don [2015-04-29 01:06, Sugarloaf]

· Starting observations at 4:00 UTC. Will be observing till 9:30 UTC. [2015-04-25 03:59, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

(5663) McKeegan (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05663.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-09-09 10:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night (Sep. 01-02, 20:12-01:05 UT).
Vladimir [2019-09-02 13:24, Sopot AO]

(141808) 2002 NV38 (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Reasonable solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/141808.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-09-09 09:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one last night (Sep. 01-02, 20:20-02:12 UT).
Vladimir [2019-09-02 13:28, Sopot AO]

(4912) Emilhaury (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04912.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Vladimir.

Petr [2019-09-09 09:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this new target on Aug. 28-29 (20:03-01:58 UT) and Aug. 29-30 (20:22-01:26 UT).
Vladimir [2019-08-30 13:15, Sopot AO]

(8356) Wadhwa (Finished) [Add new note]
· This "prime suspect" (i.e., asteroid with P and A in the range typical for binaries, but without actual signs for binarity seen yet) was observed extensively by Julian Oey from Leura: Good solution, excellent coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/08356_b9.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-08-15 14:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 08/05,08/06,08/07 during clear nights about 8 hours per session [2019-08-08 10:50, Blue Mountains Obs] Message sent to observers

· observed on 07/28 and 08/03 with duration of 6 and 5 hours respectively. [2019-08-03 22:34, Blue Mountains Obs]

· start this new target 07/22, 07/24 [2019-07-27 02:42, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This one has been established with two long nights by Peter K. from Ondrejov and with one night by Michal and Marek from Skalnate Pleso: Good solution and coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/08356.png
Deviations in a few sessions taken from two other stations have been found to be related to observational problems.
It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Peter, Michal and Marek.

Cheers, Petr [2008-12-15 09:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· some deviation observed in the early portion of the session
crowded star field makes measurement challanging [2008-10-25 13:20, Via Capote] Message sent to observers

· Peter K. has taken two full nights (10.6-h long) from here. The data fit well with the 3.044-h period found by Richard, no deviation seen. Richard has identified a likely observational cause for the deviations he saw; now he is working on eliminating the problem. The asteroid appears single-periodic and no more data are currently needed,
http://www.asu.cas.cz/~asteroid/08356.png

Cheers, Petr [2008-10-24 09:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 10.6 hours last night and continuing tonight (from 17:35 UT). Peter K. [2008-10-18 20:05, Ondrejov] Message sent to observers

· Observing from 17:30 UT but conditions are not so good as I expected. Peter K. [2008-10-17 18:37, Ondrejov]

· Richard's data for the binary candidate give a good estimate for the short period:
P_1 = 3.044 +/- 0.001 h
but the second period needs to be nailed down - the deconvolved data in the 3rd plot below are for one of possible periods, 32.5 h; the solution is also sensitive on accuracy of Richard's calibrations.
http://www.asu.cas.cz/~asteroid/08356_all.png
http://www.asu.cas.cz/~asteroid/08356_p1.png
http://www.asu.cas.cz/~asteroid/08356_p2.png

No obvious mutual events there so far. If the second period is secondary's rotation, then we may not see the system in events geometry currently. In any case, more data (long or linked/calibrated sessions) are needed to establish the second period.

Clear Skies, Petr [2008-10-15 19:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· 8356 Wadwha appears to be an unusual object. Analysis of Oct 7 (8.1 hrs run) and Oct 8 (10.4 hrs run) data reveals a principal rotation period of 3.05 +/- 0.02 hr with amplitude of 0.15 mag. However, the rotational lightcurve is superimposed on a slowly varying background of amplitude 0.12 mag. The time-scale of the background variation is of the order of 24-36 hr assuming two max-min per rotation. Further observations are encouraged - opposition is reached on October 22, i.e. one week after full moon. [2008-10-13 21:22, Golden Hill Obs.] Message sent to BinAstPhotSurvey conference

· Started at 1840 UT, 6.5 hrs completed. First observing run last night (Oct 7-8) continued for 8.0 hrs with very good conditions towards dawn. Rotation period = 3.13 +/-0.10 hr from separation of two maxima. [2008-10-09 00:57, Golden Hill Obs.] Message sent to observers

· Started at 2112 UT. Now 4.5 hours into session but condensation is causing some problems. Also fairly crowded field. Another 3 hours theoretically possible. [2008-10-08 01:47, Golden Hill Obs.] Message sent to BinAstPhotSurvey conference

(2131) Mayall (Finished) - return binary [Add new note]
· Done for the 5th apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-08-15 08:39, Ondrejov]

· Starting this at 02:10 UT.
Don [2019-08-06 01:15, Sugarloaf] Message sent to observers

· Observed this on Aug 5 UT.
Don [2019-08-05 18:44, Sugarloaf]

· Observed this one on 31 July from 19:00 to 22:50 UT. Vasilij Ch. [2019-08-01 00:13, Kharkiv] Message sent to observers

· Did a run on this on July 28 UT.
Don [2019-07-30 23:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for this apparition. Petr [2018-03-28 09:10, Ondrejov]

· Our data for this one in the current apparition so far:
http://www.asu.cas.cz/~asteroid/02131_2017d_porb.png
http://www.asu.cas.cz/~asteroid/02131_2017d_p1.png
http://www.asu.cas.cz/~asteroid/02131_2017c_porb.png
http://www.asu.cas.cz/~asteroid/02131_2017c_p1.png
http://www.asu.cas.cz/~asteroid/02131_2017b_porb.png
http://www.asu.cas.cz/~asteroid/02131_2017b_p1.png
http://www.asu.cas.cz/~asteroid/02131_2017a_porb.png
http://www.asu.cas.cz/~asteroid/02131_2017a_p1.png

Last data (for this apparition) with errors of 0.01 mag and full event coverage (plus 3 hours outside events for the primary lc component) would be useful to take twice in March (but don't bother in less ideal conditions). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 3- 5 5.69 0.236
2018- 3- 6 5.17 0.236
2018- 3- 7 4.65 0.236
2018- 3- 8 4.13 0.236
2018- 3- 9 3.61 0.236
2018- 3-10 3.09 0.236
2018- 3-11 2.57 0.236
2018- 3-12 2.05 0.236
2018- 3-13 1.53 0.236
2018- 3-14 1.01 0.236
2018- 3-15 0.49 0.236
2018- 3-15 23.97 0.236
2018- 3-16 23.45 0.236
2018- 3-17 22.93 0.236
2018- 3-18 22.41 0.236
2018- 3-19 21.89 0.236
2018- 3-20 21.37 0.236
2018- 3-21 20.85 0.236
2018- 3-22 20.33 0.236
2018- 3-23 19.81 0.236

Date/Time UTC (LTc.) Phase
--------------------------
2018- 3- 5 17.44 0.736
2018- 3- 6 16.92 0.736
2018- 3- 7 16.40 0.736
2018- 3- 8 15.88 0.736
2018- 3- 9 15.36 0.736
2018- 3-10 14.84 0.736
2018- 3-11 14.32 0.736
2018- 3-12 13.80 0.736
2018- 3-13 13.28 0.736
2018- 3-14 12.76 0.736
2018- 3-15 12.24 0.736
2018- 3-16 11.72 0.736
2018- 3-17 11.20 0.736
2018- 3-18 10.68 0.736
2018- 3-19 10.16 0.736
2018- 3-20 9.64 0.736
2018- 3-21 9.12 0.736
2018- 3-22 8.60 0.736
2018- 3-23 8.08 0.736

Clear Skies, Petr [2018-02-26 08:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Feb. 09 (17:09-22:26 UT).
Vladimir [2018-02-10 11:21, Sopot AO]

· Last data (for this apparition) with errors of 0.01 mag and full event coverage (plus 3 hours outside events for the primary lc component) would be useful to take twice in this month (but don't bother in less ideal conditions). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 2- 3 21.27 0.235
2018- 2- 4 20.75 0.235
2018- 2- 5 20.23 0.235
2018- 2- 6 19.71 0.235
2018- 2- 7 19.19 0.235
2018- 2- 8 18.67 0.235
2018- 2- 9 18.15 0.235
2018- 2-10 17.63 0.235
2018- 2-11 17.11 0.235
2018- 2-12 16.59 0.235
2018- 2-13 16.07 0.235
2018- 2-14 15.55 0.235
2018- 2-15 15.03 0.235
2018- 2-16 14.51 0.235
2018- 2-17 13.99 0.235
2018- 2-18 13.47 0.235
2018- 2-19 12.95 0.235
2018- 2-20 12.43 0.235
2018- 2-21 11.91 0.235
2018- 2-22 11.39 0.235
2018- 2-23 10.87 0.235

Date/Time UTC (LTc.) Phase
--------------------------
2018- 2- 4 9.02 0.735
2018- 2- 5 8.50 0.735
2018- 2- 6 7.98 0.735
2018- 2- 7 7.46 0.735
2018- 2- 8 6.94 0.735
2018- 2- 9 6.42 0.735
2018- 2-10 5.90 0.735
2018- 2-11 5.38 0.735
2018- 2-12 4.86 0.735
2018- 2-13 4.34 0.735
2018- 2-14 3.82 0.735
2018- 2-15 3.30 0.735
2018- 2-16 2.78 0.735
2018- 2-17 2.26 0.735
2018- 2-18 1.74 0.735
2018- 2-19 1.22 0.735
2018- 2-20 0.70 0.735
2018- 2-21 0.18 0.735
2018- 2-21 23.66 0.735
2018- 2-22 23.14 0.735
2018- 2-23 22.62 0.735

Clear Skies, Petr [2018-02-01 11:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 01:00 UT to catch the 0.255 event at 2.43 UT.
Don [2018-01-26 00:31, Sugarloaf] Message sent to observers

· Don Pray took first data for this return binary in its current apparition:
http://www.asu.cas.cz/~asteroid/02131_2017a_porb.png
http://www.asu.cas.cz/~asteroid/02131_2017a_p1.png

More data with errors of 0.01 mag and full event coverage (plus 3 hours outside events for the primary lc component) would be useful to take twice in this month (but don't bother in less ideal conditions). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 1- 7 12.31 0.255
2018- 1- 8 11.79 0.255
2018- 1- 9 11.27 0.255
2018- 1-10 10.75 0.255
2018- 1-11 10.23 0.255
2018- 1-12 9.71 0.255
2018- 1-13 9.19 0.255
2018- 1-14 8.67 0.255
2018- 1-15 8.15 0.255
2018- 1-16 7.63 0.255
2018- 1-17 7.11 0.255
2018- 1-18 6.59 0.255
2018- 1-19 6.07 0.255
2018- 1-20 5.55 0.255
2018- 1-21 5.03 0.255
2018- 1-22 4.51 0.255
2018- 1-23 3.99 0.255
2018- 1-24 3.47 0.255
2018- 1-25 2.95 0.255
2018- 1-26 2.43 0.255
2018- 1-27 1.91 0.255
2018- 1-28 1.39 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2018- 1- 7 0.56 0.755
2018- 1- 8 0.04 0.755
2018- 1- 8 23.52 0.755
2018- 1- 9 23.00 0.755
2018- 1-10 22.48 0.755
2018- 1-11 21.96 0.755
2018- 1-12 21.44 0.755
2018- 1-13 20.92 0.755
2018- 1-14 20.40 0.755
2018- 1-15 19.88 0.755
2018- 1-16 19.36 0.755
2018- 1-17 18.84 0.755
2018- 1-18 18.32 0.755
2018- 1-19 17.80 0.755
2018- 1-20 17.28 0.755
2018- 1-21 16.76 0.755
2018- 1-22 16.24 0.755
2018- 1-23 15.72 0.755
2018- 1-24 15.20 0.755
2018- 1-25 14.68 0.755
2018- 1-26 14.16 0.755
2018- 1-27 13.64 0.755

Clear Skies, Petr [2018-01-03 08:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this return binary on Dec 27.
Don [2017-12-27 20:05, Sugarloaf]

· Data taken for this return binary in its current 3rd apparition so far: 4 nights by Joe Pollock with Prompt,
http://www.asu.cas.cz/~asteroid/02131_13c_porb.png
http://www.asu.cas.cz/~asteroid/02131_13c_p1.png
http://www.asu.cas.cz/~asteroid/02131_13b_porb.png
http://www.asu.cas.cz/~asteroid/02131_13b_p1.png
http://www.asu.cas.cz/~asteroid/02131_13a_porb.png
http://www.asu.cas.cz/~asteroid/02131_13a_p1.png
(The data in the porb plots are folded with half of the orbital period.)

More data before this apparition ends are needed (errors <0.02 mag); events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3-30 14.89 0.241
2013- 3-31 14.36 0.241
2013- 4- 1 13.83 0.241
2013- 4- 2 13.30 0.241
2013- 4- 3 12.77 0.241
2013- 4- 4 12.24 0.241
2013- 4- 5 11.71 0.241
2013- 4- 6 11.18 0.241
2013- 4- 7 10.65 0.241
2013- 4- 8 10.12 0.241
2013- 4- 9 9.59 0.241
2013- 4-10 9.06 0.241
2013- 4-11 8.53 0.241
2013- 4-12 8.00 0.241
2013- 4-13 7.47 0.241
2013- 4-14 6.94 0.241
2013- 4-15 6.41 0.241
2013- 4-16 5.88 0.241
2013- 4-17 5.35 0.241
2013- 4-18 4.82 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3-31 2.61 0.741
2013- 4- 1 2.08 0.741
2013- 4- 2 1.55 0.741
2013- 4- 3 1.02 0.741
2013- 4- 4 0.49 0.741
2013- 4- 4 23.96 0.741
2013- 4- 5 23.43 0.741
2013- 4- 6 22.90 0.741
2013- 4- 7 22.37 0.741
2013- 4- 8 21.84 0.741
2013- 4- 9 21.31 0.741
2013- 4-10 20.78 0.741
2013- 4-11 20.25 0.741
2013- 4-12 19.72 0.741
2013- 4-13 19.19 0.741
2013- 4-14 18.66 0.741
2013- 4-15 18.13 0.741
2013- 4-16 17.60 0.741
2013- 4-17 17.07 0.741
2013- 4-18 16.54 0.741

Clear Skies, Petr [2013-03-25 07:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt ~0015 UT under good conditions. Hope to cover primary event centered at 0228 UT. Joe [2013-03-09 02:31, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt ~0015 UT under good conditions. Hope to cover primary event centered at 0539 UT. Joe [2013-03-03 00:16, Dark Sky & PROMPT]

· Data taken for this return binary in its current 3rd apparition so far: 3 nights by Joe Pollock with Prompt,
http://www.asu.cas.cz/~asteroid/02131_13a_porb.png
http://www.asu.cas.cz/~asteroid/02131_13a_p1.png
http://www.asu.cas.cz/~asteroid/02131_13b_porb.png
http://www.asu.cas.cz/~asteroid/02131_13b_p1.png
(The data in the porb plots are folded with half of the orbital period.)

More data are needed for its modeling; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 3- 1 6.71 0.250
2013- 3- 2 6.18 0.250
2013- 3- 3 5.65 0.250
2013- 3- 4 5.12 0.250
2013- 3- 5 4.59 0.250
2013- 3- 6 4.06 0.250
2013- 3- 7 3.53 0.250
2013- 3- 8 3.00 0.250
2013- 3- 9 2.47 0.250
2013- 3-10 1.94 0.250
2013- 3-11 1.41 0.250
2013- 3-12 0.88 0.250
2013- 3-13 0.35 0.250
2013- 3-13 23.82 0.250
2013- 3-14 23.29 0.250
2013- 3-15 22.76 0.250
2013- 3-16 22.23 0.250
2013- 3-17 21.70 0.250
2013- 3-18 21.17 0.250
2013- 3-19 20.64 0.250
2013- 3-20 20.11 0.250
2013- 3-21 19.58 0.250
2013- 3-22 19.05 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2013- 2-28 18.91 0.748
2013- 3- 1 18.38 0.748
2013- 3- 2 17.85 0.748
2013- 3- 3 17.32 0.748
2013- 3- 4 16.79 0.748
2013- 3- 5 16.26 0.748
2013- 3- 6 15.73 0.748
2013- 3- 7 15.20 0.748
2013- 3- 8 14.67 0.748
2013- 3- 9 14.14 0.748
2013- 3-10 13.61 0.748
2013- 3-11 13.08 0.748
2013- 3-12 12.55 0.748
2013- 3-13 12.02 0.748
2013- 3-14 11.49 0.748
2013- 3-15 10.96 0.748
2013- 3-16 10.43 0.748
2013- 3-17 9.90 0.748
2013- 3-18 9.37 0.748
2013- 3-19 8.84 0.748
2013- 3-20 8.31 0.748
2013- 3-21 7.78 0.748
2013- 3-22 7.25 0.748

Clear Skies, Petr [2013-02-26 07:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt ~0130 UT under good conditions. Hope to cover secondary event centered at 0448 UT. Joe [2013-02-11 03:04, Dark Sky & PROMPT] Message sent to observers

· Very good data, Joe, especially from the first night (the 2nd night's data are more affected by the brighter and closer Moon, especially a few first tens points at the beginning that were taken at high airmass).
http://www.asu.cas.cz/~asteroid/02131_13_p1.png
http://www.asu.cas.cz/~asteroid/02131_13_porb.png
(I have folded them with P_orb/2 there for now.)

More data are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 1-31 22.34 0.249
2013- 2- 1 21.81 0.249
2013- 2- 2 21.28 0.249
2013- 2- 3 20.75 0.249
2013- 2- 4 20.22 0.249
2013- 2- 5 19.69 0.249
2013- 2- 6 19.16 0.249
2013- 2- 7 18.63 0.249
2013- 2- 8 18.10 0.249
2013- 2- 9 17.57 0.249
2013- 2-10 17.04 0.249
2013- 2-11 16.51 0.249
2013- 2-12 15.98 0.249
2013- 2-13 15.45 0.249
2013- 2-14 14.92 0.249
2013- 2-15 14.39 0.249
2013- 2-16 13.86 0.249
2013- 2-17 13.33 0.249
2013- 2-18 12.80 0.249
2013- 2-19 12.27 0.249
2013- 2-20 11.74 0.249
2013- 2-21 11.21 0.249
2013- 2-22 10.68 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2013- 2- 1 10.09 0.750
2013- 2- 2 9.56 0.750
2013- 2- 3 9.03 0.750
2013- 2- 4 8.50 0.750
2013- 2- 5 7.97 0.750
2013- 2- 6 7.44 0.750
2013- 2- 7 6.91 0.750
2013- 2- 8 6.38 0.750
2013- 2- 9 5.85 0.750
2013- 2-10 5.32 0.750
2013- 2-11 4.79 0.750
2013- 2-12 4.26 0.750
2013- 2-13 3.73 0.750
2013- 2-14 3.20 0.750
2013- 2-15 2.67 0.750
2013- 2-16 2.14 0.750
2013- 2-17 1.61 0.750
2013- 2-18 1.08 0.750
2013- 2-19 0.55 0.750
2013- 2-20 0.02 0.750
2013- 2-20 23.49 0.750
2013- 2-21 22.96 0.750
2013- 2-22 22.43 0.750

Clear Skies, Petr [2013-01-28 09:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt ~0200 UT under good conditions. Hope to get about 7 hours. Joe [2013-01-26 03:42, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt ~0100 UT under good conditions. Hope to get about 8 hours. Joe [2013-01-25 02:25, Dark Sky & PROMPT]

· This return binary is deeply in the Milky Way now and we cannot take more useful data, so we close it for this return apparition. A limited solution (with P_orb set at the estimated value from the discovery apparition):
http://www.asu.cas.cz/~asteroid/02131_11_porb.png
http://www.asu.cas.cz/~asteroid/02131_11_p1.png

Despite the limited data, they should be useful when we get a good thorough observations in a future apparition.

Cheers, Petr [2011-08-23 07:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target 20110727 in good conditions but the starfield was too dense to extract any useful data. [2011-07-27 23:06, HuntersHill] Message sent to observers

· Began observing from Prompt at 2258 UT under excellent conditions. Can observe until about 1030 UT. Will get end of secondary event and beginning of primary event according to David. Will cover four plus rotations. Joe [2011-06-30 03:04, Dark Sky & PROMPT] Message sent to observers

· Observed 2011-06-27 in reasonabel conditions. One event has now been covered on all 3 nights. Data sent to Peter. [2011-06-29 00:01, HuntersHill]

· I just realised that with P_Orb = 23.5h, I am not going to see the 2nd event and will need assistance from someone on the other side of the world. [2011-06-27 02:27, HuntersHill] Message sent to observers

· Returning Binary. Observed 2011-06-25 and 26 in reasonable conditions. Data is soemwhat noisey possibly due to the number of star subtractions required (more than a dozen each session). Data sent to Peter K for analysis.
Running the data through Canopus' dual period search I see an eclipsing event of ~0.07mag amplitude with P1 = 2.569 +/- 0.003h and P_Orb = 23.5 +/- 0.2h [2011-06-27 00:25, HuntersHill] Message sent to BinAstPhotSurvey conference

· Closed for this discovery apparition. Petr [2010-03-04 12:34, Ondrejov]

· Only limited follow-up observations were taken in the January lunation, by Walt et al. from SRO and by Adrian et al. from Modra:
http://www.asu.cas.cz/~asteroid/02131_10jan_porb.png
http://www.asu.cas.cz/~asteroid/02131_10jan_p1.png

It would be useful to take more observations in February, to prolong the observed arc for future modeling. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 2- 3 1.59 0.250
2010- 2- 4 1.06 0.250
2010- 2- 5 0.53 0.250
2010- 2- 6 0.00 0.250
2010- 2- 6 23.47 0.250
2010- 2- 7 22.94 0.250
2010- 2- 8 22.41 0.250
2010- 2- 9 21.88 0.250
2010- 2-10 21.35 0.250
2010- 2-11 20.82 0.250
2010- 2-12 20.29 0.250
2010- 2-13 19.76 0.250
2010- 2-14 19.23 0.250
2010- 2-15 18.70 0.250
2010- 2-16 18.17 0.250
2010- 2-17 17.64 0.250
2010- 2-18 17.11 0.250
2010- 2-19 16.58 0.250
2010- 2-20 16.05 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 2- 3 13.43 0.755
2010- 2- 4 12.90 0.755
2010- 2- 5 12.37 0.755
2010- 2- 6 11.84 0.755
2010- 2- 7 11.31 0.755
2010- 2- 8 10.78 0.755
2010- 2- 9 10.25 0.755
2010- 2-10 9.72 0.755
2010- 2-11 9.19 0.755
2010- 2-12 8.66 0.755
2010- 2-13 8.13 0.755
2010- 2-14 7.60 0.755
2010- 2-15 7.07 0.755
2010- 2-16 6.54 0.755
2010- 2-17 6.01 0.755
2010- 2-18 5.48 0.755
2010- 2-19 4.95 0.755
2010- 2-20 4.42 0.755

Clear Skies, Petr [2010-01-26 15:16, Ondrejov]

· Working from SRO tonight. -Walt [2010-01-15 01:47, Sonoita] Message sent to observers

· Running from SRO tonight. -Walt [2010-01-06 02:50, Sonoita]

· Follow-up observations would be useful, events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 1- 5 17.40 0.250
2010- 1- 6 16.88 0.250
2010- 1- 7 16.36 0.250
2010- 1- 8 15.84 0.250
2010- 1- 9 15.32 0.250
2010- 1-10 14.80 0.250
2010- 1-11 14.28 0.250
2010- 1-12 13.76 0.250
2010- 1-13 13.24 0.250
2010- 1-14 12.72 0.250
2010- 1-15 12.20 0.250
2010- 1-16 11.68 0.250
2010- 1-17 11.16 0.250
2010- 1-18 10.64 0.250
2010- 1-19 10.12 0.250
2010- 1-20 9.60 0.250
2010- 1-21 9.08 0.250
2010- 1-22 8.56 0.250
2010- 1-23 8.04 0.250
2010- 1-24 7.52 0.250
2010- 1-25 7.00 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 1- 6 5.12 0.750
2010- 1- 7 4.60 0.750
2010- 1- 8 4.08 0.750
2010- 1- 9 3.56 0.750
2010- 1-10 3.04 0.750
2010- 1-11 2.52 0.750
2010- 1-12 2.00 0.750
2010- 1-13 1.48 0.750
2010- 1-14 0.96 0.750
2010- 1-15 0.44 0.750
2010- 1-15 23.92 0.750
2010- 1-16 23.40 0.750
2010- 1-17 22.88 0.750
2010- 1-18 22.36 0.750
2010- 1-19 21.84 0.750
2010- 1-20 21.32 0.750
2010- 1-21 20.80 0.750
2010- 1-22 20.28 0.750
2010- 1-23 19.76 0.750
2010- 1-24 19.24 0.750

Clear Skies, Petr [2010-01-05 10:25, Ondrejov]

· Our announcement on this binary has been published on CBET 2105. I add notes on it to our web pages and copy the text here for your convenience.

Cheers, Petr

(2131) MAYALL
B. Warner, Palmer Divide Observatory; P. Pravec, P. Kusnirak, and
K. Hornoch, Ondrejov Observatory; J. Vilagi, L. Kornos, S. Gajdos, P. Veres,
and A. Galad, Modra Observatory; W. Cooney, J. Gross, and D. Terrell,
Sonoita Research Observatory, Sonoita, AZ; and Yu. Krugly and V. Chiorny,
Kharkiv Observatory, report that photometric observations obtained during
Nov. 30-Dec. 16 reveal that minor planet (2131) is a binary system with an
orbital period of 23.48 ± 0.01 hr. The primary shows a period of 2.5678
± 0.0001 hr and has a lightcurve amplitude of 0.09 mag, suggesting a
nearly spheroidal shape. The secondary rotates synchronously with the
orbital motion, and its lightcurve component has an amplitude of 0.05 mag.
Observed mutual-eclipse/occultation events indicate a secondary-to-primary
mean-diameter ratio of 0.28 ± 0.02.
Observations in 2005 (Warner 2005, Minor Planet Bull. 32, 54-58) and
2007 (Warner et al. 2007, Minor Planet Bull. 34, 23) showed no indications
of (2131) being binary.

2009 December 31 (CBET 2105) Daniel W. E. Green [2010-01-05 10:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will start this one from SRO in a few minutes. -Walt [2009-12-15 02:58, Sonoita] Message sent to observers

· Starting observation, cirrus cover.
Peter Veres [2009-12-14 16:48, Modra]

· Solution for the binary 2131 Mayall is unique except for the size ratio:
P_1 = 2.5678 ± 0.0001 h
P_orb = 23.48 ± 0.01 h
P_2 = P_orb (synchronous secondary)
A_1 = 0.09 mag
A_2 = 0.05 mag
D_2/D_1 >= 0.26 mag
http://www.asu.cas.cz/~asteroid/02131_09_p1.png
http://www.asu.cas.cz/~asteroid/02131_09_porb.png

To establish the size ratio, one or two sessions covering the secondary event is needed, ephemeris follows:

Date/Time UTC (LTc.) Phase
--------------------------
2009-12-14 17.08 0.750
2009-12-15 16.56 0.750
2009-12-16 16.04 0.750
2009-12-17 15.52 0.750
2009-12-18 15.00 0.750
2009-12-19 14.48 0.750
2009-12-20 13.96 0.750
2009-12-21 13.44 0.750
2009-12-22 12.92 0.750
2009-12-23 12.40 0.750

Clear Skies, Petr [2009-12-14 10:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this one from SRO as I type. -Walt [2009-12-11 03:17, Sonoita] Message sent to observers

· Observed from 20:29 to 02:05 UT under variable cirrus cover in the second half of the run.

Stefan [2009-12-06 02:19, Modra]

· Observations from Modra (in combination with Brian's data) revealed that 2131 is a binary asteroid with P_orb near 23.4 h and attenuations 0.04-0.05 mag deep - see updated pictures linked in Brian's note from Dec 1.

More observations, especially covering both events, are required. Here is an ephemeris for your convenience. Good luck!

Date/Time UTC (LTc.) Phase
--------------------------
2009-12- 3 22.73 0.298
2009-12- 4 22.13 0.298
2009-12- 5 21.53 0.298
2009-12- 6 20.93 0.298
2009-12- 7 20.33 0.298
2009-12- 8 19.73 0.298
2009-12- 9 19.13 0.298
2009-12-10 18.53 0.298

Date/Time UTC (LTc.) Phase
--------------------------
2009-12- 3 10.85 0.790
2009-12- 4 10.25 0.790
2009-12- 5 9.65 0.790
2009-12- 6 9.05 0.790
2009-12- 7 8.45 0.790
2009-12- 8 7.85 0.790
2009-12- 9 7.25 0.790
2009-12-10 6.65 0.790

Peter K. [2009-12-04 14:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying to observe again tonight. Jozef, Stefan. [2009-12-03 17:43, Modra]

· We will try to observe this one tonight, however weather is uncertain. Jozef, Leos. [2009-12-02 17:02, Modra]

· This is showing signs of being a fully asynchronous binary. As always, \"More data!\" Here\'s a note from Petr after reviewing the first two nights of data:

Indeed, it is a pretty similar behaviour on both nights. Assuming the overall \"bowing\" in the nights is a secondary rotation lightcurve, it can be fitted with a period near 23 hours (or half, or twice that). The small drops of brightness (by a few 0.01 mag) before the ends of the
sessions are suggestive of being mutual events, but more data are needed to confirm and to establish their period.

http://www.asu.cas.cz/~asteroid/02131_09_p1.png
http://www.asu.cas.cz/~asteroid/02131_09_p2.png

Please send me a copy of your data as well as to Petr.
/Peter. Thanks!

Clear Skies,
Brian D. Warner [2009-12-01 16:54, PalmerDivide] Message sent to BinAstPhotSurvey conference

(306381) 1993 RR2 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/306381.png
Closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-08-13 12:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one on June 12 and did another run on June 23. Could be a slow rotator.

Don [2019-06-23 16:19, Sugarloaf]

(78060) 2002 KS3 (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain, supported with two short sessions by Kamil Hornoch and Hana Kucakova from here.
http://www.asu.cas.cz/~asteroid/78060.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-08-13 12:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 01:30 UT.
Don [2019-07-26 01:27, Sugarloaf]

· I started this one last night, June 28 UT.
Don [2019-06-29 01:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

(68414) 2001 QZ219 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/68414.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don.

Petr [2019-08-13 12:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this on July 27 and 28 UT.
Don [2019-07-29 22:12, Sugarloaf]

(12512) Split (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/12512.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-08-13 11:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this new target on Aug. 5-6, 23:28-02:03 UT.
Vladimir [2019-08-06 16:11, Sopot AO]

(7365) Sejong (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: U = 2 solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07365.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-08-13 11:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this last night, July 25 UT.
Don [2019-07-25 19:33, Sugarloaf]

(6567) Shigemasa (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution, satisfactory coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06567.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Vladimir.

Petr [2019-08-13 11:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 21:30 UT, July 31.
Vladimir [2019-07-31 23:49, Sopot AO]

(32897) Curtharris (Finished) [Add new note]
· Done for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-07-26 11:06, Ondrejov]

· Observed this target at night 24/25 July from 19:20 to 22:40 UT. Vasilij Ch. [2019-07-25 15:18, Kharkiv] Message sent to observers

· Observing this target at night 4/5 July from 19.8 to 23.6 UT.
Vasilij Ch. [2019-07-06 16:35, Kharkiv]

· Did a run on 05 July between 06:35 and 11:19 UT. Data sent to Peter. [2019-07-05 13:30, Santana] Message sent to observers

· Observed on June 29-30 (22:04-00:36 UT) and June 30-July 01 (21:35-01:15 UT).
Vladimir [2019-07-01 11:52, Sopot AO]

· I observed this asteroid on four nights between June 14 and 24. One night has six data points at the start of the run showing a significant deviation. If real, might show an attenuation event. Data will be sent to Peter. [2019-06-29 14:15, Santana] Message sent to observers

· Started a run at 23:32 UT.
Vladimir [2019-06-27 01:00, Sopot AO] Message sent to BinAstPhotSurvey conference

(19126) Ottohahn (Finished) - slow rotator [Add new note]
· We found this one to be a slow rotator. Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-07-25 06:17, Ondrejov]

· Observing from 21:20 UT tonight. Peter K. [2019-07-05 22:15, Ondrejov] Message sent to observers

· I observed this on July 3 and will do so again on July 4, starting at about 01:50 UT.
Don [2019-07-04 01:11, Sugarloaf]

· I will start this one tonight from 20:45 UT. Best wishes, Kamil [2019-07-03 20:32, Ondrejov] Message sent to observers

· Observed for 3,5 hours last night. Peter K. [2019-06-30 10:52, Ondrejov]

· Observed for 4 hours last night. Peter K. [2019-06-27 04:38, Ondrejov]

· Observed this on June 22 and 23.
Don [2019-06-23 01:59, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this one on June 9 UT.
Don [2019-06-09 18:42, Sugarloaf]

(16467) 1990 FD3 (Finished) - slow rotator [Add new note]
· Slow rotator, closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-07-25 06:16, Ondrejov]

· Starting this one tonight July 6, about 3UT.
Russ [2019-07-06 03:20, Shed of Science] Message sent to observers

· I observed this on July 3 and will again on July 4.
Don [2019-07-04 01:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed for 2,6 hours last night. Peter K. [2019-06-30 11:18, Ondrejov] Message sent to observers

· We have observed this new target as a supplementary target here for the second halves of the nights 2019-06-02 to 09 (when our primary target was 1999 KW4 during the first halves of the nights). As they were short sessions with durations between 1.1 and 2.7 h, our solution is far from unique, it may be a period from about 3 hours up to more than 10 hours; a composite lightcurve for one of them:
http://www.asu.cas.cz/~asteroid/16467.png

We plan to take more data for it in the next lunation since June 22, but we will probably need at least one night from a substantially different longitude to obtain a reasonable solution. If some of you Americans could take one night for it with errors < 0.03 mag when the Moon is not a problem, it would be great. Many thanks for your help!

Clear Skies, Petr [2019-06-13 09:07, Ondrejov] Message sent to BinAstPhotSurvey conference

(21627)Sillis (Finished) - slow rotator [Add new note]
· Slow rotator, closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-07-11 10:49, Ondrejov]

· Will take some data on this tonight as well July 6

Russ [2019-07-06 03:21, Shed of Science] Message sent to observers

· I did a short run on this on June 22 and will do another on June 23 UT.
Don [2019-06-23 00:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Russ Durkee observed this new target from Shed of Science South on three nights, found it to be a slow rotator. See following tentative plot to get idea:
http://www.asu.cas.cz/~asteroid/21627.png
However, he cannot take more data for it in the upcoming lunation as he is away, so a take over by someone else in our consortium would be welcome. It could be suitable as a secondary target --- taking a few normal points per night would be sufficient for it.

Clear Skies, Petr [2019-06-17 10:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will start this new target on 5/28 at 3UT.

Russ [2019-05-28 02:51, Shed of Science]

(6205) Menottigalli (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot on 9 nights (session durations 2.7-4.8 h): U = 3- solution, no significant deviation.
http://www.asu.cas.cz/~asteroid/06205.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-07-10 09:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a short run on this on July 8 and should do a longer run tonight (July 9).
Don [2019-07-09 01:51, Sugarloaf]

· I observed this one over 9 nights. There is an ambiguity between two most likely rotation periods: 11.562 h and 15.251 h. Any help on this from someone in America will be highly appreciated.
Vladimir [2019-07-07 15:28, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed on 4 nights: June 10-11, 12-13, 26 and 28 UT.
Vladimir [2019-06-29 16:14, Sopot AO]

(14938) 1995 DN (Finished) [Add new note]
· It's insufficient data for the BinAstPhotSurvey (missing double coverage). Target closed.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2019-07-09 12:05, Ondrejov]

· More data obtained from Leura.
04/27, 04/28, 05/09, 05/14, 05/15, 05/21, 05/24, 05/26, 05/27, 06/01
Period is 7.81h amp 0.7mag [2019-06-04 12:17, Blue Mountains Obs] Message sent to observers

· Observed on May 10-11, 22:33-02:03 UT.
Vladimir [2019-05-11 14:41, Sopot AO]

· Start a new target 04/26 from 17 UT to 19:30 UT [2019-04-27 10:51, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3315) Chant (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot on 8 nights: Unique solution, no significant deviation.
http://www.asu.cas.cz/~asteroid/03315.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-07-09 07:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed on June 06-07 and June 07-08 UT.
Vladimir [2019-06-08 10:28, Sopot AO]

(5574) Seagrave (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and by Marek Husarik from Skalnate Pleso: Good solution, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05574.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-26 13:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did a run on this on June 22 and am running it tonight, June 23.
Don [2019-06-23 01:58, Sugarloaf]

· Observing this one from 20 UT.
Marek [2019-06-12 20:20, SkalnatePleso] [Remove]
Message sent to observers

· Starting with this one from 20 UT. [2019-06-10 20:13, SkalnatePleso] [Remove]

· Observing from 20 UT. [2019-06-09 21:44, SkalnatePleso] [Remove]
Message sent to observers

· Observed this new target on June 7+8.
Don [2019-06-08 14:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

(194513) 2001 XR2 (Finished) [Add new note]
· Missing double coverage, thus not sufficient data for the BinAstPhotSurvey. Target closed. Petr [2019-06-17 11:34, Ondrejov]

· 194513 Mars-crossing worked last night with T150 Sierra Nevada Observatory, Spain.

P around 6 hours. [2018-08-01 09:01, IAO-Isaac Aznar Obs.] Message sent to BinAstPhotSurvey conference

(50717) Jimfox (Finished) [Add new note]
· Insufficient data, target closed. [2019-06-17 10:58, Ondrejov]

· I will start this new target at on 5/28 at 3UT.

Russ [2019-05-28 02:52, Shed of Science] Message sent to BinAstPhotSurvey conference

(18348) 1990 BM1 (Finished) [Add new note]
· Missing double coverage, thus not sufficient data for the BinAstPhotSurvey. Target closed. Petr [2019-06-17 10:44, Ondrejov]

· Will be starting about 1:30 UT 2/13

Russ [2019-02-13 01:41, Shed of Science] Message sent to BinAstPhotSurvey conference

· Started at 1:45 UT 1/26

Russ [2019-01-26 01:47, Shed of Science]

(65972) 1998 HJ28 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: U = 2 solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/65972.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-13 13:56, Ondrejov] Message sent to BinAstPhotSurvey conference

(65472) 1998 HJ28 (Finished) [Add new note]
· Erroneous designation. Record to be deleted. [2019-06-13 13:53, Ondrejov]

· Started this on Oct 10 UT.
Don [2018-10-11 01:31, Sugarloaf] Message sent to BinAstPhotSurvey conference

(7393) Luginbuhl (Finished) [Add new note]
· Insufficient data for this target. Closed. [2019-06-13 13:47, Ondrejov]

· Started this on Jan 2 UT.
Don [2019-01-03 01:31, Sugarloaf] Message sent to BinAstPhotSurvey conference

(10422) 1999 AN22 (Finished) - slow rotator [Add new note]
· Vladimir Benishek observed this new target from Sopot, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/10422.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-13 13:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on May 10-11, 19:48-00:51 UT.
Vladimir [2019-05-11 14:43, Sopot AO]

· A slow rotator. Observed on two nights: Apr. 25-26, 22:59-02:23 UT and May 02-03, 20:23-02:04 UT.
Vladimir [2019-05-03 12:32, Sopot AO] Message sent to BinAstPhotSurvey conference

(20492) 1999 OC5 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/20492.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-13 12:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this new target on June 7+8.
Don [2019-06-08 14:09, Sugarloaf]

(16529) Dangoldin (Finished) [Add new note]
· It's a bit marginal data, but usable for the Survey, after all.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-13 12:18, Ondrejov]

· Observed on 4 nights.
Vladimir [2018-10-16 14:37, Sopot AO] Message sent to BinAstPhotSurvey conference

(15779) Scottroberts (Finished) [Add new note]
· Target closed. [2019-06-13 11:08, Ondrejov]

· Vladimir Benishek has observed this off-list target from Sopot, found there deviations from strict periodicity. We don't understand it yet. A formal best fit 1-period solution:
http://www.asu.cas.cz/~asteroid/15779.png

Vladimir would appreciate a help by people here. The asteroid is at low galactic latitudes, so be carefull about interferences with background stars.

Clear Skies, Petr [2018-10-02 05:37, Ondrejov] Message sent to BinAstPhotSurvey conference

(6876) Beppeforti (Finished) - slow rotator [Add new note]
· Slow rotator, closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-13 10:11, Ondrejov]

· Started this July 12 UT. Looks like a fairly slow rotator.
Don [2018-07-12 21:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1959) Karbyshev (Finished) [Add new note]
· This target was not done sufficiently for the Survey. Closed. Petr [2019-06-13 10:04, Ondrejov]

· Observed by David Romeuf on 4 nights.
Found a period of 7,724h with an amplitude of 0.43mag.
Romain [2018-09-18 14:02, OPERA] Message sent to observers

· Observed last night (Sep. 17-18, 18:11-01:28 UT).
Vladimir [2018-09-18 12:38, Sopot AO] Message sent to BinAstPhotSurvey conference

(7326) Tedbunch (Finished) - slow rotator [Add new note]
· This is a slow tumbler. Closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-12 12:33, Ondrejov]

· Observed on four nights (Aug. 4-5, Aug. 5-6, Aug. 6-7 and Aug. 7-8 UT). It turned out to be a slow rotator.
Vladimir [2018-08-08 14:08, Sopot AO] Message sent to BinAstPhotSurvey conference

(4786) Tatianina (Finished) - return binary [Add new note]
· We have not got sufficient data to solve this demanding target. Closed. Petr [2019-06-12 12:20, Ondrejov]

· Observing this one tonight.
Don [2018-11-11 22:57, Sugarloaf] Message sent to observers

· Planning to start a run at 00:40 UT.
Don [2018-11-08 00:29, Sugarloaf]

· I'll be starting this at 01:15 UT.
Don [2018-10-31 00:54, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start this at 02:10 UT.
Don [2018-10-19 00:03, Sugarloaf] Message sent to observers

· Plan to start this one at 02:30 UT.
Don [2018-10-14 01:47, Sugarloaf]

· Name corrected :-).
Petr S. [2018-10-10 12:50, Ondrejov]

· I misspelled the target's name in the listing. Someone with access needs to correct it.

I'll be starting a run on Tatianina at 02:50 UT. Hopefully, clouds will hold off.

Don [2018-10-10 00:22, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for the 3rd apparition. Petr [2017-07-03 06:02, Ondrejov]

· I've done a few nights from BMO , 04/20, 04/22, 04/26, 04/27, 04/28. Data reduced and sent in [2017-05-04 09:41, Blue Mountains Obs] Message sent to observers

· I have observed 4786 on four recent nights from Dark Sky and Perth.

57870 0323-0916 UT
57871 1458-2008
57871 0418-0916
57872 1341-2005

I am about to begin the reduction on these. Joe [2017-05-02 16:55, Dark Sky & PROMPT] Message sent to observers

· Kamil Hornoch and Petr Fatka observed this return binary from here on the first night in its current third apparition. Captured what appears to be a mutual event, but the solution needs to be improved with more data (both in and outside events). As the weather here is variable these days and nights and also the telescope is shared with another project, it's not certain that we will take more data soon. Thus I encourage others here to help out; sessions at least 2 hours long and with errors < 0.02 mag are needed.

Clear Skies, Petr [2017-05-02 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Marginal data, closed for this apparition. Petr [2013-03-25 07:19, Ondrejov]

· Working from SRO tonight. [2013-03-12 05:29, Sonoita] Message sent to observers

· Just started a run from SRO tonight. [2013-03-11 03:59, Sonoita]

· Working from SRO tonight. [2013-03-07 05:53, Sonoita]

· Working tonight from SRO. [2013-03-05 07:12, Sonoita] Message sent to observers

· observed from 06:15 to 12:37 UT with no deviation [2013-02-17 14:05, Via Capote]

· observed from 04:40 10:40UT fair conditions no deviations [2013-02-15 13:45, Via Capote] Message sent to observers

· observed from 04:30 to 12:45 UT good conditions no deviations [2013-02-14 14:03, Via Capote]

· plan to observe beginning at 04:30UT [2013-02-13 04:06, Via Capote] Message sent to BinAstPhotSurvey conference

· Somewhat marginal data, solution for the orbital period weak.
http://www.asu.cas.cz/~asteroid/04786_b0.png

Closed for this apparition.

Petr [2010-08-22 09:44, Ondrejov]

· Observed 2010 07 08 in average conditions curt short by cloud. [2010-07-09 11:47, HuntersHill] Message sent to BinAstPhotSurvey conference

· Conditions for this binary have deteriorated significantly since the discovery lunation and it is not likely that good follow-up data could be obtained for its relatively small satellite. I'm therefore closing it here.

Cheers, Petr [2006-05-15 12:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· This happened to be in the same field as my primary target, 2047 Smetana, on April 16 ~4:00 UT. The data is not of the highest quality due to focus and moon. [2006-04-16 09:15, PalmerDivide]

· Our report on the detection of the binary nature of this asteroid has been published on CBET 472. I'm copying its text below for your convenience. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

So, the discovery phase for this one is over. The asteroid will be still observable in good conditions in the next lunation, so follow up observations could be taken (unless we all are busy with other targets), thus I don't mark it here as finished yet.

Cheers, Petr

(4786) TATIANINA
D. Pray, Carbuncle Hill Observatory, Greene, RI; P. Pravec and P.
Kusnirak, Ondrejov Observatory; S. Nudds, Elginfield Observatory,
University of Western Ontario; A. Galad, S. Gajdos, and J. Vilagi,
Modra Observatory; and R. Koff, Antelope Hills Observatory, Bennett,
CO, report that photometric observations obtained during Mar. 20-Apr. 8
reveal that minor planet (4786) is a binary system with an orbital
period of 21.67 ± 0.01 hours. The primary rotates with a period of
2.9227 ± 0.0001 hours, and it has a lightcurve amplitude of 0.20 mag.
Mutual eclipse/occultation events that are 0.04-mag deep indicate a
secondary-to-primary mean-diameter ratio of 0.19 ± 0.03.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 April 11 (CBET 472) Daniel W. E. Green [2006-04-12 08:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· The current solution is unique, with estimated parameters:
Pprim= 2.9227 +/-0.0001 h
Porb= 21.67 +/-0.01 h
Aprim= 0.20 mag
Depth of attenuations: 0.04 mag
Ds/Dp= 0.19 +/-0.03.

Bob's session that he's started at 03:30 UT today should cover the event around orbital phase 0.25, so it should be useful data. We'll wait for them. There is no point for Ondrejov or Modra to observe the binary tonight, as it would cover just orbital phases 0.8-1.1 between the events that have been already covered well. If Don gets perfect sky conditions tonight, he might take one additional long session covering the 0.25 phase event around 2006-04-09.2 (but don't bother in less ideal conditions). Those should be the last data for this one before we close the discovery phase and announce it on a circular.

Cheers, Petr [2006-04-08 11:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a session on (4786) at 03:30 UT.

Bob Koff [2006-04-08 03:36, AntelopeHills]

· Just finished my 6.9 hours long session under very good sky conditions. New data are fitting very well with P_orb of 21.66 h. Look at updated pictures:

http://www.asu.cas.cz/~asteroid/4786_all.png
http://www.asu.cas.cz/~asteroid/4786_longpc.png
http://www.asu.cas.cz/~asteroid/4786_shortpc.png

There were 2 new datasets added into above pictures:

2006-4-7.2 by Don Pray (CarbuncleHill),
2006-4-8.0 by me (Ondrejov).

Peter K. [2006-04-08 03:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20 UT and expecting 7 hours long run. Peter K. [2006-04-07 20:36, Ondrejov]

· New data from Modra (Adrian Galad, 2006-4-7.0) joined in. They confirm period of 21.66 h with an event right where it should be. Don should send his data later today (expecting no attenuation). Look at following pictures (updated):

http://www.asu.cas.cz/~asteroid/4786_all.png
http://www.asu.cas.cz/~asteroid/4786_longpc.png
http://www.asu.cas.cz/~asteroid/4786_shortpc.png

It's a promising forecast for tonight here so we will continue with 4786 and should cover Adrian's yesterday event again.

Peter K. [2006-04-07 09:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· If the forecast holds true, I will be starting this at 02:00, Apr 7 UT.

Don [2006-04-06 22:29, CarbuncleHill]

· So, let's look at 4786 now. Tonight its phase is around 0.7-0.8 for me. I expect long run with no apparent attenuation. Adrian [2006-04-06 22:16, Modra] Message sent to BinAstPhotSurvey conference

· Data for 4786 Tatianina re-analysed now:
11 nights by Don from Carbuncle Hill
2 nights by Peter K. from here
1 night by Shannon from Elginfield.
They are mostly long and of a good quality (errors of 0.02 mag or better). Three more sessions from Modra and one session by Russ Durkee are short and/or of lower quality, and I have not used them at this time.
The primary component is well established:
Pprim=2.92271 h (error <0.0001 h)
Aprim=0.20 mag
Orbital period is not well established yet, but a period of 21.66 h appears likely, see following pictures:
http://www.asu.cas.cz/~asteroid/4786_all.png
http://www.asu.cas.cz/~asteroid/4786_longpc.png
http://www.asu.cas.cz/~asteroid/4786_shortpc.png
The event around orbital phase 0.25 in the above pictures is just 0.04 mag deep -yes, it is indeed at our nominal detection limit for the Survey- but it is well reproduced in five sessions by Don and in the one session by Shannon. Orbital phases from 0.45 to 0.85 are much poorly covered and we need more observations to describe it there, including a (secondary?) event. Long sessions of a good quality (errors not greater than 0.02 mag) are needed. Since we also need to nail down the orbital period, I don't provide an ephemeris for events, since a coverage of any orbital phase will be useful to nail it down. Now when Arlon is out due to the nearby Moon, Tatianina should be the primary target for you who can work it with errors not greater than 0.02 mag. I also point out that good long data from other continent(s) than just America are needed to resolve the 21.66-h period well.

Cheers, Petr [2006-04-06 11:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Very short run last night again due to weather. Adrian [2006-04-05 10:18, Modra]

· Plan to start this around 02:45, Apr 3 UT.
Don [2006-04-02 23:54, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Plan to start this around 02:45, Mar 31 UT. [2006-03-31 00:46, CarbuncleHill]

· Starting at 4:50 Mar 30 UT

Shannon
Elginfield Observatory, London Ontario Canada [2006-03-30 04:51, Elginfield] Message sent to BinAstPhotSurvey conference

· Plan to start this around 02:45, Mar 30 UT.

Don [2006-03-29 23:54, CarbuncleHill]

· Plan to start this around 02:30, Mar 29 UT.

Don [2006-03-28 23:46, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Further observations from Ondrejov and Carbuncle Hill have revealed a second attenuation confirming binarity. P for the primary is 2.923h and P_orb is tentatively asummed to be 14.6h, but more data is needed to firm this up. At 15.3 mag, and +4 deg. dec, this could make a good target for many in the group.

Don [2006-03-28 16:09, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Will start at around 02:30, Mar 28 UT.

Don [2006-03-28 00:48, CarbuncleHill]

· I should be able to start this at 03:00, Mar.27 UT.

Don [2006-03-27 02:09, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I think you will be interested to see results obtained so far by Don from Carbuncle Hill and by Peter K. from here for this one. A unique solution of 2.924 h, but there is an apparent attenuation by 0.06 mag on one night that needs to be confirmed:
http://www.asu.cas.cz/~asteroid/4786.png
http://www.asu.cas.cz/~asteroid/4786_060321_dpray.png
More observations with errors <0.03 mag are therefore needed for this one.

Cheers, Petr [2006-03-24 07:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· The oasis of clear sky remains over southern New England. I started 4786 at 03:20 UT.

Don [2006-03-23 03:32, CarbuncleHill]

· Clouds from south allowed me to stay on this object just about 1.5 h. Yes, I could stay even longer, but I barely see something valuable. :-)

Adrian [2006-03-22 23:58, Modra] Message sent to BinAstPhotSurvey conference

· My observing run of Mar 21 shows an attenuation. This could be a binary system, so anyone looking for a target is urged to do a run on it if you can.

The sky here doesn't look promising, so I may be out of it tonight.

Don [2006-03-22 00:08, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed from 0 UT to 3:30 UT (after Arlon). Peter K. [2006-03-21 04:03, Ondrejov]

· I'll aim to start this at about 04:30, Mar 21 UT.

Don [2006-03-20 23:51, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I did a first run on Mar 20 UT. Looks like a short period, possiblly around 2.9h.

Don [2006-03-20 17:25, CarbuncleHill]

(2538) Vanderlinden (Finished) [Add new note]
· We have not got sufficient data to solve this tough target. Closed. Petr [2019-06-12 12:18, Ondrejov]

· Russ Durkee observed this new target on four nights. Its period is commensurate with Earth's rotation, see the data folded with a half of one of a few possible periods:
http://www.asu.cas.cz/~asteroid/02538.png
At least one session from a substantially different longitude is needed to resolve it. I encourage observers in Europe to help out.

Clear Skies, Petr [2019-02-27 06:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will be starting about 1:30 UT 2/13

Russ [2019-02-20 02:33, Shed of Science]

· Started at 1:45 UT 1/26.

Russ [2019-01-26 01:46, Shed of Science] Message sent to BinAstPhotSurvey conference

(1696) Nurmela (Finished) [Add new note]
· Target closed for the 4th apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-12 12:08, Ondrejov]

· observed in July 18, 24, and August 1,2,4,5,7,8,9,10. No event detected but possible second period. Data sent for analysis after holiday break. [2018-08-11 07:14, Blue Mountains Obs] Message sent to observers

· Start a new target 07/20 [2018-07-21 11:56, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Don Pray did it in this 3rd apparition: Good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/01696_b7.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-02-01 15:15, Ondrejov]

· Started this prime suspect at 01:10 UT.
Don [2017-01-31 01:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

· A suspect second period (might be a second rotational component) seen in the two David's nights have not been confirmed.
http://www.asu.cas.cz/~asteroid/01696_b1.png
Target closed for this apparition.

Petr [2011-08-23 07:28, Ondrejov] Message sent to observers

· Have observed this target 20110723 and 20110726 but on both occassions the starfield was too dense to extract any useful data. [2011-07-27 23:05, HuntersHill]

· Observed 2011 06 28 from 09:33UT to 15:55UT in good conditions. Dense star field but data reveals a period of 3.09 +/- 0.02hrs with an amplitude of 0.4 +/- 0.02mag. [2011-06-28 23:27, HuntersHill] Message sent to BinAstPhotSurvey conference

· Nice work, Adrian, on this one: Unique period, multiple coverage, no deviation seen,
http://www.asu.cas.cz/~asteroid/01696.png
It is finished for the Survey, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-04-10 07:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· There is no need to duplicate Kamil's observation of 1338 from here, so I've chosen a new object that also fit Petr's criteria. It is quite bright. Adrian [2007-04-06 18:25, Modra]

(6540) Stepling (Finished) [Add new note]
· Slow rotator, closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-12 11:21, Ondrejov]

· This new target was observed on Nov. 5-6 (18:36-01:08 UT).
Vladimir [2018-11-06 13:41, Sopot AO] Message sent to BinAstPhotSurvey conference

(1577) Reiss (Finished) [Add new note]
· Done for the 2nd apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-06-12 10:31, Ondrejov]

· This returning "prime suspect" was observed on Nov. 29-30, 21:50-04:52 UT.
Vladimir [2018-11-30 16:24, Sopot AO] Message sent to BinAstPhotSurvey conference

· This new target was done well by Julian from Leura, supported with a half night by Kamil from here: unique solution, good coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/01577.png
Target done:
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2011-11-01 09:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 09.43h 10/30 for 3 hours. data sent in [2011-10-31 09:58, Blue Mountains Obs] Message sent to observers

· Observed this one for 3 hours tonight. Best wishes, Kamil [2011-10-31 02:06, Ondrejov]

· Observed on the 10/20 and 23/10 to refine the period. Data sent in [2011-10-24 09:03, Blue Mountains Obs] Message sent to observers

· Started new target. period is 4.5h with amplitude 0.2m. observed on 10/18 and 10/19. [2011-10-19 21:44, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5598) Carlmurray (Finished) [Add new note]
· Done in the 3rd apparition by Julian Oey from Leura. No deviation seen. Petr [2019-06-11 11:43, Ondrejov]

· additional observations on 03/28,03/30 and 03/31 [2019-04-01 11:38, Blue Mountains Obs] Message sent to observers

· Observed this returning prime suspect on 03/26 from 9.5 UT for 8 hours [2019-03-31 07:17, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Don Pray did this return "prime suspect" from Sugarloaf Mountain on 3 nights: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/05598_b7.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-09-11 09:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Correction: 5598 is not new, but a Prime Suspect.
Don [2017-09-03 16:45, Sugarloaf] Message sent to observers

· I observed the new target on Sep 1+2.
Don [2017-09-03 16:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Russ has done this one on three nights: unique period, multiple coverage, no deviation,
http://www.asu.cas.cz/~asteroid/05598.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Russ.

Cheers,
Petr [2009-01-26 11:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will do a run on this tonight to refine the period. Will start at about 4:30 on 1/24.

Russ [2009-01-24 02:19, Shed of Science]

· Run started on this one at about 4:45 and should be able to run until about 10:00 on 1/22. First run indicated a period of about 2.94 hrs. So if the data are good it is quite possible this one could be finished after tonight.

Russ [2009-01-22 05:12, Shed of Science] Message sent to BinAstPhotSurvey conference

· Completed 6hr run from 4:30 to about 10:30 on 1/19.

Russ [2009-01-19 16:39, Shed of Science]

(3610) Decampos (Finished) [Add new note]
· Target closed. [2019-06-11 11:30, Ondrejov]

· I started this new target on Apr 1 and plan to observe it again, Apr 2 UT.
Don [2019-04-01 19:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

(76855) 2000 WD65 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on three nights: Unique solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/76855.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Don.

Petr [2019-06-10 13:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on June 9. Note that the designation 2000 WD65, should 2000 WD63.
Don [2019-06-09 17:21, Sugarloaf]

· I observed this new target on June 7+8.
Don [2019-06-08 14:07, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1344) Caubeta (Finished) - return binary [Add new note]
· Our report on this one has appeared on CBET 4634, copied below for your convenience.

Cheers, Petr

(1344) CAUBETA
B. Christmann, Soucieu-en-Jarrest, France; P. Pravec, K. Hornoch, H.
Kucakova, and P. Kusnirak, Ondrejov Observatory; D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A.; V. Benishek, Belgrade Astronomical
Observatory; R. Montaigut and A. Leroy, OPERA Observatory, France; A. Marchini,
R. Papini, and F. Salvaggio, Dipartimento di Scienze Fisiche, Della Terra e
Dell'Ambiente, University of Siena; A. Aznar Macias, Astronomia Para Todos
Observatories Group, Spain; and M. Serra-Ricart and J. Licandro, Instituto de
Astrofisica de Canarias, report that photometric observations obtained with a
0.20-m telescope at Soucieu-en-Jarrest, a 0.65-m telescope at Ondrejov
Observatory, a 0.50-m telescope at the Sugarloaf Mountain Observatory, a
0.35-m telescope at the Sopot Observatory in Serbia, a 0.20-m telescope at
the OPERA Observatory, a 0.30-m telescope at the Astronomical Observatory of
the University of Siena, and a 0.45-m telescope at Observatorio del Teide
during Feb. 17-Mar. 26 reveal that minor planet (1344) is a binary system
with an orbital period of 42.40 Â± 0.03 hr. The primary shows a period of
3.12219 Â± 0.00006 hr and has a lightcurve amplitude of 0.43 mag at solar
phases 5-9 deg. Mutual eclipse/occultation events that are 0.08 to 0.16
magnitude deep indicate a lower limit on the secondary-to-primary mean-
diameter ratio of 0.27. The mean absolute magnitude in the Cousins R
photometric system is H_R = 12.79 Â± 0.06, assuming the phase relation slope
parameter G = 0.24 Â± 0.11.

2019 June 3 (CBET 4634) Daniel W. E. Green [2019-06-04 07:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our campaign on this one is over now. The data obtained until March 26:
http://www.asu.cas.cz/~asteroid/01344_2019a_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019a_p1.png
http://www.asu.cas.cz/~asteroid/01344_2019b_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019b_p1.png
http://www.asu.cas.cz/~asteroid/01344_2019c_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019c_p1.png
Observations obtained later in the apparition showed further lc evolution, but they are limited (shorter runs and higher noise) and we will have to analyze them more thoroughly in the future. Anyway, the data obtained from February 17 to March 26 established the binary well, so we are going to do a CBET on it.

Cheers, Petr [2019-05-30 08:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Had a short run on Caubeta last night from SRO. Will run it again tonight. -Walt [2019-05-29 00:15, Sonoita] Message sent to observers

· Started a run tonight. Conditions look better than last night.

Russ [2019-05-24 03:20, Shed of Science]

· Just starting another 3 hour run on 1344. Weather not quite as good as last night.

Russ [2019-05-23 02:34, Shed of Science] Message sent to observers

· Just started a 3 hour run on 1344. Weather looks pretty good.
Russ [2019-05-22 02:46, Shed of Science]

· I am going to try to get a four hour run in on 1344 tonight starting at about 2UT 5/15

Russ [2019-05-15 02:09, Shed of Science] Message sent to observers

· Observed on May 02, 19:31-21:46 UT.
Vladimir [2019-05-03 12:20, Sopot AO]

· Started again tonight 4/28
Russ [2019-04-28 04:15, Shed of Science]

· Started on 4/26 about 2:30UT
Russ [2019-04-27 02:14, Shed of Science] Message sent to observers

· Observed on Apr. 25, 19:02-22:25 UT.
Vladimir [2019-04-26 13:00, Sopot AO] Message sent to BinAstPhotSurvey conference

· Started on 4/26 about 2:30UT
Russ [2019-04-26 02:40, Shed of Science] Message sent to observers

· Started this one on 4/19 3UT .

Russ [2019-04-19 02:35, Shed of Science]

· An interesting evolution in this binary. There was an event on 2019-03-23.8, but apparently not at 2019-03-28 to -30:
http://www.asu.cas.cz/~asteroid/01344_2019a_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019a_p1.png
http://www.asu.cas.cz/~asteroid/01344_2019b_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019b_p1.png
http://www.asu.cas.cz/~asteroid/01344_2019c_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019c_p1.png
http://www.asu.cas.cz/~asteroid/01344_2019d_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019d_p1.png

Such rapid lc evolution is unusual, but not impossible for the relatively wide binary. It would be good to check it with more good data (covering any orbital phase) with errors not greater than 0.02 mag.

Clear Skies, Petr [2019-04-16 13:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this new binary:
http://www.asu.cas.cz/~asteroid/01344_2019a_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019a_p1.png
http://www.asu.cas.cz/~asteroid/01344_2019b_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019b_p1.png

Before we publish it on CBET, one more good coverage for each of the two events is needed, to refine the orbital period and constrain size ratio. Only good data with errors < 0.02 mag will be useful; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 3-24 16.29 0.250
2019- 3-26 10.69 0.250
2019- 3-28 5.09 0.250
2019- 3-29 23.49 0.250
2019- 3-31 17.89 0.250
2019- 4- 2 12.29 0.250
2019- 4- 4 6.69 0.250
2019- 4- 6 1.09 0.250
2019- 4- 7 19.49 0.250
2019- 4- 9 13.89 0.250
2019- 4-11 8.29 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2019- 3-25 13.59 0.753
2019- 3-27 7.99 0.753
2019- 3-29 2.39 0.753
2019- 3-30 20.79 0.753
2019- 4- 1 15.19 0.753
2019- 4- 3 9.59 0.753
2019- 4- 5 3.99 0.753
2019- 4- 6 22.39 0.753
2019- 4- 8 16.79 0.753
2019- 4-10 11.19 0.753
2019- 4-12 5.59 0.753

Clear Skies, Petr [2019-03-19 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this on Mar 13 and caught the 0.749 phase event.
Don [2019-03-14 01:40, Sugarloaf] Message sent to observers

· Additional data by Bruno Christmann and by Romain Montaigut and Arnaud Leroy with OPERA joined in; Bruno captured a full event. The solution appears likely:
http://www.asu.cas.cz/~asteroid/01344_2019a_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019a_p1.png

More data with errors not greater than 0.02 mag (don't bother in sub-optimal conditions) are needed to nail it down. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 3- 1 17.21 0.249
2019- 3- 3 11.66 0.249
2019- 3- 5 6.11 0.249
2019- 3- 7 0.56 0.249
2019- 3- 8 19.01 0.249
2019- 3-10 13.46 0.249
2019- 3-12 7.91 0.249
2019- 3-14 2.36 0.249
2019- 3-15 20.81 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2019- 2-28 19.97 0.749
2019- 3- 2 14.42 0.749
2019- 3- 4 8.87 0.749
2019- 3- 6 3.32 0.749
2019- 3- 7 21.77 0.749
2019- 3- 9 16.22 0.749
2019- 3-11 10.67 0.749
2019- 3-13 5.12 0.749
2019- 3-14 23.57 0.749
2019- 3-16 18.02 0.749

Clear Skies, Petr [2019-02-28 14:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one was a binary suspect from our observations in previous years, but recent observations by Bruno Christmann, supported with observations by Kamil Hornoch and Hana Kucakova from here, showed two attenuations. A tentative lc decomposition (the orbital period is not unique):
http://www.asu.cas.cz/~asteroid/01344_2019a_porb.png
http://www.asu.cas.cz/~asteroid/01344_2019a_p1.png

We need to capture more events to establish it well. I encourage people here to help out; data with errors <= 0.03 mag are needed.

Clear Skies, Petr [2019-02-27 14:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done for the 3rd apparition --- still inconclusive. Petr [2014-12-02 14:41, Ondrejov]

· Did run last night (56989) 0045-0800 UT from Prompt Tololo. Joe [2014-11-19 03:27, Dark Sky & PROMPT] Message sent to observers

· Started a run at 00:25 UT.
Don [2014-11-19 02:33, Sugarloaf]

· Will run from SRO tonight. -Walt [2014-11-17 01:51, Sonoita]

· I Plan to start this at 02:00 UT.
Don [2014-10-31 01:21, Sugarloaf] Message sent to observers

· I started this suspect binary at 02:40 UT.
Don [2014-10-30 03:11, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Two periods resolved, but no obvious mutual events - it remains a probable binary. Closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2012-02-08 12:22, Ondrejov]

· Observing from ~17UT. if the weather holds, we plan to pursue another target from ~19:30UT. Jozef, Stefan. [2012-01-27 17:25, Modra]

· Observed shortly between 18-20 UT. Jozef, Stefan. [2012-01-26 23:06, Modra]

· Observed under good conditions 02:15-05:00UT [2012-01-26 14:56, Via Capote] Message sent to observers

· One more night Jan. 20/21. in partly cloudy conditions. Leos [2012-01-24 12:12, Modra]

· Trying it under cirrus clouds from 17:42 UT on Jan.18, 2012.
Stefan [2012-01-18 17:56, Modra]

· Jim has observed this "prime suspect" (i.e., asteroid with a period and amplitude in the binaries range, but not being recognized as binary from our previous observations) from Via Capote on 11 nights. He has found an apparent second period, see
http://www.asu.cas.cz/~asteroid/01344_2011_12_p1.png
http://www.asu.cas.cz/~asteroid/01344_2011_12_p2.png
http://www.asu.cas.cz/~asteroid/01344_2011_12_p2_nsp.png
Despite its amplitude of 0.03 mag only, it appears to be detected at a significant level. It may be a secondary's rotation. Given that the estimated second period is close to 1/3 day, we would like to ask one of you at a longitude significantly different from Via Capote to take one full-night high-quality lightcurve (errors <= 0.01 mag), to check/eliminate possible alias with 1 day.

Clear Skies, Petr [2012-01-08 10:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed under good conditions but with some elevated sky background levels. P1 has stabilized at 3.1221h and a weak secondary period at 7.98h seems to be getting somewhat stronger as more data is collected. [2012-01-05 14:38, Via Capote] Message sent to observers

· observed under breezy conditions from 04:30 to 12:15 UT [2012-01-04 14:52, Via Capote]

· observed under good conditions from 05:00 to 12:30 UT [2012-01-02 15:01, Via Capote] Message sent to observers

· observed under good conditions with some light winds picking up later in the session. From 4:30 to 12:30 UT [2012-01-01 14:24, Via Capote]

· observed on UT12.30 and 12.31 under good conditions. No deviations observed [2011-12-31 14:26, Via Capote] Message sent to observers

· Observed from 05:00 to 12:40 UT under variable but generally good conditions. Primary period is settling in at 3.122h. Possible very weak secondary period at 7.96h. [2011-12-29 15:11, Via Capote]

· Observed from 05:30 to 1245 UT under good conditions [2011-12-28 15:53, Via Capote] Message sent to observers

· observed under good conditions 05:15 to 10:40 UT with no deviations [2011-12-26 14:39, Via Capote]

· Observed under good conditions 06:00 to 13:00 UT Period 3.12h with no deviations. [2011-12-25 14:52, Via Capote] Message sent to observers

· Observed under good conditions 06:15 to 12:30 UT. Period 3.19h with no deviations [2011-12-24 15:16, Via Capote] Message sent to BinAstPhotSurvey conference

· Don from Carbuncle, Russ from Shed of Science, and Vasilij from Kharkiv have done it well: Unique period, multiple coverage, no attenuation above the 0.04-mag limit of the Survey,
http://www.asu.cas.cz/~asteroid/01344.png
It is done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2009-04-02 09:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:45 UT.
Don [2009-04-01 01:22, CarbuncleHill]

· Did a ~2h run on this one before clouds rolled in.

Russ [2009-03-28 05:29, Shed of Science] Message sent to observers

· I started this new target on Mar 26 UT. Intial period estimate is 3.07h, amplitude ~0.2m. [2009-03-26 16:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(72036) 2000 XM44 (Finished) - return binary [Add new note]
· Our report on this one has appeared on CBET 4632, copied below for your convenience.

Cheers, Petr

(72036) 2000 XM44
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
K. Hornoch, and P. Kusnirak, Ondrejov Observatory; D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A.; W. Cooney, Starry Night Observatory,
Columbus, TX, U.S.A.; J. Gross, Sonoita Research Observatory, Sonoita, AZ,
U.S.A.; and D. Terrell, Southwest Research Institute, report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia,
a 0.65-m telescope at the Ondrejov Observatory, a 0.50-m telescope at the
Sugarloaf Mountain Observatory, and a 0.50-m telescope at the Sonoita Research
Observatory during Mar. 18-Apr. 25 reveal that minor planet (72036) is a
binary system with an orbital period of 18.774 Â± 0.012 hr. The primary
shows a period of 2.5820 Â± 0.0002 hr and has a lightcurve amplitude of 0.12
magnnitude at solar phases 12-16 degrees, suggesting a nearly spheroidal
shape. Mutual eclipse/occultation events that are 0.07 to 0.10 magnitude
deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.25. The mean absolute R magnitude in the Cousins system is H_R = 14.26 Â±
0.10, assuming the phase-relation slope parameter G = 0.24 Â± 0.11.

2019 May 29 (CBET 4632) Daniel W. E. Green [2019-05-30 07:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our data for this new binary:
http://www.asu.cas.cz/~asteroid/72036_2019a_porb.png
http://www.asu.cas.cz/~asteroid/72036_2019a_p1.png
http://www.asu.cas.cz/~asteroid/72036_2019b_porb.png
http://www.asu.cas.cz/~asteroid/72036_2019b_p1.png
Going to do an announcement for CBET.

Petr [2019-05-20 11:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night (May 10, 19:07-21:35 UT).
Vladimir [2019-05-11 14:38, Sopot AO]

· observed on the 04/28, 04/29, 05/04 ranging from 2-4 hours length sessions. [2019-05-05 21:09, Blue Mountains Obs] Message sent to observers

· Observed on May 02, 19:28-22:24 UT.
Vladimir [2019-05-03 11:30, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed last night (Apr. 25, 18:57-23:57 UT).
Vladimir [2019-04-26 11:53, Sopot AO]

· Our current data for this new binary:
http://www.asu.cas.cz/~asteroid/72036_2019a_porb.png
http://www.asu.cas.cz/~asteroid/72036_2019a_p1.png

Before we publish it on CBET, it would be good to refine the solution with more data (at any orbital phase). Only data with errors of 0.02 mag or better will be useful; don't bother in sub-optimal conditions.

Clear Skies, Petr [2019-04-17 13:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 01:00 UT.
Don [2019-04-02 00:26, Sugarloaf] Message sent to observers

· Observed on Mar. 29-30 (18:41-03:10 UT) and Mar. 30-31 (18:36-02:17 UT).
Vladimir [2019-03-31 13:31, Sopot AO] Message sent to BinAstPhotSurvey conference

· Working from SRO tonight. -Walt [2019-03-31 02:56, Sonoita] Message sent to observers

· Observed on Mar. 28-29 (21:09-03:01 UT).
Vladimir [2019-03-29 14:10, Sopot AO] Message sent to BinAstPhotSurvey conference

· This new target was observed by Vladimir Benishek from Sopot and by Don Pray from Sugarloaf Mountain. They both found it suspicious. A tentative solution (not unique):
http://www.asu.cas.cz/~asteroid/72036_2019a_porb.png
http://www.asu.cas.cz/~asteroid/72036_2019a_p1.png

More data (with errors <= 0.02 mag; don't bother in sub-optimal conditions) are needed to establish it. I encourage others here to help out.

Clear Skies, Petr [2019-03-28 14:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one was observed on Feb. 18-19 (21:40-04:06 UT), Mar. 13-14 (01:43-03:52 UT), Mar. 17-18 (21:04-03:45 UT), Mar. 27 (01:08-03:14) and Mar. 27-28 (18:54-03:07 UT).
Vladimir [2019-03-28 14:11, Sopot AO] Message sent to BinAstPhotSurvey conference

· Started this on Mar 27 and will run again on Mar 28 UT.
Don [2019-03-28 00:13, Sugarloaf]

(2873) Binzel (Finished) - return binary [Add new note]
· Our discovery announcement on this binary has appeared on CBET 4628, copied below for your convenience.

Cheers, Petr

(2873) BINZEL
F. Vachier, Observatoire de Paris; P. Pravec, H. Kucakova, K. Hornoch,
and P. Kusnirak, Ondrejov Observatory; D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A.; W. Cooney, Starry Night Observatory,
Columbus, TX, U.S.A.; J. Gross, Sonoita Research Observatory, Sonoita, AZ,
U.S.A.; D. Terrell, Southwest Research Institute; B. Flanagan and B. Pellerin,
Madrona Peak Observatory, Medina, TX, U.S.A.; R. Durkee, Shed of Science South
Observatory, Pontotoc, TX, U.S.A.; V. Benishek, Belgrade Astronomical
Observatory; and J. Berthier, A. Klotz, J.-P. Teng, A. Peyrot, and P. Thierry,
Observatoire des Makes, Reunion, report that photometric observations taken
with a 0.6-m telescope at the Observatoire des Makes, a 0.65-m telescope at
the Ondrejov Observatory, a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.50-m telescope at the Sonoita Research Observatory, a 0.60-m
telescope at the Madrona Peak Observatory, a 0.50-m telescope at the Shed of
Science South Observatory, and a 0.35-m telescope at the Sopot Observatory in
Serbia during Mar. 8-May 9 reveal that minor planet (2873) is a binary system
with an orbital period of 44.58 Â± 0.03 hr. The primary shows a period of
2.70371 Â± 0.00008 hr and has a lightcurve amplitude of 0.11 mag at solar
phases 12-18 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/
occultation events that are 0.04 to 0.09 magnitude deep indicate a lower
limit on the secondary-to-primary mean-diameter ratio of 0.25. The mean
absolute R magnitude in the Cousins system is H_R = 12.52 Â± 0.11, assuming
the phase-relation slope parameter G = 0.24 Â± 0.11.

2019 May 17 (CBET 4628) Daniel W. E. Green [2019-05-19 14:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our complete data for this new binary:
http://www.asu.cas.cz/~asteroid/02873_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02873_2019a_p1.png
http://www.asu.cas.cz/~asteroid/02873_2019b_porb.png
http://www.asu.cas.cz/~asteroid/02873_2019b_p1.png
http://www.asu.cas.cz/~asteroid/02873_2019c_porb.png
http://www.asu.cas.cz/~asteroid/02873_2019c_p1.png
We are going to do an announcement for CBET.

Cheers, Petr [2019-05-14 07:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Ran this asteroid at SRO on May 3/4 and May 4/5. Runs are short this late in the apparition. -Walt [2019-05-05 21:55, Sonoita] Message sent to observers

· Got four hour run on night of May 1-2 at SRO. -Walt [2019-05-03 13:37, Sonoita]

· Started this one on 4/26 UT at 2:30
Russ [2019-04-26 02:39, Shed of Science] Message sent to observers

· Ran with 24" at Madrona Peak last night (UT 4/20). Data reduced and sent in. -Walt [2019-04-20 17:55, Sonoita]

· Will try this one again starting at about 2:00 UT 4/19/

Russ [2019-04-19 01:42, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/02873_2019b_porb.png
http://www.asu.cas.cz/~asteroid/02873_2019b_p1.png
http://www.asu.cas.cz/~asteroid/02873_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02873_2019a_p1.png
We still don't have a satisfactory solution for the orbital period. More data (errors < 0.02 mag; don't bother in less ideal conditions) are needed.

Clear Skies, Petr [2019-04-16 13:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started in April 9, about 2:30UT.
Russ [2019-04-09 02:28, Shed of Science] Message sent to observers

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/02873_2019b_porb.png
http://www.asu.cas.cz/~asteroid/02873_2019b_p1.png
http://www.asu.cas.cz/~asteroid/02873_2019a_porb.png
http://www.asu.cas.cz/~asteroid/02873_2019a_p1.png
The P_orb is not well established yet, we need to nail it down with more data (errors < 0.02 mag; don't bother in less ideal conditions).

Clear Skies, Petr [2019-04-03 06:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this under good conditions at 00:20 UT.
Don [2019-04-02 00:24, Sugarloaf]

· This new target was observed by Fred Vachier, by Don Pray from Sugarloaf Mountain, and by Vladimir Benishek from Sopot. A tentative solution:
http://www.asu.cas.cz/~asteroid/02873_2019a_p1.png
http://www.asu.cas.cz/~asteroid/02873_2019a_porb.png
(P_orb is not unique, obviously.)

More data (errors < 0.02 mag) are needed to confirm it. Only good data are going to be useful; don't bother in less ideal conditions.

Clear Skies, Petr [2019-03-17 14:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one on Mar 9.
Don [2019-03-11 14:00, Sugarloaf]

(3309) Brorfelde (Finished) - return binary [Add new note]
· Done for the 6th apparition. Petr [2019-05-14 08:00, Ondrejov]

· Observed this return binary 27 April from 18:20 UT to 23:40 UT. Vasilij Ch. [2019-04-27 23:54, Kharkiv] Message sent to observers

· Russ Durkee took first data for this binary in its current apparition:
http://www.asu.cas.cz/~asteroid/03309_2019a_porb.png
http://www.asu.cas.cz/~asteroid/03309_2019a_p1.png

More data with errors 0.01 mag (don't bother in less ideal conditions) would be useful for refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 4-22 19.43 0.256
2019- 4-23 13.89 0.256
2019- 4-24 8.35 0.256
2019- 4-25 2.81 0.256
2019- 4-25 21.27 0.256
2019- 4-26 15.73 0.256
2019- 4-27 10.19 0.256
2019- 4-28 4.65 0.256
2019- 4-28 23.11 0.256
2019- 4-29 17.57 0.256
2019- 4-30 12.03 0.256
2019- 5- 1 6.49 0.256
2019- 5- 2 0.95 0.256
2019- 5- 2 19.41 0.256
2019- 5- 3 13.87 0.256
2019- 5- 4 8.33 0.256
2019- 5- 5 2.79 0.256
2019- 5- 5 21.25 0.256
2019- 5- 6 15.71 0.256
2019- 5- 7 10.17 0.256
2019- 5- 8 4.63 0.256
2019- 5- 8 23.09 0.256
2019- 5- 9 17.55 0.256
2019- 5-10 12.01 0.256
2019- 5-11 6.47 0.256
2019- 5-12 0.93 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2019- 4-23 4.65 0.756
2019- 4-23 23.11 0.756
2019- 4-24 17.57 0.756
2019- 4-25 12.03 0.756
2019- 4-26 6.49 0.756
2019- 4-27 0.95 0.756
2019- 4-27 19.41 0.756
2019- 4-28 13.87 0.756
2019- 4-29 8.33 0.756
2019- 4-30 2.79 0.756
2019- 4-30 21.25 0.756
2019- 5- 1 15.71 0.756
2019- 5- 2 10.17 0.756
2019- 5- 3 4.63 0.756
2019- 5- 3 23.09 0.756
2019- 5- 4 17.55 0.756
2019- 5- 5 12.01 0.756
2019- 5- 6 6.47 0.756
2019- 5- 7 0.93 0.756
2019- 5- 7 19.39 0.756
2019- 5- 8 13.85 0.756
2019- 5- 9 8.31 0.756
2019- 5-10 2.77 0.756
2019- 5-10 21.23 0.756
2019- 5-11 15.69 0.756
2019- 5-12 10.15 0.756

Clear Skies, Petr [2019-04-16 12:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did one night on 4/15 for this return binary.

Russ [2019-04-16 01:49, Shed of Science]

· Finished for this apparition. Petr [2014-05-12 11:57, Ondrejov]

· Observing from 20:20 UT. Peter K. [2014-04-26 20:43, Ondrejov] Message sent to observers

· Started a run at 01:00 and hope to catch the 0.250 phase event.
Don [2014-04-25 01:28, Sugarloaf]

· Started a run at 21:50 UT. Peter K. [2014-04-21 22:05, Ondrejov] Message sent to observers

· More data were taken by Don Pray from Sugarloaf Mountain, by Jan Vrastil and Kamil Hornoch from here, by Jozo Vilagi from Modra, and by Nelya Gaftonyuk from Simeiz,
http://www.asu.cas.cz/~asteroid/03309_2014_porb.png
http://www.asu.cas.cz/~asteroid/03309_2014_p1.png

Last data (errors <= 0.02 mag) for both events would be useful in the upcoming lunation; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-18 4.52 0.250
2014- 4-18 22.98 0.250
2014- 4-19 17.44 0.250
2014- 4-20 11.90 0.250
2014- 4-21 6.36 0.250
2014- 4-22 0.82 0.250
2014- 4-22 19.28 0.250
2014- 4-23 13.74 0.250
2014- 4-24 8.20 0.250
2014- 4-25 2.66 0.250
2014- 4-25 21.12 0.250
2014- 4-26 15.58 0.250
2014- 4-27 10.04 0.250
2014- 4-28 4.50 0.250
2014- 4-28 22.96 0.250
2014- 4-29 17.42 0.250
2014- 4-30 11.88 0.250
2014- 5- 1 6.34 0.250
2014- 5- 2 0.80 0.250
2014- 5- 2 19.26 0.250
2014- 5- 3 13.72 0.250
2014- 5- 4 8.18 0.250
2014- 5- 5 2.64 0.250
2014- 5- 5 21.10 0.250
2014- 5- 6 15.56 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-18 13.76 0.751
2014- 4-19 8.22 0.751
2014- 4-20 2.68 0.751
2014- 4-20 21.14 0.751
2014- 4-21 15.60 0.751
2014- 4-22 10.06 0.751
2014- 4-23 4.52 0.751
2014- 4-23 22.98 0.751
2014- 4-24 17.44 0.751
2014- 4-25 11.90 0.751
2014- 4-26 6.36 0.751
2014- 4-27 0.82 0.751
2014- 4-27 19.28 0.751
2014- 4-28 13.74 0.751
2014- 4-29 8.20 0.751
2014- 4-30 2.66 0.751
2014- 4-30 21.12 0.751
2014- 5- 1 15.58 0.751
2014- 5- 2 10.04 0.751
2014- 5- 3 4.50 0.751
2014- 5- 3 22.96 0.751
2014- 5- 4 17.42 0.751
2014- 5- 5 11.88 0.751
2014- 5- 6 6.34 0.751

Clear Skies, Petr [2014-04-11 09:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 2014-03-31, phase 0.75
Nelya. [2014-04-03 14:15, Simeiz] Message sent to observers

· Planning to start this one at 01:15 UT, weather permitting. I should catch most of the 0.245 phase event.
Don [2014-03-06 00:17, Sugarloaf]

· Started this at 01:30 UT, and hope to capture the 0.75 phase event.
Don [2014-03-04 02:28, Sugarloaf] Message sent to observers

· Don Pray took first data for this return binary in its current apparition, covered one and half event:
http://www.asu.cas.cz/~asteroid/03309_2014_porb.png
http://www.asu.cas.cz/~asteroid/03309_2014_p1.png

As usual, covering each of the two events twice per lunation would be ideal for refining the system's model; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 3- 3 19.29 0.245
2014- 3- 4 13.75 0.245
2014- 3- 5 8.21 0.245
2014- 3- 6 2.67 0.245
2014- 3- 6 21.13 0.245
2014- 3- 7 15.59 0.245
2014- 3- 8 10.05 0.245
2014- 3- 9 4.51 0.245
2014- 3- 9 22.97 0.245
2014- 3-10 17.43 0.245
2014- 3-11 11.89 0.245
2014- 3-12 6.35 0.245
2014- 3-13 0.81 0.245
2014- 3-13 19.27 0.245
2014- 3-20 17.41 0.245
2014- 3-21 11.87 0.245
2014- 3-22 6.33 0.245
2014- 3-23 0.79 0.245
2014- 3-23 19.25 0.245
2014- 3-24 13.71 0.245
2014- 3-25 8.17 0.245
2014- 3-26 2.63 0.245
2014- 3-26 21.09 0.245
2014- 3-27 15.55 0.245
2014- 3-28 10.01 0.245
2014- 3-29 4.47 0.245
2014- 3-29 22.93 0.245
2014- 3-30 17.39 0.245
2014- 3-31 11.85 0.245
2014- 4- 1 6.31 0.245
2014- 4- 2 0.77 0.245
2014- 4- 2 19.23 0.245
2014- 4- 3 13.69 0.245
2014- 4- 4 8.15 0.245
2014- 4- 5 2.61 0.245
2014- 4- 5 21.07 0.245
2014- 4- 6 15.53 0.245
2014- 4- 7 9.99 0.245
2014- 4- 8 4.45 0.245
2014- 4- 8 22.91 0.245
2014- 4- 9 17.37 0.245
2014- 4-10 11.83 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2014- 3- 3 10.14 0.750
2014- 3- 4 4.60 0.750
2014- 3- 4 23.06 0.750
2014- 3- 5 17.52 0.750
2014- 3- 6 11.98 0.750
2014- 3- 7 6.44 0.750
2014- 3- 8 0.90 0.750
2014- 3- 8 19.36 0.750
2014- 3- 9 13.82 0.750
2014- 3-10 8.28 0.750
2014- 3-11 2.74 0.750
2014- 3-11 21.20 0.750
2014- 3-12 15.66 0.750
2014- 3-13 10.12 0.750
2014- 3-20 8.26 0.750
2014- 3-21 2.72 0.750
2014- 3-21 21.18 0.750
2014- 3-22 15.64 0.750
2014- 3-23 10.10 0.750
2014- 3-24 4.56 0.750
2014- 3-24 23.02 0.750
2014- 3-25 17.48 0.750
2014- 3-26 11.94 0.750
2014- 3-27 6.40 0.750
2014- 3-28 0.86 0.750
2014- 3-28 19.32 0.750
2014- 3-29 13.78 0.750
2014- 3-30 8.24 0.750
2014- 3-31 2.70 0.750
2014- 3-31 21.16 0.750
2014- 4- 1 15.62 0.750
2014- 4- 2 10.08 0.750
2014- 4- 3 4.54 0.750
2014- 4- 3 23.00 0.750
2014- 4- 4 17.46 0.750
2014- 4- 5 11.92 0.750
2014- 4- 6 6.38 0.750
2014- 4- 7 0.84 0.750
2014- 4- 7 19.30 0.750
2014- 4- 8 13.76 0.750
2014- 4- 9 8.22 0.750
2014- 4-10 2.68 0.750

Clear Skies, Petr [2014-03-03 07:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this one at 01:45 UT.
Don [2014-03-01 02:57, Sugarloaf] Message sent to observers

· I did a run on this last night and plan to start another tonight at 02:00 UT.
Don [2014-02-27 01:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Got a nine hour run from Prompt last night under good conditions. Joe [2012-08-20 18:51, Dark Sky & PROMPT] Message sent to observers

· Currently observing under good conditions with Prompt. Hope to get primary at 0510 UT. Joe and Zach [2012-07-17 00:28, Dark Sky & PROMPT]

· Observed on 7/14-15 (56123) 0610-1030 UT with Prompt. Secondary event at 0704 recorded. Joe and Zach. [2012-07-16 22:46, Dark Sky & PROMPT] Message sent to observers

· Joe Pollock and Zach Vanderplate observed this one with Prompt on three nights:
http://www.asu.cas.cz/~asteroid/03309_12_porb.png
http://www.asu.cas.cz/~asteroid/03309_12_p1.png

Monitoring the mutual events will be useful for refining the model we published in Pravec et al. (2012a); events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 7- 9 12.52 0.245
2012- 7-10 6.98 0.245
2012- 7-11 1.44 0.245
2012- 7-11 19.90 0.245
2012- 7-12 14.36 0.245
2012- 7-13 8.82 0.245
2012- 7-14 3.28 0.245
2012- 7-14 21.74 0.245
2012- 7-15 16.20 0.245
2012- 7-16 10.66 0.245
2012- 7-17 5.12 0.245
2012- 7-17 23.58 0.245
2012- 7-18 18.04 0.245
2012- 7-19 12.50 0.245
2012- 7-20 6.96 0.245
2012- 7-21 1.42 0.245
2012- 7-21 19.88 0.245
2012- 7-22 14.34 0.245
2012- 7-23 8.80 0.245
2012- 7-24 3.26 0.245
2012- 7-24 21.72 0.245
2012- 7-25 16.18 0.245
2012- 7-26 10.64 0.245
2012- 7-27 5.10 0.245
2012- 7-27 23.56 0.245
2012- 7-28 18.02 0.245
2012- 7-29 12.48 0.245
2012- 7-30 6.94 0.245
2012- 7-31 1.40 0.245
2012- 7-31 19.86 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2012- 7- 9 21.85 0.750
2012- 7-10 16.31 0.750
2012- 7-11 10.77 0.750
2012- 7-12 5.23 0.750
2012- 7-12 23.69 0.750
2012- 7-13 18.15 0.750
2012- 7-14 12.61 0.750
2012- 7-15 7.07 0.750
2012- 7-16 1.53 0.750
2012- 7-16 19.99 0.750
2012- 7-17 14.45 0.750
2012- 7-18 8.91 0.750
2012- 7-19 3.37 0.750
2012- 7-19 21.83 0.750
2012- 7-20 16.29 0.750
2012- 7-21 10.75 0.750
2012- 7-22 5.21 0.750
2012- 7-22 23.67 0.750
2012- 7-23 18.13 0.750
2012- 7-24 12.59 0.750
2012- 7-25 7.05 0.750
2012- 7-26 1.51 0.750
2012- 7-26 19.97 0.750
2012- 7-27 14.43 0.750
2012- 7-28 8.89 0.750
2012- 7-29 3.35 0.750
2012- 7-29 21.81 0.750
2012- 7-30 16.27 0.750
2012- 7-31 10.73 0.750

Clear Skies, Petr [2012-07-10 04:57, Ondrejov]

· Observed this returning binary on three recent nights (56098, 56102, 56103)with Prompt. Nine hour runs under good conditions. Joe [2012-06-25 17:51, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

· Observed this returning binary from May target list with Prompt from 0615-1015 UT. Joe [2012-05-19 14:42, Dark Sky & PROMPT] Message sent to observers

· Great data for this binary taken from Ondrejov, Modra, Sonoita, Simeiz and PROMPT in its 3rd apparition during Dec-Oct. The events showed a good evolution, with total occultations+eclipses seen in October and then the viewing/illumination geometry moving gradually away from the mutual orbit plane, resulting eventually in only one of the two kinds of events (occultations or eclipses) occuring in December. See
http://www.asu.cas.cz/~asteroid/03309_10a_porb.png
http://www.asu.cas.cz/~asteroid/03309_10a_p1.png
http://www.asu.cas.cz/~asteroid/03309_10b_porb.png
http://www.asu.cas.cz/~asteroid/03309_10b_p1.png
http://www.asu.cas.cz/~asteroid/03309_10c_porb.png
http://www.asu.cas.cz/~asteroid/03309_10c_p1.png
http://www.asu.cas.cz/~asteroid/03309_10d_porb.png
http://www.asu.cas.cz/~asteroid/03309_10d_p1.png

The data we have got during the three apparitions are going to be great data for orbit modeling, which we'll turn to shortly.

Cheers, Petr [2011-01-04 10:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying to observe this one tonight, conditions are still good. Jozef, Stefan. [2010-12-04 16:57, Modra]

· Just began (0040 UT) observing 3309 Brorfelde from Prompt. Hope to cover 0.245 phase event centered at 0212 UT Joe [2010-12-04 00:43, Dark Sky & PROMPT] Message sent to observers

· Data taken by Adrian and Leos from Modra and by Kamil and Peter from here during 2010-10-28 to 11-09 have shown an expected evolution of the mutual events, see
http://www.asu.cas.cz/~asteroid/03309_10b_porb.png
http://www.asu.cas.cz/~asteroid/03309_10b_p1.png
http://www.asu.cas.cz/~asteroid/03309_10a_porb.png
http://www.asu.cas.cz/~asteroid/03309_10a_p1.png

Further monitoring during the next lunation should complete this 3rd apparition. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010-11-25 15.14 0.245
2010-11-26 9.60 0.245
2010-11-27 4.06 0.245
2010-11-27 22.52 0.245
2010-11-28 16.98 0.245
2010-11-29 11.44 0.245
2010-11-30 5.90 0.245
2010-12- 1 0.36 0.245
2010-12- 1 18.82 0.245
2010-12- 2 13.28 0.245
2010-12- 3 7.74 0.245
2010-12- 4 2.20 0.245
2010-12- 4 20.66 0.245
2010-12- 5 15.12 0.245
2010-12- 6 9.58 0.245
2010-12- 7 4.04 0.245
2010-12- 7 22.50 0.245
2010-12- 8 16.96 0.245
2010-12- 9 11.42 0.245
2010-12-10 5.88 0.245
2010-12-11 0.34 0.245
2010-12-11 18.80 0.245
2010-12-12 13.26 0.245
2010-12-13 7.72 0.245
2010-12-14 2.18 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2010-11-25 5.99 0.750
2010-11-26 0.45 0.750
2010-11-26 18.91 0.750
2010-11-27 13.37 0.750
2010-11-28 7.83 0.750
2010-11-29 2.29 0.750
2010-11-29 20.75 0.750
2010-11-30 15.21 0.750
2010-12- 1 9.67 0.750
2010-12- 2 4.13 0.750
2010-12- 2 22.59 0.750
2010-12- 3 17.05 0.750
2010-12- 4 11.51 0.750
2010-12- 5 5.97 0.750
2010-12- 6 0.43 0.750
2010-12- 6 18.89 0.750
2010-12- 7 13.35 0.750
2010-12- 8 7.81 0.750
2010-12- 9 2.27 0.750
2010-12- 9 20.73 0.750
2010-12-10 15.19 0.750
2010-12-11 9.65 0.750
2010-12-12 4.11 0.750
2010-12-12 22.57 0.750
2010-12-13 17.03 0.750
2010-12-14 11.49 0.750

Clear Skies, Petr [2010-11-18 12:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 30/31.10 in variable sky conditions. The phase 0.745 covered. Leos [2010-10-31 13:02, Modra] Message sent to observers

· I will try to cover 0.745 phase event tonight (for the second time in this lunation) if weather hold. Best wishes, Kamil [2010-10-30 10:17, Ondrejov]

· Observing again. Adrian [2010-10-28 23:13, Modra] Message sent to BinAstPhotSurvey conference

· I plan to observe this tonight, but clouds are approaching. Adrian [2010-10-27 18:44, Modra]

· First five nights (linked) were taken for this one in this its 3rd apparition by Kamil and Peter from here:
http://www.asu.cas.cz/~asteroid/03309_10_p1.png
http://www.asu.cas.cz/~asteroid/03309_10_porb.png
Additional two sessions of a slightly lower quality were taken by Don.

This apparition's data are the highest quality ones of all the three we have got for this binary so far, cf. with
http://www.asu.cas.cz/~asteroid/03309_09a_porb.png
http://www.asu.cas.cz/~asteroid/03309_05_porb.png

We plan to continue monitoring the binary throught this apparition Oct-Dec 2010. After completing this apparition, there should be already enough data for working up a model of the binary, that we plan to do later in the winter. We will appreciate your contribution to monitoring the binary; long sessions with errors <=0.01 mag are needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010-10-27 9.75 0.250
2010-10-28 4.21 0.250
2010-10-28 22.67 0.250
2010-10-29 17.13 0.250
2010-10-30 11.59 0.250
2010-10-31 6.05 0.250
2010-11- 1 0.51 0.250
2010-11- 1 18.97 0.250
2010-11- 2 13.43 0.250
2010-11- 3 7.89 0.250
2010-11- 4 2.35 0.250
2010-11- 4 20.81 0.250
2010-11- 5 15.27 0.250
2010-11- 6 9.73 0.250
2010-11- 7 4.19 0.250
2010-11- 7 22.65 0.250
2010-11- 8 17.11 0.250
2010-11- 9 11.57 0.250
2010-11-10 6.03 0.250
2010-11-11 0.49 0.250
2010-11-11 18.95 0.250
2010-11-12 13.41 0.250
2010-11-13 7.87 0.250
2010-11-14 2.33 0.250
2010-11-14 20.79 0.250
2010-11-15 15.25 0.250
2010-11-16 9.71 0.250
2010-11-17 4.17 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010-10-27 0.42 0.745
2010-10-27 18.88 0.745
2010-10-28 13.34 0.745
2010-10-29 7.80 0.745
2010-10-30 2.26 0.745
2010-10-30 20.72 0.745
2010-10-31 15.18 0.745
2010-11- 1 9.64 0.745
2010-11- 2 4.10 0.745
2010-11- 2 22.56 0.745
2010-11- 3 17.02 0.745
2010-11- 4 11.48 0.745
2010-11- 5 5.94 0.745
2010-11- 6 0.40 0.745
2010-11- 6 18.86 0.745
2010-11- 7 13.32 0.745
2010-11- 8 7.78 0.745
2010-11- 9 2.24 0.745
2010-11- 9 20.70 0.745
2010-11-10 15.16 0.745
2010-11-11 9.62 0.745
2010-11-12 4.08 0.745
2010-11-12 22.54 0.745
2010-11-13 17.00 0.745
2010-11-14 11.46 0.745
2010-11-15 5.92 0.745
2010-11-16 0.38 0.745
2010-11-16 18.84 0.745

Clear Skies, Petr [2010-10-19 08:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 03:00 UT.
Don [2010-10-17 03:40, CarbuncleHill]

· Observing from 20 UT. Peter K. [2010-10-12 20:05, Ondrejov] Message sent to observers

· Observing from 20 UT and should get 8-hours long run tonight. Peter K. [2010-10-11 20:36, Ondrejov]

· I will start this one at 2:25 UT for about 2 hours. Best wishes, Kamil [2010-10-11 00:00, Ondrejov] Message sent to observers

· I will start this one at 23:35; should cover full event. Best wishes, Kamil [2010-10-09 22:11, Ondrejov]

· Starting this binary in this appariton at 22:40 UT. Best wishes, Kamil [2010-10-07 22:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done for the 2nd apparition. [2009-04-07 11:28, Ondrejov]

· Observation after 22 UT. Local clouds still "in touch". Adrian [2009-04-01 23:53, Modra] Message sent to observers

· Observing this one from 19:04 UT. Best wishes, Kamil [2009-03-31 19:04, Ondrejov]

· Observing this one from 19:00 UT. Best wishes, Kamil [2009-03-30 19:06, Ondrejov] Message sent to observers

· Observing this one from 18:57 UT. Best wishes, Kamil [2009-03-21 19:53, Ondrejov]

· Brian has observed the return Hungaria binary on seven nights 2009-01-28 to 02-03, and he got a perfect solution, in agreement with data from the 2005 discovery apparition. Estimates for the parameters from his data:
P_1 = 2.5048 +/- 0.0003 h
P_orb = 18.46 +/- 0.01 h
D_2/D_1 = 0.25 +/- 0.02
A_1 = 0.11 mag
http://www.asu.cas.cz/~asteroid/03309_09_p1.png
http://www.asu.cas.cz/~asteroid/03309_09_porb.png
http://www.asu.cas.cz/~asteroid/03309_09_porb_contacts.png
The current data, like the 2005 data, show total events. A difference is that now we apparently see just one type of events, occultations or eclipses, but not both, while in 2005 we saw (at lower solar phases) both events together; note the deeper primary minimum in the last plot:
http://www.asu.cas.cz/~ppravec/3309_shortpc.png
http://www.asu.cas.cz/~ppravec/3309_longpc.png

The Brian's data from the present apparition establish the solution well and no more data are currently needed. In the next lunation, a few more nights covering events would be useful; so far we have got observational arcs 9 and 6 days only in 2005 and 2009, respectively, and prolonging the arc with a few more sessions (with errors <=0.02 mag and covering whole events) in the next lunation would facilitate future modeling. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 2-15 15.38 0.250
2009- 2-16 9.84 0.250
2009- 2-17 4.30 0.250
2009- 2-17 22.76 0.250
2009- 2-18 17.22 0.250
2009- 2-19 11.68 0.250
2009- 2-20 6.14 0.250
2009- 2-21 0.60 0.250
2009- 2-21 19.06 0.250
2009- 2-22 13.52 0.250
2009- 2-23 7.98 0.250
2009- 2-24 2.44 0.250
2009- 2-24 20.90 0.250
2009- 2-25 15.36 0.250
2009- 2-26 9.82 0.250
2009- 2-27 4.28 0.250
2009- 2-27 22.74 0.250
2009- 2-28 17.20 0.250
2009- 3- 1 11.66 0.250
2009- 3- 2 6.12 0.250
2009- 3- 3 0.58 0.250
2009- 3- 3 19.04 0.250
2009- 3- 4 13.50 0.250
2009- 3- 5 7.96 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2009- 2-15 6.14 0.750
2009- 2-16 0.60 0.750
2009- 2-16 19.06 0.750
2009- 2-17 13.52 0.750
2009- 2-18 7.98 0.750
2009- 2-19 2.44 0.750
2009- 2-19 20.90 0.750
2009- 2-20 15.36 0.750
2009- 2-21 9.82 0.750
2009- 2-22 4.28 0.750
2009- 2-22 22.74 0.750
2009- 2-23 17.20 0.750
2009- 2-24 11.66 0.750
2009- 2-25 6.12 0.750
2009- 2-26 0.58 0.750
2009- 2-26 19.04 0.750
2009- 2-27 13.50 0.750
2009- 2-28 7.96 0.750
2009- 3- 1 2.42 0.750
2009- 3- 1 20.88 0.750
2009- 3- 2 15.34 0.750
2009- 3- 3 9.80 0.750
2009- 3- 4 4.26 0.750
2009- 3- 4 22.72 0.750
2009- 3- 5 17.18 0.750

Clear Skies, Petr [2009-02-04 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is already too faint for most or all of us to get follow-up observations with errors <0.02 mag needed for it, and we are busy with our other targets anyway, so I am closing this one. The results are planned to be given in a joint paper for Planetary and Space Science with a few other Hungaria binaries (including 5477, which is still worked).

Cheers, Petr [2005-11-28 16:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· The binary discovery report by Brian et al. issued on CBET 279 yesterday; copied below. Re. possible follow up observations in the next lunation: The asteroid will be about V=16.5 after the full moon. A few of us might be still able to get an accuracy of <0.02 mag needed for this one, so I don't call this one as finished yet. But other urgent target may keep us busy, so we will see if there will be a good opportunity to follow up this one or not.

Note on this added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr

Electronic Telegram No. 279
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html

(3309) BRORFELDE
B. D. Warner, Palmer Divide Observatory, Colorado Springs; P.
Pravec and P. Kusnirak, Ondrejov Observatory; W. Cooney, J. Gross,
and D. Terrell, Sonoita Research Observatory, Sonoita, AZ; and S.
Nudds, Elginfield Observatory, University of Western Ontario,
report that photometric observations obtained from Oct. 25 to Nov.
3 show that the minor planet (3309) is a binary system with an
orbital period of 18.48 ± 0.01 hr. The primary rotates with a
period of 2.5041 ± 0.0002 hr, and its lightcurve amplitude of 0.09
mag indicates a nearly spheroidal shape. Mutual eclipse/occultations
events that are 0.07-0.15 mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.26 ± 0.02. Calibrated data gives an
estimated absolute magnitude H_R = 13.4 ± 0.2, assuming G = 0.15
± 0.2.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2005 CBAT
2005 November 7 (CBET 279) Daniel W. E. Green [2005-11-08 14:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data by Walt, John and Dirk from SRO of 2005-10-31.3 have covered most of the secondary event, so almost all orbital phases have been covered twice. (The only thing that has been covered just once is the decreasing branch of the secondary event. It doesn't affect our current basic solution in a significant way, so we can go ahead and publish this one. If someone gets to follow up this one (not busy with other targets) during following nights, a coverage of the missing part would bring particularly useful data for future orbit modeling.)

The current solution:
http://www.asu.cas.cz/~ppravec/3309_all.png
http://www.asu.cas.cz/~ppravec/3309_longpc.png
http://www.asu.cas.cz/~ppravec/3309_shortpc.png
Estimated parameters are:
Pprim= 2.5040 ±0.0001 h
Porb = 18.48 ±0.01 h
Ds/Dp= 0.26 ± 0.02
Aprim= 0.09 mag.

The discovery phase is over for this one. We (Brian et al.) will write a discovery report on it to a circular.

Great work, Brian et al.!

Cheers, Petr Pravec [2005-11-03 08:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Calibrated data by Peter K. brought an estimate of H_R=13.4 (error <0.2) assuming G=0.15 +/-0.2 for the asteroid. The MPC's H of 13.9 is consistent with the H_R estimate.

Cheers, Petr [2005-11-02 14:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· This binary has been worked in a smaller group (PDO, Ondrejov, UWO, SRO) so far, but I thought it would be good to mention the results here as well. As you can read below, just a second good night with the secondary event is needed to nail the solution down there. Though we may be able to get the data from PDO or Ondrejov in a few days, the weather is uncertain on both stations, so if someone else could help out (a full coverage of the secondary event plus some orbital phases prior and/or after the event with errors <0.02 mag), it should be very useful. An ephemeris for mid-times of the events see below.

Cheers, Petr

Brian and all,

Shannon's data of 2005-10-31.1 fit nicely with the other data, see the current solution on
http://www.asu.cas.cz/~ppravec/3309_all.png
http://www.asu.cas.cz/~ppravec/3309_longpc.png
http://www.asu.cas.cz/~ppravec/3309_shortpc.png
Estimated parameters are:
Pprim= 2.5044 ±0.0002 h
Porb = 18.47 ±0.01 h
Ds/Dp= 0.25 ± 0.03
Aprim= 0.09 mag.

As I wrote yesterday (see below), just one more coverage of the secondary event is needed for this binary, to nail the solution there. After that, we will publish the discovery on a circular.

Cheers, Petr

I wrote on Nov 1:

> So, the only anomaly remaining there is the brighter second half of the data from the past night 10-31.9. As I wrote earlier today (see below), those points are suspected to be an observational problem, but one more coverage of the secondary event is needed anyway, since we have got just one
> well covered secondary event so far. Other orbital phases are not so critical. Here is an ephemeris
> for the secondary events:
>
> Date/Time UTC (LTc.) Phase
> --------------------------
> 2005-11- 1 18.57 0.750
> 2005-11- 2 13.04 0.750
> 2005-11- 3 7.51 0.750
> 2005-11- 4 1.98 0.750
> 2005-11- 4 20.45 0.750
> 2005-11- 5 14.92 0.750
> 2005-11- 6 9.39 0.750
> 2005-11- 7 3.86 0.750
> 2005-11- 7 22.33 0.750
> 2005-11- 8 16.80 0.750
> 2005-11- 9 11.27 0.750
>
>
> Petr
> [2005-11-02 10:05, Ondrejov] Message sent to BinAstPhotSurvey conference

(3446) Combes (Finished) [Add new note]
· This new target was observed by Don Pray and by Bruno Christmann: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03446.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-04-30 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this new target on April 1+2.
Don [2019-04-03 00:42, Sugarloaf]

(21028) 1989 TO (Finished) - Paired Asteroid [Add new note]
· Done for this apparition. Petr [2019-04-16 13:37, Ondrejov]

· I got good data covering the 3.7h period at 13UT, 03/08 to compliment Don's. [2019-03-09 00:55, Blue Mountains Obs] Message sent to observers

· Doing this one tonight for the Mar. lunation. Hopefully, clouds will hold off long enough. [2019-03-01 01:08, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This one is finished for the 2nd apparition. We'll attempt to model it after taking data in 3rd apparition. Petr [2015-01-07 14:54, Ondrejov]

· I started this at 23:00, Dec 15 UT. Field is very crowded.
Don [2014-12-16 04:02, Sugarloaf] Message sent to observers

· Started a run at 02:10 UT. Crowded fields make getting a complete lc difficult for this one. [2014-11-21 02:17, Sugarloaf]

· In the few hours available before clouds roll in, I'm doing this one and might get a full revolution.

Don [2014-11-19 22:34, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this at 00:50 UT.
Don [2014-11-19 02:35, Sugarloaf] Message sent to observers

· Great work Bob on this one now.
http://www.asu.cas.cz/~asteroid/021028_2014b.png
http://www.asu.cas.cz/~asteroid/021028_2014a.png

This is sufficient data for now. Taking more observations in November will be useful.

Clear Skies, Petr [2014-10-07 07:54, Ondrejov]

· Observed this asteroid over past two nights. [2014-10-06 14:03, Santana] Message sent to observers

· Don Pray has done this one sufficiently for this lunation:
http://www.asu.cas.cz/~asteroid/021028_b4.png

Taking more data in October will be useful for future modeling.

Clear Skies, Petr [2014-09-18 08:08, Ondrejov]

· Plan to start this at 01:50 UT. This should finish this target.
Don [2014-09-17 01:15, Sugarloaf] Message sent to observers

· I started this new target at 02:10 UT.
Don [2014-09-15 03:31, Sugarloaf] Message sent to BinAstPhotSurvey conference

· To be continue-1989 TO, observed from 18:08 UT to 00:27 UT, December 29/30. Gabo [2007-12-30 01:08, SkalnatePleso] [Remove]
Message sent to observers

· More data by Brian from PDO didn't show anything more suspicious. As the few deviated points in the Dec. 18 session were marginal, at the nominal detection limit of the Survey, we will not pursue it more and close it for the Survey now.

Petr [2007-12-21 10:47, Ondrejov]

· After we closed this one with observations from Skalnate Pleso that showed no significant deviation from the single periodicity of 3.66 h, Brian Warner has written that he has (coincidentally) chosen the favorable object as a target in his own program as well. He has taken two nights so far. His 2nd night fits with the Skalnate Pleso data well, except the first six points that are decreased by 0.04 mag (i.e., just at the nominal detection limit of the BinAstPhotSurvey), see
http://www.asu.cas.cz/~asteroid/21028.png
http://www.asu.cas.cz/~asteroid/21028_pdo_071218.png
There is no observational problem with the first six points, so the asteroid is a binary suspect (though marginal, in the sense that the apparent decrease is just at the Survey's limit). Brian's first night shows some deviations as well, but I don't understand them yet.

More observations are needed to confirm the binary suspect. Given the low depth of the apparent attenuation, data with errors not greater than 0.01 mag are needed. Long sessions in good conditions are needed; don't bother in poorer conditions. Given that the Skalnate Pleso data didn't capture an attenuation, its period may be relatively long (but perhaps not extremely long, as most of the Skalnate Pleso sessions were only half nights or so).

Clear Skies, Petr [2007-12-18 16:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been done by Gabo, Michal and Marek from Skalnate Pleso: unique solution, multiple coverage, no deviation above the nominal detection limit of the Survey. It is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2007-12-17 10:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 23:45 UT in good conditions. Michal [2007-12-16 00:33, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 21:00 UT in good conditions at the moment. Michal [2007-12-14 21:15, SkalnatePleso] [Remove]

· Observing from 17:10 UT in average conditions. Michal [2007-12-06 17:11, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 20:45 UT in good conditions.Plan to finish at 00:00 UT. Michal [2007-12-05 20:48, SkalnatePleso] [Remove]

· This object observed from 17:26 UT to 18:58 UT, November 29. Gabo [2007-11-29 20:29, SkalnatePleso] [Remove]
Message sent to observers

· The first estimate says about 3.66 h period with 0.14 mag amplitude. [2007-11-29 09:59, SkalnatePleso] [Remove]

· This object observed from 18:15 UT to 02:10 UT, November 28/29. Gabo [2007-11-29 03:14, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(3764) Holmesacourt (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03764.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-04-03 07:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will observe this starting at 02:40 UT.
Don [2019-04-02 00:28, Sugarloaf]

· Started this one on Mar 27, and plan to observe again tonight, Apr 1, UT.
Don [2019-03-31 23:26, Sugarloaf] Message sent to BinAstPhotSurvey conference

(6843) Heremon (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain, by Marc Deldem, by Bruno Christmann, by Vladimir Benishek from Sopot, and by Arnaud Leroy from Pic du Midi: Reasonable solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06843_2019a.png
http://www.asu.cas.cz/~asteroid/06843_2019b.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-03-29 06:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this again on Mar 13.
Don [2019-03-14 01:39, Sugarloaf]

· I started this on Mar 9.
Don [2019-03-11 13:59, Sugarloaf]

(3673) Levy (Finished) - returning system [Add new note]
· Target closed for the 4th apparition. Petr [2019-03-19 13:42, Ondrejov]

· Romain Montaigut and Arnaud Leroy observed this return binary from OPERA on three nights, captured an event:
http://www.asu.cas.cz/~asteroid/03673_2019a_porb.png
http://www.asu.cas.cz/~asteroid/03673_2019a_p1.png

More data (for both events) with errors < 0.02 mag would useful for refined modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2019- 2-23 11.55 0.252
2019- 2-24 9.23 0.252
2019- 2-25 6.91 0.252
2019- 2-26 4.59 0.252
2019- 2-27 2.27 0.252
2019- 2-27 23.95 0.252
2019- 2-28 21.63 0.252
2019- 3- 1 19.31 0.252
2019- 3- 2 16.99 0.252
2019- 3- 3 14.67 0.252
2019- 3- 4 12.35 0.252
2019- 3- 5 10.03 0.252
2019- 3- 6 7.71 0.252
2019- 3- 7 5.39 0.252
2019- 3- 8 3.07 0.252
2019- 3- 9 0.75 0.252
2019- 3- 9 22.43 0.252
2019- 3-10 20.11 0.252
2019- 3-11 17.79 0.252
2019- 3-12 15.47 0.252
2019- 3-13 13.15 0.252
2019- 3-14 10.83 0.252
2019- 3-15 8.51 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2019- 2-23 0.76 0.755
2019- 2-23 22.44 0.755
2019- 2-24 20.12 0.755
2019- 2-25 17.80 0.755
2019- 2-26 15.48 0.755
2019- 2-27 13.16 0.755
2019- 2-28 10.84 0.755
2019- 3- 1 8.52 0.755
2019- 3- 2 6.20 0.755
2019- 3- 3 3.88 0.755
2019- 3- 4 1.56 0.755
2019- 3- 4 23.24 0.755
2019- 3- 5 20.92 0.755
2019- 3- 6 18.60 0.755
2019- 3- 7 16.28 0.755
2019- 3- 8 13.96 0.755
2019- 3- 9 11.64 0.755
2019- 3-10 9.32 0.755
2019- 3-11 7.00 0.755
2019- 3-12 4.68 0.755
2019- 3-13 2.36 0.755
2019- 3-14 0.04 0.755
2019- 3-14 21.72 0.755
2019- 3-15 19.40 0.755

Clear Skies, Petr [2019-02-17 15:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· We observed this return binary on 3 nights and catch an event.
Romain and Arnaud [2019-02-15 12:23, OPERA]

· Done in the 3rd apparition, starting modeling. [2015-02-02 09:03, Ondrejov]

· I started a run on this at 23:35, Jan 16 UT to record the LC outside of event.
Don [2015-01-16 23:36, Sugarloaf] Message sent to observers

· Started a run at 23:30 , Jan 15 UT to catch the 0.235 phase event.
Don [2015-01-15 23:32, Sugarloaf]

· Doing a run on this to catch the 0.725 phase event at 02.05 UT.
Don [2015-01-11 01:55, Sugarloaf] Message sent to observers

· Data obtained in this apparition so far:
http://www.asu.cas.cz/~asteroid/03673_2014c_porb.png
http://www.asu.cas.cz/~asteroid/03673_2014c_p1.png
http://www.asu.cas.cz/~asteroid/03673_2014b_porb.png
http://www.asu.cas.cz/~asteroid/03673_2014b_p1.png
http://www.asu.cas.cz/~asteroid/03673_2014a_porb.png
http://www.asu.cas.cz/~asteroid/03673_2014a_p1.png

Last data for this apparition would be still useful to take in this month, with errors not greater than 0.02 mag; don't bother in less ideal conditions. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1- 8 20.05 0.235
2015- 1- 9 17.73 0.235
2015- 1-10 15.41 0.235
2015- 1-11 13.09 0.235
2015- 1-12 10.77 0.235
2015- 1-13 8.45 0.235
2015- 1-14 6.13 0.235
2015- 1-15 3.81 0.235
2015- 1-16 1.49 0.235
2015- 1-16 23.17 0.235
2015- 1-17 20.85 0.235
2015- 1-18 18.53 0.235
2015- 1-19 16.21 0.235
2015- 1-20 13.89 0.235
2015- 1-21 11.57 0.235
2015- 1-22 9.25 0.235
2015- 1-23 6.93 0.235
2015- 1-24 4.61 0.235
2015- 1-25 2.29 0.235
2015- 1-25 23.97 0.235
2015- 1-26 21.65 0.235

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1- 8 9.01 0.725
2015- 1- 9 6.69 0.725
2015- 1-10 4.37 0.725
2015- 1-11 2.05 0.725
2015- 1-11 23.73 0.725
2015- 1-12 21.41 0.725
2015- 1-13 19.09 0.725
2015- 1-14 16.77 0.725
2015- 1-15 14.45 0.725
2015- 1-16 12.13 0.725
2015- 1-17 9.81 0.725
2015- 1-18 7.49 0.725
2015- 1-19 5.17 0.725
2015- 1-20 2.85 0.725
2015- 1-21 0.53 0.725
2015- 1-21 22.21 0.725
2015- 1-22 19.89 0.725
2015- 1-23 17.57 0.725
2015- 1-24 15.25 0.725
2015- 1-25 12.93 0.725
2015- 1-26 10.61 0.725

Clear Skies, Petr [2015-01-07 10:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 22:00, Dec 13 UT, and should catch the 0.740 phase event.
Don [2014-12-14 01:16, Sugarloaf] Message sent to observers

· Great data have been obtained for this one by Don Pray from Sugarloaf Mountain in the past lunation, in particular.
http://www.asu.cas.cz/~asteroid/03673_2014b_porb.png
http://www.asu.cas.cz/~asteroid/03673_2014b_p1.png
http://www.asu.cas.cz/~asteroid/03673_2014a_porb.png
http://www.asu.cas.cz/~asteroid/03673_2014a_p1.png

Further monitoring in the next lunation would be useful for future modeling. Errors not greater than 0.02 mag are needed; don't bother in less ideal conditions. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-12-10 0.63 0.236
2014-12-10 22.31 0.236
2014-12-11 19.99 0.236
2014-12-12 17.67 0.236
2014-12-13 15.35 0.236
2014-12-14 13.03 0.236
2014-12-15 10.71 0.236
2014-12-16 8.39 0.236
2014-12-17 6.07 0.236
2014-12-18 3.75 0.236
2014-12-19 1.43 0.236
2014-12-19 23.11 0.236
2014-12-20 20.79 0.236
2014-12-21 18.47 0.236
2014-12-22 16.15 0.236
2014-12-23 13.83 0.236
2014-12-24 11.51 0.236
2014-12-25 9.19 0.236
2014-12-26 6.87 0.236
2014-12-27 4.55 0.236
2014-12-28 2.23 0.236
2014-12-28 23.91 0.236
2014-12-29 21.59 0.236

Date/Time UTC (LTc.) Phase
--------------------------
2014-12- 9 13.88 0.740
2014-12-10 11.56 0.740
2014-12-11 9.24 0.740
2014-12-12 6.92 0.740
2014-12-13 4.60 0.740
2014-12-14 2.28 0.740
2014-12-14 23.96 0.740
2014-12-15 21.64 0.740
2014-12-16 19.32 0.740
2014-12-17 17.00 0.740
2014-12-18 14.68 0.740
2014-12-19 12.36 0.740
2014-12-20 10.04 0.740
2014-12-21 7.72 0.740
2014-12-22 5.40 0.740
2014-12-23 3.08 0.740
2014-12-24 0.76 0.740
2014-12-24 22.44 0.740
2014-12-25 20.12 0.740
2014-12-26 17.80 0.740
2014-12-27 15.48 0.740
2014-12-28 13.16 0.740
2014-12-29 10.84 0.740

Clear Skies, Petr [2014-12-03 10:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· We started this target at ~4hUT at the Perkins telescope (USA).
Audrey [2014-11-21 05:09, Thirouin Audrey] Message sent to observers

· Started a run at 00:15 UT, and hope to catch the 0.242 phase event.
Don [2014-11-19 02:37, Sugarloaf]

· Started a run at 00:25 UT, and will catch the 0.740 event.
Don [2014-11-16 00:27, Sugarloaf] Message sent to observers

· I started a run at 00:20 UT, and hope to catch the 0.740 phase event.
Don [2014-11-15 02:01, Sugarloaf]

· I started a run on this at 00:45 UT,and hope to catch the 0.242 event.
Don [2014-11-11 02:43, Sugarloaf] Message sent to observers

· observed on 11/02 started at 15:21UT but missed the secondary event. [2014-11-06 05:39, Blue Mountains Obs]

· New data by Vladimir Benishek from Belgrade and by Don Pray from Sugarloaf Mountain added:
http://www.asu.cas.cz/~asteroid/03673_2014_porb.png
http://www.asu.cas.cz/~asteroid/03673_2014_p1.png

Covering each of the two events twice in the next lunation would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-10 5.34 0.242
2014-11-11 3.02 0.242
2014-11-12 0.70 0.242
2014-11-12 22.38 0.242
2014-11-13 20.06 0.242
2014-11-14 17.74 0.242
2014-11-15 15.42 0.242
2014-11-16 13.10 0.242
2014-11-17 10.78 0.242
2014-11-18 8.46 0.242
2014-11-19 6.14 0.242
2014-11-20 3.82 0.242
2014-11-21 1.50 0.242
2014-11-21 23.18 0.242
2014-11-22 20.86 0.242
2014-11-23 18.54 0.242
2014-11-24 16.22 0.242
2014-11-25 13.90 0.242
2014-11-26 11.58 0.242
2014-11-27 9.26 0.242
2014-11-28 6.94 0.242
2014-11-29 4.62 0.242
2014-11-30 2.30 0.242
2014-11-30 23.98 0.242
2014-12- 1 21.66 0.242
2014-12- 2 19.34 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-10 16.12 0.740
2014-11-11 13.80 0.740
2014-11-12 11.48 0.740
2014-11-13 9.16 0.740
2014-11-14 6.84 0.740
2014-11-15 4.52 0.740
2014-11-16 2.20 0.740
2014-11-16 23.88 0.740
2014-11-17 21.56 0.740
2014-11-18 19.24 0.740
2014-11-19 16.92 0.740
2014-11-20 14.60 0.740
2014-11-21 12.28 0.740
2014-11-22 9.96 0.740
2014-11-23 7.64 0.740
2014-11-24 5.32 0.740
2014-11-25 3.00 0.740
2014-11-26 0.68 0.740
2014-11-26 22.36 0.740
2014-11-27 20.04 0.740
2014-11-28 17.72 0.740
2014-11-29 15.40 0.740
2014-11-30 13.08 0.740
2014-12- 1 10.76 0.740
2014-12- 2 8.44 0.740

Clear Skies, Petr [2014-11-04 15:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on two nights, Nov. 2 (20:56 - 23:42 UT) and Nov. 3/4 (20:51 - 02:02 UT) at Sopot AO. [2014-11-04 13:13, Sopot AO] Message sent to observers

· I started at 20:40 UT. Zuzana [2014-11-02 20:40, SkalnatePleso] [Remove]

· I'll be starting this at 01:40 UT, and hope to catch the 0.248 phase event.
Don [2014-10-31 01:20, Sugarloaf] Message sent to observers

· Started observing at 21:00 UT. Gabo [2014-10-29 21:00, SkalnatePleso] [Remove]

· I'm planning on starting this at 01:55 UT, and should catch most of the 0.750 phase event.
Don [2014-10-28 01:24, Sugarloaf] Message sent to observers

· Don Pray has taken a few first nights from Sugarloaf Mountain for this return binary in its current 3rd apparition:
http://www.asu.cas.cz/~asteroid/03673_2014_porb.png
http://www.asu.cas.cz/~asteroid/03673_2014_p1.png

More data for both events are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-27 16.26 0.248
2014-10-28 13.94 0.248
2014-10-29 11.62 0.248
2014-10-30 9.30 0.248
2014-10-31 6.98 0.248
2014-11- 1 4.66 0.248
2014-11- 2 2.34 0.248
2014-11- 3 0.02 0.248
2014-11- 3 21.70 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-28 3.13 0.750
2014-10-29 0.81 0.750
2014-10-29 22.49 0.750
2014-10-30 20.17 0.750
2014-10-31 17.85 0.750
2014-11- 1 15.53 0.750
2014-11- 2 13.21 0.750
2014-11- 3 10.89 0.750

Clear Skies, Petr [2014-10-27 15:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 02:00 UT.
Don [2014-10-27 01:46, Sugarloaf] Message sent to observers

· Started at 02:15 UT, and will hopefully catch the 0.256 phase event.
Don [2014-10-25 02:40, Sugarloaf]

· Planning to start this at 02:40 UT.
Don [2014-10-18 00:03, Sugarloaf] Message sent to observers

· I got a run on this on Oct 13 and appear to have caught an event.
Don [2014-10-15 01:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Closed for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Data in the 3rd apparition will be needed for modeling.

Cheers, Petr [2012-04-27 12:47, Ondrejov]

· Good data for both events were taken by Marek Husarik and Michal Pikler from Skalnate Pleso, by Joe Pollock from NC and by Jozef Vilagi and Leos Kornos from Modra in the past lunation:
http://www.asu.cas.cz/~asteroid/03673_12b_porb.png
Cf. with the data from the previous month:
http://www.asu.cas.cz/~asteroid/03673_12a_porb.png

Monitoring the events in the April lunation (which will be the last lunation for this apparition) will be needed for modeling; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4- 9 21.50 0.256
2012- 4-10 19.18 0.256
2012- 4-11 16.86 0.256
2012- 4-12 14.54 0.256
2012- 4-13 12.22 0.256
2012- 4-14 9.90 0.256
2012- 4-15 7.58 0.256
2012- 4-16 5.26 0.256
2012- 4-17 2.94 0.256
2012- 4-18 0.62 0.256
2012- 4-18 22.30 0.256
2012- 4-19 19.98 0.256
2012- 4-20 17.66 0.256
2012- 4-21 15.34 0.256
2012- 4-22 13.02 0.256
2012- 4-23 10.70 0.256
2012- 4-24 8.38 0.256
2012- 4-25 6.06 0.256
2012- 4-26 3.74 0.256
2012- 4-27 1.42 0.256
2012- 4-27 23.10 0.256
2012- 4-28 20.78 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-10 8.41 0.759
2012- 4-11 6.09 0.759
2012- 4-12 3.77 0.759
2012- 4-13 1.45 0.759
2012- 4-13 23.13 0.759
2012- 4-14 20.81 0.759
2012- 4-15 18.49 0.759
2012- 4-16 16.17 0.759
2012- 4-17 13.85 0.759
2012- 4-18 11.53 0.759
2012- 4-19 9.21 0.759
2012- 4-20 6.89 0.759
2012- 4-21 4.57 0.759
2012- 4-22 2.25 0.759
2012- 4-22 23.93 0.759
2012- 4-23 21.61 0.759
2012- 4-24 19.29 0.759
2012- 4-25 16.97 0.759
2012- 4-26 14.65 0.759
2012- 4-27 12.33 0.759
2012- 4-28 10.01 0.759
2012- 4-29 7.69 0.759

Clear Skies, Petr [2012-04-02 10:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from ~18:40UT, expecting full session. Jozef, Leos. [2012-03-20 18:52, Modra]

· The secondary event has been covered well for this lunation with one night by Joe Pollock from NC and one night by Marek Husarik from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/03673_12b_porb.png
cf. with the data from the previous month:
http://www.asu.cas.cz/~asteroid/03673_12a_porb.png
Further monitoring of the secondary event's evolution in April will be useful for modeling.

Observations of the primary event in this lunation are needed (it was last covered on March 3); event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-20 2.92 0.259
2012- 3-21 0.60 0.259
2012- 3-21 22.28 0.259
2012- 3-22 19.96 0.259
2012- 3-23 17.64 0.259
2012- 3-24 15.32 0.259
2012- 3-25 13.00 0.259
2012- 3-26 10.68 0.259
2012- 3-27 8.36 0.259
2012- 3-28 6.04 0.259
2012- 3-29 3.72 0.259
2012- 3-30 1.40 0.259
2012- 3-30 23.08 0.259
2012- 3-31 20.76 0.259
2012- 4- 1 18.44 0.259

Clear Skies, Petr [2012-03-19 12:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 19:40 to 01:40 UT.
Marek [2012-03-17 02:18, SkalnatePleso] [Remove]
Message sent to observers

· Began run with 16" in NC at 0115 UT in good conditions. Hope to get secondary centered at 0339 UT. Joe [2012-03-15 03:05, Dark Sky & PROMPT]

· Observing from 19:00 UT in average conditions. Michal [2012-03-05 20:38, SkalnatePleso] [Remove]
Message sent to observers

· Good data for this one in its current second (first return) apparition by Kamil Hornoch and Jan Vrastil from here, by Don Pray from Sugarloaf Mountain, by Jozef Vilagi, Leos Kornos, Stefan Gajdos and Adrian Galad from Modra, and by Marek Husarik and Michal Pikler from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/03673_12_porb.png
http://www.asu.cas.cz/~asteroid/03673_12_p1.png
Cf. with data from the 2007-8 discovery apparition:
http://www.asu.cas.cz/~asteroid/03673_porb.png
http://www.asu.cas.cz/~asteroid/03673_p1.png

A reasonable coverage for and a behaviour of the primary event, but the secondary event appears to have a non-flat bottom which would indicate that they are partial events, but this needs to be confirmed. More data are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-11 23.76 0.257
2012- 3-12 21.44 0.257
2012- 3-13 19.12 0.257
2012- 3-14 16.80 0.257
2012- 3-15 14.48 0.257
2012- 3-16 12.16 0.257
2012- 3-17 9.84 0.257
2012- 3-18 7.52 0.257
2012- 3-19 5.20 0.257
2012- 3-20 2.88 0.257
2012- 3-21 0.56 0.257
2012- 3-21 22.24 0.257
2012- 3-22 19.92 0.257
2012- 3-23 17.60 0.257
2012- 3-24 15.28 0.257
2012- 3-25 12.96 0.257
2012- 3-26 10.64 0.257
2012- 3-27 8.32 0.257
2012- 3-28 6.00 0.257
2012- 3-29 3.68 0.257
2012- 3-30 1.36 0.257
2012- 3-30 23.04 0.257
2012- 3-31 20.72 0.257
2012- 4- 1 18.40 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-11 12.93 0.758
2012- 3-12 10.61 0.758
2012- 3-13 8.29 0.758
2012- 3-14 5.97 0.758
2012- 3-15 3.65 0.758
2012- 3-16 1.33 0.758
2012- 3-16 23.01 0.758
2012- 3-17 20.69 0.758
2012- 3-18 18.37 0.758
2012- 3-19 16.05 0.758
2012- 3-20 13.73 0.758
2012- 3-21 11.41 0.758
2012- 3-22 9.09 0.758
2012- 3-23 6.77 0.758
2012- 3-24 4.45 0.758
2012- 3-25 2.13 0.758
2012- 3-25 23.81 0.758
2012- 3-26 21.49 0.758
2012- 3-27 19.17 0.758
2012- 3-28 16.85 0.758
2012- 3-29 14.53 0.758
2012- 3-30 12.21 0.758
2012- 3-31 9.89 0.758
2012- 4- 1 7.57 0.758
2012- 4- 2 5.25 0.758

Clear Skies, Petr [2012-03-05 12:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to observe this asteroid tonight. Clouds should gradually disappear. Adrian [2012-03-02 18:34, Modra]

· Observing it from 20:35 UT on Feb.26, 2012.
Stefan [2012-02-26 20:45, Modra]

· Started at 23:30 UT. Jozef, Leos [2012-02-21 23:35, Modra]

· Observing tonight from 00:00 UT. Jozef, Leos [2012-02-21 01:03, Modra]

· Started this at 03:20 UT, and will catch much of the 0.25 phase event and the primary's lc after.
Don [2012-02-20 03:28, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start this at 07:30 UT and should cover much of the 0.75 phase event. Clouds may be moving in during this run.
Don [2012-02-14 01:12, Sugarloaf]

· Planning to start a run on this at 04:40 UT, and will hopefully capture the entire 0.75 phase event. It's 78 degrees from the moon so I might get good data.
Don [2012-02-05 02:31, Sugarloaf] Message sent to BinAstPhotSurvey conference

· First data in this apparition of the binary were taken by Kamil Hornoch from here:
http://www.asu.cas.cz/~asteroid/03673_12_porb.png
http://www.asu.cas.cz/~asteroid/03673_12_p1.png
Cf. with data from the 2008 discovery apparition:
http://www.asu.cas.cz/~asteroid/03673_porb.png
http://www.asu.cas.cz/~asteroid/03673_p1.png

Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 4 20.49 0.250
2012- 2-12 23.52 0.250
2012- 2-13 21.19 0.250
2012- 2-14 18.86 0.250
2012- 2-15 16.53 0.250
2012- 2-16 14.20 0.250
2012- 2-17 11.87 0.250
2012- 2-18 9.54 0.250
2012- 2-19 7.21 0.250
2012- 2-20 4.88 0.250
2012- 2-21 2.55 0.250
2012- 2-22 0.22 0.250
2012- 2-22 21.89 0.250
2012- 2-23 19.56 0.250
2012- 2-24 17.23 0.250
2012- 2-25 14.90 0.250
2012- 2-26 12.57 0.250
2012- 2-27 10.24 0.250
2012- 2-28 7.91 0.250
2012- 2-29 5.58 0.250
2012- 3- 1 3.25 0.250
2012- 3- 2 0.92 0.250
2012- 3- 2 22.59 0.250
2012- 3- 3 20.26 0.250
2012- 3- 4 17.93 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 5 7.32 0.750
2012- 2-13 10.35 0.750
2012- 2-14 8.02 0.750
2012- 2-15 5.69 0.750
2012- 2-16 3.36 0.750
2012- 2-17 1.03 0.750
2012- 2-17 22.70 0.750
2012- 2-18 20.37 0.750
2012- 2-19 18.04 0.750
2012- 2-20 15.71 0.750
2012- 2-21 13.38 0.750
2012- 2-22 11.05 0.750
2012- 2-23 8.72 0.750
2012- 2-24 6.39 0.750
2012- 2-25 4.06 0.750
2012- 2-26 1.73 0.750
2012- 2-26 23.40 0.750
2012- 2-27 21.07 0.750
2012- 2-28 18.74 0.750
2012- 2-29 16.41 0.750
2012- 3- 1 14.08 0.750
2012- 3- 2 11.75 0.750
2012- 3- 3 9.42 0.750
2012- 3- 4 7.09 0.750
2012- 3- 5 4.76 0.750

Clear Skies, Petr [2012-02-04 10:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one tonight, best wishes, Kamil [2012-02-03 22:54, Ondrejov]

· Final solution from the completed dataset:

P_1 = 2.68745 ± 0.00004 h
A_1 = 0.13 mag
P_orb = 21.67 ± 0.01 h
D_2/D_1 = 0.27 ± 0.03
H_R = 12.65 ± 0.06, G = 0.28 ± 0.08
http://www.asu.cas.cz/~asteroid/03673_all.png
http://www.asu.cas.cz/~asteroid/03673_porb.png
http://www.asu.cas.cz/~asteroid/03673_p1.png

It is given in the summary list as well.

Cheers, Petr [2008-02-19 10:30, Ondrejov]

· Observing it from 17:09 UT on Jan.8, 2008. Again, more stars are ahead.

Stefan [2008-01-08 19:22, Modra] Message sent to BinAstPhotSurvey conference

· I will try to catch the secondary event this evening, but the weather is uncertain... Best wishes, Kamil [2008-01-07 16:45, Ondrejov] Message sent to observers

· Kamil and Peter have covered the secondary event from here on the last night. The event is narrowing in agreement with expectation for the decreasing solar phase. P_orb has been nailed down reasonably. For D_2/D_1 estimation, we use depths of the captured secondary events. Two of the three observed secondary events fit mutually very well (Kamil&Peter's one of Dec. 18.9 and the Don's one of Dec. 7.3), but the third one (Dec. 5.3) shows a slightly greater depth by a couple 0.01 mag. There is no obvious physical explanation for that, so at this time I assume that the slightly greater depth of the Dec. 5.3 event is an observational artifact; the D_2/D_1 estimate given below is based on the other two observed events of Dec. 7.3 and 18.9. It would be good, however, to confirm it with one more good data for the secondary event. I give an updated ephemeris for events below. Good long sessions are needed; don't bother in poorer conditions or when you could cover only a part of the event.
P_1 = 2.6873 +/- 0.0001 h
A_1 = 0.13 mag
P_orb = 21.665 +/- 0.01 h
D_2/D_1 = 0.25 +/- 0.02
http://www.asu.cas.cz/~asteroid/03673_all.png
http://www.asu.cas.cz/~asteroid/03673_porb.png
http://www.asu.cas.cz/~asteroid/03673_p1.png

Date/Time UTC (LTc.) Phase
--------------------------
2007-12-20 6.20 0.255
2007-12-21 3.86 0.255
2007-12-22 1.53 0.255
2007-12-22 23.19 0.255
2007-12-27 11.52 0.255
2007-12-28 9.18 0.255
2007-12-29 6.85 0.255
2007-12-30 4.51 0.255
2007-12-31 2.18 0.255
2007-12-31 23.84 0.255
2008- 1- 1 21.51 0.255
2008- 1- 2 19.17 0.255
2008- 1- 3 16.84 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2007-12-19 19.48 0.760
2007-12-20 17.15 0.760
2007-12-21 14.81 0.760
2007-12-22 12.48 0.760
2007-12-27 0.80 0.760
2007-12-27 22.47 0.760
2007-12-28 20.13 0.760
2007-12-29 17.80 0.760
2007-12-30 15.46 0.760
2007-12-31 13.13 0.760
2008- 1- 1 10.79 0.760
2008- 1- 2 8.46 0.760
2008- 1- 3 6.12 0.760

Cheers, Petr [2007-12-19 10:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 18:30 UT. I will try to catch the secondary event if weather permit. Best wishes, Kamil [2007-12-18 19:03, Ondrejov] Message sent to observers

· Doing a run on this tonight through thin cloud and occasional wind. Hopefully, I'll catch the secondary event.
Don [2007-12-15 04:41, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don's session of Dec. 13.2 joined in. Updated solution:
P_1 = 2.6877 +/- 0.0003 h
A_1 = 0.13 mag
P_orb = 21.7 h
D_2/D_1 = 0.28
http://www.asu.cas.cz/~asteroid/03673_all.png
http://www.asu.cas.cz/~asteroid/03673_porb.png
http://www.asu.cas.cz/~asteroid/03673_p1.png
P_orb and D_2/D_1 not nailed down yet, more data are still needed. Ephemeris for events:

Date/Time UTC (LTc.) Phase
--------------------------
2007-12-14 20.39 0.250
2007-12-15 18.09 0.250
2007-12-16 15.79 0.250
2007-12-17 13.49 0.250
2007-12-18 11.19 0.250
2007-12-19 8.89 0.250
2007-12-20 6.59 0.250
2007-12-21 4.29 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007-12-15 7.46 0.760
2007-12-16 5.16 0.760
2007-12-17 2.86 0.760
2007-12-18 0.56 0.760
2007-12-18 22.26 0.760
2007-12-19 19.96 0.760
2007-12-20 17.66 0.760
2007-12-21 15.36 0.760

Clear Skies, Petr [2007-12-14 10:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement on this one has appeared yesterday evening, its text copied below for your convenience. I'm going to update our web pages accordingly.

Cheers, Petr

(3673) LEVY
D. Pray, Carbuncle Hill Observatory, Greene, RI, U.S.A.; P. Pravec and P.
Kusnirak, Ondrejov Observatory; and R. Stephens, Goat Mountain Astronomical
Research Station, Yucca Valley, CA, U.S.A., report that photometric
observations obtained during Dec. 5-9 reveal that minor planet (3673) is a
binary system with an orbital period of 21.6 hr. The primary shows a period
of 2.6879 ± 0.0005 hr, and it has a lightcurve amplitude of 0.13 mag,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events
indicate a secondary-to-primary mean-diameter ratio of 0.28 ± 0.03. The
system's parameters need to be refined with further observations.

2007 December 12 (CBET 1165) Daniel W. E. Green [2007-12-13 09:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start a run on this at 01:45 UT.
Don [2007-12-13 00:54, CarbuncleHill]

· Bob's data from GMARS of Dec. 8.4 are nailing down the solution. It is mostly well established now:
P_1 = 2.6879 +/- 0.0006 h
A_1 = 0.13 mag
P_orb = 21.6 h (error <0.1 h)
D_2/D_1 = 0.28
http://www.asu.cas.cz/~asteroid/03673_all.png
http://www.asu.cas.cz/~asteroid/03673_porb.png
http://www.asu.cas.cz/~asteroid/03673_p1.png
If Don's last night run which is about over now is successfull, he should have captured a part of the primary event before end of his session about 10 UT.

Ok, we will wait for Don's latest data, but if we go with the two-level announcement strategy we have discussed a couple weeks ago, we could do the 1st level announcement now. The solution needs to be nailed down and refined with more data, so a 2nd-level announcement may follow fairly soon; giving that this one has a relatively short orbital period and northern hemisphere stations can take long sessions for it during these nights, reaching the full quality level for regular ("2nd level") announcement may be reached in a few days. For the regular ("2nd level") announcement, it would be needed to cover each of the two events once more and complete coverage of the orbit outside events, to nail down and refine P_orb and D_2/D_1. I will discuss with Don, the discoverer of this one, whether we do the 1st level announcement now or wait a few days and do a full regular announcement then. In any case, keep taking more observations in the meantime.

Cheers, Petr [2007-12-09 12:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 02:00 UT.
Don [2007-12-08 22:22, CarbuncleHill]

· Got a run in from about 05:00 to 13:00 UT 2007-12-08. Appear to have caught an event. Data sent to Petr. [2007-12-08 16:25, Santana] Message sent to observers

· Will start a run from GMARS about 4:00 UT [2007-12-08 03:13, Santana]

· Don has found this one to be a binary candidate. Solution is still a bit weak, more data are needed. P_1 is probably unique: 2.687 h, ampl. 0.13 mag. Several possible values for P_orb. (The plots below are done for one of the possible solutions.) A preliminary estimate for D_s/D_p is 0.25.
http://www.asu.cas.cz/~asteroid/03673_all.png
http://www.asu.cas.cz/~asteroid/03673_porb.png
http://www.asu.cas.cz/~asteroid/03673_p1.png
Good long sessions are needed to establish it.

Cheers, Petr [2007-12-07 17:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting a run on this at 02:15 UT.
Don [2007-12-07 01:04, CarbuncleHill]

· I plan to start a run on this at 02:25 UT.
Don [2007-12-05 02:02, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'm starting this new target tonight.
Don [2007-12-01 02:15, CarbuncleHill]

(49911) XT169 (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and by Walt Cooney from Starry Night Observatory: http://www.asu.cas.cz/~asteroid/49911.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-03-10 07:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work from Columbus, TX tonight. -Walt [2019-02-13 00:48, Sonoita] Message sent to observers

· Observed this on Feb 10.
Don [2019-02-10 20:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

(16815) 1997 UA9 (Finished) - Paired Asteroid [Add new note]
· Target closed for this apparition. Petr [2019-03-06 07:10, Ondrejov]

· Doing a run on this one for the March lunation.
Don [2019-03-01 01:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Doing this one tonight for the Feb. lunation.
Don [2019-02-10 00:09, Sugarloaf]

· Doing this tonight for the Jan apparition.
Don [2019-01-16 01:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this paired asteroid at 04:10 UT., Dec 5.
Don [2018-12-05 00:00, Sugarloaf]

· Done for this apparition. [2017-12-04 07:45, Ondrejov]

· observed for this lunation last night 10/12 [2017-10-13 08:44, Blue Mountains Obs] Message sent to observers

· Start a new paired asteroid. Will do a period per lunation. [2017-09-16 22:07, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observing this one from 18:00 UT; should cover one full period (~3hr) which should be sufficient for now. Then we will try to finish coverage of (4905)Hiromi for this lunation, if weather holds. Best wishes, Kamil and Honza [2015-02-15 18:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done for the 2nd apparition. Petr [2015-02-12 07:49, Ondrejov]

· I'll be starting this after 8116.
Don [2015-02-11 03:00, Sugarloaf] Message sent to observers

· Planning to start this at 04:40 UT.
Don [2015-01-23 02:12, Sugarloaf] Message sent to BinAstPhotSurvey conference

· The primary of the pair 16815-2011GD83 was done by Don Pray from Sugarloaf Mountain on five partial nights and from here on one partial night: Unique period, good coverage, no deviation seen.
http://www.asu.cas.cz/~asteroid/016815.png
Closed.

Cheers, Petr [2013-10-02 15:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this around 04:00 UT. Period is a little under 3 hours.
Don [2013-09-29 23:45, Sugarloaf]

· I did a run on this new target on Sept 28. Could be a fast rotator.
Don [2013-09-28 19:30, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3040) Kozai (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03040.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-03-01 06:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this on Feb 1.
Don [2019-02-02 00:43, Sugarloaf]

(4148) McCartney (Finished) [Add new note]
· Bruno Christmann observed this new target on four nights, got a good solution with a longish period of 20.75 h.
http://www.asu.cas.cz/~asteroid/04148.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2019-02-18 08:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began this new list object from Dark Sky at 0130 UT. Hope to get about 9 hours. This is the only remaining asteroid from the Beatles (4147 Lennon, 4149 Harrison and 4150 Starr) with an unknown rotation period. Joe [2019-02-03 01:53, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(1608) Munoz (Finished) [Add new note]
· Vladimir Benishek observed this return "prime suspect" from Sopot on 2 nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01608_b9.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-02-17 15:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Feb. 15-16, 17:49-02:42 UT.
Vladimir [2019-02-16 17:32, Sopot AO]

· I observed this returning "prime suspect" on Feb. 07-08, 19:37-03:41 UT.
Vladimir [2019-02-08 15:24, Sopot AO] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek did this new target from Sopot on three nights: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01608.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good, fast work Vladimir.

Cheers, Petr [2017-09-16 12:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed on Sep. 13-14, Sep. 14-15 and Sep. 15-16 UT.
Vladimir [2017-09-16 11:57, Sopot AO]

(6818) Sessyu (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Reasonable solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06818.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-02-11 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one Feb 2. It looks like a fast rotator.
Don [2019-02-03 02:19, Sugarloaf]

(11852) Shoumen (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/11852.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-02-10 06:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target observed on Feb. 07-08, 17:51-04:11 UT.
Vladimir [2019-02-08 15:30, Sopot AO]

(1814) Bach (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01814.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-02-08 07:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this on Feb 1. [2019-02-02 00:42, Sugarloaf]

(18736) 1998 NU (Finished) [Add new note]
· Extensive follow-up observations by Don Pray from Sugarloaf Mountain, by Bruno Christmann, by Vladimir Benishek from Sopot, by Russ Durkee from Shed of Science South, and by Romain Montaigut and Arnaud Leroy from OPERA did not capture any more attenuation. So, this suspect remains unconfirmed.
http://www.asu.cas.cz/~asteroid/18736.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort all!

Petr [2019-02-07 13:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:00, Feb 1 UT.
Don [2019-02-01 02:09, Sugarloaf]

· Started this at 23:55, Jan 25 UT.
Don [2019-01-25 23:55, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Just Starting this one at 2:10 UT 1/25. Conditions appear good for the next 4 or 5 hours.

Russ [2019-01-25 02:12, Shed of Science] Message sent to observers

· Started a run at 18:20 UT.
Vladimir [2019-01-17 19:05, Sopot AO] Message sent to BinAstPhotSurvey conference

· Don Pray observed this new target on two nights, captured an apparent attenuation; a tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/18736_2019a_p1.png
http://www.asu.cas.cz/~asteroid/18736_2019a_porb.png
(The period in the second plot was set just for plotting purpose; no P_orb has been actually estimated.)

As his weather is unstable, Don would appreciate a help with this one.

Clear Skies, Petr [2019-01-17 14:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this new target on Jan 16, and am doing a run tonight, Jan 17.
Don [2019-01-17 02:11, Sugarloaf]

(5075) Goryachev (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/05075.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-02-04 07:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a short run on this on this slow rotator on Jan 11, and started another run tonight at 23:30, Jan 11 UT.
Don [2019-01-12 01:11, Sugarloaf]

· Started this slow rotator at 00:40 UT.
Don [2019-01-06 00:53, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target on Dec 5.
Don [2018-12-07 19:59, Sugarloaf]

(2110) Moore-Sitterly (Finished) - Paired Asteroid [Add new note]
· Done well for this apparition. Petr [2019-01-28 06:16, Ondrejov]

· Started a run at 23:45, Jan 25 UT.
Don [2019-01-25 23:59, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed on Jan 12.
Don [2019-01-13 18:52, Sugarloaf]

· Started this at 01:00 UT.
Don [2019-01-12 01:06, Sugarloaf]

(9068) 1993 OD (Finished) - Paired Asteroid [Add new note]
· Done sufficiently for this apparition. Petr [2019-01-28 05:41, Ondrejov]

· Just started this one.
Russ [2019-01-25 02:43, Shed of Science] Message sent to observers

· I'll be starting this at 01:10 UT.
Don [2019-01-06 00:57, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I also observed this on Nov 30, starting at 03:45 UT.
Don [2018-11-30 17:22, Sugarloaf]

· Observed on Nov. 29-30, 22:44-04:52 UT.
Vladimir [2018-11-30 16:36, Sopot AO] Message sent to BinAstPhotSurvey conference

· Done for the 3rd apparition. Petr [2015-07-27 07:47, Ondrejov]

· Observed a full night for this target. Sky condition was excellent despite the 3/4 moon. [2015-06-27 22:45, Blue Mountains Obs] Message sent to observers

· observed from 12:45 UT 06/26 for 7 hours. Period found 3.41h [2015-06-27 07:07, Blue Mountains Obs]

· observed on 06/19 and 06/20 [2015-06-23 09:43, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I observed this target for 5 hours tonight and it's sufficient for this lunation. Peter K. [2013-12-23 23:52, Ondrejov] Message sent to observers

· Marek Husarik and coll. observed this return paired asteroid from Skalnate Pleso recently:
http://www.asu.cas.cz/~asteroid/009068_b3.png
This is sufficient data for this lunation.

Cheers, Petr [2013-12-02 09:16, Ondrejov] Message sent to BinAstPhotSurvey conference

(13166) 1995 WU1 (Finished) [Add new note]
· Russ Durkee observed this return "prime suspect" from Shed of Science South: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/13166_b9.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-25 07:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started about 3UT will go until 9UT

Russ [2019-01-13 04:38, Shed of Science]

· Good quality data from Via Capote, Ondrejov and Kharkiv didn't confirm the suspect deviations seen in the Super-LOTIS data,
http://www.asu.cas.cz/~asteroid/13166_b0.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2010-12-14 10:13, Ondrejov]

· Observed from 2010-11-29 02:10 to 2010-11-29 10:00
Dm = .21
P~3.81h
no deviations observed [2010-11-29 13:16, Via Capote] Message sent to observers

· Observing this one from 16:34 UT. Best wishes, Kamil [2010-11-27 19:48, Ondrejov]

· Observed from 2010-11-27 02:00 to 2010-11-27 10:15
Dm = .21
P~3.81h
no deviations observed [2010-11-27 14:02, Via Capote] Message sent to observers

· Observed from 2010-1126 03:00 to 2010-11-26 10:20
Dm = .24
P~3.80
no deviations observed [2010-11-26 13:34, Via Capote]

· Observed from 2010-11-25 02:30 to 2010-11-25 10:00
Dm = .23
P~3.86h
no deviations observed [2010-11-25 13:51, Via Capote] Message sent to observers

· Franck Marchis, P. Dalba and E.J. Enriquez have observed this return "prime suspect" (i.e., asteroid with P and A in the range of asynchronous binaries, but with no mutual events detected in previous apparition(s)) with Super-LOTIS on four nights 2010-11-05 to 08. Previously it was observed from Skalnate Pleso and Carbuncle Hill on five nights in March 2008:
http://www.asu.cas.cz/~asteroid/13166.png

The current observations showed the 3.81-h period, plus an additional variation with a longer period on the 11-07 and 08 (but not on the first two) nights, see
http://www.asu.cas.cz/~asteroid/13166_101105.png
http://www.asu.cas.cz/~asteroid/13166_101106.png
http://www.asu.cas.cz/~asteroid/13166_101107.png
http://www.asu.cas.cz/~asteroid/13166_101108.png

More data are needed to confirm and establish it. The asteroid is already too faint for Super-LOTIS to get data of needed quality now, so I encourage others to help out. Long sessions with errors not greater than 0.03 mag are needed.

Clear Skies, Petr [2010-11-23 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed using super-LOTIS from 2010-11-05 03:21:23.498 to 2010-11-05 10:05:10.429.
Dm=0.25
P~3.6h
No significant deviation during this night. 2 more nights on Nov 6 and Nov 7 will be taken if the weather cooperates.
F. [2010-11-05 23:20, Marchis] Message sent to BinAstPhotSurvey conference

· Gabo and Marek have done this one from Skalnate Pleso: Unique period, sufficient coverage, no deviation,
http://www.asu.cas.cz/~asteroid/13166.png
It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-03-11 08:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object is observed this evening WU1. Gabo [2008-03-07 16:51, SkalnatePleso] [Remove]
Message sent to observers

· Period refined to 3.812 +/- 0.009 hrs with an amplitude of 0.191 +/- 0.004 mag in one night. [2008-03-07 09:55, SkalnatePleso] [Remove]

· My object today is WU1. Gabo [2008-03-06 20:31, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(100006) 1987 DA7 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 5 nights: Good solution, excellent coverage, no deviation seen.
http://www.asu.cas.cz/~asteroid/100006.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-18 07:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 02:00 UT.
Don [2019-01-16 01:15, Sugarloaf]

· I'm planning to start this at 02:00 UT.
Don [2019-01-15 01:10, Sugarloaf] Message sent to observers

· I started this one at 02:00 UT.
Don [2019-01-14 02:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed this on Jan 12.
Don [2019-01-13 18:54, Sugarloaf]

(2070) Humason (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4599, copied below for your convenience.

Cheers, Petr

(2070) HUMASON
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; and
V. Chiorny, Kharkiv Observatory, report that photometric observations obtained
with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.35-m telescope
at the Organ Mesa Observatory, and a 0.70-m telescope at the Chuguev station
of the Kharkiv Observatory in Ukraine during 2018 Oct. 13-Nov. 2 reveal that
minor planet (2070) is a binary system with an orbital period of 53.5 Â± 0.1
hr. The primary shows a period of 3.1883 Â± 0.0005 hr and has a light-curve
amplitude of 0.15 mag at solar phases 1-3 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.10- to 0.15-
magnitude deep indicate a secondary-to-primary mean-diameter ratio of 0.31
Â± 0.02.

2019 January 16 (CBET 4599) Daniel W. E. Green [2019-01-17 08:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our complete data for this one. Despite the somewhat limited coverage in October, the orbital period appears unique. Then the events disappeared in November; the system apparently moved away from the event geometry.
http://www.asu.cas.cz/~asteroid/02070_2018a_porb.png
http://www.asu.cas.cz/~asteroid/02070_2018a_p1.png
http://www.asu.cas.cz/~asteroid/02070_2018b_porb.png
http://www.asu.cas.cz/~asteroid/02070_2018b_p1.png
http://www.asu.cas.cz/~asteroid/02070_2018c_porb.png
http://www.asu.cas.cz/~asteroid/02070_2018c_p1.png
http://www.asu.cas.cz/~asteroid/02070_2018d_porb.png
http://www.asu.cas.cz/~asteroid/02070_2018d_p1.png

Going to do a report for CBET.

Petr [2019-01-11 06:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Nov. 30, 16:20-20:10 UT.
Vladimir [2018-12-02 16:04, Sopot AO] Message sent to observers

· Observed on Nov. 29, 16:25-21:42 UT.
Vladimir [2018-11-30 16:28, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed first event from 16:30 to 21:30 UT. Vasilij Ch. [2018-11-02 23:52, Kharkiv] Message sent to observers

· Vladimir Benishek has resolved the orbital period, it is unique solution now:
http://www.asu.cas.cz/~asteroid/02070_2018a_porb.png
http://www.asu.cas.cz/~asteroid/02070_2018a_p1.png

At least one more coverage for each of the two events is needed before we publish this one on CBET. Errors < 0.02 mag are needed; don't bother in suboptimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-20 11.51 0.251
2018-10-29 8.71 0.251
2018-10-31 14.01 0.251
2018-11- 2 19.31 0.251
2018-11- 5 0.61 0.251
2018-11- 7 5.91 0.251
2018-11- 9 11.21 0.251
2018-11-11 16.51 0.251
2018-11-13 21.81 0.251
2018-11-16 3.11 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-19 8.99 0.754
2018-10-28 6.19 0.754
2018-10-30 11.49 0.754
2018-11- 1 16.79 0.754
2018-11- 3 22.09 0.754
2018-11- 6 3.39 0.754
2018-11- 8 8.69 0.754
2018-11-10 13.99 0.754
2018-11-12 19.29 0.754
2018-11-15 0.59 0.754

Clear Skies, Petr [2018-10-18 08:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek observed this off-list target from Sopot, found it to be binary. P_orb is not unique yet, there are a few possible solutions; a lc decomposition for one of them:
http://www.asu.cas.cz/~asteroid/02070_2018a_porb.png
http://www.asu.cas.cz/~asteroid/02070_2018a_p1.png

Vladimir would appreciate a help. Errors <= 0.02 mag are needed and long sessions are prefered.

Clear Skies, Petr [2018-10-15 12:49, Ondrejov] Message sent to BinAstPhotSurvey conference

(4039) Souseki (Finished) [Add new note]
· I'm planning to start a run on this at 03:00 UT.
Don [2019-01-17 02:12, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this one at 22:05 UT.
Vladimir [2019-01-16 22:33, Sopot AO] Message sent to observers

· Starting this at 03:05 UT.
Don [2019-01-16 01:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to begin a run on this at 03:15 UT.
Don [2019-01-14 02:07, Sugarloaf]

· Doing an additional run on this previously closed target, starting at 03:30 UT.
Don [2019-01-12 01:08, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This new target was observed by Don Pray from Sugarloaf Mountain and Vladimir Benishek from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04039.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-09 08:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this one at 03:50 UT.
Don [2019-01-06 00:55, Sugarloaf]

· Started this one on Jan 2.
Don [2019-01-03 15:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

(9617) Grahamchapman (Finished) - binary [Add new note]
· Campaign closed. Petr [2019-01-16 09:58, Ondrejov]

· Data obtained by Don Pray for this binary in its current apparition so far:
http://www.asu.cas.cz/~asteroid/09617_2018a_porb.png
http://www.asu.cas.cz/~asteroid/09617_2018a_p1.png

More data (with errors not greater than 0.02 mag) would be useful for a refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-26 10.38 0.260
2018-12-27 5.77 0.260
2018-12-28 1.15 0.260
2018-12-28 20.54 0.260
2018-12-29 15.92 0.260
2018-12-30 11.31 0.260
2018-12-31 6.69 0.260
2019- 1- 1 2.08 0.260
2019- 1- 1 21.46 0.260
2019- 1- 2 16.85 0.260
2019- 1- 3 12.23 0.260
2019- 1- 4 7.62 0.260
2019- 1- 5 3.00 0.260
2019- 1- 5 22.39 0.260
2019- 1- 6 17.77 0.260
2019- 1- 7 13.16 0.260
2019- 1- 8 8.54 0.260
2019- 1- 9 3.93 0.260
2019- 1- 9 23.31 0.260
2019- 1-10 18.70 0.260
2019- 1-11 14.08 0.260
2019- 1-12 9.47 0.260
2019- 1-13 4.85 0.260
2019- 1-14 0.24 0.260
2019- 1-14 19.62 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-26 0.49 0.750
2018-12-26 19.88 0.750
2018-12-27 15.26 0.750
2018-12-28 10.65 0.750
2018-12-29 6.03 0.750
2018-12-30 1.42 0.750
2018-12-30 20.80 0.750
2018-12-31 16.19 0.750
2019- 1- 1 11.57 0.750
2019- 1- 2 6.96 0.750
2019- 1- 3 2.34 0.750
2019- 1- 3 21.73 0.750
2019- 1- 4 17.11 0.750
2019- 1- 5 12.50 0.750
2019- 1- 6 7.88 0.750
2019- 1- 7 3.27 0.750
2019- 1- 7 22.65 0.750
2019- 1- 8 18.04 0.750
2019- 1- 9 13.42 0.750
2019- 1-10 8.81 0.750
2019- 1-11 4.19 0.750
2019- 1-11 23.58 0.750
2019- 1-12 18.96 0.750
2019- 1-13 14.35 0.750
2019- 1-14 9.73 0.750

Clear Skies, Petr [2018-12-19 13:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 01:10, Dec 13 UT. Hopefully, clouds will hold off until after the event at 02:20 UT.
Don [2018-12-12 22:53, Sugarloaf]

· Don Pray took a second night for this one. Current lc decomposition:
http://www.asu.cas.cz/~asteroid/09617_2018a_porb.png
http://www.asu.cas.cz/~asteroid/09617_2018a_p1.png

More data (with errors not greater than 0.02 mag) for both events are needed for a refined modeling. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-12 16.86 0.261
2018-12-13 12.24 0.261
2018-12-14 7.63 0.261
2018-12-15 3.01 0.261
2018-12-15 22.40 0.261
2018-12-16 17.78 0.261
2018-12-17 13.17 0.261
2018-12-18 8.55 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-13 2.33 0.750
2018-12-13 21.72 0.750
2018-12-14 17.10 0.750
2018-12-15 12.49 0.750
2018-12-16 7.87 0.750
2018-12-17 3.26 0.750
2018-12-17 22.64 0.750
2018-12-18 18.03 0.750

Clear Skies, Petr [2018-12-12 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 01:15 UT.
DOn [2018-12-11 00:27, Sugarloaf]

· Don Pray took first data for this return binary in its current 4th apparition. A lc decomposition (a little bit tentative; more data is needed to improve):
http://www.asu.cas.cz/~asteroid/09617_2018a_porb.png
http://www.asu.cas.cz/~asteroid/09617_2018a_p1.png

Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-12- 2 14.10 0.250
2018-12- 3 9.49 0.250
2018-12- 4 4.87 0.250
2018-12- 5 0.26 0.250
2018-12- 5 19.64 0.250
2018-12- 6 15.03 0.250
2018-12- 7 10.41 0.250
2018-12- 8 5.80 0.250
2018-12- 9 1.18 0.250
2018-12- 9 20.57 0.250
2018-12-10 15.95 0.250
2018-12-11 11.34 0.250
2018-12-12 6.72 0.250
2018-12-13 2.11 0.250
2018-12-13 21.49 0.250
2018-12-14 16.88 0.250
2018-12-15 12.26 0.250
2018-12-16 7.65 0.250
2018-12-17 3.03 0.250
2018-12-17 22.42 0.250
2018-12-18 17.80 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2018-12- 2 23.78 0.750
2018-12- 3 19.17 0.750
2018-12- 4 14.55 0.750
2018-12- 5 9.94 0.750
2018-12- 6 5.32 0.750
2018-12- 7 0.71 0.750
2018-12- 7 20.09 0.750
2018-12- 8 15.48 0.750
2018-12- 9 10.86 0.750
2018-12-10 6.25 0.750
2018-12-11 1.63 0.750
2018-12-11 21.02 0.750
2018-12-12 16.40 0.750
2018-12-13 11.79 0.750
2018-12-14 7.17 0.750
2018-12-15 2.56 0.750
2018-12-15 21.94 0.750
2018-12-16 17.33 0.750
2018-12-17 12.71 0.750
2018-12-18 8.10 0.750

Clear Skies, Petr [2018-12-02 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start a run at 02:00 UT.
Don [2018-12-01 01:13, Sugarloaf]

· Starting this one tonight. Finally a clear night!
Don [2018-11-30 00:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This one has been well observed from Modra and Ondrejov recently:
http://www.asu.cas.cz/~asteroid/09617_11_porb.png
http://www.asu.cas.cz/~asteroid/09617_11_p1.png
Done for the 3rd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-11-08 10:30, Ondrejov]

· Observing this one from 18:20 UT. Best wishes, Kamil [2011-10-22 19:04, Ondrejov] Message sent to observers

· More observations (errors < 0.03 mag) would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011-10-15 14.49 0.254
2011-10-16 9.87 0.254
2011-10-17 5.26 0.254
2011-10-18 0.64 0.254
2011-10-18 20.03 0.254
2011-10-19 15.41 0.254
2011-10-20 10.80 0.254
2011-10-21 6.18 0.254
2011-10-22 1.57 0.254
2011-10-22 20.95 0.254
2011-10-23 16.34 0.254
2011-10-24 11.72 0.254
2011-10-25 7.11 0.254
2011-10-26 2.49 0.254
2011-10-26 21.88 0.254
2011-10-27 17.26 0.254
2011-10-28 12.65 0.254
2011-10-29 8.03 0.254
2011-10-30 3.42 0.254
2011-10-30 22.80 0.254
2011-10-31 18.19 0.254
2011-11- 1 13.57 0.254
2011-11- 2 8.96 0.254
2011-11- 3 4.34 0.254
2011-11- 3 23.73 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2011-10-15 4.72 0.750
2011-10-16 0.11 0.750
2011-10-16 19.49 0.750
2011-10-17 14.88 0.750
2011-10-18 10.26 0.750
2011-10-19 5.65 0.750
2011-10-20 1.03 0.750
2011-10-20 20.42 0.750
2011-10-21 15.80 0.750
2011-10-22 11.19 0.750
2011-10-23 6.57 0.750
2011-10-24 1.96 0.750
2011-10-24 21.34 0.750
2011-10-25 16.73 0.750
2011-10-26 12.11 0.750
2011-10-27 7.50 0.750
2011-10-28 2.88 0.750
2011-10-28 22.27 0.750
2011-10-29 17.65 0.750
2011-10-30 13.04 0.750
2011-10-31 8.42 0.750
2011-11- 1 3.81 0.750
2011-11- 1 23.19 0.750
2011-11- 2 18.58 0.750
2011-11- 3 13.96 0.750
2011-11- 4 9.35 0.750

Clear Skies, Petr [2011-10-09 10:09, Ondrejov]

· Planning this one tonight. Leos, Jozef. [2011-10-03 17:42, Modra]

· Observad in Oct. 2/3. Leos [2011-10-03 08:30, Modra] Message sent to observers

· I want to continue again with this target tonight. Adrian [2011-10-01 20:16, Modra] Message sent to BinAstPhotSurvey conference

· I'd like to continue with this binary. Maybe one attenuation was just at the beginning of the last session. Adrian [2011-09-30 20:18, Modra] Message sent to observers

· Just a try to look at this returning binary for a couple of hours tonight. Adrian [2011-09-29 20:11, Modra] Message sent to BinAstPhotSurvey conference

· The binary has been worked from Ondrejov and from Don's new station. The primary minimum has been covered reasonably, the secondary minimum poorly. Anyway, the events are apparently partial; they are less deep and narrower than in the 2006 apparition. They are good data for modeling.
http://www.asu.cas.cz/~asteroid/09617_08_porb.png
http://www.asu.cas.cz/~asteroid/09617_08_p1.png

The asteroid is too faint now, so we are closing it here.

Cheers, Petr [2009-01-06 11:36, Ondrejov] Message sent to observers

· Started a run at 00:40 UT. No wind now, but high winds are forecast in a few hours. Last night was ruined by wind.
Don [2008-12-30 02:58, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing this one from 17:00 UT. Best wishes, Kamil [2008-12-29 19:38, Ondrejov] Message sent to observers

· I started a run at 02:00 UT, but it's windy so the outcome is questionable.
Don [2008-12-29 02:32, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing this one from 17 UT. Best wishes, Kamil [2008-12-28 18:55, Ondrejov] Message sent to observers

· Observing from 20:15 UT but the sky is not very good. Peter K. [2008-12-23 22:41, Ondrejov]

· Started a run at 01:30 UT.
Don [2008-12-06 01:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started run at 01:00 UT.
Don [2008-12-04 01:02, CarbuncleHill]

· I'm back. Started a delayed run on my old friend Grahamchapman at 03:40 UT. We'll see how the 0.5m works at it's new location in Massachusetts.
Don [2008-12-03 03:55, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Out CBET announcement has been released (on Mar 1, actually). A note has been placed at http://binast-webtool.astro.cz/. Great work everybody!

Don

(9617) GRAHAMCHAPMAN
D. Pray, Carbuncle Hill Observatory, Greene, RI; P. Pravec
and P. Kusnirak, Ondrejov Observatory; V. Reddy, Department of
Space Studies, University of North Dakota, Grand Forks; R. Dyvig,
Quinn, SD; and S. Gajdos, Modra Observatory, report that photometric
observations obtained during 2006 Jan. 27 to Feb. 28 reveal that
minor planet (9617) is a binary system with an orbital period of
19.385 +/- 0.005 hours. The primary rotates with a period of
2.2856 +/- 0.0001 hours, and its lightcurve amplitude of 0.10 mag
is indicative of a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.07- to 0.16-mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.27 +/- 0.03.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 March 1 (CBET 414) Daniel W. E. Green [2006-03-09 15:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· New data by Don from Carbuncle Hill and by Vishnu&Ron from Badlands (3 nights each station) have nailed down this one. The solution is unique now:
Pprim= 2.2856 +/-0.0001 h
Porb= 19.385 +/-0.005 h
Aprim= 0.10 mag
Ds/Dp= 0.27 +/-0.03.
http://www.asu.cas.cz/~ppravec/9617_all.png
http://www.asu.cas.cz/~ppravec/9617_longpc.png
http://www.asu.cas.cz/~ppravec/9617_shortpc.png

We are going to send a discovery announcement on this one to CBET. I will place a note on it to the Survey's web page
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
after the discovery announcement appears on CBET.

Very nice work, Don et al. on the though one!

Cheers, Petr [2006-02-28 16:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will be starting this around 23:30, Feb, 27.

Don [2006-02-27 21:12, CarbuncleHill]

· Started this at 00:00 UT, 2/27

Don [2006-02-27 02:01, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Finished run at 9:30 UT. Completed ~ 7h.

Ron & Vishnu [2006-02-26 09:39, Vishnu Reddy/Tucson]

· Commenced run at 7:11 UT...will continue as long as conditions allow.

Ron & Vishnu [2006-02-26 02:15, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Started this at 2:30ut (02/25). Can get 5hr max if clouds hold off.

Don [2006-02-25 02:33, CarbuncleHill]

· Terminated run at 8:50 UT due to increasing winds blowing directly through the dome slot. Ended up getting ~ 6h on this object.

Ron & Vishnu [2006-02-24 08:54, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Started run at 7 pm MST. Should get at least 7 hours of data if weather holds. Reduced data should be available within next 24 hours if all goes well.
Vishnu and Ron [2006-02-24 02:41, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· New data of 2006-02-21.1 and 22.2 by Don Pray joined in. The solution is stabilizing, the current best estimates are:
Pprim= 2.2854 +/-0.0001 h
Porb= 19.385 h (error <0.01 h)
Aprim= 0.09 mag
Ds/Dp ~0.3 (needs to be nailed down with more data).
See following pictures:
http://www.asu.cas.cz/~ppravec/9617_all.png
http://www.asu.cas.cz/~ppravec/9617_longpc.png
http://www.asu.cas.cz/~ppravec/9617_shortpc.png
Though the asteroid is fading by 0.03 mag/day, Don is still able to get useful data, so I encourage to continue (in best sky conditions only, of course; errors greater than 0.03 mag wouldn't be useful). After a couple more nights of similar quality, we may announce this one on CBET.

Cheers, Petr [2006-02-23 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:10, Feb 22.

Don [2006-02-22 00:10, CarbuncleHill]

· This one has been near a magnitude limit for our systems, but eventually its binary nature is materializing with a higher number of points. Eight nights by Don Pray from Carbuncle Hill, two linked nights by Peter Kusnirak from here, and one night by Stefan Gajdos from Modra have revealed a short period of 2.2854 h (U=2+) and superimposed attenuations with a possible period of 19.38 h (needs to be nailed down with more data), see
http://www.asu.cas.cz/~ppravec/9617_all.png
http://www.asu.cas.cz/~ppravec/9617_longpc.png
http://www.asu.cas.cz/~ppravec/9617_shortpc.png
The solution is a bit weak due to the relative faintness of the asteroid; our photometric errors were mostly in the range 0.02-0.03 mag. (The asteroid appeared about half mag fainter than predicted using the MPC's H.) More data by those of you who can work it with errors not greater than 0.03 mag are needed to nail it down.

Cheers, Petr [2006-02-21 14:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Clear skies again. I'll be starting this around 00:00 on the 21st UT.

Don [2006-02-20 22:35, CarbuncleHill]

· Started at 0:10 (2/20). Clear sky. [2006-02-20 01:16, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started this at 0:50 (2/19) under clear, but windy conditions.

Don [2006-02-19 01:03, CarbuncleHill]

· The sky is clear, so I'll be doing this one tonight.

Don [2006-02-07 22:12, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll being doing this one tonight if conditions are clear, as forecast. Hopefully, this will extend Modra's run.

Don [2006-02-06 19:32, CarbuncleHill]

· Started with it on Feb06 19:07UT. Hoping in stabile conditions at least for one period.

Stefan [2006-02-06 19:19, Modra] Message sent to BinAstPhotSurvey conference

· Data by Don from Carbuncle (4 nights) and by Peter K. from here (2 linked nights) don't fit together with any single period. A rather tentative solution is with periods of 2.285 and 19.96 hours, but more data are needed. Only long sessions are going to be useful, and since the asteroid is relatively faint, good sky conditions are needed. If you cannot take data with errors of 0.03 mag or better, don't bother.

Cheers, Petr [2006-02-06 13:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· In a break between storms, I was fortunate to get a run of about 4 hours in. Still looking suspiciously like two periods convolved, but that's up to Petr.

Don [2006-02-04 23:43, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 20:15 UT and expecting full-night run (if weather allows). This is my primary target for tonight.

Peter K. [2006-01-29 20:20, Ondrejov]

· For all you Monty Python fans, letting you know I did a run on this on 1/27. This has a very active lightcurve that needs more data. I'm doing a run on it tonight (1/28).

Don [2006-01-27 23:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(6245) Ikufumi (Finished) - binary [Add new note]
· Discovery apparition done. Petr [2019-01-16 09:50, Ondrejov]

· Our data for this binary so far:
http://www.asu.cas.cz/~asteroid/06245_2018a_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018a_p1.png
http://www.asu.cas.cz/~asteroid/06245_2018b_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018b_p1.png
http://www.asu.cas.cz/~asteroid/06245_2018c_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018c_p1.png
http://www.asu.cas.cz/~asteroid/06245_2018d_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018d_p1.png

Further monitoring (with errors <= 0.02 mag) would be useful for a future modeling of the system; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-26 7.94 0.247
2018-12-26 23.38 0.247
2018-12-27 14.82 0.247
2018-12-28 6.26 0.247
2018-12-28 21.70 0.247
2018-12-29 13.13 0.247
2018-12-30 4.57 0.247
2018-12-30 20.01 0.247
2018-12-31 11.45 0.247
2019- 1- 1 2.89 0.247
2019- 1- 1 18.33 0.247
2019- 1- 2 9.77 0.247
2019- 1- 3 1.21 0.247
2019- 1- 3 16.65 0.247
2019- 1- 4 8.09 0.247
2019- 1- 4 23.52 0.247
2019- 1- 5 14.96 0.247
2019- 1- 6 6.40 0.247
2019- 1- 6 21.84 0.247
2019- 1- 7 13.28 0.247
2019- 1- 8 4.72 0.247
2019- 1- 8 20.16 0.247
2019- 1- 9 11.60 0.247
2019- 1-10 3.04 0.247
2019- 1-10 18.48 0.247
2019- 1-11 9.91 0.247
2019- 1-12 1.35 0.247
2019- 1-12 16.79 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-26 0.12 0.741
2018-12-26 15.56 0.741
2018-12-27 7.00 0.741
2018-12-27 22.44 0.741
2018-12-28 13.88 0.741
2018-12-29 5.32 0.741
2018-12-29 20.76 0.741
2018-12-30 12.20 0.741
2018-12-31 3.63 0.741
2018-12-31 19.07 0.741
2019- 1- 1 10.51 0.741
2019- 1- 2 1.95 0.741
2019- 1- 2 17.39 0.741
2019- 1- 3 8.83 0.741
2019- 1- 4 0.27 0.741
2019- 1- 4 15.71 0.741
2019- 1- 5 7.15 0.741
2019- 1- 5 22.59 0.741
2019- 1- 6 14.02 0.741
2019- 1- 7 5.46 0.741
2019- 1- 7 20.90 0.741
2019- 1- 8 12.34 0.741
2019- 1- 9 3.78 0.741
2019- 1- 9 19.22 0.741
2019- 1-10 10.66 0.741
2019- 1-11 2.10 0.741
2019- 1-11 17.54 0.741
2019- 1-12 8.98 0.741

Clear Skies, Petr [2018-12-19 14:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 2:00 UT 12/2 should run until 9:00 UT 12/2.

Russ [2018-12-03 01:20, Shed of Science] Message sent to observers

· Started at 2:30 UT on 11/30 and ran until 9:00UT 11/30

Russ [2018-11-30 12:13, Shed of Science]

· Started at 2:00 UT 11/29 should run until 9:00 UT 11/29.

Russ [2018-11-29 02:12, Shed of Science] Message sent to observers

· Our announcement on this one has appeared on CBET 4575, copied below for your convenience.

Cheers, Petr

(6245) IKUFUMI
V. Benishek, Belgrade Astronomical Observatory; D. Pray, Sugarloaf
Mountain Observatory, South Deerfield, MA, U.S.A.; P. Pravec, K. Hornoch,
and H. Kucakova, Ondrejov Observatory; V. Chiorny, Kharkiv Observatory; and
R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A., report
that photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.65-m telescope at the Ondrejov Observatory, a 0.70-m
telescope at the Chuguev station of the Kharkiv Observatory in Ukraine, and
a 0.50-m telescope at the Shed of Science South Observatory during Oct. 6-
Nov. 15 reveal that minor planet (6245) is a binary system with an orbital
period of 15.439 Â± 0.004 hr, The primary shows a period of 2.9222 Â±
0.0001 hr and has a light-curve amplitude of 0.10 mag at solar phase of 8
degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.06 to 0.08 magnitude deep indicate a secondary-to-primary
mean-diameter ratio of 0.23 Â± 0.02.

2018 November 27 (CBET 4575) Daniel W. E. Green [2018-11-27 07:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our data for this one:
http://www.asu.cas.cz/~asteroid/06245_2018a_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018a_p1.png
http://www.asu.cas.cz/~asteroid/06245_2018b_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018b_p1.png
http://www.asu.cas.cz/~asteroid/06245_2018c_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018c_p1.png
We are going to do a CBET announcement.

Further monitoring (with errors <= 0.02 mag) would be useful for a future modeling of the system; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-11-26 2.26 0.244
2018-11-26 17.70 0.244
2018-11-27 9.14 0.244
2018-11-28 0.58 0.244
2018-11-28 16.02 0.244
2018-11-29 7.46 0.244
2018-11-29 22.90 0.244
2018-11-30 14.33 0.244
2018-12- 1 5.77 0.244
2018-12- 1 21.21 0.244
2018-12- 2 12.65 0.244
2018-12- 3 4.09 0.244
2018-12- 3 19.53 0.244
2018-12- 4 10.97 0.244
2018-12- 5 2.41 0.244
2018-12- 5 17.85 0.244
2018-12- 6 9.29 0.244
2018-12- 7 0.72 0.244
2018-12- 7 16.16 0.244
2018-12- 8 7.60 0.244
2018-12- 8 23.04 0.244
2018-12- 9 14.48 0.244
2018-12-10 5.92 0.244
2018-12-10 21.36 0.244
2018-12-11 12.80 0.244
2018-12-12 4.24 0.244
2018-12-12 19.68 0.244
2018-12-13 11.11 0.244
2018-12-14 2.55 0.244
2018-12-14 17.99 0.244
2018-12-15 9.43 0.244
2018-12-16 0.87 0.244
2018-12-16 16.31 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2018-11-26 9.96 0.743
2018-11-27 1.40 0.743
2018-11-27 16.84 0.743
2018-11-28 8.28 0.743
2018-11-28 23.71 0.743
2018-11-29 15.15 0.743
2018-11-30 6.59 0.743
2018-11-30 22.03 0.743
2018-12- 1 13.47 0.743
2018-12- 2 4.91 0.743
2018-12- 2 20.35 0.743
2018-12- 3 11.79 0.743
2018-12- 4 3.23 0.743
2018-12- 4 18.67 0.743
2018-12- 5 10.10 0.743
2018-12- 6 1.54 0.743
2018-12- 6 16.98 0.743
2018-12- 7 8.42 0.743
2018-12- 7 23.86 0.743
2018-12- 8 15.30 0.743
2018-12- 9 6.74 0.743
2018-12- 9 22.18 0.743
2018-12-10 13.62 0.743
2018-12-11 5.06 0.743
2018-12-11 20.49 0.743
2018-12-12 11.93 0.743
2018-12-13 3.37 0.743
2018-12-13 18.81 0.743
2018-12-14 10.25 0.743
2018-12-15 1.69 0.743
2018-12-15 17.13 0.743
2018-12-16 8.57 0.743

Clear Skies, Petr [2018-11-21 07:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 1:30 UT Nov 15.

Russ [2018-11-15 01:28, Shed of Science] Message sent to observers

· Starting at 2:00 Nov 14 UT.

New Observatory Up and Running in TX! First Data Run for SOS South!
Russ [2018-11-14 02:21, Shed of Science]

· Starting this at 23:40, Nov11 UT.
Don [2018-11-11 22:59, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 00:10 UT.
Don [2018-11-09 00:12, Sugarloaf] Message sent to observers

· Started observing this one tonight.
Vladimir [2018-11-08 17:33, Sopot AO]

· Started this at 00:15 UT.
Don [2018-11-08 00:27, Sugarloaf]

· Observed this target from 17:00 to 21:30 UT.
Vasilij Ch. [2018-11-07 23:27, Kharkiv] Message sent to observers

· I started this at 01:05 UT, and may catch both events.
Don [2018-10-31 00:53, Sugarloaf]

· This one is very close to be published on CBET. More observations would be still useful. Errors of 0.01 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-28 3.40 0.236
2018-10-28 18.84 0.236
2018-10-29 10.28 0.236
2018-10-30 1.72 0.236
2018-10-30 17.16 0.236
2018-10-31 8.60 0.236
2018-11- 1 0.04 0.236
2018-11- 1 15.48 0.236
2018-11- 2 6.92 0.236
2018-11- 2 22.36 0.236
2018-11- 3 13.80 0.236
2018-11- 4 5.24 0.236
2018-11- 4 20.68 0.236
2018-11- 5 12.12 0.236
2018-11- 6 3.56 0.236
2018-11- 6 19.00 0.236
2018-11- 7 10.44 0.236
2018-11- 8 1.88 0.236
2018-11- 8 17.32 0.236
2018-11- 9 8.76 0.236
2018-11-10 0.20 0.236
2018-11-10 15.64 0.236
2018-11-11 7.08 0.236
2018-11-11 22.52 0.236
2018-11-12 13.96 0.236
2018-11-13 5.40 0.236
2018-11-13 20.84 0.236
2018-11-14 12.28 0.236
2018-11-15 3.72 0.236
2018-11-15 19.16 0.236
2018-11-16 10.60 0.236
2018-11-17 2.04 0.236
2018-11-17 17.48 0.236
2018-11-18 8.92 0.236
2018-11-19 0.36 0.236
2018-11-19 15.80 0.236

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-28 11.29 0.747
2018-10-29 2.73 0.747
2018-10-29 18.17 0.747
2018-10-30 9.61 0.747
2018-10-31 1.05 0.747
2018-10-31 16.49 0.747
2018-11- 1 7.93 0.747
2018-11- 1 23.37 0.747
2018-11- 2 14.81 0.747
2018-11- 3 6.25 0.747
2018-11- 3 21.69 0.747
2018-11- 4 13.13 0.747
2018-11- 5 4.57 0.747
2018-11- 5 20.01 0.747
2018-11- 6 11.45 0.747
2018-11- 7 2.89 0.747
2018-11- 7 18.33 0.747
2018-11- 8 9.77 0.747
2018-11- 9 1.21 0.747
2018-11- 9 16.65 0.747
2018-11-10 8.09 0.747
2018-11-10 23.53 0.747
2018-11-11 14.97 0.747
2018-11-12 6.41 0.747
2018-11-12 21.85 0.747
2018-11-13 13.29 0.747
2018-11-14 4.73 0.747
2018-11-14 20.17 0.747
2018-11-15 11.61 0.747
2018-11-16 3.05 0.747
2018-11-16 18.49 0.747
2018-11-17 9.93 0.747
2018-11-18 1.37 0.747
2018-11-18 16.81 0.747
2018-11-19 8.25 0.747
2018-11-19 23.69 0.747

Clear Skies, Petr [2018-10-20 15:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 01:10 UT, and hope to catch the 0.236 phase event.
Don [2018-10-19 00:00, Sugarloaf] Message sent to observers

· observing this target from 19:00 UT.Vasilij Ch. [2018-10-18 18:17, Kharkiv]

· Current data for this new binary:
http://www.asu.cas.cz/~asteroid/06245_2018a_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018a_p1.png
The orbital period is unique now. Before publishing it on CBET, one more coverage for each of the two events is needed to refine the solution. Errors of 0.01 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-18 11.92 0.236
2018-10-19 3.37 0.236
2018-10-19 18.82 0.236
2018-10-20 10.27 0.236
2018-10-21 1.72 0.236
2018-10-21 17.17 0.236
2018-10-28 3.67 0.236
2018-10-28 19.12 0.236
2018-10-29 10.57 0.236
2018-10-30 2.02 0.236
2018-10-30 17.47 0.236
2018-10-31 8.92 0.236
2018-11- 1 0.37 0.236
2018-11- 1 15.82 0.236
2018-11- 2 7.27 0.236
2018-11- 2 22.72 0.236
2018-11- 3 14.17 0.236
2018-11- 4 5.62 0.236
2018-11- 4 21.07 0.236
2018-11- 5 12.52 0.236
2018-11- 6 3.97 0.236
2018-11- 6 19.42 0.236
2018-11- 7 10.87 0.236
2018-11- 8 2.32 0.236
2018-11- 8 17.77 0.236
2018-11- 9 9.22 0.236
2018-11-10 0.67 0.236
2018-11-10 16.12 0.236
2018-11-11 7.57 0.236
2018-11-11 23.02 0.236
2018-11-12 14.47 0.236
2018-11-13 5.92 0.236
2018-11-13 21.37 0.236
2018-11-14 12.82 0.236
2018-11-15 4.27 0.236
2018-11-15 19.72 0.236
2018-11-16 11.17 0.236
2018-11-17 2.62 0.236
2018-11-17 18.07 0.236
2018-11-18 9.52 0.236
2018-11-19 0.97 0.236
2018-11-19 16.42 0.236

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-18 19.86 0.750
2018-10-19 11.31 0.750
2018-10-20 2.76 0.750
2018-10-20 18.21 0.750
2018-10-21 9.66 0.750
2018-10-28 11.61 0.750
2018-10-29 3.06 0.750
2018-10-29 18.51 0.750
2018-10-30 9.96 0.750
2018-10-31 1.41 0.750
2018-10-31 16.86 0.750
2018-11- 1 8.31 0.750
2018-11- 1 23.76 0.750
2018-11- 2 15.21 0.750
2018-11- 3 6.66 0.750
2018-11- 3 22.11 0.750
2018-11- 4 13.56 0.750
2018-11- 5 5.01 0.750
2018-11- 5 20.46 0.750
2018-11- 6 11.91 0.750
2018-11- 7 3.36 0.750
2018-11- 7 18.81 0.750
2018-11- 8 10.26 0.750
2018-11- 9 1.71 0.750
2018-11- 9 17.16 0.750
2018-11-10 8.61 0.750
2018-11-11 0.06 0.750
2018-11-11 15.51 0.750
2018-11-12 6.96 0.750
2018-11-12 22.41 0.750
2018-11-13 13.86 0.750
2018-11-14 5.31 0.750
2018-11-14 20.76 0.750
2018-11-15 12.21 0.750
2018-11-16 3.66 0.750
2018-11-16 19.11 0.750
2018-11-17 10.56 0.750
2018-11-18 2.01 0.750
2018-11-18 17.46 0.750
2018-11-19 8.91 0.750

Clear Skies, Petr [2018-10-18 08:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· observing this one from 16 UT. Vasiliy Ch. [2018-10-17 17:41, Kharkiv] Message sent to observers

· Data obtained by Vladimir Benishek and Don Pray for this one so far:
http://www.asu.cas.cz/~asteroid/06245_2018a_porb.png
http://www.asu.cas.cz/~asteroid/06245_2018a_p1.png
The solution is still somewhat tentative, more data are needed to nail it down. Errors of 0.01 mag are needed and long session are prefered; don't bother in less ideal conditions.

Clear Skies, Petr [2018-10-15 08:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this ai 01:30 UT.
Don [2018-10-14 01:46, Sugarloaf] Message sent to observers

· Observed this target on 11/12 Oct from !9:00 to 01:00 UT.
Vasilij Ch. [2018-10-12 18:50, Kharkiv]

· Vladimir Benishek and Don Pray took first data for this new target. Vladimir found there suspect deviations. A formal best fit to the data:
http://www.asu.cas.cz/~asteroid/06245.png

More observations are needed to reveal what it is.

Clear Skies, Petr [2018-10-11 06:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 01:50 UT.
Don [2018-10-10 00:25, Sugarloaf]

· I took 2 short sessions on this, both in fair to poor condition, on Sep 19 and Oct 6.
Don [2018-10-09 18:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed this new target on Oct. 8-9 (23:48-03:09 UT).
Vladimir [2018-10-09 17:27, Sopot AO]

(454177) 2013 GJ35 (Finished) [Add new note]
· Don Pray did this new target (NEA) from Sugarloaf Mountain on two nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/454177.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don on the fast mover.

Petr [2019-01-11 11:50, Ondrejov] Message sent to BinAstPhotSurvey conference

(6151) Viget (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06151.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-07 15:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one on Jan 2.
DOn [2019-01-03 15:01, Sugarloaf]

(2337) Boubin (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4592, copied below for your convenience.

Cheers, Petr

(2337) BOUBIN
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA,
U.S.A.; O. Labrevoir, Saint-Michel l'Observatoire, France; A. Carbognani,
Astronomical Observatory of the Autonomous Region of the Aosta Valley, Italy;
R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; and F.
Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A., report that
photometric observations obtained with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.58-m telescope at the Saint-Michel l'Observatoire, a 0.50-m
telescope at the Shed of Science South Observatory, and a 0.35-m telescope
at the Organ Mesa Observatory during 2018 Oct. 24-Dec. 18 reveal that minor
planet (2337) is a binary system with an orbital period of 16.09 Â± 0.01 hr.
The primary shows a period of 2.53163 Â± 0.00009 hr and has a light-curve
amplitude of 0.06 mag at solar phases 5-15 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.03-magnitude
deep indicate a lower limit on the secondary-to-primary mean-diameter ratio
of 0.16.

2019 January 7 (CBET 4592) Daniel W. E. Green [2019-01-07 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our final data for this new binary:
http://www.asu.cas.cz/~asteroid/02337_2018a_porb.png
http://www.asu.cas.cz/~asteroid/02337_2018a_p1.png
Despite the shallow events, the orbital period was uniquely resolved, thanks to the good amount of data with errors about 0.01 mag. Going to do an announcement for CBET.

Cheers, Petr [2019-01-03 11:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started about 4:30 UT 12/15

Russ [2018-12-15 04:48, Shed of Science] Message sent to observers

· I started a run on this at 22:45, Dec 12 UT.
Don [2018-12-12 22:50, Sugarloaf]

· Started this at 23:00, Dec 10 UT.
Don [2018-12-10 23:08, Sugarloaf]

· New data by Don Pray and Vladimir Benishek give following (still somewhat tentative, but probably correct) solution for this one:
http://www.asu.cas.cz/~asteroid/02337_2018a_porb.png
http://www.asu.cas.cz/~asteroid/02337_2018a_p1.png

More high-quality data for both events are needed to nail it down (don't bother in sub-optimal conditions). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-11 1.25 0.250
2018-12-11 17.35 0.250
2018-12-12 9.45 0.250
2018-12-13 1.55 0.250
2018-12-13 17.65 0.250
2018-12-14 9.75 0.250
2018-12-15 1.85 0.250
2018-12-15 17.95 0.250
2018-12-16 10.05 0.250
2018-12-17 2.15 0.250
2018-12-17 18.25 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2018-12-10 17.19 0.750
2018-12-11 9.29 0.750
2018-12-12 1.39 0.750
2018-12-12 17.49 0.750
2018-12-13 9.59 0.750
2018-12-14 1.69 0.750
2018-12-14 17.79 0.750
2018-12-15 9.89 0.750
2018-12-16 1.99 0.750
2018-12-16 18.09 0.750
2018-12-17 10.19 0.750

Clear Skies, Petr [2018-12-10 15:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 22:40, Dec 4 UT.
Don [2018-12-05 00:55, Sugarloaf]

· Vladimir Benishek observed this off-list target from Sopot on 5 nights, found a second period there. Following solution is still a bit weak:
http://www.asu.cas.cz/~asteroid/02337_p1.png
http://www.asu.cas.cz/~asteroid/02337_p2.png

Vladimir would appreciate a help. More data with errors 0.01 mag are needed; don't bother in sub-optimal conditions. And only long sessions will likely be useful.

Clear Skies, Petr [2018-12-03 08:04, Ondrejov] Message sent to BinAstPhotSurvey conference

(2162) Anhui (Finished) [Add new note]
· This new target was observed by Marc Deldem from Les Barres and by Vladimir Benishek from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02162.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2019-01-02 12:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this new target on Dec. 1-2, 21:10-04:54 UT.
Vladimir [2018-12-02 15:58, Sopot AO]

(2178) Kazakhstania (Finished) - binary [Add new note]
· Campaign closed. [2018-12-19 14:14, Ondrejov]

· Follow-up observations (with errors <= 0.02 mag) would be useful for future modeling of this binary; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-11-26 10.02 0.251
2018-11-27 4.53 0.251
2018-11-27 23.03 0.251
2018-11-28 17.54 0.251
2018-11-29 12.04 0.251
2018-11-30 6.54 0.251
2018-12- 1 1.05 0.251
2018-12- 1 19.55 0.251
2018-12- 2 14.06 0.251
2018-12- 3 8.56 0.251
2018-12- 4 3.06 0.251
2018-12- 4 21.57 0.251
2018-12- 5 16.07 0.251
2018-12- 6 10.58 0.251
2018-12- 7 5.08 0.251
2018-12- 7 23.58 0.251
2018-12- 8 18.09 0.251
2018-12- 9 12.59 0.251
2018-12-10 7.10 0.251
2018-12-11 1.60 0.251
2018-12-11 20.10 0.251
2018-12-12 14.61 0.251
2018-12-13 9.11 0.251
2018-12-14 3.62 0.251
2018-12-14 22.12 0.251
2018-12-15 16.62 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2018-11-26 0.78 0.752
2018-11-26 19.29 0.752
2018-11-27 13.79 0.752
2018-11-28 8.29 0.752
2018-11-29 2.80 0.752
2018-11-29 21.30 0.752
2018-11-30 15.81 0.752
2018-12- 1 10.31 0.752
2018-12- 2 4.81 0.752
2018-12- 2 23.32 0.752
2018-12- 3 17.82 0.752
2018-12- 4 12.33 0.752
2018-12- 5 6.83 0.752
2018-12- 6 1.33 0.752
2018-12- 6 19.84 0.752
2018-12- 7 14.34 0.752
2018-12- 8 8.85 0.752
2018-12- 9 3.35 0.752
2018-12- 9 21.85 0.752
2018-12-10 16.36 0.752
2018-12-11 10.86 0.752
2018-12-12 5.37 0.752
2018-12-12 23.87 0.752
2018-12-13 18.37 0.752
2018-12-14 12.88 0.752
2018-12-15 7.38 0.752

Clear Skies, Petr [2018-11-22 12:13, Ondrejov]

· Our announcement on this one has appeared on CBET 4563, copied below for your convenience.

Follow-up observations (with errors <= 0.02 mag) would be useful for future modeling of the binary. Event ephemeris is further down below.

Cheers, Petr

(2178) KAZAKHSTANIA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
and K. Hornoch, Ondrejov Observatory; V. Chiorny, Kharkiv Observatory; F.
Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; A. Aznar, Astronomia
Para Todos Observatories Group, Spain; and V. Casanova, Observatorio de Sierra
Nevada, Instituto de Astrofisica de Andalucia, Consejo Superior de
Investigaciones Cientificas, report that photometric observations taken with a
0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope at the
Ondrejov Observatory, a 0.70-m telescope at the Chuguev station of the Kharkiv
Observatory in Ukraine, a 0.35-m telescope at the Organ Mesa Observatory, and
a 0.90-m telescope at Sierra Nevada Observatory during Sept. 18-Oct. 15 reveal
that minor planet (2178) is a binary system with an orbital period of 18.504
Â± 0.006 hr. The primary shows a period of 3.0183 Â± 0.0002 hr and has a
light-curve amplitude of 0.31 mag at solar phases 8-11 degrees. Mutual
eclipse/occultation events that are 0.07 to 0.15 magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.26 Â± 0.02. The secondary
appears synchronous and has a light-curve amplitude (in the combined primary
plus secondary light curve) of 0.02 mag, suggesting a moderately elongated
shape with the equatorial axis ratio of 1.3 Â± 0.1.

2018 October 18 (CBET 4563) Daniel W. E. Green

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-19 15.35 0.252
2018-10-20 9.85 0.252
2018-10-21 4.35 0.252
2018-10-21 22.86 0.252
2018-10-28 2.89 0.252
2018-10-28 21.39 0.252
2018-10-29 15.90 0.252
2018-10-30 10.40 0.252
2018-10-31 4.91 0.252
2018-10-31 23.41 0.252
2018-11- 1 17.91 0.252
2018-11- 2 12.42 0.252
2018-11- 3 6.92 0.252
2018-11- 4 1.43 0.252
2018-11- 4 19.93 0.252
2018-11- 5 14.43 0.252
2018-11- 6 8.94 0.252
2018-11- 7 3.44 0.252
2018-11- 7 21.95 0.252
2018-11- 8 16.45 0.252
2018-11- 9 10.95 0.252
2018-11-10 5.46 0.252
2018-11-10 23.96 0.252
2018-11-11 18.47 0.252
2018-11-12 12.97 0.252
2018-11-13 7.47 0.252
2018-11-14 1.98 0.252
2018-11-14 20.48 0.252
2018-11-15 14.99 0.252
2018-11-16 9.49 0.252
2018-11-17 3.99 0.252
2018-11-17 22.50 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-19 6.07 0.751
2018-10-20 0.57 0.751
2018-10-20 19.08 0.751
2018-10-21 13.58 0.751
2018-10-28 12.12 0.751
2018-10-29 6.62 0.751
2018-10-30 1.12 0.751
2018-10-30 19.63 0.751
2018-10-31 14.13 0.751
2018-11- 1 8.64 0.751
2018-11- 2 3.14 0.751
2018-11- 2 21.64 0.751
2018-11- 3 16.15 0.751
2018-11- 4 10.65 0.751
2018-11- 5 5.16 0.751
2018-11- 5 23.66 0.751
2018-11- 6 18.16 0.751
2018-11- 7 12.67 0.751
2018-11- 8 7.17 0.751
2018-11- 9 1.68 0.751
2018-11- 9 20.18 0.751
2018-11-10 14.68 0.751
2018-11-11 9.19 0.751
2018-11-12 3.69 0.751
2018-11-12 22.20 0.751
2018-11-13 16.70 0.751
2018-11-14 11.20 0.751
2018-11-15 5.71 0.751
2018-11-16 0.21 0.751
2018-11-16 18.72 0.751
2018-11-17 13.22 0.751

Clear Skies, Petr [2018-10-19 05:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/02178_2018a_porb.png
http://www.asu.cas.cz/~asteroid/02178_2018a_p1.png
http://www.asu.cas.cz/~asteroid/02178_2018b_porb.png
http://www.asu.cas.cz/~asteroid/02178_2018b_p1.png
http://www.asu.cas.cz/~asteroid/02178_2018c_porb.png
http://www.asu.cas.cz/~asteroid/02178_2018c_p1.png

It's ready for a CBET. Going to draft our report.

Cheers, Petr [2018-10-15 07:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on 10/11 Oct from 16:40 to 21:30 UT. Vasilij Ch. [2018-10-11 11:25, Kharkiv] Message sent to observers

· Observed on 9/10 Oct from 21:30 to 02:30 UT. Vasilij Ch. [2018-10-10 02:35, Kharkiv]

· Current data for this one:
http://www.asu.cas.cz/~asteroid/02178_2018a_porb.png
http://www.asu.cas.cz/~asteroid/02178_2018a_p1.png
http://www.asu.cas.cz/~asteroid/02178_2018b_porb.png
http://www.asu.cas.cz/~asteroid/02178_2018b_p1.png

P_orb is unique now. One more coverage (errors < 0.02 mag) of the secondary event is needed before we publish this one on CBET; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-10- 6 12.74 0.254
2018-10- 7 7.24 0.254
2018-10- 8 1.74 0.254
2018-10- 8 20.24 0.254
2018-10- 9 14.74 0.254
2018-10-10 9.24 0.254
2018-10-11 3.74 0.254
2018-10-11 22.24 0.254
2018-10-12 16.74 0.254
2018-10-13 11.24 0.254
2018-10-14 5.74 0.254
2018-10-15 0.24 0.254
2018-10-15 18.74 0.254
2018-10-16 13.24 0.254
2018-10-17 7.74 0.254
2018-10-18 2.24 0.254
2018-10-18 20.74 0.254
2018-10-19 15.24 0.254
2018-10-20 9.74 0.254
2018-10-21 4.24 0.254
2018-10-21 22.74 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2018-10- 6 22.16 0.763
2018-10- 7 16.66 0.763
2018-10- 8 11.16 0.763
2018-10- 9 5.66 0.763
2018-10-10 0.16 0.763
2018-10-10 18.66 0.763
2018-10-11 13.16 0.763
2018-10-12 7.66 0.763
2018-10-13 2.16 0.763
2018-10-13 20.66 0.763
2018-10-14 15.16 0.763
2018-10-15 9.66 0.763
2018-10-16 4.16 0.763
2018-10-16 22.66 0.763
2018-10-17 17.16 0.763
2018-10-18 11.66 0.763
2018-10-19 6.16 0.763
2018-10-20 0.66 0.763
2018-10-20 19.16 0.763
2018-10-21 13.66 0.763

Clear Skies, Petr [2018-10-06 06:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary. A lc decomposition (still somewhat tentative):
http://www.asu.cas.cz/~asteroid/02178_2018a_porb.png
http://www.asu.cas.cz/~asteroid/02178_2018a_p1.png
P_orb is not entirely unique yet. Vladimir would appreciate a help from people here. Data with errors <= 0.02 mag are needed and long sessions are preferred.

Clear Skies, Petr [2018-10-02 05:30, Ondrejov] Message sent to BinAstPhotSurvey conference

(2535) Hameenlinna (Finished) - binary [Add new note]
· Russ Durkee observed this binary system from Shed of Science South Observatory on 5 nights in its current apparition. There are present the two rotational lightcurves, but no prominent mutual events.
http://www.asu.cas.cz/~asteroid/02535_2018_porb.png
http://www.asu.cas.cz/~asteroid/02535_2018_p1.png
The system is apparently away from eclipse geometry now. This provides a constraint for its future modeling.
Target closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Russ!

Petr [2018-12-19 10:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started about 2UT on 12/18

Russ [2018-12-18 02:58, Shed of Science] Message sent to observers

· Started about 4:30 UT 12/15

Russ [2018-12-15 04:48, Shed of Science]

· Started at 2 UT 12/10 will run until about 10UT

Russ [2018-12-10 02:11, Shed of Science] Message sent to observers

· Started 3:40 UT 12/4 will run until about 10UT

Russ [2018-12-04 03:42, Shed of Science] Message sent to BinAstPhotSurvey conference

· Done in 2nd apparition. Will need a third one to do orbital model. [2017-09-07 07:34, Ondrejov]

· observed on 7 nights during the last 2 weeks 06/24,06/29,06/30,07/01,07/05,07/06,07/18 [2017-07-20 09:07, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· The discovery apparition is over for this one.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-04-20 09:32, Ondrejov]

· More data would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 3-26 23.29 0.276
2016- 3-27 20.52 0.276
2016- 3-28 17.75 0.276
2016- 3-29 14.98 0.276
2016- 3-30 12.21 0.276
2016- 3-31 9.44 0.276
2016- 4- 1 6.67 0.276
2016- 4- 2 3.90 0.276
2016- 4- 3 1.13 0.276
2016- 4- 3 22.36 0.276
2016- 4- 4 19.59 0.276
2016- 4- 5 16.82 0.276
2016- 4- 6 14.05 0.276
2016- 4- 7 11.28 0.276
2016- 4- 8 8.51 0.276
2016- 4- 9 5.74 0.276
2016- 4-10 2.97 0.276
2016- 4-11 0.20 0.276
2016- 4-11 21.43 0.276
2016- 4-12 18.66 0.276

Date/Time UTC (LTc.) Phase
--------------------------
2016- 3-26 12.66 0.775
2016- 3-27 9.89 0.775
2016- 3-28 7.12 0.775
2016- 3-29 4.35 0.775
2016- 3-30 1.58 0.775
2016- 3-30 22.81 0.775
2016- 3-31 20.04 0.775
2016- 4- 1 17.27 0.775
2016- 4- 2 14.50 0.775
2016- 4- 3 11.73 0.775
2016- 4- 4 8.96 0.775
2016- 4- 5 6.19 0.775
2016- 4- 6 3.42 0.775
2016- 4- 7 0.65 0.775
2016- 4- 7 21.88 0.775
2016- 4- 8 19.11 0.775
2016- 4- 9 16.34 0.775
2016- 4-10 13.57 0.775
2016- 4-11 10.80 0.775
2016- 4-12 8.03 0.775
2016- 4-13 5.26 0.775

Clear Skies, Petr [2016-03-17 12:35, Ondrejov]

· Our binary discovery announcement on this one has appeared on CBET 4262, copied below for your convenience.

Cheers, Petr

(2535) H{"A}MEENLINNA
V. Benishek, Belgrade Astronomical Observatory; D. Pray, Sugarloaf
Mountain Observatory, South Deerfield, MA, U.S.A.; P. Pravec, P. Kusnirak,
K. Hornoch, H. Kucakova, and J. Vrastil, Ondrejov Observatory; J. Pollock,
Appalachian State University; R. Groom and K. Stranger, Perth Observatory;
A. Carbognani, Astronomical Observatory of the Aosta Valley Autonomous
Region, Italy; R. Montaigut and A. Leroy, OPERA Observatory, France; and D.
Reichart and J. Haislip, University of North Carolina, Chapel Hill, report
that photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.65-m telescope at the Ondrejov Observatory, a 0.36-m
telescope at the Perth Observatory, a 0.81-m telescope at the Observatory
of the Aosta Valley Autonomous Region, and a 0.20-m telescope at the OPERA
Observatory during 2015 Dec. 18-2016 Feb. 19 reveal that minor planet (2535)
is a binary system with an orbital period of 21.23 Â± 0.01 hr. The primary
shows a period of 3.23106 Â± 0.00006 hr and has a lightcurve amplitude of
0.10 mag at solar phases 2-8 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.05- to 0.10-magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.22. The secondary is synchronous, and it has an amplitude of 0.03 mag in
the observed lightcurve, suggesting a secondary elongation of about 1.5
after removing contribution of light from the primary.

2016 February 25 (CBET 4262) Daniel W. E. Green [2016-02-27 08:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for the binary:
http://www.asu.cas.cz/~asteroid/02535_2016b_porb.png
http://www.asu.cas.cz/~asteroid/02535_2016b_p1.png
http://www.asu.cas.cz/~asteroid/02535_2016a_porb.png
http://www.asu.cas.cz/~asteroid/02535_2016a_p1.png
We have submitted our discovery announcement to CBET.

More data would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2-26 18.66 0.274
2016- 2-27 15.89 0.274
2016- 2-28 13.12 0.274
2016- 2-29 10.35 0.274
2016- 3- 1 7.58 0.274
2016- 3- 2 4.81 0.274
2016- 3- 3 2.04 0.274
2016- 3- 3 23.27 0.274
2016- 3- 4 20.50 0.274
2016- 3- 5 17.73 0.274
2016- 3- 6 14.96 0.274
2016- 3- 7 12.19 0.274
2016- 3- 8 9.42 0.274
2016- 3- 9 6.65 0.274
2016- 3-10 3.88 0.274
2016- 3-11 1.11 0.274
2016- 3-11 22.34 0.274
2016- 3-12 19.57 0.274
2016- 3-13 16.80 0.274
2016- 3-14 14.03 0.274
2016- 3-15 11.26 0.274
2016- 3-16 8.49 0.274

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2-26 8.07 0.775
2016- 2-27 5.30 0.775
2016- 2-28 2.53 0.775
2016- 2-28 23.76 0.775
2016- 2-29 20.99 0.775
2016- 3- 1 18.22 0.775
2016- 3- 2 15.45 0.775
2016- 3- 3 12.68 0.775
2016- 3- 4 9.91 0.775
2016- 3- 5 7.14 0.775
2016- 3- 6 4.37 0.775
2016- 3- 7 1.60 0.775
2016- 3- 7 22.83 0.775
2016- 3- 8 20.06 0.775
2016- 3- 9 17.29 0.775
2016- 3-10 14.52 0.775
2016- 3-11 11.75 0.775
2016- 3-12 8.98 0.775
2016- 3-13 6.21 0.775
2016- 3-14 3.44 0.775
2016- 3-15 0.67 0.775
2016- 3-15 21.90 0.775
2016- 3-16 19.13 0.775

Clear Skies, Petr [2016-02-22 14:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:45 UT, and hope to catch the secondary event at 6.13 UT. Not sure how the moonlight will effect things.
Don [2016-02-19 01:49, Sugarloaf] Message sent to observers

· I started a run on this at 01:00 UT and should catch the primary event at 6.67 UT.
Don [2016-02-15 01:11, Sugarloaf]

· I plan to start this at 01:40 UT, and should catch the primary event lc.

Don [2016-02-07 00:44, Sugarloaf] Message sent to observers

· I started this at 01:45 UT, and will record the primary lightcurve. [2016-02-06 01:46, Sugarloaf]

· Joe Pollock captured another event with his run from Perth on 2016-01-31. The orbital period is likely 21.23 h; a decomposition:
http://www.asu.cas.cz/~asteroid/02535_porb.png
http://www.asu.cas.cz/~asteroid/02535_p1.png

More data (for both events) are needed to nail down P_orb as well as D_2/D_1; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2- 2 0.22 0.274
2016- 2- 2 21.45 0.274
2016- 2- 3 18.68 0.274
2016- 2- 4 15.91 0.274
2016- 2- 5 13.14 0.274
2016- 2- 6 10.37 0.274
2016- 2- 7 7.60 0.274
2016- 2- 8 4.83 0.274
2016- 2- 9 2.06 0.274
2016- 2- 9 23.29 0.274
2016- 2-10 20.52 0.274
2016- 2-11 17.75 0.274
2016- 2-12 14.98 0.274
2016- 2-13 12.21 0.274
2016- 2-14 9.44 0.274
2016- 2-15 6.67 0.274
2016- 2-16 3.90 0.274
2016- 2-17 1.13 0.274
2016- 2-17 22.36 0.274
2016- 2-18 19.59 0.274

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2- 1 13.53 0.770
2016- 2- 2 10.76 0.770
2016- 2- 3 7.99 0.770
2016- 2- 4 5.22 0.770
2016- 2- 5 2.45 0.770
2016- 2- 5 23.68 0.770
2016- 2- 6 20.91 0.770
2016- 2- 7 18.14 0.770
2016- 2- 8 15.37 0.770
2016- 2- 9 12.60 0.770
2016- 2-10 9.83 0.770
2016- 2-11 7.06 0.770
2016- 2-12 4.29 0.770
2016- 2-13 1.52 0.770
2016- 2-13 22.75 0.770
2016- 2-14 19.98 0.770
2016- 2-15 17.21 0.770
2016- 2-16 14.44 0.770
2016- 2-17 11.67 0.770
2016- 2-18 8.90 0.770
2016- 2-19 6.13 0.770

Clear Skies, Petr [2016-02-01 12:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hana Kucakova and Kamil Hornoch took 6 hours worth of data for this one from here, captured a part of another event. P_orb is unclear yet (the value below was set just for plotting purpose), more data ---thorough coverage--- is needed.
http://www.asu.cas.cz/~asteroid/02535_porb.png
http://www.asu.cas.cz/~asteroid/02535_p1.png

Clear Skies, Petr [2016-01-30 05:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing at 5:30 UTC. Should be able to observe till 13:00 UTC. [2016-01-21 05:33, Vishnu Reddy/Tucson] Message sent to observers

· Observations by Vladimir Benishek from Sopot, by Don Pray from Sugarloaf Mountain, and by Joe Pollock from Perth have revealed this new target to be a new binary candidate. A current decomposition:
http://www.asu.cas.cz/~asteroid/02535_porb.png
http://www.asu.cas.cz/~asteroid/02535_p1.png
(P_orb has not been determined yet, the value in the first plot above was set just for plotting purpose.)

More data are needed to nail down.

Clear Skies, Petr [2016-01-20 07:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed by Vladimir Benishek from Sopot on two nights and by Don Pray from Sugarloaf Mountain on one night. The two recent nights suggest a possible period around 6 hours, but it is not unique (and it's also possible that the lightcurve has actually more than one component); a tentative fit:
http://www.asu.cas.cz/~asteroid/02535.png
The December night cannot be joined in uniquely (might be due to an evolution of the lightcurve), see it at
http://www.asu.cas.cz/~asteroid/02535_20151218.png

There are not favorable weather forecasts for Vladimir's and Don's stations for several next nights, so they would appreciate someone here to help out with this object.

Clear Skies, Petr [2016-01-14 14:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a run on this on Jan 12 UT.
Don [2016-01-12 19:39, Sugarloaf]

· I observed this new target on Dec. 17-18, 22:57-04:35 UT.
Vladimir [2015-12-20 16:05, Sopot AO] Message sent to BinAstPhotSurvey conference

(100088) 1993 DC (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/100088.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-12-14 08:27, Ondrejov] Message sent to BinAstPhotSurvey conference

(136568) 1980 XB (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot on 3 nights: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/136568.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Vladimir.

Petr [2018-12-13 13:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Dec. 1-2, 21:20-04:39 UT.
Vladimir [2018-12-02 16:02, Sopot AO]

(4710) Wade (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on 2 nights: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04710.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Don.

Petr [2018-12-12 09:00, Ondrejov] Message sent to BinAstPhotSurvey conference

(36445) Smalley (Finished) [Add new note]
· observed on 11/16, 11/25, 11/30, 12/01. data sent in with period of 2.53h [2018-12-02 19:30, Blue Mountains Obs] Message sent to observers

· Julian Oey observed this new target: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/36445.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Good work, Julian.

Petr [2018-12-02 10:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 11/16, 11/25, 11/30, 12/01. data sent in with period of 2.53h [2018-12-02 01:40, Blue Mountains Obs] Message sent to observers

· observed on 11/12 and 11/04. looks like a slow rotator [2018-11-14 00:53, Blue Mountains Obs]

· observed on 11/10 [2018-11-11 08:38, Blue Mountains Obs]

· start a new target 11/08 [2018-11-08 20:20, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(1967) Menzel (Finished) [Add new note]
· Binary suspect, needs to be confirmed in the future. Petr [2018-11-22 11:29, Ondrejov]

· Start a new target 07/21 [2018-07-21 12:05, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Done in 4th apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm [2017-04-27 08:49, Ondrejov]

· Started run from Perth at 1300 UT. Hope to get about 7 hours. Joe [2015-10-12 14:24, Dark Sky & PROMPT] Message sent to observers

· Observed on Sep. 23-24, 21:06 - 02:34 UT.
Vladimir [2015-09-24 12:54, Sopot AO]

· Observed last night (Sep. 22-23, 20:36 - 03:26 UT) from Sopot.
Vladimir [2015-09-23 10:37, Sopot AO] Message sent to observers

· Did six hour run (0400-1000 UT)on this returning "prime suspect" from Dark Sky last night. Did five hour run (1550-2100 UT)from Perth today. Joe [2015-09-17 02:01, Dark Sky & PROMPT]

· Don has done this "prime suspect" on four nights in this 3rd apparition: The data agree well with results from 2005 and 2007, no deviation from the single periodicity seen,
http://www.asu.cas.cz/~asteroid/01967_b0.png
Target closed now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2010-01-20 09:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start a run on this at 04:30 UT.
Don [2010-01-15 03:08, CarbuncleHill]

· Plan to start a run at 04:45 UT.
Don [2010-01-11 03:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Plan to start this at 04:50 UT.

Don [2010-01-09 23:01, CarbuncleHill]

· This "primary suspect" (for being a binary missed in its first apparition in the BinAstPhotSurvey) has been done
well by David from Hunters Hill (5 nights) and by Peter K. from here (1 night) in its second apparition for the Survey: The period estimates from the two apparitions, 2.8350 +/- 0.0005 and 2.8344 +/- 0.0002 h are in a nice agreement, good coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/01967_2007.png
It is finished for the Survey again, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, David and Peter, on the follow-up target.

Cheers, Petr [2007-04-15 09:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:54UT to 17:38UT in varing conditions. Data refines the period to 2.8346 +/- 0.0003hrs with an amplitude of 0.25 +/- 0.02mag. No deviations seen. Data sent to Petr. [2007-04-15 02:36, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 09:32UT to 12:34UT in reasonable conditions. Short session refined the period to 2.8345 +/- 0.0007hrs with an amplitude of 0.25 +/0 0.02 mag No deviations detected. [2007-04-12 22:36, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:06UT to 11:52UT in average conditions when night cut short by cloud. Period refined to 2.8358 +/- 0.0008hrs with an amplitude of 0.25 +/- 0.01mag. Waiting for a full night run to close this one off. [2007-04-11 22:13, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 09:50UT to 17:57UT in reasonable conditions. Refined period to 2.835 +/- 0/002 hrs with an amplitude of 0.25 +/- 0.01 mag. No deviations noted as yet. [2007-04-10 23:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:17UT to 13:50UT when shut down by heavy cloud. Good data reveals a period of 2.86 +/- 0.04hrs with an amplitude of 0.16 +/- 0.01mag. [2007-04-08 06:15, HuntersHill]

· Observing from 0 UT. Peter K. [2007-04-08 00:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Dear all, I will try to observe (1967) Menzel from ~22UT up to ~02UT from Ondrejov if weather will to cooperate.
Best wishes, Kamil [2007-04-05 17:33, Ondrejov]

· Don Pray has obtained three consecutive nights for this one, got a unique period solution, multiple coverage, no deviation see. An exemplary piece of work, Don!

A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-09-26 14:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· I obtained two runs on this so far. It's period appears to be around 2.83h. I'll observe it again tonight. [2005-09-24 20:23, CarbuncleHill]

· I'm starting this tonight, although clouds will cut the night short. [2005-09-23 02:57, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(457260) 2008 RY24 (Finished) [Add new note]
· This new target (NEA) was observed by Peter Kusnirak and Hana Kucakova from here and by Don Pray from Sugarloaf Mountain. Thanks to the high quality of the data, it is a good solution despite the low amplitude. Good coverage and no deviation apparent.
http://www.asu.cas.cz/~asteroid/457260.png
http://www.asu.cas.cz/~asteroid/457260_nsp.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Good work, guys.

Petr [2018-11-21 14:13, Ondrejov] Message sent to BinAstPhotSurvey conference

(18527) 1996 VJ30 (Finished) - binary [Add new note]
· Discovery apparition finished. [2018-11-21 10:15, Ondrejov]

· Follow-up observations (with errors <= 0.02 mag) of this new binary would be useful for its future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-16 12.52 0.253
2018-10-17 7.59 0.253
2018-10-18 2.66 0.253
2018-10-18 21.73 0.253
2018-10-19 16.80 0.253
2018-10-28 10.57 0.253
2018-10-29 5.64 0.253
2018-10-30 0.71 0.253
2018-10-30 19.78 0.253
2018-10-31 14.85 0.253
2018-11- 1 9.92 0.253
2018-11- 2 4.99 0.253
2018-11- 3 0.06 0.253
2018-11- 3 19.13 0.253
2018-11- 4 14.20 0.253
2018-11- 5 9.27 0.253
2018-11- 6 4.34 0.253
2018-11- 6 23.41 0.253
2018-11- 7 18.48 0.253
2018-11- 8 13.55 0.253
2018-11- 9 8.62 0.253
2018-11-10 3.69 0.253
2018-11-10 22.76 0.253
2018-11-11 17.83 0.253
2018-11-12 12.90 0.253
2018-11-13 7.97 0.253
2018-11-14 3.04 0.253
2018-11-14 22.11 0.253
2018-11-15 17.18 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2018-10-16 22.17 0.759
2018-10-17 17.24 0.759
2018-10-18 12.31 0.759
2018-10-19 7.38 0.759
2018-10-28 1.15 0.759
2018-10-28 20.22 0.759
2018-10-29 15.29 0.759
2018-10-30 10.36 0.759
2018-10-31 5.43 0.759
2018-11- 1 0.50 0.759
2018-11- 1 19.57 0.759
2018-11- 2 14.64 0.759
2018-11- 3 9.71 0.759
2018-11- 4 4.78 0.759
2018-11- 4 23.85 0.759
2018-11- 5 18.92 0.759
2018-11- 6 13.99 0.759
2018-11- 7 9.06 0.759
2018-11- 8 4.13 0.759
2018-11- 8 23.20 0.759
2018-11- 9 18.27 0.759
2018-11-10 13.34 0.759
2018-11-11 8.41 0.759
2018-11-12 3.48 0.759
2018-11-12 22.55 0.759
2018-11-13 17.62 0.759
2018-11-14 12.69 0.759
2018-11-15 7.76 0.759

Clear Skies, Petr [2018-10-16 12:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement on this one has appeared on CBET 4562, copied below for your convenience.

Cheers, Petr

(18527) 1996 VJ30
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, K. Hornoch,
and P. Kusnirak, Ondrejov Observatory; J. Oey, Blue Mountains Observatory,
Leura, NSW, Australia; R. Groom, Darling Range Observatory, Perth, Western
Australia; V. Chiorny, Kharkiv Observatory; and N. Gaftonyuk, Crimean
Astrophysical Observatory, report that photometric observations taken with
a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope
at the Ondrejov Observatory, a 0.35-m telescope at the Blue Mountains
Observatory, a 0.30-m telescope at the Darling Range Observatory, a 0.70-m
telescope at the Chuguev station of the Kharkiv Observatory in Ukraine, and
a 1.0-m telescope at the Crimean Astrophysical Observatory during Sept.
16-Oct. 5 reveal that minor planet (18527) is a binary system with an orbital
period of 19.07 Â± 0.01 hr. The primary shows a period of 3.35290 Â±
0.00009 hr and has a lightcurve amplitude of 0.13 mag at solar phases 4-9
degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.10 to 0.21 magnitude deep indicate a secondary-to-primary
mean-diameter ratio of 0.32 Â± 0.02. The secondary appears synchronous and
has a lightcurve amplitude (in the combined primary plus secondary light
curve) of 0.04 mag, suggesting a moderately elongated shape with the
equatorial axis ratio of 1.4 Â± 0.1. The mean absolute R magnitude in the
Cousins system is H_R = 13.71 Â± 0.06, assuming the phase-relation slope
parameter G = 0.24 Â± 0.11.

2018 October 14 (CBET 4562) Daniel W. E. Green [2018-10-15 05:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one is ready for publication on CBET, we are preparing our announcement.
http://www.asu.cas.cz/~asteroid/18527_2018a_porb.png
http://www.asu.cas.cz/~asteroid/18527_2018a_p1.png

Follow-up observations (with errors <= 0.02 mag) would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-10- 7 18.77 0.254
2018-10- 8 13.84 0.254
2018-10- 9 8.91 0.254
2018-10-10 3.98 0.254
2018-10-10 23.05 0.254
2018-10-11 18.12 0.254
2018-10-12 13.19 0.254
2018-10-13 8.26 0.254
2018-10-14 3.33 0.254
2018-10-14 22.40 0.254
2018-10-15 17.47 0.254
2018-10-16 12.54 0.254
2018-10-17 7.61 0.254
2018-10-18 2.68 0.254
2018-10-18 21.75 0.254
2018-10-19 16.82 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2018-10- 7 9.24 0.755
2018-10- 8 4.31 0.755
2018-10- 8 23.38 0.755
2018-10- 9 18.45 0.755
2018-10-10 13.52 0.755
2018-10-11 8.59 0.755
2018-10-12 3.66 0.755
2018-10-12 22.73 0.755
2018-10-13 17.80 0.755
2018-10-14 12.87 0.755
2018-10-15 7.94 0.755
2018-10-16 3.01 0.755
2018-10-16 22.08 0.755
2018-10-17 17.15 0.755
2018-10-18 12.22 0.755
2018-10-19 7.29 0.755

Clear Skies, Petr [2018-10-07 08:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Updated solution from data taken for this one by Vladimir Benishek from Sopot, by Peter Kusnirak and Kamil Hornoch from here, by Julian Oey from Leura, and by Roger Groom from Perth:
http://www.asu.cas.cz/~asteroid/18527_2018a_porb.png
http://www.asu.cas.cz/~asteroid/18527_2018a_p1.png

Before we publish this one on CBET, just one more high-quality (errors < 0.02 mag) coverage of the secondary event is needed, to refine our D_2/D_1 estimate; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-10- 1 10.29 0.250
2018-10- 2 5.37 0.250
2018-10- 3 0.45 0.250
2018-10- 3 19.53 0.250
2018-10- 4 14.61 0.250
2018-10- 5 9.69 0.250
2018-10- 6 4.77 0.250
2018-10- 6 23.85 0.250
2018-10- 7 18.93 0.250
2018-10- 8 14.01 0.250
2018-10- 9 9.09 0.250
2018-10-10 4.17 0.250
2018-10-10 23.25 0.250
2018-10-11 18.33 0.250
2018-10-12 13.41 0.250
2018-10-13 8.49 0.250
2018-10-14 3.57 0.250
2018-10-14 22.65 0.250
2018-10-15 17.73 0.250
2018-10-16 12.81 0.250
2018-10-17 7.89 0.250
2018-10-18 2.97 0.250
2018-10-18 22.05 0.250
2018-10-19 17.13 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2018-10- 1 19.99 0.759
2018-10- 2 15.07 0.759
2018-10- 3 10.15 0.759
2018-10- 4 5.23 0.759
2018-10- 5 0.31 0.759
2018-10- 5 19.39 0.759
2018-10- 6 14.47 0.759
2018-10- 7 9.55 0.759
2018-10- 8 4.63 0.759
2018-10- 8 23.71 0.759
2018-10- 9 18.79 0.759
2018-10-10 13.87 0.759
2018-10-11 8.95 0.759
2018-10-12 4.03 0.759
2018-10-12 23.11 0.759
2018-10-13 18.19 0.759
2018-10-14 13.27 0.759
2018-10-15 8.35 0.759
2018-10-16 3.43 0.759
2018-10-16 22.51 0.759
2018-10-17 17.59 0.759
2018-10-18 12.67 0.759
2018-10-19 7.75 0.759

Clear Skies, Petr [2018-10-01 09:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our solution from the best data taken for this one by Vladimir Benishek from Sopot and by Peter Kusnirak and Kamil Hornoch from here:
http://www.asu.cas.cz/~asteroid/18527_2018a_porb.png
http://www.asu.cas.cz/~asteroid/18527_2018a_p1.png

One more coverage for each of the two events is needed before we publish this one on CBET. Errors <= 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018-10- 1 10.31 0.251
2018-10- 2 5.39 0.251
2018-10- 3 0.47 0.251
2018-10- 3 19.55 0.251
2018-10- 4 14.63 0.251
2018-10- 5 9.71 0.251
2018-10- 6 4.79 0.251
2018-10- 6 23.87 0.251
2018-10- 7 18.95 0.251
2018-10- 8 14.03 0.251
2018-10- 9 9.11 0.251
2018-10-10 4.19 0.251
2018-10-10 23.27 0.251
2018-10-11 18.35 0.251
2018-10-12 13.43 0.251
2018-10-13 8.51 0.251
2018-10-14 3.59 0.251
2018-10-14 22.67 0.251
2018-10-15 17.75 0.251
2018-10-16 12.83 0.251
2018-10-17 7.91 0.251
2018-10-18 2.99 0.251
2018-10-18 22.07 0.251
2018-10-19 17.15 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2018-10- 1 19.97 0.758
2018-10- 2 15.05 0.758
2018-10- 3 10.13 0.758
2018-10- 4 5.21 0.758
2018-10- 5 0.29 0.758
2018-10- 5 19.37 0.758
2018-10- 6 14.45 0.758
2018-10- 7 9.53 0.758
2018-10- 8 4.61 0.758
2018-10- 8 23.69 0.758
2018-10- 9 18.77 0.758
2018-10-10 13.85 0.758
2018-10-11 8.93 0.758
2018-10-12 4.01 0.758
2018-10-12 23.09 0.758
2018-10-13 18.17 0.758
2018-10-14 13.25 0.758
2018-10-15 8.33 0.758
2018-10-16 3.41 0.758
2018-10-16 22.49 0.758
2018-10-17 17.57 0.758
2018-10-18 12.65 0.758
2018-10-19 7.73 0.758

Clear Skies, Petr [2018-10-01 07:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on 30 Sept from 17:20 UT. Vasilij Ch. [2018-10-01 02:12, Kharkiv] Message sent to observers

· observed on 09/27 could effected by moon. [2018-09-29 09:20, Blue Mountains Obs]

· Observing from 22:45 UT and expecting 4-hours long run. Peter K. [2018-09-28 23:25, Ondrejov] Message sent to observers

· Roger and myself have worked on this target over 4 nights on 09/19, 09/20, 09/21, 09/22 and an event was captured in nearly every night. Must be a short orbital period binary?. [2018-09-28 22:27, Blue Mountains Obs] Message sent to observers

· Vladimir Benishek has observed this new target from Sopot on one full and two partial nights, found it to be a binary candidate. A tentative lc decomposition (P_orb has not been derived of course; the value below was set just for plotting purpose):
http://www.asu.cas.cz/~asteroid/18527_2018a_porb.png
http://www.asu.cas.cz/~asteroid/18527_2018a_p1.png

More data (errors <= 0.03 mag) are needed.

Clear Skies, Petr [2018-09-18 09:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this new target on 3 nights: Sep. 14, 02:13-03:02 UT; Sep. 16, 00:34-03:04 UT and Sep. 16-17, 19:34-03:08 UT.
Vladimir [2018-09-17 15:30, Sopot AO]

(52773) 1998 QU12 (Finished) [Add new note]
· Target closed. [2018-11-21 10:14, Ondrejov]

· observed on 10/02 [2018-11-04 20:16, Blue Mountains Obs] Message sent to observers

· Starting on this pair asteroid. One night per lunation [2018-09-17 13:09, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(59291) 1999 CJ56 (Finished) [Add new note]
· Julian Oey observed this new target from Leura: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/59291.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-11-20 09:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 11/11 and 11/12 [2018-11-16 09:51, Blue Mountains Obs] Message sent to observers

· Started this new target on 11/08 and 11/10 [2018-11-11 08:37, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2406) Orelskaya (Finished) [Add new note]
· Julian Oey and Roger Groom observed this new target from Leura and Perth: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02406.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-11-14 12:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 10/23, 10/27,10/28,10/29,10/30,11/01,11/04 [2018-11-05 12:31, Blue Mountains Obs] Message sent to observers

· started observing this new target. A bit later but still quite bright and able to do long sessions. [2018-10-03 09:34, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(21030) 1989 TZ11 (Finished) [Add new note]
· Don Pray observed this new target on three nights: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/21030.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-11-11 22:45, Ondrejov] Message sent to BinAstPhotSurvey conference

(14322) Shakura (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 3 and half nights: Reasonable solution, acceptable coverage, no prominent deviation.
http://www.asu.cas.cz/~asteroid/14322.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-11-11 22:24, Ondrejov] Message sent to BinAstPhotSurvey conference

(3592) Nedbal (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03592.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-11-10 01:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Did runs on this on Nov 8+9.
Don [2018-11-09 00:52, Sugarloaf]

· Planning to start this at 06:30 UT.
Don [2018-10-31 00:56, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this on Oct 17 and 19.

Don [2018-10-29 20:46, Sugarloaf]

(13154) Petermrva (Finished) [Add new note]
· This return "prime suspect" was observed by Julian Oey from Leura and by Walt Cooney from Starry Night Observatory in this 3rd apparition: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/13154_b8.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-11-08 20:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on 11/2 from Starry Night Observatory. [2018-11-06 22:12, Sonoita] Message sent to observers

· observed on 10/27, 10/29, 10/30 [2018-11-04 05:06, Blue Mountains Obs]

· Worked from Starry Night Observatory last night. -Walt [2018-10-28 15:16, Sonoita] Message sent to observers

· Started this "prime suspect' om 09/29 and 09/30 [2018-10-01 12:06, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This "prime suspect" (i.e., asteroid with P and A in a range where binaries are frequent) has been done by Kamil and Peter from here in its 2nd apparition: good coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/13154_a8.png
It is done for now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-09-09 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:50 UT. Peter K. [2008-09-08 20:26, Ondrejov] Message sent to observers

· I will start this primary suspect tonight. Best wishes, Kamil [2008-09-02 18:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been well done by Adrian et al. from Modra, unique solution with P=2.9850 h, well covered, no deviations seen. Well done for the Survey. I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Adrian et al.!

Cheers, Petr [2005-12-02 11:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· It is probably finished after my two short runs recently. As a bonus another asteroid of 17 magnitude was in the field of view. However, its period is not unambiguously determined.
Adrian [2005-12-02 10:01, Modra] Message sent to BinAstPhotSurvey conference

· As Adrian has noted, the data from Modra reveal a possible but not unique period around 3 hours, see:
http://www.asu.cas.cz/~ppravec/13154.png
More observations -two consecutive nights with at least one of them a full night- are needed to nail down the solution and to show whether it is strictly periodic or not.

Cheers, Petr [2005-11-21 09:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· I haven't mentioned my three photometric runs of the asteroid I discovered with my friend and former colleague in 1995. It is in the inner part of the MB and thus fits criteria for our common survey. Those runs are too isolated as this was an extra target during observations. P is nearly 3 h.

Adrian
(Sorry, I haven't denoted this asteroid in parenthesis and caused troubles) [2005-11-20 14:17, Modra] Message sent to BinAstPhotSurvey conference

(26029) 5565 P-L (Finished) [Add new note]
· Vladimir Benishek did this new target from Sopot: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/26029.png
The high amplitude of 1.40 mag at solar phases about 7 deg is unusual, but not really exceptional, we have seen similar objects before.
Target closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2018-11-01 07:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed on Oct.7-8 (20:32-03:21 UT).
Vladimir [2018-10-08 21:45, Sopot AO]

(2577) Litva (Finished) - returning system [Add new note]
· Closed for the apparition. [2018-10-24 09:10, Ondrejov]

· This return ternary system has been observed by Don Pray from Sugarloaf Mountain, by Romain Montaigut and Arnaud Leroy from OPERA, by Bruno Christmann, and by Vladimir Benishek from Sopot:
http://www.asu.cas.cz/~asteroid/02577_2018a_p1.png
http://www.asu.cas.cz/~asteroid/02577_2018a_p2.png
http://www.asu.cas.cz/~asteroid/02577_2018a_porb.png

More data (for both events) with errors < 0.02 mag would be useful for refined modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-19 15.26 0.250
2018- 9-28 14.12 0.250
2018- 9-30 1.93 0.250
2018-10- 1 13.74 0.250
2018-10- 3 1.55 0.250
2018-10- 4 13.36 0.250
2018-10- 6 1.17 0.250
2018-10- 7 12.98 0.250
2018-10- 9 0.79 0.250
2018-10-10 12.60 0.250
2018-10-12 0.41 0.250
2018-10-13 12.22 0.250
2018-10-15 0.03 0.250
2018-10-16 11.84 0.250
2018-10-17 23.65 0.250
2018-10-19 11.46 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-18 21.20 0.746
2018- 9-20 9.01 0.746
2018- 9-29 7.87 0.746
2018- 9-30 19.68 0.746
2018-10- 2 7.49 0.746
2018-10- 3 19.30 0.746
2018-10- 5 7.11 0.746
2018-10- 6 18.92 0.746
2018-10- 8 6.73 0.746
2018-10- 9 18.54 0.746
2018-10-11 6.35 0.746
2018-10-12 18.16 0.746
2018-10-14 5.97 0.746
2018-10-15 17.78 0.746
2018-10-17 5.59 0.746

Clear Skies, Petr [2018-09-18 10:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· This return ternary system was observed by Don Pray from Sugarloaf Mountain, by Romain Montaigut and Arnaud Leroy from OPERA, and by Bruno Christmann in the past week:
http://www.asu.cas.cz/~asteroid/02577_2018a_p1.png
http://www.asu.cas.cz/~asteroid/02577_2018a_p2.png
http://www.asu.cas.cz/~asteroid/02577_2018a_porb.png

More data (for both events) with errors < 0.02 mag would be useful for refined modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-11 10.14 0.245
2018- 9-12 21.95 0.245
2018- 9-14 9.76 0.245
2018- 9-15 21.57 0.245
2018- 9-17 9.38 0.245
2018- 9-18 21.19 0.245
2018- 9-20 9.00 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-10 16.21 0.745
2018- 9-12 4.02 0.745
2018- 9-13 15.83 0.745
2018- 9-15 3.64 0.745
2018- 9-16 15.45 0.745
2018- 9-18 3.26 0.745
2018- 9-19 15.07 0.745

Clear Skies, Petr [2018-09-10 08:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed it on two nights. We may have captured an event centered on 2018-09-03 23h13 TU. Planned to observe it the next night to confirm the event that should recur according to Porb = 35.815h.
Romain [2018-09-08 14:07, OPERA] Message sent to BinAstPhotSurvey conference

· Starting this one at 01:40 UT.
Don [2018-09-06 01:12, Sugarloaf]

· I'll be starting a run at 01:40 UT.
Don [2018-09-05 00:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· On Sep 3, I did the first run on this for its 4th apparition. Conditions were not the best.

Don [2018-09-03 19:22, Sugarloaf]

· The discovery of tertiary of (2577), confirming our inferrence from the lightcurve observations.

Merry Christmas!

Cheers, Petr

S/2012 (2577) 1
W. J. Merline, Southwest Research Institute (together with P.
M. Tamblyn, B. D. Warner, P. Pravec, J. P. Tamblyn, C. Neyman, A.
R. Conrad, W. M. Owen, B. Carry, J. D. Drummond, C. R. Chapman, B.
L. Enke, W. M. Grundy, C. Veillet, S. B. Porter, C. Arcidiacono, J.
C. Christou, D. D. Durda, A. W. Harris, H. A. Weaver, C. Dumas, D.
Terrell, and P. Maley) reports the discovery, using the Keck II
telescope (+ NIRC2 Laser-Guide-Star adaptive-optics system), of a
second satellite of the Hungaria-type minor planet (2577) Litva.
On 2012 June 22.3 UT, the satellite was found at p.a. 89 deg and
separation 0".229 (projected separation 230 km). At that time,
(2577) was 1.39 AU from the earth at magnitude V = 16.6. The
satellite has been imaged in the K_p, H, and J bands. It was also
detected on 2012 June 27, Aug. 11, and Aug. 16. Failure to detect
it on 2012 July 15 is now seen to be due to being in conjunction
with the primary. Follow-up observations were made at the Keck II
telescope on 2013 Aug. 25 and 26 by Merline, Tamblyn, Conrad, and
Tamblyn. Additional detections were made at the Large Binocular
Telescope by Veillet and Arcidiacono on Oct. 12 and at the Keck II
telescope by Grundy and Porter on Oct. 25, giving a total baseline
of 490 days. The best-fit orbit analysis indicates that the third
component has a semi-major axis of 378 km and an orbital period of
214 days; a period of half this length cannot be ruled out. Either
orbit would be among the longest periods known for main-belt
multiple systems and would be the most loosely bound. It resembles
other wide binary systems discovered by this same group (cf. Durda
et al. 2010, Proc. Lunar and Planet. Sci. Conf. 41, 2558; Jacobson
et al., Ap.J., submitted). The third component is about 2.6 mag
fainter than the combined brightness of the close inner pair.
Using H magnitudes to scale the size of (2577) from other E-type
objects of better-known size, the diameter of (2577) is estimated
to be about 4 km, implying a size for the new satellite of 1.2 km.
The first satellite of (2577) was inferred by Warner et al. (CBET
1715) in 2009 via lightcurve analysis; their estimate of the size
ratio was 0.35, meaning that the second component would be 1.4 km
diameter, based on the 4-km assumption for (2577), above. This
close inner pair is unresolvable in the imaging data reported
above. Warner et al. (2009, Minor Planet Bull. 36, 165) suggested
that a residual 5.7-hr lightcurve period may be due to rotation by
a third body -- an idea bolstered by Pravec et al. (2012, Icarus
218, 125), who found that this period was still evident even when
the secondary object was in eclipse. To the authors' knowledge,
S/2012 (2577) 1 is the only satellite to have been predicted prior
to being found by targeted imaging. Additional information is
provided on CBET 3765.

2013 December 22 (9267) Daniel W. E. Green

S/2012 (2577) 1
W. J. Merline, Southwest Research Institute (SwRI); P. M. Tamblyn, Binary
Astronomy, LLC, Dillon, CO, U.S.A., and SwRI; B. D. Warner, Center for Solar
System Studies, Landers, CA, USA; P. Pravec, Ondrejov Observatory; J. P.
Tamblyn, Binary Astronomy, LLC, Dillon, CO, U.S.A.; C. Neyman, W. M. Keck
Observatory; A. R. Conrad, Max Planck Institute for Astronomy; W. M. Owen, Jet
Propulsion Laboratory; B. Carry, Institut de Mecanique Celeste et de Calcul
des Ephemerides, Paris Observatory; J. D. Drummond, Starfire Optical Range,
Air Force Research Laboratory, Kirtland Air Force Base, Albuquerque, NM,
U.S.A.; C. R. Chapman and B. L. Enke, SwRI; W. M. Grundy, Lowell Observatory;
C. Veillet, Large Binocular Telescope Observatory (LBTO); S. B. Porter, Lowell
Observatory; C. Arcidiacono, Astronomical Observatory of Bologna, Istituto
Nazionale di Astrofisica; J. C. Christou, LBTO; D. D. Durda, SwRI; A. W.
Harris, "More Data!", La Canada, CA, USA; H. A. Weaver, Applied Physics
Laboratory, Johns Hopkins University; C. Dumas, European Southern Observatory,
Chile; D. Terrell, Sonoita Research Observatory and SwRI; and P. Maley,
Houston, TX, USA, report the discovery, using the Keck II telescope (+ NIRC2
Laser-Guide-Star adaptive-optics system), of a second satellite of the
Hungaria-type minor planet (2577) Litva. On 2012 June 22.3 UT, the satellite
was found at p.a. 89 deg and separation 0".229 (projected separation 230 km).
At that time, (2577) was 1.39 AU from the earth at magnitude V = 16.6. The
satellite has been imaged in the K_p, H, and J bands. It was also detected on
2012 June 27, Aug. 11, and Aug. 16. Failure to detect it on 2012 July 15,
despite excellent conditions, is now seen, in retrospect, to be due to being
in conjunction with the primary. Follow-up observations were made at the Keck
II telescope (+ LGS-AO) on 2013 Aug. 25 and 26 by Merline, Tamblyn, Conrad,
and Tamblyn. Additional detections were made at the Large Binocular Telescope
(adaptive secondary mirror and PISCES near-infrared camera at the "Right Front
Bent" Gregorian focus) by Veillet and Arcidiacono on 2013 Oct. 12 and at the
Keck II telescope (+ LGS-AO) by Grundy and Porter on 2013 Oct. 25, giving a
total baseline of 490 days.
The best-fit orbit analysis indicates that the third component has a
semi-major axis of 378 km and an orbital period of 214 days. Despite the
long baseline and the number of observational epochs, the phasing of the
observations is such that a period of half this length cannot be ruled out.
Either orbit would be among the longest periods known for main-belt binary/
multiple systems and would also be the most loosely bound. It resembles
other wide binary systems discovered by this same group (cf. Durda et al.
2010, Proc. Lunar and Planet. Sci. Conf. 41, 2558; Jacobson et al., Ap.J.,
submitted, as viewable at website URL http://lanl.arxiv.org/abs/1311.4887).
The third component is about 2.6 mag fainter than the combined brightness of
the close inner pair. Using H magnitudes to scale the size of (2577) from
other E-type objects of better-known size, the diameter of (2577) is estimated
to be about 4 km, implying a size for the new satellite of 1.2 km.
The first satellite of (2577) was discovered by Warner et al. (CBET 1715)
in 2009, by lightcurve analysis, revealing eclipses/occultations by a close
secondary, having an orbital period of 35.9 hr; their estimate of the size
ratio was 0.35, meaning that the second component would be 1.4 km diameter,
based on the 4-km assumption for (2577), above. This close inner pair is
unresolvable in the imaging data reported above. Warner et al. (2009, Minor
Planet Bull. 36, 165) suggested that a residual 5.7-hr lightcurve period may
be due to rotation by a third body, an idea further bolstered by Pravec et al.
(2012, Icarus 218, 125), who found that this period was still evident even
when the secondary object was in eclipse.
The observing program described here has given high priority to objects
suspected of having satellites. To the authors' knowledge, S/2012 (2577) 1 is
the only satellite to have been predicted prior to being found by targeted
imaging.

2013 December 22 (CBET 3765) Daniel W. E. Green [2013-12-24 11:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Closed for the 3rd apparition, we will update its model after completing absolute calibrations of the Ondrejov observations. Petr [2012-07-09 12:07, Ondrejov]

· Observing from 21:00 UT in a relatively good conditions. Michal [2012-06-19 22:32, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 22:30 UT in a good conditions. Michal [2012-06-18 22:56, SkalnatePleso] [Remove]

· Observing from 20:20 UT in a good conditions. Michal [2012-06-17 20:40, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 20:00 UT, but without further prediction due to fluctuating cloud coverage. Michal [2012-06-15 21:10, SkalnatePleso] [Remove]

· This 3-period system was observed by Peter Kusnirak and Jan Vrastil from Ondrejov and by Walt Cooney et al. reasonably in the past lunation:
http://www.asu.cas.cz/~asteroid/02577_12b_porb.png
http://www.asu.cas.cz/~asteroid/02577_12b_p1.png
http://www.asu.cas.cz/~asteroid/02577_12b_p2.png
cf. with the data from the previous lunation:
http://www.asu.cas.cz/~asteroid/02577_12a_porb.png
http://www.asu.cas.cz/~asteroid/02577_12a_p1.png
http://www.asu.cas.cz/~asteroid/02577_12a_p2.png

Taking final data -covering each of the two events twice- in this month will complete this apparition for the system; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 6- 8 20.23 0.250
2012- 6-10 8.04 0.250
2012- 6-11 19.86 0.250
2012- 6-13 7.68 0.250
2012- 6-14 19.49 0.250
2012- 6-16 7.30 0.250
2012- 6-17 19.12 0.250
2012- 6-19 6.94 0.250
2012- 6-20 18.75 0.250
2012- 6-22 6.56 0.250
2012- 6-23 18.38 0.250
2012- 6-25 6.20 0.250
2012- 6-26 18.01 0.250
2012- 6-28 5.82 0.250
2012- 6-29 17.64 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2012- 6- 8 2.42 0.753
2012- 6- 9 14.24 0.753
2012- 6-11 2.05 0.753
2012- 6-12 13.87 0.753
2012- 6-14 1.68 0.753
2012- 6-15 13.50 0.753
2012- 6-17 1.31 0.753
2012- 6-18 13.13 0.753
2012- 6-20 0.94 0.753
2012- 6-21 12.76 0.753
2012- 6-23 0.57 0.753
2012- 6-24 12.39 0.753
2012- 6-26 0.20 0.753
2012- 6-27 12.02 0.753
2012- 6-28 23.83 0.753
2012- 6-30 11.65 0.753

Clear Skies, Petr [2012-06-01 15:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed tonight from 20:30 to 1:40, good conditions - uncertainties mostly ~0.01 mag. Honza [2012-05-19 01:58, Ondrejov] Message sent to observers

· Observed for almost 6 hours last night, covering 0.25-phase event but, unfortunatelly, some clouds came in second part of the event. Peter K. [2012-05-13 06:19, Ondrejov]

· Observing from 20:15 UT and should cover whole 0.25-phase event (if weather allows). Peter K. [2012-05-09 21:14, Ondrejov] Message sent to observers

· Great data in the first lunation of the current 3rd apparition of this system were taken by Jim Brinsfield from Via Capote, by Kamil Hornoch and Peter Kusnirak from here, by Jozef Vilagi and Stefan Gajdos from Modra, and by Marek Husarik and Michal Pikler from Skalnate Pleso. There are two rotational and an eclipse lightcurve components:
http://www.asu.cas.cz/~asteroid/02577_12_p1.png
http://www.asu.cas.cz/~asteroid/02577_12_p2.png
http://www.asu.cas.cz/~asteroid/02577_12_porb.png
The solution is in a perfect agreement with our results from the first two apparitions published in
http://dx.doi.org/10.1016/j.icarus.2011.11.026

Monitoring an evolution of the events -covering each of the two events twice- will be useful for refining its model; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 5- 9 23.67 0.245
2012- 5-11 11.48 0.245
2012- 5-12 23.29 0.245
2012- 5-14 11.10 0.245
2012- 5-15 22.91 0.245
2012- 5-17 10.72 0.245
2012- 5-18 22.53 0.245
2012- 5-20 10.34 0.245
2012- 5-21 22.15 0.245
2012- 5-23 9.96 0.245
2012- 5-24 21.77 0.245
2012- 5-26 9.58 0.245
2012- 5-27 21.39 0.245
2012- 5-29 9.20 0.245
2012- 5-30 21.01 0.245
2012- 6- 1 8.82 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2012- 5-10 17.56 0.745
2012- 5-12 5.37 0.745
2012- 5-13 17.18 0.745
2012- 5-15 4.99 0.745
2012- 5-16 16.80 0.745
2012- 5-18 4.61 0.745
2012- 5-19 16.42 0.745
2012- 5-21 4.23 0.745
2012- 5-22 16.04 0.745
2012- 5-24 3.85 0.745
2012- 5-25 15.66 0.745
2012- 5-27 3.47 0.745
2012- 5-28 15.28 0.745
2012- 5-30 3.09 0.745
2012- 5-31 14.90 0.745

Clear Skies, Petr [2012-05-02 12:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to work from SRO tonight. -Walt [2012-05-01 02:41, Sonoita] Message sent to observers

· Observing it from 22:46 UT on April 24, 2012.
Stefan [2012-04-25 00:43, Modra]

· Observing this one from 22:55UT. Hope to get some flatfields soon. Jozef, Stefan. [2012-04-21 23:26, Modra]

· This returning binary (observed in its 3rd apparition) was observed on 5 nights from ViaCapote and Ondrejov and current data are consistent with periods derived in 2009 and 2010.

http://www.asu.cas.cz/~asteroid/02577_12_p1.png
http://www.asu.cas.cz/~asteroid/02577_12_p2.png

Last two sessions revealed attenuations 0.10-0.11 mag deep.

http://www.asu.cas.cz/~asteroid/02577_12_porb.png

More observations covering mutual events as well as some orbital phases around them are needed to modeling of this binary system. Here is an ephemeris for couple of next days. Data with errors less than 0.015 mag are needed. Good luck!

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-20 14.32 0.250
2012- 4-22 2.13 0.250
2012- 4-23 13.94 0.250
2012- 4-25 1.75 0.250
2012- 4-26 13.56 0.250
2012- 4-28 1.37 0.250
2012- 4-29 13.18 0.250
2012- 5- 1 0.99 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-19 20.41 0.750
2012- 4-21 8.22 0.750
2012- 4-22 20.03 0.750
2012- 4-24 7.84 0.750
2012- 4-25 19.65 0.750
2012- 4-27 7.46 0.750
2012- 4-28 19.27 0.750
2012- 4-30 7.08 0.750
2012- 5- 1 18.89 0.750

Peter K. [2012-04-19 13:25, Ondrejov] Message sent to observers

· plan to observe tonight (UT19) from 06:30 t0 12:00UT [2012-04-18 13:33, Via Capote]

· Observing from 21:20 UT tonight. There are some high clouds in the sky but signal is good enough (errors ~0.01 mag). Peter K. [2012-04-17 21:33, Ondrejov] Message sent to observers

· observed this object under good conditions from 08:00 to 12:00UT [2012-04-16 13:41, Via Capote] Message sent to BinAstPhotSurvey conference

· The campaign on this Hungaria binary is over. The current dataset gives:
P_1 = 2.81258 +/- 0.00002 h (synodic-sidereal difference = 0.0003 h)
P_2 = 5.6842 +/- 0.0002 h (synodic-sidereal difference = 0.001 h)
P_orb = 35.81 +/- 0.01 h
A_1 = 0.24 mag
A_2 = 0.09 mag
D_2/D_1 > 0.34
http://www.asu.cas.cz/~asteroid/02577_p1.png
http://www.asu.cas.cz/~asteroid/02577_p2.png
http://www.asu.cas.cz/~asteroid/02577_porb.png
Brian plans to write up this for MPB by June.

Great work all!

Cheers, Petr [2009-04-07 10:52, Ondrejov] Message sent to observers

· Observed under changing conditions (local clouds). Adrian [2009-04-01 20:58, Modra] Message sent to BinAstPhotSurvey conference

· Observed 2009-03-28 from 9:28UT to 14:13UT in fair conditions. Data sent to Petr. [2009-03-28 21:56, HuntersHill] Message sent to observers

· Started at 01:00 UT.
Don [2009-03-26 03:37, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed 2009-03-23 from 08:59UT to 14:25UT in good conditions. Deviation noted but it does not coincide with event ephemeris - perhaps just the effect of P_2. [2009-03-23 21:02, HuntersHill] Message sent to observers

· Started at 02:15 UT to catch the 0.75 phase event.
Don [2009-03-23 02:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started about 0330 UT (March 22) [2009-03-22 04:28, PalmerDivide] Message sent to observers

· Getting short run (about 3 hr) ending at 0720 UT (March 21). [2009-03-21 07:00, PalmerDivide]

· Got continuous run 03/19-20 2350-0600 UT from Prompt covering entire event from ~0230-0530 UT. Joe [2009-03-20 07:48, Dark Sky & PROMPT] Message sent to observers

· Started about 0215 UT (March 18) [2009-03-18 02:46, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Observing from 20 UT. I should cover whole primary event but target is passing close to brighter star. I hope it will be not a problem. Peter K. [2009-03-17 20:20, Ondrejov] Message sent to observers

· Started about 0200 UT (March 17). [2009-03-17 03:42, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Starting run at 1:30 UT on 3/17. Weather is not too promising for a long run. But I might get coverage of the event tonight.

Russ [2009-03-17 01:32, Shed of Science] Message sent to observers

· Observed 2009.03.16 from 09:13UT to 15:09UT in reasonable conditions. [2009-03-16 20:47, HuntersHill]

· Starting this about 0215 UT (March 16). No events scheduled during run. [2009-03-16 02:47, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Starting about 0200 UT (March 15). Beware, Caeser. [2009-03-15 02:03, PalmerDivide]

· Have pre-event Prompt R run from 2340-0140 UT (March 13-14). GRB event now has the telescopes for the remainder of the night. Joe [2009-03-14 05:46, Dark Sky & PROMPT] Message sent to observers

· Have a run going, to catch event, but conditions may deteriorate before too long.

Russ [2009-03-14 02:22, Shed of Science]

· Will start this about 0200-0215 UT (March 14). [2009-03-14 01:38, PalmerDivide] Message sent to observers

· For this one, more data of a good quality for events would be good, to refine P_orb and D_2/D_1. The events coverage has been somewhat limited so far,
http://www.asu.cas.cz/~asteroid/02577_porb.png

Ephemeris for the events:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 3-14 23.00 0.255
2009- 3-16 10.75 0.255
2009- 3-17 22.50 0.255
2009- 3-19 10.25 0.255
2009- 3-20 22.00 0.255
2009- 3-22 9.75 0.255
2009- 3-23 21.50 0.255
2009- 3-25 9.25 0.255
2009- 3-26 21.00 0.255
2009- 3-28 8.75 0.255
2009- 3-29 20.50 0.255
2009- 3-31 8.25 0.255
2009- 4- 1 20.00 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2009- 3-14 4.93 0.750
2009- 3-15 16.68 0.750
2009- 3-17 4.43 0.750
2009- 3-18 16.18 0.750
2009- 3-20 3.93 0.750
2009- 3-21 15.68 0.750
2009- 3-23 3.43 0.750
2009- 3-24 15.18 0.750
2009- 3-26 2.93 0.750
2009- 3-27 14.68 0.750
2009- 3-29 2.43 0.750
2009- 3-30 14.18 0.750
2009- 4- 1 1.93 0.750
2009- 4- 2 13.68 0.750

Clear Skies, Petr [2009-03-13 13:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· The discovery announcement on the binary has appeared on CBET 1715.

Cheers, Petr

(2577) LITVA
B. D. Warner, Palmer Divide Observatory and Space Science Institute,
Colorado Springs, CO, U.S.A.; P. Pravec, Ondrejov Observatory; A. W. Harris,
Space Science Institute, La Canada, CA, U.S.A.; D. Higgins, Hunters Hill
Observatory, Ngunnawal, ACT, Australia; C. Bembrick, Mt. Tarana Observatory,
Bathurst, NSW, Australia; and J. Brinsfield, Via Capote Observatory, Thousand
Oaks, CA, U.S.A. report that photometric observations obtained during Feb.
28-Mar. 8 reveal that minor planet (2577) is a binary system with an orbital
period of 35.78 ± 0.05 hr. The primary shows a period of 2.8141 ± 0.0006
hr, and it has a lightcurve amplitude of 0.24 mag. Mutual eclipse/occultation
events indicate a secondary-to-primary mean-diameter ratio of 0.35 ± 0.02.
The periods and amplitudes were determined using a subset of data (Mar. 4-8).
Data on Feb. 28 and Mar. 1 show no events and fit the same primary period, but
the lightcurve has a slightly different shape; this may indicate that the
primary lightcurve is evolving with changing viewing aspect, and so additional
observations are warranted as the moon clears the area.

2009 March 11 (CBET 1715) Daniel W. E. Green [2009-03-12 07:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started about 0345 UT (March 12). Had to wait for the wind to die down. Will get only 2.5-3 hrs if conditions hold. [2009-03-12 04:13, PalmerDivide] Message sent to observers

· Started observing about 0200 UT (March 10) [2009-03-10 02:24, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Started observations about 0400 UT (March 8). [2009-03-08 04:19, PalmerDivide]

· Observation began 02:46UT under good conditions but with significant ambient moonlight [2009-03-08 02:50, Via Capote] Message sent to observers

· Observed 2009-03-07 from 9:52UT to 14:42UT in fair conditions (ended early due to cloud). I believe I may have caught an event of some type. [2009-03-07 21:07, HuntersHill]

· Observed 2009-03-06 from 09:47UT to 15:53UT in fair conditions. A little noisey perhaps indicating events but I will leave that to Brian and Petr to determine. Note that there were 4 star subtractions in the session, all in one short group around 13:00-13:40. [2009-03-07 00:19, HuntersHill] Message sent to observers

· Observations of 2577 Litva by myself, David Higgins, and Colim Bembrick have confirmed that this a binary asteroid. See Petr's thoughts below.

Observations are need from different locations. David and Colin have Australia (assuming good weather), so locations in Europe or equivalent longitudes are encouraged to join.
The moon will probably interfer for the next few days, but this should be a "top 10" item for the next dark period. It will be in the mid-15s near the equator at that time.

Very interesting! The attenuations are certainly real, and some of them occur separated by couple hours only they may be "double events", i.e., both occultations and eclipses occuring there, but spatially and therefore temporally separated at the solar phase of 23 deg). Intervals between them are, however, different, that may be due to orbit eccentricity or some other effects. Since it doesn't appear so simple as our usual binaries, more data are needed to get an understanding what is there

In following plot, the data are folded with an arbitrary second period, to illustrate that most of the attenuations have similar depths, ~0.15 mag, suggesting they are mutual events (possibly only partial) between same pair of bodies,

http://www.asu.cas.cz/~asteroid/02577.png

One attenuation, the one before the end of the March 5.2 session, is twice (or more) as deep. I don't know now how it could be caused by the same pair of bodies, if they produce spatially/temporally separated "double" events on other times.

Clearly, more data from stations spread around the world are needed to get understanding what is going on there. [2009-03-06 21:19, PalmerDivide] Message sent to BinAstPhotSurvey conference

(100015) 1989 SR7 (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4565, copied below for your convenience.

Cheers, Petr

(100015) 1989 SR7
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
K. Hornoch, and P. Kusnirak, Ondrejov Observatory; J. Oey, Blue Mountains
Observatory, Leura, NSW, Australia; R. Groom, Darling Range Observatory,
Perth, Western Australia; A. Aznar, Astronomia Para Todos Observatories Group,
Spain; and A. Sota, Observatorio de Sierra Nevada, Instituto de Astrofisica de
Andalucia-CSIC, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia, a 0.65-m telescope at the
Ondrejov Observatory, a 0.35-m telescope at the Blue Mountains Observatory, a
0.30-m telescope at the Darling Range Observatory, and a 0.90-m telescope at
the Sierra Nevada Observatory during Sept. 9-Oct. 12 reveal that minor planet
(100015) is a binary system with an orbital period of 20.65 Â± 0.01 hr. The
primary shows a period of 2.4172 Â± 0.0002 hr and has a lightcurve amplitude
of 0.05 mag at solar phases 7-22 degrees, suggesting a nearly spheroidal
shape. Mutual eclipse/occultation events that are 0.13 to 0.21 magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.35 Â± 0.02. The
mean absolute R magnitude in the Cousins system is H_R = 15.55 Â± 0.11,
assuming the phase-relation slope parameter G = 0.24 Â± 0.11.

2018 October 23 (CBET 4565) Daniel W. E. Green [2018-10-23 15:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our campaign on this new binary is over now, we have just submitted our report to CBAT. Our data:
http://www.asu.cas.cz/~asteroid/100015_2018a_porb.png
http://www.asu.cas.cz/~asteroid/100015_2018a_p1.png
http://www.asu.cas.cz/~asteroid/100015_2018a_p1nsp.png

Cheers, Petr [2018-10-19 06:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· 100015 Worked with last night with T90 Sierra Nevada Observatory [2018-09-30 08:16, IAO-Isaac Aznar Obs.] Message sent to observers

· (100015) 1989 SR7 worked last night, covering 6 hour session with T90 Sierra Nevada Observatory, Spain. [2018-09-29 08:13, IAO-Isaac Aznar Obs.]

· observed on 09/16,09/17,09/18 [2018-09-23 07:55, Blue Mountains Obs] Message sent to observers

· Current data for this one:
http://www.asu.cas.cz/~asteroid/100015_2018a_porb.png
http://www.asu.cas.cz/~asteroid/100015_2018a_p1.png

Before publishing it on CBET, we need to get one good coverage (errors about 0.02 mag) of the secondary event. A coverage of the primary event would be good as well, to refine the orbital period. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-20 23.06 0.251
2018- 9-28 16.91 0.251
2018- 9-29 13.56 0.251
2018- 9-30 10.21 0.251
2018-10- 1 6.86 0.251
2018-10- 2 3.51 0.251
2018-10- 3 0.16 0.251
2018-10- 3 20.81 0.251
2018-10- 4 17.46 0.251
2018-10- 5 14.11 0.251
2018-10- 6 10.76 0.251
2018-10- 7 7.41 0.251
2018-10- 8 4.06 0.251
2018-10- 9 0.71 0.251
2018-10- 9 21.36 0.251
2018-10-10 18.01 0.251
2018-10-11 14.66 0.251
2018-10-12 11.31 0.251
2018-10-13 7.96 0.251
2018-10-14 4.61 0.251
2018-10-15 1.26 0.251
2018-10-15 21.91 0.251
2018-10-16 18.56 0.251
2018-10-17 15.21 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-20 12.28 0.729
2018- 9-28 6.13 0.729
2018- 9-29 2.78 0.729
2018- 9-29 23.43 0.729
2018- 9-30 20.08 0.729
2018-10- 1 16.73 0.729
2018-10- 2 13.38 0.729
2018-10- 3 10.03 0.729
2018-10- 4 6.68 0.729
2018-10- 5 3.33 0.729
2018-10- 5 23.98 0.729
2018-10- 6 20.63 0.729
2018-10- 7 17.28 0.729
2018-10- 8 13.93 0.729
2018-10- 9 10.58 0.729
2018-10-10 7.23 0.729
2018-10-11 3.88 0.729
2018-10-12 0.53 0.729
2018-10-12 21.18 0.729
2018-10-13 17.83 0.729
2018-10-14 14.48 0.729
2018-10-15 11.13 0.729
2018-10-16 7.78 0.729
2018-10-17 4.43 0.729

Clear Skies, Petr [2018-09-20 12:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has observed this new target from Sopot on three full and three partial nights, found it to be a binary. A unique solution for P_orb:
http://www.asu.cas.cz/~asteroid/100015_2018a_porb.png
http://www.asu.cas.cz/~asteroid/100015_2018a_p1.png

More data (errors < 0.03 mag) for both events are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-16 15.81 0.250
2018- 9-17 12.47 0.250
2018- 9-18 9.13 0.250
2018- 9-19 5.79 0.250
2018- 9-20 2.45 0.250
2018- 9-20 23.11 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-17 2.13 0.750
2018- 9-17 22.79 0.750
2018- 9-18 19.45 0.750
2018- 9-19 16.11 0.750
2018- 9-20 12.77 0.750

Clear Skies, Petr [2018-09-16 13:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this Mars-crosser on 5 nights: Sep. 09, 18:36-19:54 UT; Sep. 10, 18:36-20:57 UT; Sep. 12, 18:21-19:48 UT; Sep. 13-14, 18:25-01:18 UT and Sep. 14-15, 18:22-00:13 UT.
Vladimir [2018-09-15 10:53, Sopot AO] Message sent to BinAstPhotSurvey conference

(7230) Lutz (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/07230.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-10-18 11:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed over several nights.
Vladimir [2018-10-16 14:33, Sopot AO]

(35063) 1988 FD (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/35063.png
http://www.asu.cas.cz/~asteroid/35063_nsp.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-10-15 09:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 01:20 UT. Hopefully, this will finish it.
Don [2018-10-10 00:26, Sugarloaf]

· Started a run on this at 01:50 UT.
Don [2018-10-05 02:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this on Sep 29+30 UT.
Don [2018-10-01 02:15, Sugarloaf]

(14121) Stuwe (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot, supported with two partial nights by Marek Husarik from Skalnate Pleso: A good solution and coverage, some small deviations seen, but no significant second period detected.
http://www.asu.cas.cz/~asteroid/14121.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-10-10 12:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 02:00 UT. With Marek's run, this should cover many hours.
Don [2018-09-19 00:44, Sugarloaf]

· Starting this at 19 UT.
Marek [2018-09-18 19:50, SkalnatePleso] [Remove]
Message sent to observers

· Vladimir Benishek observed this new target from Sopot on three nights. Formally, the best fit is obtained for a period of 11.68 h, but it would be an unusual lightcurve with 5 (?) pairs of maxima and minima per period. Or it may be a shorter period with a second component present.
http://www.asu.cas.cz/~asteroid/14121.png
More data from stations spread in longitude are needed. Errors < 0.02 mag and long sessions are strongly preferred.

Clear Skies, Petr [2018-09-14 06:37, Ondrejov] Message sent to BinAstPhotSurvey conference

(88954) 2001 TE42 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/88954.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-10-08 12:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:40 UT.
Don [2018-10-06 00:42, Sugarloaf]

· Started this one at 00:45 UT.
Don [2018-10-05 02:02, Sugarloaf]

· Did runs on this on Sep 29+30 UT.
Don [2018-10-01 02:20, Sugarloaf] Message sent to BinAstPhotSurvey conference

(67856) 2000 WL15 (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and by Vladimir Benishek from Sopot: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/67856.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-10-08 07:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:40 UT.
Don [2018-10-06 00:44, Sugarloaf]

· Started a run on this at 00:45 UT.
Don [2018-10-05 02:01, Sugarloaf]

· Observed on Oct 3-4 (17:46-03:22 UT).
Vladimir [2018-10-05 01:53, Sopot AO] Message sent to observers

· Observed this one on Sep 29+30 UT.
Don [2018-10-01 02:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5402) Kejosmith (Finished) - binary [Add new note]
· Our binary discovery announcement on this one has appeared on CBET 4561, copied below for your convenience.

Cheers, Petr

(5402) KEJOSMITH
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H Kucakova,
and K. Hornoch, Ondrejov Observatory; B. Warner, Center for Solar System
Studies (Palmer Divide Station), Eaton, CO, U.S.A.; J. Oey, Blue Mountains
Observatory, Leura, NSW, Australia; F. Pilcher, Organ Mesa Observatory, Las
Cruces, NM, U.S.A.; and V. Chiorny, Kharkiv Observatory, report that
photometric observations obtained with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.65-m telescope at Ondrejov Observatory, 0.35-m
and 0.30-m telescopes at the Center for Solar System Studies, a 0.61-m
telescope at the Blue Mountains Observatory, a 0.35-m telescope at the Organ
Mesa Observatory, and a 0.70-m telescope at the Chuguev station of the
Kharkiv Observatory in Ukraine during Aug. 4-Sept. 17 reveal that minor
planet (5402) is a binary system with an orbital period of 16.31 or 32.62 hr.
The primary shows a period of 2.69549 Â± 0.00009 hr and has a light-curve
amplitude of 0.13 mag at solar phases 19-24 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.03- to
0.07-magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.18.

2018 October 7 (CBET 4561) Daniel W. E. Green [2018-10-08 06:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our complete data for this new binary:
http://www.asu.cas.cz/~asteroid/05402_2018a_porb.png
http://www.asu.cas.cz/~asteroid/05402_2018a_p1.png
http://www.asu.cas.cz/~asteroid/05402_2018b_porb.png
http://www.asu.cas.cz/~asteroid/05402_2018b_p1.png
Unfortunately the data doesn't reveal it clearly whether it is P_orb of 16.31 h or twice that; high-quality data with errors < 0.01 mag covering phases around 0.75 for the 16.31-h period would be needed to reveal whether it is a shallow secondary event there. Nevermind, we are going to publish this one on a CBET.

Petr [2018-10-02 04:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data observed on 09/16 [2018-09-17 20:31, Blue Mountains Obs] Message sent to observers

· observed on 09/19,09/11,09/13,09/14. Not sure if the event was captured. Many data points need to be removed due to faint back ground stars. [2018-09-15 22:16, Blue Mountains Obs]

· Vladimir Benishek and a few others have observed this off-list target over the past four weeks, found it to be a binary.
http://www.asu.cas.cz/~asteroid/05402_2018a_porb.png
http://www.asu.cas.cz/~asteroid/05402_2018a_p1.png
There remains an ambiguity whether it is P_orb of 16.3 or 32.6 h. Covering the shallow secondary event (around orbital phase 0.75) for the shorter period with high-quality observations (errors <= 0.01 mag) is needed. We encourage others here to help out (but don't bother in less ideal conditions). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9- 2 16.48 0.255
2018- 9- 3 8.78 0.255
2018- 9- 4 1.08 0.255
2018- 9- 4 17.38 0.255
2018- 9- 5 9.68 0.255
2018- 9- 6 1.98 0.255
2018- 9- 6 18.28 0.255
2018- 9- 7 10.58 0.255
2018- 9- 8 2.88 0.255
2018- 9- 8 19.18 0.255
2018- 9- 9 11.48 0.255
2018- 9-10 3.78 0.255
2018- 9-10 20.08 0.255
2018- 9-11 12.38 0.255
2018- 9-12 4.68 0.255
2018- 9-12 20.98 0.255
2018- 9-13 13.28 0.255
2018- 9-14 5.58 0.255
2018- 9-14 21.88 0.255
2018- 9-15 14.18 0.255
2018- 9-16 6.48 0.255
2018- 9-16 22.78 0.255
2018- 9-17 15.08 0.255
2018- 9-18 7.38 0.255
2018- 9-18 23.68 0.255
2018- 9-19 15.98 0.255
2018- 9-20 8.28 0.255
2018- 9-21 0.58 0.255
2018- 9-21 16.88 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9- 3 0.54 0.750
2018- 9- 3 16.84 0.750
2018- 9- 4 9.14 0.750
2018- 9- 5 1.44 0.750
2018- 9- 5 17.74 0.750
2018- 9- 6 10.04 0.750
2018- 9- 7 2.34 0.750
2018- 9- 7 18.64 0.750
2018- 9- 8 10.94 0.750
2018- 9- 9 3.24 0.750
2018- 9- 9 19.54 0.750
2018- 9-10 11.84 0.750
2018- 9-11 4.14 0.750
2018- 9-11 20.44 0.750
2018- 9-12 12.74 0.750
2018- 9-13 5.04 0.750
2018- 9-13 21.34 0.750
2018- 9-14 13.64 0.750
2018- 9-15 5.94 0.750
2018- 9-15 22.24 0.750
2018- 9-16 14.54 0.750
2018- 9-17 6.84 0.750
2018- 9-17 23.14 0.750
2018- 9-18 15.44 0.750
2018- 9-19 7.74 0.750
2018- 9-20 0.04 0.750
2018- 9-20 16.34 0.750
2018- 9-21 8.64 0.750

Clear Skies, Petr [2018-09-02 07:07, Ondrejov] Message sent to BinAstPhotSurvey conference

(15107) Toepperwein (Finished) - Paired Asteroid [Add new note]
· Closed for now. Petr [2018-10-05 10:30, Ondrejov]

· Starting a run at 1:15 UT.
Don [2018-09-06 01:11, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I Plan to start this at 01:15 UT.
Don [2018-09-05 00:44, Sugarloaf]

· Starting this at 02:45 UT.
Don [2018-08-16 01:42, Sugarloaf]

· I plan to start this at 03:15 UT.
Don [2018-08-10 01:18, Sugarloaf] Message sent to observers

· I did a run on this on Aug 6, UT.
Don [2018-08-06 18:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

(6556) Arcimboldo (Finished) [Add new note]
· Julian Oey observed this return "prime suspect" from Leura: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06556_b8.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-10-01 11:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed the returning "prime suspect" on the 09/19,09/20,09/21 [2018-09-28 20:28, Blue Mountains Obs]

· Vladimir Benishek has observed this "prime suspect" from Sopot on four nights from Nov. 5 to 9: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06556_b5.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Petr [2015-11-09 12:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this target on two nights: Nov. 5 (01:03-04:05 UT) and Nov. 05-06 (20:04-04:05 UT).
Vladimir [2015-11-06 12:18, Sopot AO]

(14510) 1996 ES2 (Finished) [Add new note]
· This new target was observed by Vladimir Benishek from Sopot and by Don Pray from Sugarloaf Mountain: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/14510.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2018-10-01 11:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this on Sep 29 and 30.

Don [2018-10-01 02:13, Sugarloaf]

· Observed on Sep. 20-21, 21:00-02:27 UT; Sep. 21-22, 19:48-03:10 UT and Sep. 29-30, 21:09-01:29 UT.
Vladimir [2018-09-30 20:09, Sopot AO] Message sent to BinAstPhotSurvey conference

(10123) Fideoja (Finished) [Add new note]
· observed on 09/12,09/16,09/19,09/20,09/21 and 09/22. [2018-09-29 09:29, Blue Mountains Obs] Message sent to observers

· Starting on this returning binary [2018-09-17 13:12, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· A solution for this one remains unclear - is it a binary?
http://www.asu.cas.cz/~asteroid/010123.png
High quality data in the future will show.

Petr [2010-04-22 12:34, Ondrejov]

· Started a run at about 01:00 UT.
Don [2010-04-14 03:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 00:55 UT.
Don [2010-04-13 01:50, CarbuncleHill]

· Started a run at about 01:00 UT, and will take linking images for all my sessions on this.
Don [2010-04-12 02:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from ~19:45 UT. Jozef [2010-03-23 20:32, Modra]

· Observing from 22h UT. Jozef [2010-03-22 22:12, Modra]

· Observing again tonight since 0100 UT with Prompt after being GRB'ed shortly into the run last night. Excellent conditions. Joe. [2010-03-21 03:13, Dark Sky & PROMPT] Message sent to observers

· Four nights by Don from Carbuncle Hill show an interesting lightcurve for this paired asteroid. A tentative solution (maybe completely wrong):
http://www.asu.cas.cz/~asteroid/010123.png
More observations by a few stations from different continents (on both hemispheres, if possible) are needed to get an understading of this case. Long or linked sessions are needed, with errors about 0.05 mag or better.

Clear Skies, Petr [2010-03-18 09:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 03:20UT.
Don [2010-03-10 03:40, CarbuncleHill]

· I've done two nights on this so far, and started a third at 04:15 UT.
Don [2010-03-09 04:34, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(6554) Takatsuguyoshida (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot on five nights:
http://www.asu.cas.cz/~asteroid/06554.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-18 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

(20470) 1999 NZ5 (Finished) [Add new note]
· Julian Oey observed this return "prime suspect" from Leura: Good solution and coverage, no significant deviation. Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-18 08:08, Ondrejov]

· additional observation on 09/16 [2018-09-17 12:58, Blue Mountains Obs] Message sent to observers

· Start observing this prime suspect over 3 nights 09/11,09/13,09/14 . Primary period is 3.6649h [2018-09-16 01:04, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Well done all:
http://www.asu.cas.cz/~asteroid/20470.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-07-08 11:09, Ondrejov]

· Starting this object at 22:50 UT. Gabo [2014-07-07 22:56, SkalnatePleso] [Remove]
Message sent to observers

· This target was observed from Ondrejov, Sugarloaf, Prompt, SRO and by ASH2 telescope. Period is unique, double coverage and no significant deviations. Target is done (no additional observations are needed) and will be finished (closed) soon.

http://www.asu.cas.cz/~asteroid/20470.png

Peter K. [2014-07-03 09:02, Ondrejov] Message sent to observers

· I plan to start this at 4:00 UT. Conditions will likely degrade later on.
Don [2014-07-01 02:38, Sugarloaf]

· Got a short run of usable data between stars last night. Will run again tonight starting around 6hUT. -Walt [2014-07-01 00:22, Sonoita] Message sent to observers

· Observing under variable conditions tonight. Peter K. [2014-06-30 23:26, Ondrejov]

· I did a run on this last night and got a few good images before field stars interfered.

I'll be starting a run tonight at 04:00 UT.
Don [2014-06-30 02:47, Sugarloaf] Message sent to observers

· Our run from SRO last night aborted after two hours and a couple of field stars left us without any useful photometry. Will try again tonight. -Walt [2014-06-29 20:01, Sonoita]

· This night a short time observing from 23:20 UT. Gabo [2014-06-28 22:38, SkalnatePleso] [Remove]
Message sent to observers

· Will run from SRO tonight starting around 6h UT. -Walt [2014-06-28 18:32, Sonoita]

· And more help. I'm planning to start a run at 04:10 UT.
Don [2014-06-28 01:47, Sugarloaf] Message sent to observers

· Help may be on the way. Began observing from Perth at 1540 UT under good conditions. Hope to continue to 2200 UT. Joe [2014-06-27 16:04, Dark Sky & PROMPT]

· Peter Kusnirak has taken the first data for this new target, indicating a period around 4 hours:
http://www.asu.cas.cz/~asteroid/20470.png

As it is not sure if he will be able to take more data soon (and our nightly window is short for obtaining a good coverage now anyway), we would like to ask for a help to establish the period and obtaining double coverage.

Clear Skies, Petr [2014-06-27 08:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target and observed it for 2.5 hours tonight. Peter K. [2014-06-27 00:23, Ondrejov]

(7334) Sciurus (Finished) [Add new note]
· Julian Oey observed this return "prime suspect" from Leura on five nights: Good coverage, no significant deviation. Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-17 12:31, Ondrejov]

· additional observation on 09/12 [2018-09-16 21:23, Blue Mountains Obs] Message sent to observers

· observed on 08/17,08/29,09/10,09/11 [2018-09-16 12:46, Blue Mountains Obs]

· Started observing tonight [2018-08-14 12:23, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Joe has done this target with PROMPT on three nights: Unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/07334.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, Joe.

Cheers, Petr [2011-12-22 09:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt at 0050 UT under good conditions. Joe [2011-12-22 03:50, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt at 0045 UT under good conditions. Joe [2011-12-21 00:47, Dark Sky & PROMPT]

· Observed from Prompt 12/19-20/11 from 0100-0600 UT. Period is a little over 4 hours with an amplitude of about 0.3 magnitudes. Will try to observe for next few nights. Joe [2011-12-20 16:48, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(38163) 1999 JP77 (Finished) [Add new note]
· Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-17 12:05, Ondrejov]

· observed on 09/5,09/07,09/11, 09/12 [2018-09-16 08:51, Blue Mountains Obs] Message sent to observers

· Observed last night again (Aug. 12-13, 19:53-01:17 UT).
Vladimir [2018-08-13 11:49, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed again on Aug. 11-12, 21:04-02:02 UT.
Vladimir [2018-08-12 12:30, Sopot AO]

· Observed on Aug. 9-10 (20:13-01:14 UT) and Aug. 10-11 (20:02-02:01 UT).
Vladimir [2018-08-11 13:14, Sopot AO] Message sent to BinAstPhotSurvey conference

· I observed this new target on Aug. 5-6 (21:02-01:26 UT).
Vladimir [2018-08-08 14:01, Sopot AO]

(27133) 1998 XQ9 (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and Vladimir Benishek from Sopot: Unique solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/27133.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-17 09:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this new target on Sep 2 UT. Looks like a fast rotator.

Don [2018-09-02 16:24, Sugarloaf]

(25015) 1998 QN2 (Finished) - binary [Add new note]
· Our binary discovery announcement on this one has appeared on CBET 4553, copied below for your convenience. More data (with errors not greater than 0.03 mag) would be useful for future modeling; event ephemeris is further below.

(25015) 1998 QN2
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia; R.
Groom, Darling Range Observatory, Perth, Western Australia; D. Pray, Sugarloaf
Mountain Observatory, South Deerfield, MA, U.S.A.; and V. Chiorny, Kharkiv
Observatory, report that photometric observations obtained with a 0.35-m
telescope at the Sopot Observatory in Serbia, a 0.61-m telescope at the Blue
Mountains Observatory, a 0.30-m telescope at the Darling Range Observatory, a
0.50-m telescope at the Sugarloaf Mountain Observatory, and a 0.70-m telescope
at the Chuguev station of the Kharkiv Observatory in Ukraine during Aug. 13-
Sept. 9 reveal that minor planet (25015) is a binary system with an orbital
period of 43.98 Â± 0.03 hr. The primary shows a period of 4.4011 Â± 0.0003
hr and has a lightcurve amplitude of 0.27 mag at solar phases 7-14 degrees.
Mutual eclipse/occultation events that are 0.14- to 0.26-magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.41.

2018 September 14 (CBET 4553) Daniel W. E. Green

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-17 13.80 0.241
2018- 9-19 9.78 0.241
2018- 9-28 13.68 0.241
2018- 9-30 9.66 0.241
2018-10- 2 5.64 0.241
2018-10- 4 1.62 0.241
2018-10- 5 21.60 0.241
2018-10- 7 17.58 0.241
2018-10- 9 13.56 0.241
2018-10-11 9.54 0.241
2018-10-13 5.52 0.241
2018-10-15 1.50 0.241
2018-10-16 21.48 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2018- 9-16 16.82 0.764
2018- 9-18 12.80 0.764
2018- 9-29 12.68 0.764
2018-10- 1 8.66 0.764
2018-10- 3 4.64 0.764
2018-10- 5 0.62 0.764
2018-10- 6 20.60 0.764
2018-10- 8 16.58 0.764
2018-10-10 12.56 0.764
2018-10-12 8.54 0.764
2018-10-14 4.52 0.764
2018-10-16 0.50 0.764

Clear Skies, Petr [2018-09-16 11:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this new binary:
http://www.asu.cas.cz/~asteroid/25015_2018a_porb.png
http://www.asu.cas.cz/~asteroid/25015_2018a_p1.png
http://www.asu.cas.cz/~asteroid/25015_2018b_porb.png
http://www.asu.cas.cz/~asteroid/25015_2018b_p1.png
Doing an announcement for CBET.

Cheers, Petr [2018-09-10 07:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing secondary event from 19:00 UT. Vasilij Ch. [2018-09-03 22:04, Kharkiv] Message sent to observers

· observed on 16,17 and 20th August that happened to be in a non-event duration. [2018-08-22 13:39, Blue Mountains Obs]

· More data by Vladimir Benishek and Don Pray give an apparently unique P_orb:
http://www.asu.cas.cz/~asteroid/25015_porb.png
http://www.asu.cas.cz/~asteroid/25015_p1.png

One more coverage for each of the two events is needed, to nail down the solution, before we publish this one on CBET. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 8-22 22.17 0.241
2018- 8-30 6.25 0.241
2018- 9- 1 2.27 0.241
2018- 9- 2 22.29 0.241
2018- 9- 4 18.31 0.241
2018- 9- 6 14.33 0.241
2018- 9- 8 10.35 0.241
2018- 9-10 6.37 0.241
2018- 9-12 2.39 0.241
2018- 9-13 22.41 0.241
2018- 9-15 18.43 0.241
2018- 9-17 14.45 0.241
2018- 9-19 10.47 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2018- 8-23 21.31 0.766
2018- 8-31 5.39 0.766
2018- 9- 2 1.41 0.766
2018- 9- 3 21.43 0.766
2018- 9- 5 17.45 0.766
2018- 9- 7 13.47 0.766
2018- 9- 9 9.49 0.766
2018- 9-11 5.51 0.766
2018- 9-13 1.53 0.766
2018- 9-14 21.55 0.766
2018- 9-16 17.57 0.766
2018- 9-18 13.59 0.766

Clear Skies, Petr [2018-08-22 12:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed by Vladimir Benishek from Sopot, supported by Don Pray from Sugarloaf Mountain, on 7+2 nights. Captured one deep and two possible shallow attenuations. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/25015_p1.png
http://www.asu.cas.cz/~asteroid/25015_porb.png
(The period in the second plot was set just for plotting purpose; P_orb has not been estimated yet.)

More observations are needed to catch more events, to confirm it.

Clear Skies, Petr [2018-08-21 09:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Aug. 16-17, 20:28-02:02 UT and Aug. 17-18, 20:08-01:56 UT.
Vladimir [2018-08-18 15:13, Sopot AO]

· Observed on Aug. 15-16, 20:13-01:04 UT.
Vladimir [2018-08-16 12:20, Sopot AO] Message sent to observers

· Planning to observe this starting at 02:45 UT if the weather holds.
Don [2018-08-16 01:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed on Aug. 13-14, 20:19-01:01 UT.
Vladimir [2018-08-14 12:01, Sopot AO]

· This new target was observed last night (Aug. 12-13, 20:24-01:25 UT).
Vladimir [2018-08-13 11:52, Sopot AO] Message sent to BinAstPhotSurvey conference

(3146) Dato (Finished) [Add new note]
· Vladimir Benishek observed this return "prime suspect" from Sopot on 4 nights: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03146_b8.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-12 08:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one was completed with additional observations by Don Pray from Sugarloaf Mountain and by Joe Pollock with PROMPT: Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/03146_b4.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-07-24 06:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 03:40.
Don [2014-07-22 02:42, Sugarloaf] Message sent to observers

· Just began this one from Prompt Tololo. Hope to follow it to about 0530 UT. Joe [2014-07-20 00:59, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

· This new target has been worked by Peter Kusnirak and Kamil Hornoch from here and by Don Pray from Sugarloaf Mountain. It's a unique period now, and one more night is needed to complete its double coverage. As we will not be able to take the additional night soon (there is another program running at the 0.65-m here for the next three nights), we ask someone here to help out.
http://www.asu.cas.cz/~asteroid/03146_b4.png

Clear Skies, Petr [2014-07-19 06:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to observe this one tonight from 21 UT. Best wishes, Kamil [2014-07-18 20:36, Ondrejov] Message sent to observers

· Observing from 22:15 UT tonight. Peter [2014-07-17 22:22, Ondrejov]

· starting this object (J.Toth, AGO MODRA)
early end, clouds [2014-07-12 00:22, Modra] Message sent to observers

· Starting this new target at 4:30 UT.
Don [2014-07-01 02:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Unsuccessfull observations. [2010-06-24 12:09, Ondrejov]

· Started this new target at about 03:00UT.
Don [2010-06-09 03:30, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(1151) Ithaka (Finished) [Add new note]
· Julian Oey observed this return "prime suspect" from Leura. A group of 4 points at the end of his 3rd night is decreased by 0.09 mag, while Julian sees no observational problem there. This possible binary will have to be confirmed in future.
http://www.asu.cas.cz/~asteroid/01151_b8.png
Target closed for this year.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-11 10:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· starting a new target [2018-05-19 10:48, Blue Mountains Obs]

(6456) Golombek (Finished) [Add new note]
· This return "prime suspect" was observed by Romain Montaigut and Arnaud Leroy from OPERA, by Bruno Christmann, and by Vasilij Chiorny from Kharkiv: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/06456_b8.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys!

Petr [2018-09-07 10:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have observed this target on 3 nights from OPERA plus 2 nights by another observer from France.
The estimated period is 2.5016h with an amplitude of 0.106mag : no deviation.
Romain [2018-09-06 20:13, OPERA] Message sent to observers

· I observed this one from 18:45 UT.
Vasilij Ch. [2018-09-04 23:46, Kharkiv]

· I observed this target on two nights. Found a period of 2.504h and an amplitude of 0.11 mag. I planned to observe it again in a few nights.

Romain [2018-08-27 18:19, OPERA] Message sent to BinAstPhotSurvey conference

(3956) Caspar (Finished) [Add new note]
· Don Pray did this "prime suspect" from Sugarloaf Mountain on three nights in its current 2nd apparition: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/03956_b8.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-06 10:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this new target last night, Sep. 2 UT. Appears to be a fast rotator.

Don [2018-09-02 16:26, Sugarloaf]

· Done by Marek, Zuzana and Michal from S. Pleso, by Vasilij from Kharkiv, and by Leos from Modra: unique period, good coverage, no significant deviation (one session from Kharkiv appeared noisy and it was not included into solution),
http://www.asu.cas.cz/~asteroid/03956.png
Finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2008-11-12 08:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 17:00 UT in good conditions. Michal [2008-11-03 17:16, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 01:05 UT in good conditions. Michal [2008-11-02 01:56, SkalnatePleso] [Remove]

· Observed 30.102008 19:55-22:45 UT. Leos [2008-10-31 09:57, Modra] Message sent to observers

· Three nights by Vasilij Chiorny from Kharkiv and two nights by Marek and Zuzana from S. Pleso have revealed an apparently unique period of 2.7708 h, but there are seen some anomalous deviations in Vasilij's data,
http://www.asu.cas.cz/~asteroid/03956.png
We are clouded out here during these days, so I encourage others to help out.

Clear Skies, Petr [2008-10-29 13:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started about 19 UT. If weather permits we do it full night.
Marek & Zuzana [2008-10-26 19:21, SkalnatePleso] [Remove]
Message sent to observers

· We started to observe this new object on Oct 25 19:35 UT. After last night it shows 2.79 hr period with 0.13 mag amplitude.
http://www.ta3.sk/~mhusarik/3956/
Marek & Zuzana [2008-10-26 06:47, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(68513) 2001 UL167 (Finished) [Add new note]
· This target didn't get a full double coverage so it was not done enough for the BinAstPhotSurvey. Closing it.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2018-09-03 10:12, Ondrejov]

· I started this new target on July 19. Looks like a high-amplitude object.
Don [2018-07-19 17:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

(19633) Rusjan (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain, by Vasilij Chiorny from Kharkiv, and by Vladimir Benishek from Sopot: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/19633.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-09-03 07:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 18:30 UT. Vasilij Ch. [2018-08-17 18:47, Kharkiv] Message sent to observers

· I observed this one on night 15/16 Aug trom 22:15 UT to 01:15 UT and I started on this night from 21:00 UT.
Vasilij Ch. [2018-08-16 21:15, Kharkiv]

· I'll be starting this new target at 02:20 UT.
Don [2018-08-10 01:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2119) Schwall (Finished) [Add new note]
· Vladimir Benishek observed this new target from Sopot: Good solution, acceptable coverage, no deviation.
http://www.asu.cas.cz/~asteroid/02119.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-08-31 12:34, Ondrejov] Message sent to BinAstPhotSurvey conference

(11650) 1997 CN (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain on six nights, supported with one night by Vladimir Benishek from Sopot: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/11650.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-08-31 07:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've done two sessions on this. The period could be in the 9-hour range.
Don [2018-08-09 15:10, Sugarloaf]

(3677) Magnusson (Finished) [Add new note]
· This new target was observed by Hana Kucakova and Kamil Hornoch from here and by Vasilij Chiorny from Kharkiv: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03677.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2018-08-02 11:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this target two nights on 7/8 and 8/9 July 2018.
Vasilij Ch. [2018-07-09 11:17, Kharkiv]

(66432) 1999 NL46 (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain, by Hana Kucakova, Kamil Hornoch, Petr Fatka and Peter Kusnirak from here, and by Vladimir Benishek from Sopot: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/66432.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-07-30 10:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on July 20-21 (20:10-01:38 UT).
Vladimir [2018-07-21 11:48, Sopot AO] Message sent to observers

· Did a run on July 7, UT.
Don [2018-07-07 20:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

(11272) 1998 RK (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain and by Hana Kucakova, Kamil Hornoch and Peter Kusnirak from here: Unique period, good coverage, no prominent deviation.
http://www.asu.cas.cz/~asteroid/11272.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-07-25 12:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've done several runs on this, and it's looking like a period of 8.1 hr.
Don [2018-07-13 00:11, Sugarloaf]

· Did a run on this new target on July 5.
Dob [2018-07-05 23:55, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5069) Tokeidai (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/05069.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2018-07-25 10:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this on July 12 and plan another run on July 13.
Don [2018-07-13 00:13, Sugarloaf]

(28959) 2001 DL74 (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain, by Julian Oey from Leura, by Vladimir Benishek from Sopot and by Peter Kusnirak from here. Thanks to the collaboration from the three continents, its period of 23.99 h is uniquely resolved (U = 3).
http://www.asu.cas.cz/~asteroid/28959.png
Object closed for the Survey.

Good work guys.

Petr [2018-07-25 10:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I just started observation of this target and expecting full-night session. Peter K. [2018-07-14 20:35, Ondrejov] Message sent to observers

· Starting a run on this at 01:55 UT. Looks like a slow rotator.
Don [2018-06-16 00:20, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3690) Larson (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain and Vladimir Benishek from Sopot: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03690.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2018-07-23 13:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on July 20-21 (21:46-01:36 UT).
Vladimir [2018-07-21 11:46, Sopot AO] Message sent to observers

· I did a run on this on July 12 UT.
Don [2018-07-12 22:19, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this new target on two nights: July 05-06 (22:39-01:22 UT) and July 10-11 (22:15-00:53 UT).
Vladimir [2018-07-12 15:19, Sopot AO]

(4666) Dietz (Finished) - binary [Add new note]
· Our announcement on this one has appeared on CBET 4536, copied below for your convenience.

Cheers, Petr

(4666) DIETZ
J. Oey, Blue Mountains Observatory, Leura, NSW, Australia; P. Kusnirak,
P. Pravec, and K. Hornoch, Ondrejov Observatory; D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A.; V. Benishek, Belgrade Astronomical
Observatory; R. Montaigut and A. Leroy, OPERA Observatory, France; and J.
Vilagi, Modra Observatory, report that photometric observations obtained with
0.35-m and 0.61-m telescopes at the Blue Mountains Observatory, a 0.31-m
telescope at the JBL Observatory in Bathurst, NSW, Australia, a 0.35-m
telescope at Perth Observatory; a 0.65-m telescope at Ondrejov Observatory,
a 0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.35-m telescope
at the Sopot Observatory in Serbia, a 0.20-m telescope at the OPERA
Observatory, and a 0.61-m telescope at the Modra Observatory during 2011
May 25-June 1, 2015 Sept. 2-Oct. 18, and 2018 Mar. 31-July 6 reveal that
minor planet (4666) is a binary system with an orbital period of 33.2 Â±
0.1 hr. The primary shows a period of 2.9524 Â± 0.0001 hr and has a
lightcurve amplitude of 0.28 mag at solar phases 9-19 deg. Mutual
eclipse/occultation events that are up to 0.12 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.34. There
occurred three additional 0.18-, 0.25-, and 0.09-magnitude-deep attenuations
on 2015 Sept. 2 and on 2018 Apr. 7 and 8 that were not aligned with the
33.2-hr orbital period, suggesting the presence of a third body in the system.
The mean absolute magnitude of the whole system in the Cousins R photometric
system is H_R = 12.67 Â± 0.09, assuming the phase relation slope parameter
G = 0.24 Â± 0.11.

2018 July 20 (CBET 4536) Daniel W. E. Green [2018-07-20 19:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· More observations on 06/13, 06/14, 06/15 [2018-06-20 20:34, Blue Mountains Obs] Message sent to observers

· Continuing data gathering on 05/23, 05/24, 05/31, 06/01, 06/03, 06/07, 06/11, 06/12 [2018-06-13 02:46, Blue Mountains Obs]

· Observed 5/29, 5/31, 6/01, 6/02, 6/03, 6/04, 6/05. [2018-06-05 13:29, Santana] Message sent to observers

· further observations on 05/20, 05/21 and 05/22, I have captured a few events that has narrowed down the Porb to 33h. At Dec -14, it may pose quite a challenge for those in the northern hemisphere but please try to work on it if possible with the usual required criteria. Peter will post the ephemeris and more info for next lunation in due course. thks [2018-05-22 23:03, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed on 05/14,05/15,05/17,05/19 [2018-05-20 09:50, Blue Mountains Obs] Message sent to observers

· additional observations done on 05/04, 05/05, 05/06, 05/07, 05/08, 05/09 [2018-05-12 07:50, Blue Mountains Obs]

· more observations was done on 04/07,04/08,04/11,04/12 [2018-04-24 13:35, Blue Mountains Obs] Message sent to observers

· Start a new asteroid from Perth Observatory. [2018-04-02 10:01, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· The probable binary nature (two periods significant, one prominent event captured) of this one has been revealed from extensive observations by Don Pray from Sugarloaf Mountain, supported by a few nights by Vladimir Benishek from Sopot, by Romain Montaigut and Arnaud Leroy from OPERA, and by Jan Vrastil and Kamil Hornoch from here:
http://www.asu.cas.cz/~asteroid/04666_2015_p1.png
http://www.asu.cas.cz/~asteroid/04666_2015_p2.png
http://www.asu.cas.cz/~asteroid/04666_2015_p2_nsp.png

With only one event captured, the orbital period is likely quite long, but parameters of the binary cannot be much constrained. Target closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great effort folks.

Petr [2015-10-26 12:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:00 UT.
Don [2015-10-17 01:23, Sugarloaf] Message sent to observers

· Doing a run on this tonight.
Don [2015-10-15 02:26, Sugarloaf]

· Started a run on this at 00:10 UT.
Don [2015-10-11 00:56, Sugarloaf]

· I started this at 01:40 UT.
Don [2015-09-21 01:45, Sugarloaf] Message sent to observers

· Started this at 00:30 UT.
Don [2015-09-17 01:27, Sugarloaf]

· Started this at 00:55 UT.
Don [2015-09-15 01:16, Sugarloaf]

· Observed on Sep. 12-13, 18:32 - 03:07 UT.
Vladimir [2015-09-13 13:37, Sopot AO] Message sent to observers

· Started this at 00:20 UT.
Don [2015-09-12 00:30, Sugarloaf]

· Observed last night, Sep. 8-9, 18:23 - 02:50 UT.
Vladimir [2015-09-09 11:21, Sopot AO]

· I observed this one last night Sep. 07-08 (18:44 - 02:29 UT).
Vladimir [2015-09-08 10:53, Sopot AO] Message sent to observers

· Started a run at 00:30 UT.
Don [2015-09-06 00:39, Sugarloaf]

· I started a run on this at 00:30 UT.
Don [2015-09-05 00:33, Sugarloaf]

· We observed this one from Ondrejov and Modra in 2011, found it to be a "prime suspect", but didn't capture any events:
http://www.asu.cas.cz/~asteroid/04666.png

Don Pray has taken first data for it in its current return apparition. There appears to be an attenuation, suspect mutual event:
http://www.asu.cas.cz/~asteroid/04666_2015_porb.png
http://www.asu.cas.cz/~asteroid/04666_2015_p1.png
The observations were taken with the bright moon not very far away so a confirmation is needed. Don will observe it as much as his weather allows, but a help from other stations will be appreciated.

Clear Skies, Petr [2015-09-03 14:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:00 UT.
Don [2015-09-03 00:58, Sugarloaf] Message sent to observers

· Started this one last night.
Don [2015-09-02 18:56, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This new target has been done by Peter K. from here and by Jozef V. and Peter V. from Modra: unique solution, sufficient coverage, no deviation:
http://www.asu.cas.cz/~asteroid/04666.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2011-06-01 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:55UT in variable conditions. Jozef, Peter. [2011-05-31 20:54, Modra] Message sent to observers

· Observed from 20:50 UT to 01:15 UT on May 29/30. Peter K. [2011-05-30 02:03, Ondrejov]

· Observing from 21:45 UT but seeing is very poor tonight. Peter K. [2011-05-24 23:14, Ondrejov] Message sent to BinAstPhotSurvey conference

(9957) Raffaelosanti (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on 4 good nights: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/09957.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work Don.

Petr [2018-07-12 12:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Took a session on this new target on July 5.
Don [2018-07-05 23:57, Sugarloaf]

(7715) Leonidarosino (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 6 short nights: A good solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07715.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-07-11 13:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:50 UT.
Don [2018-07-07 01:50, Sugarloaf]

· Started a run on this at 01:55 UT.
Don [2018-07-05 01:52, Sugarloaf]

· I started this on June 16 and observed again on July 3.
Don [2018-07-04 00:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

(6809) Sakuma (Finished) - binary suspect, to be confirmed in the future [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 6 nights. Detected a period of 2.5749 h, but there are suspect features on the first two nights that might be events in a binary system. A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/06809.png
http://www.asu.cas.cz/~asteroid/06809_suspectevents.png
(Note: The period in the second plot was set just for plotting purpose; no P_orb was actually estimated.)

This binary suspect will have to be confirmed in the future. Closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-06-29 11:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:35 UT.
Don [2018-04-14 00:32, Sugarloaf]

· Started this one on Mar 23 UT.
Don [2018-03-24 00:01, Sugarloaf]

(31450) 1999 CU9 (Finished) [Add new note]
· It's insufficient data for the (relatively long) orbital period coverage. Target closed for this apparition. Petr [2018-06-28 13:17, Ondrejov]

· observed on 04/07 [2018-04-08 08:27, Blue Mountains Obs] Message sent to observers

· Start a new target 04/05 [2018-04-05 20:34, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Discovery apparition is over. Petr [2015-11-19 14:58, Ondrejov]

· Our binary discovery report on this one has appeared on CBET 4157, attached below for your convenience.

Cheers, Petr

(31450) 1999 CU9
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, K. Hornoch, J. Vrastil and H. Kucakova, Ondrejov Observatory;
V. Benishek, Belgrade Astronomical Observatory, Serbia; R. Roy, Observatoire
de Blauvac, France; R. Behrend, Geneva Observatory; D. Romeuf,
Chapdes-Beaufort, France; B. Warner, Center for Solar System Studies, Eaton,
CO, U.S.A.; A. Scholz and G. Hodosan, Observatory of the University of St.
Andrews, U.K.; J. Pollock, Appalachian State University; R. Montaigut and A.
Leroy, OPERA Observatory, France; and D. Reichart and J. Haislip, University
of North Carolina, Chapel Hill, report that photometric observations obtained
during Sept. 5-Oct. 13 reveal that minor planet (31450) is a binary system
with an orbital period of 53.47 Â± 0.07 hr. The primary shows a period of
3.4116 Â± 0.0003 hr, and has a lightcurve amplitude of 0.24 mag at solar
phases 5-9 deg. Mutual secondary eclipse/occultation events that are 0.05
magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.22.

2015 October 26 (CBET 4157) Daniel W. E. Green [2015-10-26 07:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· We are going to submit a discovery announcement on this one to CBET soon (after all co-authors check/complete circulated draft). The data we have:
http://www.asu.cas.cz/~asteroid/31450_201509a_p1.png
http://www.asu.cas.cz/~asteroid/31450_201509a_porb.png
http://www.asu.cas.cz/~asteroid/31450_201509b_porb.png
http://www.asu.cas.cz/~asteroid/31450_201510a_porb.png
http://www.asu.cas.cz/~asteroid/31450_201510b_porb.png

Monitoring evolution of the events in the next lunation would be useful (errors not greater than 0.02 mag are needed). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-11- 1 3.62 0.245
2015-11- 3 9.09 0.245
2015-11- 5 14.56 0.245
2015-11- 7 20.03 0.245
2015-11-10 1.50 0.245
2015-11-12 6.97 0.245
2015-11-14 12.44 0.245
2015-11-16 17.91 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-31 0.60 0.740
2015-11- 2 6.07 0.740
2015-11- 4 11.54 0.740
2015-11- 6 17.01 0.740
2015-11- 8 22.48 0.740
2015-11-11 3.95 0.740
2015-11-13 9.42 0.740
2015-11-15 14.89 0.740
2015-11-17 20.36 0.740

Clear Skies, Petr [2015-10-22 08:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one to catch half of the secondary event at the end of the run.
Don [2015-10-13 01:18, Sugarloaf] Message sent to observers

· Started this at 00:25 UT. Hope to catch the primary event at 02.13 UT.
Don [2015-10-11 23:33, Sugarloaf]

· Observed on Oct. 01-02, 22:02 - 00:10 UT.
Vladimir [2015-10-03 15:35, Sopot AO]

· This one is almost nailed down:
http://www.asu.cas.cz/~asteroid/31450_201509_porb.png
http://www.asu.cas.cz/~asteroid/31450_201509a_p1.png
http://www.asu.cas.cz/~asteroid/31450_201509b_p1.png

A couple more sessions for the events would be good before we announce it on CBET. Good data only (covering the events well and with errors < 0.02 mag) are going to be useful; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10- 3 4.33 0.245
2015-10- 5 9.78 0.245
2015-10- 7 15.23 0.245
2015-10- 9 20.68 0.245
2015-10-12 2.13 0.245
2015-10-14 7.58 0.245
2015-10-16 13.03 0.245
2015-10-18 18.48 0.245
2015-10-20 23.93 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2015-10- 2 1.73 0.748
2015-10- 4 7.18 0.748
2015-10- 6 12.63 0.748
2015-10- 8 18.08 0.748
2015-10-10 23.53 0.748
2015-10-13 4.98 0.748
2015-10-15 10.43 0.748
2015-10-17 15.88 0.748
2015-10-19 21.33 0.748

Clear Skies, Petr [2015-09-29 13:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been observed by Don Pray from Sugarloaf Mountain, by Jan Vrastil, Hana Kucakova and Kamil Hornoch from here, and by Vladimir Benishek from Sopot. Fractions of four events were captured. Their period appears to be ~53.6 hours,
http://www.asu.cas.cz/~asteroid/31450_porb.png
http://www.asu.cas.cz/~asteroid/31450_p1.png

More data are needed to nail down the solution; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 9-22 1.40 0.240
2015- 9-24 7.00 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2015- 9-23 5.06 0.756

Clear Skies, Petr [2015-09-21 11:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Sep. 18-19, 18:02 - 0:56 UT.
Vladimir [2015-09-19 14:02, Sopot AO] Message sent to observers

· I observed this target on Sep. 17-18, 20:01 - 0:56 UT.
Vladimir [2015-09-18 18:52, Sopot AO]

· Good run on this one from Perth from about 1200 to 1800 UT. Joe [2015-09-17 19:12, Dark Sky & PROMPT] Message sent to observers

· For this one, Don Pray has taken six good runs from Sugarloaf Mountain, supported with one long run by Jan Vrastil and Kamil Hornoch from here. There are two suspect attenuations in Don's data, see
http://www.asu.cas.cz/~asteroid/31450_porb.png
http://www.asu.cas.cz/~asteroid/31450_p1.png
(The period in the first plot above is arbitrary; no solution for P_orb has been obtained.)

More data are needed to confirm; I encourage others here to help out.

Clear Skies, Petr [2015-09-16 13:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 01:00 UT.
Don [2015-09-15 01:17, Sugarloaf] Message sent to observers

· I plan to start this one at 01:15.
Don [2015-09-12 00:35, Sugarloaf]

· I'll be starting a run on this at 02:00 UT.
Don [2015-09-03 01:00, Sugarloaf]

· Joe Pollock has taken 6.2 hours worth of data with Prompt for this new target:
http://www.asu.cas.cz/~asteroid/31450.png
He'll not be able to take more data soon probably, so it would be good if someone could take over the target. A couple nights might do it.

Clear Skies, Petr [2015-08-23 12:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from Prompt Tololo on 57253 (Aug 18-19) from 0400-1010 UT. Period is about 3.45 hours and amplitude is 0.25 magnitudes. Joe [2015-08-20 18:08, Dark Sky & PROMPT] Message sent to observers

· Plan to start this new target at 03:50 UT.
Don [2015-08-14 02:39, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2859) Paganini (Finished) - slow rotator [Add new note]
· Closing this slow rotator.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-06-26 10:54, Ondrejov]

· observed on 04/30,05/15,05/16, 05/23,05/24,05/25,05/27,05/28,05/29
last 4 nights linked with same comp. stars [2017-06-09 22:30, Blue Mountains Obs] Message sent to observers

· observed in April 4,5,8,14,24,29 and 03/27. long period of 38.14h found [2017-05-15 13:51, Blue Mountains Obs]

· observed in April 4,5,8,14,24,29 and 03/27. long period of 38.14h found [2017-05-15 11:15, Blue Mountains Obs] Message sent to observers

· started a new target from 04/04 and 04/05 [2017-04-08 22:11, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(14120) Espenak (Finished) [Add new note]
· Insufficient data for this one. [2018-06-26 10:36, Ondrejov]

· Observed on 12/18, 12/20, 12/30, 01/06, 01/04
Period of 7.2412 h found and Amp. Of 0.79mag [2018-01-12 11:50, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(29168) 1990 KJ (Finished) [Add new note]
· The data are inconclusive re. satellite presence. Closed for this apparition.

Petr [2018-06-26 09:36, Ondrejov]

· Observed on June 07-08 (20:30 - 00:21 UT).
Vladimir [2018-06-08 12:38, Sopot AO] Message sent to observers

· New data on this one obtained last night (June 05-06, 21:05 - 00:37 UT).
Vladimir [2018-06-06 14:21, Sopot AO]

· Data sent to Petr and Peter. [2018-05-26 16:11, Santana] Message sent to observers

· Observed on May 20-21, 19:39 - 01:31 UT.
Vladimir [2018-05-21 11:37, Sopot AO]

· I observed this one on 10/11 May from 21:00 UT to 00:20 UT.
Vasilij Ch. [2018-05-11 10:21, Kharkiv] Message sent to observers

· Started observations of this returning binary candidate as a 'Full Moon' project. Despite lower SNR than normally desired, there appears to be evidence of attenuation events. [2018-05-04 16:14, Santana] Message sent to BinAstPhotSurvey conference

· Twelve absolutely calibrated nights by Kamil Hornoch and Peter Kusnirak from here, plus 10 additional relative nights (two by Kamil and Peter and 8 by Vasilij Chiorny and Vasilij Shevchenko from Kharkiv) revealed that this one is a probably binary, showing two additive rotational lightcurve components:
http://www.asu.cas.cz/~asteroid/29168_p1.png
http://www.asu.cas.cz/~asteroid/29168_p2.png
While P_1 was estimate securely (U = 3), a small uncertainty remains with the P_2 estimate (U = 2). Two suspect brightness drops were seen in Ondrejov observations on 2011-05-29.9 and 06-04.0, but they were not confirmed on other nights (though all other nights covering the same P_2 phases occured earlier in May, so the appearance of the attenuations since May 29.9 might be due to an evolution of the system's viewing geometry). This probable binary will have to be confirmed with future observations.

Closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on this demanding case.

Petr [2011-09-05 12:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 21:12 UT. After rain, during shortest night under passing clouds, may be a waste of time, again :-).
Stefan [2011-06-21 22:47, Modra]

· Observing it from 20:46 UT.
Stefan [2011-06-19 21:19, Modra] Message sent to BinAstPhotSurvey conference

· Observing tonight. Jozef, Stefan. [2011-06-16 21:06, Modra]

· This one awaits completing linkages before we close it. Petr [2011-06-13 13:23, Ondrejov]

· Observing this target tonight from 20:00 Vasilij Ch. [2011-06-08 20:24, Kharkiv] Message sent to observers

· Observing this object from 19:25 U.T. tonight under good conditions. Vasilij Ch. [2011-06-07 20:24, Kharkiv]

· Observing from 19:10 U.T. tonight. Vasilij Ch. [2011-06-06 19:46, Kharkiv] Message sent to observers

· Observing this one from 19:00 U.T. Best wishes. Vasilij Ch. 2011-06-01 19:50, Kharkiv [2011-06-01 19:50, Kharkiv]

· I will be observing this one tonight from 21:30 to 01:10 UT. Best wishes, Kamil [2011-05-30 14:43, Ondrejov] Message sent to observers

· Kamil and Peter K. observed this new target extensively here on 11 nights, supported with two nights by Vasilij Chiorny from Kharkiv. The (partially linked) data show that there are two periods, and Peter has captured a drop that looks like a mutual event with depth of 0.11 mag on the last night, see:
http://www.asu.cas.cz/~asteroid/29168_p1.png
http://www.asu.cas.cz/~asteroid/29168_p2.png
The second period is somewhat tentative yet and we need to capture more events to establish the solution. I encourage you to help out to confirm this serious binary suspect.

Clear Skies, Petr [2011-05-30 14:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 20:45 UT to 0:05 UT on May 29/30. Peter K. [2011-05-30 02:04, Ondrejov] Message sent to observers

· Observing this one from 20:35 UT. Best wishes, Kamil [2011-05-28 20:48, Ondrejov]

· We will start this one + (9556) Gaywray as supplementary target at 20:30 UT. Best wishes, Kamil + student [2011-05-23 18:55, Ondrejov] Message sent to observers

· Observing from 20:10 UT in moderate conditons. [2011-05-06 22:10, Ondrejov]

· Observing this one from 20:10 UT. Best wishes, Kamil [2011-05-03 20:27, Ondrejov] Message sent to observers

· I will start this one tonight if weather permit. Best wishes, Kamil [2011-05-01 19:41, Ondrejov] Message sent to BinAstPhotSurvey conference

(25328) 1999 JK83 (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and by Hana Kucakova, Peter Kusnirak and Kamil Hornoch from here: An U = 2 solution, no significant deviation apparent.
http://www.asu.cas.cz/~asteroid/25328_b8.png
http://www.asu.cas.cz/~asteroid/25328_nsp.png
Object closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort guys on the low-amplitude target.

Petr [2018-06-26 09:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 01:55 UT.
Don [2018-06-16 00:15, Sugarloaf] Message sent to observers

· Started this at 01:45 UT.
Don [2018-06-08 01:44, Sugarloaf]

· Observed for almost 4 hours last night. It was 3rd night in row from here. Peter K. [2018-06-05 08:02, Ondrejov] Message sent to observers

· I've taken 4 sessions so far on this off-list target, between May 19-25 UT.
Don [2018-05-25 16:28, Sugarloaf] Message sent to BinAstPhotSurvey conference

(10108) Tomlinson (Finished) - serious binary candidate [Add new note]
· This is a serious binary candidate,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Closed for this apparition.
Petr [2018-06-13 10:30, Ondrejov]

· I started a run on this at 01:50 UT.
Don [2018-06-08 01:47, Sugarloaf] Message sent to observers

· Started a run at 01:20 UT.
Don [2018-05-24 01:24, Sugarloaf]

· Observed again last night (May 20, 19:36 - 23:26 UT).
Vladimir [2018-05-21 11:30, Sopot AO] Message sent to observers

· Observed on May 12 19:22-21:26 UT, May 17 19:24-22:22 UT and May 19 19:11-23:35 UT.
Vladimir [2018-05-20 13:37, Sopot AO]

· Observed last night (May 11-12, 20:00-00:04 UT).
Vladimir [2018-05-12 12:44, Sopot AO] Message sent to observers

· I started this at 02:10 UT, and should catch the event at 5.66 UT.
Don [2018-05-10 02:11, Sugarloaf]

· Observing this one from 19:58 UT planing full-night run. Best wishes, Kamil [2018-05-09 19:58, Ondrejov] Message sent to observers

· Observed on May 8, 19:14-23:50 UT.
Vladimir [2018-05-09 12:30, Sopot AO]

· Observing this one from 19:45 UT planing full-night run. Best wishes, Kamil [2018-05-05 20:14, Ondrejov] Message sent to observers

· This one was observed by Vladimir Benishek from Sopot and by Petr Fatka and Kamil Hornoch from here on the past night. Updated lc decomposition for the likely P_orb:
http://www.asu.cas.cz/~asteroid/10108_porb.png
http://www.asu.cas.cz/~asteroid/10108_p1.png

The other possible orbital period, 40.9 h, needs to be checked with more observations after the full moon. Below is an updated event ephemeris for the 20.45-h period; if it is the 40.9-h orbital period, only the 0.25-phase events will occur. Errors <= 0.02 mag are needed; don't bother in less ideal conditions.

Date/Time UTC (LTc.) Phase
--------------------------
2018- 5- 3 10.06 0.251
2018- 5- 4 6.51 0.251
2018- 5- 5 2.96 0.251
2018- 5- 5 23.41 0.251
2018- 5- 6 19.86 0.251
2018- 5- 7 16.31 0.251
2018- 5- 8 12.76 0.251
2018- 5- 9 9.21 0.251
2018- 5-10 5.66 0.251
2018- 5-11 2.11 0.251
2018- 5-11 22.56 0.251
2018- 5-12 19.01 0.251
2018- 5-13 15.46 0.251
2018- 5-14 11.91 0.251
2018- 5-15 8.36 0.251
2018- 5-16 4.81 0.251
2018- 5-17 1.26 0.251
2018- 5-17 21.71 0.251
2018- 5-18 18.16 0.251
2018- 5-19 14.61 0.251
2018- 5-20 11.06 0.251
2018- 5-21 7.51 0.251
2018- 5-22 3.96 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2018- 5- 3 20.27 0.751
2018- 5- 4 16.72 0.751
2018- 5- 5 13.17 0.751
2018- 5- 6 9.62 0.751
2018- 5- 7 6.07 0.751
2018- 5- 8 2.52 0.751
2018- 5- 8 22.97 0.751
2018- 5- 9 19.42 0.751
2018- 5-10 15.87 0.751
2018- 5-11 12.32 0.751
2018- 5-12 8.77 0.751
2018- 5-13 5.22 0.751
2018- 5-14 1.67 0.751
2018- 5-14 22.12 0.751
2018- 5-15 18.57 0.751
2018- 5-16 15.02 0.751
2018- 5-17 11.47 0.751
2018- 5-18 7.92 0.751
2018- 5-19 4.37 0.751
2018- 5-20 0.82 0.751
2018- 5-20 21.27 0.751
2018- 5-21 17.72 0.751

Clear Skies, Petr [2018-04-25 13:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has captured another one :-)
His two nights for this new target give following likely solution:
http://www.asu.cas.cz/~asteroid/10108_porb.png
http://www.asu.cas.cz/~asteroid/10108_p1.png
In particular, the orbital period is either 20.25 h or (less likely) twice that. The event ephemeris below is for the shorter period; for the longer period, only the 0.247-phase events will occur. I think that Don may be able to nail down it even himself alone, but a help by others would be also welcome. Errors <= 0.02 mag are needed; don't bother in less ideal conditions.

Date/Time UTC (LTc.) Phase
--------------------------
2018- 4-24 21.03 0.247
2018- 5- 3 7.53 0.247
2018- 5- 4 3.78 0.247
2018- 5- 5 0.03 0.247
2018- 5- 5 20.28 0.247
2018- 5- 6 16.53 0.247
2018- 5- 7 12.78 0.247
2018- 5- 8 9.03 0.247
2018- 5- 9 5.28 0.247
2018- 5-10 1.53 0.247
2018- 5-10 21.78 0.247
2018- 5-11 18.03 0.247
2018- 5-12 14.28 0.247
2018- 5-13 10.53 0.247
2018- 5-14 6.78 0.247
2018- 5-15 3.03 0.247
2018- 5-15 23.28 0.247
2018- 5-16 19.53 0.247
2018- 5-17 15.78 0.247
2018- 5-18 12.03 0.247
2018- 5-19 8.28 0.247
2018- 5-20 4.53 0.247
2018- 5-21 0.78 0.247
2018- 5-21 21.03 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2018- 4-25 7.14 0.747
2018- 5- 3 17.64 0.747
2018- 5- 4 13.89 0.747
2018- 5- 5 10.14 0.747
2018- 5- 6 6.39 0.747
2018- 5- 7 2.64 0.747
2018- 5- 7 22.89 0.747
2018- 5- 8 19.14 0.747
2018- 5- 9 15.39 0.747
2018- 5-10 11.64 0.747
2018- 5-11 7.89 0.747
2018- 5-12 4.14 0.747
2018- 5-13 0.39 0.747
2018- 5-13 20.64 0.747
2018- 5-14 16.89 0.747
2018- 5-15 13.14 0.747
2018- 5-16 9.39 0.747
2018- 5-17 5.64 0.747
2018- 5-18 1.89 0.747
2018- 5-18 22.14 0.747
2018- 5-19 18.39 0.747
2018- 5-20 14.64 0.747
2018- 5-21 10.89 0.747
2018- 5-22 7.14 0.747

Clear Skies, Petr [2018-04-24 06:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing this Apr 14 and doing a run tonight.
Don [2018-04-22 01:24, Sugarloaf]

(17700) 1997 GM40 (Finished) - return binary [Add new note]
· Our report on this one has appeared on CBET 4517, copied here for your convenience.

Cheers, Petr

(17700) 1953 XU_1 = 1997 GM_40 = 1999 VD_53
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, H. Kucakova, K. Hornoch, and P. Kusnirak, Ondrejov Observatory;
J. Oey, Blue Mountains Observatory, Leura, NSW, Australia; V. Benishek,
Belgrade Astronomical Observatory; A. Aznar, Astronomia Para Todos
Observatories Group, "European Near Earth Asteroids Research (EURONEAR)",
Spain; and A. L. Comazzi, Instituto de Astrofisica de Andalucia, CSIC,
Spain, report that photometric observations obtained with a 0.50-m
telescope at the Sugarloaf Mountain Observatory, a 0.65-m telescope at the
Ondrejov Observatory, a 0.61-m, a 0.35-m and a 0.31-m telescopes at the
Blue Mountains Observatory, a 0.35-m telescope at the Sopot Observatory in
Serbia, and a 0.90-m telescope at Sierra Nevada Observatory during
Mar. 20-May 10 reveal that minor planet (17700) is a binary system with an
orbital period of 15.49 Â± 0.02 hr. The primary shows a period of 3.8382
Â± 0.0002 hr and has a lightcurve amplitude of 0.13 mag at solar phases
8-15 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are up to 0.20-magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.31.
There occurred two additional 0.14- to 0.18-magnitude-deep attenuations on
Mar. 20 and 25 that were not aligned with the 15.49-hr orbital period,
suggesting presence of a third body in the system. The mean absolute
magnitude of the whole system in the Cousins R photometric system is H_R =
13.98 Â± 0.05 with the phase relation slope parameter G = 0.35 Â± 0.05.

2018 May 26 (CBET 4517) Daniel W. E. Green [2018-05-27 06:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new binary is interesting. Events detected since April 9 line up with a period of 15.49 h, but they didn't occur (prominently) before that date ---so it appears that we moved into the eclipse/occultation geometry on or shortly before April 9---, but there were one fully and one partially covered events on March 20 and 25; they may belong to a third body (second satellite) in the system. Lc decompositions:
http://www.asu.cas.cz/~asteroid/17700_2018a_porb.png
http://www.asu.cas.cz/~asteroid/17700_2018a_p1.png
http://www.asu.cas.cz/~asteroid/17700_2018b_porb.png
http://www.asu.cas.cz/~asteroid/17700_2018b_p1.png
http://www.asu.cas.cz/~asteroid/17700_2018c_porb.png
http://www.asu.cas.cz/~asteroid/17700_2018c_p1.png

We are drafting an announcement for CBET.

Cheers, Petr [2018-05-24 11:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 02:10 UT.
Don [2018-05-10 02:11, Sugarloaf] Message sent to observers

· Started this at 01:00 UT.
Don [2018-04-22 01:20, Sugarloaf]

· Observed on April 20, 18:28-23:56 UT.
Vladimir [2018-04-21 17:59, Sopot AO]

· Worked last night from OSN T90 from 21:00 UT to 00:00 and from 01:20 until the end of the night. [2018-04-18 08:04, IAO-Isaac Aznar Obs.] Message sent to observers

· Observed on Apr. 13-14, 18:44-0:48 UT.
Vladimir [2018-04-14 12:32, Sopot AO]

· observed on 04/11 and 04/12 [2018-04-14 11:33, Blue Mountains Obs]

· Observed last night (Apr 13/14) for about 3 hours. Peter K. [2018-04-14 05:40, Ondrejov] Message sent to observers

· Started this one at 00:35 UT.
Don [2018-04-14 00:32, Sugarloaf]

· Observed last night (Apr. 11-12, 19:09-01:04 UT).
Vladimir [2018-04-12 11:37, Sopot AO] Message sent to observers

· Started a run at 00:40 UT.
Don [2018-04-11 00:46, Sugarloaf]

· I started this at 00:50 UT.
Don [2018-04-09 01:02, Sugarloaf]

· Started this one at 00:30 UT.
Don [2018-04-06 00:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

· More data taken by Don Pray from Sugarloaf Mountain, by Vladimir Benishek from Sopot, and by Hana Kucakova and Kamil Hornoch from here. Vladimir has captured a part of another event. There are several possible values for the orbital period, a lc decomposition for one of them:
http://www.asu.cas.cz/~asteroid/17700_2018a_porb.png
http://www.asu.cas.cz/~asteroid/17700_2018a_p1.png

More observations with errors < 0.03 mag are needed to nail it down.

Clear Skies, Petr [2018-03-27 07:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· I got my first data on this one (Mar. 24-25, 22:13-02:44 UT).
Vladimir [2018-03-25 09:36, Sopot AO] Message sent to observers

· I started a run on this at 01:55 UT.
Don [2018-03-23 02:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray has taken first data for this new target, found it to be a possible binary. A tentative decomposition:
http://www.asu.cas.cz/~asteroid/17700_2018a_porb.png
http://www.asu.cas.cz/~asteroid/17700_2018a_p1.png

More data are needed to confirm it. Don's weather is variable these days, a help by others here would be appreciated. Data with errors < 0.03 mag are needed and long sessions are prefered.

Clear Skies, Petr [2018-03-21 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this new target on Mar 20 UT.
Don [2018-03-21 00:23, Sugarloaf]

(42946) 1999 TU95 (Finished) - paired asteroid [Add new note]
· Done for this apparition. [2018-05-26 13:24, Ondrejov]

· Planning to start this one at 01:20 UT.
Don [2018-04-11 00:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for this apparition. [2014-05-12 13:38, Ondrejov]

· Observing from 21:35 UT. Peter K. [2014-04-22 22:15, Ondrejov]

· Done for the NEOSource project. Petr [2012-12-21 11:15, Ondrejov]

· Started this at 00:40 UT.
Don [2012-12-14 00:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 00:45 UT.
Don [2012-12-13 02:29, Sugarloaf]

· Started this new target at about 01:00 UT.
Don [2012-12-12 01:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2815) Soma (Finished) - returning binary [Add new note]
· Done in the 4th apparition. Petr [2018-05-26 13:08, Ondrejov]

· Observing from 20:45 UT under average conditions. Peter K. [2018-05-04 22:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done for the 3rd apparition. Petr [2014-04-11 07:19, Ondrejov]

· Observed on 2014-04-03 from 18 UT to 22.8 UT. Vasilij Ch. [2014-04-05 18:58, Kharkiv] Message sent to observers

· Observing this night since 18:30 UT. Good condition. Gabo [2014-03-29 18:14, SkalnatePleso] [Remove]

· I observed this one from 19:00 UT to 24:10 UT under good condition. Vasilij Ch. [2014-03-27 00:41, Kharkiv] Message sent to observers

· Began run from Prompt Tololo at 0000 UT. Hope to get 0.753 phase event centered at 0213 UT. Joe [2014-03-22 00:50, Dark Sky & PROMPT]

· Have been running since 0230 UT from Prompt Tololo under good skies. Currently in the middle of the 0.753 event centered at 0354 UT. Can run until about 0720 UT. Joe [2014-03-07 03:54, Dark Sky & PROMPT] Message sent to observers

· Just began run from Prompt Tololo. Hope to get most of 0.753 event centered at 0416 UT. Joe [2014-03-04 01:01, Dark Sky & PROMPT]

· About to begin run from Prompt Tololo. Hope to get most of 0.253 event centered at 0122 UT. Joe [2014-03-02 23:56, Dark Sky & PROMPT] Message sent to observers

· Jan Vrastil and Kamil Hornoch have taken the first night for this return binary in its current 3rd apparition:
http://www.asu.cas.cz/~asteroid/02815_14_porb.png
http://www.asu.cas.cz/~asteroid/02815_14_p1.png

As usual, covering each of the two events twice per lunation will be ideal for our future modeling; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 3- 1 13.54 0.253
2014- 3- 2 7.45 0.253
2014- 3- 3 1.37 0.253
2014- 3- 3 19.28 0.253
2014- 3- 4 13.20 0.253
2014- 3- 5 7.12 0.253
2014- 3- 6 1.03 0.253
2014- 3- 6 18.95 0.253
2014- 3- 7 12.86 0.253
2014- 3- 8 6.78 0.253
2014- 3- 9 0.70 0.253
2014- 3- 9 18.61 0.253
2014- 3-10 12.53 0.253
2014- 3-11 6.44 0.253
2014- 3-12 0.36 0.253
2014- 3-20 5.44 0.253
2014- 3-20 23.35 0.253
2014- 3-21 17.27 0.253
2014- 3-22 11.18 0.253
2014- 3-23 5.10 0.253
2014- 3-23 23.02 0.253
2014- 3-24 16.93 0.253
2014- 3-25 10.85 0.253
2014- 3-26 4.76 0.253
2014- 3-26 22.68 0.253
2014- 3-27 16.60 0.253
2014- 3-28 10.51 0.253
2014- 3-29 4.43 0.253
2014- 3-29 22.34 0.253
2014- 3-30 16.26 0.253
2014- 3-31 10.18 0.253
2014- 4- 1 4.09 0.253
2014- 4- 1 22.01 0.253
2014- 4- 2 15.92 0.253
2014- 4- 3 9.84 0.253
2014- 4- 4 3.76 0.253
2014- 4- 4 21.67 0.253
2014- 4- 5 15.59 0.253
2014- 4- 6 9.50 0.253
2014- 4- 7 3.42 0.253
2014- 4- 7 21.34 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2014- 3- 1 22.48 0.753
2014- 3- 2 16.40 0.753
2014- 3- 3 10.32 0.753
2014- 3- 4 4.23 0.753
2014- 3- 4 22.15 0.753
2014- 3- 5 16.06 0.753
2014- 3- 6 9.98 0.753
2014- 3- 7 3.90 0.753
2014- 3- 7 21.81 0.753
2014- 3- 8 15.73 0.753
2014- 3- 9 9.64 0.753
2014- 3-10 3.56 0.753
2014- 3-10 21.48 0.753
2014- 3-11 15.39 0.753
2014- 3-20 14.38 0.753
2014- 3-21 8.30 0.753
2014- 3-22 2.22 0.753
2014- 3-22 20.13 0.753
2014- 3-23 14.05 0.753
2014- 3-24 7.96 0.753
2014- 3-25 1.88 0.753
2014- 3-25 19.80 0.753
2014- 3-26 13.71 0.753
2014- 3-27 7.63 0.753
2014- 3-28 1.54 0.753
2014- 3-28 19.46 0.753
2014- 3-29 13.38 0.753
2014- 3-30 7.29 0.753
2014- 3-31 1.21 0.753
2014- 3-31 19.12 0.753
2014- 4- 1 13.04 0.753
2014- 4- 2 6.96 0.753
2014- 4- 3 0.87 0.753
2014- 4- 3 18.79 0.753
2014- 4- 4 12.70 0.753
2014- 4- 5 6.62 0.753
2014- 4- 6 0.54 0.753
2014- 4- 6 18.45 0.753
2014- 4- 7 12.37 0.753

Clear Skies, Petr [2014-03-01 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· The 2nd apparition is finished, observations in the 3rd one will be needed for modeling. Petr [2012-11-26 11:32, Ondrejov]

· Began run from Prompt under good conditions at 0055 UT. Hope to cover secondary centered at 0239 UT. Joe [2012-11-14 01:50, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt under good conditions at 0020 UT to obtain outside events light curve. Joe [2012-11-13 00:59, Dark Sky & PROMPT]

· Began run from Prompt under good conditions at 0030 UT. Hope to cover secondary centered at 0300 UT. Joe [2012-11-11 00:57, Dark Sky & PROMPT] Message sent to observers

· Joe Pollock took four nights of great data with Prompt in October:
http://www.asu.cas.cz/~asteroid/02815_12c_porb.png
http://www.asu.cas.cz/~asteroid/02815_12c_p1.png

Monitoring the events evolution in November will be useful. (They will be the last data for this apparition.) Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 12.93 0.261
2012-11- 3 6.85 0.261
2012-11- 4 0.76 0.261
2012-11- 4 18.68 0.261
2012-11- 5 12.59 0.261
2012-11- 6 6.51 0.261
2012-11- 7 0.43 0.261
2012-11- 7 18.34 0.261
2012-11- 8 12.26 0.261
2012-11- 9 6.17 0.261
2012-11-10 0.09 0.261
2012-11-10 18.01 0.261
2012-11-11 11.92 0.261
2012-11-12 5.84 0.261
2012-11-12 23.75 0.261
2012-11-13 17.67 0.261
2012-11-14 11.59 0.261
2012-11-15 5.50 0.261
2012-11-15 23.42 0.261
2012-11-16 17.33 0.261
2012-11-17 11.25 0.261
2012-11-18 5.17 0.261
2012-11-18 23.08 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 4.00 0.762
2012-11- 2 21.91 0.762
2012-11- 3 15.83 0.762
2012-11- 4 9.75 0.762
2012-11- 5 3.66 0.762
2012-11- 5 21.58 0.762
2012-11- 6 15.49 0.762
2012-11- 7 9.41 0.762
2012-11- 8 3.33 0.762
2012-11- 8 21.24 0.762
2012-11- 9 15.16 0.762
2012-11-10 9.07 0.762
2012-11-11 2.99 0.762
2012-11-11 20.91 0.762
2012-11-12 14.82 0.762
2012-11-13 8.74 0.762
2012-11-14 2.65 0.762
2012-11-14 20.57 0.762
2012-11-15 14.49 0.762
2012-11-16 8.40 0.762
2012-11-17 2.32 0.762
2012-11-17 20.23 0.762
2012-11-18 14.15 0.762
2012-11-19 8.07 0.762

Clear Skies, Petr [2012-10-31 10:17, Ondrejov]

· Began run from Prompt at 0050 UT under excellent conditions. Have covered primary centered at 0218 UT. Joe [2012-10-20 03:21, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt under good conditions at 0300 UT. Hope to cover secondary centered at 0554 UT. Joe [2012-10-15 03:13, Dark Sky & PROMPT]

· Began run from Prompt under good conditions at 0000 UT. Hope to cover secondary centered at 0618 UT. Joe [2012-10-12 06:18, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt at 0000 UT. Hope to cover primary centered at 0318 UT. Joe [2012-10-11 00:03, Dark Sky & PROMPT]

· This return binary (2nd apparition) has been worked by Joe Pollock with Prompt, by Julian Oey from Leura and by Vasilij Chiorny from Kharkiv in this month; our solution:
http://www.asu.cas.cz/~asteroid/02815_12b_porb.png
http://www.asu.cas.cz/~asteroid/02815_12b_p1.png
http://www.asu.cas.cz/~asteroid/02815_12a_porb.png
http://www.asu.cas.cz/~asteroid/02815_12a_p1.png

Monitoring the events evolution in October will be useful for future modeling. Errors <0.02 mag are needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 3 16.15 0.253
2012-10- 4 10.07 0.253
2012-10- 5 3.98 0.253
2012-10- 5 21.90 0.253
2012-10- 6 15.81 0.253
2012-10- 7 9.73 0.253
2012-10- 8 3.65 0.253
2012-10- 8 21.56 0.253
2012-10- 9 15.48 0.253
2012-10-10 9.39 0.253
2012-10-11 3.31 0.253
2012-10-11 21.23 0.253
2012-10-12 15.14 0.253
2012-10-13 9.06 0.253
2012-10-14 2.97 0.253
2012-10-14 20.89 0.253
2012-10-15 14.81 0.253
2012-10-16 8.72 0.253
2012-10-17 2.64 0.253
2012-10-17 20.55 0.253
2012-10-18 14.47 0.253
2012-10-19 8.39 0.253
2012-10-20 2.30 0.253
2012-10-20 20.22 0.253
2012-10-21 14.13 0.253
2012-10-22 8.05 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 3 7.27 0.758
2012-10- 4 1.19 0.758
2012-10- 4 19.10 0.758
2012-10- 5 13.02 0.758
2012-10- 6 6.93 0.758
2012-10- 7 0.85 0.758
2012-10- 7 18.77 0.758
2012-10- 8 12.68 0.758
2012-10- 9 6.60 0.758
2012-10-10 0.51 0.758
2012-10-10 18.43 0.758
2012-10-11 12.35 0.758
2012-10-12 6.26 0.758
2012-10-13 0.18 0.758
2012-10-13 18.09 0.758
2012-10-14 12.01 0.758
2012-10-15 5.93 0.758
2012-10-15 23.84 0.758
2012-10-16 17.76 0.758
2012-10-17 11.67 0.758
2012-10-18 5.59 0.758
2012-10-18 23.51 0.758
2012-10-19 17.42 0.758
2012-10-20 11.34 0.758
2012-10-21 5.25 0.758
2012-10-21 23.17 0.758
2012-10-22 17.09 0.758

Clear Skies, Petr [2012-09-24 09:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt at 0100 UT under good conditions. Hope to cover secondary centered at 0220 UT. Joe [2012-09-22 02:31, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt at 0400 UT. Hope to cover primary centered at 0555 UT. Joe [2012-09-17 04:14, Dark Sky & PROMPT]

· Began run from Prompt at 0000 UT. Hope to cover secondary centered at 0300 UT. Joe [2012-09-16 00:13, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt at 0130 UT. Hope to cover primary centered at 0615 UT. Joe [2012-09-14 01:28, Dark Sky & PROMPT]

· Observed this object from 19:40 U.T. to 23:00 U.T. in relatively good conditions. Vasilij Ch. [2012-09-13 22:35, Kharkiv] Message sent to observers

· First data for this return binary in its current 2nd (first return) apparition were taken by Julian Oey from Leura, by Joe Pollock with Prompt, and by Vasilij Chiorny from Kharkiv:
http://www.asu.cas.cz/~asteroid/02815_12_porb.png
http://www.asu.cas.cz/~asteroid/02815_12_p1.png

More data will be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 9- 3 19.46 0.248
2012- 9- 4 13.37 0.248
2012- 9- 5 7.28 0.248
2012- 9- 6 1.20 0.248
2012- 9- 6 19.11 0.248
2012- 9- 7 13.03 0.248
2012- 9- 8 6.94 0.248
2012- 9- 9 0.85 0.248
2012- 9- 9 18.77 0.248
2012- 9-10 12.68 0.248
2012- 9-11 6.60 0.248
2012- 9-12 0.51 0.248
2012- 9-12 18.42 0.248
2012- 9-13 12.34 0.248
2012- 9-14 6.25 0.248
2012- 9-15 0.17 0.248
2012- 9-15 18.08 0.248
2012- 9-16 11.99 0.248
2012- 9-17 5.91 0.248
2012- 9-17 23.82 0.248
2012- 9-18 17.74 0.248
2012- 9-19 11.65 0.248
2012- 9-20 5.56 0.248
2012- 9-20 23.48 0.248
2012- 9-21 17.39 0.248
2012- 9-22 11.31 0.248
2012- 9-23 5.22 0.248
2012- 9-23 23.13 0.248
2012- 9-24 17.05 0.248
2012- 9-25 10.96 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2012- 9- 4 4.39 0.747
2012- 9- 4 22.31 0.747
2012- 9- 5 16.22 0.747
2012- 9- 6 10.14 0.747
2012- 9- 7 4.05 0.747
2012- 9- 7 21.96 0.747
2012- 9- 8 15.88 0.747
2012- 9- 9 9.79 0.747
2012- 9-10 3.71 0.747
2012- 9-10 21.62 0.747
2012- 9-11 15.53 0.747
2012- 9-12 9.45 0.747
2012- 9-13 3.36 0.747
2012- 9-13 21.28 0.747
2012- 9-14 15.19 0.747
2012- 9-15 9.10 0.747
2012- 9-16 3.02 0.747
2012- 9-16 20.93 0.747
2012- 9-17 14.85 0.747
2012- 9-18 8.76 0.747
2012- 9-19 2.67 0.747
2012- 9-19 20.59 0.747
2012- 9-20 14.50 0.747
2012- 9-21 8.42 0.747
2012- 9-22 2.33 0.747
2012- 9-22 20.24 0.747
2012- 9-23 14.16 0.747
2012- 9-24 8.07 0.747
2012- 9-25 1.99 0.747

Clear Skies, Petr [2012-08-28 13:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations on 08/19,20,21,25 and previously on 08/16,17,18 show center of one of the event on the 16th,19th and 25th at about 12h UT consistent with the 17.9h Porb. [2012-08-27 12:28, Blue Mountains Obs] Message sent to observers

· Started from Prompt under good conditions at 0030 UT. Hope to get event at ~0830 UT. Joe [2012-08-27 02:47, Dark Sky & PROMPT]

· Got run last night from 0100-1000 UT (JD 56165)from Prompt under good conditions. Event occurred as expected based on the observations of Vasilij on the 22nd and the known orbital period. Joe [2012-08-26 17:52, Dark Sky & PROMPT] Message sent to observers

· Oserving this object 22.08.2012 from UT 20.9 hr to 25 hr.
Found middle primary event about UT 21.3 hr on 22.08.2012.Vasilij [2012-08-23 18:45, Kharkiv]

· Start observation 10:40 UT to 18:40UT 08/18. period is 5.441+/- 0.007h. additional observations was also done on 08/17 and 08/16 [2012-08-19 07:22, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· The discovery apparition for this binary has been completed with the last four nights by Peter and Kamil from here and Jozef and Stefan from Modra. The solution, including complete calibrations of the Ondrejov data:
http://www.asu.cas.cz/~asteroid/02815_11_porb.png
http://www.asu.cas.cz/~asteroid/02815_11_p1.png

Great work all!

Cheers, Petr [2011-05-11 11:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:30 UT in relatively good conditions. Michal [2011-05-09 19:41, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 20:20UT. Jozef, Stefan. [2011-05-06 20:19, Modra]

· Observing this one from 21:10 UT in unpredictable conditions. Best wishes, Kamil [2011-04-26 21:38, Ondrejov] Message sent to observers

· Observing from 19:50 UT. Peter K. [2011-04-24 19:47, Ondrejov]

· Our announcement on this binary has appeared on CBET 2705, copied below for your convenience. Our web page updated accordingly.
Monitoring events evolution with observations with errors not greater than 0.02 mag would be useful, so I add events ephemeris further below.

(2815) SOMA
J. Pollock, Appalachian State University; P. Pravec, P. Kusnirak, and K.
Hornoch, Ondrejov Observatory; V. Chiorny, Kharkiv Observatory; S. Gajdos,
Modra Observatory; and D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A.
LaCluyze, Physics and Astronomy Department, University of North Carolina at
Chapel Hill, report that photometric observations obtained during 2011 Mar.
7 to Apr. 9 reveal that minor planet (2815) is a binary system with an
orbital period of 17.915 ± 0.002 hr. The primary shows a period of 2.73325
± 0.00007 hr and it has a lightcurve amplitude of 0.07 mag, suggesting a
nearly spheroidal shape. Mutual eclipse/occultation events that are 0.12-
and 0.07-mag deep indicate a secondary-to-primary mean-diameter ratio of 0.25
± 0.02. The mean absolute R magnitude of the system is H_R = 12.53 ±
0.02 and the phase relation slope parameter G = 0.27 ± 0.04.

F. Marchis, J. E. Enriquez, and M. Allain, Carl Sagan Center at the SETI
Institute; and J. P. Emery, University of Tennessee at Knoxville, report on
integrated spectroscopic observations of the binary system (2815) recorded
from 2011 Apr. 1.4356 to 1.4832 UT with Infrared Telescope Facility's SPEX
instrument. A solar analogue (SAO 119577) was observed before and after the
target to compute a final reflectance spectrum from 0.67 to 2.55 microns.
Following the Bus-DeMeo taxonomy, the near-infrared spectrum is typical of
Sq-type minor planets, characterized by a wide 1-micron absorption band with
evidence of an absorption feature near 1.3 microns.

2011 April 21 (CBET 2705) Daniel W. E. Green

2011- 4-24 15.35 0.250
2011- 4-25 9.27 0.250
2011- 4-26 3.18 0.250
2011- 4-26 21.10 0.250
2011- 4-27 15.01 0.250
2011- 4-28 8.93 0.250
2011- 4-29 2.84 0.250
2011- 4-29 20.76 0.250
2011- 4-30 14.67 0.250
2011- 5- 1 8.59 0.250
2011- 5- 2 2.50 0.250
2011- 5- 2 20.42 0.250
2011- 5- 3 14.33 0.250
2011- 5- 4 8.25 0.250
2011- 5- 5 2.16 0.250
2011- 5- 5 20.08 0.250
2011- 5- 6 13.99 0.250
2011- 5- 7 7.91 0.250
2011- 5- 8 1.82 0.250
2011- 5- 8 19.74 0.250
2011- 5- 9 13.65 0.250
2011- 5-10 7.57 0.250
2011- 5-11 1.48 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 4-25 0.21 0.745
2011- 4-25 18.13 0.745
2011- 4-26 12.04 0.745
2011- 4-27 5.96 0.745
2011- 4-27 23.87 0.745
2011- 4-28 17.79 0.745
2011- 4-29 11.70 0.745
2011- 4-30 5.62 0.745
2011- 4-30 23.53 0.745
2011- 5- 1 17.45 0.745
2011- 5- 2 11.36 0.745
2011- 5- 3 5.28 0.745
2011- 5- 3 23.19 0.745
2011- 5- 4 17.11 0.745
2011- 5- 5 11.02 0.745
2011- 5- 6 4.94 0.745
2011- 5- 6 22.85 0.745
2011- 5- 7 16.77 0.745
2011- 5- 8 10.68 0.745
2011- 5- 9 4.60 0.745
2011- 5- 9 22.51 0.745
2011- 5-10 16.43 0.745
2011- 5-11 10.34 0.745

Clear Skies, Petr [2011-04-24 10:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· This "prime suspect" turned to be binary has been worked well, we will do CBET announcement shortly.
http://www.asu.cas.cz/~asteroid/02815_11_porb.png
Monitoring events evolution with observations with errors not greater than 0.02 mag in the next lunation would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 4-21 15.69 0.250
2011- 4-22 9.61 0.250
2011- 4-23 3.52 0.250
2011- 4-23 21.44 0.250
2011- 4-24 15.35 0.250
2011- 4-25 9.27 0.250
2011- 4-26 3.18 0.250
2011- 4-26 21.10 0.250
2011- 4-27 15.01 0.250
2011- 4-28 8.93 0.250
2011- 4-29 2.84 0.250
2011- 4-29 20.76 0.250
2011- 4-30 14.67 0.250
2011- 5- 1 8.59 0.250
2011- 5- 2 2.50 0.250
2011- 5- 2 20.42 0.250
2011- 5- 3 14.33 0.250
2011- 5- 4 8.25 0.250
2011- 5- 5 2.16 0.250
2011- 5- 5 20.08 0.250
2011- 5- 6 13.99 0.250
2011- 5- 7 7.91 0.250
2011- 5- 8 1.82 0.250
2011- 5- 8 19.74 0.250
2011- 5- 9 13.65 0.250
2011- 5-10 7.57 0.250
2011- 5-11 1.48 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 4-22 0.55 0.745
2011- 4-22 18.47 0.745
2011- 4-23 12.38 0.745
2011- 4-24 6.30 0.745
2011- 4-25 0.21 0.745
2011- 4-25 18.13 0.745
2011- 4-26 12.04 0.745
2011- 4-27 5.96 0.745
2011- 4-27 23.87 0.745
2011- 4-28 17.79 0.745
2011- 4-29 11.70 0.745
2011- 4-30 5.62 0.745
2011- 4-30 23.53 0.745
2011- 5- 1 17.45 0.745
2011- 5- 2 11.36 0.745
2011- 5- 3 5.28 0.745
2011- 5- 3 23.19 0.745
2011- 5- 4 17.11 0.745
2011- 5- 5 11.02 0.745
2011- 5- 6 4.94 0.745
2011- 5- 6 22.85 0.745
2011- 5- 7 16.77 0.745
2011- 5- 8 10.68 0.745
2011- 5- 9 4.60 0.745
2011- 5- 9 22.51 0.745
2011- 5-10 16.43 0.745
2011- 5-11 10.34 0.745

Clear Skies, Petr [2011-04-14 14:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying to observe this one in unpredictable weather conditions... Best wishes, Kamil [2011-04-08 22:15, Ondrejov] Message sent to observers

· Observing from 19:15 UT. Peter K. [2011-04-02 19:43, Ondrejov]

· Observing from 19:40 tonight. Vasilij Ch. [2011-04-01 21:40, Kharkiv] [2011-04-01 21:52, Kharkiv] Message sent to observers

· Observing from 19:40 tonight. Peter K. [2011-03-29 22:32, Ondrejov]

· Began run from Prompt under excellent conditions at 0105 UT. Will attempt to observe 0.740 phase event at 0317 UT. Joe [2011-03-29 02:46, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt under excellent conditions at 0400 UT. Will attempt to observe until 0940 UT. Primary event at 0640 UT. Joe [2011-03-27 05:20, Dark Sky & PROMPT]

· For this new binary, we need to get one more coverage of the secondary event to nail down D_2/D_1 before we announce it on CBET.
http://www.asu.cas.cz/~asteroid/02815_11_porb.png
http://www.asu.cas.cz/~asteroid/02815_11_p1.png
Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3-22 19.15 0.250
2011- 3-23 13.07 0.250
2011- 3-24 6.99 0.250
2011- 3-25 0.91 0.250
2011- 3-25 18.83 0.250
2011- 3-26 12.75 0.250
2011- 3-27 6.67 0.250
2011- 3-28 0.59 0.250
2011- 3-28 18.51 0.250
2011- 3-29 12.43 0.250
2011- 3-30 6.35 0.250
2011- 3-31 0.27 0.250
2011- 3-31 18.19 0.250
2011- 4- 1 12.11 0.250
2011- 4- 2 6.03 0.250
2011- 4- 2 23.95 0.250
2011- 4- 3 17.87 0.250
2011- 4- 4 11.79 0.250
2011- 4- 5 5.71 0.250
2011- 4- 5 23.63 0.250
2011- 4- 6 17.55 0.250
2011- 4- 7 11.47 0.250
2011- 4- 8 5.39 0.250
2011- 4- 8 23.31 0.250
2011- 4- 9 17.23 0.250
2011- 4-10 11.15 0.250
2011- 4-11 5.07 0.250
2011- 4-11 22.99 0.250
2011- 4-12 16.91 0.250
2011- 4-13 10.83 0.250
2011- 4-14 4.75 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3-23 3.93 0.740
2011- 3-23 21.85 0.740
2011- 3-24 15.77 0.740
2011- 3-25 9.69 0.740
2011- 3-26 3.61 0.740
2011- 3-26 21.53 0.740
2011- 3-27 15.45 0.740
2011- 3-28 9.37 0.740
2011- 3-29 3.29 0.740
2011- 3-29 21.21 0.740
2011- 3-30 15.13 0.740
2011- 3-31 9.05 0.740
2011- 4- 1 2.97 0.740
2011- 4- 1 20.89 0.740
2011- 4- 2 14.81 0.740
2011- 4- 3 8.73 0.740
2011- 4- 4 2.65 0.740
2011- 4- 4 20.57 0.740
2011- 4- 5 14.49 0.740
2011- 4- 6 8.41 0.740
2011- 4- 7 2.33 0.740
2011- 4- 7 20.25 0.740
2011- 4- 8 14.17 0.740
2011- 4- 9 8.09 0.740
2011- 4-10 2.01 0.740
2011- 4-10 19.93 0.740
2011- 4-11 13.85 0.740
2011- 4-12 7.77 0.740
2011- 4-13 1.69 0.740
2011- 4-13 19.61 0.740

Clear Skies, Petr [2011-03-18 13:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· The secondary event was covered by Joe Pollock from Prompt yesterday:
http://www.asu.cas.cz/~asteroid/02815_11_porb.png
It is a total event, the size ratio is estimated to be 0.24. A second coverage of the event before the moon is in the way since March 18 would be good. We will announce it on CBET then.

Clear Skies, Petr [2011-03-15 07:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying to catch 0.745 event, starting at 21:17 UT. One ugly star lies in path, just during the event :-(

Stefan [2011-03-14 22:24, Modra]

· This "prime suspect" observed by Don Pray and Peter Kusnirak in 2009 has turned out to be binary based on recent observations by Joe Pollock with Prompt, Kamil Hornoch from here and Vasilij Chiorny from Kharkiv,
http://www.asu.cas.cz/~asteroid/02815_11_porb.png
http://www.asu.cas.cz/~asteroid/02815_11_p1.png
The orbit period appears to be unique, but we need to cover the secondary event one or two more times to establish D_2/D_1 before we announce it on CBET. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3-14 22.89 0.745
2011- 3-15 16.81 0.745
2011- 3-16 10.73 0.745
2011- 3-17 4.65 0.745
2011- 3-17 22.57 0.745

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3-14 14.03 0.250
2011- 3-15 7.95 0.250
2011- 3-16 1.87 0.250
2011- 3-16 19.79 0.250
2011- 3-17 13.71 0.250
2011- 3-18 7.63 0.250

Clear Skies, Petr [2011-03-14 10:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt under excellent conditions at 0200 UT. Will attempt to observe until 0940 UT. Joe (This is beginning to sound like a broken record ... for those of you who are old enough to know what a broken record sounds like!) :) [2011-03-14 02:33, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt under excellent conditions at 0200 UT. Will attempt to observe until 0940 UT. Joe [2011-03-13 02:41, Dark Sky & PROMPT]

· Began run from Prompt under excellent conditions at 0300 UT. Will attempt to observe until 0940 UT. Joe [2011-03-12 06:13, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt under excellent conditions at 0213 UT. Will attempt to observe until 0940 UT. Joe [2011-03-10 02:28, Dark Sky & PROMPT]

· This asteroid was worked by Don Pray from Carbuncle Hill with a support by Peter K. from here in 2009. It showed a 0.08-mag amplitude and could be fitted equally well with a period of 2.733 h as well as its multiples. See
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
http://www.asu.cas.cz/~asteroid/02815.png
http://www.asu.cas.cz/~asteroid/02815_nsp.png

It is back now and Kamil took a 3-h worth of data on March 7. It shows a higher amplitude of 0.20 mag:
http://www.asu.cas.cz/~asteroid/02815_b1.png
Given the short duration of the session, it doesn't resolve between the 2.733-h period and its multiple. As we are busy with other targets (also for other programs than just our BinAst project) currently, a help by other observers in this group with resolving the period ambiguity would be appreciated.

Clear Skies, Petr [2011-03-09 06:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this target at 01:00 UT. Best wishes, Kamil [2011-03-07 01:05, Ondrejov]

· Don has done this one with a support by Peter K. well: almost unique unique period, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/02815.png
Close for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the low-amplitude object.

Cheers, Petr [2009-11-25 12:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 01:30 UT.
Don [2009-11-23 02:15, CarbuncleHill]

· Started a run at 02:00 UT.
Don [2009-11-22 02:07, CarbuncleHill] Message sent to observers

· I started this at about 01:40 UT.
Don [2009-11-21 03:40, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting this new target at 01:40 UT.
Don [2009-11-18 02:39, CarbuncleHill]

(17738) 1998 BS15 (Finished) - possible binary, needs to be confirmed in the future [Add new note]
· There is a possible 2nd period in the lc, but solution unclear.

Petr [2018-05-26 09:37, Ondrejov]

· Observed on Dec. 07 (16:19-22:13 UT).
Vladimir [2017-12-08 12:31, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed on Dec. 06 (16:43-22:14 UT).
Vladimir [2017-12-07 14:36, Sopot AO]

· I started this one at 22:35 UT.
Don [2017-12-06 22:40, Sugarloaf] Message sent to observers

· I started a run on this on Nov 23, 23:20 UT.
Don [2017-11-23 23:36, Sugarloaf]

· Observed on Nov. 22 (16:38-23:18 UT).
Vladimir [2017-11-23 18:10, Sopot AO] Message sent to observers

· Observed last night (Nov. 20, 16:23-23:27 UT).
Vladimir [2017-11-21 20:41, Sopot AO]

· Started this one at 23:30 UT.
Don [2017-11-18 00:45, Sugarloaf]

· Observed on Oct. 25-26 (17:15-00:11 UT).
Vladimir [2017-10-26 11:57, Sopot AO] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek observed this off-list target from Sopot on three nights, found it to be a binary suspect. My tentative decomposition of his data:
http://www.asu.cas.cz/~asteroid/17738_2017a_p1.png
http://www.asu.cas.cz/~asteroid/17738_2017a_p2.png
While P_1 seems to be reasonably established, P_2 is not unique at all. (And it would be also nice to capture events, if they occur.) I encourage others here to help out Vladimir. Data with errors not greater than 0.02 mag and long sessions are needed.

Clear Skies, Petr [2017-10-21 07:38, Ondrejov] Message sent to BinAstPhotSurvey conference

(3744) Horn-dArturo (Finished) - possible binary, needs to be confirmed in the future [Add new note]
· Binary suspect, to be confirmed in the future.

Petr [2018-05-26 09:18, Ondrejov]

· Observed on Oct. 26-27 (19:06-00:47 UT).
Vladimir [2017-10-27 11:53, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed on Oct. 25-26 (17:38-00:06 UT).
Vladimir [2017-10-26 12:00, Sopot AO]

· Vladimir Benishek has observed this off-list object from Sopot on 4 nights. There appear to be two lightcurve components:
http://www.asu.cas.cz/~asteroid/03744_p1.png
http://www.asu.cas.cz/~asteroid/03744_p2.png

Vladimir wants to take more data to nail it down, but he has got bad weather recently. He would therefore appreciate if someone could help out with this one. Errors of 0.01 mag and long sessions are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2017-10-24 10:23, Ondrejov] Message sent to BinAstPhotSurvey conference

(78754) 2002 TA295 (Finished) - slow rotator [Add new note]
· Slow rotator. Closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-05-25 11:14, Ondrejov]

· Started this at 01:15 UT.
Don [2016-08-09 01:29, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target on July 6 and plan to observe it tonight.
Don [2016-07-07 01:36, Sugarloaf]

(54754) 2001 KJ56 (Finished) [Add new note]
· Insufficient data for this one. Target closed.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2018-05-25 10:57, Ondrejov]

· Started this one on Jan 27.
Don [2018-01-29 02:54, Sugarloaf] Message sent to BinAstPhotSurvey conference

(42111) 2001 AZ46 (Finished) [Add new note]
· The data for this one gives only an U = 2 solution, which is not good enough for this case within the BinAstPhotSurvey. Target closed.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2018-05-25 10:49, Ondrejov]

· I started a run on this at 22:30, Dec 6 UT.
Don [2017-12-06 22:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this new target on Nov 21 UT.
Don [2017-11-21 20:08, Sugarloaf]

(4221) Picasso (Finished) [Add new note]
· Vladimir Benishek did another new target from Sopot: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04221.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-05-21 11:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed additionally on 2 nights (May 17-18,19:47-01:47 UT and May 19-20,19:43-00:59 UT).
Vladimir [2018-05-20 13:32, Sopot AO]

· I worked this new target on four nights (May 7-8, 8-9, 9-10 and 11-12 UT).
Vladimir [2018-05-12 12:57, Sopot AO] Message sent to BinAstPhotSurvey conference

(5518) Mariobotta (Finished) - slow rotator [Add new note]
· Vladimir Benishek worked this new target from Sopot, found it to be a slow rotator (U = 3, PAR = 0).
http://www.asu.cas.cz/~asteroid/05518.png
Object closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-05-21 11:31, Ondrejov] Message sent to BinAstPhotSurvey conference

(6315) 1990 TS (Finished) [Add new note]
· Target closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-05-04 13:47, Ondrejov]

· I started this new target Nov 24 UT.
Don [2017-11-24 18:55, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4155) Watanabe (Finished) - "prime suspect" [Add new note]
· Object closed for the 2nd apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-05-04 13:23, Ondrejov]

· continue data gathering in September and July, 09/17,09/18,09/19,09/20,09/21,09/22 [2017-09-24 00:51, Blue Mountains Obs] Message sent to observers

· observed on 06/29,06/30,07/01 [2017-07-02 04:41, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This target is finished after four nights from Skalnate Pleso. Period of 4.4972 h is unique, no deviations >0.04 mag seen and sufficient coverage:

http://www.asu.cas.cz/~asteroid/04155.png

Nice work, Marek et al.

Peter K. [2006-11-27 15:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· All 4 nights were sent to Peter K.
My estimated period is about 4.49 h with 0.20 mag amplitude.
Marek [2006-11-27 13:20, SkalnatePleso] [Remove]

· Observing from 16:40 UT in a good conditions. Michal [2006-11-26 16:43, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 18:10 UT in average conditions. Michal [2006-11-25 18:17, SkalnatePleso] [Remove]

· Observing from 17:00 UT in a good conditions. Michal [2006-11-24 17:00, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 18:15 UT in a good conditions at the moment.Michal [2006-11-23 18:46, SkalnatePleso] [Remove]

(11917) 1992 UX (Finished) - slow rotator [Add new note]
· Slow rotator, closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-05-04 11:18, Ondrejov]

· Start observing new asteroid tonight. [2017-10-13 09:02, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2682) Soromundi (Finished) [Add new note]
· Insufficient data for the Survey. Closed. [2018-05-04 09:09, Ondrejov]

· Start observing from DRO(Perth) by Roger. [2017-10-13 09:06, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2194) Arpola (Finished) - slow rotator [Add new note]
· Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-05-02 13:30, Ondrejov]

· I observed this new target on two nights: Mar. 8-9 (22:09-03:42 UT) and Mar. 9-10 (19:35-02:03 UT).
Vladimir [2018-03-10 12:38, Sopot AO] Message sent to BinAstPhotSurvey conference

(8474) Rettig (Finished) - return binary [Add new note]
· Done for the 2nd apparition.
http://www.asu.cas.cz/~asteroid/08474_b8.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-04-24 07:12, Ondrejov]

· I started a run at 00:30 and hope to catch the 0.249 phase event.
Don [2018-04-06 00:43, Sugarloaf] Message sent to observers

· Data taken by Don Pray from Sugarloaf Mountain and by Marek Husarik and coll. from Skalnate Pleso in this apparition so far:
http://www.asu.cas.cz/~asteroid/08474_b8.png

More data for both events would be useful. Errors <= 0.03 mag and a full event coverage is needed; don't bother if you cannot take +/-2 hours around the predicted mid-event times. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 4- 3 14.27 0.249
2018- 4- 4 20.81 0.249
2018- 4- 6 3.35 0.249
2018- 4- 7 9.89 0.249
2018- 4- 8 16.43 0.249
2018- 4- 9 22.97 0.249
2018- 4-11 5.51 0.249
2018- 4-12 12.05 0.249
2018- 4-13 18.59 0.249
2018- 4-15 1.13 0.249
2018- 4-16 7.67 0.249
2018- 4-17 14.21 0.249
2018- 4-18 20.75 0.249
2018- 4-20 3.29 0.249
2018- 4-21 9.83 0.249
2018- 4-22 16.37 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2018- 4- 4 5.53 0.749
2018- 4- 5 12.07 0.749
2018- 4- 6 18.61 0.749
2018- 4- 8 1.15 0.749
2018- 4- 9 7.69 0.749
2018- 4-10 14.23 0.749
2018- 4-11 20.77 0.749
2018- 4-13 3.31 0.749
2018- 4-14 9.85 0.749
2018- 4-15 16.39 0.749
2018- 4-16 22.93 0.749
2018- 4-18 5.47 0.749
2018- 4-19 12.01 0.749
2018- 4-20 18.55 0.749
2018- 4-22 1.09 0.749
2018- 4-23 7.63 0.749

Clear Skies, Petr [2018-03-28 06:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on March 24 to take data for 0.25 phase event.
And we try to take data outside of the events on March 25.
Marek [2018-03-25 19:51, SkalnatePleso] [Remove]
Message sent to observers

· Don Pray took first data for this return fully synchronous binary in its current apparition:
http://www.asu.cas.cz/~asteroid/08474_b8.png

More data (with errors <= 0.03 mag) are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2018- 3-21 5.54 0.250
2018- 3-22 12.08 0.250
2018- 3-23 18.62 0.250
2018- 3-25 1.16 0.250
2018- 3-26 7.70 0.250
2018- 3-27 14.24 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2018- 3-21 20.80 0.750
2018- 3-23 3.34 0.750
2018- 3-24 9.88 0.750
2018- 3-25 16.42 0.750
2018- 3-26 22.96 0.750

Clear Skies, Petr [2018-03-20 14:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this return binary at 00:40 UT.
Don [2018-03-18 00:51, Sugarloaf]

· Our discovery announcement on this one has appeared on CBET 4122, copied below for your convenience.

(8474) RETTIG
V. Chiorny, Kharkiv Observatory; V. Benishek, Belgrade Astronomical
Observatory, Serbia; P. Pravec and P. Kusnirak, Ondrejov Observatory;
Yu. N. Krugly, Kharkiv Observatory; J. Oey and R. Groom, Blue Mountains
Observatory, Leura, NSW, Australia; V. Reddy, Planetary Science Institute;
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
W. Cooney and J. Gross, Sonoita Research Observatory, Sonoita, AZ, U.S.A.;
D. Terrell, Southwest Research Institute; R. Inasaridze, V. Ayvazian and
V. Zhuzhanidze, Abastumani Observatory; R. Montaigut and A. Leroy, OPERA
Observatory, France; and I. Molotov, Keldysh Institute of Applied
Mathematics, Moscow, report that photometric observations obtained during
May 19-July 23 reveal that minor planet (8474) is a binary system with an
orbital period of 30.54 Â± 0.01 hr. Mutual eclipse/occultation events
that are 0.60- to 0.93-magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.86. Rotations of the
components appear to be synchronous with the orbital motion and an
amplitude of the combined primary plus secondary rotational lightcurve is
0.34 mag at solar phases 7-15 deg.

2015 July 26 (CBET 4122) Daniel W. E. Green

Our final data from this apparition:
http://www.asu.cas.cz/~asteroid/08474_201505_06.png
http://www.asu.cas.cz/~asteroid/08474_201507.png

Cheers, Petr [2015-07-27 05:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current data for this new fully-synchronous near-equal size components binary:
http://www.asu.cas.cz/~asteroid/08474.png

We may do a discovery CBET on it any day now, but additional observations of the mutual events in the changing geometry in this month would be useful for nailing down the system's paramaters; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 7- 5 7.82 0.250
2015- 7- 6 14.36 0.250
2015- 7- 7 20.90 0.250
2015- 7- 9 3.44 0.250
2015- 7-10 9.98 0.250
2015- 7-11 16.52 0.250
2015- 7-12 23.06 0.250
2015- 7-14 5.60 0.250
2015- 7-15 12.14 0.250
2015- 7-16 18.68 0.250
2015- 7-18 1.22 0.250
2015- 7-19 7.76 0.250
2015- 7-20 14.30 0.250
2015- 7-21 20.84 0.250
2015- 7-23 3.38 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2015- 7- 5 23.08 0.750
2015- 7- 7 5.62 0.750
2015- 7- 8 12.16 0.750
2015- 7- 9 18.70 0.750
2015- 7-11 1.24 0.750
2015- 7-12 7.78 0.750
2015- 7-13 14.32 0.750
2015- 7-14 20.86 0.750
2015- 7-16 3.40 0.750
2015- 7-17 9.94 0.750
2015- 7-18 16.48 0.750
2015- 7-19 23.02 0.750
2015- 7-21 5.56 0.750
2015- 7-22 12.10 0.750
2015- 7-23 18.64 0.750

Clear Skies, Petr [2015-07-02 07:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will run from SRO tonight if it clears up. Good night to catch the entire 0.75 event. -Walt [2015-06-16 00:21, Sonoita] Message sent to observers

· Observed on 3 previous nights from Sopot (06/12, 20:22 - 23:49 UT; 06/13, 20:09 - 23:12 UT; 06/14, 23:01 - 23:57 UT).
Vladimir [2015-06-15 10:34, Sopot AO]

· Will run from SRO tonight. -Walt [2015-06-11 01:56, Sonoita] Message sent to observers

· Observed last night 8/9 June from 19:45 to 23:35 UT in good conditions. Vasilij Ch. [2015-06-09 08:05, Kharkiv]

· New data by Vladimir Benishek from Sopot, Don Pray from Sugarloaf Mountain, Vishnu Reddy from Tucson, Julian Oey from Leura, Vasilij Chiorny from Grakovo, and Raguli Inasaridze, V. Ayavazian and Yura Krugly from Abastumani and Kharkiv have been joined in. Current solution:
http://www.asu.cas.cz/~asteroid/08474.png

More data for both events are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 6- 9 5.66 0.262
2015- 6-10 12.20 0.262
2015- 6-11 18.74 0.262
2015- 6-13 1.28 0.262
2015- 6-14 7.82 0.262
2015- 6-15 14.36 0.262
2015- 6-16 20.90 0.262
2015- 6-18 3.44 0.262
2015- 6-19 9.98 0.262
2015- 6-20 16.52 0.262
2015- 6-21 23.06 0.262
2015- 6-23 5.60 0.262
2015- 6-24 12.14 0.262
2015- 6-25 18.68 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2015- 6- 8 14.40 0.762
2015- 6- 9 20.94 0.762
2015- 6-11 3.48 0.762
2015- 6-12 10.02 0.762
2015- 6-13 16.56 0.762
2015- 6-14 23.10 0.762
2015- 6-16 5.64 0.762
2015- 6-17 12.18 0.762
2015- 6-18 18.72 0.762
2015- 6-20 1.26 0.762
2015- 6-21 7.80 0.762
2015- 6-22 14.34 0.762
2015- 6-23 20.88 0.762
2015- 6-25 3.42 0.762
2015- 6-26 9.96 0.762

Clear Skies, Petr [2015-06-08 07:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing at 19:40 up to 23:40 UT in clear weather.
Yura [2015-06-07 19:52, Kharkiv] Message sent to observers

· Observed last night (June 06, 19:59 - 23:54 UT) from Sopot.
Vladimir [2015-06-07 10:27, Sopot AO]

· I'll be starting a run at 02:00 UT.
Don [2015-06-07 01:47, Sugarloaf] Message sent to observers

· observed on both nights of 06/05 9:48UT and 06/06 8:37UT [2015-06-06 12:25, Blue Mountains Obs]

· Observed last night (June 05-06, 20:10 - 23:56 UT).
Vladimir [2015-06-06 10:05, Sopot AO] Message sent to observers

· Started observing at 19:20 UT.
Yura [2015-06-05 19:46, Kharkiv]

· New observations by Julian Oey from Leura, by Vishnu Reddy from Tucson and by Vladimir Benishek from Sopot have been joined in. The period seems to be unique, but there are discrepancies in the magnitude scale zero points that we need to solve/get understanding of with more data. See
http://www.asu.cas.cz/~asteroid/08474.png
The shape of the minimum is suggestive of a fully synchronous, near-equal size component binary, but let's wait for more data (also for the other minimum), also to see a characteristic evolution of the minima with changing solar phase. We also need to cover rotational phases inbetween the minima; observations at any rotational phases are needed.

Clear Skies, Petr [2015-05-30 12:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing at 20:05 UT, May 29.
Vladimir [2015-05-29 22:33, Sopot AO] Message sent to observers

· I'll be starting this one also at 02:40 UT.
Don [2015-05-29 00:43, Sugarloaf]

· started observing from 11:52UT 05/27 . Good condition and event captured. [2015-05-28 05:28, Blue Mountains Obs] Message sent to observers

· Started observing at 4:45 UTC. Will observe till 8:45 UTC. [2015-05-28 05:07, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek from Sopot and Vasilij Chiorny from Kharkiv have taken the first three sessions for this new target. Vasilij has captured a deep minimum that has a shape similar to what we see in fully synchronous binaries with near-equal sized components. See following plot (the period is rather uncertain):
http://www.asu.cas.cz/~asteroid/08474.png

More data are needed to establish it. I encourage others here to take part. Long sessions are needed; don't bother if you cannot take at least three hours worth of data on a given night.

Clear Skies, Petr [2015-05-27 09:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night (May 20-21, 22:46 - 01:38 UT)from Sopot.
Vladimir [2015-05-21 10:47, Sopot AO] Message sent to observers

· Observed this one last night from 19:35 UT to 24:05 UT.
Vasilij Ch. [2015-05-20 00:13, Kharkiv]

· I observed this new target last night (May 18-19, ~ 21:13 - 01:35 UT).
Vladimir [2015-05-19 13:56, Sopot AO] Message sent to BinAstPhotSurvey conference

(5724) 1986 WE (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on 4 nights: Unique solution, satisfactory coverage, no deviation.
http://www.asu.cas.cz/~asteroid/05724.png
Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-04-10 07:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one on Mar 20 UT.
Don [2018-03-21 01:47, Sugarloaf]

(5129) Groom (Finished) [Add new note]
· Marek Husarik and coll. did this return "prime suspect" from Skalnate Pleso on 6 partial nights recently: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05129_2018a.png
http://www.asu.cas.cz/~asteroid/05129_2018b.png
Target closed.

Petr [2018-03-26 13:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on March 22 and 23. And 24 too.
Marek [2018-03-24 21:45, SkalnatePleso] [Remove]
Message sent to observers

· Observed on Feb 16 and 18.
Marek [2018-02-19 14:03, SkalnatePleso] [Remove]

· Observed this returning "prime suspect" on Feb 10.
Marek [2018-02-12 09:29, SkalnatePleso] [Remove]
Message sent to observers

· Julian Oey has done this return "prime suspect" enough for this apparition: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05129_b6.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-10-12 10:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 09/26 and 10/05 [2016-10-12 08:43, Blue Mountains Obs] Message sent to observers

· observed on 09/21,09/25 and 09/29. [2016-09-30 12:04, Blue Mountains Obs]

· Start a new prime suspect. [2016-09-25 04:52, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Don Pray did this return "prime suspect" from Sugarloaf Mountain on five nights (some partial). His data agree well with the previous two apparition, good coverage, no deviation:
http://www.asu.cas.cz/~asteroid/05129_b2.png
Done sufficiently, closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-08-28 14:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 03:20 UT.
Don [2012-08-17 02:21, Sugarloaf]

· I did a short session on this on Aug 8, and plan to do a longer run tonight starting at 03:50 UT.
Don [2012-08-09 02:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This return prime suspect was done in the 2nd apparition by Peter K. and Kamil from here, by Stefan, Adrian and Peter V. from Modra, and by Joe with Prompt. Good coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/05129_b1.png
Done in the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2011-04-14 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began the observation at 23:50 UT, the weather changes fast (clouds on the west). Peter. [2011-04-03 23:51, Modra] Message sent to observers

· Observing starting 0200 UT from Prompt under good conditions. Joe [2011-04-03 03:06, Dark Sky & PROMPT]

· Starting a session, at 22:00 UT. Peter. [2011-04-02 22:42, Modra] Message sent to observers

· Observing this object more two hours from 23:20 2011-04-01.
Best wishes - Vasilij Ch. [2011-04-02 15:44, Kharkiv]

· Weather forecast was bad for this region tonight, but, in fact, it is not so bad. So a few points may help. Adrian [2011-04-02 00:40, Modra] Message sent to BinAstPhotSurvey conference

· Began observing at Prompt at 0200 UT under excellent conditions. Will attempt to follow until ~0940 UT. Joe [2011-03-28 02:37, Dark Sky & PROMPT] Message sent to observers

· Observing this one for two hours from 1:30 UT. Best wishes, Kamil [2011-03-27 11:02, Ondrejov]

· Two short sessions for this "prime suspect" taken by Peter K. from here and Stefan from Modra recently:
http://www.asu.cas.cz/~asteroid/05129_b1.png
A couple more sessions should do it well for this apparition.

Clear Skies, Petr [2011-03-18 14:24, Ondrejov]

· Observed for 3 hours last night. Peter K. [2011-03-15 12:05, Ondrejov] Message sent to observers

· Trying this old target - a first trial before end of present lunation (but observable to May) from 00:33 UT.

Stefan [2011-03-14 01:36, Modra]

· Yes, this one has been well done by David from Hunters Hill and by Julian from Leura: Unique period, good coverage, no significant deviation seen. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-02-17 13:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 15/16 Feb. Poor conditions on 15 but excellent conditions on 16. Data reveasl a period of 3.6395 +/- 0.0003 hrs with an amplitude of 0.15 +/- 0.02mag. Other than the potentially poor data observed by Petr in the last lunation, no deviations detected. I think we can close this one. [2007-02-17 06:44, HuntersHill] Message sent to BinAstPhotSurvey conference

· Julian's data of Jan30 cover the same interval as David's data:
http://www.asu.cas.cz/~asteroid/5129_070130_leura.png
http://www.asu.cas.cz/~asteroid/5129_070130_huntershill.png
It apparently was background stars that Julian mentioned. I point out that it is of prime importance to keep data quality; data points affected by background stars, if the effect cannot be eliminated at an accuracy level better than 0.03 mag, must not be used. Stars fainter by <=4 mag wrt the asteroid have to be eliminated or affected data points not used.

The first night Jan28 where data by Julian and David overlap again looks ok.

David, your second night shows some marginal deviations (of a lesser degree than those in the third night). I think it is nothing significant, but you might want to look at them.

Petr [2007-01-31 12:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· I got 2 nights for 28/01 (12:09 to 15:17 UT) and 30/01 (11:40 to 18:28 UT). Its relatively clean data resulting in a bimodal curve of similar period to David's. No sign of the moon effect. Data on the 30th have a couple of stars SBG'd.
Data sent in .
Julian [2007-01-31 11:01, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Hi David. I see the increased deviations in the third night data (and to a lesser degree also in the second night). It is not clear to me yet, more data after the Full Moon will be needed. (Btw, were not there effects from the bright waxing and approaching Moon on the third night?)

Clear Skies, Petr [2007-01-31 09:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:53UT to 18:16UT in good conditions. The data looks good but a good fit cannot be achieved. Most obvious fit is at 3.649 +/- 0.005hrs but there are significant deviations. I believe this target is suspicious.

Data sent to Petr for analysis. [2007-01-31 08:26, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 28/29th. First session terminated due to a scope pointing failure but a full second night observed. Data reveals a period of 3.63 +/- 0.02 hrs with an amplitude of 0.18 +/- 0.02mag. [2007-01-30 10:31, HuntersHill] Message sent to BinAstPhotSurvey conference

(1492) Oppolzer (Finished) [Add new note]
· Don Pray observed this return "prime suspect" from Sugarloaf Mountain on 4 nights, supported by one short session by Hana Kucakova and Kamil Kusnirak from here. Good solution and coverage, no significant deviation in data taken in good conditions.
http://www.asu.cas.cz/~asteroid/01492_b8.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-03-21 12:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target has been done by Jan Vrastil, Kamil Hornoch, Hana Kucakova and Peter Kusnirak from here, and by Vishnu Reddy from Tucson: Good solution and coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/01492.png
Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Cheers, Petr [2015-04-29 07:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work from SRO tonight while Vishnu covers 4514 from Tucson. -Walt [2015-04-24 01:06, Sonoita] Message sent to observers

· Observed during last two nights. It looks that we captured two events of a new binary. Best wishes, Kamil and Honza [2015-04-21 07:31, Ondrejov]

· Started observing at 06:15 UTC. Plan to observe it till 10 UTC. [2015-04-19 06:32, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

(3437) Kapitsa (Finished) [Add new note]
· This new target was observed by Don Pray and Vladimir Benishek (the recent recipients of the NEO Shoemaker Grant --- Congratulations!). A good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/03437.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2018-03-15 07:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this on Feb 19.
Don [2018-02-19 18:49, Sugarloaf]

(21282) Shimizuyuka (Finished) [Add new note]
· Julian Oey has observed this new target. The data suggests two periods, possible binary, but the solution is weak. It will have to be confirmed in the future.
http://www.asu.cas.cz/~asteroid/21282_p1.png
http://www.asu.cas.cz/~asteroid/21282_p2.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-02-28 12:31, Ondrejov]

· Observed on 12/09 [2018-01-12 11:44, Blue Mountains Obs] Message sent to observers

· start new target [2017-12-06 19:40, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(10450) Girard (Finished) [Add new note]
· Julian Oey did this new target on 3 nights: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/10450.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2018-02-26 08:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· start a new target 02/15,02/18. [2018-02-19 12:17, Blue Mountains Obs]

(2764) Moeller (Finished) [Add new note]
· Vladimir Benishek took two long sessions for this new target from Sopot: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02764.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2018-02-09 08:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed again last night (18:18-02:38 UT).
Vladimir [2018-01-26 12:39, Sopot AO]

· I started this new target last night (Jan. 24-25, 18:03-02:28 UT).
Vladimir [2018-01-25 13:44, Sopot AO] Message sent to BinAstPhotSurvey conference

(5802) Casteldelpiano (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain, supported with a partial night by Marek Husarik from Skalnate Pleso: An U = 2+ solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05802.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-02-01 09:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this new target on Jan 10.
Don [2018-01-12 15:18, Sugarloaf]

(5668) Foucault (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on three nights: Good solution, multiple coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05668.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2018-02-01 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this on Jan 15, and will be running it again tonight.
Don [2018-01-26 00:35, Sugarloaf]

(4435) Holt (Finished) - binary [Add new note]
· Our report on this one has appeared on CBET 4480, copied below for your convenience.

Cheers, Petr

(4435) HOLT
R. Stephens, Center for Solar System Studies, Rancho Cucamonga, CA,
U.S.A.; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, P. Kusnirak, H. Kucakova, and K. Hornoch, Ondrejov Observatory;
and V. Benishek, Belgrade Astronomical Observatory, report that photometric
observations obtained with a 0.40-m telescope at the Center for Solar System
Studies, a 0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.65-m
telescope at the Ondrejov Observatory, and a 0.35-m telescope at the Sopot
Observatory in Serbia during 2017 Aug. 30-2018 Jan. 19 reveal that minor
planet (4435) is a binary system with an orbital period of 42.65 Â± 0.05 hr.
The primary shows a period of 2.8670 Â± 0.0002 hr and has a lightcurve
amplitude of 0.15 mag at solar phases 20-25 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are up to 0.15-
magnitude deep indicate a lower limit on the secondary-to-primary mean-
diameter ratio of 0.34. The secondary appears synchronous and has a
lightcurve amplitude in the combined primary plus secondary lightcurve of
0.05 mag. There occurred a few additional 0.07- to 0.17-mag-deep
attenuations between 2017 Oct. 12 and Dec. 5 that were not aligned with the
42.65-hr orbital period, suggesting presence of a third body in the system.
The mean absolute magnitude of the whole system in the Cousins R
photometric system is H_R = 13.25 Â± 0.13, assuming the slope parameter G
= 0.24 Â± 0.11.

2018 January 27 (CBET 4480) Daniel W. E. Green [2018-01-29 07:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new binary (suspect ternary) was observed extensively by Bob Stephens from CS3 and by Don Pray from Sugarloaf Mountain, supported with a few nights by us from here and by Vladimir Benishek from Sopot. We have submitted an announcement to CBET.
http://www.asu.cas.cz/~asteroid/04435_2017j_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017j_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017i_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017i_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017h_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017h_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017g_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017g_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017f_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017f_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017e_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017e_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017d_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017d_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017c_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017c_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017b_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017b_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017a_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017a_p1.png

Cheers, Petr [2018-01-22 06:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 22:30 UT.
Don [2017-12-06 22:39, Sugarloaf]

· Started this at 22:30, Nov 27 UT.
Don [2017-11-27 22:40, Sugarloaf]

· Started his at 22:30, Nov 24 UT.
Don [2017-11-24 22:30, Sugarloaf] Message sent to observers

· Started a run at 23:20, Nov 23 UT.
Don [2017-11-23 23:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 00:30 UT.
Don [2017-11-18 00:36, Sugarloaf]

· Started this one at 23:40, Nov 8 UT
Don [2017-11-09 00:41, Sugarloaf]

· Started a run at 00:05 UT.
Don [2017-10-31 00:07, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting a run at 23:10, Oct 28 UT.
Don [2017-10-27 23:04, Sugarloaf]

· Started this at 23:45, Oct 22 UT.
Don [2017-10-23 00:30, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray, Bob Stephens, and others have observed this new target extensively over the past two months. There are apparently developing events and a likely orbital period is 42.65 h, but we don't understand the data fully yet so more observations are needed.
http://www.asu.cas.cz/~asteroid/04435_2017d_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017d_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017c_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017c_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017b_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017b_p1.png
http://www.asu.cas.cz/~asteroid/04435_2017a_porb.png
http://www.asu.cas.cz/~asteroid/04435_2017a_p1.png

Particularly useful would be observations from other continents than America (where it seems well covered by Bob and Don), so I encourage here observers from Europe to help out. However, good data only (and preferrably long sessions) are needed; don't bother if you cannot get errors of 0.015 mag or better.

Clear Skies, Petr [2017-10-21 07:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 23:35, Oct 19 UT.
Don [2017-10-20 00:02, Sugarloaf]

· Starting this one at 23:45, Oct 18 UT.
Don [2017-10-18 23:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 23:45, Oct 17 UT.
Don [2017-10-17 23:57, Sugarloaf]

· Target might be a binary. Primary period of 2.866 hours seem secure. There might be a secondary period of about 22.5 hours. Perhaps combining with Don's larger dataset will help confirm. Will send data I have to Petr. [2017-10-15 01:46, Santana] Message sent to observers

· Ran this one last night (Oct 13 UT).
Don [2017-10-13 14:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:00 UT.
Don [2017-10-11 00:03, Sugarloaf]

· Started this at 00:40 UT.
Don [2017-09-25 01:52, Sugarloaf]

· Started a run at 00:30 UT.
Don [2017-09-24 01:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this one at 01:10 UT.
Don [2017-09-17 02:12, Sugarloaf]

· Starting this at 02:00 UT.
Don [2017-09-11 00:59, Sugarloaf]

· I did a run on this new target on Sep 10.
DOn [2017-09-10 20:12, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3865) Lindbloom (Finished) [Add new note]
· This new target was observed by Walt Cooney and coll. from Starry Night Observatory and SRO, and by Marek Husarik from Skalnate Pleso. Revealed a low-amplitude object; no better than U = 2 solution could be obtained for it.
http://www.asu.cas.cz/~asteroid/03865.png
http://www.asu.cas.cz/~asteroid/03865_nsp.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort guys on the tough object.

Petr [2018-01-18 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Start a new target [2017-12-23 22:02, Blue Mountains Obs]

(4514) Vilen (Finished) - return binary [Add new note]
· Unsuccessfull campaign, closing now. Petr [2018-01-15 07:57, Ondrejov]

· I did a run on this on Jan 7.
Don [2018-01-07 18:54, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Hana Kucakova and Kamil Hornoch observed this return binary (2nd apparition) from here on 2017-12-27.0. They observed it outside events apparently:
http://www.asu.cas.cz/~asteroid/04514_2017a_p1.png
http://www.asu.cas.cz/~asteroid/04514_2017a_porb.png

We don't know when we will be able to take more data, so I encourage others here to help out when the Moon is out of the way. Errors <= 0.03 mag are needed and long sessions are prefered; don't bother in less ideal conditions.

Happy New Year!

Petr [2018-01-02 08:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed tonight to capture phase 0.75 event. [2015-05-25 14:19, Blue Mountains Obs] Message sent to observers

· Our discovery announcement on the binary nature of this one has appeared on CBET on Friday, the text of the circular is copied below for your convenience.

Cheers, Petr

(4514) VILEN
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, K. Hornoch, P. Kusnirak, J. Vrastil and H. Kucakova, Ondrejov
Observatory; V. Chiorny and V. Shevchenko, Kharkiv Observatory; V. Reddy,
Planetary Science Institute, Tucson; W. Cooney and J. Gross, Sonoita Research
Observatory, Sonoita, AZ, U.S.A.; and D. Terrell, Southwest Research
Institute, report that photometric observations obtained during Apr. 16-May 12
reveal that minor planet (4514) is a binary system with an orbital period of
16.85 ± 0.01 hr. The primary shows a period of 2.89224 ± 0.00009 hr, and
it has a lightcurve amplitude of 0.09 mag at solar phases 8-14 deg, suggesting
a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.07-
to 0.14-magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.26.
V. Reddy, D. Takir and J. A. Sanchez, Planetary Science Institute,
Tucson; and P. S. Hardersen, University of North Dakota, Grand Forks, report
that near-infrared spectroscopic observations (0.7-2.5 microns) of minor
planet (4514), obtained on 2015 Apr. 25 using the NASA Infrared Telescope
Facility on Mauna Kea, show that it is an X/M-type minor planet with a weak
pyroxene absorption band at 1 micron.

2015 May 22 (CBET 4101) Daniel W. E. Green [2015-05-25 10:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 19:50 UT. Gabo [2015-05-18 19:18, SkalnatePleso] [Remove]
Message sent to observers

· Our discovery report on this one has been submitted to CBET. Current status:
http://www.asu.cas.cz/~asteroid/04514_201504_porb.png
http://www.asu.cas.cz/~asteroid/04514_201504_p1.png
http://www.asu.cas.cz/~asteroid/04514_201505_porb.png
http://www.asu.cas.cz/~asteroid/04514_201505_p1.png

One more good coverage for each of the two events with errors not greater than 0.02 mag (don't bother in sub-optimal conditions) would be useful before the apparition is over in a couple weeks; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 5-16 3.54 0.254
2015- 5-16 20.39 0.254
2015- 5-17 13.24 0.254
2015- 5-18 6.09 0.254
2015- 5-18 22.94 0.254
2015- 5-19 15.79 0.254
2015- 5-20 8.64 0.254
2015- 5-21 1.49 0.254
2015- 5-21 18.34 0.254
2015- 5-22 11.19 0.254
2015- 5-23 4.04 0.254
2015- 5-23 20.89 0.254
2015- 5-24 13.74 0.254
2015- 5-25 6.59 0.254
2015- 5-25 23.44 0.254
2015- 5-26 16.29 0.254
2015- 5-27 9.14 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2015- 5-15 18.96 0.745
2015- 5-16 11.81 0.745
2015- 5-17 4.66 0.745
2015- 5-17 21.51 0.745
2015- 5-18 14.36 0.745
2015- 5-19 7.21 0.745
2015- 5-20 0.06 0.745
2015- 5-20 16.91 0.745
2015- 5-21 9.76 0.745
2015- 5-22 2.61 0.745
2015- 5-22 19.46 0.745
2015- 5-23 12.31 0.745
2015- 5-24 5.16 0.745
2015- 5-24 22.01 0.745
2015- 5-25 14.86 0.745
2015- 5-26 7.71 0.745
2015- 5-27 0.56 0.745

Clear Skies, Petr [2015-05-15 14:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one on last night from 21:30 U.T. to 00:20 U.T.
Vasilij Ch. [2015-05-13 00:51, Kharkiv] Message sent to observers

· Target observed from 19:20 UT. Gabo [2015-05-11 19:28, SkalnatePleso] [Remove]

· Object observed from 21:30 UT. Gabo [2015-05-08 21:49, SkalnatePleso] [Remove]
Message sent to observers

· New data taken by Kamil Hornoch and Hana Kucakova from here and by Vasilij Shevchenko and Vasilij Chiorny from Kharkiv were joined in.
http://www.asu.cas.cz/~asteroid/04514_porb.png
http://www.asu.cas.cz/~asteroid/04514_p1.png

Before we publish this one on CBET, it would be good to take some more good-quality data for each of the two events, to refine P_orb and D_2/D_1. Errors not greater than 0.02 mag are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 5- 7 0.49 0.254
2015- 5- 7 17.34 0.254
2015- 5- 8 10.19 0.254
2015- 5- 9 3.04 0.254
2015- 5- 9 19.89 0.254
2015- 5-10 12.74 0.254
2015- 5-11 5.59 0.254
2015- 5-11 22.44 0.254
2015- 5-12 15.29 0.254
2015- 5-13 8.14 0.254
2015- 5-14 0.99 0.254
2015- 5-14 17.84 0.254
2015- 5-15 10.69 0.254
2015- 5-16 3.54 0.254
2015- 5-16 20.39 0.254
2015- 5-17 13.24 0.254
2015- 5-18 6.09 0.254
2015- 5-18 22.94 0.254
2015- 5-19 15.79 0.254
2015- 5-20 8.64 0.254
2015- 5-21 1.49 0.254
2015- 5-21 18.34 0.254
2015- 5-22 11.19 0.254
2015- 5-23 4.04 0.254
2015- 5-23 20.89 0.254
2015- 5-24 13.74 0.254
2015- 5-25 6.59 0.254
2015- 5-25 23.44 0.254
2015- 5-26 16.29 0.254
2015- 5-27 9.14 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2015- 5- 7 8.94 0.756
2015- 5- 8 1.79 0.756
2015- 5- 8 18.64 0.756
2015- 5- 9 11.49 0.756
2015- 5-10 4.34 0.756
2015- 5-10 21.19 0.756
2015- 5-11 14.04 0.756
2015- 5-12 6.89 0.756
2015- 5-12 23.74 0.756
2015- 5-13 16.59 0.756
2015- 5-14 9.44 0.756
2015- 5-15 2.29 0.756
2015- 5-15 19.14 0.756
2015- 5-16 11.99 0.756
2015- 5-17 4.84 0.756
2015- 5-17 21.69 0.756
2015- 5-18 14.54 0.756
2015- 5-19 7.39 0.756
2015- 5-20 0.24 0.756
2015- 5-20 17.09 0.756
2015- 5-21 9.94 0.756
2015- 5-22 2.79 0.756
2015- 5-22 19.64 0.756
2015- 5-23 12.49 0.756
2015- 5-24 5.34 0.756
2015- 5-24 22.19 0.756
2015- 5-25 15.04 0.756
2015- 5-26 7.89 0.756
2015- 5-27 0.74 0.756

Clear Skies, Petr [2015-05-03 13:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one on 26 April from 19.3 U.T. to 22.3 U.T.
Vasilij Sh, Vasilij Ch. [2015-04-27 11:02, Kharkiv] Message sent to observers

· A run by Vasilij Chiorny from Kharkiv of 2015-04-23.0 has nailed down P_orb:
http://www.asu.cas.cz/~asteroid/04514_porb.png
http://www.asu.cas.cz/~asteroid/04514_p1.png

One or two more good coverages for each of the two events would be useful to refine P_orb and D_2/D_1. Only good data, covering the events fully and with errors not greater than 0.02 mag will be useful; don't bother in sub-optimal conditions. Events ephemeris is below.

We should publish a discovery announcement for this one (as well as for 4541 Mizuno) in the next week.

Date/Time UTC (LTc.) Phase
--------------------------
2015- 4-24 9.18 0.253
2015- 4-25 2.03 0.253
2015- 4-25 18.88 0.253
2015- 4-26 11.73 0.253
2015- 4-27 4.58 0.253
2015- 4-27 21.43 0.253
2015- 4-28 14.28 0.253
2015- 4-29 7.13 0.253
2015- 4-29 23.98 0.253
2015- 4-30 16.83 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2015- 4-24 17.59 0.753
2015- 4-25 10.44 0.753
2015- 4-26 3.29 0.753
2015- 4-26 20.14 0.753
2015- 4-27 12.99 0.753
2015- 4-28 5.84 0.753
2015- 4-28 22.69 0.753
2015- 4-29 15.54 0.753
2015- 4-30 8.39 0.753

Clear Skies, Petr [2015-04-24 06:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing at 4:20 UTC. Will 0bserve till 9:40 UTC. [2015-04-24 04:50, Vishnu Reddy/Tucson] Message sent to observers

· Observed this one last night from 22:25 UTC to 01:05 UTC
Vasilij Ch. [2015-04-23 10:10, Kharkiv]

· Started Observing at 4:00 UTC. Should be able to observe till 9:30 UTC. [2015-04-23 05:17, Vishnu Reddy/Tucson] Message sent to observers

· New data by Vishnu Reddy, Don Pray and Walt Cooney joined in:
http://www.asu.cas.cz/~asteroid/04514_p1.png
http://www.asu.cas.cz/~asteroid/04514_porb.png
There are a few possible values for the orbital period (the plot above is for the shortest one of them). More observations are needed to establish it uniquely.

Clear Skies, Petr [2015-04-22 06:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm planning to start this at 02:10 UT and should go until 08:10.
Don [2015-04-22 00:45, Sugarloaf] Message sent to observers

· Started run at 4:30 UTC. Will be observing till 9:30 UTC. [2015-04-21 04:32, Vishnu Reddy/Tucson]

· Will run from SRO tonight. -Walt [2015-04-21 01:30, Sonoita] Message sent to observers

· Started observing at 4:30 UTC. Should be able to observe till 9:30 UTC. [2015-04-20 04:31, Vishnu Reddy/Tucson]

· Don Pray has taken three nights for this new target from Sugarloaf Mountain. There is a main period of 2.89 h (U = 2+ or 3-) and what appears to be a second lightcurve component (period not well determined yet), plus a possible event:
http://www.asu.cas.cz/~asteroid/04514_p1.png
http://www.asu.cas.cz/~asteroid/04514_p2.png

I encourage others here to help out.

Clear Skies, Petr [2015-04-19 13:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 02:30 UT.
Don [2015-04-19 01:31, Sugarloaf]

· Plan to start this at 02:30 UT.
Don [2015-04-18 00:57, Sugarloaf]

· Will be starting this new target at 02:40 UT.
Don [2015-04-16 02:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

(8256) Shenzhou (Finished) [Add new note]
· Vladimir Benishek did this return "prime suspect" from Sopot well for this apparition: Unique solution, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/08256_b7.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2018-01-08 13:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Dec. 25-26 (18:03-04:18 UT).
Vladimir [2017-12-26 14:00, Sopot AO]

· I observed this returning "prime suspect" on Dec. 24-25 (19:10-04:47 UT).
Vladimir [2017-12-25 23:02, Sopot AO] Message sent to BinAstPhotSurvey conference

· Don Pray has done this "prime suspect" (i.e., asteroid with period in the range of binaries, but which showed no sign of binarity in the previous apparition(s)) from Sugarloaf Mountain on three nights recently: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/08256_b5.png
Target done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-03-04 06:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 01:40 UT, and hope to get a complete rotation.
Don [2015-02-26 02:04, Sugarloaf] Message sent to observers

· Started a run at 01:50 UT.
Don [2015-02-24 03:09, Sugarloaf] Message sent to BinAstPhotSurvey conference

· David has done this one on three nights from Hunters Hill: Unique period, nice coverage, no deviation. It is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, David.

Cheers, Petr [2007-10-16 13:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-15 from 09:53UT to 17:32UT in poor conditions. Data refined period to 3.3963 +/- 0.0008hrs with amplitude 0.3 +/- 0.02mag. No deviations noted. The Monomodal fit at 1/2 period has almost the same fit RMS as the Bimodal period. [2007-10-15 22:11, HuntersHill] Message sent to observers

· Observed 2007-10-14 from 09:59UT to 17:46UT in poor conditions. Period refined to 3.396 +/- 0.002hrs with an amplitude of 0.3 +/- 0.02mag. No deviations detected. [2007-10-14 22:23, HuntersHill]

· Observed 2007-10-13 from 10:03UT to 17:54UT in reasonable conditions. I did take limited data on the 9th but the session only provided 8 data points. Data reveals a period of 3.454 +/- 0.002hrs with an amplitude of 0.30 +/- 0.02mag. [2007-10-14 03:01, HuntersHill] Message sent to BinAstPhotSurvey conference

(3706) Sinnott (Finished) [Add new note]
· Another new target done by Don Pray from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/03706.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work again Don.

Petr [2018-01-03 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one on Dec 27.
Don [2017-12-27 15:15, Sugarloaf]

(6280) Sicardy (Finished) [Add new note]
· Don Pray took two long nights for this new target from Sugarloaf Mountain: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/06280.png
http://www.asu.cas.cz/~asteroid/06280_nsp.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work Don.

Petr [2018-01-02 11:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this new target on Dec 27.
Don [2017-12-27 16:02, Sugarloaf]

(42843) 1999 RV11 (Finished) - slow rotator [Add new note]
· Vladimir Benishek did this new target from Sopot, supported with one night by Don Pray from Sugarloaf Mountain. It is a very slow rotator and there are clear signs of tumbling, but a second period couldn't be determined so it is PAR = -2.
http://www.asu.cas.cz/~asteroid/42843.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Cheers, Petr [2017-12-18 09:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:30 UT.
Don [2017-09-24 01:01, Sugarloaf]

· Observed on Sep. 15 (18:37-20:41 UT) and Sep. 16 (18:19-22:00 UT).
Vladimir [2017-09-18 19:29, Sopot AO] Message sent to BinAstPhotSurvey conference

(13977) Frisch (Finished) [Add new note]
· Julian Oey has done this return "prime suspect" satisfactorily for this apparition: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/13977_b7.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian.

Petr [2017-12-17 10:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 12/07,12/09,12/10,12/11,12/12,12/13 [2017-12-17 10:15, Blue Mountains Obs]

· This "prime suspect" (i.e., asteroid with period and amplitude in or close to the range in the parameter space where binaries are frequent) was observed by Amadeo Aznar on five and by Don Pray on two nights in its current 3rd apparition. As before, no significant deviations seen:
http://www.asu.cas.cz/~asteroid/13977_b6.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2016-06-09 09:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one on May 26. I plan another run on it tonight.
Don [2016-06-01 00:13, Sugarloaf]

· This return "prime suspect" was done by David Higgins from Hunters Hill on three nights in this second apparition: good solution, sufficient coverage, no significant deviation seen. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-06-11 13:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed in average to poor conditions 29, 30 and 31st May. Data reveals a period of 4.989 +/- 0.005 hrs with an amplitude of 0.15 +/- 0.02mag. [2012-06-05 10:14, HuntersHill]

· Six nights by Don from Carbuncle Hill and by Jozef, Stefan, and Leos from Modra: Unique solution, good coverage, no prominent deviation,
http://www.asu.cas.cz/~asteroid/13977.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-05-11 16:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21 UT. Jozef, Stefan. [2008-05-09 23:37, Modra]

· Started again at 20:50 UT. Jozef, Stefan. [2008-05-08 21:38, Modra] Message sent to observers

· Tonight we obtained 5 hours of data in good conditions, starting ~20:30 UT (2008-05-06). Jozef, Leos. [2008-05-07 02:54, Modra]

· I'll be starting this at 02:30 UT.
Don [2008-05-01 00:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run on this at 02:55 UT.
Don [2008-04-30 03:03, CarbuncleHill]

· Starting this one tonight.
Don [2008-04-25 03:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(2133) Franciswright (Finished) [Add new note]
· Julian Oey did this new target from Leura: Unique solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02133.png
Closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-12-08 09:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting to observe tonight from Leura [2017-10-13 09:01, Blue Mountains Obs]

(3378) Susanvictoria (Finished) - binary [Add new note]
· Our discovery announcement on this one has appeared on CBET 4459, copied below for your convenience.

Cheers, Petr

(3378) SUSANVICTORIA
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; V. Benishek, Belgrade Astronomical
Observatory; and R. Montaigut and A. Leroy, OPERA Observatory, France,
report that photometric observations obtained with a 0.50-m telescope at the
Sugarloaf Mountain Observatory, a 0.35-m telescope at the Sopot Observatory
in Serbia, and a 0.20-m telescope at the OPERA Observatory during Oct. 17-
Nov. 28 reveal that minor planet (3378) is a binary system with an orbital
period of 17.13 Â± 0.01 hr. The primary shows a period of 2.5621 Â±
0.0001 hr and has a lightcurve amplitude of 0.10 mag at solar phases 6-9
degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.06- to 0.13-magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.24.

2017 December 8 (CBET 4459) Daniel W. E. Green [2017-12-08 07:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/03378_2017a_porb.png
http://www.asu.cas.cz/~asteroid/03378_2017a_p1.png
http://www.asu.cas.cz/~asteroid/03378_2017b_porb.png
http://www.asu.cas.cz/~asteroid/03378_2017b_p1.png
We are doing a CBET now.

Last data for this discovery apparition would be useful to take in the next month. Errors of 0.02 mag are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017-12- 7 8.64 0.237
2017-12- 8 1.77 0.237
2017-12- 8 18.90 0.237
2017-12- 9 12.03 0.237
2017-12-10 5.16 0.237
2017-12-10 22.29 0.237
2017-12-11 15.42 0.237
2017-12-12 8.55 0.237
2017-12-13 1.68 0.237
2017-12-13 18.81 0.237
2017-12-14 11.94 0.237
2017-12-15 5.07 0.237
2017-12-15 22.20 0.237
2017-12-16 15.33 0.237
2017-12-17 8.46 0.237
2017-12-18 1.59 0.237
2017-12-18 18.72 0.237
2017-12-19 11.85 0.237
2017-12-20 4.98 0.237
2017-12-20 22.11 0.237
2017-12-21 15.24 0.237
2017-12-22 8.37 0.237
2017-12-23 1.50 0.237
2017-12-23 18.63 0.237
2017-12-24 11.76 0.237
2017-12-25 4.89 0.237
2017-12-25 22.02 0.237

Date/Time UTC (LTc.) Phase
--------------------------
2017-12- 7 0.12 0.739
2017-12- 7 17.25 0.739
2017-12- 8 10.38 0.739
2017-12- 9 3.51 0.739
2017-12- 9 20.64 0.739
2017-12-10 13.77 0.739
2017-12-11 6.90 0.739
2017-12-12 0.03 0.739
2017-12-12 17.16 0.739
2017-12-13 10.29 0.739
2017-12-14 3.42 0.739
2017-12-14 20.55 0.739
2017-12-15 13.68 0.739
2017-12-16 6.81 0.739
2017-12-16 23.94 0.739
2017-12-17 17.07 0.739
2017-12-18 10.20 0.739
2017-12-19 3.33 0.739
2017-12-19 20.46 0.739
2017-12-20 13.59 0.739
2017-12-21 6.72 0.739
2017-12-21 23.85 0.739
2017-12-22 16.98 0.739
2017-12-23 10.11 0.739
2017-12-24 3.24 0.739
2017-12-24 20.37 0.739
2017-12-25 13.50 0.739

Clear Skies, Petr [2017-11-29 08:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 22:30, Nov 27 UT, and should catch the 0.762 phase event.
Don [2017-11-27 22:39, Sugarloaf] Message sent to observers

· Started a run at 22:35, Nov 24 UT. Hope to catch the 0.241 phase event.
Don [2017-11-24 22:34, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this one on Nov 23, 23:20 UT, and will hopefully catch the event at 3:30 UT.
Don [2017-11-23 23:35, Sugarloaf]

· Observed on Nov. 20-21 (19:01-01:02 UT).
Vladimir [2017-11-21 20:44, Sopot AO] Message sent to observers

· Started a run at 23:40, Nov 8 UT, and should catch the 0.752 event.
Don [2017-11-09 00:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 00:00 UT and should catch the 0.241 phase event.
Don [2017-10-31 00:09, Sugarloaf]

· More data by Don Pray from Sugarloaf Mountain and by Vladimir Benishek from Sopot nailed down the orbital period. Current solution:
http://www.asu.cas.cz/~asteroid/03378_porb.png
http://www.asu.cas.cz/~asteroid/03378_p1.png

Before we publish it on CBET, more data for both events are needed, to refine the orbital period and the size ratio, and also to better resolve between the primary and secondary events. However, high quality (errors < 0.015 mag) data are are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017-10-31 5.80 0.241
2017-10-31 22.92 0.241
2017-11- 7 9.00 0.241
2017-11- 8 2.12 0.241
2017-11- 8 19.24 0.241
2017-11- 9 12.36 0.241
2017-11-10 5.48 0.241
2017-11-10 22.60 0.241
2017-11-11 15.72 0.241
2017-11-12 8.84 0.241
2017-11-13 1.96 0.241
2017-11-13 19.08 0.241
2017-11-14 12.20 0.241
2017-11-15 5.32 0.241
2017-11-15 22.44 0.241
2017-11-16 15.56 0.241
2017-11-17 8.68 0.241
2017-11-18 1.80 0.241
2017-11-18 18.92 0.241
2017-11-19 12.04 0.241
2017-11-20 5.16 0.241
2017-11-20 22.28 0.241
2017-11-21 15.40 0.241
2017-11-22 8.52 0.241
2017-11-23 1.64 0.241
2017-11-23 18.76 0.241
2017-11-24 11.88 0.241
2017-11-25 5.00 0.241
2017-11-25 22.12 0.241
2017-11-26 15.24 0.241
2017-11-27 8.36 0.241
2017-11-28 1.48 0.241
2017-11-28 18.60 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2017-10-30 21.43 0.752
2017-10-31 14.55 0.752
2017-11- 7 0.63 0.752
2017-11- 7 17.75 0.752
2017-11- 8 10.87 0.752
2017-11- 9 3.99 0.752
2017-11- 9 21.11 0.752
2017-11-10 14.23 0.752
2017-11-11 7.35 0.752
2017-11-12 0.47 0.752
2017-11-12 17.59 0.752
2017-11-13 10.71 0.752
2017-11-14 3.83 0.752
2017-11-14 20.95 0.752
2017-11-15 14.07 0.752
2017-11-16 7.19 0.752
2017-11-17 0.31 0.752
2017-11-17 17.43 0.752
2017-11-18 10.55 0.752
2017-11-19 3.67 0.752
2017-11-19 20.79 0.752
2017-11-20 13.91 0.752
2017-11-21 7.03 0.752
2017-11-22 0.15 0.752
2017-11-22 17.27 0.752
2017-11-23 10.39 0.752
2017-11-24 3.51 0.752
2017-11-24 20.63 0.752
2017-11-25 13.75 0.752
2017-11-26 6.87 0.752
2017-11-26 23.99 0.752
2017-11-27 17.11 0.752
2017-11-28 10.23 0.752

Clear Skies, Petr [2017-10-30 12:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:10 UT.
Don [2017-10-28 00:46, Sugarloaf]

· Observed from Sopot on Oct. 26-27 (18:19-03:09 UT).
Vladimir [2017-10-27 11:49, Sopot AO] Message sent to observers

· Don Pray did this new target from Sugarloaf Mountain on 4 nights. It is a serious binary candidate. Following lc decomposition is somewhat tentative, more data are needed to nail down it.
http://www.asu.cas.cz/~asteroid/03378_porb.png
http://www.asu.cas.cz/~asteroid/03378_p1.png

I encourage others here to help out Don. Data with errors <= 0.02 mag are needed and long sessions are preferred.

Clear Skies, Petr [2017-10-24 07:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:30 UT.
Don [2017-10-23 00:31, Sugarloaf]

· Started a run on this at 00:45, Oct 19 UT.
Don [2017-10-18 23:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this new target on Oct 17.
Don [2017-10-18 00:00, Sugarloaf]

(4605) Nikitin (Finished) - probable binary [Add new note]
· This new target was observed by Vladimir Benishek from Sopot and by Don Pray from Sugarloaf Mountain. There are two lc components, but no obvious events. It is a probable binary. Lc decomposition:
http://www.asu.cas.cz/~asteroid/04605_p1.png
http://www.asu.cas.cz/~asteroid/04605_p2.png
http://www.asu.cas.cz/~asteroid/04605_p2_nsp.png

Closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-12-01 10:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night (Oct. 16-17 UT).
Vladimir [2017-10-17 12:11, Sopot AO]

· I observed this new target on two nights (Oct. 11-12 and Oct. 12-13 UT).
Vladimir [2017-10-13 12:12, Sopot AO] Message sent to BinAstPhotSurvey conference

(3749) Balam (Finished) - return system [Add new note]
· Done for this apparition. [2017-12-01 09:20, Ondrejov]

· More data were taken by Amadeo Aznar and coll. from IAC and Sierra Nevada Observatory, and by Don Pray from Sugarloaf Mountain. Our data for this system in this apparition so far:
http://www.asu.cas.cz/~asteroid/03749_2017c_porb.png
http://www.asu.cas.cz/~asteroid/03749_2017c_p1.png
http://www.asu.cas.cz/~asteroid/03749_2017b_porb.png
http://www.asu.cas.cz/~asteroid/03749_2017b_p1.png
http://www.asu.cas.cz/~asteroid/03749_2017a_porb.png
http://www.asu.cas.cz/~asteroid/03749_2017a_p1.png

Last data for this apparition in November would be useful for this complex system. Errors < 0.03 mag are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017-11- 8 2.76 0.252
2017-11- 9 12.14 0.252
2017-11-10 21.52 0.252
2017-11-12 6.90 0.252
2017-11-13 16.28 0.252
2017-11-15 1.66 0.252
2017-11-16 11.04 0.252
2017-11-17 20.42 0.252
2017-11-19 5.80 0.252
2017-11-20 15.18 0.252
2017-11-22 0.56 0.252
2017-11-23 9.94 0.252
2017-11-24 19.32 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2017-11- 7 9.99 0.750
2017-11- 8 19.37 0.750
2017-11-10 4.75 0.750
2017-11-11 14.13 0.750
2017-11-12 23.51 0.750
2017-11-14 8.89 0.750
2017-11-15 18.27 0.750
2017-11-17 3.65 0.750
2017-11-18 13.03 0.750
2017-11-19 22.41 0.750
2017-11-21 7.79 0.750
2017-11-22 17.17 0.750
2017-11-24 2.55 0.750

Clear Skies, Petr [2017-10-31 07:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Taking data on this tonight to establish primary lightcurve.
Don [2017-10-27 23:07, Sugarloaf] Message sent to observers

· Data obtained for this system so far in this apparition:
http://www.asu.cas.cz/~asteroid/03749_2017a_porb.png
http://www.asu.cas.cz/~asteroid/03749_2017a_p1.png
http://www.asu.cas.cz/~asteroid/03749_2017b_porb.png
http://www.asu.cas.cz/~asteroid/03749_2017b_p1.png

More data would be useful, errors < 0.03 mag needed (don't bother in suboptimal conditions please). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017-10- 9 21.78 0.252
2017-10-11 7.16 0.252
2017-10-12 16.54 0.252
2017-10-14 1.92 0.252
2017-10-15 11.30 0.252
2017-10-16 20.68 0.252
2017-10-18 6.06 0.252
2017-10-19 15.44 0.252
2017-10-21 0.82 0.252
2017-10-22 10.20 0.252
2017-10-23 19.58 0.252
2017-10-25 4.96 0.252
2017-10-26 14.34 0.252
2017-10-27 23.72 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2017-10- 9 5.07 0.752
2017-10-10 14.45 0.752
2017-10-11 23.83 0.752
2017-10-13 9.21 0.752
2017-10-14 18.59 0.752
2017-10-16 3.97 0.752
2017-10-17 13.35 0.752
2017-10-18 22.73 0.752
2017-10-20 8.11 0.752
2017-10-21 17.49 0.752
2017-10-23 2.87 0.752
2017-10-24 12.25 0.752
2017-10-25 21.63 0.752
2017-10-27 7.01 0.752
2017-10-28 16.39 0.752

Clear Skies, Petr [2017-10-02 14:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has taken first data for this system from Sugarloaf Mountain in its current apparition:
http://www.asu.cas.cz/~asteroid/03749_2017a_porb.png
http://www.asu.cas.cz/~asteroid/03749_2017a_p1.png

More data with errors < 0.03 mag would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 9-13 11.49 0.250
2017- 9-14 20.87 0.250
2017- 9-16 6.25 0.250
2017- 9-17 15.63 0.250
2017- 9-19 1.01 0.250
2017- 9-20 10.39 0.250
2017- 9-21 19.77 0.250
2017- 9-23 5.15 0.250
2017- 9-24 14.53 0.250
2017- 9-25 23.91 0.250
2017- 9-27 9.29 0.250
2017- 9-28 18.67 0.250
2017- 9-30 4.05 0.250
2017-10- 1 13.43 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2017- 9-14 4.17 0.750
2017- 9-15 13.55 0.750
2017- 9-16 22.93 0.750
2017- 9-18 8.31 0.750
2017- 9-19 17.69 0.750
2017- 9-21 3.07 0.750
2017- 9-22 12.45 0.750
2017- 9-23 21.83 0.750
2017- 9-25 7.21 0.750
2017- 9-26 16.59 0.750
2017- 9-28 1.97 0.750
2017- 9-29 11.35 0.750
2017- 9-30 20.73 0.750

Clear Skies, Petr [2017-09-13 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at around 02:00 UT.
Don [2017-09-13 02:23, Sugarloaf] Message sent to observers

· Starting this one at 01:55 UT.
Don [2017-09-11 01:04, Sugarloaf]

· I started this Sep 10 UT, but moon caused high errors.
Don [2017-09-10 15:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for this apparition. Petr [2015-01-07 11:07, Ondrejov]

· Very good data have been taken for this complex system in this apparition so far:
http://www.asu.cas.cz/~asteroid/03749_2014a_porb.png
http://www.asu.cas.cz/~asteroid/03749_2014a_p1.png
http://www.asu.cas.cz/~asteroid/03749_2014b_porb.png
http://www.asu.cas.cz/~asteroid/03749_2014b_p1.png
http://www.asu.cas.cz/~asteroid/03749_2014c_porb.png
http://www.asu.cas.cz/~asteroid/03749_2014c_p1.png

Further monitoring with errors not greater than 0.02 mag would be useful in the upcoming (last, for this apparition) lunation; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-12- 9 12.16 0.255
2014-12-10 21.54 0.255
2014-12-12 6.92 0.255
2014-12-13 16.30 0.255
2014-12-15 1.68 0.255
2014-12-16 11.06 0.255
2014-12-17 20.44 0.255
2014-12-19 5.82 0.255
2014-12-20 15.20 0.255
2014-12-22 0.58 0.255
2014-12-23 9.96 0.255
2014-12-24 19.34 0.255
2014-12-26 4.72 0.255
2014-12-27 14.10 0.255
2014-12-28 23.48 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2014-12-10 4.47 0.744
2014-12-11 13.85 0.744
2014-12-12 23.23 0.744
2014-12-14 8.61 0.744
2014-12-15 17.99 0.744
2014-12-17 3.37 0.744
2014-12-18 12.75 0.744
2014-12-19 22.13 0.744
2014-12-21 7.51 0.744
2014-12-22 16.89 0.744
2014-12-24 2.27 0.744
2014-12-25 11.65 0.744
2014-12-26 21.03 0.744
2014-12-28 6.41 0.744

Clear Skies, Petr [2014-12-01 14:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt Tololo at 0030 UT. Hope to cover secondary event at 0240 UT. Joe [2014-11-22 02:38, Dark Sky & PROMPT] Message sent to observers

· More good data for both events were taken by Don Pray from Sugarloaf Mountain in the past lunation.
http://www.asu.cas.cz/~asteroid/03749_2014_porb.png
http://www.asu.cas.cz/~asteroid/03749_2014_p1.png

Continued monitoring of both events (covering each of them twice per lunation would be ideal) will be useful in the next lunation; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-10 7.14 0.254
2014-11-11 16.52 0.254
2014-11-13 1.90 0.254
2014-11-14 11.28 0.254
2014-11-15 20.66 0.254
2014-11-17 6.04 0.254
2014-11-18 15.42 0.254
2014-11-20 0.80 0.254
2014-11-21 10.18 0.254
2014-11-22 19.56 0.254
2014-11-24 4.94 0.254
2014-11-25 14.32 0.254
2014-11-26 23.70 0.254
2014-11-28 9.08 0.254
2014-11-29 18.46 0.254
2014-12- 1 3.84 0.254
2014-12- 2 13.22 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-10 23.62 0.748
2014-11-12 9.00 0.748
2014-11-13 18.38 0.748
2014-11-15 3.76 0.748
2014-11-16 13.14 0.748
2014-11-17 22.52 0.748
2014-11-19 7.90 0.748
2014-11-20 17.28 0.748
2014-11-22 2.66 0.748
2014-11-23 12.04 0.748
2014-11-24 21.42 0.748
2014-11-26 6.80 0.748
2014-11-27 16.18 0.748
2014-11-29 1.56 0.748
2014-11-30 10.94 0.748
2014-12- 1 20.32 0.748

Clear Skies, Petr [2014-11-05 09:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 02:50, and hope to catch most of the 0.755 phase event.
Don [2014-10-30 03:14, Sugarloaf] Message sent to observers

· I started this at 01:15 UT, and should capture much of the 0.255 phase event.
Don [2014-10-28 01:20, Sugarloaf]

· I plan to start this object about 21:00-22:00 UT.

I started at 21:30 UT. Zuzana [2014-10-18 21:45, SkalnatePleso] [Remove]
Message sent to observers

· We have taken the first two nights for this intriguing multiple system for this lunation, captured an event:
http://www.asu.cas.cz/~asteroid/03749_2014_porb.png
http://www.asu.cas.cz/~asteroid/03749_2014_p1.png

More data are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-14 4.13 0.255
2014-10-15 13.52 0.255
2014-10-16 22.90 0.255
2014-10-18 8.29 0.255
2014-10-19 17.67 0.255
2014-10-21 3.06 0.255
2014-10-22 12.44 0.255
2014-10-23 21.83 0.255
2014-10-25 7.21 0.255
2014-10-26 16.60 0.255
2014-10-28 1.98 0.255
2014-10-29 11.37 0.255
2014-10-30 20.75 0.255
2014-11- 1 6.14 0.255
2014-11- 2 15.52 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-14 20.81 0.755
2014-10-16 6.19 0.755
2014-10-17 15.58 0.755
2014-10-19 0.96 0.755
2014-10-20 10.35 0.755
2014-10-21 19.73 0.755
2014-10-23 5.12 0.755
2014-10-24 14.50 0.755
2014-10-25 23.89 0.755
2014-10-27 9.27 0.755
2014-10-28 18.66 0.755
2014-10-30 4.04 0.755
2014-10-31 13.43 0.755
2014-11- 1 22.81 0.755
2014-11- 3 8.20 0.755

Clear Skies, Petr [2014-10-06 10:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Campaign closed, starting modeling. Petr [2012-03-29 13:53, Ondrejov]

· Observing this one with (14627) from 18:40 UT to 00:00 UT. Best wishes, Kamil and Honza [2012-03-16 21:24, Ondrejov] Message sent to observers

· Trying to catch 0.75 phase tonight.
Marek [2012-03-15 19:52, SkalnatePleso] [Remove]

· Began observing Balam at 0040 UT with the 32" from NC under excellent conditions. Joe [2012-03-11 01:12, Dark Sky & PROMPT] Message sent to observers

· Great data for the primary event of 02-10.9 were taken by Kamil from here, plus some limited data (or ones needing completion) by others for this interesting system in the past lunation; current status:
http://www.asu.cas.cz/~asteroid/03749_12_porb.png
http://www.asu.cas.cz/~asteroid/03749_12_p1.png
http://www.asu.cas.cz/~asteroid/03749_12_p2.png

Last observations for both events, plus a coverage of both the 2.8- and 11.7-h rotational components outside events -they change shapes- would be good for this apparition when the moon is out of the way later in this month; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-12 10.46 0.268
2012- 3-13 19.84 0.268
2012- 3-15 5.22 0.268
2012- 3-16 14.60 0.268
2012- 3-17 23.98 0.268
2012- 3-19 9.36 0.268
2012- 3-20 18.74 0.268
2012- 3-22 4.12 0.268
2012- 3-23 13.50 0.268
2012- 3-24 22.88 0.268
2012- 3-26 8.26 0.268
2012- 3-27 17.64 0.268
2012- 3-29 3.02 0.268

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-11 17.13 0.749
2012- 3-13 2.51 0.749
2012- 3-14 11.89 0.749
2012- 3-15 21.27 0.749
2012- 3-17 6.65 0.749
2012- 3-18 16.03 0.749
2012- 3-20 1.41 0.749
2012- 3-21 10.79 0.749
2012- 3-22 20.17 0.749
2012- 3-24 5.55 0.749
2012- 3-25 14.93 0.749
2012- 3-27 0.31 0.749
2012- 3-28 9.69 0.749
2012- 3-29 19.07 0.749

Clear Skies, Petr [2012-03-05 12:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began observing with 32" in NC ~0030 UT. Hope to cover 0.748 event tonight centered at 0440 UT. Joe [2012-02-28 00:55, Dark Sky & PROMPT] Message sent to observers

· Observed under excellent conditions from 02:36-08:30 UT [2012-02-15 13:50, Via Capote]

· Trying the 0.748 event, if weather holds, from 18:46 UT.
Stefan [2012-02-12 19:08, Modra] Message sent to observers

· observing full session under good conditions from 02:45UT
session was lost due to rapid weather change
[2012-02-12 14:20, Via Capote]

· Observing this one from 17:40 UT with uncertainties about 0.01 mag. Best wishes, Kamil [2012-02-10 21:33, Ondrejov] Message sent to observers

· observed under good conditions before clouded out from 05:00-08:40UT [2012-02-01 13:32, Via Capote]

· Great effort by Jim Brinsfield from Via Capote (8 nights), by Kamil Hornoch and Jan Vrastil from here (2), by Joe Pollock from Appalachian State University (1), by Jozef Vilagi and Leos Kornos from Modra (1), and by Marek and Michal from Skalnate Pleso (1). The periods observed in the 2007 binary discovery apparition were confirmed: P_1 = 2.8048 h and P_orb(inner sat) = 33.38 h. A refined lower limit on the size ratio D_2(inner)/D_1 = 0.43. There is apparent another rotational lightcurve component with a period of 11.70 h, we think that it belongs to one of the satellites in the system, but we cannot attribute it uniquely to the inner or the outer one with the available data. This is another such case we have found, similar to the cases of (1830) Pogson, (2006) Polonskaya and (2577) Litva, see Pravec et al. (2012),
http://dx.doi.org/10.1016/j.icarus.2011.11.026
Plots of the components of the current solution:
http://www.asu.cas.cz/~asteroid/03749_12_p1.png
http://www.asu.cas.cz/~asteroid/03749_12_p2.png
http://www.asu.cas.cz/~asteroid/03749_12_p2nsp.png
http://www.asu.cas.cz/~asteroid/03749_12_porb.png

The current solution explains all the features in the data except two. One of them is the couple narrow peaks in the 01-29.3 session around orbit phase 0.32 in the last plot above. The other, a more striking one is the drop by 0.06 mag at orbit phases 0.9-1.0 in the 01-30.3 session. We may speculate if the latter attenuation is not a mutual event of the outer satellite .... More data will be needed to shed a light.

The coverage of the inner satellite's mutual events has been sufficient for this lunation. Though more coverage -long sessions at any orbit phase- would never harm for this complex system (especially if we want to capture the suspect shallow attenuation again), an effort concentrated on the inner satellite's mutual events will be needed to be resumed in the next lunation; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-12 5.25 0.261
2012- 2-13 14.63 0.261
2012- 2-15 0.01 0.261
2012- 2-16 9.39 0.261
2012- 2-17 18.77 0.261
2012- 2-19 4.15 0.261
2012- 2-20 13.53 0.261
2012- 2-21 22.91 0.261
2012- 2-23 8.29 0.261
2012- 2-24 17.67 0.261
2012- 2-26 3.05 0.261
2012- 2-27 12.43 0.261
2012- 2-28 21.81 0.261
2012- 3- 1 7.19 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-11 12.12 0.748
2012- 2-12 21.50 0.748
2012- 2-14 6.88 0.748
2012- 2-15 16.26 0.748
2012- 2-17 1.64 0.748
2012- 2-18 11.02 0.748
2012- 2-19 20.40 0.748
2012- 2-21 5.78 0.748
2012- 2-22 15.16 0.748
2012- 2-24 0.54 0.748
2012- 2-25 9.92 0.748
2012- 2-26 19.30 0.748
2012- 2-28 4.68 0.748
2012- 2-29 14.06 0.748
2012- 3- 1 23.44 0.748

Clear Skies, Petr [2012-01-31 08:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· planning on full coverage run starting at 03:30 [2012-01-29 23:27, Via Capote] Message sent to observers

· We will start this one at 17:40 UT under little bit worse conditions. Uxpecting full-night run, if weather hold. Best wishes, Honza and Kamil [2012-01-29 17:43, Ondrejov]

· under decreasing wind, planning on full coverage run tonight beginning at 03:30-12:00UT [2012-01-29 02:20, Via Capote] Message sent to observers

· Observing from 19:10 UT in a good conditions. Michal [2012-01-27 19:20, SkalnatePleso] [Remove]

· planning on full coverage run tonight begining at phase 0.750 attenuation [2012-01-26 21:13, Via Capote] Message sent to observers

· Observed under good conditions 09:30-12:00UT [2012-01-26 14:58, Via Capote]

· This is an updated solution for the lightcurve components of the primary and of the inner couple of this system, with new observations by Jim from Via Capote, by Kamil from here (with one mistake fixed) and by Jozef and Leos from Modra:
http://www.asu.cas.cz/~asteroid/03749_12_porb.png
http://www.asu.cas.cz/~asteroid/03749_12_p1.png

Updated events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-27 21.71 0.250
2012- 1-29 7.09 0.250
2012- 1-30 16.47 0.250
2012- 2- 1 1.85 0.250
2012- 2- 2 11.23 0.250
2012- 2- 3 20.61 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-27 5.01 0.750
2012- 1-28 14.39 0.750
2012- 1-29 23.77 0.750
2012- 1-31 9.15 0.750
2012- 2- 1 18.53 0.750
2012- 2- 3 3.91 0.750

Clear Skies, Petr [2012-01-26 14:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to catch the phase 0.752 event tonight, starting ~18:20UT, even if conditions are a bit uncertain... Jozef, Leos. [2012-01-25 18:19, Modra]

· Observed under fair conditions for the phase .252 event. Early part of the session was lost due to cloud and low transparency improving later in the session. 04:40-7:30UT [2012-01-25 14:15, Via Capote] Message sent to observers

· Sky currently good. Planning long 32-inch run tonight to get full primary event around 0400 UT. Joe [2012-01-25 00:28, Dark Sky & PROMPT]

· long session observed under very good conditions 04:14-12:30UT [2012-01-19 14:03, Via Capote] Message sent to observers

· First data by Jim Brinsfield from Via Capote and by Kamil Hornoch from here in this return apparition of the multiple system, they provide a good synergy together. Jim's observations have defined the primary's lightcurve and Kamil's run shows about half of an attenuation (we assume the periods as estimated in the 2007 discovery apparition by Marchis et al. 2008, IAUC 8928), see
http://www.asu.cas.cz/~asteroid/03749_12_porb.png

Covering each of its two events twice per lunation is needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-19 14.70 0.252
2012- 1-21 0.08 0.252
2012- 1-22 9.46 0.252
2012- 1-23 18.84 0.252
2012- 1-25 4.22 0.252
2012- 1-26 13.60 0.252
2012- 1-27 22.98 0.252
2012- 1-29 8.36 0.252
2012- 1-30 17.74 0.252
2012- 2- 1 3.12 0.252
2012- 2- 2 12.50 0.252
2012- 2- 3 21.88 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-20 7.37 0.752
2012- 1-21 16.75 0.752
2012- 1-23 2.13 0.752
2012- 1-24 11.51 0.752
2012- 1-25 20.89 0.752
2012- 1-27 6.27 0.752
2012- 1-28 15.65 0.752
2012- 1-30 1.03 0.752
2012- 1-31 10.41 0.752
2012- 2- 1 19.79 0.752
2012- 2- 3 5.17 0.752

Clear Skies, Petr [2012-01-19 06:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began on it at 0200 UT from Prompt but GRB ended observations at 0400 UT. Joe [2012-01-19 04:40, Dark Sky & PROMPT] Message sent to observers

· I plan to work this target from 04:00-12:30UT. Conditions are favorable tonight but will deteriorate tomorrow and through the weekend. [2012-01-19 01:42, Via Capote]

· Hello team

Happy New Year! (I know it is a bit late)
We observed using the super-LOTIS robotic telescope this triple asteroid on
Dec 15 5:20-12:20
Dec 16
Dec 29
Dec 30
Dec 31
Jan 01
Jan 02

Since then we had technical difficulties and/or bad weather.
super-LOTIS is out until Friday Jan 20, so additional support will be definitely useful.

Data will be soon sent to Peter Pravec.

Cheers
F. [2012-01-18 23:47, Marchis] Message sent to BinAstPhotSurvey conference

· observed under good conditions 06:50-12:40UT [2012-01-18 14:18, Via Capote] Message sent to observers

· Observed 1.5h after clouds came out. Best wishes, Kamil [2012-01-18 05:19, Ondrejov]

· Observed under fair conditions with decreasing transparency from 06:10 to 11:00UT [2012-01-14 14:38, Via Capote] Message sent to BinAstPhotSurvey conference

(2047) Smetana (Finished) [Add new note]
· Closed for this apparition. Will need more data in the future, to figure out what it is in this case. Petr [2017-12-01 09:14, Ondrejov]

· observed on 10/15,10/16,10/17,10/18,10/21 from JBL [2017-10-21 21:44, Blue Mountains Obs] Message sent to observers

· observed on 09/16,09/18,09/19,09/20,09/21,09/22 [2017-09-24 07:09, Blue Mountains Obs]

· Start a prime suspect [2017-09-16 22:31, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(13255) 1998 OH14 (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on three nights: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/13255.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Don.

Petr [2017-11-21 19:35, Ondrejov] Message sent to BinAstPhotSurvey conference

(11211) 1999 GD24 (Finished) [Add new note]
· Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-11-09 12:31, Ondrejov]

· I observed this new target on 16/17 Aug from 18:30 to 01:00 UT. Vasilij Ch. [2017-08-18 13:04, Kharkiv] Message sent to BinAstPhotSurvey conference

(10132) Lummelunda (Finished) - binary [Add new note]
· Done for the discovery apparition. [2017-11-09 12:23, Ondrejov]

· Our discovery report on this one has appeared on CBET 4440, copied below for your convenience.

Cheers, Petr

(10132) LUMMELUNDA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, P. Kusnirak,
and H. Kucakova, Ondrejov Observatory; F. Pilcher, Organ Mesa Observatory,
Las Cruces, NM, U.S.A.; D. Pray, Sugarloaf Mountain Observatory, South
Deerfield, MA, U.S.A.; R. Durkee, Shed of Science Observatory, Minneapolis,
MN, U.S.A.; A. Aznar, Astronomia Para Todos Observatories Group, "European
Near Earth Asteroids Research" (EURONEAR) project, Spain; and F. J. Aceituno,
Observatorio de Sierra Nevada, report that photometric observations taken
with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope
at the Ondrejov Observatory, a 0.35-m at the Organ Mesa Observatory, a 0.50-m
telescope at the Sugarloaf Mountain Observatory, a 0.50-m telescope at the
Shed of Science Observatory, and a 0.9-m telescope at the Observatorio de
Sierra Nevada during Aug. 27-Sept. 28 reveal that minor planet (10132) is a
binary system with an orbital period of 22.44 Â± 0.01 hr. The primary shows
a period of 2.5099 Â± 0.0001 hr and has a lightcurve amplitude of 0.11 mag
at solar phases 2-3 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.08- to 0.16-magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.28.

2017 October 9 (CBET 4440) Daniel W. E. Green [2017-10-10 05:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have just submitted our announcement on this one to CBET. Lc decompositions:
http://www.asu.cas.cz/~asteroid/10132_2017a_porb.png
http://www.asu.cas.cz/~asteroid/10132_2017a_p1.png
http://www.asu.cas.cz/~asteroid/10132_2017b_porb.png
http://www.asu.cas.cz/~asteroid/10132_2017b_p1.png
http://www.asu.cas.cz/~asteroid/10132_2017c_porb.png
http://www.asu.cas.cz/~asteroid/10132_2017c_p1.png

Follow-up observations would be useful for future modeling. Errors not greater than 0.02 mag are needed; don't bother in suboptimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017-10- 9 8.45 0.270
2017-10-10 6.89 0.270
2017-10-11 5.33 0.270
2017-10-12 3.77 0.270
2017-10-13 2.21 0.270
2017-10-14 0.65 0.270
2017-10-14 23.09 0.270
2017-10-15 21.53 0.270
2017-10-16 19.97 0.270
2017-10-17 18.41 0.270
2017-10-18 16.85 0.270
2017-10-19 15.29 0.270
2017-10-20 13.73 0.270
2017-10-21 12.17 0.270
2017-10-22 10.61 0.270
2017-10-23 9.05 0.270
2017-10-24 7.49 0.270
2017-10-25 5.93 0.270
2017-10-26 4.37 0.270
2017-10-27 2.81 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2017-10- 9 19.73 0.772
2017-10-10 18.17 0.772
2017-10-11 16.61 0.772
2017-10-12 15.05 0.772
2017-10-13 13.49 0.772
2017-10-14 11.93 0.772
2017-10-15 10.37 0.772
2017-10-16 8.81 0.772
2017-10-17 7.25 0.772
2017-10-18 5.69 0.772
2017-10-19 4.13 0.772
2017-10-20 2.57 0.772
2017-10-21 1.01 0.772
2017-10-21 23.45 0.772
2017-10-22 21.89 0.772
2017-10-23 20.33 0.772
2017-10-24 18.77 0.772
2017-10-25 17.21 0.772
2017-10-26 15.65 0.772
2017-10-27 14.09 0.772

Clear Skies, Petr [2017-10-05 06:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on 9/27. Submitted data. [2017-09-29 02:52, Shed of Science] Message sent to observers

· I have observed 10132 Lummelunda last night during 3.5 hours covering eclipse/occultation event, with T90 from Sierra Nevada Observatory. [2017-09-23 07:02, IAO-Isaac Aznar Obs.]

· I will start a run tonight hoping to catch the 0.777event.

Russ [2017-09-21 01:05, Shed of Science] Message sent to observers

· I started a run on this at 02:00 UT, and hope to catch the 0.261 phase event.
Don [2017-09-13 02:22, Sugarloaf]

· Current solution for this new binary:
http://www.asu.cas.cz/~asteroid/10132_porb.png
http://www.asu.cas.cz/~asteroid/10132_p1.png

More data with errors <=0.02 mag are needed before we publish it on CBET. Those for the 0.25-phase event will refine the orbital period, while those for the 0.75-phase event will primarily define the secondary-to-primary size ratio. Event ephemeris for the next lunation:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 9- 9 10.91 0.261
2017- 9-10 9.41 0.261
2017- 9-11 7.91 0.261
2017- 9-12 6.41 0.261
2017- 9-13 4.91 0.261
2017- 9-14 3.41 0.261
2017- 9-15 1.91 0.261
2017- 9-16 0.41 0.261
2017- 9-16 22.91 0.261
2017- 9-17 21.41 0.261
2017- 9-18 19.91 0.261
2017- 9-19 18.41 0.261
2017- 9-20 16.91 0.261
2017- 9-21 15.41 0.261
2017- 9-22 13.91 0.261
2017- 9-23 12.41 0.261
2017- 9-24 10.91 0.261
2017- 9-25 9.41 0.261
2017- 9-26 7.91 0.261
2017- 9-27 6.41 0.261
2017- 9-28 4.91 0.261
2017- 9-29 3.41 0.261
2017- 9-30 1.91 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2017- 9- 9 22.26 0.765
2017- 9-10 20.76 0.765
2017- 9-11 19.26 0.765
2017- 9-12 17.76 0.765
2017- 9-13 16.26 0.765
2017- 9-14 14.76 0.765
2017- 9-15 13.26 0.765
2017- 9-16 11.76 0.765
2017- 9-17 10.26 0.765
2017- 9-18 8.76 0.765
2017- 9-19 7.26 0.765
2017- 9-20 5.76 0.765
2017- 9-21 4.26 0.765
2017- 9-22 2.76 0.765
2017- 9-23 1.26 0.765
2017- 9-23 23.76 0.765
2017- 9-24 22.26 0.765
2017- 9-25 20.76 0.765
2017- 9-26 19.26 0.765
2017- 9-27 17.76 0.765
2017- 9-28 16.26 0.765
2017- 9-29 14.76 0.765
2017- 9-30 13.26 0.765

Clear Skies,

Petr [2017-09-04 12:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Submitted data from Aug 30 around 4UT [2017-09-01 15:40, Shed of Science] Message sent to observers

· I plan to start a run about 20:00 UT, Aug. 31.
Vladimir [2017-08-31 17:48, Sopot AO]

· We have a session performed on Aug. 27, the same first night of Vladimir. I'm sending our data.
Cheers, Alessandro [2017-08-30 07:02, Univ-Siena IT] Message sent to observers

· Vladimir Benishek took two nights for this off-list target from Sopot. His data suggest that it *might* be a binary (but a more complex longer-period lightcurve is also possible). A tentative lc decomposition:
http://www.asu.cas.cz/~asteroid/10132_p1.png
http://www.asu.cas.cz/~asteroid/10132_porb.png
(It's U = 2 for the primary period, and the P_orb is arbitrary of course, set just for plotting purpose.)

Vladimir (and Frederick Pilcher, whom Vladimir asked for help) are going to take more data to establish it. However, he would appreciate if others here could help out. Data with errors < 0.03 mag are needed and long sessions are preferred.

Clear Skies, Petr [2017-08-29 10:34, Ondrejov] Message sent to BinAstPhotSurvey conference

(10721) Tuterov (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique solution, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/10721.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-11-01 12:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one on Oct 28.
Don [2017-10-28 20:00, Sugarloaf]

(23621) 1996 PA (Finished) - binary [Add new note]
· Discovery apparition is over. Petr [2017-11-01 12:46, Ondrejov]

· Our announcement on this one has appeared on CBET 4436, copied here for your convenience.

(23621) 1996 PA
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
J. Oey, Blue Mountains Observatory, Leura, NSW, Australia; P. Pravec, H.
Kucakova, and K. Hornoch, Ondrejov Observatory; V. Benishek, Belgrade
Astronomical Observatory; and A. Marchini, R. Papini, and F. Salvaggio,
Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of
Siena, report that photometric observations obtained with a 0.50-m telescope
at the Sugarloaf Mountain Observatory, a 0.35-m telescope at the Blue
Mountains Observatory, a 0.65-m telescope at the Ondrejov Observatory,
a 0.35-m telescope at the Sopot Observatory in Serbia, and a 0.30-m
telescope at the Astronomical Observatory of the University of Siena during
July 16-Sept. 25 reveal that minor planet (23621), whose orbit crosses that
of Mars, is a binary system with an orbital period of 20.60 Â± 0.03 hr.
The primary shows a period of 2.6649 Â± 0.0005 hr and has a lightcurve
amplitude of 0.07 mag at solar phases 1-4 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.04- to
0.12-magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.27.

2017 October 4 (CBET 4436) Daniel W. E. Green

Julian, for a case you can still take 4-h long sessions centered at predicted event mid-times with errors not greater than 0.02 mag ---don't bother in less optimal conditions---, here is event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017-10- 9 8.12 0.262
2017-10-10 4.72 0.262
2017-10-11 1.32 0.262
2017-10-11 21.92 0.262
2017-10-12 18.52 0.262
2017-10-13 15.12 0.262
2017-10-14 11.72 0.262
2017-10-15 8.32 0.262
2017-10-16 4.92 0.262
2017-10-17 1.52 0.262
2017-10-17 22.12 0.262
2017-10-18 18.72 0.262
2017-10-19 15.32 0.262
2017-10-20 11.92 0.262
2017-10-21 8.52 0.262
2017-10-22 5.12 0.262
2017-10-23 1.72 0.262
2017-10-23 22.32 0.262
2017-10-24 18.92 0.262
2017-10-25 15.52 0.262
2017-10-26 12.12 0.262
2017-10-27 8.72 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2017-10- 9 18.16 0.750
2017-10-10 14.76 0.750
2017-10-11 11.36 0.750
2017-10-12 7.96 0.750
2017-10-13 4.56 0.750
2017-10-14 1.16 0.750
2017-10-14 21.76 0.750
2017-10-15 18.36 0.750
2017-10-16 14.96 0.750
2017-10-17 11.56 0.750
2017-10-18 8.16 0.750
2017-10-19 4.76 0.750
2017-10-20 1.36 0.750
2017-10-20 21.96 0.750
2017-10-21 18.56 0.750
2017-10-22 15.16 0.750
2017-10-23 11.76 0.750
2017-10-24 8.36 0.750
2017-10-25 4.96 0.750
2017-10-26 1.56 0.750
2017-10-26 22.16 0.750
2017-10-27 18.76 0.750

Petr [2017-10-05 05:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· The discovery phase of this new binary Mars crosser is over now, I've just submitted our announcement to CBET. Lc decompositions:
http://www.asu.cas.cz/~asteroid/23621_2017f_porb.png
http://www.asu.cas.cz/~asteroid/23621_2017f_p1.png
http://www.asu.cas.cz/~asteroid/23621_2017e_porb.png
http://www.asu.cas.cz/~asteroid/23621_2017e_p1.png
http://www.asu.cas.cz/~asteroid/23621_2017d_porb.png
http://www.asu.cas.cz/~asteroid/23621_2017d_p1.png
http://www.asu.cas.cz/~asteroid/23621_2017c_porb.png
http://www.asu.cas.cz/~asteroid/23621_2017c_p1.png
http://www.asu.cas.cz/~asteroid/23621_2017b_porb.png
http://www.asu.cas.cz/~asteroid/23621_2017b_p1.png
http://www.asu.cas.cz/~asteroid/23621_2017a_porb.png
http://www.asu.cas.cz/~asteroid/23621_2017a_p1.png

Cheers, Petr [2017-10-01 13:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 09/16,09/17,09/19,09/20 [2017-09-22 06:11, Blue Mountains Obs] Message sent to observers

· observed on 08/25 and long session about 6 hours on 08/26 capturing an event. Porb is 20.6h? [2017-08-27 01:57, Blue Mountains Obs]

· This one was observed on Aug. 03 (22:10-00:58 UT), Aug. 15-16 (21:02-00:26 UT), Aug. 16 (21:04-23:50 UT) and Aug. 17 (21:18-23:54 UT).

Vladimir [2017-08-25 12:36, Sopot AO] Message sent to observers

· observed on 08/22 and 08/23 close to 7 hours on the 23rd. Good condition and looks like an event was captured mid session. [2017-08-25 11:58, Blue Mountains Obs]

· observed on 08/15,08/17,08/19 under good condition and long duration. [2017-08-21 23:00, Blue Mountains Obs] Message sent to observers

· Picking up the baton, I started observing this on 08/13 and 08/14 [2017-08-14 21:05, Blue Mountains Obs]

· This target is now below my southern observing horizon. Since it is a binary suspect, it would be good if someone at a lower latitude could pick it up. Thanks in advance.

Don [2017-08-14 00:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

· The main period appears well determined now (though we cannot rule out that it is a longer period with more maxima/minima per cycle), but no satisfactory solution for a few apparent attenuations there. A tentative decomposition (with P_orb set at an arbitrary value):
http://www.asu.cas.cz/~asteroid/23621_p1.png
http://www.asu.cas.cz/~asteroid/23621_porb.png

More data (long sessions with errors < 0.02 mag) could be still useful.

Clear Skies, Petr [2017-08-03 10:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 02:55 UT.
Don [2017-08-02 01:54, Sugarloaf] Message sent to observers

· I'm planning to start this at 02:55 UT.
Don [2017-08-01 00:59, Sugarloaf]

· Planning to start this one at 02:45 UT.
Don [2017-07-31 01:13, Sugarloaf]

· Started a run on July 30 at 20.00 UT, it will end around 3.00.
Alessandro [2017-07-31 00:22, Univ-Siena IT] Message sent to observers

· Maybe too fast for our diameter, but we tried to observe this target in the last 2 nights (5 hours on July 28, 7 hours on July 29).
Alessandro [2017-07-30 08:31, Univ-Siena IT]

· Planning a run on this at 03:00 UT.
Don [2017-07-30 01:12, Sugarloaf] Message sent to observers

· Don Pray observed this new Mars crosser target from Sugarloaf Mountain on 3 nights (sessions 2-5 hours long). If the 0.10mag-amplitude lightcurve is predominated by the 2nd harmonic, it is a unique period of 2.819 h and there are present attenuations. But it may be also a longer period with more maxima/minima per cycle (and with no attenuations). Given the short summer nights, Don may not be able to resolve it uniquely with his observations only. I encourage others here to help out.

Clear Skies, Petr [2017-07-28 07:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 02:55 UT.
Don [2017-07-26 03:00, Sugarloaf] Message sent to observers

· I've done two runs on this on July 16+17.
Don [2017-07-26 01:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5474) Gingasen (Finished) - probable binary [Add new note]
· Done in the 3rd apparition by Don Pray from Sugarloaf Mountain and by Walt Cooney from Columbus.
http://www.asu.cas.cz/~asteroid/05474_2017_p1.png
http://www.asu.cas.cz/~asteroid/05474_2017_p2.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-10-25 07:04, Ondrejov]

· Started this 23:50, Oct 10 UT.
Don [2017-10-11 00:10, Sugarloaf] Message sent to observers

· Started this one at 01:00 UT.
Don [2017-09-25 01:54, Sugarloaf]

· Started a run on this at 01:45 UT.
Don [2017-09-17 02:09, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Peter's calibration gave H_R = 12.70 +/- 0.2 for assumed G=0.15 +/- 0.2. [2008-04-10 14:05, Ondrejov]

· Five nights by David from Hunters Hill and one night by Peter K. from here have provided following solution:
P_1 = 3.6242 +/- 0.0003 h
P_2 = 3.1095 +/- 0.0009 h
A_1 = 0.18 mag
A_2 = 0.06 mag
The solution for P_2 is unique for assumed bimodal shape of the lightcurve component.
http://www.asu.cas.cz/~asteroid/05474_all.png
http://www.asu.cas.cz/~asteroid/05474_p1.png
http://www.asu.cas.cz/~asteroid/05474_p2.png

Cheers, Petr [2008-03-17 13:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· My observations from last night (+1 new David's session) confirmed and fixed both periods (3.6243 h and 3.1092 h) which are unique now. No mutual events or other deviations seen in data. This target is finished and Petr will close it here on Monday. Peter K. [2008-03-15 10:36, Ondrejov] Message sent to observers

· Observing from 18:40 UT. Sky is OK now but may be worsening later tonight. Peter K. [2008-03-14 18:57, Ondrejov]

· David has observed this one from Hunters Hill on four nights (5.5-7.0 h long). Peter K. has noticed that David's data don't fit well with a single period. I have found that there is present an additional signal with another period and amplitude 0.06 mag. A solution for the second period is not unique yet, two most probable values are 2.920 and 3.107 h. The two lightcurve components of the asteroid may be rotations of two components in a binary system, but as we haven't seen mutual events, it remains only a possible and not a full, regular binary detection. And, of course, we cannot estimate which one of the two periods (3.6237 h with amplitude 0.18 mag and 2.920/3.107 h with amplitude 0.06 mag) belongs to a primary and which belongs to a secondary. We have seen a few other similar cases in past, (2486) Metsahovi, (3982) Kastel, and (114319) 2002 XD58.
http://www.asu.cas.cz/~asteroid/05474_all.png
http://www.asu.cas.cz/~asteroid/05474_p1.png
http://www.asu.cas.cz/~asteroid/05474_p2.png
http://www.asu.cas.cz/~asteroid/05474_p2_nsp.png

We need to take at least one full night from a different longitude (continent) to establish the second period uniquely. Moon will begin to disturb seriously in a few days, so who can please observe it tonight or during a couple following nights. Obviously, we cannot predict whether more observations will bring a detection of mutual events; it may be away from events geometry, or orbital period may be long.

Clear Skies, Petr [2008-03-13 12:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-03-12 from 09:29UT to 16:21UT in good conditions. Data refines the apparent tri peak period to 3.624 +/- 0.001hrs with an amplitude of 0.18 +/- 0.03mag.

Data sent to Peter. [2008-03-12 21:47, HuntersHill] Message sent to observers

· Observed 2008-03-09 in less than ideal conditions due to a brightish star and thin cloud. Data refined the period to 3.626 +/- 0.003 with an amplitude of 0.16 +/- 0.03mag. Data sent to Petr. [2008-03-10 01:41, HuntersHill] Message sent to observers

· Observed 2008-03-07 from 09:43UT to 16:41UT in good conditions. Data a little noisy for this lowish amplitude target with a possible period around 3.2 +/- 0.1 hrs, amplitude 0.16 +/- 0.03mag. [2008-03-08 05:03, HuntersHill] Message sent to BinAstPhotSurvey conference

(4825) Ventura (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04825.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-10-24 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this new target on Oct 19, and am doing a second run Oct 20.
Don [2017-10-20 02:11, Sugarloaf]

(1978) Patrice (Finished) [Add new note]
· This new target was done by Romain Montaigut, Arnaud Leroy and Christophe Gillier from OPERA and by Don Pray from Sugarloaf Mountain: An U = 2+ solution (a quadrumodal lightcurve with period twice as large is not ruled out for the 0.13-mag amplitude), multiple coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01978.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Cheers, Petr [2017-10-19 11:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Assisting with this one tonight and plan to start at 01:45 UT.
Don [2017-10-18 00:02, Sugarloaf]

· We started this new target last night and obtained a good run of 4,6h long. Period is about 5,9h with an amplitude of 0,13mag.

Note that (1245) Calvinia was in the same field of view : we estimate a period of 4,8h and amplitude of 0,3mag on this target.

We plan to observe it again on next nights.

Romain and Christophe [2017-10-11 16:22, OPERA]

(4022) Nonna (Finished) - prime suspect [Add new note]
· Done by Don Pray from Sugarloaf Mountain in this 4th apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-10-14 04:48, Ondrejov]

· I did a run on this Oct 2 UT.
Don [2017-10-02 19:23, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This "prime suspect" (i.e., asteroid with P and A in the range where binaries are frequent) has been observed by Julian Oey from Leura on 4 nights in its current 3rd apparition: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/04022_b6.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian.

Petr [2016-04-11 10:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 04/05, 04/06, 04/08 to obtain a period of 2.59h. Data sent in [2016-04-09 08:06, Blue Mountains Obs] Message sent to observers

· Started new target from 12UT tonight [2016-04-02 12:23, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Insufficient data, closing it for now. [2012-04-02 10:33, Ondrejov]

· Plan to start this returning "prime suspect" at 03:00 UT.
Don [2012-02-21 02:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Well done from Modra in this 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2010-11-19 09:53, Ondrejov]

· Observed on Nov. 5/6, 2010, from 20:01 to 22:44 UT.

Jozef/Stefan [2010-11-06 20:09, Modra] Message sent to observers

· Observed 31/01 ~8 hours in varying sky conditions. Leos [2010-11-02 08:30, Modra]

· A short period observed in 30/31.10. Leos [2010-10-31 13:04, Modra] Message sent to BinAstPhotSurvey conference

· Nice third session data, Adrian. Yes, all the data from the three nights fit entirely with the period 2.5877 +/- 0.0005 h, most rotation phases have been covered 8 times, no deviation seen, other periods don't fit. See
http://www.asu.cas.cz/~asteroid/4022.png
It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work, Adrian!

Cheers, Petr [2006-09-23 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· And I can see the same lightcurve as in previous nights. Adrian [2006-09-23 03:13, Modra]

· After recommendations I decided to cover one more night. Adrian [2006-09-22 21:21, Modra] Message sent to BinAstPhotSurvey conference

· If I'm right, this is a fast rotator with P = 2.59 h and A = 0.06 mag. No clear deviation on my data (two quite long runs with short interruptions). Any special need to hunt for satellite to be more sure of? Adrian [2006-09-22 02:51, Modra] Message sent to BinAstPhotSurvey conference

· Beginning of probably long observation. Yesterday's data indicate quite a short period, but very low amplitude. It's a good candidate for binary, isn't it? Adrian [2006-09-21 19:17, Modra]

· From so many possibilities for tonight I just started this. I will probably try also 2430 later and during two subsequent nights.
Adrian [2006-09-20 19:16, Modra] Message sent to BinAstPhotSurvey conference

(4650) Mori (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on 3 nights: A good U = +2 solution, multiple coverage, no deviation.
http://www.asu.cas.cz/~asteroid/04650.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2017-10-12 07:16, Ondrejov] Message sent to BinAstPhotSurvey conference

(4450) Mori (Finished) [Add new note]
· Note: This asteroid's # is actually 4650, NOT 4450 as listed here.

I started a run on it tonight at 00:00 UT.
Don [2017-10-11 00:08, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this new target at 01:50 UT.
Don [2017-09-29 01:16, Sugarloaf]

(10498) Bobgent (Finished) - probable binary [Add new note]
· Extensive observations by Julian Oey from Leura and Don Pray from Sugarloaf Mountain have revealed that there are two periods present in this one:
http://www.asu.cas.cz/~asteroid/10498_all.png http://www.asu.cas.cz/~asteroid/10498_p1.png http://www.asu.cas.cz/~asteroid/10498_p2.png
It is a probable binary. No prominent attenuations from the 2-period model were detected (though shallow ones might be present, for the relatively high noise especially later in the observational campaign). Higher quality data will be needed to describe it better in future.
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-10-05 12:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 08/25,08/26,08/28,08/29 to get a quad modal light curve p=6.9h from JBL [2017-08-30 13:29, Blue Mountains Obs] Message sent to observers

· Starting this one at 01:40 UT. It's right at my southern limit, but I can still get 3 hours.
Don [2017-08-14 01:30, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray took two short runs for this new target from Sugarloaf Mountain. There are several possible periods, one of them:
http://www.asu.cas.cz/~asteroid/10498.png

Don will not be able to take more data as the asteroid will be too south for him after the Full Moon. I encourage others here to take over. As usual, errors not greater than 0.03 mag are needed.

Clear Skies, Petr [2017-08-03 07:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a first run on this on Aug 1 UT, and plan to observe it again tonight, Aug 2.
Don [2017-08-02 01:57, Sugarloaf]

(1422) Stromgrenia (Finished) [Add new note]
· Don Pray did this one from Sugarloaf Mountain on three nights: Unique period, acceptable coverage, no deviation.
http://www.asu.cas.cz/~asteroid/01422.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2017-09-18 06:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this on Sep 11, and am attempting another run tonight, clouds permitting.
Don [2017-09-12 01:36, Sugarloaf]

(27005) 1998 DR35 (Finished) - slow rotator [Add new note]
· Julian Oey and Don Pray worked this new target from Leura and Sugarloaf Mountain, respectively, and they linked their data sets to a same magnitude system, found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/27005.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work on the tough target guys.

Petr [2017-09-07 10:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 05/24,05/25,05/27,05/28,05/29,05/30,05/31,06/01,06/02
found the period to be 133.0h and 0.8mag amplitude. [2017-06-10 10:45, Blue Mountains Obs] Message sent to observers

· observed 05/16. data sent in. no more reporting until completion of this target. I will continue to observe nightly for the months ahead until it is too faint to observe and then I will send the data through. [2017-05-17 22:37, Blue Mountains Obs] Message sent to observers

· I've taken 3 sessions on this one, April 24, May 4 and May 16.
Don [2017-05-17 13:11, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a new target on 05/06,05/07, 05/15 turned out to be a long period of 80h. [2017-05-17 08:45, Blue Mountains Obs]

(15590) 2000 GH82 (Finished) [Add new note]
· This one is finished.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-09-06 12:57, Ondrejov]

· observed on 06/20,06/21,06/22,06/23,06/24 [2017-06-25 09:10, Blue Mountains Obs] Message sent to observers

· I observed from 21:20 UT to 22:50.
Nelya. [2017-06-16 02:06, Simeiz]

· New data were taken for this binary suspect by Amadeo Aznar and by Peter Kusnirak from here. Peter has captured what appears to be an event (though the coverage of the primary lc needs to be improved, so the interpretation is only tentative for now). A tentative decomposition:
http://www.asu.cas.cz/~asteroid/15590_porb.png
http://www.asu.cas.cz/~asteroid/15590_p1.png
(The orbital period has not been determined; the value in the first plot above was set just for plotting purpose.)

More data (with errors <= 0.02 mag) are needed to nail down this case.

Clear Skies, Petr [2017-06-15 08:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 1.5 hour tonight. Peter K. [2017-06-14 23:28, Ondrejov] Message sent to observers

· Julian Oey has taken first three runs (partial nights) for this new target. A probable solution:
http://www.asu.cas.cz/~asteroid/15590.png
There is a group of 5 decreased points in the second session. A confirmation (with errors not greater than 0.02 mag) is needed. I encourage others here to help out Julian.

Clear Skies, Petr [2017-06-13 07:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 05/29, 05/31,06/01 to obtain a period of 3.7901h [2017-06-10 13:38, Blue Mountains Obs]

(22793) 1999 NW1 (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on 7 nights, revealed it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/22793.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-09-01 11:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've done several runs on this slow rotator, and am doing another tonight starting at 00:50 UT.
Don [2017-08-26 01:01, Sugarloaf]

(6032) Nobel (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on 4 nights: U = 3- solution, sufficient coverage, no deviation.
http://www.asu.cas.cz/~asteroid/06032.png
http://www.asu.cas.cz/~asteroid/06032_nsp.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-09-01 06:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· I Plan to start this at 03:20 UT.
Don [2017-08-26 00:58, Sugarloaf] Message sent to observers

· Did a first run on this Aug 24 UT.
Don [2017-08-24 13:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

(10208) Germanicus (Finished) - binary [Add new note]
· Apparition done. Petr [2017-08-31 13:09, Ondrejov]

· I'll be starting this one at 02:50 UT.
Don [2017-08-02 01:55, Sugarloaf] Message sent to observers

· I'll be starting this one at 02:50 UT.
Don [2017-08-01 01:00, Sugarloaf]

· I plan to start this at 03:00 UT.
Don [2017-07-31 01:17, Sugarloaf]

· I plan to start this at 03:00 UT.
Don [2017-07-30 01:11, Sugarloaf] Message sent to observers

· Observing from 21 UT and should be able to 1:30 UT. Peter K. [2017-07-29 21:37, Ondrejov]

· I plan to start this one at 03:25 UT.
Don [2017-07-26 03:01, Sugarloaf] Message sent to observers

· I did 2 runs on this so far, one on July 16 and the other on July 17.
Don [2017-07-26 01:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Closed for the 2nd apparition --- more thorough work will be needed in the future. Petr [2014-12-02 14:54, Ondrejov]

· Observed on 11/02, 11/13 and 11/17 [2014-11-21 21:33, Blue Mountains Obs] Message sent to observers

· observed on 10/27 and 10/28 for a duration of about 5 and 4 hours respectively starting from 13UT [2014-10-29 01:26, Blue Mountains Obs]

· Observed last night 0145-0850 UT from Prompt Tololo. Joe [2014-10-26 17:19, Dark Sky & PROMPT] Message sent to observers

· We have taken the first short run for this return binary (2nd, i.e., the first post-discovery apparition) from Sierra Nevada. We suspect that most of the 3.3-h long run was actually in an event:
http://www.asu.cas.cz/~asteroid/10208_2014_porb.png
More data are needed to disentangle. As we will be probably busy with other things in the next lunation, we ask you who can work it with sufficient accuracy (errors <= 0.03 mag) to help out. Thank you.

Clear Skies, Petr [2014-10-06 11:06, Ondrejov] Message sent to BinAstPhotSurvey conference

2014 YC15 (Finished) [Add new note]
· Vladimir Benishek did this NEA from Sopot on 4 nights: Unique period, multiple coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/2014yc15.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Petr [2017-08-31 11:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· This NEA was observed on two nights: Aug. 23-24 (20:33-02:11 UT) and Aug. 24-25 (20:37-02:18 UT). P = 5.765 hours was found for period. The lightcurve has an amplitude of 1.01 mag. No deviations were seen.

Vladimir [2017-08-25 12:50, Sopot AO] Message sent to BinAstPhotSurvey conference

(22766) 1999 AE7 (Finished) [Add new note]
· Julian Oey did this new target on 3 nights: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/22766.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-08-31 11:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 07/02, 07/28,07/29 found period of 3.42h [2017-08-08 09:34, Blue Mountains Obs]

(20187) Janapittichova (Finished) [Add new note]
· Object closed.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2017-08-31 09:01, Ondrejov]

· Doing another run on this one starting at 02:05 UT.
Don [2017-07-31 01:19, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 02:10 UT. Hopefully, this will eliminate the aliases.
Don [2017-07-30 01:14, Sugarloaf]

· I observed this new target two nights on 19/20 and 20/21 July.
Vasilij Ch. [2017-07-21 17:46, Kharkiv] Message sent to BinAstPhotSurvey conference

(6522) Aci (Finished) [Add new note]
· Vladimir Benishek did this new target from Sopot on 6 nights: Unique solution, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/06522.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-08-31 08:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed further on Aug. 19 (19:21-22:13 UT). Aug. 21-22 (22:03-02:12 UT), Aug. 22-23 (20:16-02:13 UT).

Vladimir [2017-08-25 12:41, Sopot AO]

· I observed this new target on Aug. 02-03 (20:18-01:45 UT).
Vladimir [2017-08-03 12:13, Sopot AO] Message sent to BinAstPhotSurvey conference

(9865) Akiraohta (Finished) [Add new note]
· Vasilij Chiorny did this new target from Kharkiv: U = 2 solution (it's formally unique, but a period 2 or 3 times longer cannot be ruled out for the low amplitude), multiple coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/09865.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vasilij.

Petr [2017-08-30 12:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on 2/3 Aug and this night 3/4 Aug from 19 UT. Vasilij Ch. [2017-08-03 21:12, Kharkiv] Message sent to observers

· I observed this new target two nights on 25/26 end 26/27 July.
Period about 3 hr. Amplitude 0.11 mag.
Vasilij Ch. [2017-07-28 14:57, Kharkiv] Message sent to BinAstPhotSurvey conference

(16423) 1988 BZ3 (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique period, more than double coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/16423.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-08-30 11:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this on Aug 24 and will do a longer run tonight.
Don [2017-08-26 00:56, Sugarloaf]

(4760) Jia-Xiang (Finished) [Add new note]
· Julian Oey and Roger Groom finished their observations of this new target:
http://www.asu.cas.cz/~asteroid/04760_2017a.png
http://www.asu.cas.cz/~asteroid/04760_2017b.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-08-03 10:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Julian Oey has observed this new target. It may be a fully synchronous binary, though the interpretation is only tentative for the limited data (rather short runs and their suboptimal distribution with significant gaps between the nights). A possible solution:
http://www.asu.cas.cz/~asteroid/04760.png

More data are needed, and Julian would certainly appreciate a help by others. But long runs only will be likely useful; I suggest you don't bother unless you can take at least 5 hours of continuous data.

Clear Skies, Petr [2017-06-14 12:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on 05/27,05/29,05/31,06/03,06/05. Unusual light curve. [2017-06-08 10:05, Blue Mountains Obs]

(4228) Nemiro (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on three nights. Despite the low amplitude, it's formally a unique period of 2.77 h if there are no more than 3 maxima/minima per cycle, but it might be also a longer period with more extrema, hence U = 2.
http://www.asu.cas.cz/~asteroid/04228.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-08-03 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning a run on this starting at 02:55 UT.
Don [2017-08-02 01:59, Sugarloaf]

· Doing a third run on this starting at 03:00 UT.
Don [2017-08-01 01:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target last night (July 30), and plan to run it again tonight starting at 03:05 UT.
Don [2017-07-31 01:15, Sugarloaf]

(20460) Robwhiteley (Finished) - binary suspect [Add new note]
· This new target was observed with good accuracy by Vladimir Benishek from Sopot on six nights and by Peter Kusnirak from here on one night. The main period appears well established (apart from that there may be an ambiguity in the number of maxima/minima per cycle), the second period needs to be established with high quality data in the future.
http://www.asu.cas.cz/~asteroid/20460_all.png
http://www.asu.cas.cz/~asteroid/20460_p1.png
http://www.asu.cas.cz/~asteroid/20460_p2.png
http://www.asu.cas.cz/~asteroid/20460_p2_nsp.png
Object closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-07-20 12:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· I obtained another session on this one last night (July 04-05, 20:56-01:30 UT).
Vladimir [2017-07-05 10:09, Sopot AO] Message sent to observers

· Just started observation of this target and I'm hoping for full-night session (4 hours). Peter K. [2017-07-04 21:11, Ondrejov]

· Vladimir Benishek took four sessions for this new target from Sopot. It appears suspicious; a tentative decomposition:
http://www.asu.cas.cz/~asteroid/20460_p1.png
http://www.asu.cas.cz/~asteroid/20460_p2.png

I encourage others here to help out Vladimir. High quality data (errors < 0.02 mag) are needed and long sessions are preferred.

Clear Skies, Petr [2017-07-02 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

(6009) Yuzuruyoshii (Finished) - prime suspect [Add new note]
· Vladimir Benishek did this return "prime suspect" in its current 3rd apparition for the Survey: Good solution, acceptable coverage, no deviation apparent.
http://www.asu.cas.cz/~asteroid/06009_2017a.png
http://www.asu.cas.cz/~asteroid/06009_2017b.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Petr [2017-07-20 11:41, Ondrejov] Message sent to BinAstPhotSurvey conference

(2353) Hameenlinna (Finished) [Add new note]
· to be deleted. [2017-07-20 10:29, Ondrejov]

(4718) Araki (Finished) - slow rotator [Add new note]
· It is a slow rotator. A second period seen, but its nature unclear.
http://www.asu.cas.cz/~asteroid/04718_p1.png
http://www.asu.cas.cz/~asteroid/04718_p2.png
http://www.asu.cas.cz/~asteroid/04718_p1_nsp.png
http://www.asu.cas.cz/~asteroid/04718_p2_nsp.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-07-11 09:28, Ondrejov]

· continue observation for remaining of March 03/09,03/23,03/28,03/30,03/31 and some more in may but of shorter sessions 05/15,05/16,05/20,05/21,05/23,05/24,05/25 [2017-06-13 08:36, Blue Mountains Obs] Message sent to observers

· continue observation for remaining of March 03/09,03/23,03/28,03/30,03/31 and some more in may but of shorter sessions 05/15,05/16,05/20,05/21,05/23,05/24,05/25 [2017-06-12 13:07, Blue Mountains Obs]

· observed on 03/05, 03/06, 03/07, 03/19 and found this asteroid to have a long period rotation of 45.5h [2017-03-20 11:43, Blue Mountains Obs] Message sent to observers

· Observed 7.3 h last night begin 2017-03-09 17:00 UT. too low amplitude [2017-03-10 10:20, Les Makes]

· observed on 02/26 for 5 hours [2017-02-27 04:00, Blue Mountains Obs] Message sent to observers

· Starting a new target 02/25 16 UT to 21 UT [2017-02-26 00:36, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(35404)1997 YV5 (Finished) [Add new note]
· Julian Oey did this one from Leura: Unique solution, multiple coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/35404_b7.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-07-04 10:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 06/25,06/29,06/30,07/01 [2017-07-01 22:20, Blue Mountains Obs] Message sent to observers

· observed on 06/21 from 13.5 to 20UT [2017-06-24 13:09, Blue Mountains Obs]

· observed on 06/22 and 06/23
bimodal light curve with period of 5.740h [2017-06-24 09:38, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(54355) 2000 KJ33 (Finished) [Add new note]
· Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-07-02 12:36, Ondrejov]

· observed on 05/29,05/30,06/01,06/03,06/23,06/24 of varying length per session. data was not as reliable as previous lunation [2017-06-26 13:58, Blue Mountains Obs] Message sent to observers

· Observed last night (May 30-31, 19:47-23:15 UT).
Vladimir [2017-05-31 11:55, Sopot AO]

· observed last night 05/27 for more than full period of 7 hours. [2017-05-27 22:59, Blue Mountains Obs] Message sent to observers

· observed on 05/16, 05/23, 05/25. [2017-05-26 21:29, Blue Mountains Obs]

· Julian Oey observed this new target on three full and two partial nights around its opposition from 2017-05-05 to 16: An unique period, almost double coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/54355_2017a.png

He resumed its observations yesterday. The lightcurve has changed and there is a suspect attenuation, see following tentative fit:
http://www.asu.cas.cz/~asteroid/54355_2017b.png
http://www.asu.cas.cz/~asteroid/54355_20170525.png

More data are needed to get a double coverage of the period anew and to capture more attenuations. I encourage others here to help out Julian.

Clear Skies, Petr [2017-05-26 11:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 05/16, 05/23, 05/25. [2017-05-26 10:23, Blue Mountains Obs] Message sent to observers

· data taken 05/07,05/15. still missing 0.7-0.8phase [2017-05-17 10:11, Blue Mountains Obs]

· Start a new target. 2 nights obtained 05/05, 05/06 still quite a distance from the moon. Period about 7 h. [2017-05-06 22:24, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(14950) 1996 BE2 (Finished) [Add new note]
· Julian Oey did this return target in its 2nd apparition now.
http://www.asu.cas.cz/~asteroid/14950_2017a.png
http://www.asu.cas.cz/~asteroid/14950_2017b.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-07-02 11:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 06/12,06/13,06/20,06/22,06/23 from BMO [2017-06-24 08:17, Blue Mountains Obs] Message sent to observers

· observed on 05/08,05/16,05/20,05/21 from JBL [2017-06-24 08:15, Blue Mountains Obs]

· Starting new target 05/01 and 05/02 from JBL. [2017-05-04 09:21, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Two attenuations 0.05-0.06 mag deep seen before the ends of two sessions by Don, but not well established,
http://www.asu.cas.cz/~asteroid/14950.png
Closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Needs to be confirmed in future.

Petr [2010-06-25 12:48, Ondrejov]

· Began observing from Prompt 06/04-05/2010 at ~2300 UT. Good conditions. Hope to get 6-7 hours. Joe [2010-06-05 00:24, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt 05/21-22/2010 at ~2310 UT. Good conditions. Hope to get 7 hours. Joe [2010-05-21 23:54, Dark Sky & PROMPT]

· Started a run at 01:25 UT.
Don [2010-05-21 01:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Began observing from Prompt 05/18-19/2010 at ~2315 UT. Excellent conditions. Hope to get 7-8 hours. Joe [2010-05-18 23:30, Dark Sky & PROMPT] Message sent to observers

· Started a run at 02:20 UT.
Don [2010-05-17 02:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don has captured a second attenuation (depth 0.06 mag), see following plot (P_orb is tentative):
http://www.asu.cas.cz/~asteroid/14950_porb.png
http://www.asu.cas.cz/~asteroid/14950_p1.png

More events need to be captured to estimate P_orb, so I encourage all who can to observe it so that we get an extensive coverage.

Clear Skies, Petr [2010-05-14 10:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:45 UT.
Don [2010-05-13 01:52, CarbuncleHill]

· Started a run at 02:10 UT.
Don [2010-05-11 02:07, CarbuncleHill]

· Began observing from Prompt 05/9-10/2010 at ~2315 UT. Excellent conditions. Hope to get 7-8 hours. Joe [2010-05-09 23:20, Dark Sky & PROMPT] Message sent to observers

· Observing this one from 21:40 UT under very good seeing, but threatening clouds. Best wishes, Kamil [2010-05-08 22:32, Ondrejov]

· Observing this one from 20:10 UT under bad seeing and threatening clouds. Best wishes, Kamil [2010-05-06 20:19, Ondrejov] Message sent to observers

· Started a run at 01:15 UT.
Don [2010-04-24 01:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 20 UT. Peter K. [2010-04-23 20:20, Ondrejov] Message sent to observers

· Don has taken two nights and detected an attenuation before the end of the 2nd night that seems to be a mutual event, see following plot (where the data are plotted with an arbitrary long period):
http://www.asu.cas.cz/~asteroid/14950.png

More observations after the full moon are needed to detect more events to confirm the binary nature and derive orbital period; collaboration is encouraged.

Clear Skies, Petr [2010-04-23 09:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 02:00 UT.
Don [2010-04-20 02:08, CarbuncleHill]

· Started at 02:00 UT.
Don [2010-04-15 02:46, CarbuncleHill]

(24410) Juliewalker (Finished) [Add new note]
· Inconclusive result for this one:
http://www.asu.cas.cz/~asteroid/24410.png
Target closed.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2017-06-12 07:24, Ondrejov]

· observed in April 5,7,14,18,20,23,27 and 29 from BMO and JBL1. [2017-05-14 05:32, Blue Mountains Obs] Message sent to observers

· A new target observed 03/31 . Bimodal lightcurve with 3.21 h period. [2017-04-01 03:36, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(9972) Minoruoda (Finished) - binary [Add new note]
· Our announcement on this one has appeared on CBET 4401, copied below for your convenience.

Cheers, Petr

(9972) MINORUODA
W. Cooney, Starry Night Observatory, Columbus, TX, U.S.A.; V. Benishek,
Belgrade Astronomical Observatory; P. Pravec, H. Kucakova, K. Hornoch,
P. Kusnirak, and J. Vrastil, Ondrejov Observatory; J. Gross, Sonoita Research
Observatory, Sonoita, AZ, U.S.A.; D. Terrell, Southwest Research Institute;
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; V.
Chiorny and I. Slyusarev, Kharkiv Observatory; B. Flanagan and B. Pellerin,
Madrona Peak Observatory, Medina, TX, U.S.A.; and R. Montaigut and A. Leroy,
OPERA Observatory, France, report that photometric observations taken with a
0.43-m telescope at the Starry Night Observatory, a 0.35-m telescope at the
Sopot Observatory in Serbia, a 0.65-m telescope at the Ondrejov Observatory,
a 0.50-m telescope at the Sonoita Research Observatory, a 0.50-m telescope at
the Sugarloaf Mountain Observatory, a 0.70-m telescope at the Chuguev station
of the Kharkiv Observatory in Ukraine, a 0.6-m telescope at the Madrona Peak
Observatory, and a 0.20-m telescope at the OPERA Observatory during Feb. 24-
Apr. 30 reveal that minor planet (9972) is a binary system with an orbital
period of 22.89 +/- 0.01 hr. The primary shows a period of 3.4221 +/-
0.0002 hr and has a lightcurve amplitude of 0.11 mag at solar phases 10-14
degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.06- to 0.13-magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.24. The mean absolute R
magnitude in the Cousins system is H_R = 13.68 +/- 0.09, assuming the
phase relation slope parameter G = 0.24 +/- 0.11.

2017 June 5 (CBET 4401) Daniel W. E. Green [2017-06-08 10:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have finished observations of this new binary and we are going to do a CBET announcement. Our data:
http://www.asu.cas.cz/~asteroid/09972_2017c_porb.png
http://www.asu.cas.cz/~asteroid/09972_2017c_p1.png
http://www.asu.cas.cz/~asteroid/09972_2017b_porb.png
http://www.asu.cas.cz/~asteroid/09972_2017b_p1.png
http://www.asu.cas.cz/~asteroid/09972_2017a_porb.png
http://www.asu.cas.cz/~asteroid/09972_2017a_p1.png

Cheers, Petr [2017-05-31 08:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this new binary.
http://www.asu.cas.cz/~asteroid/09972_2017c_porb.png
http://www.asu.cas.cz/~asteroid/09972_2017c_p1.png
http://www.asu.cas.cz/~asteroid/09972_2017b_porb.png
http://www.asu.cas.cz/~asteroid/09972_2017b_p1.png
http://www.asu.cas.cz/~asteroid/09972_2017a_porb.png
http://www.asu.cas.cz/~asteroid/09972_2017a_p1.png
The unusual rapid (and somewhat "chaotic") evolution of the events continues. It would be good to take final data in the upcoming lunation before we publish this one on CBET. Data with errors <= 0.02 mag, both in and outside events, are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 5-14 0.94 0.238
2017- 5-14 23.84 0.238
2017- 5-15 22.74 0.238
2017- 5-16 21.64 0.238
2017- 5-17 20.54 0.238
2017- 5-18 19.44 0.238
2017- 5-19 18.34 0.238
2017- 5-20 17.24 0.238
2017- 5-21 16.14 0.238
2017- 5-22 15.04 0.238
2017- 5-23 13.94 0.238
2017- 5-24 12.84 0.238
2017- 5-25 11.74 0.238
2017- 5-26 10.64 0.238
2017- 5-27 9.54 0.238
2017- 5-28 8.44 0.238
2017- 5-29 7.34 0.238
2017- 5-30 6.24 0.238
2017- 5-31 5.14 0.238

Date/Time UTC (LTc.) Phase
--------------------------
2017- 5-14 12.45 0.740
2017- 5-15 11.35 0.740
2017- 5-16 10.25 0.740
2017- 5-17 9.15 0.740
2017- 5-18 8.05 0.740
2017- 5-19 6.95 0.740
2017- 5-20 5.85 0.740
2017- 5-21 4.75 0.740
2017- 5-22 3.65 0.740
2017- 5-23 2.55 0.740
2017- 5-24 1.45 0.740
2017- 5-25 0.35 0.740
2017- 5-25 23.25 0.740
2017- 5-26 22.15 0.740
2017- 5-27 21.05 0.740
2017- 5-28 19.95 0.740
2017- 5-29 18.85 0.740
2017- 5-30 17.75 0.740

Clear Skies, Petr [2017-05-09 06:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one on 26 April from 18:50 UT to 24:00 UT.
Vasilij Ch. [2017-04-27 00:10, Kharkiv] Message sent to observers

· Our current data for this new binary:
http://www.asu.cas.cz/~asteroid/09972_2017b_porb.png
http://www.asu.cas.cz/~asteroid/09972_2017b_p1.png
http://www.asu.cas.cz/~asteroid/09972_2017a_porb.png
http://www.asu.cas.cz/~asteroid/09972_2017a_p1.png

More data are still needed for both events before we publish it on CBET. Particularly interesting is the apparent rapid (and somewhat "chaotic") evolution of the 0.75-phase event, which we don't understand yet. Data with errors <= 0.02 mag are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 4-14 10.67 0.250
2017- 4-15 9.55 0.250
2017- 4-16 8.44 0.250
2017- 4-17 7.32 0.250
2017- 4-18 6.21 0.250
2017- 4-19 5.09 0.250
2017- 4-20 3.98 0.250
2017- 4-21 2.86 0.250
2017- 4-22 1.75 0.250
2017- 4-23 0.63 0.250
2017- 4-23 23.52 0.250
2017- 4-24 22.40 0.250
2017- 4-25 21.29 0.250
2017- 4-26 20.17 0.250
2017- 4-27 19.06 0.250
2017- 4-28 17.94 0.250
2017- 4-29 16.83 0.250
2017- 4-30 15.71 0.250
2017- 5- 1 14.60 0.250
2017- 5- 2 13.48 0.250
2017- 5- 3 12.37 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2017- 4-14 22.10 0.750
2017- 4-15 20.98 0.750
2017- 4-16 19.87 0.750
2017- 4-17 18.75 0.750
2017- 4-18 17.64 0.750
2017- 4-19 16.52 0.750
2017- 4-20 15.41 0.750
2017- 4-21 14.29 0.750
2017- 4-22 13.18 0.750
2017- 4-23 12.06 0.750
2017- 4-24 10.95 0.750
2017- 4-25 9.83 0.750
2017- 4-26 8.72 0.750
2017- 4-27 7.60 0.750
2017- 4-28 6.49 0.750
2017- 4-29 5.37 0.750
2017- 4-30 4.26 0.750
2017- 5- 1 3.14 0.750
2017- 5- 2 2.03 0.750
2017- 5- 3 0.91 0.750

Clear Skies, Petr [2017-04-07 12:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed outside the events on Mar. 29-30, 18:17-00:27 UT.
Vladimir [2017-03-30 11:39, Sopot AO] Message sent to observers

· I started this one at 01:35 UT and hope to catch the 0.251 phase event.
Don [2017-03-30 01:39, Sugarloaf]

· We started a run on this new binary tonight. We hope to catch the end of the secondary event.
Arnaud and Romain [2017-03-26 20:13, OPERA] Message sent to observers

· Observed on Mar. 23-24, 19:21-03:08 UT.

Vladimir [2017-03-24 16:41, Sopot AO]

· Running from Madrona Peak tonight also. Hasn't started yet. -Walt [2017-03-21 02:04, Sonoita] Message sent to observers

· I started this around 01:00 Mar 20 UT.
Don [2017-03-21 01:10, Sugarloaf]

· I'll be running this again tonight to catch the same event (5.84 UT) as last night. Clouds and wind made for poor conditions last night.
Don [2017-03-17 23:27, Sugarloaf] Message sent to observers

· I'm planning to do a run on this tonight to catch the event at 6.99 UT.

Don [2017-03-16 19:04, Sugarloaf]

· A likely solution for this new binary:
http://www.asu.cas.cz/~asteroid/09972_porb.png
http://www.asu.cas.cz/~asteroid/09972_p1.png

It needs to be nailed down with more data (errors < 0.03 mag needed). Somewhat interesting is the apparent evolution of the events --- more data are needed to get an understanding. Event ephemeris (but don't confine your observations too narrowly around the predicted times):

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-16 19.64 0.251
2017- 3-17 18.49 0.251
2017- 3-18 17.34 0.251
2017- 3-19 16.19 0.251
2017- 3-20 15.04 0.251
2017- 3-21 13.89 0.251
2017- 3-22 12.74 0.251
2017- 3-23 11.59 0.251
2017- 3-24 10.44 0.251
2017- 3-25 9.29 0.251
2017- 3-26 8.14 0.251
2017- 3-27 6.99 0.251
2017- 3-28 5.84 0.251
2017- 3-29 4.69 0.251
2017- 3-30 3.54 0.251
2017- 3-31 2.39 0.251
2017- 4- 1 1.24 0.251
2017- 4- 2 0.09 0.251
2017- 4- 2 22.94 0.251
2017- 4- 3 21.79 0.251
2017- 4- 4 20.64 0.251
2017- 4- 5 19.49 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2017- 3-17 6.99 0.748
2017- 3-18 5.84 0.748
2017- 3-19 4.69 0.748
2017- 3-20 3.54 0.748
2017- 3-21 2.39 0.748
2017- 3-22 1.24 0.748
2017- 3-23 0.09 0.748
2017- 3-23 22.94 0.748
2017- 3-24 21.79 0.748
2017- 3-25 20.64 0.748
2017- 3-26 19.49 0.748
2017- 3-27 18.34 0.748
2017- 3-28 17.19 0.748
2017- 3-29 16.04 0.748
2017- 3-30 14.89 0.748
2017- 3-31 13.74 0.748
2017- 4- 1 12.59 0.748
2017- 4- 2 11.44 0.748
2017- 4- 3 10.29 0.748
2017- 4- 4 9.14 0.748
2017- 4- 5 7.99 0.748
2017- 4- 6 6.84 0.748

Clear Skies, Petr [2017-03-16 11:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work from SRO again tonight. -Walt [2017-03-08 02:53, Sonoita] Message sent to observers

· Will work from SRO tonight. -Walt [2017-03-07 01:15, Sonoita]

· This new target was observed by Vladimir Benishek from Sopot, by Walt Cooney and coll. from Starry Night Observatory and Madrona Peak Observatory, and by Jan Vrastil and Kamil Hornoch from here. There appear deviations that suggest it's a binary.
http://www.asu.cas.cz/~asteroid/09972_p1.png
http://www.asu.cas.cz/~asteroid/09972_porb.png
(No real solution for P_orb yet. The value in the picture above was set just for the plotting purpose.)

More data with errors < 0.03 mag are needed. Long sessions only are going to be useful; don't bother if you cannot take at least a 4-hour run.

Clear Skies, Petr [2017-03-06 12:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Feb. 25-26, 21:05-03:56 UT.
Vladimir [2017-02-26 16:02, Sopot AO]

· I observed this one on Feb. 24, 00:07-03:36 UT.
Vladimir [2017-02-24 14:20, Sopot AO] Message sent to BinAstPhotSurvey conference

(19286) 1996 DU (Finished) [Add new note]
· Vladimir Benishek did this new target from Sopot: Unique period, double coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/19286.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work Vladimir.

Cheers, Petr [2017-05-22 07:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this new target on May 17-18, 20:34-01:52 UT.
Vladimir [2017-05-18 14:09, Sopot AO]

(7509) Gamzatov (Finished) [Add new note]
· Vladimir Benishek did this new target from Sopot on 14 nights, revealed slow rotation. It's a good U = 3 solution, but the coverage is not sufficient to reveal a possible tumbling (so I rate it PAR = 0).
http://www.asu.cas.cz/~asteroid/07509.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Cheers, Petr [2017-05-19 08:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another two sessions on this one obtained on Mar. 22-23, 22:13-03:30 UT and Mar. 23-24, 22:03-03:34 UT.

Vladimir [2017-03-24 16:37, Sopot AO]

· Observed on two nights (March 21, 00:23-03:31 UT and March 21-22, 21:58-03:27 UT).

Vladimir [2017-03-22 15:35, Sopot AO] Message sent to BinAstPhotSurvey conference

(5887) Yauza (Finished) [Add new note]
· Julian Oey did this new target on 15 nights, found it to be a slow rotator:
http://www.asu.cas.cz/~asteroid/05887.png http://www.asu.cas.cz/~asteroid/05887_nsp.png
There are a few features suggesting that it could be a tumbler, but the data are not sufficient to solve for a second period; I rate it PAR = -1.

Petr [2017-05-15 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 02/15,02/16 and 02,17 . Long period >40h [2017-02-19 05:28, Blue Mountains Obs]

(4750) Mukai (Finished) [Add new note]
· Julian Oey observed this new target on 14 nights, found it to be a slow rotator; an U = 2 solution (a few longer periods are also possible):
http://www.asu.cas.cz/~asteroid/04750.png
The fit is not very good, which may be due to a tumbling; we rate it PAR = -1.
Target closed for the BinAstPhotSurvey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Julian on the tough object.

Petr [2017-05-12 12:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 8 nights between 02/19 to 03/29 where the period of 38.3h is found. the erratic nature of the light curve point to the asteroid being a possible tumbler. [2017-04-08 22:55, Blue Mountains Obs] Message sent to observers

· observed on 02/03,02/04,02/05. unable to derive period yet. [2017-02-19 05:36, Blue Mountains Obs]

· start a new target. appears to be a long period [2017-02-05 12:57, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2733) Hamina (Finished) [Add new note]
· Don Pray worked this new target from Sugarloaf Mountain on 13 nights (supported with one night by Vladimir Benishek from Sopot), found it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/02733.png
http://www.asu.cas.cz/~asteroid/02733_nsp.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-05-10 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will run from SRO tonight. -Walt

-Scratch that. Dome problems tonight. -Walt [2017-03-14 01:42, Sonoita] Message sent to observers

· I've done 3 sessions on this, and it appears to be a slow rotator.
Don [2017-02-19 20:59, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5970) Ohdohrikouen (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain, by Vasilij Chiorny from Kharkiv, and by Romain Montaigut and Arnaud Leroy with OPERA: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05970.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-05-09 06:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· I just started a run on it for 4h long.
Romain [2017-04-28 23:07, OPERA] Message sent to observers

· I observed this one on 27/28 April from 20:45 UT to 00:40 UT. Vasilij Ch. [2017-04-28 01:10, Kharkiv]

· I observed this new target last night (April 24, UT). Looks like a fast rotator.
Don [2017-04-24 18:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

(10041) Parkinson (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/10041.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-04-26 07:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this one at 03:00 UT.
Don [2017-04-03 00:43, Sugarloaf]

· Attempting a second night on this, but clouds may prevent it.
DOn [2017-03-24 01:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2881) Meiden (Finished) - binary, probable ternary [Add new note]
· I am posting an information on this off-list target here basically just to log it in. Observations by Tom Polakis and Brian Skiff have revealed it to be a 3-period system (probable ternary), see following decomposition of their data:
http://www.asu.cas.cz/~asteroid/02881_2017a_porb.png
http://www.asu.cas.cz/~asteroid/02881_2017a_p1.png
http://www.asu.cas.cz/~asteroid/02881_2017a_p2.png

It should appear on CBET soon.

For a case someone wished to take follow-up observations, below is an ephemeris for the events. However, take data also outside events, for the rotational lightcurve components. Errors < 0.02 mag are needed; don't bother in sub-optimal conditions.

Date/Time UTC (LTc.) Phase
--------------------------
2017- 4-24 23.51 0.232
2017- 4-25 19.93 0.232
2017- 4-26 16.35 0.232
2017- 4-27 12.77 0.232
2017- 4-28 9.19 0.232
2017- 4-29 5.61 0.232
2017- 4-30 2.03 0.232
2017- 4-30 22.45 0.232
2017- 5- 1 18.87 0.232
2017- 5- 2 15.29 0.232
2017- 5- 3 11.71 0.232
2017- 5- 4 8.13 0.232

Date/Time UTC (LTc.) Phase
--------------------------
2017- 4-24 13.25 0.729
2017- 4-25 9.67 0.729
2017- 4-26 6.09 0.729
2017- 4-27 2.51 0.729
2017- 4-27 22.93 0.729
2017- 4-28 19.35 0.729
2017- 4-29 15.77 0.729
2017- 4-30 12.19 0.729
2017- 5- 1 8.61 0.729
2017- 5- 2 5.03 0.729
2017- 5- 3 1.45 0.729
2017- 5- 3 21.87 0.729

Clear Skies, Petr [2017-04-25 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

(2750) Loviisa (Finished) - slow rotator [Add new note]
· Fred Vachier did this new target with the telescope in Reunion on seven nights (the data linked). Found it to be a slow rotator:
http://www.asu.cas.cz/~asteroid/02750.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-04-12 11:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did 7 runs between 2017-03-16 and 2017-03-23 included [2017-03-23 13:50, Les Makes]

· I did a run on this one on Feb. 23, 00:48-03:56 UT.
Vladimir [2017-02-23 13:04, Sopot AO] Message sent to BinAstPhotSurvey conference

(79472) Chiorny (Finished) [Add new note]
· It was insufficient data for this one, closing the target for this apparition. [2017-04-12 11:48, Ondrejov]

· 4 nights data taken 12/17,12/19,12/26 and 12/27. Possible attenuation on the first night. I may not be able to take anymore data due to bad weather forecast for the next week or so. [2016-12-29 09:03, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(8479) 1987 HD2 (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain on 7 nights and by Vladimir Benishek from Sopot on 2 nights: Good solution, no significant deviation.
http://www.asu.cas.cz/~asteroid/08479_2017a.png
http://www.asu.cas.cz/~asteroid/08479_2017b.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-04-04 14:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:45 UT.
Don [2017-04-03 00:43, Sugarloaf] Message sent to observers

· Another session was obtained on Apr. 01, 18:21-20:59 UT.
Vladimir [2017-04-02 13:02, Sopot AO]

· I also did a run on this one last night (March 31, 18:21-20:55 UT).
Vladimir [2017-04-01 12:35, Sopot AO] Message sent to observers

· Started this one at around 00:00 UT.
Don [2017-03-24 01:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 00:10 UT.
Don [2017-03-21 01:53, Sugarloaf]

· I did a run on this on Mar 5, and started another run tonight at 01:20 UT.
Don [2017-03-06 02:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

(6707) Shigeru (Finished) [Add new note]
· Julian Oey worked this new target from Leura: An U = 2 solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06707.png
http://www.asu.cas.cz/~asteroid/06707_nsp.png

Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Julian on the tough target.

Petr [2017-04-04 07:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 01/28, 01/29, 02/15, and 02/23 [2017-04-01 03:08, Blue Mountains Obs] Message sent to observers

· observed on 02/16. [2017-02-19 05:27, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(6845) Mansurova (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and by Hana Kucakova and Kamil Hornoch from here.
http://www.asu.cas.cz/~asteroid/06845.png
Done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-03-24 07:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hana Kucakova and Kamil Hornoch observed this new target from here on the past night. (Conditions were not ideal for our primary target and this one was a back-up target.) Revealed a longish period:
http://www.asu.cas.cz/~asteroid/06845.png

We plan to take more data to establish it.

Petr [2017-03-17 07:31, Ondrejov] Message sent to BinAstPhotSurvey conference

(6244) Okamoto (Finished) - return binary [Add new note]
· Done in the 3rd apparition. [2017-03-07 13:08, Ondrejov]

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/06244_2016b_porb.png
http://www.asu.cas.cz/~asteroid/06244_2016b_p1.png
http://www.asu.cas.cz/~asteroid/06244_2016a_porb.png
http://www.asu.cas.cz/~asteroid/06244_2016a_p1.png

Last data (errors < 0.02 mag) for this apparition will be useful for modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2-14 9.98 0.255
2017- 2-15 6.30 0.255
2017- 2-16 2.62 0.255
2017- 2-16 22.94 0.255
2017- 2-17 19.26 0.255
2017- 2-18 15.58 0.255
2017- 2-19 11.90 0.255
2017- 2-20 8.22 0.255
2017- 2-21 4.54 0.255
2017- 2-22 0.86 0.255
2017- 2-22 21.18 0.255
2017- 2-23 17.50 0.255
2017- 2-24 13.82 0.255
2017- 2-25 10.14 0.255
2017- 2-26 6.46 0.255
2017- 2-27 2.78 0.255
2017- 2-27 23.10 0.255
2017- 2-28 19.42 0.255
2017- 3- 1 15.74 0.255
2017- 3- 2 12.06 0.255
2017- 3- 3 8.38 0.255
2017- 3- 4 4.70 0.255
2017- 3- 5 1.02 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2-14 20.13 0.755
2017- 2-15 16.45 0.755
2017- 2-16 12.77 0.755
2017- 2-17 9.09 0.755
2017- 2-18 5.41 0.755
2017- 2-19 1.73 0.755
2017- 2-19 22.05 0.755
2017- 2-20 18.37 0.755
2017- 2-21 14.69 0.755
2017- 2-22 11.01 0.755
2017- 2-23 7.33 0.755
2017- 2-24 3.65 0.755
2017- 2-24 23.97 0.755
2017- 2-25 20.29 0.755
2017- 2-26 16.61 0.755
2017- 2-27 12.93 0.755
2017- 2-28 9.25 0.755
2017- 3- 1 5.57 0.755
2017- 3- 2 1.89 0.755
2017- 3- 2 22.21 0.755
2017- 3- 3 18.53 0.755
2017- 3- 4 14.85 0.755
2017- 3- 5 11.17 0.755

Petr [2017-02-06 10:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· This return binary has been observed by Hana Kucakova, Kamil Hornoch and Jan Vrastil from here and by Don Pray from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/06244_2016a_porb.png
http://www.asu.cas.cz/~asteroid/06244_2016a_p1.png

More data (errors < 0.02 mag) are needed for its modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-15 18.82 0.257
2017- 1-16 15.14 0.257
2017- 1-17 11.46 0.257
2017- 1-18 7.78 0.257
2017- 1-19 4.10 0.257
2017- 1-20 0.42 0.257
2017- 1-20 20.74 0.257
2017- 1-21 17.06 0.257
2017- 1-22 13.38 0.257
2017- 1-23 9.70 0.257
2017- 1-24 6.02 0.257
2017- 1-25 2.34 0.257
2017- 1-25 22.66 0.257
2017- 1-26 18.98 0.257
2017- 1-27 15.30 0.257
2017- 1-28 11.62 0.257
2017- 1-29 7.94 0.257
2017- 1-30 4.26 0.257
2017- 1-31 0.58 0.257
2017- 1-31 20.90 0.257
2017- 2- 1 17.22 0.257
2017- 2- 2 13.54 0.257
2017- 2- 3 9.86 0.257
2017- 2- 4 6.18 0.257
2017- 2- 5 2.50 0.257
2017- 2- 5 22.82 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-16 4.99 0.758
2017- 1-17 1.31 0.758
2017- 1-17 21.63 0.758
2017- 1-18 17.95 0.758
2017- 1-19 14.27 0.758
2017- 1-20 10.59 0.758
2017- 1-21 6.91 0.758
2017- 1-22 3.23 0.758
2017- 1-22 23.55 0.758
2017- 1-23 19.87 0.758
2017- 1-24 16.19 0.758
2017- 1-25 12.51 0.758
2017- 1-26 8.83 0.758
2017- 1-27 5.15 0.758
2017- 1-28 1.47 0.758
2017- 1-28 21.79 0.758
2017- 1-29 18.11 0.758
2017- 1-30 14.43 0.758
2017- 1-31 10.75 0.758
2017- 2- 1 7.07 0.758
2017- 2- 2 3.39 0.758
2017- 2- 2 23.71 0.758
2017- 2- 3 20.03 0.758
2017- 2- 4 16.35 0.758
2017- 2- 5 12.67 0.758
2017- 2- 6 8.99 0.758

Clear Skies, Petr [2017-01-11 09:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm starting this at 02:05 UT, and plan to catch the 0.256 phase event.
Don [2017-01-02 01:53, Sugarloaf]

· Started this at 01:50 and hope to catch the 0.756 phase event at 2.88 UT.
Don [2016-12-31 02:19, Sugarloaf] Message sent to observers

· Jan Vrastil, Hana Kucakova and Kamil Hornoch took first two nights for this return binary in its current 3rd apparition, captured a part of one event. (We expect that data taken in this apparition will allow us to get a model of the binary.) I will post plots of the P_1 and P_orb lc components later, but more data (with errors < 0.02 mag) for both events are needed. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-29 20.40 0.256
2016-12-30 16.72 0.256
2016-12-31 13.04 0.256
2017- 1- 1 9.36 0.256
2017- 1- 2 5.68 0.256
2017- 1- 3 2.00 0.256
2017- 1- 3 22.32 0.256
2017- 1- 4 18.64 0.256
2017- 1- 5 14.96 0.256
2017- 1- 6 11.28 0.256
2017- 1- 7 7.60 0.256
2017- 1- 8 3.92 0.256
2017- 1- 9 0.24 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-30 6.56 0.756
2016-12-31 2.88 0.756
2016-12-31 23.20 0.756
2017- 1- 1 19.52 0.756
2017- 1- 2 15.84 0.756
2017- 1- 3 12.16 0.756
2017- 1- 4 8.48 0.756
2017- 1- 5 4.80 0.756
2017- 1- 6 1.12 0.756
2017- 1- 6 21.44 0.756
2017- 1- 7 17.76 0.756
2017- 1- 8 14.08 0.756
2017- 1- 9 10.40 0.756

Clear Skies, Petr [2016-12-29 12:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· This binary has been worked by David Higgins on five nights in its return apparition. Data pretty much in agreement with results from the discovery apparition of 2006. A new feature there is that event depths showed a small variation from night to night. We should see in future if it means something.
http://www.asu.cas.cz/~asteroid/06244_09_porb.png
http://www.asu.cas.cz/~asteroid/06244_09_p1.png

It is closed for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great work, David.

Cheers, Petr [2009-10-01 06:56, Ondrejov] Message sent to observers

· Observed 2009-08-17 from 09:10UT to 18:37UT in good conditions and appear to have caught all of the 0.75 phase (or nearly all of it) [2009-08-17 22:32, HuntersHill]

· Very good data by David Higgins from Aug. 14 and 15; fit pretty well with our results from 2006,
http://www.asu.cas.cz/~asteroid/06244_09_porb.png
http://www.asu.cas.cz/~asteroid/06244_09_p1.png
A coverage of the 0.75-phase event (probably secondary, guessing from comparison with the 2006 data) will be needed to complete this binary for the current apparition. Ephemerides for the events:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 8-17 16.21 0.755
2009- 8-18 12.53 0.755
2009- 8-19 8.85 0.755
2009- 8-20 5.17 0.755
2009- 8-21 1.49 0.755
2009- 8-21 21.81 0.755
2009- 8-22 18.13 0.755
2009- 8-23 14.45 0.755
2009- 8-24 10.77 0.755
2009- 8-25 7.09 0.755
2009- 8-26 3.41 0.755
2009- 8-26 23.73 0.755
2009- 8-27 20.05 0.755
2009- 8-28 16.37 0.755
2009- 8-29 12.69 0.755
2009- 8-30 9.01 0.755

Date/Time UTC (LTc.) Phase
--------------------------
2009- 8-18 2.48 0.260
2009- 8-18 22.80 0.260
2009- 8-19 19.12 0.260
2009- 8-20 15.44 0.260
2009- 8-21 11.76 0.260
2009- 8-22 8.08 0.260
2009- 8-23 4.40 0.260
2009- 8-24 0.72 0.260
2009- 8-24 21.04 0.260
2009- 8-25 17.36 0.260
2009- 8-26 13.68 0.260
2009- 8-27 10.00 0.260
2009- 8-28 6.32 0.260
2009- 8-29 2.64 0.260
2009- 8-29 22.96 0.260
2009- 8-30 19.28 0.260

Clear Skies, Petr [2009-08-17 13:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009-08-15 from 09:54UT to 18:47UT in good conditions. Deviations noted in tonights data as well. Data sent to Petr. [2009-08-16 21:53, HuntersHill] Message sent to observers

· Observed 2009-08-14 from 10:18UT to 18:04UT in fair conditions. Data indicates a period of 2.93 +/- 0.04hrs with an amplitude of 0.15 +/- 0.02mag. Very significant deviations were noted in the second half of the observing period. Data sent to Petr. [2009-08-15 01:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Four nights taken in the third lunation for this one by Don from Carbuncle Hill and by Bob from GMARS indicate a further evolution of the lightcurve, but they didn't provide a satisfactory solution due to their limited coverage of the orbital period.

Petr [2006-12-01 12:05, Ondrejov]

· Got data on November 25 and 26 from GMARS. Data sent to Petr and Peter. [2006-11-27 01:32, Santana] Message sent to BinAstPhotSurvey conference

· Started run at 22:35 ut.
Don [2006-11-20 22:42, CarbuncleHill]

· Don has covered a part of the secondary event on November 18.1. His data are useful (and usable, with errors about 0.02 mag), indicating a further evolution of the binary's lightcurve. Follow up during this week should be useful. If you can work it with errors <0.03 mag, do it. Updated ephemerides for the events are enclosed below, but a coverage outside of the events is needed as well, so don't limit your observations just around the predicted events times.

Date/Time UTC (LTc.) Phase
--------------------------
2006-11-20 6.18 0.255
2006-11-21 2.51 0.255
2006-11-21 22.84 0.255
2006-11-22 19.17 0.255
2006-11-23 15.50 0.255
2006-11-24 11.83 0.255
2006-11-25 8.16 0.255
2006-11-26 4.49 0.255
2006-11-27 0.82 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2006-11-20 16.46 0.760
2006-11-21 12.79 0.760
2006-11-22 9.12 0.760
2006-11-23 5.45 0.760
2006-11-24 1.78 0.760
2006-11-24 22.11 0.760
2006-11-25 18.44 0.760
2006-11-26 14.77 0.760
2006-11-27 11.10 0.760

Cheers, Petr [2006-11-20 17:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at around 23:00 Nov 17 UT, targeting the secondary event at 2.84 UT.
Don [2006-11-17 23:28, CarbuncleHill]

· Fog came too early and ended my run after 20 minutes, no valuable data obtained. Peter K. [2006-11-16 17:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 17:10 UT but fog may be a problem later tonight. I'm planning to cover the primary event. Peter K. [2006-11-16 17:20, Ondrejov]

· Mutual events in this binary evolved fast during 2006 Sept. 26 to Oct. 18. Follow up observations in the upcoming lunation should show a further evolution, such data will be very useful for modeling of the system. Coverage of events plus some phases before and/or after them is needed. Errors <0.03 mag and long sessions are needed, so don't bother in poorer conditions. Ephemerides for the events:

Date/Time UTC (LTc.) Phase
--------------------------
2006-11-10 1.83 0.251
2006-11-10 22.15 0.251
2006-11-11 18.47 0.251
2006-11-12 14.79 0.251
2006-11-13 11.11 0.251
2006-11-14 7.43 0.251
2006-11-15 3.75 0.251
2006-11-16 0.07 0.251
2006-11-16 20.39 0.251
2006-11-17 16.71 0.251
2006-11-18 13.03 0.251
2006-11-19 9.35 0.251
2006-11-20 5.67 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2006-11-10 11.96 0.750
2006-11-11 8.28 0.750
2006-11-12 4.60 0.750
2006-11-13 0.92 0.750
2006-11-13 21.24 0.750
2006-11-14 17.56 0.750
2006-11-15 13.88 0.750
2006-11-16 10.20 0.750
2006-11-17 6.52 0.750
2006-11-18 2.84 0.750
2006-11-18 23.16 0.750
2006-11-19 19.48 0.750
2006-11-20 15.80 0.750 [2006-11-05 10:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our discovery announcement on this binary has appeared on CBET 681. For your convenience, I am copying a text of the circular below. I'll put a note on it on the Survey's page
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
in a few minutes.

Cheers, Petr

(6244) OKAMOTO
D. Higgins, Canberra, Australia; D. Pray, Carbuncle Hill
Observatory, Greene, RI; P. Kusnirak and P. Pravec, Ondrejov
Observatory, report that photometric observations obtained during
Sept. 26-Oct. 17 reveal that minor planet (6244) is a binary system
with an orbital period of 20.32 ± 0.01 hours. The primary rotates
with a period of 2.8958 ± 0.0001 hours, and it has a lightcurve
amplitude of 0.11 mag. Mutual eclipse/occultation events that are
0.07-0.15 mag deep indicate a secondary-to-primary mean-diameter
ratio of 0.25 ± 0.02.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 October 19 (CBET 681) Daniel W. E. Green [2006-10-19 12:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:11UT to 15:43UT in warm and windy conditions. Focus was lost toward the end of the session due to a larger than expected temperature drop overnight.

Data sent to Petr and Peter. [2006-10-18 23:01, HuntersHill] Message sent to BinAstPhotSurvey conference

· A nice solution for the new binary now:
Pprim= 2.8958 +/- 0.0001 h
Porb= 20.32 +/- 0.01 h
Aprim= 0.11 +/- 0.01 mag
Depth of events: 0.07-0.15 mag
Ds/Dp= 0.25 +/-0.02 mag
http://www.asu.cas.cz/~asteroid/06244_all.png
http://www.asu.cas.cz/~asteroid/06244_longpc_a.png
http://www.asu.cas.cz/~asteroid/06244_longpc.png
http://www.asu.cas.cz/~asteroid/06244_shortpc.png
We may call the discovery phase over now. I am going to prepare an announcement for CBET.

Re. follow-up observations for this one: The mutual events in this binary evolve fast, cf. the two plots above of the long period component for the two observational intervals that are about two weeks apart. We expect a further evolution in this binary soon. It wouldn't harm to get follow up data in the last week of this month (unless we are busy with other urgent target at the time). In any case, a follow up in the next lunation will be useful. I will post ephemerides for the events here soon.

Cheers, Petr [2006-10-18 16:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 17:30 UT, the sky is good. Peter K. [2006-10-17 19:43, Ondrejov]

· Observing from 17:40 UT and expecting 7 hours long run covering whole secondary event. Sky is very good now. Peter K. [2006-10-16 18:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Five nights from this lunation were joined in. Two of them were taken by David Higgins (Oct.10 and 11), two from here (11/12 and 14/15) and one by Don Pray (Oct.15). All data are consistent with periods derived in the past lunation and both events are still visible. What we need now is a better coverage of all orbital phases.

Here is an ephemeris for next couple of days (until Oct.20) for better planning of your observations (times in UT).

2006 10 16 22.58 0.750
2006 10 17 8.85 0.255
2006 10 17 18.90 0.750
2006 10 18 5.17 0.255
2006 10 18 15.22 0.750
2006 10 19 1.49 0.255
2006 10 19 11.54 0.750
2006 10 19 21.81 0.255

Don't cover only short events but also parts outside them.

Peter K. [2006-10-16 13:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at around 1:00, Oct 15 UT.
Don [2006-10-15 01:18, CarbuncleHill]

· Observed from 18 UT to 21:15 UT, when the fog stopped me. Covered the primary(?) event, 0.15-mag deep. Peter K. [2006-10-14 23:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 09:36UT to 16:20UT in reasonable conditions. Appeared to have caught an event.

Data sent to Petr and Peter [2006-10-12 01:51, HuntersHill]

· Observing from 17:50 UT in good conditions and expecting 7 hours long run. Peter K. [2006-10-11 21:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 09:40UT to 16:20UT in average conditions.

Data sent to Petr [2006-10-10 22:44, HuntersHill]

· Observed from 09:59UT to 16:57UT in average conditions, damp air and a bright moon. Data is correspondingly noisier but should be usable.

Data sent to Petr and Peter for analysis. [2006-10-03 21:53, HuntersHill] Message sent to BinAstPhotSurvey conference

· Nice work on this new binary!
Pprim= 2.8953 +/- 0.0004 h (but see below)
Porb= 20.32 +/- 0.02 h
Aprim= 0.10 mag
Ds/Dp= 0.25 (preliminary)
http://www.asu.cas.cz/~asteroid/06244_all.png
http://www.asu.cas.cz/~asteroid/06244_shortpc.png
http://www.asu.cas.cz/~asteroid/06244_longpc.png

A coverage of the events as well as some phases outside of them needs to be completed. A few good long sessions with errors about 0.01 mag when the Moon doesn't disturb should finish the discovery phase for this one.

One interesting thing there is that the short period lightcurve component has little signal in odd harmonics for the period of 2.8953 h. In other words, a half period (1.4477 h) fits as well. So, it is formally a double solution for Pprim. The half period is less plausible physically (it would be a unique case with a cohessive, or a high density, primary, that has not been observed for asteroids of its size so far) but it would be nice to eliminate the ambiguity by direct observations. High quality data with errors of 0.01 mag or smaller and with a dense coverage outside of the events will be needed to eliminate the ambiguity.

Clear Skies,

Petr [2006-10-02 16:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· David's latest data fall in between events and refined P_rot as well as confirmed our P_orb estimate. They fit well with P_rot = 2.8952 +/- 0.0003 h.

Pictures linked in my previous message were updated.

Peter K. [2006-10-02 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from Oct01 09:46UT to 15:41UT in very good conditions but the session was cut short by a very large band of cloud.

Data sent to Petr and Peter for analysis. [2006-10-02 01:03, HuntersHill] Message sent to BinAstPhotSurvey conference

· This asteroid was observed between Sept.25 and 30 (4 sessions by Don Pray, three by David Higgins and one by me). One of Don's nights was degraded by near 4-mag star and not used in current solution. These observations revealed that 6244 is a binary asteroid with the short period component of 2.894 h (unique now) and orbital period of 20.35 h (probably). Observed attenuations are 0.06-0.07 mag deep.

http://www.asu.cas.cz/~asteroid/06244_all.png
http://www.asu.cas.cz/~asteroid/06244_shortpc.png
http://www.asu.cas.cz/~asteroid/06244_longpc.png

Here is an ephemeris for next 48 hours:

Date/Time UTC (LTc.) Phas
--------------------------
2006-10-02 3.05 0.240
2006-10-02 13.48 0.753
2006-10-02 23.40 0.240
2006-10-03 9.83 0.753
2006-10-03 19.75 0.240

Petr will look on data in more detail tomorrow and write if its discovery phase is already finished or not.

Peter K. [2006-10-01 17:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 09:56UT to 17:06UT in good conditions. One interferring star ( a magnitude or so brighter than the target) but I ignored the images around it.

A period of 2.899 +/- 0.002 now derived with some "noise". [2006-10-01 01:19, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observing from 18:30 UT, Sep.30, under less then perfect conditions. Peter K. [2006-09-30 20:10, Ondrejov]

· Observed from 09:57UT to 17:06UT in good conditions. Low amplitude target but a period of 5.909 +/- 0.005 hrs with an amplitude of 0.1 +/- 0.01mag stands out. [2006-09-30 02:49, HuntersHill] Message sent to BinAstPhotSurvey conference

· Skipped target tonight due to a mag 4 field star in image frame [2006-09-27 22:43, HuntersHill]

· Observed from 11:03UT to 17:13UT (26th) in reasonable conditions. Several dips and peaks over the duration of the session with an amplitude of 0.12 +/- 0.01mag. No period stands out yet. [2006-09-27 01:58, HuntersHill] Message sent to BinAstPhotSurvey conference

· I'll be starting this around 02:00, Sept 27UT.
Don [2006-09-26 23:18, CarbuncleHill]

(3983) Sakiko (Finished) [Add new note]
· Another new target done by Don Pray from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/03983.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-03-07 07:46, Ondrejov] Message sent to BinAstPhotSurvey conference

(13727) 1998 QU90 (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on three nights: Unique period, multiple coverage, no deviation.
http://www.asu.cas.cz/~asteroid/13727.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2017-03-07 07:22, Ondrejov] Message sent to BinAstPhotSurvey conference

(10182) Junkobiwaki (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on three nights: U = 2+ solution, multiple coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/10182.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-03-04 08:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:20 UT.
Don [2017-03-03 01:48, Sugarloaf]

· I started this one at 01:45 UT.
Don [2017-02-27 02:59, Sugarloaf]

· I observed this new target on Feb 21 UT.
Don [2017-02-22 01:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

(6170) Levasseur (Finished) - prime suspect [Add new note]
· Don's data showed that the suspect drop in the Vladimir's data were just an artifact (probably due to the bright moon). The period was covered three times, no deviation seen. Target closed now.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-02-23 14:33, Ondrejov]

· Planning to observe this starting at 02:50 UT.
Don [2017-02-21 01:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek took a 6.8-h long run for this return "prime suspect". There is apparent a short 0.05-mag deep decrease:
http://www.asu.cas.cz/~asteroid/06170_20170217.png
Confirmation is needed (with errors of 0.01 mag).

Clear Skies, Petr [2017-02-20 15:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this "prime suspect" on Feb. 16-17, 21:03-03:55 UT.
Vladimir [2017-02-17 16:30, Sopot AO]

· Done in 2nd apparition by David from Hunters Hill (2 and half nights) and from SRO (one shorter session): Period in agreement with the 2005 estimate, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/06170_b0.png
Target closed for the apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2010-05-13 11:10, Ondrejov]

· Starting from SRO tonight. -Walt [2010-04-11 02:06, Sonoita] Message sent to BinAstPhotSurvey conference

· Data of 2005-12-04.8 by Marek Husarik from Skalnate Pleso joined in. They fit nicely with the three Don's nights, no significant deviation from the single periodicity seen. The Survey's page (and the linked summary file) updated accordingly:
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-12-06 15:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been finished by Don Pray from Carbuncle Hill. A unique period derived, no deviation seen, well done for the Survey. Put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don. Fast and clean determination.

Cheers, Petr [2005-12-05 17:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Getting a first look at this. Got a late start due to clouds and wind. [2005-12-03 02:55, CarbuncleHill]

(3996) Fugaku (Finished) [Add new note]
· This new target was done by Romain Montaigut and Arnaud Leroy with OPERA and by Don Pray from Sugarloaf Mountain: Unique period, double coverage, no deviation.
http://www.asu.cas.cz/~asteroid/03996.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice, fast work guys.

Cheers, Petr [2017-02-21 10:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a run on this one on Feb 20 UT.
Don [2017-02-20 21:31, Sugarloaf]

· We observed this new target on Feb. 17-18 and Feb. 18-19 UT.
The period seems close to 7.2h with an amplitude of 0.5mag.

Romain and Arnaud [2017-02-20 12:36, OPERA] Message sent to BinAstPhotSurvey conference

(8213) 1995 FE (Finished) - prime suspect [Add new note]
· Don Pray did this return "prime suspect" from Sugarloaf Mountain: Sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/08213_b7.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-02-20 04:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been well done by Don Pray from Carbuncle Hill (3 nights) and by Stefan Gajdos from Modra (1 night). Unique solution, double coverage, no deviation seen. A note on it put on
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don and Stefan.

Cheers, Petr [2006-03-22 09:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Selected shortly before Petr's new target list was issued, I've observed it on three nights. The period seems close to 2.9h, with amplitude a little under .4m. No event seen. If anyone in Europe of the western USA could do a single, long run, it could be finished.

Don [2006-03-20 17:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4072) Yayoi (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04072.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-02-19 16:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this new target on Feb 4.
Don [2017-02-05 02:56, Sugarloaf]

(1899) Crommelin (Finished) [Add new note]
· Vladimir Benishek did this new target from Sopot: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01899_2017a.png
http://www.asu.cas.cz/~asteroid/01899_2017b.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-02-16 15:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Jan. 28-29, 21:11-01:10 UT.
Vladimir [2017-01-29 13:55, Sopot AO]

· This new target was observed on Jan. 22-23 and Jan. 26-27 UT.
Vladimir [2017-01-27 11:29, Sopot AO] Message sent to BinAstPhotSurvey conference

(31170) 1997 WO58 (Finished) [Add new note]
· Julian Oey observed this new target from Leura on 16 nights, but unfortunately his (mostly) short nightly runs turned out insufficient for solving this case. There might be more than one period present, but solving it would require taking full night runs (which was probably not possible for Julian due to recent problematic weather on his site and possibly his other higher priority targets). An U = 1 solution put to
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2017-02-14 12:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 12/26 [2016-12-31 02:05, Blue Mountains Obs] Message sent to observers

· observed on 12/12,12/20, and 12/24 showing period of >50h [2016-12-25 06:30, Blue Mountains Obs]

· starting a new target on 12/09. It appeared to be long period. [2016-12-10 04:34, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(27675) 1981 CH (Finished) - return binary [Add new note]
· Our announcement on this one has appeared on CBET 4361, copied below for your convenience.

Cheers, Petr

(27675) 1981 CH
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, H. Kucakova, K. Hornoch, P. Kusnirak and J. Vrastil, Ondrejov
Observatory; A. Carbognani, Astronomical Observatory of the Aosta Valley
Autonomous Region, Italy; A. Aznar, Isaac Aznar Observatory, Centro
Astronomico del Alto Turia, Aras de los Olmos, Spain; V. Benishek, Belgrade
Astronomical Observatory; W. Cooney and J. Gross, Sonoita Research
Observatory, Sonoita, AZ, U.S.A.; D. Terrell, Southwest Research Institute;
and R. Montaigut and A. Leroy, OPERA Observatory, France, report that
photometric observations taken with a 0.50-m telescope at the Sugarloaf
Mountain Observatory, a 0.65-m telescope at the Ondrejov Observatory, a
0.81-m telescope at the Observatory of the Aosta Valley Autonomous Region,
a 0.35-m telescope at the Isaac Aznar Observatory, a 0.35-m telescope at the
Sopot Observatory in Serbia, a 0.50-m telescope at the Sonoita Research
Observatory, and a 0.20-m telescope at the OPERA Observatory during 2016 Dec.
21-2017 Feb. 1 reveal that minor planet (27675) is a binary system with an
orbital period of 120.1 Â± 0.4 hr. The primary shows a period of 2.9661 Â±
0.0004 hr and has a lightcurve amplitude of 0.11 mag at solar phases 9-13
degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.04- to 0.06-magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.20.

2017 February 14 (CBET 4361) Daniel W. E. Green [2017-02-14 07:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our extensive effort has led to resolving this case. We captured fully or partially three primary events (depth 0.06 mag) on 2016-12-21, 26 and 2017-01-30 and three secondary events (depth 0.04 mag) on 2017-01-17, 27 and 02-01 (plus a marginal detection on 2016-12-29). We have got an unique orbital period of 120.1 +/- 0.4 h; other periods are ruled out by sessions that showed no events. Lc decomposition:
http://www.asu.cas.cz/~asteroid/27675_2017a_porb.png
http://www.asu.cas.cz/~asteroid/27675_2017a_p1.png
http://www.asu.cas.cz/~asteroid/27675_2017b_porb.png
http://www.asu.cas.cz/~asteroid/27675_2017b_p1.png

We will submit our binary discovery announcement to CBET soon.

Cheers, Petr [2017-02-08 10:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current data for this one favor the 120-hour orbital period. (I'll post lc decomposition plots later.) We should try to confirm it. Event ephemeris for the preferred solution is below. Please try to cover them (but don't confine your observations just to the predicted times; the solution is not very secure yet). Data with errors not greater than 0.02 mag are needed.

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-30 11.5 0.249
2017- 2- 4 11.7 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2017- 2- 1 21.2 0.729
2017- 2- 6 21.4 0.729

Clear Skies, Petr [2017-01-28 11:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night (Jan. 20-21, 17:03-03:11 UT).
Vladimir [2017-01-21 12:35, Sopot AO] Message sent to observers

· Started a long run at 17:45 UT of this night.
Albino [2017-01-21 02:43, OAVdA (B04)]

· Starting a long run from 20:10 UT. Best wishes, Kamil and Jan, Ondrejov [2017-01-18 20:05, Ondrejov] Message sent to observers

· Started a long run at 18:50 UT.
Albino [2017-01-17 20:35, OAVdA (B04)]

· Started a run at 18:21 UT.
Albino [2017-01-16 18:56, OAVdA (B04)]

· I started this one at 00:10 UT.
Don [2017-01-16 01:00, Sugarloaf] Message sent to observers

· This one has been observed by Don Pray from Sugarloaf Mountain, by Vladimir Benishek from Sopot, by Romain Montaigut and Arnaud Leroy from OPERA, by Hana Kucakova and Kamil Hornoch from here, and by Amadeo Aznar. There were two 0.06-mag deep attenuations on 2016-12-21 and 26 (and a couple other possible shallow ones on other nights). Orbital period is not unique yet; one possible solution:
http://www.asu.cas.cz/~asteroid/27675_porb.png
http://www.asu.cas.cz/~asteroid/27675_p1.png

We need more data. Long sessions and errors not greater than 0.02 mag are needed; don't bother in sub-optimal conditions.

Clear Skies, Petr [2017-01-11 10:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one at 01:10 UT.
Don [2017-01-09 01:36, Sugarloaf] Message sent to observers

· I started this at 01:15 UT in variable conditions.
Don [2017-01-07 02:16, Sugarloaf]

· Started this one at 01:50 UT.
Don [2017-01-02 01:51, Sugarloaf]

· I started this one at 01:55 UT.
Don [2016-12-31 02:16, Sugarloaf] Message sent to observers

· Observed last night from OPERA (run of 7hours).
Romain [2016-12-29 22:02, OPERA]

· Don Pray observed two events in his three (semi-)long nights for this new target. No solution for the orbital period yet, more data are needed. I encourage others here to help out Don.

Clear Skies, Petr [2016-12-28 13:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this one at 03:00 UT.
Don [2016-12-26 01:09, Sugarloaf]

· I did sessions on this new target on Dec 21 and Dec 23.
Don [2016-12-23 22:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2486) Metsahovi (Finished) - Fully asynchronous binary [Add new note]
· Our announcement on this one has appeared on CBET 4356, copied below for your convenience.

Cheers, Petr

(2486) METSAHOVI
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, H. Kucakova, K. Hornoch and P. Kusnirak, Ondrejov Observatory;
W. Cooney and J. Gross, Sonoita Research Observatory, Sonoita, AZ, U.S.A.;
D. Terrell, Southwest Research Institute; and N. Gaftonyuk, Crimean
Astrophysical Observatory, report that photometric observations taken with a
0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.65-m telescope
at the Ondrejov Observatory, a 0.50-m telescope at the Sonoita Research
Observatory, and a 1.0-m telescope at the Crimean Astrophysical Observatory
during 2016 Nov. 1-Dec. 29 reveal that minor planet (2486) is a binary
system with an orbital period 172.6 Â± 0.2 hr. The minor planet was
suspected to be a binary system from photometric observations taken from
2006 to 2014 (see CBET 860; Pravec et al. 2016, Icarus 267, 267) that
showed the presence of two additive rotational lightcurves. The two
rotational lightcurves are present also in the 2016 data, and they have
periods of 4.4521 Â± 0.0001 and 2.64040 Â± 0.00005 hours and amplitudes
of 0.11 and 0.03 mag, respectively. There are superimposed
eclipse/occultation events that are 0.08- to 0.12-magnitude deep,
indicating a lower limit on the secondary-to-primary mean-diameter ratio
of 0.28. The mean absolute R magnitude in the Cousins system is
H_R = 12.39 Â± 0.04, with the phase relation slope parameter
G = 0.41 Â± 0.05.

2017 February 9 (CBET 4356) Daniel W. E. Green [2017-02-09 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Additional observations by Hana Kucakova and Kamil Hornoch have confirmed and nailed down the orbital period 172.6 h (and ruled out the half period). Current decomposition:
http://www.asu.cas.cz/~asteroid/02486_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02486_2016a_p2.png
http://www.asu.cas.cz/~asteroid/02486_2016a_porb.png

Last data (before we publish this on CBET) would be useful; event ephemeris is below. Long runs with errors < 0.03 mag are needed (but don't confine your observations too narrowly about the predicted mid-event times, the lightcurve may evolve.)

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-18 7.6 0.243
2017- 1-25 12.2 0.243
2017- 2- 1 16.8 0.243

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-22 1.2 0.762
2017- 1-29 5.8 0.762

Clear Skies, Petr [2017-01-10 10:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hana Kucakova and Kamil Hornoch covered a ~half of the 0.75-phase event. The orbital period is refined to 172.7 h or half that. Current decomposition:
http://www.asu.cas.cz/~asteroid/02486_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02486_2016a_p2.png
http://www.asu.cas.cz/~asteroid/02486_2016a_porb.png

Following event ephemeris is for the 172.7-h orbital period. Long runs with errors <= 0.03 mag taken around those times are needed (but don't confine your observations too narrowly about the predicted mid-event times, the lightcurve may evolve.)

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-20 13.7 0.243
2016-12-27 18.4 0.243
2017- 1- 3 23.1 0.243

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 2.6 0.762
2016-12-24 7.3 0.762
2016-12-31 12.0 0.762

However, we also need to check the possible half period with covering the missing gap around orbital phase 0.54:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-22 17.2 0.541
2016-12-29 21.9 0.541
2017- 1- 6 2.6 0.541

Clear Skies, Petr [2016-12-09 10:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray captured another event on the past night. This is likely P_orb of 173 hours, but a half period cannot be entirely ruled out yet.
http://www.asu.cas.cz/~asteroid/02486_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02486_2016a_p2.png
http://www.asu.cas.cz/~asteroid/02486_2016a_porb.png

Following event ephemeris is for the 173-hour orbital period. Long runs with errors <= 0.03 mag taken around those times are needed (but don't confine your observations too narrowly about the predicted mid-event times, the P_orb value is still not quite accurate).

Date/Time UTC (LTc.) Phase
--------------------------
2016-12- 6 4.5 0.242
2016-12-13 9.3 0.242
2016-12-20 14.1 0.242
2016-12-27 18.9 0.242
2017- 1- 3 23.7 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2016-12- 2 17.3 0.761
2016-12- 9 22.1 0.761
2016-12-17 2.9 0.761
2016-12-24 7.7 0.761
2016-12-31 12.5 0.761

However, we should also eliminate the possible half period with covering the missing gap around orbital phase 0.54:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12- 1 2.8 0.538
2016-12- 8 7.6 0.538
2016-12-15 12.4 0.538
2016-12-22 17.2 0.538
2016-12-29 22.0 0.538
2017- 1- 6 2.8 0.538

Clear Skies, Petr [2016-11-30 06:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work from SRO tonight. -Walt [2016-11-30 01:04, Sonoita] Message sent to observers

· Extensive observations by Don Pray from Sugarloaf Mountain, by Walt Cooney and coll. from SRO, and by Nelya Gaftonyuk from Simeiz: The orbital period is about 87 h or twice that.
http://www.asu.cas.cz/~asteroid/02486_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02486_2016a_p2.png
http://www.asu.cas.cz/~asteroid/02486_2016a_porb.png

The P_orb solution is still too uncertain to give an event ephemeris. Please just observe and we will see; we need to capture more events, but also data outside events are useful for eliminating spurious solutions. Photometric errors <= 0.03 mag are needed and long sessions are preferred.

Clear Skies, Petr [2016-11-29 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:20 UT.
Don [2016-11-28 00:31, Sugarloaf] Message sent to observers

· Started this at 02:25 UT.
Don [2016-11-27 02:28, Sugarloaf]

· Will work from SRO again tonight. -Walt [2016-11-25 03:09, Sonoita]

· Will work from SRO again tonight. -Walt [2016-11-23 23:37, Sonoita] Message sent to observers

· Will work from SRO tonight. -Walt [2016-11-23 03:11, Sonoita]

· Started a run on this at 00:10 UT.
Don [2016-11-19 01:29, Sugarloaf]

· I started this one at 00:15 UT.
Don [2016-11-18 00:54, Sugarloaf] Message sent to observers

· Probably can't run from SRO tonight. Looks like some clouds coming in on the satellite shot. -Walt [2016-11-12 21:27, Sonoita]

· Will run from SRO again tonight. -Walt [2016-11-12 02:22, Sonoita] Message sent to observers

· Additional data by Don Pray from Sugarloaf Mountain and by Walt Cooney from SRO joined in. Don has captured another event. The orbital period is about 60, 90, or 180 hours, assuming low eccentricity, but other values are also possible if eccentricity is not small.
http://www.asu.cas.cz/~asteroid/02486_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02486_2016a_p2.png
http://www.asu.cas.cz/~asteroid/02486_2016a_porb.png

We need to capture more events to resolve. Photometric errors <= 0.03 mag are needed and long sessions are preferred.

Clear Skies, Petr [2016-11-11 18:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work again from SRO tonight. -Walt [2016-11-10 01:24, Sonoita] Message sent to observers

· Will work from SRO tonight. -Walt [2016-11-09 00:31, Sonoita]

· Don Pray has taken first three nights for this fully asynchronous binary (see Pravec et al., 2016, Icarus 267, 267â€“295) in its current apparition. In its previous three apparitions we have not captured an event, we saw just the two rotational lightcurve components. But Don captured an event on the last night! A decomposition of his data:
http://www.asu.cas.cz/~asteroid/02486_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02486_2016a_p2.png
http://www.asu.cas.cz/~asteroid/02486_2016a_porb.png
(The orbital period has not been determined of course, it's an arbitrary value set just for plotting purpose in the last picture above.)

We need to capture more events to derive orbital period. I encourage others here to collaborate. Photometric errors <= 0.03 mag and a minimum session duration of 2 hours are needed.

Clear Skies, Petr [2016-11-08 01:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this at 01:10 UT.
Don [2016-11-08 01:06, Sugarloaf] Message sent to observers

· I started this one at 01:15 UT.
Don [2016-11-07 03:26, Sugarloaf]

· I did a second session on this on Nov 5 UT.
Don [2016-11-05 20:29, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This object has been worked by Don Pray from Sugarloaf Mountain and by Walt Cooney, John Gross and Dirk Terrell from SRO in its current 3rd apparition: The two lightcurve components are well resolved again, but still no mutual events:
http://www.asu.cas.cz/~asteroid/02486_14_p1.png
http://www.asu.cas.cz/~asteroid/02486_14_p2.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good, clean work guys.

Cheers, Petr [2014-01-09 10:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working from SRO tonight. [2014-01-07 03:11, Sonoita] Message sent to observers

· I plan to start a run on this at 03:30 UT, clouds permitting.
Don [2014-01-05 00:24, Sugarloaf]

· I plan to start this at 03:30 UT.
Don [2014-01-04 01:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This probable binary has been done in this 2nd apparition by Peter K. from here, by Russ from Shed of Science, and by Walt, John and Dirk from SRO. Like in the 2006-7 apparition, there have been present two additive lightcurve components, P_1 = 4.4524 h, A_1 = 0.11 mag and P_2 = 2.6400 h, A_2 = 0.03 mag, but no obvious events. So, it remains a probable binary, but inconclusive as for most parameters. Lightcurve components of this apparition:
http://www.asu.cas.cz/~asteroid/02486_09_all.png
http://www.asu.cas.cz/~asteroid/02486_09_p1.png
http://www.asu.cas.cz/~asteroid/02486_09_p2.png
cf. with those of the 1st apparition:
http://www.asu.cas.cz/~asteroid/2486_06dec_all.png
http://www.asu.cas.cz/~asteroid/2486_06dec_longpc.png
http://www.asu.cas.cz/~asteroid/2486_06dec_shortpc.png
http://www.asu.cas.cz/~asteroid/2486_07jan_all.png
http://www.asu.cas.cz/~asteroid/2486_07jan_longpc.png
http://www.asu.cas.cz/~asteroid/2486_07jan_shortpc.png

The target is closed for the Survey now, a note with the link to summary data put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-12-18 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to follow this starting at 1UT tonight (11/17) running until 8UT.

Russ [2009-11-16 21:16, Shed of Science] Message sent to observers

· Starting at 3UT. Should be able to follow until 8UT.

Russ [2009-11-16 03:06, Shed of Science]

· I will be starting at about 1UT under good conditions. Hope to follow it until about 8UT or so.

Russ [2009-11-14 23:28, Shed of Science] Message sent to observers

· Starting on this one again at 1:20UT in improving conditions. Should be able to go until about 10:20UT.

Russ [2009-11-10 01:18, Shed of Science]

· Will be ending at about 4UT due to clouds.

Russ [2009-11-08 03:40, Shed of Science] Message sent to observers

· Working this one tonight but it may be only a short run due to clouds.

Russ [2009-11-08 00:52, Shed of Science]

· Started observing at 1:15UT tonight. Russ [2009-11-05 01:16, Shed of Science] Message sent to observers

· Working from SRO tonight. -Walt [2009-10-30 02:38, Sonoita]

· Observing from 18 UT. Peter K. [2009-10-19 18:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement on the probable binary has appeared on CBET 860. A note on it put to our web pages, and I am also copying the text of the circular below for your convenience.

Cheers, Petr

(2486) METSAHOVI
M. Pikler, M. Husarik, and G. Cervak, Skalnate Pleso Observatory; W.
Cooney, J. Gross, and D. Terrell, Sonoita Research Observatory, Sonoita,
AZ; P. Pravec and P. Kusnirak, Ondrejov Observatory; A. Galad, J. Vilagi,
L. Kornos, and S. Gajdos, Modra Observatory; V. Reddy, Department of Earth
System Science and Policy, University of North Dakota, Grand Forks; and R.
Dyvig, Quinn, SD, report that photometric observations obtained during 2006
Dec. 12 to 2007 Jan. 26 reveal that (2486) has a lightcurve consisting of
two linearly additive components with periods 4.4518 and 2.6404 hr and
amplitudes 0.12 and 0.04 mag, respectively. No attenuations due to
occultations/eclipses were seen, so the proposed interpretation of binary
nature of the minor planet needs to be confirmed with further observations.
The mean absolute R magnitude in the Cousins system is 12.14 ± 0.2,
assuming G = 0.15 ± 0.2.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2007 CBAT
2007 February 26 (CBET 860) Daniel W. E. Green [2007-02-27 08:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· This probable binary was observed by Stefan, Jozef, and Adrian from Modra on four nights 2007 Jan. 15.9-26.8, and by Walt, John, and Dirk from Sonoita on night of 2007 Jan. 26.3. The additive two-periodic character with periods within error bars the same as in December is seen again in the January data, but no events again, see
http://www.asu.cas.cz/~asteroid/2486_07jan_all.png
http://www.asu.cas.cz/~asteroid/2486_07jan_longpc.png
http://www.asu.cas.cz/~asteroid/2486_07jan_shortpc.png
Compare with the data from the December lunation:
http://www.asu.cas.cz/~asteroid/2486_all.png
http://www.asu.cas.cz/~asteroid/2486_longpc.png
http://www.asu.cas.cz/~asteroid/2486_shortpc.png
An evolution of the 4.45-h lightcurve component is apparent, but no more new features.

Ok, this second lunation for the probable binary is effectively over now; the Moon is brightenning and approaching the asteroid. We are waiting with publication of our CBET announcement on it for a re-reduction of the additional data by Francois from Pic du Midi. Francois, please let us know how it goes there at your side. Thanks.

Cheers, Petr [2007-01-27 12:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm Just waiting on this while 4951 and 2478 are below 30 degrees above horizon. I mean I plan a short session only - similarly to yesterday's session. In addition to that I can link data if needed. Adrian [2007-01-26 16:53, Modra] Message sent to BinAstPhotSurvey conference

· Change in plans. Vishju and Ron are going to work Iwamoto tonight so we will instead image 2486 Metsahovi.

-Walt [2007-01-26 03:22, Sonoita]

· Observed from 20:27 to 22:38 UT, Jan.21 under thickening cirrus clouds.

Stefan/Jozef [2007-01-22 00:56, Modra] Message sent to BinAstPhotSurvey conference

· The night of Dec. 19.4 by Vishnu and Ron from Badlands joined in. It fits well with the additive 2-period solution, except last five points, which are spurious due to a nearby bright star. No trustworthy attenuation detected in the object so far. Updated estimates of the periods:
4.4516 +/-0.0003 h and 2.6404 +/-0.0004 h
http://www.asu.cas.cz/~asteroid/2486_all.png
http://www.asu.cas.cz/~asteroid/2486_longpc.png
http://www.asu.cas.cz/~asteroid/2486_shortpc.png

Ok, there still remains to be added the one night from Pic du Midi announced by Francois a few days ago. Nevertheless, we may prepare an announcement on the probable binary nature (though not a full, regular detection) for CBET. I'll circulate a draft among the collaborators shortly.

Cheers, Petr [2006-12-21 14:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began observing this target ~ 7:40 UTC and will finish at ~12:30 UTC.

Ron & Vishnu [2006-12-19 07:49, Vishnu Reddy/Tucson]

· The night of Dec. 16.9 by Gabo and Marek from Skalnate Pleso joined in. It fits entirely with the additive 2-period solution, no event occured. Updated estimates of the periods:
4.4514 +/-0.0004 h and 2.6401 +/-0.0005 h
http://www.asu.cas.cz/~asteroid/2486_all.png
http://www.asu.cas.cz/~asteroid/2486_longpc.png
http://www.asu.cas.cz/~asteroid/2486_shortpc.png

Francois has announced one session taken from Pic du Midi to be reduced. We will wait for it and then we will consider how to go on with this target. An announcement of the probable binary nature though not a full, regular detection in CBET will be in order.

Cheers, Petr [2006-12-18 10:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· The night of Dec. 17.3 by Walt, John and Dirk from SRO joined in, it fits entirely with the additive 2-period solution, no event occured. Updated estimates of the periods:
4.4515 +/-0.0004 h and 2.6401 +/-0.0006 h
http://www.asu.cas.cz/~asteroid/2486_all.png
http://www.asu.cas.cz/~asteroid/2486_longpc.png
http://www.asu.cas.cz/~asteroid/2486_shortpc.png

Cheers, Petr [2006-12-17 15:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current status (data from the two sessions taken in the last night by Gabo from S.Pleso and by John et al. from Sonoita to be joined in after they are reduced): Data from 9 nights fit entirely with the two additive periods 4.4513 +/-0.0005 h and 2.6401 +/-0.0007 h, see
http://www.asu.cas.cz/~asteroid/2486_all.png
http://www.asu.cas.cz/~asteroid/2486_longpc.png
http://www.asu.cas.cz/~asteroid/2486_shortpc.png
No event seen. It is probable that either mutual events don't occur in current geometry or the orbital period is long.

Given the character and considering that more observations are needed to establish the other recent binary candidate 3073 Kursk, I suggest to concentrate on the latter if you can take data with errors not greater than 0.03 mag for it. A bias against detection of longer orbital periods (like 2486 may be) is to be modeled in any case.

Cheers, Petr [2006-12-17 14:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· If the weather holds we will get another long run on this one beginning around 4:30 UT.

John G [2006-12-17 03:35, Sonoita]

· This object observed from 18:25 UT to 02:24 UT, December16/17. Gabo [2006-12-17 02:44, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· I just added three nights from SRO and one by me and all new data agree very well with periods 4.4513 and 2.6401 h. Both periods are unique but there are no events yet...

Peter K. [2006-12-16 21:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 1:30 UT and will finish at 5 UT. Peter K. [2006-12-16 03:10, Ondrejov]

· We should image this one again tonight from ~5UT to ~12UT. Maybe longer.

Sent reduction of data from the previous two nights to Petr and Peter just now.

-Walt [2006-12-16 02:30, Sonoita] Message sent to BinAstPhotSurvey conference

· We should image this one again tonight from ~5UT to ~12UT. Maybe longer.

Sent reduction of data from the previous two nights to Petr and Peter just now.

-Walt [2006-12-16 00:24, Sonoita]

· Session 2006-12-15.1 by Michal and Marek from Skalnate Pleso joined in, it fits well with the 2-period solution, no event.

They also checked the first seven points of their session 2006-12-13.1 and found them affected by flatfield imperfection. Thus, the seven decreased points appear spurious; they are x-ed out in following updated pictures:
http://www.asu.cas.cz/~asteroid/2486_all.png
http://www.asu.cas.cz/~asteroid/2486_longpc.png
http://www.asu.cas.cz/~asteroid/2486_shortpc.png

So, no event seen so far. Lets see what further observations that are being gathered will show. Of course, it is possible that mutual events don't occur in current geometry, or the orbital period may be long. Certainly, we will not work it to death, but a few more sessions wouldn't harm to catch event if it occurs.

Btw, I remind that it is best to send data both to me and Peter Kusnirak, so that that we may attend to them more promptly.

Cheers, Petr [2006-12-15 09:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:35, but light layer of Ci present. Michal [2006-12-14 22:37, SkalnatePleso] [Remove]

· Two nights by Michal ane Marek from S.Pleso and two nights by Walt et al. from SRO showed that this one has an additive 2-periodic lightcurve.

In following paragraph, I'm going to write a few details on how it has been resolved. My intention here is to give you an idea how it works.

A search for a single period showed a period of 4.45 h,
http://www.asu.cas.cz/~asteroid/2486_x.png
but the fit was far from perfect. In particular, there appeared an additional low-amplitude variation on each of the four nights; see, for example, residuals in
http://www.asu.cas.cz/~asteroid/2486_061212_sro_x.png

A search with additive 2-period model gave a clear and unique fit:
http://www.asu.cas.cz/~asteroid/2486_all.png
http://www.asu.cas.cz/~asteroid/2486_longpc.png
http://www.asu.cas.cz/~asteroid/2486_shortpc.png
Fits of the individual nightly data see in following pictures (cf the first one with the corresponding plot with one period only above):
http://www.asu.cas.cz/~asteroid/2486_061212_sro.png
http://www.asu.cas.cz/~asteroid/2486_061212_spleso.png
http://www.asu.cas.cz/~asteroid/2486_061213_sro.png
http://www.asu.cas.cz/~asteroid/2486_061213_spleso.png

The additive 2-periodic character indicates that the object is probably binary. To be sure, we need to detect mutual events. A short piece of a possible event is the first seven points of the night 2006-12-13.1 from SPleso (Marek/Michal, please confirm that the seven points are OK and not spurious). With both observed periods being short (2.64 h and 4.45 h; we cannot resolve formally which one is primary and which is secondary without observations of mutual events now), the system is apparently fully non-synchronous. Though we cannot really guess Porb, it may be relatively long-ish. I encourage all northern hemisphere observers who can take good data (errors <0.03 mag, sessions longer than 2 hours) to observe this one so that to hopefully catch events that will confirm the probable binary nature of the object and will allow to derive its Porb.

Btw, the shape of the 4.45-h lightcurve component with several local extrema resembles the longer period component of the other fully non-synchronous binary 1717 Arlon (detected earlier in this year) that also showed multiple local extrema. We should see in future what it means.

Cheers, Petr [2006-12-14 10:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 23:10 UT in average weather conditions. Michal [2006-12-13 23:42, SkalnatePleso] [Remove]

· We observed it from ~4UT to 12:15 UT last night. Data sent to Petr. Will work it again tonight.

Asteroid 33758 was also in the field. Does it fit within the survey paramaters?

-Walt [2006-12-13 00:58, Sonoita] Message sent to BinAstPhotSurvey conference

· Observing from 23:20 UT in a variable weather conditions. Michal [2006-12-12 23:25, SkalnatePleso] [Remove]

· Depending on weather, we will try to pick this one up tonight as well to give a nice uninterrupted light curve.

-Walt [2006-12-11 23:57, Sonoita] Message sent to BinAstPhotSurvey conference

· Observing from 18:35 UT in a good conditions - expecting a long session. Michal [2006-12-11 18:50, SkalnatePleso] [Remove]

(76818) 2000 RG79 (Finished) - return binary [Add new note]
· Done in the 4th apparition. [2017-02-06 10:36, Ondrejov]

· Started this at 23:30, Jan 15 UT to capture the 0.759 phase event.
Don [2017-01-16 00:57, Sugarloaf] Message sent to observers

· Additional data were taken by Don Pray from Sugarloaf Mountain and by Kamil Hornoch and Jan Vrastil from here. http://www.asu.cas.cz/~asteroid/76818_2016_porb.png
http://www.asu.cas.cz/~asteroid/76818_2016_p1.png

Last data for this apparition would be useful. Errors <= 0.02 mag are needed; don't bother in suboptimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-15 19.83 0.267
2017- 1-16 9.96 0.267
2017- 1-17 0.08 0.267
2017- 1-17 14.21 0.267
2017- 1-18 4.34 0.267
2017- 1-18 18.46 0.267
2017- 1-19 8.59 0.267
2017- 1-19 22.72 0.267
2017- 1-20 12.84 0.267
2017- 1-21 2.97 0.267
2017- 1-21 17.10 0.267
2017- 1-22 7.23 0.267
2017- 1-22 21.35 0.267
2017- 1-23 11.48 0.267
2017- 1-24 1.61 0.267
2017- 1-24 15.73 0.267
2017- 1-25 5.86 0.267
2017- 1-25 19.99 0.267
2017- 1-26 10.11 0.267
2017- 1-27 0.24 0.267
2017- 1-27 14.37 0.267
2017- 1-28 4.50 0.267
2017- 1-28 18.62 0.267
2017- 1-29 8.75 0.267
2017- 1-29 22.88 0.267
2017- 1-30 13.00 0.267
2017- 1-31 3.13 0.267
2017- 1-31 17.26 0.267
2017- 2- 1 7.38 0.267
2017- 2- 1 21.51 0.267
2017- 2- 2 11.64 0.267

Date/Time UTC (LTc.) Phase
--------------------------
2017- 1-15 12.65 0.759
2017- 1-16 2.77 0.759
2017- 1-16 16.90 0.759
2017- 1-17 7.03 0.759
2017- 1-17 21.16 0.759
2017- 1-18 11.28 0.759
2017- 1-19 1.41 0.759
2017- 1-19 15.54 0.759
2017- 1-20 5.66 0.759
2017- 1-20 19.79 0.759
2017- 1-21 9.92 0.759
2017- 1-22 0.04 0.759
2017- 1-22 14.17 0.759
2017- 1-23 4.30 0.759
2017- 1-23 18.43 0.759
2017- 1-24 8.55 0.759
2017- 1-24 22.68 0.759
2017- 1-25 12.81 0.759
2017- 1-26 2.93 0.759
2017- 1-26 17.06 0.759
2017- 1-27 7.19 0.759
2017- 1-27 21.31 0.759
2017- 1-28 11.44 0.759
2017- 1-29 1.57 0.759
2017- 1-29 15.70 0.759
2017- 1-30 5.82 0.759
2017- 1-30 19.95 0.759
2017- 1-31 10.08 0.759
2017- 2- 1 0.20 0.759
2017- 2- 1 14.33 0.759
2017- 2- 2 4.46 0.759
2017- 2- 2 18.58 0.759

Clear Skies, Petr [2017-01-11 11:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this tonight to capture the 0.756 phase event.
Don [2016-12-21 01:43, Sugarloaf] Message sent to observers

· This return binary has been observed in its current apparition by Don Pray from Sugarloaf Mountain, by Vladimir Benishek from Sopot, and by Hana Kucakova and Kamil Hornoch from here:
http://www.asu.cas.cz/~asteroid/76818_2016_porb.png
http://www.asu.cas.cz/~asteroid/76818_2016_p1.png

More high quality data (errors < 0.02 mag) would be still useful for refined modeling; don't bother in suboptimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 9.35 0.258
2016-12-17 23.48 0.258
2016-12-18 13.61 0.258
2016-12-19 3.74 0.258
2016-12-19 17.86 0.258
2016-12-20 7.99 0.258
2016-12-20 22.12 0.258
2016-12-21 12.24 0.258
2016-12-22 2.37 0.258
2016-12-22 16.50 0.258
2016-12-23 6.62 0.258
2016-12-23 20.75 0.258
2016-12-24 10.88 0.258
2016-12-25 1.01 0.258
2016-12-25 15.13 0.258
2016-12-26 5.26 0.258
2016-12-26 19.39 0.258
2016-12-27 9.51 0.258
2016-12-27 23.64 0.258
2016-12-28 13.77 0.258
2016-12-29 3.89 0.258
2016-12-29 18.02 0.258
2016-12-30 8.15 0.258
2016-12-30 22.28 0.258
2016-12-31 12.40 0.258
2017- 1- 1 2.53 0.258
2017- 1- 1 16.66 0.258
2017- 1- 2 6.78 0.258
2017- 1- 2 20.91 0.258
2017- 1- 3 11.04 0.258
2017- 1- 4 1.16 0.258
2017- 1- 4 15.29 0.258
2017- 1- 5 5.42 0.258
2017- 1- 5 19.55 0.258
2017- 1- 6 9.67 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 2.26 0.756
2016-12-17 16.38 0.756
2016-12-18 6.51 0.756
2016-12-18 20.64 0.756
2016-12-19 10.76 0.756
2016-12-20 0.89 0.756
2016-12-20 15.02 0.756
2016-12-21 5.15 0.756
2016-12-21 19.27 0.756
2016-12-22 9.40 0.756
2016-12-22 23.53 0.756
2016-12-23 13.65 0.756
2016-12-24 3.78 0.756
2016-12-24 17.91 0.756
2016-12-25 8.03 0.756
2016-12-25 22.16 0.756
2016-12-26 12.29 0.756
2016-12-27 2.42 0.756
2016-12-27 16.54 0.756
2016-12-28 6.67 0.756
2016-12-28 20.80 0.756
2016-12-29 10.92 0.756
2016-12-30 1.05 0.756
2016-12-30 15.18 0.756
2016-12-31 5.30 0.756
2016-12-31 19.43 0.756
2017- 1- 1 9.56 0.756
2017- 1- 1 23.69 0.756
2017- 1- 2 13.81 0.756
2017- 1- 3 3.94 0.756
2017- 1- 3 18.07 0.756
2017- 1- 4 8.19 0.756
2017- 1- 4 22.32 0.756
2017- 1- 5 12.45 0.756
2017- 1- 6 2.57 0.756

Clear Skies, Petr [2016-12-12 14:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray took first three nights for this return binary in its current apparition:
http://www.asu.cas.cz/~asteroid/76818_2016_porb.png
http://www.asu.cas.cz/~asteroid/76818_2016_p1.png

Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-29 10.69 0.261
2016-11-30 0.82 0.261
2016-11-30 14.94 0.261
2016-12- 1 5.07 0.261
2016-12- 1 19.20 0.261
2016-12- 2 9.32 0.261
2016-12- 2 23.45 0.261
2016-12- 3 13.58 0.261
2016-12- 4 3.70 0.261
2016-12- 4 17.83 0.261
2016-12- 5 7.96 0.261
2016-12- 5 22.09 0.261
2016-12- 6 12.21 0.261
2016-12- 7 2.34 0.261
2016-12- 7 16.47 0.261
2016-12- 8 6.59 0.261
2016-12- 8 20.72 0.261
2016-12- 9 10.85 0.261
2016-12-10 0.97 0.261
2016-12-10 15.10 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-29 17.76 0.761
2016-11-30 7.89 0.761
2016-11-30 22.01 0.761
2016-12- 1 12.14 0.761
2016-12- 2 2.27 0.761
2016-12- 2 16.39 0.761
2016-12- 3 6.52 0.761
2016-12- 3 20.65 0.761
2016-12- 4 10.77 0.761
2016-12- 5 0.90 0.761
2016-12- 5 15.03 0.761
2016-12- 6 5.16 0.761
2016-12- 6 19.28 0.761
2016-12- 7 9.41 0.761
2016-12- 7 23.54 0.761
2016-12- 8 13.66 0.761
2016-12- 9 3.79 0.761
2016-12- 9 17.92 0.761
2016-12-10 8.04 0.761
2016-12-10 22.17 0.761

Clear Skies, Petr [2016-11-29 07:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:20 UT.
Don [2016-11-28 00:33, Sugarloaf] Message sent to observers

· Started this one at 02:30 UT.
Don [2016-11-27 02:30, Sugarloaf]

· Started this return binary at 01:00 UT.
Don [2016-11-23 01:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for the 3rd apparition. Petr [2013-10-15 10:15, Ondrejov]

· I began a run on this and should capture the second half of the 0.25 phase event.
Don [2013-09-29 23:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run at 23:45, Sept 26 UT to catch the 0.25 phase event.
Don [2013-09-26 23:47, Sugarloaf]

· Started this at 23:30 UT at what should be near bottom of the 0.755 phase event.
Don [2013-09-24 23:29, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this at 00:35 UT in the early part of the 0.25 phase event. [2013-09-24 01:00, Sugarloaf]

· In the past lunation we monitored the primary event (no data for the secondary event), two nights by Peter Kusnirak and Jan Vrastil from here, one night by Ninel Gaftonyuk and Yura Krugly from Simeiz and one night by Don Pray from Sugarloaf Mountain. The primary event changed substantially on the last night (September 9.9):
http://www.asu.cas.cz/~asteroid/76818_2013_porb.png
http://www.asu.cas.cz/~asteroid/76818_2013_p1.png
Monitoring both events in the upcoming lunation, which will be the last lunation for this apparition, will be useful for resolving the pole ambiguity. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 9-22 21.73 0.250
2013- 9-23 11.86 0.250
2013- 9-24 1.99 0.250
2013- 9-24 16.11 0.250
2013- 9-25 6.24 0.250
2013- 9-25 20.37 0.250
2013- 9-26 10.50 0.250
2013- 9-27 0.62 0.250
2013- 9-27 14.75 0.250
2013- 9-28 4.88 0.250
2013- 9-28 19.00 0.250
2013- 9-29 9.13 0.250
2013- 9-29 23.26 0.250
2013- 9-30 13.38 0.250
2013-10- 1 3.51 0.250
2013-10- 1 17.64 0.250
2013-10- 2 7.77 0.250
2013-10- 2 21.89 0.250
2013-10- 3 12.02 0.250
2013-10- 4 2.15 0.250
2013-10- 4 16.27 0.250
2013-10- 5 6.40 0.250
2013-10- 5 20.53 0.250
2013-10- 6 10.65 0.250
2013-10- 7 0.78 0.250
2013-10- 7 14.91 0.250
2013-10- 8 5.04 0.250
2013-10- 8 19.16 0.250
2013-10- 9 9.29 0.250
2013-10- 9 23.42 0.250
2013-10-10 13.54 0.250
2013-10-11 3.67 0.250
2013-10-11 17.80 0.250
2013-10-12 7.92 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2013- 9-22 14.73 0.755
2013- 9-23 4.86 0.755
2013- 9-23 18.99 0.755
2013- 9-24 9.11 0.755
2013- 9-24 23.24 0.755
2013- 9-25 13.37 0.755
2013- 9-26 3.49 0.755
2013- 9-26 17.62 0.755
2013- 9-27 7.75 0.755
2013- 9-27 21.87 0.755
2013- 9-28 12.00 0.755
2013- 9-29 2.13 0.755
2013- 9-29 16.26 0.755
2013- 9-30 6.38 0.755
2013- 9-30 20.51 0.755
2013-10- 1 10.64 0.755
2013-10- 2 0.76 0.755
2013-10- 2 14.89 0.755
2013-10- 3 5.02 0.755
2013-10- 3 19.14 0.755
2013-10- 4 9.27 0.755
2013-10- 4 23.40 0.755
2013-10- 5 13.53 0.755
2013-10- 6 3.65 0.755
2013-10- 6 17.78 0.755
2013-10- 7 7.91 0.755
2013-10- 7 22.03 0.755
2013-10- 8 12.16 0.755
2013-10- 9 2.29 0.755
2013-10- 9 16.41 0.755
2013-10-10 6.54 0.755
2013-10-10 20.67 0.755
2013-10-11 10.80 0.755
2013-10-12 0.92 0.755

Clear Skies, Petr [2013-09-18 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 01:05 UT.
Don [2013-09-07 02:30, Sugarloaf]

· This return binary (3rd apparition) was worked well by Peter Kusnirak, Kamil Hornoch and Jan Vrastil from here and by Don Pray from Sugarloaf Mountain in the past lunation:
http://www.asu.cas.cz/~asteroid/76818_2013_porb.png
http://www.asu.cas.cz/~asteroid/76818_2013_p1.png

Monitoring events in the current lunation would be useful; we hope to resolve the pole ambiguity published in Pravec et al. (2012) after this apparition is completed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 8-26 19.85 0.255
2013- 8-27 9.98 0.255
2013- 8-28 0.10 0.255
2013- 8-28 14.22 0.255
2013- 8-29 4.35 0.255
2013- 8-29 18.47 0.255
2013- 8-30 8.60 0.255
2013- 8-30 22.72 0.255
2013- 8-31 12.84 0.255
2013- 9- 1 2.97 0.255
2013- 9- 1 17.09 0.255
2013- 9- 2 7.22 0.255
2013- 9- 2 21.34 0.255
2013- 9- 3 11.46 0.255
2013- 9- 4 1.59 0.255
2013- 9- 4 15.71 0.255
2013- 9- 5 5.84 0.255
2013- 9- 5 19.96 0.255
2013- 9- 6 10.08 0.255
2013- 9- 7 0.21 0.255
2013- 9- 7 14.33 0.255
2013- 9- 8 4.46 0.255
2013- 9- 8 18.58 0.255
2013- 9- 9 8.70 0.255
2013- 9- 9 22.83 0.255
2013- 9-10 12.95 0.255
2013- 9-11 3.08 0.255
2013- 9-11 17.20 0.255
2013- 9-12 7.32 0.255
2013- 9-12 21.45 0.255
2013- 9-13 11.57 0.255
2013- 9-14 1.70 0.255
2013- 9-14 15.82 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2013- 8-27 3.07 0.766
2013- 8-27 17.20 0.766
2013- 8-28 7.32 0.766
2013- 8-28 21.44 0.766
2013- 8-29 11.57 0.766
2013- 8-30 1.69 0.766
2013- 8-30 15.82 0.766
2013- 8-31 5.94 0.766
2013- 8-31 20.06 0.766
2013- 9- 1 10.19 0.766
2013- 9- 2 0.31 0.766
2013- 9- 2 14.44 0.766
2013- 9- 3 4.56 0.766
2013- 9- 3 18.68 0.766
2013- 9- 4 8.81 0.766
2013- 9- 4 22.93 0.766
2013- 9- 5 13.06 0.766
2013- 9- 6 3.18 0.766
2013- 9- 6 17.30 0.766
2013- 9- 7 7.43 0.766
2013- 9- 7 21.55 0.766
2013- 9- 8 11.68 0.766
2013- 9- 9 1.80 0.766
2013- 9- 9 15.92 0.766
2013- 9-10 6.05 0.766
2013- 9-10 20.17 0.766
2013- 9-11 10.30 0.766
2013- 9-12 0.42 0.766
2013- 9-12 14.54 0.766
2013- 9-13 4.67 0.766
2013- 9-13 18.79 0.766
2013- 9-14 8.92 0.766
2013- 9-14 23.04 0.766

Clear Skies, Petr [2013-08-26 11:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· This target is done for this lunation with double coverage of both events:

http://www.asu.cas.cz/~asteroid/76818_2013_p1.png
http://www.asu.cas.cz/~asteroid/76818_2013_porb.png

Peter K. [2013-08-11 16:17, Ondrejov] Message sent to observers

· I plan to start this at 01:45 UT and will capture the 0.777 phase event.
Don [2013-08-11 00:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing from 21:15 UT tonight and the primary event is in progress. Peter K. [2013-08-10 23:41, Ondrejov] Message sent to observers

· Started a run at 02:20 UT.
Don [2013-08-06 02:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 02:20 UT.
Don [2013-08-05 02:24, Sugarloaf]

· Started this at 02:30 UT under good conditions.
Don [2013-08-04 02:30, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I will try to observe this one although the weather is not much promissing for long run... Best wishes, Kamil [2013-08-03 19:24, Ondrejov] Message sent to observers

· Observing this one tonight between calibrations and linkages of other targets. Best wishes, Kamil [2013-08-03 00:09, Ondrejov]

· Observing this one from 21:45 UT in good conditions. Best wishes, Kamil [2013-07-18 21:58, Ondrejov] Message sent to observers

· Don Pray took the first session for this return binary in its current 3rd apparition, captured an event. With the short duration (3.3 h) of the session, only a tentative disentangling of the primary and eclipse lightcurve components is possible:
http://www.asu.cas.cz/~asteroid/76818_2013_porb.png
More data for events as well as outside events are needed. I encourage others to help out.

Clear Skies, Petr [2013-07-18 09:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a run on this returning binary last night (July 17 UT).
Don [2013-07-17 20:41, Sugarloaf]

· Five more sessions by Don from Carbuncle, Leos from Modra, and Peter from here taken during Jan. 22-30 have further refined the solution. It is in agreement with the data from the 2005 discovery apparition,
http://www.asu.cas.cz/~asteroid/76818_08_09_p1.png
http://www.asu.cas.cz/~asteroid/76818_08dec_09jan_porb.png
We will see whether the data from the two apparitions are already sufficient for a good orbit solution, or if a third apparition is needed.

Great work all.

Cheers, Petr [2009-02-09 13:57, Ondrejov] Message sent to observers

· Started a run at about 00:15. Clouds may cut it short.
Don [2009-02-01 00:46, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 22:55, Jan 29 UT.
Don [2009-01-29 22:56, CarbuncleHill]

· Started a run at 23:00, Jan 26 UT.
Don [2009-01-27 00:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed for 6 hours tonight. Conditions were slightly changing during the session and I wasn't sure how long I can observe. Peter K. [2009-01-25 23:57, Ondrejov] Message sent to observers

· started at 17 UT. Leos [2009-01-25 17:09, Modra]

· I started a run at 23:05. Clouds may or may not stay away.
Don [2009-01-21 23:08, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This return Hungaria binary has been observed on a number of nights between 2008-12-17.9 and 2009-01-17.1
by Brian from PDO,
by Don from Carbuncle,
by Leos from Modra,
by Peter and Kamil from Ondrejov, and
by Yura and Ninel from Simeiz.
The data combined together with a number of nights taken by Brian from PDO and by Bob from GMARS in October and November. The P_1 and P_orb components (the latter containing both the eclipse/occultation and the secondary rotation components) resolved, they agree pretty well with data from the 2005 discovery apparition. During the last four weeks the binary showed deep and wide events, apparently both occultations and eclipses occuring there. In October and November, the events were generally more shallow and narrower (a few deviations not understand yet), that indicates that we were seeing eclipses or occultations, but not both in the October-November geometry. The data will be pretty useful for modeling the binary's orbit.
http://www.asu.cas.cz/~asteroid/76818_08_09_p1.png
http://www.asu.cas.cz/~asteroid/76818_08dec_09jan_porb.png
http://www.asu.cas.cz/~asteroid/76818_08nov_porb.png
http://www.asu.cas.cz/~asteroid/76818_08oct_porb.png

The binary is still observable during these nights. It would be useful to monitor mutual events. Our data for the secondary event have been somewhat noisy so far, so a couple good sessions covering it would be useful. The primary event has been covered well, but we expect that it will further evolve before the end of this month, so obtaining one or two good sessions for it would be useful as well. Ephemerides for the events below. Please observe it only when a mutual event is predicted to occur well inside your evening observing window.

Date/Time UTC (LTc.) Phase
--------------------------
2009- 1-19 23.49 0.255
2009- 1-20 13.62 0.255
2009- 1-21 3.74 0.255
2009- 1-21 17.87 0.255
2009- 1-22 8.00 0.255
2009- 1-22 22.13 0.255
2009- 1-23 12.25 0.255
2009- 1-24 2.38 0.255
2009- 1-24 16.51 0.255
2009- 1-25 6.63 0.255
2009- 1-25 20.76 0.255
2009- 1-26 10.89 0.255
2009- 1-27 1.01 0.255
2009- 1-27 15.14 0.255
2009- 1-28 5.27 0.255
2009- 1-28 19.40 0.255
2009- 1-29 9.52 0.255
2009- 1-29 23.65 0.255
2009- 1-30 13.78 0.255
2009- 1-31 3.90 0.255
2009- 1-31 18.03 0.255
2009- 2- 1 8.16 0.255
2009- 2- 1 22.28 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2009- 1-20 6.48 0.750
2009- 1-20 20.61 0.750
2009- 1-21 10.73 0.750
2009- 1-22 0.86 0.750
2009- 1-22 14.99 0.750
2009- 1-23 5.11 0.750
2009- 1-23 19.24 0.750
2009- 1-24 9.37 0.750
2009- 1-24 23.49 0.750
2009- 1-25 13.62 0.750
2009- 1-26 3.75 0.750
2009- 1-26 17.88 0.750
2009- 1-27 8.00 0.750
2009- 1-27 22.13 0.750
2009- 1-28 12.26 0.750
2009- 1-29 2.38 0.750
2009- 1-29 16.51 0.750
2009- 1-30 6.64 0.750
2009- 1-30 20.76 0.750
2009- 1-31 10.89 0.750
2009- 2- 1 1.02 0.750
2009- 2- 1 15.15 0.750

Clear Skies, Petr [2009-01-19 13:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:00 Jan 17 UT.
Don [2009-01-17 00:12, CarbuncleHill]

· Observing this one from ~18:30 UT under relative poor conditions. Best wishes, Kamil [2009-01-16 19:15, Ondrejov] Message sent to observers

· Started a run at 23:45.
Don [2009-01-15 23:36, CarbuncleHill]

· Observing from 17:15 UT in moderate conditions. Peter K. [2009-01-13 17:36, Ondrejov]

· Started a run at 23:30, Jan 3 UT.
Don [2009-01-04 00:37, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this about 0100 UT, Jan 3. [2009-01-03 01:42, PalmerDivide]

· Observed 28/29 and 29/30.12. Data sent to Peter. leos [2008-12-31 11:07, Modra] Message sent to observers

· Started this about 0200 UT, Dec. 31.

Happy New Year, everyone. [2008-12-31 05:53, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Started this about 0100 UT, Dec. 30. [2008-12-30 01:26, PalmerDivide]

· Started this about 0100 UT, Dec. 29. [2008-12-29 03:31, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Started this about 0100 UT, Dec. 28. [2008-12-28 01:00, PalmerDivide]

· Started this about 0100 UT, Dec. 27. [2008-12-27 00:54, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Not sure if I manage this in the evening - clouds are approaching and (2110) done by me previously is still not high enough above horizon. But 2110 was easy target - it can be considered as more or less finished - fast rotator and large amplitude of the lightcurve. Adrian [2008-12-25 16:10, Modra] Message sent to observers

· Worked this about 9 hours (Dec. 21 UT). Data sent to Petr and Peter. [2008-12-21 10:31, PalmerDivide]

· Started about 02:00 UT (Dec. 19). Had to quit at 07:45 due to very high winds (~30 mph). [2008-12-19 07:45, PalmerDivide] Message sent to observers

· Started working this at 01:00 UT (Dec. 18). There is a threat of snow later so I may not get a full run. [2008-12-18 01:02, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Brian Warner has worked the returning Hungaria binary on 21 nights during 2008 Oct. 2 to Nov. 26, supported with one night by Bob Stephens from GMARS. The observations show the P_1 and P_orb components with parameters in agreement with those estimated from the 2005 discovery apparition, but there are present some new features or deviations that we don't understand. See
http://www.asu.cas.cz/~asteroid/76818_08_p1.png
http://www.asu.cas.cz/~asteroid/76818_08_porb.png
Cf. with the 2005 apparition data that showed an ordinary binary lightcurve:
http://www.asu.cas.cz/~ppravec/76818_longpc.png
http://www.asu.cas.cz/~ppravec/76818_shortpc.png

Good quality observations from more than one station are needed to establish what it is there in the current apparition. Be careful with proper handling of background stars - the asteroid is in relatively low galactic latitudes, though it gradually moves away from the Milky Way.

Clear Skies, Petr [2008-12-15 10:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations by Ninel Gaftonyuk from Simeiz of 2005-10-03.9 to 06.9 are entirely with agreement with the data obtained in August-September, see
http://www.asu.cas.cz/~ppravec/76818_longpc_1003_1006.png
http://www.asu.cas.cz/~ppravec/76818_shortpc_1003_1006.png
Very small changes seen, periods refined slightly. Well, the Ninel's observations are not of as thorough coverage as would be needed for full follow-up observations; most phases of the orbital period covered only once, and some not at all, that is especially critical during the mutual events which were covered poorly. So, these follow-up observations provide new information, but a bit more thorough coverage will be needed in future similar follow-up observations.

In any case, the asteroid is too faint (about V~17) for almost all of us now. We may consider the campaign finished, and put the results into a paper for P&SS together with results for 5905 Johnson and 9069 Hovland (in preparation).

Cheers, Petr Pravec [2005-10-24 13:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yura and Vasilij have also measured V-R=0.44 +/-0.03 for the asteroid on the two nights of 09-08 and 09. (The V data joined in here as well, they fit nicely.)

Cheers, Petr [2005-09-17 11:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data added:
2005-09-08.9, 09.9, and 10.8 by Yurij Krugly and Vasilij Shevchenko from Kharkiv Observatory, Ukraine
2005-09-10.1 by Shannon Nudds from Elginfield
2005-09-12.1 and 13.1 by Don Pray from Carbuncle Hill
2005-09-12.2, 13.2, and 15.3 by Brian Warner from Palmer Divide

Current solution see following pictures:
http://www.asu.cas.cz/~ppravec/76818_all.png
http://www.asu.cas.cz/~ppravec/76818_shortpc.png
http://www.asu.cas.cz/~ppravec/76818_longpc.png
http://www.asu.cas.cz/~ppravec/76818_longpc_0807_0901.png
http://www.asu.cas.cz/~ppravec/76818_longpc_0902_0915.png

The solution is refined to:
Pprim = 3.1666 h (formal error <0.0001 h, Delta Psyn-sid = 0.0002 h)
Porb = 14.127 +/- 0.002 h (Delta Psyn-sid = 0.004 h)
Aprim = 0.14 mag
Asec = 0.06 mag (A_sec^corr = 0.6 mag)
Ds/Dp = 0.35 ± 0.02.
H_R = 13.54 (error <0.2) assuming G = 0.15 +/- 0.02
The shapes of both rotational components have been pretty constant at a level of 0.01 mag during the whole campaign. Shapes of both events were also constant in most parts (except the shallow increasing branch of the primary event that naturally showed minor variations) during 2005-08-07 to 09-01. There occured fluctuations of the shapes of both events during 09-02 to 09-13 (but the primary event appeared the same as before 09-02 on the last night of 09-15) that we don't understand yet. We speculate that it was a shape effect of the primary affecting the appearance of the events that occured (temporarily ?) in the changing asteroid-earth-sun geometry; it will be needed to be modeled in future.

Well, now there is the full moon break in the campaign. While this binary is formally well done for our Survey ---its binarity has been detected and basic parameters of the components estimated well--- follow up observations during the next lunation should be useful to monitor how the events will evolve with changing geometry; such data will allow to model its orbit. The follow up observations have a moderate priority, they don't need to be taken at a particular date, but good conditions and at least a couple collaborating stations will be needed to cover the events well. Each of the two events will have to be covered at least once, and we will also need to separate the rotational components, that means that some orbital phases outside the events will need to be covered twice. So, a minimum required total coverage will be 5xPprim = 16 hours, but in reality (considering that the coverage will be less than ideal for various reasons) it will be likely more like 30 hours total observing time. It means that at least 5 full nights will be needed. Accuracy needs to be 0.02 mag or better. Ok, I suggest that we don't plan exact dates for the follow up observations now, rather we will see how the next lunation goes and decide then when to do the follow up observations according to situation with other objects and weather conditions at stations who will be able to work it.

Great work all!

Cheers,
Petr Pravec [2005-09-16 09:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll attempt a run on this between 1 and 3 AM ut Sept 12. [2005-09-11 22:47, CarbuncleHill]

· New data added:
2005-09-01.3 by Ron and Vishnu from Badlands
2005-09-08.9 by Peter K. from here
2005-09-11.1 by Don from Carbuncle Hill
2005-09-11.2 by Brian from Palmer Divide.

Current solution see following pictures:
http://www.asu.cas.cz/~ppravec/76818_all.png
http://www.asu.cas.cz/~ppravec/76818_shortpc.png
http://www.asu.cas.cz/~ppravec/76818_longpc_0807_0901.png
http://www.asu.cas.cz/~ppravec/76818_longpc_0902_0911.png
The primary events (about orbital phase 0.25) were of a nearly constant shape during 2005-08-07 to 09-01 (though minor variations in the increasing branch were naturally present there). During 09-02 to 09-11 they, however, showed an erratic behaviour, see the last picture above; it is not really understood yet. Further monitoring of the events should be useful (in good sky conditions only, of course, with errors 0.02 mag and better) so that we see what happens there further. And, a coverage of the secondary event (around orbital phase 0.75) should be very useful as well; it was last covered on 09-01.0, so we don't know what happened there recently at all!

Cheers, Petr [2005-09-11 17:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will also target 76818 from between 1 and 3am ut. [2005-09-10 22:28, CarbuncleHill]

· It looks to be clear tonight (starting 03:00 Sept. 11 UT) so I'll put in a run on the asteroid. [2005-09-10 22:06, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Those of you who can work the binary (76818) for its evolving mutual events (probably moving from total to partial events geometry, that promisses to give as a good information on orbital parameters of the system) with accuracy about 0.02 mag and better, below is a list of predicted mutual events. The orbital phases refer to the figure
http://www.asu.cas.cz/~ppravec/76818_longpc.png
(0.245 being primary and 0.755 being secondary events).
Orbital phases well away from the predicted times don't need to be covered so densely, so it might be even alternated with another target if your system allows that. Intervals +/-Pprim (=3.166 hr) around the events should be covered densely, however. (To give you an idea why the coverage of +/-Pprim is needed: we need to monitor the primary rotational lightcurve at the same time, that can be well done outside mutual events only. Covering the intrervals at least 2Pprim assures that we shall be able to deconvolve the lightcurve components well.)

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2005- 9- 8 19.58 0.245
2005- 9- 9 2.77 0.755
2005- 9- 9 9.70 0.245
2005- 9- 9 16.90 0.755
2005- 9- 9 23.83 0.245
2005- 9-10 7.02 0.755
2005- 9-10 13.96 0.245
2005- 9-10 21.15 0.755
2005- 9-11 4.08 0.245
2005- 9-11 11.28 0.755
2005- 9-11 18.21 0.245
2005- 9-12 1.41 0.755
2005- 9-12 8.34 0.245
2005- 9-12 15.53 0.755
2005- 9-12 22.47 0.245
2005- 9-13 5.66 0.755 [2005-09-08 17:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by Zbig/Shannon of 2005-09-02.2 and 05.2 added to the soltuion, see
http://www.asu.cas.cz/~ppravec/76818_all.png
http://www.asu.cas.cz/~ppravec/76818_longpc.png
http://www.asu.cas.cz/~ppravec/76818_shortpc.png
http://www.asu.cas.cz/~ppravec/76818_longpc_uwo.png
http://www.asu.cas.cz/~ppravec/76818_shortpc_uwo.png
The solution is refined to:
Pprim = 3.1663 +/- 0.0001 h (Delta Psyn-sid = 0.0002 h)
Porb = 14.127 +/- 0.003 h (Delta Psyn-sid = 0.004 h)
Aprim = 0.14 mag
Asec = 0.06 mag (A_sec^corr = 0.6 mag)
Ds/Dp = 0.35 ± 0.02.

The new data support that the event seen around orbital phase 0.25 is primary. Of particular interest now is that the primary event appears to begin to evolve rapidly. It suggests that the system's geometry is shifting from total to partial events. Such fast changes will be very useful for establishing some orbital parameters of the system, so continued follow up of this binary is needed. So, I encourage those of you who can work this binary with errors about 0.02 mag or better (but cannot work 2002 XD58 that has a priority) to work it now during these nights where there occur the rapid evolution of its mutual events.

Cheers, Petr [2005-09-07 08:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· I forgot to mention that the calibrated R data give (assuming G = 0.15 +/- 0.2) H_R = 13.55 (error likely <0.2). We don't know its V-R yet, but assuming it is 0.45 gives an estimate for H of 14.0 +/-0.2.

So, it looks that the MPC's H value of 13.5 is probably a bit too bright.

Cheers, Petr [2005-09-05 15:47, Ondrejov]

· New data by Peter K. taken here on 2005-08-30.9 and 09-01.0 added to the solution, as well as a few revised data by Brian. The three Ondrejov nights have been calibrated in the Cousins R system. The current data see on
http://www.asu.cas.cz/~ppravec/76818_all.png
http://www.asu.cas.cz/~ppravec/76818_longpc.png
http://www.asu.cas.cz/~ppravec/76818_shortpc.png

The best fit periods are now:
Pprim = 3.1664 ±0.0001 hr (Delta Psyn-sid = 0.0002 h)
Porb = 14.125 hr (error <0.005 hr)
Amplitudes of
Aprim = 0.14 mag
Asec = 0.07 mag (A_sec^corr = 0.6 mag)

The data begin to favor the event seen around orbital phase 0.75 in the above plots as secondary. With it, I am getting:
Ds/Dp = 0.35 ± 0.02.

Cheers, Petr [2005-09-05 15:47, Ondrejov]

(17730) 1998 AS4 (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on three nights: Unique solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/17730.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2017-02-05 14:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 01:35 UT.
Don [2017-02-03 02:28, Sugarloaf]

· Planning to start this at 01:40 UT.
Don [2017-02-02 01:10, Sugarloaf] Message sent to observers

· Did a run on this Jan 31 UT.
Don [2017-02-01 02:25, Sugarloaf] Message sent to BinAstPhotSurvey conference

(94346) 2001 QU88 (Finished) [Add new note]
· This new target was done by Julian Oey from Leura and by Roger Groom from Perth: Satisfactory solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/94346.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-01-30 13:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from Perth by Roger on 29th and 31st [2017-01-03 07:03, Blue Mountains Obs] Message sent to observers

· starting a new target from 16 UT [2016-12-25 06:46, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(6097) Koishikawa (Finished) [Add new note]
· Julian Oey took two good runs for this return "prime suspect" from Leura on 2017-01-22 and 23: Sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06097_b6.png
Object closed for this apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-01-26 06:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 12/26 from 13:51 UT for 4 hours [2016-12-29 09:27, Blue Mountains Obs] Message sent to observers

· observed 12/25 from 13:32UT for 4 hours [2016-12-25 22:36, Blue Mountains Obs]

· Starting a new target from 14:38 UT for 3 hours [2016-12-25 06:51, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2501) Lohja (Finished) [Add new note]
· This return "prime suspect" was done by Marek Husarik, Michal Pikler and Gabo Cervak from Skalnate Pleso on the past four nights: Great data, no deviation.
http://www.asu.cas.cz/~asteroid/02501_b7.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-01-24 13:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting at 20:50 UT. Gabo [2017-01-23 20:49, SkalnatePleso] [Remove]
Message sent to observers

· Worked on it for two nights (Jan 20 and 21).
Marek and Michal [2017-01-22 17:45, SkalnatePleso] [Remove]

· This return "prime suspect" was observed from Ondrejov, Skalnate Pleso and Leura Obs. and is done in its third apparition. Small deviations observed in previous data were not confirmed by current observations.

http://www.asu.cas.cz/~asteroid/02501_11_p1.png

Peter K. [2011-10-07 11:37, Ondrejov] Message sent to observers

· Observed in last night. Data sent do Peter K. Perhaps, could be finished.
Marek [2011-10-03 11:22, SkalnatePleso] [Remove]

· Observing from 20:10 UT to 03:30 UT. Gabo [2011-10-02 03:45, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 20:35 UT under excellent conditions. Peter K. [2011-10-01 21:29, Ondrejov]

· Observed from 20:00 UT to 03:30 UT in good condition. Gabo [2011-10-01 03:36, SkalnatePleso] [Remove]
Message sent to observers

· Restarted observation on 09/21 and 09/22 for 2 h each nights at the end of sessions. Period 3.81h. [2011-09-23 02:39, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Closed for the 3rd apparation, see notes on
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2010-08-22 09:21, Ondrejov]

· data obtained from 10.14 to 13.57 UT 07/31. still good data but getting shorter duration. [2010-08-02 12:57, Blue Mountains Obs] Message sent to observers

· Continue observation from 09:01UT to 15:20UT 07/17 in good condition. Target is still quite bright [2010-07-18 11:03, Blue Mountains Obs]

· observed from 08:16 to 15:23 UT 06/20 partly interupted by cloud. observing condition moderate. [2010-06-21 11:25, Blue Mountains Obs] Message sent to observers

· observed from 07:46 to 17:30UT 06/14 and a part session started 07:59UT 06/19. [2010-06-20 07:17, Blue Mountains Obs]

· observed from 7:59 to 17:50UT 06/12 in good condition. no deviation noted. only 1 background star causing loss of data. Also included is observation for half night due to software glitch. Observation was done from 11 to 15:27UT 06/11. Data submitted. [2010-06-12 22:39, Blue Mountains Obs] Message sent to observers

· observed from 10 to 18UT 06/10 in excellent condition with only a very faint background star effecting the data. Period of 3.807h is more likely. [2010-06-11 13:11, Blue Mountains Obs]

· observed from 12 to 17:36 06/09 UT in good condition. data sent in. [2010-06-10 12:17, Blue Mountains Obs] Message sent to observers

· observed for 7.5 hours from 10.44h 06/08 UT. good data with nice 0.25m amplitude. Period 3.85h . [2010-06-09 11:15, Blue Mountains Obs]

· Observed in it's second apparition. Observed 2010-05-10 and 2010-05-15. Data reveals 2 very good fitting periods/curves of 3.8076 +/- 0.0005hrs and 3.8688 +/- 0.0004hrs, No significant deviations observed. Further data will be required to resolve the period. [2010-05-16 05:00, HuntersHill] Message sent to BinAstPhotSurvey conference

· This returning 'prime suspect' has been observed by Don from Carbuncle Hill (6 nights) and by Walt, John and Dirk from SRO (1 night). Like in the 2006 apparition (which occured near opposite point of its heliocentric orbit, about 180 deg different in mean anomaly), there occured a few deviations by about +/-0.02 mag, which might be rotation of a possible satellite, but no obvious events of depth above the Survey's detection limit of 0.04 mag. In its next apparition in December 2008, it will be seen in position nearly perpendicular to those of 2006 and 2007 apparitions:
2006 Mar-Apr: (12.8 h, -5 deg)
2007 Oct-Nov: ( 0.2 h, 2 deg)
2008 Dec: ( 6.3 h, 28 deg)
so observations in 2008 Dec should be useful to get possible events. To resolve the low-amplitude variation (which may be a rotation of possible satellite), data with errors <=0.01 mag would be, however, needed.

The campaign is over for this apparition. A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
As you can see there, periods estimated from both 2006 and 2007 observations, 3.80840 and 3.80848 h, respectively, agree to within their error bars, and the asteroid showed nearly the same amplitude, 0.34-0.35 mag. Consistent with expectation.
http://www.asu.cas.cz/~asteroid/02501_a7.png
http://www.asu.cas.cz/~ppravec/lohja.png

Cheers, Petr [2007-11-20 14:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working from SRO tonight.

-Walt [2007-11-12 02:27, Sonoita]

· I started this at 22:55, Nov 10 UT. It appears that very shallow attenuations are present, however, no estimation of P_orb is possible yet.
Don [2007-11-10 23:02, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'm doing this again tonight. I think I've beaten it into the ground, so hopefully it will be finished.
Don [2007-11-08 02:48, CarbuncleHill] Message sent to observers

· Started at about 00:40ut.
Don [2007-11-07 01:24, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started the at about 02:40 due to clouds.
Don [2007-11-02 02:51, CarbuncleHill] Message sent to observers

· Observing from 23:00 UT in average conditions. Short session possible only. Michal [2007-10-31 23:05, SkalnatePleso] [Remove]

· I started this at 00:45 UT.
Don [2007-10-21 01:01, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Two new sessions of high quality by David from Hunters Hill and by Peter K. from here taken on the past night didn't show any significant deviation from the 3.8084-h period, see
http://www.asu.cas.cz/~ppravec/lohja.png
Though the systematic deviations by +/-0.02 mag seen in the first five nights remain unexplained, there is no indication of a satellite above the nominal detection limit of the Survey. We consider this one as finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, David and Peter!

Cheers, Petr [2006-04-09 09:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Full night session good data (one bad point - just too close to a neighbouring star) period unchanged and no events indicated. Data sent to Petr.

http://www.david-higgins.com/Astronomy/asteroid/images/2501LC.gif [2006-04-09 02:22, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started run at 09:45UT. Should get a full run if the wind doesn't pick up. Sharing this run with 31383. [2006-04-08 11:20, HuntersHill]

· Good work, David, on this one. And good check of the period and no events present, Peter. Yes, the period of 3.808 h has been uniquely established, and there are no attenuations apparent, so no regular binary detection there. I have, however, wondered why the data show relatively large residuals for such high SNR observations. A more detailed look has suggested that there are present deviations of a systematic character. So, I searched for a second period in the data, and I have indeed found an additional signal at a period of 1.87 h (or 3.74 h, if bi-modal) that may be significant, see
http://www.asu.cas.cz/~ppravec/lohja_nsp2p.png
The lightcurve can be described as a co-addition of two components with the two nearby, but different periods, see following pictures
http://www.asu.cas.cz/~ppravec/lohja_2p.png
http://www.asu.cas.cz/~ppravec/lohja_2p_mainpc.png
http://www.asu.cas.cz/~ppravec/lohja_2p_secondpc.png
Ok, the second component has an amplitude of just 0.04 mag, and it would need to be confirmed and nailed down with more data, preferrably of highest quality possible. It would be also good to cover it from two different stations (on a couple nearby nights), to break any possible interference with Earth's rotation. If/when the second period is confirmed and nailed down, it may become a probable binary, but not a certain binary detection unless we are lucky to get mutual events. In any case, if we work pursue this one, a concetrated work by a couple collaborating stations in best conditions on a few nearby nights should be preferred, as it looks likely that only such concentrated effort may resolve this one well.

Cheers, Petr [2006-04-05 13:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed by David Higgins only and it's finished now. Deviations seen on early nights were not confirmed while all phases have double coverage. It's done for our survey. P = 3.8083 h, ampl. 0.34 mag.

http://www.asu.cas.cz/~asteroid/2501.png

Well done, David!

Peter K. [2006-04-03 09:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed run at 18:00UT. Reasonably good data in the conditions, no deviation seen. I can not see any evidence of a binary nature in my data, resolving a period of 3.8084 +/- 0.0002hrs, amp 0.38 +/- 0.01mag

I think this one is finished and will move onto my next target. Data sent to Petr and Peter.

http://www.david-higgins.com/Astronomy/asteroid/images/2501LC.gif [2006-04-02 22:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started observing 10:00UT April 2 in poor conditions. [2006-04-02 11:50, HuntersHill]

· Finished session at 18:52 UT. Period further refined to 3.80814 +/- 0.00025hrs amp 0.38 +/- 0.01mag. 3 nights now match the lower peak at phase 0.6 and since only 2 data points indicate the higher peak I think this one is possibly done. (I can't find anything obviously wrong with those 2 points but can't rule out a cosmic ray hit or otherwise hot pixel inside the target image)

Data sent to Petr and Peter for analysis.

http://www.david-higgins.com/Astronomy/asteroid/images/2501LC.gif [2006-04-01 21:34, HuntersHill] Message sent to BinAstPhotSurvey conference

· Clouds moved in early in the session. No usuable data at the maxima.

Bob Koff [2006-04-01 13:07, AntelopeHills]

· Started observing at 10:00 UT April 1 [2006-04-01 10:29, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started observing (2501) at 04:00 UT April 1.

Bob Koff [2006-04-01 04:39, AntelopeHills]

· Vishnu and Ron have sent their unpublished data (29 points) from two nights of 2004-11-13.4 and 12-07.2. Searching in a range of +/-10 sigma around the best estimated period of 3.8068 h by David ( http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm ), there is just one period in the 2004 data: 3.8079 h (formal error 0.003 h), amplitude ~0.31 mag, see
http://www.asu.cas.cz/~asteroid/lohja_2004_badlands.png

So, the 2004 data are in a good agreement with the recent result by David, though they obviously are not abundant enough to tell anything on possible deviations from the single periodicity. More observations in the current apparition are needed to check the deviations apparent there in the David's data.

Cheers, Petr [2006-03-31 16:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· A full nights run for a change 10:43UT to 18:18UT. Nothign new revealed with last nights data 'splitting the difference' in the little 'kick'. Some pointing problems and a sparse field limited me to just 2 good comp stars.

3.8068 +/- 0.0005hrs 0.38 +/- 0.02 mag [2006-03-26 21:13, HuntersHill] Message sent to BinAstPhotSurvey conference

· Good work on this one so far, David. Yes, more observations are needed to confirm the interesting deviation. I think that a help by another station that is not busy with other target would be certainly appreciated to help to confirm it; the asteroid is pretty bright and at Dec of -5 deg, so in a reach of many here.

Cheers, Petr [2006-03-26 11:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yet another 1/2 night due to easterly change bringing in cloud around midnight :-(

Data is still good, resolving a period of 3.8065hrs +/- 0.0007hrs with an amplitude of 0.4 +/- 0.01 mag. There is an interesting 'kick' in the plot of one peak of around 0.06 mag but not enough data to say either way.

http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm [2006-03-26 01:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· Anotehr short interupted session but provides a little more coverage and confirms the first nights results. 3.80 +/- 0.002hrs with an amplitude of 0.34 +/- 0.01mag. Plot based on only 41 data points so more data required.

Interestingly this object passed through a Landolt field so all my comp stars are Landolt Standards :-) [2006-03-22 21:31, HuntersHill] Message sent to BinAstPhotSurvey conference

· Just under 2 hours worth of what looks like great data from last night (before clouds shut me down) with my 'new' second hand ST-9E show a very definite period of 3.8hrs with an amplitude of at least 0.3 +/- 0.01mag. [2006-03-22 07:21, HuntersHill] Message sent to BinAstPhotSurvey conference

(6186) Zenon (Finished) - 3-period case, probable ternary [Add new note]
· Our announcement on this one has appeared on CBET 4346, copied below for your convenience.

Cheers, Petr

(6186) ZENON
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; N. Gaftonyuk, Simeiz Observatory; M. Husarik and G. Cervak,
Skalnate Pleso Observatory; and J. Oey, Blue Mountains Observatory, Leura,
NSW, Australia, report that photometric observations taken with a 0.35-m
telescope at the Sopot Observatory in Serbia, a 1.0-m telescope at the Simeiz
Observatory, a 0.61-m telescope at the Skalnate Pleso Observatory, and a
0.35-m telescope at the Blue Mountains Observatory during 2016 Oct. 31-2017
Jan. 1 reveal that minor planet (6186) is a binary system with an orbital
period of 14.392 Â± 0.004 hr. Mutual eclipse/occultation events that are
0.08- to 0.16-magnitude deep indicate a secondary-to-primary mean-diameter
ratio of 0.28 Â± 0.03. The eclipsing/occulting secondary has a synchronous
rotation with an observed lightcurve amplitude of 0.04 mag. Superimposed to
the eclipse/occultation lightcurve are two rotational lightcurves with
periods 2.6832 Â± 0.0002 hr and 3.2981 Â± 0.0002 hr, each with an amplitude
of 0.08 mag; their behavior in the mutual events -- they are present with
unchanged shapes during the events -- indicates that none of them belongs to
the eclipsing/occulting secondary. This suggests that, while one of the
short periods belongs to the primary, the other belongs to a third body in
the system (compare with other cases of this kind in Pravec et al. 2016,
Icarus 267, 267).

2017 January 14 (CBET 4346) Daniel W. E. Green [2017-01-16 06:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have analysed the complete dataset 2016-10-31 to 2017-01-01. There are actually two short-period rotational components; the lc decomposition:
http://www.asu.cas.cz/~asteroid/06186_porb.png
http://www.asu.cas.cz/~asteroid/06186_p1.png
http://www.asu.cas.cz/~asteroid/06186_p2.png
(Note: Periods 1.5*P_1, 2*P_1 and 2*P_2 fit equally well.)
The eclipsing satellite with the orbital period of 14.39 h is apparently synchronous. One of the two short-period rotational components probably belongs to a third body in the system (likely a more distant satellite), though we cannot tell which one (P_1 or P_2) belongs to the distant satellite and which to the primary.

I'm going to draft a CBET announcement.

Cheers, Petr [2017-01-10 14:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 16:00 UT. Gabo [2016-12-23 15:33, SkalnatePleso] [Remove]
Message sent to observers

· New data by Marek Husarik and Gabo Cervak from Skalnate Pleso, by Julian Oey from Leura, and by Nelya Gaftonyuk from Simeiz joined in. Current decomposition:
http://www.asu.cas.cz/~asteroid/06186_porb.png
http://www.asu.cas.cz/~asteroid/06186_p1.png
Both periods appear unique (except for that integer multiples of P_1 are possible as well). However, given the rapid evolution of the event shapes, it would be good to take more data before we publish on CBET. Errors not greater than 0.02 mag and long sessions (for that the event duration is long now) are needed; don't bother in sub-optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-24 0.18 0.250
2016-12-24 14.58 0.250
2016-12-25 4.97 0.250
2016-12-25 19.37 0.250
2016-12-26 9.76 0.250
2016-12-27 0.16 0.250
2016-12-27 14.55 0.250
2016-12-28 4.95 0.250
2016-12-28 19.34 0.250
2016-12-29 9.74 0.250
2016-12-30 0.13 0.250
2016-12-30 14.53 0.250
2016-12-31 4.92 0.250
2016-12-31 19.32 0.250
2017- 1- 1 9.71 0.250
2017- 1- 2 0.11 0.250
2017- 1- 2 14.50 0.250
2017- 1- 3 4.90 0.250
2017- 1- 3 19.29 0.250
2017- 1- 4 9.69 0.250
2017- 1- 5 0.08 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-23 16.98 0.750
2016-12-24 7.37 0.750
2016-12-24 21.77 0.750
2016-12-25 12.16 0.750
2016-12-26 2.56 0.750
2016-12-26 16.95 0.750
2016-12-27 7.35 0.750
2016-12-27 21.74 0.750
2016-12-28 12.14 0.750
2016-12-29 2.53 0.750
2016-12-29 16.93 0.750
2016-12-30 7.32 0.750
2016-12-30 21.72 0.750
2016-12-31 12.11 0.750
2017- 1- 1 2.51 0.750
2017- 1- 1 16.90 0.750
2017- 1- 2 7.30 0.750
2017- 1- 2 21.69 0.750
2017- 1- 3 12.09 0.750
2017- 1- 4 2.48 0.750
2017- 1- 4 16.88 0.750
2017- 1- 5 7.27 0.750

Clear Skies, Petr [2016-12-23 10:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 18:50 UT. Gabo [2016-12-22 18:51, SkalnatePleso] [Remove]
Message sent to observers

· I started this at 16:00 UT. Gabo [2016-12-21 15:52, SkalnatePleso] [Remove]

· Asteroid observed from 21:50 UT. Gabo [2016-12-20 21:49, SkalnatePleso] [Remove]
Message sent to observers

· Started this one at 16:20 UT. Gabo [2016-12-19 16:30, SkalnatePleso] [Remove]

· Object observed from 22:20 UT. Gabo [2016-12-18 22:21, SkalnatePleso] [Remove]
Message sent to observers

· observed from 12/17 10:10UT capturing half of the 0.25 Event [2016-12-18 10:38, Blue Mountains Obs]

· Started observing at 20:15 UT. Gabo [2016-12-17 23:55, SkalnatePleso] [Remove]
Message sent to observers

· This one has been worked by Vladimir Benishek from Sopot on 5 nights and by Nelya Gaftonyuk from Simeiz on 3 nights. I get a binary solution for all but one of the runs:
http://www.asu.cas.cz/~asteroid/06186_porb.png
http://www.asu.cas.cz/~asteroid/06186_p1.png
Note: The apparent evolution of the shapes of the events is OK; note that the observations were spread over more than one month while the geometry changed. The P_1 = 5.366 h is unusually long, but not unheard of.

However, one run showed a more complex behaviour:
http://www.asu.cas.cz/~asteroid/06186_porb_x.png
Vladimir has checked the data and he thinks that it is fine; there was a bright star in the field, but Vladimir says that it should not have affected the asteroid photometry. OK, we will hopefully see in the future whether the two more attenuations (around orbital phases 0.92 and 0.04) in the run are real features (e.g., due to a third body in the system) or an observational artifact.

OK, let's try to confirm the P_orb = 14.4 h solution now. Data with errors <= 0.02 mag and long sessions are needed. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 10.15 0.255
2016-12-18 0.55 0.255
2016-12-18 14.95 0.255
2016-12-19 5.35 0.255
2016-12-19 19.75 0.255
2016-12-20 10.15 0.255
2016-12-21 0.55 0.255
2016-12-21 14.95 0.255
2016-12-22 5.35 0.255
2016-12-22 19.75 0.255
2016-12-23 10.15 0.255
2016-12-24 0.55 0.255
2016-12-24 14.95 0.255
2016-12-25 5.35 0.255
2016-12-25 19.75 0.255
2016-12-26 10.15 0.255
2016-12-27 0.55 0.255
2016-12-27 14.95 0.255
2016-12-28 5.35 0.255
2016-12-28 19.75 0.255
2016-12-29 10.15 0.255
2016-12-30 0.55 0.255
2016-12-30 14.95 0.255
2016-12-31 5.35 0.255
2016-12-31 19.75 0.255
2017- 1- 1 10.15 0.255
2017- 1- 2 0.55 0.255
2017- 1- 2 14.95 0.255
2017- 1- 3 5.35 0.255
2017- 1- 3 19.75 0.255
2017- 1- 4 10.15 0.255
2017- 1- 5 0.55 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 2.82 0.746
2016-12-17 17.22 0.746
2016-12-18 7.62 0.746
2016-12-18 22.02 0.746
2016-12-19 12.42 0.746
2016-12-20 2.82 0.746
2016-12-20 17.22 0.746
2016-12-21 7.62 0.746
2016-12-21 22.02 0.746
2016-12-22 12.42 0.746
2016-12-23 2.82 0.746
2016-12-23 17.22 0.746
2016-12-24 7.62 0.746
2016-12-24 22.02 0.746
2016-12-25 12.42 0.746
2016-12-26 2.82 0.746
2016-12-26 17.22 0.746
2016-12-27 7.62 0.746
2016-12-27 22.02 0.746
2016-12-28 12.42 0.746
2016-12-29 2.82 0.746
2016-12-29 17.22 0.746
2016-12-30 7.62 0.746
2016-12-30 22.02 0.746
2016-12-31 12.42 0.746
2017- 1- 1 2.82 0.746
2017- 1- 1 17.22 0.746
2017- 1- 2 7.62 0.746
2017- 1- 2 22.02 0.746
2017- 1- 3 12.42 0.746
2017- 1- 4 2.82 0.746
2017- 1- 4 17.22 0.746
2017- 1- 5 7.62 0.746

Clear Skies, Petr [2016-12-12 12:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed at Dec 5/6 from 20 to 0 UT. Nelya. [2016-12-06 15:03, Simeiz] Message sent to observers

· Started my telescope at 17:15 UT. Gabo [2016-12-05 17:23, SkalnatePleso] [Remove]

· Planning to start at Dec 2, 23:00 UT.
Don [2016-12-02 22:51, Sugarloaf] Message sent to observers

· Ran last night only from 0020-0345 UT. Drive problems prevented longer run. Will try again tonight. Joe [2016-11-05 14:01, Dark Sky & PROMPT]

· Another session obtained last night (Nov. 04-05, 18:34-02:53 UT).

Vladimir [2016-11-05 12:05, Sopot AO] Message sent to observers

· Began run from DSO at 0020 UT. Hope to get about 10 hours. Joe [2016-11-05 01:41, Dark Sky & PROMPT]

· Vladimir Benishek took first two nights for this new target from Sopot. Revealed a suspect behaviour; the data don't fit well with any reasonable period. A formal best fit (but it is likely wrong):
http://www.asu.cas.cz/~asteroid/06186.png
We suspect that there is actually more than one component in the lc. Unfortunately Vladimir will be likely clouded out on coming nights, so we ask others here for help (or maybe effectively a take over).

Clear Skies, Petr [2016-11-01 09:28, Ondrejov] Message sent to BinAstPhotSurvey conference

(12326) Shirasaki (Finished) - binary, possible ternary [Add new note]
· Our report on this one has appeared on CBET 4345, copied below for your convenience.

Cheers, Petr

(12326) SHIRASAKI
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; V. Benishek, Belgrade Astronomical
Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia;
and V. Chiorny, Kharkiv Observatory, report that photometric observations
taken with a 0.50-m telescope at the Sugarloaf Mountain Observatory, a
0.35-m telescope at the Sopot Observatory in Serbia, a 0.35-m telescope at
the Blue Mountains Observatory, and a 0.70-m telescope at the Chuguev
station of the Kharkiv Observatory in Ukraine during 2016 Nov. 5-Dec. 6
reveal that minor planet (12326) is a binary system with an orbital period
of 25.06 Â± 0.02 hr. The primary shows a period of 2.7286 Â± 0.0001 hr
and has a lightcurve amplitude of 0.12 mag at solar phases 5-7 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events
that are 0.06- to 0.12-magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.24. Superimposed to the
primary and the eclipse/occultation lightcurves is a second rotational
lightcurve with a period of 12.7 Â± 0.1 hr, derived assuming two pairs
of maxima/minima per period, and an observed lightcurve amplitude of
0.03-0.04 mag. It remains to be seen from future studies whether the
second rotational lightcurve belongs to the eclipsing/occulting secondary
or a possible third body in the system.

2017 January 12 (CBET 4345) Daniel W. E. Green [2017-01-13 07:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations finished. [2017-01-11 10:05, Ondrejov]

· Started this at 22:45, Dec 25 UT, and hope to catch the 0.215 phase event. [2016-12-26 01:03, Sugarloaf] Message sent to observers

· Data obtained so far for this one:
http://www.asu.cas.cz/~asteroid/12326_2016a_porb.png
http://www.asu.cas.cz/~asteroid/12326_2016a_p1.png
http://www.asu.cas.cz/~asteroid/12326_2016a_p2.png
http://www.asu.cas.cz/~asteroid/12326_2016a_p2_nsp.png
http://www.asu.cas.cz/~asteroid/12326_2016b_porb.png
http://www.asu.cas.cz/~asteroid/12326_2016b_p1.png
http://www.asu.cas.cz/~asteroid/12326_2016b_p2.png
http://www.asu.cas.cz/~asteroid/12326_2016b_p2_nsp.png

The solution looks good, except for the anomalously deep and wide attenuation observed by Vladimir Benishek on 11-29.9. (Vladimir sees nothing suspicious with this his data.) OK, we should see what it means in the future. However, before we publish this one on CBET it would be still good to take more data to confirm the solution. Errors <= 0.02 mag and long sessions are needed. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 17.20 0.215
2016-12-18 18.30 0.215
2016-12-19 19.40 0.215
2016-12-20 20.50 0.215
2016-12-21 21.60 0.215
2016-12-22 22.70 0.215
2016-12-23 23.80 0.215
2016-12-25 0.90 0.215
2016-12-26 2.00 0.215
2016-12-27 3.10 0.215
2016-12-28 4.20 0.215
2016-12-29 5.30 0.215
2016-12-30 6.40 0.215
2016-12-31 7.50 0.215
2017- 1- 1 8.60 0.215
2017- 1- 2 9.70 0.215
2017- 1- 3 10.80 0.215
2017- 1- 4 11.90 0.215
2017- 1- 5 13.00 0.215

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 4.83 0.722
2016-12-18 5.93 0.722
2016-12-19 7.03 0.722
2016-12-20 8.13 0.722
2016-12-21 9.23 0.722
2016-12-22 10.33 0.722
2016-12-23 11.43 0.722
2016-12-24 12.53 0.722
2016-12-25 13.63 0.722
2016-12-26 14.73 0.722
2016-12-27 15.83 0.722
2016-12-28 16.93 0.722
2016-12-29 18.03 0.722
2016-12-30 19.13 0.722
2016-12-31 20.23 0.722
2017- 1- 1 21.33 0.722
2017- 1- 2 22.43 0.722
2017- 1- 3 23.53 0.722
2017- 1- 5 0.63 0.722

Clear Skies, Petr [2016-12-12 13:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:00 UT, and hope to catch the 0.245 phase event.
Don [2016-12-06 00:51, Sugarloaf] Message sent to observers

· observed on 12/02 from 12 UT and caught part of 0.75 phase event. [2016-12-05 22:06, Blue Mountains Obs]

· Started on Dec 4, 23:40 UT. and hope to catch the 0.245 phase event.
Don [2016-12-05 00:35, Sugarloaf] Message sent to observers

· observed on 12/02 from 12 UT and caught part of 0.75 phase event. [2016-12-03 07:22, Blue Mountains Obs]

· Started this at Dec 2, 22:40 UT, and hope to catch the 0.245 phase event.
Don [2016-12-02 22:48, Sugarloaf] Message sent to observers

· More data by Don Pray from Sugarloaf Mountain, by Vasilij Chiorny from Kharkiv, by Vladimir Benishek from Sopot, and by Julian Oey from Leura indicate that it is the orbital period 25 hours. However, the apparent rapid event evolution is interesting. It would be good to obtain more data before we publish this one on CBET, to hopefully get some understanding of the behaviour. LC decomposition:
http://www.asu.cas.cz/~asteroid/12326_2016a_porb.png
http://www.asu.cas.cz/~asteroid/12326_2016a_p1.png
http://www.asu.cas.cz/~asteroid/12326_2016a_p2.png
http://www.asu.cas.cz/~asteroid/12326_2016b_porb.png
http://www.asu.cas.cz/~asteroid/12326_2016b_p1.png
http://www.asu.cas.cz/~asteroid/12326_2016b_p2.png

Errors <= 0.02 mag and long sessions are needed. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12- 3 1.10 0.245
2016-12- 4 2.14 0.245
2016-12- 5 3.18 0.245
2016-12- 6 4.22 0.245
2016-12- 7 5.26 0.245
2016-12- 8 6.30 0.245
2016-12- 9 7.34 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2016-12- 2 13.43 0.779
2016-12- 3 14.47 0.779
2016-12- 4 15.51 0.779
2016-12- 5 16.55 0.779
2016-12- 6 17.59 0.779
2016-12- 7 18.63 0.779
2016-12- 8 19.67 0.779

Clear Skies, Petr [2016-12-02 12:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· captured phase 0.75 at 13UT on 12/01 [2016-12-02 11:03, Blue Mountains Obs] Message sent to observers

· Observed on 22/23 Nov from 21:20 UT to 02:30 UT. Vasilij Ch. [2016-11-23 02:45, Kharkiv]

· Started a run at 01:00 UT.
Don [2016-11-23 00:57, Sugarloaf]

· observed from 12:11 to 15:07 11/21 UT capturing 0.252phase. [2016-11-22 00:25, Blue Mountains Obs] Message sent to observers

· Started a run at 23:40, Nov 18 UT, and will cover much of the possible 0.752 phase event.
Don [2016-11-18 23:41, Sugarloaf]

· Fifth session by Don Pray from Sugarloaf Mountain joined in:
http://www.asu.cas.cz/~asteroid/12326_2016a_p1.png
http://www.asu.cas.cz/~asteroid/12326_2016a_p2.png
http://www.asu.cas.cz/~asteroid/12326_2016a_porb.png

More data for both events are needed. Below is an event ephemeris for the 25.1-h orbital period; if it is the 50-h period, only the 0.25-phase events will occur.

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 11.33 0.252
2016-11-19 12.43 0.252
2016-11-20 13.53 0.252
2016-11-21 14.63 0.252
2016-11-22 15.73 0.252
2016-11-23 16.83 0.252
2016-11-24 17.93 0.252
2016-11-25 19.03 0.252
2016-11-26 20.13 0.252
2016-11-27 21.23 0.252
2016-11-28 22.33 0.252
2016-11-29 23.43 0.252
2016-12- 1 0.53 0.252
2016-12- 2 1.63 0.252
2016-12- 3 2.73 0.252
2016-12- 4 3.83 0.252
2016-12- 5 4.93 0.252
2016-12- 6 6.03 0.252
2016-12- 7 7.13 0.252
2016-12- 8 8.23 0.252
2016-12- 9 9.33 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 23.87 0.752
2016-11-20 0.97 0.752
2016-11-21 2.07 0.752
2016-11-22 3.17 0.752
2016-11-23 4.27 0.752
2016-11-24 5.37 0.752
2016-11-25 6.47 0.752
2016-11-26 7.57 0.752
2016-11-27 8.67 0.752
2016-11-28 9.77 0.752
2016-11-29 10.87 0.752
2016-11-30 11.97 0.752
2016-12- 1 13.07 0.752
2016-12- 2 14.17 0.752
2016-12- 3 15.27 0.752
2016-12- 4 16.37 0.752
2016-12- 5 17.47 0.752
2016-12- 6 18.57 0.752
2016-12- 7 19.67 0.752
2016-12- 8 20.77 0.752

Clear Skies, Petr [2016-11-13 12:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:20 to cover the 0.262 phase event.
Don [2016-11-10 01:34, Sugarloaf] Message sent to observers

· Don Pray has captured another event. Current lc decomposition (still somewhat tentative):
http://www.asu.cas.cz/~asteroid/12326_2016a_p1.png
http://www.asu.cas.cz/~asteroid/12326_2016a_p2.png
http://www.asu.cas.cz/~asteroid/12326_2016a_porb.png
The orbital period is ~25.2 or ~50.4 h. Below is an event ephemeris for the shorter one. Critical for resolving the ambiguity will be to cover the predicted times for the 0.75-phase event: If there is an event, it is the shorter orbital period. If there is no event, it is the longer orbital period. Unfortunately the critical times are outside Don's nightly observing window now .... (But it will drift to his window after the full moon so he may resolve the ambiguity then, unless someone else resolves it sooner.)

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-10 2.68 0.249
2016-11-11 3.88 0.249
2016-11-12 5.08 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-10 15.27 0.749
2016-11-11 16.47 0.749
2016-11-12 17.67 0.749

Clear Skies, Petr [2016-11-10 00:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:25 UT, and hope to get several hours before clouds arrive.
Don [2016-11-09 00:45, Sugarloaf]

· Don Pray took first three nights for this new target. Captured an apparent attenuation. There appears to be also a second, low-amplitude rotational component; a tentative decomposition:
http://www.asu.cas.cz/~asteroid/12326_2016a_p1.png
http://www.asu.cas.cz/~asteroid/12326_2016a_p2.png
http://www.asu.cas.cz/~asteroid/12326_2016a_porb.png
(The orbital period has not been determined of course, it's an arbitrary value set just for plotting purpose in the last picture above.)

More data are needed to confirm and derive orbital period. Errors < 0.03 mag and a minimum session duration of 2 hours are needed.

Clear Skies, Petr [2016-11-08 22:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began a run at 00:15 UT.
Don [2016-11-08 02:34, Sugarloaf]

· Did a run on this new target on Nov 5.
Don [2016-11-06 19:22, Sugarloaf]

(57292) 2001 QV174 (Finished) [Add new note]
· Roger Groom and Julian Oey did this new target from Perth and Leura: An U = 2+ solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/57292.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-01-11 11:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 12/02,12/14,12/06 and 12/07. [2016-12-08 00:10, Blue Mountains Obs] Message sent to observers

· starting observation from 14:41 UT 12/01 [2016-12-02 11:35, Blue Mountains Obs]

· Starting this new target 11/27 [2016-11-28 01:48, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(15202) YamadaHoukoku (Finished) [Add new note]
· A number of periods possible, it's an insufficient solution for the BinAstPhotSurvey. Petr [2017-01-11 10:04, Ondrejov]

· observed on 12/25, 12/26. period is 26.3h [2016-12-31 01:51, Blue Mountains Obs] Message sent to observers

· observed on 12/24 [2016-12-25 06:28, Blue Mountains Obs]

· observed 12/02,12/09,12/19,12/20. [2016-12-21 00:11, Blue Mountains Obs]

· start a new target 01/12 from 15:15 UT [2016-12-02 11:24, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5112) Kusaji (Finished) - binary [Add new note]
· Discovery apparition finished. [2017-01-10 11:11, Ondrejov]

· New data were taken by Vasilij Chiorny from Kharkiv, by Hana Kucakova and Kamil Hornoch from here, and by Fred Vachier with the telescope in Reunion:
http://www.asu.cas.cz/~asteroid/05112_2016b_porb.png
http://www.asu.cas.cz/~asteroid/05112_2016b_p1.png
http://www.asu.cas.cz/~asteroid/05112_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05112_2016a_p1.png

Last data for this discovery apparition would be useful for future modeling. Errors <= 0.03 mag are needed and long runs are preferred. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 7.23 0.244
2016-12-18 3.97 0.244
2016-12-19 0.71 0.244
2016-12-19 21.45 0.244
2016-12-20 18.19 0.244
2016-12-21 14.93 0.244
2016-12-22 11.67 0.244
2016-12-23 8.41 0.244
2016-12-24 5.15 0.244
2016-12-25 1.89 0.244
2016-12-25 22.63 0.244
2016-12-26 19.37 0.244
2016-12-27 16.11 0.244
2016-12-28 12.85 0.244
2016-12-29 9.59 0.244
2016-12-30 6.33 0.244
2016-12-31 3.07 0.244
2016-12-31 23.81 0.244
2017- 1- 1 20.55 0.244
2017- 1- 2 17.29 0.244
2017- 1- 3 14.03 0.244
2017- 1- 4 10.77 0.244
2017- 1- 5 7.51 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 17.71 0.750
2016-12-18 14.45 0.750
2016-12-19 11.19 0.750
2016-12-20 7.93 0.750
2016-12-21 4.67 0.750
2016-12-22 1.41 0.750
2016-12-22 22.15 0.750
2016-12-23 18.89 0.750
2016-12-24 15.63 0.750
2016-12-25 12.37 0.750
2016-12-26 9.11 0.750
2016-12-27 5.85 0.750
2016-12-28 2.59 0.750
2016-12-28 23.33 0.750
2016-12-29 20.07 0.750
2016-12-30 16.81 0.750
2016-12-31 13.55 0.750
2017- 1- 1 10.29 0.750
2017- 1- 2 7.03 0.750
2017- 1- 3 3.77 0.750
2017- 1- 4 0.51 0.750
2017- 1- 4 21.25 0.750

Clear Skies, Petr [2016-12-09 12:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed tonight 23/24 Nov from 22:25 UT to 01:15 UT to capture event 0.242 phase.
Vasilij Ch. [2016-11-24 03:30, Kharkiv] Message sent to observers

· Observed the event at 0.746 phase from 15:00 to 18:30 UT.
Vasilij Ch. [2016-11-22 23:38, Kharkiv]

· Current data for this one:
http://www.asu.cas.cz/~asteroid/05112_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05112_2016a_p1.png

Monitoring events would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 18.77 0.242
2016-11-19 15.51 0.242
2016-11-20 12.25 0.242
2016-11-21 8.99 0.242
2016-11-22 5.73 0.242
2016-11-23 2.47 0.242
2016-11-23 23.21 0.242
2016-11-24 19.95 0.242
2016-11-25 16.69 0.242
2016-11-26 13.43 0.242
2016-11-27 10.17 0.242
2016-11-28 6.91 0.242
2016-11-29 3.65 0.242
2016-11-30 0.39 0.242
2016-11-30 21.13 0.242
2016-12- 1 17.87 0.242
2016-12- 2 14.61 0.242
2016-12- 3 11.35 0.242
2016-12- 4 8.09 0.242
2016-12- 5 4.83 0.242
2016-12- 6 1.57 0.242
2016-12- 6 22.31 0.242
2016-12- 7 19.05 0.242
2016-12- 8 15.79 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 8.47 0.746
2016-11-19 5.21 0.746
2016-11-20 1.95 0.746
2016-11-20 22.69 0.746
2016-11-21 19.43 0.746
2016-11-22 16.17 0.746
2016-11-23 12.91 0.746
2016-11-24 9.65 0.746
2016-11-25 6.39 0.746
2016-11-26 3.13 0.746
2016-11-26 23.87 0.746
2016-11-27 20.61 0.746
2016-11-28 17.35 0.746
2016-11-29 14.09 0.746
2016-11-30 10.83 0.746
2016-12- 1 7.57 0.746
2016-12- 2 4.31 0.746
2016-12- 3 1.05 0.746
2016-12- 3 21.79 0.746
2016-12- 4 18.53 0.746
2016-12- 5 15.27 0.746
2016-12- 6 12.01 0.746
2016-12- 7 8.75 0.746
2016-12- 8 5.49 0.746

Clear Skies, Petr [2016-11-11 20:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our report on this one has appeared on CBET 4336, copied below for your convenience.

Cheers, Petr

(5112) KUSAJI
V. Chiorny, Kharkiv Observatory; P. Pravec, Ondrejov Observatory; D.
Romeuf, Lyon University; R. Montaigut, A. Leroy, and C. Gillier, OPERA
Observatory, France; V. Benishek, Belgrade Astronomical Observatory; A.
Marchini, R. Papini, and F. Salvaggio, Dipartimento di Scienze Fisiche, Della
Terra e Dell'Ambiente, University of Siena; and J. Oey, Blue Mountains
Observatory, Leura, NSW, Australia, report that photometric observations taken
with a 0.70-m telescope at the Chuguev station of the Kharkiv Observatory in
Ukraine, a 0.36-m telescope at Pommier Observatory in France, a 0.20-m
telescope at the OPERA Observatory, a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.30-m telescope at the Astronomical Observatory of
the University of Siena, and a 0.61-m telescope at the Blue Mountains
Observatory during 2016 Oct. 25 to Nov. 1 reveal that minor planet (5112) is
a binary system with an orbital period of 20.74 Â± 0.01 hr. The primary
shows a period of 2.7995 Â± 0.0001 hr and has a lightcurve amplitude of 0.12
mag at solar phases 4-8 degrees, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.10- to 0.17-magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.31 Â± 0.02. The
secondary's rotation appears synchronous with the orbital motion and it has a
lightcurve amplitude of 0.02-0.03 mag in the combined primary-plus-secondary
lightcurve, suggesting a moderately elongated secondary shape with the
equatorial axis ratio being about 1.3.

2016 November 10 (CBET 4336) Daniel W. E. Green [2016-11-10 12:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting new session at 00.35h in order to cover an event. [2016-11-08 00:06, IAO-Isaac Aznar Obs.] Message sent to observers

· Starting new session of (5112) Kusaji at 23.30 UT. [2016-11-06 23:29, IAO-Isaac Aznar Obs.]

· observed from 12:40 11/03 UT to capture the 0.74 phase event [2016-11-04 00:25, Blue Mountains Obs] Message sent to observers

· Current data for this one:
http://www.asu.cas.cz/~asteroid/05112_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05112_2016a_p1.png
It's about ready to be submitted to CBET.

More data are still needed to refine the solution and to monitor events evolution; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11- 2 8.71 0.242
2016-11- 3 5.45 0.242
2016-11- 4 2.19 0.242
2016-11- 4 22.93 0.242
2016-11- 5 19.67 0.242
2016-11- 6 16.41 0.242
2016-11- 7 13.15 0.242
2016-11- 8 9.89 0.242
2016-11- 9 6.63 0.242
2016-11-10 3.37 0.242
2016-11-11 0.11 0.242
2016-11-11 20.85 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2016-11- 2 19.15 0.746
2016-11- 3 15.89 0.746
2016-11- 4 12.63 0.746
2016-11- 5 9.37 0.746
2016-11- 6 6.11 0.746
2016-11- 7 2.85 0.746
2016-11- 7 23.59 0.746
2016-11- 8 20.33 0.746
2016-11- 9 17.07 0.746
2016-11-10 13.81 0.746
2016-11-11 10.55 0.746

Clear Skies, Petr [2016-11-02 07:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 11/01 starting 11:51 UT [2016-11-02 01:05, Blue Mountains Obs] Message sent to observers

· Romain Montaigut, Arnaud Leroy and Christophe Gillier from OPERA, Vladimir Benishek from Sopot, and Alessandro Marchini, Fabio Salvaggio and Riccardo Papini from Siena all resolved the P_orb ambiguity: It's 20.76 h. Current lc decomposition:
http://www.asu.cas.cz/~asteroid/05112_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05112_2016a_p1.png
(A preliminarily reduced data by Joe Pollock also contained the primary event. They may be added to the solution after re-reduction.)

One more session for each of the two events is needed before we can publish this one on CBET. Errors <= 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-30 18.49 0.238
2016-10-31 15.25 0.238
2016-11- 1 12.01 0.238
2016-11- 2 8.77 0.238
2016-11- 3 5.53 0.238
2016-11- 4 2.29 0.238
2016-11- 4 23.05 0.238
2016-11- 5 19.81 0.238
2016-11- 6 16.57 0.238
2016-11- 7 13.33 0.238
2016-11- 8 10.09 0.238
2016-11- 9 6.85 0.238
2016-11-10 3.61 0.238
2016-11-11 0.37 0.238
2016-11-11 21.13 0.238

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-31 5.02 0.745
2016-11- 1 1.78 0.745
2016-11- 1 22.54 0.745
2016-11- 2 19.30 0.745
2016-11- 3 16.06 0.745
2016-11- 4 12.82 0.745
2016-11- 5 9.58 0.745
2016-11- 6 6.34 0.745
2016-11- 7 3.10 0.745
2016-11- 7 23.86 0.745
2016-11- 8 20.62 0.745
2016-11- 9 17.38 0.745
2016-11-10 14.14 0.745
2016-11-11 10.90 0.745

Clear Skies, Petr [2016-10-30 15:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from Siena, 19:00-04:30 UT. Alessandro [2016-10-30 05:34, Univ-Siena IT]

· Observed on Oct. 28-29-30 from Obs Pommier [2016-10-29 20:59, K11 Obs Pommier] Message sent to observers

· Observed on Oct. 28-29 from Siena too, 19:50-04:30 UT.
Alessandro [2016-10-29 14:05, Univ-Siena IT] Message sent to BinAstPhotSurvey conference

· Observed from Sopot on Oct. 28-29, 22:39-02:18 UT.

Vladimir [2016-10-29 13:08, Sopot AO]

· Observed from Dark Sky last night from 0300-0900 UT. Event occurred centered about 0415 UT. Joe [2016-10-28 19:39, Dark Sky & PROMPT] Message sent to observers

· Vasilij Chiorny took a third night for this one. It's an orbital period of 20.7 h or 41.4 h; a preliminary lc decomposition for the shorter period:
http://www.asu.cas.cz/~asteroid/05112_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05112_2016a_p1.png

Below is an event ephemeris for the 20.7-h period. Critical for resolving the ambiguity will be observations around the predicted times for the 0.246-phase events. If there are events, it's the 20.7-h period. If they are not there, it's 41.4 h.

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-29 0.96 0.246
2016-10-29 21.66 0.246
2016-10-30 18.36 0.246
2016-10-31 15.06 0.246
2016-11- 1 11.76 0.246
2016-11- 2 8.46 0.246
2016-11- 3 5.16 0.246
2016-11- 4 1.86 0.246
2016-11- 4 22.56 0.246
2016-11- 5 19.26 0.246
2016-11- 6 15.96 0.246
2016-11- 7 12.66 0.246
2016-11- 8 9.36 0.246
2016-11- 9 6.06 0.246
2016-11-10 2.76 0.246
2016-11-10 23.46 0.246
2016-11-11 20.16 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-28 14.60 0.746
2016-10-29 11.30 0.746
2016-10-30 8.00 0.746
2016-10-31 4.70 0.746
2016-11- 1 1.40 0.746
2016-11- 1 22.10 0.746
2016-11- 2 18.80 0.746
2016-11- 3 15.50 0.746
2016-11- 4 12.20 0.746
2016-11- 5 8.90 0.746
2016-11- 6 5.60 0.746
2016-11- 7 2.30 0.746
2016-11- 7 23.00 0.746
2016-11- 8 19.70 0.746
2016-11- 9 16.40 0.746
2016-11-10 13.10 0.746
2016-11-11 9.80 0.746

Clear Skies, Petr [2016-10-28 06:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vasilij Chiorny found this new target to be a binary suspect. A tentative decomposition of his data:
http://www.asu.cas.cz/~asteroid/05112_2016a_porb.png
http://www.asu.cas.cz/~asteroid/05112_2016a_p1.png
(P_orb has not been determined; the value used above is arbitrary, set just for plotting purpose.)

More data are obviously needed; I encourage others here to help out Vasilij.

Clear Skies, Petr [2016-10-27 02:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed new target on 24/25 Oct about 4 hr and 25/26 Oct about 8.5 hr. Period 2.8 hr. Amplitude 0.12 mag.
Clearly seem attenuation deep of 0.2 mag at 00:30 UT 26 Oct
Vasilij Ch. [2016-10-26 17:01, Kharkiv] Message sent to BinAstPhotSurvey conference

(3073) Kursk (Finished) - return binary [Add new note]
· Closed for this 3rd apparition. [2017-01-10 10:31, Ondrejov]

· New data for this one were taken by Don Pray from Sugarloaf Mountain, by Vasilij Chiorny from Kharkiv, by Vladimir Benishek from Sopot, and by Nelya Gaftonyuk from Simeiz:
http://www.asu.cas.cz/~asteroid/03073_2016b_porb.png
http://www.asu.cas.cz/~asteroid/03073_2016b_p1.png
http://www.asu.cas.cz/~asteroid/03073_2016a_porb.png
http://www.asu.cas.cz/~asteroid/03073_2016a_p1.png

Last data for this lunation would be useful for modeling for our prepared paper. Errors < 0.02 mag are needed and a coverage of any phase (with the minimum session duration of 3.5 h) will be good; we need to cover also the primary lc outside events. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-18 4.16 0.258
2016-12-20 1.12 0.258
2016-12-21 22.08 0.258
2016-12-23 19.04 0.258
2016-12-25 16.00 0.258
2016-12-27 12.96 0.258
2016-12-29 9.92 0.258
2016-12-31 6.88 0.258
2017- 1- 2 3.84 0.258
2017- 1- 4 0.80 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 5.62 0.757
2016-12-19 2.58 0.757
2016-12-20 23.54 0.757
2016-12-22 20.50 0.757
2016-12-24 17.46 0.757
2016-12-26 14.42 0.757
2016-12-28 11.38 0.757
2016-12-30 8.34 0.757
2017- 1- 1 5.30 0.757
2017- 1- 3 2.26 0.757
2017- 1- 4 23.22 0.757

Clear Skies, Petr [2016-12-09 11:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning this one, and start tonight Dec 8, 16:00 UT [2016-12-08 12:03, Les Makes]

· I observed at Dec 5/6 from 16 to 20 UT outside events.
Nelya. [2016-12-06 15:01, Simeiz] Message sent to observers

· Planning to start this one at Dec 2, 23:00 UT to catch the 0.256 phase event.
Don [2016-12-02 22:50, Sugarloaf]

· Observed on Nov. 24-25, 17:04-00:58 UT.

Vladimir [2016-11-25 10:32, Sopot AO] Message sent to observers

· I plan observations about 4.5 hr from 17:40 UT.
Vasilij Ch. [2016-11-23 17:36, Kharkiv]

· Our current data for this one:
http://www.asu.cas.cz/~asteroid/03073_2016b_porb.png
http://www.asu.cas.cz/~asteroid/03073_2016b_p1.png
http://www.asu.cas.cz/~asteroid/03073_2016a_porb.png
http://www.asu.cas.cz/~asteroid/03073_2016a_p1.png

We need to take more data in this lunation (for a modeling for our prepared paper Scheirich et al., "Binary asteroid
population 4. Asymmetries in the orbital pole distribution"), but it's uncertain whether we succeed due to a combination of poor weather and other scheduled programs at the 0.65-m here. A help by other station(s) would be appreciated. Errors < 0.02 mag are needed and a coverage of any phase (with the minimum session duration of 3.5 h) will be good; we need to cover also the primary lc outside events. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-23 19.59 0.256
2016-11-25 16.55 0.256
2016-11-27 13.51 0.256
2016-11-29 10.47 0.256
2016-12- 1 7.43 0.256
2016-12- 3 4.39 0.256
2016-12- 5 1.35 0.256
2016-12- 6 22.31 0.256
2016-12- 8 19.27 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-24 18.05 0.756
2016-11-26 15.01 0.756
2016-11-28 11.97 0.756
2016-11-30 8.93 0.756
2016-12- 2 5.89 0.756
2016-12- 4 2.85 0.756
2016-12- 5 23.81 0.756
2016-12- 7 20.77 0.756

Clear Skies, Petr [2016-11-23 10:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our current data for this binary:
http://www.asu.cas.cz/~asteroid/03073_2016_porb.png
http://www.asu.cas.cz/~asteroid/03073_2016_p1.png

More data are needed so that we can hopefully create its model. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 4.23 0.245
2016-11-20 1.19 0.245
2016-11-21 22.15 0.245
2016-11-23 19.11 0.245
2016-11-25 16.07 0.245
2016-11-27 13.03 0.245
2016-11-29 9.99 0.245
2016-12- 1 6.95 0.245
2016-12- 3 3.91 0.245
2016-12- 5 0.87 0.245
2016-12- 6 21.83 0.245
2016-12- 8 18.79 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-19 2.69 0.745
2016-11-20 23.65 0.745
2016-11-22 20.61 0.745
2016-11-24 17.57 0.745
2016-11-26 14.53 0.745
2016-11-28 11.49 0.745
2016-11-30 8.45 0.745
2016-12- 2 5.41 0.745
2016-12- 4 2.37 0.745
2016-12- 5 23.33 0.745
2016-12- 7 20.29 0.745

Clear Skies, Petr [2016-11-11 00:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hana Kucakova, Peter Kusnirak and Kamil Hornoch took first data for this return binary in its current 3rd apparition:
http://www.asu.cas.cz/~asteroid/03073_2016_porb.png
http://www.asu.cas.cz/~asteroid/03073_2016_p1.png

More data are needed so that we can hopefully create its model. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11- 6 0.13 0.240
2016-11- 7 21.09 0.240
2016-11- 9 18.05 0.240
2016-11-11 15.01 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2016-11- 6 22.63 0.740
2016-11- 8 19.59 0.740
2016-11-10 16.55 0.740

Clear Skies, Petr [2016-11-05 14:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done for the 2nd apparition; data from a 3rd one will be needed for modeling. Petr [2014-03-14 14:06, Ondrejov]

· I started this one at 23:50, Mar 6 UT, and should catch the 0.250 phase event.
Don [2014-03-07 00:57, Sugarloaf] Message sent to observers

· Just began observing from Prompt Tololo. Hope to cover the 0.745 phase event at 0212 UT. Joe [2014-02-21 00:44, Dark Sky & PROMPT]

· Just began observing from Prompt Tololo. Hope to cover the 0.250 phase event at 0400 UT. Joe [2014-02-20 00:25, Dark Sky & PROMPT] Message sent to observers

· It would be useful to try to get more data for this binary; events ephemeris (but see my comments of January 7 below):

Date/Time UTC (LTc.) Phase
--------------------------
2014- 2-18 7.01 0.250
2014- 2-20 3.97 0.250
2014- 2-22 0.93 0.250
2014- 2-23 21.89 0.250
2014- 2-25 18.85 0.250
2014- 2-27 15.81 0.250
2014- 3- 1 12.77 0.250
2014- 3- 3 9.73 0.250
2014- 3- 5 6.69 0.250
2014- 3- 7 3.65 0.250
2014- 3- 9 0.61 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014- 2-19 5.25 0.745
2014- 2-21 2.21 0.745
2014- 2-22 23.17 0.745
2014- 2-24 20.13 0.745
2014- 2-26 17.09 0.745
2014- 2-28 14.05 0.745
2014- 3- 2 11.01 0.745
2014- 3- 4 7.97 0.745
2014- 3- 6 4.93 0.745
2014- 3- 8 1.89 0.745

Clear Skies, Petr [2014-02-12 09:01, Ondrejov]

· Doing a few hours on this one, and should catch the last third of the 0.250 phase event.
Don [2014-01-08 03:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Joe Pollock took first data (five nights) with Prompt and the Perth telescope for this return binary in its current (our first post-discovery) apparition, captured events around orbital phase 0.25 and ~0.74:
http://www.asu.cas.cz/~asteroid/03073_14a_porb.png
http://www.asu.cas.cz/~asteroid/03073_14a_p1.png
There are unexpected features around orbital phases 0.16 and 0.63; they resemble "secondary" events (of "double" events), but such shouldn't occur there in the current geometry. More and high-quality data (errors 0.01 mag) are needed. Following ephemeris is for the "main" events:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 1- 8 1.89 0.250
2014- 1- 9 22.85 0.250
2014- 1-11 19.81 0.250
2014- 1-21 4.61 0.250
2014- 1-23 1.57 0.250
2014- 1-24 22.53 0.250
2014- 1-26 19.49 0.250
2014- 1-28 16.45 0.250
2014- 1-30 13.41 0.250
2014- 2- 1 10.37 0.250
2014- 2- 3 7.33 0.250
2014- 2- 5 4.29 0.250
2014- 2- 7 1.25 0.250
2014- 2- 8 22.21 0.250
2014- 2-10 19.17 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014- 1- 8 23.91 0.740
2014- 1-10 20.87 0.740
2014- 1-12 17.83 0.740
2014- 1-20 5.67 0.740
2014- 1-22 2.63 0.740
2014- 1-23 23.59 0.740
2014- 1-25 20.55 0.740
2014- 1-27 17.51 0.740
2014- 1-29 14.47 0.740
2014- 1-31 11.43 0.740
2014- 2- 2 8.39 0.740
2014- 2- 4 5.35 0.740
2014- 2- 6 2.31 0.740
2014- 2- 7 23.27 0.740
2014- 2- 9 20.23 0.740

Clear Skies, Petr [2014-01-07 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 03:10 UT.
Don [2014-01-04 01:17, Sugarloaf]

· The campaign is over. Petr [2007-02-26 08:30, Ondrejov]

· Started a run at 23:20, Jan 11, to catch the 2:48 Jan 12 ut event. Clouds may stop this early.
Don [2007-01-12 00:58, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· For a case someone takes follow up observations for the binary with errors not greater than 0.02 mag in this lunation, I am putting here an ephemeris for the events. The events were more than 4 hours long in the past lunation, and they may further widen with increasing solar phase in the current lunation, so it would be good to observe at times as distant as plus or minus a few hours from the predicted times. Checking an evolution of the primary lightcurve would be needed anyway, so taking some data also outside events would be needed too. So, follow up observations shouldn't be confined too narrowly just on the events.

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 1- 8 8.88 0.256
2007- 1-10 5.84 0.256
2007- 1-12 2.80 0.256
2007- 1-13 23.76 0.256
2007- 1-15 20.72 0.256
2007- 1-17 17.68 0.256
2007- 1-19 14.64 0.256
2007- 1-21 11.60 0.256
2007- 1-23 8.56 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2007- 1- 7 10.34 0.755
2007- 1- 9 7.30 0.755
2007- 1-11 4.26 0.755
2007- 1-13 1.22 0.755
2007- 1-14 22.18 0.755
2007- 1-16 19.14 0.755
2007- 1-18 16.10 0.755
2007- 1-20 13.06 0.755
2007- 1-22 10.02 0.755
2007- 1-24 6.98 0.755 [2007-01-05 16:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement on the binary character of 3073 Kursk has just appeared on CBET 792. I am copying it below for your convenience, and I am going to put notes on it to our web pages.

In a day or two, I will write here on what follow up observations would be useful for this one.

Cheers, Petr

(3073) KURSK
P. Kusnirak and P. Pravec, Ondrejov Observatory; S. Gajdos and A.
Galad, Modra Observatory; W. Cooney, J. Gross, and D. Terrell, Sonoita
Research Observatory, Sonoita, AZ; D. Pray, Carbuncle Hill Observatory,
Greene, RI; F. Colas and J. Lecacheux, Pic du Midi Observatory; V. Reddy,
Department of Earth System Science and Policy, University of North
Dakota, Grand Forks; and R. Dyvig, Quinn, SD, report that photometric
observations obtained during 2006 Dec. 11-27 reveal that minor planet
(3073) is a binary system with an orbital period of 44.96 ± 0.02 hr.
The primary shows a period of 3.4468 ± 0.0001 hr, and it has a
lightcurve amplitude of 0.21 mag. Mutual eclipse/occultation events that
are 0.06- to 0.07-mag deep indicate a secondary-to-primary mean-diameter
ratio of 0.25 ± 0.02.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2007 CBAT
2007 January 3 (CBET 792) Daniel W. E. Green [2007-01-03 18:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hello All,

Happy new year!

Nice work on 3073 Kursk. Its binary character has been well established, good solution for Porb and Ds/Dp:
Porb= 44.96 +/-0.02 h
Ds/Dp= 0.25 +/-0.02
Depth of the events: 0.06-0.07 mag
Duration of the events indicates that both occultations and eclipses occured there in the events. It is not obvious from the available data which one of the events is primary and which one is secondary.
The primary period of 3.4468 +/-0.0001 h is rated as U=3-. A half period of 1.7234 h doesn't look likely as the lightcurve doesn't appear entirely symmetric with it, but future data should nail the solution down.
http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png

I'm going to write a draft circular for CBET and will circulate it among collaborators shortly.

Cheers, Petr [2007-01-02 12:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· One new, and probably last one before the Full Moon, session by Don Pray from Carbuncle Hill Obs. was joined in. It covers almost whole event at 0.25 but was too much degraded by conditions and is not usable.

http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png

I'm back at Ondrejov so here pictures missing in my previous post (3 events observed from SRO and Badlands):

http://www.asu.cas.cz/~asteroid/03073_061225_badl.png
http://www.asu.cas.cz/~asteroid/03073_061226_sro.png
http://www.asu.cas.cz/~asteroid/03073_061227_sro.png

Peter K. [2006-12-30 10:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Well, I got suckered into that one (Dec 29). Moon and passing clouds made data useless.
Don [2006-12-29 16:56, CarbuncleHill]

· I'm attempting another run on this. Last night's data was fairly useless due to wind and clouds that appeared at the worst possible time. Tonight is better, but with a 66% moon, 33 deg. away. The images don't too affected.
Don [2006-12-29 01:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started a run on this at 23:30, Dec 27 ut, and should catch the entire 0.258 event.
Don [2006-12-27 23:27, CarbuncleHill]

· New data from 3 nights were joined in:

2006 Dec. 25.2 from Badlands Obs.,
2006 Dec. 26.2 and 27.2 from SRO.

They all fit very well and are showing part of attenuations. An event around phase of 0.758 has now sufficient coverage. But event around 0.258 needs one more session covering it as much as possible. Then 3073's discovery phase will be finished and we can prepare the CBET anouncement.

Nice work!

Peter K.

PS: No new pictures today. I'm outside Ondrejov and have not all my SW at hand. [2006-12-27 22:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· We started a run on this at ~2:30 UT. There are some thin clouds now with more coming later. We'll run it as long as we can.

John G [2006-12-27 06:26, Sonoita]

· New data from 3 nights were joined in:

2006 Dec. 24.9 from Modra (short run only),
2006 Dec. 25.1 from Carbuncle Hill,
2006 Dec. 25.2 from SRO (excellent quality).

They all fit very well with both periods and data from SRO are showing part of attenuation again.

http://www.asu.cas.cz/~asteroid/03073_061225_sro.png

These data refine P_orb to 44.96 hours:

http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png

The coverage outside of events is sufficient now (only small gap around 0.4) but we need improve coverage of both attenuations. Here are predicted mid-times of events for next 3 nights (when the Moon should not be a problem), if P_orb is 44.96 hours:

Dec.26 6.25 UT 0.258
Dec.27 4.71 UT 0.758
Dec.28 3.21 UT 0.258
Dec.29 1.67 UT 0.758

Duration of observed attenuations is 3.7 and 4.2 hours and we need also nearby parts outside them. As you see times of events prefer observers in US. It's good as here in Europe we have bad weather now.

Gap around phase of 0.412 (not necessary but useful to cover with one session):

Dec.26 13.15 UT
Dec.28 10.11 UT

Peter K. [2006-12-26 08:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will be running Kursk from SRO again tonight. Have been following (10658) in our field as well for the last several nights. It is apparently a fairly slow rotator so with the help of others at different longitudes who are working Kursk, we should be able to put a light curve together for (10658) as well. If you have data for it, please send it on to me at waltc@cox.net and I will phase it together and we'll publish in MPB. (10658) does not fit within the survey parameters. [2006-12-26 01:30, Sonoita] Message sent to BinAstPhotSurvey conference

· We started a run on this at 2:22 UT. We should get 6-7 hours as the weather is excellent.

John G [2006-12-25 03:21, Sonoita]

· Started run at 01:00, Dec 25 UT. Should get 7 hours if weather holds.
Vishnu and Ron [2006-12-25 01:34, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Starting run at 23:00, Dec 24 UT.
Don [2006-12-24 23:08, CarbuncleHill]

· New data from 3 nights were joined in:

2006 Dec. 23.8 from Modra (run shortened by fog),
2006 Dec. 24.1 from Carbuncle Hill,
2006 Dec. 24.3 from SRO.

They all fit very well with both periods. Data from SRO are showing part of attenuation and refine P_orb to 45.0 hours:

http://www.asu.cas.cz/~asteroid/03073_061224_sro.png

http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png

Merry Christmas!

Peter K. [2006-12-24 21:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have started a run on this at 3:10 UT. Weather is good.

John G [2006-12-24 04:37, Sonoita]

· New data from 4 nights were joined in:

2006 Dec. 18.0 and 19.9 by Francois Colas from Pic du Midi,
2006 Dec. 22.1 by Don Pray from Carbuncle Hill and
2006 Dec. 22.2 by Walt Cooney, John and Dirk from SRO.

They all fit very well with both periods and data from Pic are confirming our P_orb estimate of 45.2 hours as they caught end of an event on their both nights (phases 0.7-0.8):

http://www.asu.cas.cz/~asteroid/03073_061217_pic.png
http://www.asu.cas.cz/~asteroid/03073_061219_pic.png

Data from Carbuncle and SRO are outside the events and covering phases 0.9-1.1.

http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png

Nice work, guys!

Peter K. [2006-12-22 16:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006 Dec. 21.1 by Don from Carbuncle Hill.
They fit well, covering orbital phases outside events
(around phase 0.5), consistent with the preliminary Porb estimate of 45.2 h. See
http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png

Sure, covering orbital phases between the events is still quite necessary at the current stage of the work. There is still a lot of gaps in the coverage, they need to be filled to establish the solution well. And, after all, Porb has not been nailed down yet ....

Cheers, Petr [2006-12-21 17:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006 Dec. 20.1 by Don from Carbuncle Hill
2006 Dec. 20.3 by Walt, John and Dirk from SRO
They fit nicely, covering orbital phases outside events (phases between 0.9, 1.0/0.0 and 0.1 in the second plot below), consistent with the preliminary Porb estimate of 45.2 h. See
http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png

Cheers, Petr [2006-12-21 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 23:30, Dec ut, under excellent conditions.
Don [2006-12-21 01:12, CarbuncleHill]

· Started at 23:30, Dec 19 UT, under very good conditions.
Don [2006-12-20 00:49, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Between wind and clouds, last night was an excercise in futility. No data captured for any target. I'll try again tonight.
Don [2006-12-19 18:25, CarbuncleHill]

· Session of Dec. 18.2 by Walt, John and Dirk from SRO joined in. It fits nicely, covering orbital phases outside events, that is consistent with the preliminary Porb estimate of 45.2 h. See
http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png

Cheers, Petr [2006-12-19 18:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 02:15 ut in breezy and hazy conditions. It's forecast to improve, so there's hope.
Don [2006-12-19 02:23, CarbuncleHill]

· The night 2006 Dec 17.1 by Don from Carbuncle Hill joined in. Porb about 45.2 h appears likely, but coverage is pretty poor so far, we need more data (for all orbital phases) to establish it well.
http://www.asu.cas.cz/~asteroid/03073.png
http://www.asu.cas.cz/~asteroid/03073_longpc.png
Everyone who can take long sessions with errors not greater than 0.03 mag is welcome.

Cheers, Petr [2006-12-18 14:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Current dataset: Four nights with durations 1.6-4.2 h by Adrian and Stefan from Modra and one night 7.2h long by Peter from here.

Main period: 3.4469 +/-0.0003 h, but quadrumodal lightcurve:
http://www.asu.cas.cz/~asteroid/03073.png
a half period 1.7235 h fits equally well:
http://www.asu.cas.cz/~asteroid/03073_x.png
but it would suggest an unusually high bulk density (4 g/cm^3 or higher). Further observations will have to resolve which one of the two solutions for the main period is real.

No matter which one of the two solutions for the short period is real, the data by Peter of 2006-12-15.9 show an attenuation by 0.06-0.07 mag, presumably an event. In the short session 2006-12-15.0 by Adrian, there is apparent another possible event (to be checked/confirmed). A possible orbital period is about 45 hours,
http://www.asu.cas.cz/~asteroid/03073_longpc.png
but more data are needed to really establish it. Long sessions with errors <=0.03 mag are needed.

Cheers, Petr [2006-12-17 14:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be doing this tonight.
Don [2006-12-16 22:39, CarbuncleHill]

· It seems I caught an event on last night. It was 0.07-0.08 mag deep and its duration was between 2.3 and 3.8 hours (unfortunately there were two background stars on time of event). See this link:

http://www.asu.cas.cz/~asteroid/03073_061215_ond.png

More observations are needed. Please do it, if you can obtain long runs with errors <0.02 mag.

Peter K. [2006-12-16 16:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18 UT in excellent conditions. Peter K. [2006-12-15 19:09, Ondrejov]

· A session of about 4 h with interruptions mostly due to clouds. adrian [2006-12-13 22:51, Modra] Message sent to BinAstPhotSurvey conference

· Changing condition - so we just try this to add another session. Adrian and Stefan [2006-12-13 00:12, Modra]

· Started with this already older (and fainter) target at 18:40 UT on Dec.11. Hope in full run to 1:20 UT, Dec.12.

Stefan [2006-12-11 19:25, Modra] Message sent to BinAstPhotSurvey conference

(2402) Satpaev (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique period, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02402.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2017-01-10 09:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I ran two sessions on this new target on Dec 31 and Jan 2.
Don [2017-01-02 19:52, Sugarloaf]

(4296) vanWoerkom (Finished) - binary [Add new note]
· Done. [2017-01-09 10:01, Ondrejov]

· Plan to observe this one at Dark Sky from about 2330-0530 UT to cover the predicted 0306 UT secondary, if the period is 26.25 hours. Joe [2016-12-20 23:07, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

· Caroline, I'm sending this through our BinAstPhotSurvey binast-webtool so that observers within our consortium are informed.

Caroline Odden observed this one (outside our Survey) on four nights, revealed it to be a binary asteroid. My decomposition of her data:
http://www.asu.cas.cz/~asteroid/04296_porb.png
http://www.asu.cas.cz/~asteroid/04296_p1.png
The P_orb solution is ambiguous, it is 26.25 h or twice that. It needs to be resolved before we publish this one on CBET. Following event ephemeris is for the 26.25-h solution; if it is 52.5 h, only the 0.25-phase events will occur. Data with errors not greater than 0.03 mag are needed and long sessions are preferred. (And don't confine your observations too narrowly around the predicted mid-event times, the orbital period is not very accurate yet.)

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 7.23 0.249
2016-12-18 9.48 0.249
2016-12-19 11.73 0.249
2016-12-20 13.98 0.249
2016-12-21 16.23 0.249
2016-12-22 18.48 0.249
2016-12-23 20.73 0.249
2016-12-24 22.98 0.249
2016-12-26 1.23 0.249
2016-12-27 3.48 0.249
2016-12-28 5.73 0.249
2016-12-29 7.98 0.249
2016-12-30 10.23 0.249
2016-12-31 12.48 0.249
2017- 1- 1 14.73 0.249
2017- 1- 2 16.98 0.249
2017- 1- 3 19.23 0.249
2017- 1- 4 21.48 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2016-12-17 20.35 0.749
2016-12-18 22.60 0.749
2016-12-20 0.85 0.749
2016-12-21 3.10 0.749
2016-12-22 5.35 0.749
2016-12-23 7.60 0.749
2016-12-24 9.85 0.749
2016-12-25 12.10 0.749
2016-12-26 14.35 0.749
2016-12-27 16.60 0.749
2016-12-28 18.85 0.749
2016-12-29 21.10 0.749
2016-12-30 23.35 0.749
2017- 1- 1 1.60 0.749
2017- 1- 2 3.85 0.749
2017- 1- 3 6.10 0.749
2017- 1- 4 8.35 0.749

Clear Skies, Petr [2016-12-09 07:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(1530) Rantaseppa (Finished) [Add new note]
· Amadeo Aznar observed this new target: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01530.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2017-01-09 09:34, Ondrejov] Message sent to BinAstPhotSurvey conference

(1806) Derice (Finished) [Add new note]
· Amadeo Aznar did this return "prime suspect" sufficiently for this apparition, no significant deviation seen.
http://www.asu.cas.cz/~asteroid/01806_b6.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-12-23 09:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Michal Pikler and Marek Husarik did this return "prime suspect" from Skalnate Pleso on three nights in its current 4th apparition. Good result, sufficient coverage, no substantial deviation:
http://www.asu.cas.cz/~asteroid/01806_b2.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-08-28 14:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Try to complete full rot.phase from 21UT.
Marek [2012-08-19 19:10, SkalnatePleso] [Remove]

· This one tonight from 21UT.
Marek [2012-08-18 20:12, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 20:30 UT in relatively good conditions. Michal [2012-08-17 21:13, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 20:10 UT in relatively good conditions at the moment - without further prediction. Michal [2012-08-16 20:27, SkalnatePleso] [Remove]

· This "prime suspect" was done extensively by Joe with Prompt and by David from Hunters Hill in this 3rd apparition. Like in the previous two apparitions, it is unique solution, thorough coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/01806_b1.png
Closed now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-05-30 08:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2011 05 04 from 09:28UT to 19:14UT in good conditions though quite a few star subtractions were required. Data is still 'noisy' indicating a possible underlying secondary period. [2011-05-05 01:38, HuntersHill] Message sent to observers

· Began observing from Prompt under good conditions at 0000 UT. Hope to get ~10 hours. Joe [2011-05-04 00:26, Dark Sky & PROMPT]

· Began observing from Prompt under good conditions at 0000 UT. Hope to get ~10 hours. Joe [2011-05-03 02:47, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt under good conditions at 0000 UT. Hope to get ~10 hours. Joe [2011-05-02 00:24, Dark Sky & PROMPT]

· Began observing from Prompt under good conditions at 0400 UT. Hope to get ~6 hours. Joe [2011-04-25 04:33, Dark Sky & PROMPT] Message sent to observers

· Observed 20110423 from 10:32UT to 19:23UT in good conditions. This was first light with the new STL1001e purchased care of the 2010 Planetary Society Gene Shoemaker NEO Grant. The data is relatively sparse as I was covering as many different targets as possible to gauge performance against the ST-8e setup. I also encountered a few issues with pointing (plate solving) and guiding. HHO is now operating at f/9.4 with a resolution of 1.48"/px and a 25.4 x 25.4 arcmin fov. It also appears focus is less critical at f/9.4 compared to the old f/4 setup. [2011-04-24 10:01, HuntersHill] Message sent to observers

· Began observing from Prompt under good conditions at 0125 UT. Hope to get ~9 hours. Joe [2011-04-24 03:35, Dark Sky & PROMPT]

· Began observing from Prompt under good conditions at 0045 UT. Hope to get ~8 hours. Joe [2011-04-23 00:52, Dark Sky & PROMPT] Message sent to observers

· Peter K has identified an issue with my original data so I remeasured it. The new results indicate a deviation that may be an event but due to my observing conditions confirmation will be needed. (http://www.asu.cas.cz/~asteroid/01806_20110417.png)

I have overcast conditions forecast for the next few days and will also be in the process of upgrading my observatory with new PC hardware, software and my newly arrive STL1001 Camera so it would be appreciated if anyone can assist with this target to observe it.

Cheers

David [2011-04-20 22:14, HuntersHill] Message sent to observers

· Observed 2011-04-17 from 10:53UT to 18:19UT in less than ideal conditions (moon affected and bright star subtraction) Fitting the curve to the previously established 3.224hrs shows a rather noisy plot indicating possible deviations. [2011-04-17 22:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· This "prime suspect" has been done well in the 2nd apparition by Don from Carbuncle Hill, by Peter K. from Ondrejov, and by Leos and Peter V. from Modra. Unique solution, refining and complementing that from 2006 (where the asteroid was apparently seen closer to equator-on, considering its higher amplitude then), dense coverage, a few minor deviations seen, but they all were below the Survey's detection limit.
http://www.asu.cas.cz/~asteroid/01806_a9.png
http://www.asu.cas.cz/~asteroid/1806.png
Closed for this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2009-11-20 19:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 17:20 UT. Peter K. [2009-11-19 19:03, Ondrejov] Message sent to observers

· Doing a run tonight starting at 01:50 UT.
Don. [2009-11-18 02:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 00:50 UT.
Don [2009-11-08 03:24, CarbuncleHill]

· Observing from 19:10 UT tonight. Peter K. [2009-10-30 19:12, Ondrejov] Message sent to observers

· Observed 10/26-27/2009 0340-0840 UT from Prompt under excellent conditions. Joe [2009-10-27 14:00, Dark Sky & PROMPT]

· Observed 2009-10-18 from 22:55UT to 03:05UT in good conditions. Leos, Peter Veres [2009-10-20 06:30, Modra] Message sent to observers

· Started ar 02:10 UT.
Don [2009-10-20 02:10, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 02:45 UT
Don [2009-10-15 03:38, CarbuncleHill]

· Did a run on this Oct 12, and plan on another tonight starting at 02:40 UT.
Don [2009-10-14 01:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Three long sessions for this one, two by Don from Carbuncle Hill and one by Gabo and Marek from Skalnate Pleso: unique solution, multiple coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/1806.png
It is finished for the BinAstPhotSurvey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2006-12-21 13:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm planning a run on this later tonight.
Don [2006-12-21 01:13, CarbuncleHill]

· I'll be doing this one later tonight.
Don [2006-12-20 00:50, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This object observed from 20:57 UT to 03:01 UT, December 18/19. Gabo [2006-12-19 06:24, SkalnatePleso] [Remove]

· I'll be starting this one a little past 04:00 ut.
Don [2006-12-19 03:43, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this at 04:00ut.
Don [2006-12-17 04:20, CarbuncleHill]

· Assumming the weather holds, I'll be starting this tonight.
Don [2006-12-12 01:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3067) Akhmatova (Finished) [Add new note]
· Vladimir Benishek observed this return "prime suspect" from Sopot. Unlike in the previous two apparitions when it showed amplitudes 0.24 and 0.30 mag, it has a high amplitude of nearly 0.8 mag now. Apparently we saw it at high asterocentric latitude aspects in the first two apparitions.
http://www.asu.cas.cz/~asteroid/03067_b6.png
So, it is not a "prime suspect" any longer.
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-12-20 14:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· This return "prime suspect" was done extensively by Julian Oey from Leura, supported with 2 nights by Joe Pollock with Prompt and with 1 night by Nicolas Morales from San Pedro de Atacama. There were seen a few suspect short or end-of-night features, but inconclusive:
http://www.asu.cas.cz/~asteroid/03067_11a.png
http://www.asu.cas.cz/~asteroid/03067_11b.png
Cf. with data from 2009 by Russ Durkee and Don Pray:
http://www.asu.cas.cz/~asteroid/03067.png

Target closed for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the somewhat uncertain case.

Petr [2011-06-27 10:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 8UT to 15.7UT 06/25. Condition was good. [2011-06-26 06:02, Blue Mountains Obs] Message sent to observers

· observed on 06/20 and 06/24(8UT to 15.5UT) with the later under excellent condition. [2011-06-25 07:05, Blue Mountains Obs]

· observed on 06/06,06/07,06/08,06/09, and 06/10 . Only manage short sessions with the exception of 06/09. [2011-06-11 02:36, Blue Mountains Obs] Message sent to observers

· Observed on 06/03 and 06/05. Numerous data point lost due to background stars. So far no attenuation detected. [2011-06-06 03:16, Blue Mountains Obs]

· Julian has got a suspect attenuation on May 25, see the x-ed points in following plot:
http://www.asu.cas.cz/~asteroid/03067_b1.png
More observations are needed to confirm and establish a period of the event.

Clear Skies, Petr [2011-06-02 09:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 10.29UT to 18.48 UT 05/27 under good condtion. again the light curve is segmented due to deleted data points with star contamination. [2011-05-28 09:55, Blue Mountains Obs] Message sent to observers

· observed on 05/10,05/11,05/12,and 05/26 under good observing condition. however so many back ground stars needed to be subtracted that the remaining light curves were segmented. Good result is seen on 05/26 where the last half hour show an attenuation. data sent in. [2011-05-27 12:03, Blue Mountains Obs] Message sent to observers

· Began observing from Prompt under good conditions at 2300 UT. Joe [2011-05-25 23:20, Dark Sky & PROMPT]

· Julian has taken four nights for this return "prime suspect". Most of this data fit well with single period, but there is one suspect decrease. It is relatively short, 0.8 h, but not implausible - it could be a partial event. See
http://www.asu.cas.cz/~asteroid/03067_b1.png
cf. with the 1st apparition's data:
http://www.asu.cas.cz/~asteroid/03067.png

I encourage Julian and others who can do the object at Dec ~ -26 deg to observe it extensively to confirm the suspect feature.

Clear Skies, Petr [2011-05-11 12:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began observing with Prompt at 2330 UT under good conditions. Joe [2011-05-10 03:41, Dark Sky & PROMPT] Message sent to observers

· observed from 10Ut TO 17 UT 05/08. weather improved second half of the night. [2011-05-09 11:03, Blue Mountains Obs]

· Began observing with Prompt at 0045 UT under good conditions. Joe [2011-05-09 02:42, Dark Sky & PROMPT] Message sent to observers

· Started with this returning prime suspect. Observed in good condition on 5/4 and 5/5. [2011-05-08 06:16, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This one has been done well by Russ Durkee: Unique solution, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/03067.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-11-18 17:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will be following this one again tonight starting at 8UT. Period looks to be 3.68h with a 0.3M amplitude. Might be finished after tonight pending guidance from Petr.

Russ [2009-11-16 21:11, Shed of Science] Message sent to observers

· Will be starting this one again tonight at 8UT and follow it for a few hours.

Russ [2009-11-16 03:08, Shed of Science]

· Will be starting this one at about 8UT after 2486 Metsahovi sets. Should be able to get a 3 hours on it.

Russ [2009-11-15 00:55, Shed of Science] Message sent to BinAstPhotSurvey conference

(11873) Kokuseibi (Finished) [Add new note]
· Julian Oey did this new target: Unique solution, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/11873.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-12-09 11:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 11/28 and 12/01 [2016-12-02 01:23, Blue Mountains Obs] Message sent to observers

· additional done observations on 11/21 and 11/24 [2016-11-25 04:24, Blue Mountains Obs]

· observed on 11/15 and 11/17 close to full moon time resulting in some lightcurve scattering . [2016-11-18 08:26, Blue Mountains Obs] Message sent to observers

· start a new target from 12:11 UT [2016-11-06 08:41, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(1741) Giclas (Finished) - return paired asteroid - one night per lunation needed [Add new note]
· Closed for this apparition. [2016-12-09 09:35, Ondrejov]

· observed 09/27. data sent in. light curve appears to diverge. [2016-10-01 06:21, Blue Mountains Obs] Message sent to observers

· observed on 08/25 from 11:13UT to 17:23UT that covers 2 rotations. [2016-08-26 11:12, Blue Mountains Obs]

· Julian has checked his images from the night 06-29 and he found that the apparent brightenning was an artifact due to a faint background galaxy. So, this was a "false alarm"; there appears nothing peculiar in this one and a thorough work is not needed.

Petr [2016-07-18 06:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Julian Oey observed this return paired asteroid from Leura on four nights from 2016-06-28 to 07-04 when it was moving slowly (nearly stationary). He reduced the 4 sessions wrt the same set of comparison stars. Three of them fit together reasonably well:
http://www.asu.cas.cz/~asteroid/001741_2016_p1.png
but one shows what appears to be a gradual brightenning over about 2/3 of the run; see residuals from the best fit to the three fitting nights:
http://www.asu.cas.cz/~asteroid/001741_2016_p2.png

This is a peculiar behaviour. Might be a secondary rotational lightcurve, but we would need to confirm it and derive its period to eliminate a possibility of an observational artifact. Julian will certainly attempt to take more data, but it would be good if others could help him from different longitudes. Errors not greater than 0.02 mag will be needed and long sessions will be good; don't bother if you cannot take at least a 3-hour long run. An accurate linkage of your individual runs in a consistent magnitude system would help a lot as well. The asteroid is approaching the bright Moon now, so maybe starting after the Full Moon (after July 25 or so) will be good.

Clear Skies, Petr [2016-07-17 14:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this paired asteroid for 4 nights 06/28, 06/29, 07/02, 07/03. Good condition [2016-07-17 10:57, Blue Mountains Obs]

· Done for this apparition. [2014-05-12 10:45, Ondrejov]

· Doing this one along with 3309.
Don [2014-04-25 01:29, Sugarloaf] Message sent to observers

· Clear sky for this asteroid, starting at 18:30 UT. Gabo [2014-04-12 18:00, SkalnatePleso] [Remove]

· Don Pray has taken a session covering the rotation period twice on March 19:
http://www.asu.cas.cz/~asteroid/001741_2014b.png
http://www.asu.cas.cz/~asteroid/001741_2014a.png

It is sufficient data for this lunation. Taking one last session for this apparition in the 2nd half of April will be useful for its modelling.

Cheers, Petr [2014-03-20 09:45, Ondrejov]

· Don Pray took a full rotation on February 23. Our current data:
http://www.asu.cas.cz/~asteroid/001741_2014a.png
http://www.asu.cas.cz/~asteroid/001741_2014b.png

This is sufficient data for this lunation. Taking one more session in the next lunation in the 2nd half of March will be useful.

Cheers, Petr [2014-02-23 15:45, Ondrejov]

· I'll be observing this one starting at 03:00 UT, weather permitting.
Don [2014-02-23 01:08, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'm planning a run on this starting at 03:00 UT.
Don [2014-02-11 02:13, Sugarloaf] Message sent to observers

· I Plan to start this one at 03:20 UT.
Don [2014-02-08 02:56, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2754) Efimow (Finished) - return binary [Add new note]
· Done for this apparition. [2016-12-08 09:03, Ondrejov]

· Started observing at 20:45 UT. Gabo [2016-11-09 20:47, SkalnatePleso] [Remove]
Message sent to observers

· Fred Vachier observed this one extensively from Reunion, supported with one night by Nelya Gaftonyuk from Simeiz:
http://www.asu.cas.cz/~asteroid/02754_2016d_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016d_p1.png
http://www.asu.cas.cz/~asteroid/02754_2016c_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016c_p1.png
http://www.asu.cas.cz/~asteroid/02754_2016b_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016b_p1.png
http://www.asu.cas.cz/~asteroid/02754_2016a_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016a_p1.png

Last data for this apparition would be useful for refined event modeling. Errors < 0.02 mag are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 10.80 0.300
2016-11-19 1.57 0.300
2016-11-19 16.33 0.300
2016-11-20 7.10 0.300
2016-11-20 21.86 0.300
2016-11-21 12.63 0.300
2016-11-22 3.39 0.300
2016-11-22 18.16 0.300
2016-11-23 8.92 0.300
2016-11-23 23.69 0.300
2016-11-24 14.45 0.300
2016-11-25 5.22 0.300
2016-11-25 19.98 0.300
2016-11-26 10.75 0.300
2016-11-27 1.51 0.300
2016-11-27 16.28 0.300
2016-11-28 7.04 0.300
2016-11-28 21.81 0.300
2016-11-29 12.57 0.300
2016-11-30 3.34 0.300
2016-11-30 18.10 0.300
2016-12- 1 8.87 0.300
2016-12- 1 23.63 0.300
2016-12- 2 14.40 0.300
2016-12- 3 5.16 0.300
2016-12- 3 19.93 0.300
2016-12- 4 10.69 0.300
2016-12- 5 1.46 0.300
2016-12- 5 16.22 0.300
2016-12- 6 6.99 0.300

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 3.18 0.784
2016-11-18 17.95 0.784
2016-11-19 8.71 0.784
2016-11-19 23.48 0.784
2016-11-20 14.24 0.784
2016-11-21 5.01 0.784
2016-11-21 19.77 0.784
2016-11-22 10.54 0.784
2016-11-23 1.30 0.784
2016-11-23 16.07 0.784
2016-11-24 6.83 0.784
2016-11-24 21.60 0.784
2016-11-25 12.36 0.784
2016-11-26 3.13 0.784
2016-11-26 17.89 0.784
2016-11-27 8.66 0.784
2016-11-27 23.42 0.784
2016-11-28 14.19 0.784
2016-11-29 4.95 0.784
2016-11-29 19.72 0.784
2016-11-30 10.48 0.784
2016-12- 1 1.25 0.784
2016-12- 1 16.01 0.784
2016-12- 2 6.78 0.784
2016-12- 2 21.54 0.784
2016-12- 3 12.31 0.784
2016-12- 4 3.07 0.784
2016-12- 4 17.84 0.784
2016-12- 5 8.60 0.784
2016-12- 5 23.37 0.784

Clear Skies, Petr [2016-11-09 14:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed last night at 16h to 20h20 UT, Fred [2016-11-07 07:18, Les Makes]

· Data obtained for this one in this apparition so far:
http://www.asu.cas.cz/~asteroid/02754_2016c_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016c_p1.png
http://www.asu.cas.cz/~asteroid/02754_2016b_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016b_p1.png
http://www.asu.cas.cz/~asteroid/02754_2016a_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016a_p1.png

Event monitoring in the rest of this apparition would be useful for refined modeling (errors 0.01 mag needed). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-19 6.97 0.277
2016-10-19 21.74 0.277
2016-10-20 12.50 0.277
2016-10-21 3.27 0.277
2016-10-21 18.03 0.277
2016-10-22 8.80 0.277
2016-10-22 23.56 0.277
2016-10-23 14.33 0.277
2016-10-24 5.09 0.277
2016-10-24 19.86 0.277
2016-10-25 10.62 0.277
2016-10-26 1.39 0.277
2016-10-26 16.15 0.277
2016-10-27 6.92 0.277
2016-10-27 21.68 0.277
2016-10-28 12.45 0.277
2016-10-29 3.21 0.277
2016-10-29 17.98 0.277
2016-10-30 8.74 0.277
2016-10-30 23.51 0.277
2016-10-31 14.27 0.277
2016-11- 1 5.04 0.277
2016-11- 1 19.80 0.277
2016-11- 2 10.57 0.277
2016-11- 3 1.33 0.277
2016-11- 3 16.10 0.277
2016-11- 4 6.86 0.277
2016-11- 4 21.63 0.277
2016-11- 5 12.39 0.277
2016-11- 6 3.16 0.277
2016-11- 6 17.92 0.277
2016-11- 7 8.69 0.277
2016-11- 7 23.45 0.277
2016-11- 8 14.22 0.277

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-19 14.26 0.770
2016-10-20 5.02 0.770
2016-10-20 19.79 0.770
2016-10-21 10.55 0.770
2016-10-22 1.32 0.770
2016-10-22 16.08 0.770
2016-10-23 6.85 0.770
2016-10-23 21.61 0.770
2016-10-24 12.38 0.770
2016-10-25 3.14 0.770
2016-10-25 17.91 0.770
2016-10-26 8.67 0.770
2016-10-26 23.44 0.770
2016-10-27 14.20 0.770
2016-10-28 4.97 0.770
2016-10-28 19.73 0.770
2016-10-29 10.50 0.770
2016-10-30 1.26 0.770
2016-10-30 16.03 0.770
2016-10-31 6.79 0.770
2016-10-31 21.56 0.770
2016-11- 1 12.32 0.770
2016-11- 2 3.09 0.770
2016-11- 2 17.85 0.770
2016-11- 3 8.62 0.770
2016-11- 3 23.38 0.770
2016-11- 4 14.15 0.770
2016-11- 5 4.91 0.770
2016-11- 5 19.68 0.770
2016-11- 6 10.44 0.770
2016-11- 7 1.21 0.770
2016-11- 7 15.97 0.770
2016-11- 8 6.74 0.770
2016-11- 8 21.50 0.770

Clear Skies, Petr [2016-10-12 08:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this night at 21:40 UT. Gabo [2016-09-11 21:50, SkalnatePleso] [Remove]
Message sent to observers

· Started this target at 20:45 UT. Gabo [2016-09-09 20:54, SkalnatePleso] [Remove]

· Started observing at 23:20 UT. Gabo [2016-09-07 23:28, SkalnatePleso] [Remove]
Message sent to observers

· This one has been worked sufficiently in this lunation:
http://www.asu.cas.cz/~asteroid/02754_2016b_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016b_p1.png
More observations will be useful in the next lunation; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-20 8.64 0.251
2016- 9-20 23.41 0.251
2016- 9-21 14.17 0.251
2016- 9-22 4.94 0.251
2016- 9-22 19.70 0.251
2016- 9-23 10.47 0.251
2016- 9-24 1.23 0.251
2016- 9-24 16.00 0.251
2016- 9-25 6.76 0.251
2016- 9-25 21.53 0.251
2016- 9-26 12.29 0.251
2016- 9-27 3.06 0.251
2016- 9-27 17.82 0.251
2016- 9-28 8.59 0.251
2016- 9-28 23.35 0.251
2016- 9-29 14.12 0.251
2016- 9-30 4.88 0.251
2016- 9-30 19.65 0.251
2016-10- 1 10.41 0.251
2016-10- 2 1.18 0.251
2016-10- 2 15.94 0.251
2016-10- 3 6.71 0.251
2016-10- 3 21.47 0.251
2016-10- 4 12.24 0.251
2016-10- 5 3.00 0.251
2016-10- 5 17.77 0.251
2016-10- 6 8.53 0.251
2016-10- 6 23.30 0.251
2016-10- 7 14.06 0.251
2016-10- 8 4.83 0.251
2016-10- 8 19.59 0.251
2016-10- 9 10.36 0.251
2016-10-10 1.12 0.251
2016-10-10 15.89 0.251
2016-10-11 6.65 0.251
2016-10-11 21.42 0.251
2016-10-12 12.18 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-20 1.40 0.760
2016- 9-20 16.16 0.760
2016- 9-21 6.93 0.760
2016- 9-21 21.69 0.760
2016- 9-22 12.46 0.760
2016- 9-23 3.22 0.760
2016- 9-23 17.99 0.760
2016- 9-24 8.75 0.760
2016- 9-24 23.52 0.760
2016- 9-25 14.28 0.760
2016- 9-26 5.05 0.760
2016- 9-26 19.81 0.760
2016- 9-27 10.58 0.760
2016- 9-28 1.34 0.760
2016- 9-28 16.11 0.760
2016- 9-29 6.87 0.760
2016- 9-29 21.64 0.760
2016- 9-30 12.40 0.760
2016-10- 1 3.17 0.760
2016-10- 1 17.93 0.760
2016-10- 2 8.70 0.760
2016-10- 2 23.46 0.760
2016-10- 3 14.23 0.760
2016-10- 4 4.99 0.760
2016-10- 4 19.76 0.760
2016-10- 5 10.52 0.760
2016-10- 6 1.29 0.760
2016-10- 6 16.05 0.760
2016-10- 7 6.82 0.760
2016-10- 7 21.58 0.760
2016-10- 8 12.35 0.760
2016-10- 9 3.11 0.760
2016-10- 9 17.88 0.760
2016-10-10 8.64 0.760
2016-10-10 23.41 0.760
2016-10-11 14.17 0.760
2016-10-12 4.94 0.760

Clear Skies, Petr [2016-09-04 06:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· This return binary (4th apparition) has been observed by Amadeo Aznar in the previous lunation and by Jan Vrastil, Hana Kucakova, Peter Kusnirak and Kamil Hornoch from here in this lunation:
http://www.asu.cas.cz/~asteroid/02754_2016a_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016a_p1.png
http://www.asu.cas.cz/~asteroid/02754_2016b_porb.png
http://www.asu.cas.cz/~asteroid/02754_2016b_p1.png

A second coverage of each of the two events would be useful; errors < 0.01 mag are needed (don't bother in less ideal conditions). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 8-31 1.50 0.255
2016- 8-31 16.27 0.255
2016- 9- 1 7.05 0.255
2016- 9- 1 21.83 0.255
2016- 9- 2 12.60 0.255
2016- 9- 3 3.38 0.255
2016- 9- 3 18.15 0.255
2016- 9- 4 8.93 0.255
2016- 9- 4 23.71 0.255
2016- 9- 5 14.48 0.255
2016- 9- 6 5.26 0.255
2016- 9- 6 20.03 0.255
2016- 9- 7 10.81 0.255
2016- 9- 8 1.59 0.255
2016- 9- 8 16.36 0.255
2016- 9- 9 7.14 0.255
2016- 9- 9 21.91 0.255
2016- 9-10 12.69 0.255
2016- 9-11 3.47 0.255
2016- 9-11 18.24 0.255
2016- 9-12 9.02 0.255
2016- 9-12 23.79 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2016- 8-30 18.17 0.759
2016- 8-31 8.95 0.759
2016- 8-31 23.73 0.759
2016- 9- 1 14.50 0.759
2016- 9- 2 5.28 0.759
2016- 9- 2 20.05 0.759
2016- 9- 3 10.83 0.759
2016- 9- 4 1.61 0.759
2016- 9- 4 16.38 0.759
2016- 9- 5 7.16 0.759
2016- 9- 5 21.93 0.759
2016- 9- 6 12.71 0.759
2016- 9- 7 3.49 0.759
2016- 9- 7 18.26 0.759
2016- 9- 8 9.04 0.759
2016- 9- 8 23.81 0.759
2016- 9- 9 14.59 0.759
2016- 9-10 5.37 0.759
2016- 9-10 20.14 0.759
2016- 9-11 10.92 0.759
2016- 9-12 1.69 0.759
2016- 9-12 16.47 0.759
2016- 9-13 7.25 0.759

Clear Skies, Petr [2016-08-30 13:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Asteroid (2754) Efimow started two nights ago. 2 sessions worked. [2016-08-08 22:17, IAO-Isaac Aznar Obs.]

(4742) Caliumi (Finished) [Add new note]
· Fred Vachier observed this new target with the telescope in Reunion on two nights, supported with a short run by Vladimir Benishek from Sopot: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04742.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work guys.

Cheers, Petr [2016-12-08 08:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this one tonight Dec 6, 17:00 UT [2016-12-06 17:07, Les Makes]

(6016) 1991 PA11 (Finished) - return binary [Add new note]
· Discovery apparition finished. [2016-12-07 15:48, Ondrejov]

· Current status of this one:
http://www.asu.cas.cz/~asteroid/06016_2016b_porb.png
http://www.asu.cas.cz/~asteroid/06016_2016b_p1.png
http://www.asu.cas.cz/~asteroid/06016_2016a_porb.png
http://www.asu.cas.cz/~asteroid/06016_2016a_p1.png

Last data for this apparition would be useful for future modeling. Errors < 0.02 mag needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 1.01 0.253
2016-11-18 22.34 0.253
2016-11-19 19.67 0.253
2016-11-20 17.00 0.253
2016-11-21 14.33 0.253
2016-11-22 11.66 0.253
2016-11-23 8.99 0.253
2016-11-24 6.32 0.253
2016-11-25 3.65 0.253
2016-11-26 0.98 0.253
2016-11-26 22.31 0.253
2016-11-27 19.64 0.253
2016-11-28 16.97 0.253
2016-11-29 14.30 0.253
2016-11-30 11.63 0.253
2016-12- 1 8.96 0.253
2016-12- 2 6.29 0.253
2016-12- 3 3.62 0.253
2016-12- 4 0.95 0.253
2016-12- 4 22.28 0.253
2016-12- 5 19.61 0.253
2016-12- 6 16.94 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2016-11-18 11.69 0.754
2016-11-19 9.02 0.754
2016-11-20 6.35 0.754
2016-11-21 3.68 0.754
2016-11-22 1.01 0.754
2016-11-22 22.34 0.754
2016-11-23 19.67 0.754
2016-11-24 17.00 0.754
2016-11-25 14.33 0.754
2016-11-26 11.66 0.754
2016-11-27 8.99 0.754
2016-11-28 6.32 0.754
2016-11-29 3.65 0.754
2016-11-30 0.98 0.754
2016-11-30 22.31 0.754
2016-12- 1 19.64 0.754
2016-12- 2 16.97 0.754
2016-12- 3 14.30 0.754
2016-12- 4 11.63 0.754
2016-12- 5 8.96 0.754
2016-12- 6 6.29 0.754

Clear Skies, Petr [2016-11-09 14:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:20 UT and hope to catch the event at 1:07 UT.
Don [2016-10-25 00:51, Sugarloaf] Message sent to observers

· Current status of this one:
http://www.asu.cas.cz/~asteroid/06016_2016b_porb.png
http://www.asu.cas.cz/~asteroid/06016_2016b_p1.png
http://www.asu.cas.cz/~asteroid/06016_2016a_porb.png
http://www.asu.cas.cz/~asteroid/06016_2016a_p1.png

The events are evolving and monitoring their evolution would be useful (errors < 0.02 mag needed). Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-19 17.14 0.254
2016-10-20 14.47 0.254
2016-10-21 11.80 0.254
2016-10-22 9.13 0.254
2016-10-23 6.46 0.254
2016-10-24 3.79 0.254
2016-10-25 1.12 0.254
2016-10-25 22.45 0.254
2016-10-26 19.78 0.254
2016-10-27 17.11 0.254
2016-10-28 14.44 0.254
2016-10-29 11.77 0.254
2016-10-30 9.10 0.254
2016-10-31 6.43 0.254
2016-11- 1 3.76 0.254
2016-11- 2 1.09 0.254
2016-11- 2 22.42 0.254
2016-11- 3 19.75 0.254
2016-11- 4 17.08 0.254
2016-11- 5 14.41 0.254
2016-11- 6 11.74 0.254
2016-11- 7 9.07 0.254
2016-11- 8 6.40 0.254
2016-11- 9 3.73 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2016-10-19 6.47 0.754
2016-10-20 3.80 0.754
2016-10-21 1.13 0.754
2016-10-21 22.46 0.754
2016-10-22 19.79 0.754
2016-10-23 17.12 0.754
2016-10-24 14.45 0.754
2016-10-25 11.78 0.754
2016-10-26 9.11 0.754
2016-10-27 6.44 0.754
2016-10-28 3.77 0.754
2016-10-29 1.10 0.754
2016-10-29 22.43 0.754
2016-10-30 19.76 0.754
2016-10-31 17.09 0.754
2016-11- 1 14.42 0.754
2016-11- 2 11.75 0.754
2016-11- 3 9.08 0.754
2016-11- 4 6.41 0.754
2016-11- 5 3.74 0.754
2016-11- 6 1.07 0.754
2016-11- 6 22.40 0.754
2016-11- 7 19.73 0.754
2016-11- 8 17.06 0.754

Clear Skies, Petr [2016-10-13 07:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed for now. [2016-10-12 09:00, Les Makes] Message sent to observers

· Plan to start this at 01:20 UT, and hope to catch the 0.762 phase event before the clouds arrive.
Don [2016-10-12 01:03, Sugarloaf]

· Started this at 01:20 UT and hope to catch most of the 0.762 phase event.

Don [2016-10-11 01:34, Sugarloaf] Message sent to observers

· I plan to do it tonight. [2016-10-10 11:23, Les Makes]

· Current status (two more sessions added, from OPERA and from here):
http://www.asu.cas.cz/~asteroid/06016_porb.png
http://www.asu.cas.cz/~asteroid/06016_p1.png

More data for both events (long sessions with errors 0.01 mag) in the next lunation will be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-21 6.73 0.261
2016- 9-22 4.06 0.261
2016- 9-23 1.39 0.261
2016- 9-23 22.72 0.261
2016- 9-24 20.05 0.261
2016- 9-25 17.38 0.261
2016- 9-26 14.71 0.261
2016- 9-27 12.04 0.261
2016- 9-28 9.37 0.261
2016- 9-29 6.70 0.261
2016- 9-30 4.03 0.261
2016-10- 1 1.36 0.261
2016-10- 1 22.69 0.261
2016-10- 2 20.02 0.261
2016-10- 3 17.35 0.261
2016-10- 4 14.68 0.261
2016-10- 5 12.01 0.261
2016-10- 6 9.34 0.261
2016-10- 7 6.67 0.261
2016-10- 8 4.00 0.261
2016-10- 9 1.33 0.261
2016-10- 9 22.66 0.261
2016-10-10 19.99 0.261
2016-10-11 17.32 0.261
2016-10-12 14.65 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9-20 20.09 0.762
2016- 9-21 17.42 0.762
2016- 9-22 14.75 0.762
2016- 9-23 12.08 0.762
2016- 9-24 9.41 0.762
2016- 9-25 6.74 0.762
2016- 9-26 4.07 0.762
2016- 9-27 1.40 0.762
2016- 9-27 22.73 0.762
2016- 9-28 20.06 0.762
2016- 9-29 17.39 0.762
2016- 9-30 14.72 0.762
2016-10- 1 12.05 0.762
2016-10- 2 9.38 0.762
2016-10- 3 6.71 0.762
2016-10- 4 4.04 0.762
2016-10- 5 1.37 0.762
2016-10- 5 22.70 0.762
2016-10- 6 20.03 0.762
2016-10- 7 17.36 0.762
2016-10- 8 14.69 0.762
2016-10- 9 12.02 0.762
2016-10-10 9.35 0.762
2016-10-11 6.68 0.762
2016-10-12 4.01 0.762

Clear Skies, Petr [2016-09-13 13:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our discovery announcement has appeared on CBET 4316, copied below for your convenience.

Cheers, Petr

(6016) 1991 PA11
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
K. Hornoch, and P. Kusnirak, Ondrejov Observatory; A. Aznar, Isaac Aznar
Observatory, Centro Astronomico del Alto Turia, Aras de los Olmos, Spain; D.
Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; W. Cooney,
Starry Night Observatory, Columbus, TX, U.S.A.; and R. Montaigut and A. Leroy,
OPERA Observatory, France, report that photometric observations taken with a
0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope at
the Ondrejov Observatory, a 0.35-m telescope at the Isaac Aznar Observatory, a
0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.43-m telescope at
the Starry Night Observatory, and a 0.20-m telescope at the OPERA Observatory
during 2016 Aug. 25-Sept. 5 reveal that minor planet (6016) is a binary
system with an orbital period of 21.33 Â± 0.02 hr. The primary shows a
period of 2.8028 Â± 0.0002 hr and has a lightcurve amplitude of 0.07 mag at
solar phases 18-23 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.04- to 0.09-magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.20 Â± 0.03.

2016 September 6 (CBET 4316) Daniel W. E. Green [2016-09-06 06:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· A current solution for this one:
http://www.asu.cas.cz/~asteroid/06016_porb.png
http://www.asu.cas.cz/~asteroid/06016_p1.png

More high-quality data for the secondary event in particular (it shows somewhat "unstable" behaviour, which I assume is just due to observational errors and not a real feature, but it would be good to nail down it with more data) would be still good, and further observations of the primary event will refine the P_orb estimate in particular. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9- 6 4.14 0.262
2016- 9- 7 1.47 0.262
2016- 9- 7 22.80 0.262
2016- 9- 8 20.13 0.262
2016- 9- 9 17.46 0.262
2016- 9-10 14.79 0.262
2016- 9-11 12.12 0.262
2016- 9-12 9.45 0.262
2016- 9-13 6.78 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2016- 9- 5 17.48 0.762
2016- 9- 6 14.81 0.762
2016- 9- 7 12.14 0.762
2016- 9- 8 9.47 0.762
2016- 9- 9 6.80 0.762
2016- 9-10 4.13 0.762
2016- 9-11 1.46 0.762
2016- 9-11 22.79 0.762
2016- 9-12 20.12 0.762
2016- 9-13 17.45 0.762

Clear Skies, Petr [2016-09-05 08:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start a run at 03:40 UT.

Don [2016-09-02 00:45, Sugarloaf] Message sent to observers

· I obtained another data set last night (Aug. 31 - Sep. 01, 21:14 - 01:55 UT).

Vladimir [2016-09-01 08:11, Sopot AO]

· Vladimir Benishek took four nights for this new target from Sopot during August 25-30. His data suggest a period of 2.80 h, but there are apparent deviations. Their nature is not clear yet, more data are needed. Vladimir will need a help from other stations: errors < 0.02 mag and full nights are needed (don't bother in less ideal circumstances).

Clear Skies, Petr [2016-08-30 11:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· I obtained the data on this new target on 3 consecutive nights: Aug. 24-25, 21:36-01:16 UT; Aug. 25-26, 21:33-02:22 UT; Aug. 26-27, 21:28-02:32 UT.

Vladimir [2016-08-28 08:46, Sopot AO]

(2298) Cindijon (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on six nights, supported with one night by Fred Vachier with the telescope in Reunion:
http://www.asu.cas.cz/~asteroid/02298.png
Object closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-12-06 13:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this one at Dec 5, 15:44 UT [2016-12-05 14:17, Les Makes]

· Started this at 00:20 UT.
Don [2016-11-28 00:34, Sugarloaf]

· Started this new target on No. 11 UT.
Don [2016-11-11 20:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

(6488) Drebach (Finished) [Add new note]
· This new target was done by Julian Oey from Leura and by Roger Groom from Perth: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06488.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian and Roger.

Cheers, Petr [2016-11-28 09:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 11/23 and 11/25 from Perth. [2016-11-26 04:12, Blue Mountains Obs] Message sent to observers

· Started a new target 11/18,11/21,and 11/22 period found 4.1278hr. [2016-11-23 01:58, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(15267) Kolyma (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on three nights: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/15267.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2016-11-21 11:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target Nov. 11 UT.

Don [2016-11-11 20:37, Sugarloaf]

(5279) Arthuradel (Finished) [Add new note]
· Fred Vachier did this new target from Reunion: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05279.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-11-09 11:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 16h to 00h UT (11/5) [2016-11-06 08:15, Les Makes]

· I plan to do it tonight. from 16h to 00h00 UT. Fred [2016-11-01 09:25, Les Makes]

· Come back to this target, and stay few nights, Fred [2016-10-19 13:56, Les Makes]

· Starting this one tonight. [2016-10-14 11:20, Les Makes]

(50403) 2000 CB114 (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/50403.png
http://www.asu.cas.cz/~asteroid/50403_nsp.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work again Don.

Petr [2016-11-08 22:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:10 UT.
Don [2016-11-08 02:35, Sugarloaf]

· Started this one at 01:15 UT.
Don [2016-11-07 03:33, Sugarloaf]

· Started this new target on Nov 5.
Don [2016-11-06 19:23, Sugarloaf] Message sent to BinAstPhotSurvey conference

(7160) Tokunaga (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on four nights: Good solution, excellent coverage, no deviation.
http://www.asu.cas.cz/~asteroid/07160.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2016-11-08 19:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a third session on this tonight at 01:15 UT.
DOn [2016-11-07 03:31, Sugarloaf]

(65433) 2002 TX238 (Finished) [Add new note]
· observed on 10/25, 11/02, 11/03 [2016-11-06 05:42, Blue Mountains Obs] Message sent to observers

· Julian Oey has done this new target: Unique solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/65433.png
Object closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-11-06 00:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 10/25, 11/02, 11/03 [2016-11-05 05:08, Blue Mountains Obs] Message sent to observers

· observed on 13/10 and 14/10. 6.5932h and 0.59m amplitude. [2016-10-15 21:24, Blue Mountains Obs]

· too noisy, out of my capabilities. [2016-10-14 09:36, Les Makes]

· Starting this one at 16:30 UT. [2016-10-13 14:44, Les Makes]

· start a new target. period of 5h found [2016-10-12 07:34, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3203) Huth (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/03203.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don again.

Cheers, Petr [2016-11-02 07:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this last night, and plan to observe it again tonight at 02:00 UT.
Don [2016-10-26 01:32, Sugarloaf]

(2709) Sagan (Finished) [Add new note]
· Don Pray did this return "prime suspect" from Sugarloaf Mountain on three nights: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02709_b6.png
Well, with the amplitude 0.63 mag now, it's not a "prime suspect" any longer. Apparently we observed it at higher latitude aspects in the previous two apparitions when the amplitude was lower ....

Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2016-11-02 07:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run at 02:05 UT.
Don [2016-10-26 01:30, Sugarloaf] Message sent to observers

· Plan to start this at 02:10 UT.
Don [2016-10-25 00:54, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This "prime suspect" (though being somewhat on the tail of the binary parameters distribution) was done by Julian from Leura on 3 good nights, supported with one shorter night by Peter Veres from Modra: unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/02709_b1.png
Done in the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-02-07 14:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 10:27UT to 15:16UT 02/05 [2011-02-07 04:59, Blue Mountains Obs] Message sent to observers

· Starting observation of this object at 22:00 UT.
Peter. [2011-02-06 22:17, Modra]

· observed on 02/01 and 01/31 @ about 11UT for about 7 hours. Period of 5.26h as per previous results. [2011-02-02 04:15, Blue Mountains Obs] Message sent to observers

· Started observation at 11UT 01/30. [2011-01-31 05:50, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· David has done this one from Hunters Hill: Unique solution, double coverage, no deviation. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-03-05 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-03-03 from 11:14UT to 18:29UT in good conditions. Period refined to 5.258 +/- 0.002hrs with an amplitude of 0.32 +/- 0.01mag. No deviations detected in the plot. [2008-03-03 21:08, HuntersHill] Message sent to observers

· Observed 2008-03-01 from 12:16UT to 18:31UT in good conditions. Data reveals a period of 5.19 +/- 0.02hrs with an amplitude of 0.36 +/- 0.01mag. [2008-03-01 20:58, HuntersHill] Message sent to BinAstPhotSurvey conference

(97679) 2000 GG2 (Finished) [Add new note]
· Unsuccessfull attempt, it's too noisy data from Les Makes Reunion. Petr [2016-10-14 07:29, Ondrejov]

· Out of my capabilities. [2016-10-13 14:43, Les Makes] Message sent to observers

· I plan to do it tonight for 8h. begin at 16:22 UT [2016-10-12 09:32, Les Makes] Message sent to BinAstPhotSurvey conference

(44142) 1998 HU96 (Finished) [Add new note]
· Target closed (too high noise for the BinAstPhotSurvey).
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2016-10-13 12:05, Ondrejov]

· observed on 09/04, 09/05, 09/10, 09/11, 09/16 and 09/19 bimodal lightcurve of period 10.7910 h and 1.12m amplitude. [2016-09-22 10:03, Blue Mountains Obs] Message sent to observers

· observed 08/31, longish period >30h [2016-09-01 10:34, Blue Mountains Obs]

· start a new target 08/28 at 13:46 for a short 1 hour duration. [2016-08-30 11:48, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(17325) 1978 QW1 (Finished) [Add new note]
· Target closed (incomplete double coverage).
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2016-10-13 11:57, Ondrejov]

· more data taken on 09/23 and 09/25 to obtain more of the 0.7 to 0.9 phase. [2016-09-26 06:46, Blue Mountains Obs] Message sent to observers

· more data on 09/10 and 09/11 but still miss the 0.7-0.9 phase
Period found to be 6.448h [2016-09-13 07:05, Blue Mountains Obs]

· observed 09/05 at 10:14UT for 10 hours and 09/06 at 10:47 for 4.5 hours. period is 6.446 [2016-09-07 08:40, Blue Mountains Obs] Message sent to observers

· starting to observe this new target from 13:15UT 09/04. [2016-09-05 10:18, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(12867) Joeloic (Finished) [Add new note]
· Target closed,
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2016-10-13 11:46, Ondrejov]

· observed on 09/19 from 09:53 to 17:21 UT. no clear amplitude of lightcurve showing. possible long rotation period but very low amplitude. [2016-09-22 09:52, Blue Mountains Obs] Message sent to observers

· observed on 09/06 and 09/11 . [2016-09-13 06:20, Blue Mountains Obs]

· New target observed from 12:14 to 19:00 UT on 09/04. [2016-09-05 10:48, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(10398) 1997 UP8 (Finished) [Add new note]
· Another new target done by Fred Vachier with the telescope in Reunion: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/10398.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-10-10 10:43, Ondrejov] Message sent to BinAstPhotSurvey conference

(48469) 1991 TQ1 (Finished) [Add new note]
· Another new target done by Don Pray from Sugarloaf Mountain: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/48469.png
Object done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-10-09 06:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this at 02:15 UT.
Don [2016-10-06 00:53, Sugarloaf]

· Plan to start this one at 02:20 UT.
Don [2016-10-05 01:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

(34694) 2001 MK18 (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique solution, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/34694.png
Done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2016-10-09 06:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:20 UT.
Don [2016-10-07 00:38, Sugarloaf]

· Started this new target at 00:30 UT.
Don [2016-10-06 00:51, Sugarloaf]

(16402) Olgapopova (Finished) [Add new note]
· Fred Vachier did this new target with their new robotic telescope in Reunion: Good solution and coverage, no deviation.
http://www.asu.cas.cz/~asteroid/16402.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Fred.

Cheers, Petr [2016-10-09 06:17, Ondrejov] Message sent to BinAstPhotSurvey conference

(15350) Naganuma (Finished) [Add new note]
· Vladimir Benishek did this "prime suspect" from Sopot in its current 3rd apparition, saw no deviation. Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-10-07 09:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· This return "prime suspect" was observed by Marek and coll. from Skalnate Pleso and by Kamil from here in January-February. It has shown a much lower amplitude in this 2nd apparition than in the 1st apparition, apparently the asteroid's aspect was closer to pole-on in this apparition:
http://www.asu.cas.cz/~asteroid/15350_b0.png
http://www.asu.cas.cz/~asteroid/15350.png
No significant deviation from the single periodicity seen in this year's data. Target closed for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2010-03-07 16:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt at 0040 UT. Weather good. Hope to run to 0700 UT. Joe [2010-02-18 00:42, Dark Sky & PROMPT] Message sent to observers

· Observing this one from 17:45 UT. Hoping that weather will hold... Best wishes, Kamil [2010-02-16 17:46, Ondrejov]

· We observed this one as a returning "prime suspect" in two nights on Jan 19 and 21. Data sent to Peter K.
http://www.asu.cas.cz/~asteroid/15350_b0.png
Marek [2010-01-25 11:35, SkalnatePleso] [Remove]
Message sent to observers

· This one has been worked extensively by Don Pray from Carbuncle Hill, by Walt, John and Dirk from SRO, and by David Higgins from Hunters Hill. The suspicious attenuation seen in the first night have not been confirmed, all but the few points of the first night fit well with the single period of 2.5835 h, see
http://www.asu.cas.cz/~ppravec/naganuma.png
It is a unique solution, the object finished for the Survey. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-11-21 17:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Unless an attenuation is seen, this will be my last run on this.

Don [2005-11-20 22:20, CarbuncleHill]

· I started this around 00:00 (11/19). Still looking for that elusive attenuation.

Don [2005-11-19 01:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Open again tonight and getting data on this target as well as 9948. This will likely be the last night for Hunters Hill until after Full moon. [2005-11-12 11:09, HuntersHill]

· I'll do a final run (for me) on this tonight. [2005-11-11 21:06, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Obtained data last night (11-11-2005). Data sent to Petr. I was following 3 targets with one scope - I think 2 shoudl be the absolute maximum...... [2005-11-11 20:58, HuntersHill]

· I'll be trying this tonight, weather permitting.

Don [2005-11-10 22:21, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· New data of 2005-11-09.5 by David Higgins from Hunters Hill joined in to the five nights by Don and one night from SRO. No attenuation in the new data. The six of the seven nights without an attenuation have a total coverage of 24 h now. It is still worthwhile to attempt to catch it on a couple more nights on it until November 12.

The data folded with the 2.582-h period see
http://www.asu.cas.cz/~ppravec/naganuma_shortpc.png

Petr [2005-11-10 16:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run at about 03:30 UT at SRO. [2005-11-10 03:10, Sonoita]

· Started a run on this target tonight (split scope operations between this target and 5477) [2005-11-09 10:41, HuntersHill] Message sent to BinAstPhotSurvey conference

· I should be able to do a run on this tonight.

Don [2005-11-08 20:04, CarbuncleHill]

· Don,

We have started a run on 15350 now as well. Started at UT 3:15. If your weather closes you out, hopefully we will be able to continue your run for you. Unfortunately our weather is a bit iffy too.

-Walt [2005-11-07 12:31, Sonoita] Message sent to BinAstPhotSurvey conference

· Don,

We have started a run on 15350 now as well. Started at UT 3:15. If your weather closes you out, hopefully we will be able to continue your run for you. Unfortunately our weather is a bit iffy too.

-Walt [2005-11-07 03:20, Sonoita] Message sent to BinAstPhotSurvey conference

· Attempting this in "partly cloudy" conditions. Might get lucky.

Don [2005-11-06 00:27, CarbuncleHill]

· I'm trying to take a 3hrs+ run for this object this night.
I hope these data will help Don to solve an attenuation...

Marian [2005-11-05 00:47, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· After two nights on this, there was a suggestion of an attenuation on one night. So, once again, help with this from a different longitude would be very helpfull. See part of Petr's note to me:

>>>>Don,

Yes, the short period of 2.58 hr appears to be a unique solution,
http://www.asu.cas.cz/~ppravec/naganuma_shortpc.png
The attenuation seen on 2005-11-03 cannot be a tri- or quad-modal
lightcurve.
http://www.asu.cas.cz/~ppravec/naganuma_longpc.png
(where the long period there is just for plotting purpose at this time)

So, it looks really interesting. Of course, we need to detect the
attenuation again, to confirm it's real and to derive its period. You
may appreciate a help by others with this one as well...<<<< [2005-11-04 18:44, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll have a first look at this tonight. [2005-11-02 22:49, CarbuncleHill]

(6581) Sobers (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique solution, sufficient coverage, no deviation.
http://www.asu.cas.cz/~asteroid/06581.png
Object done.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-10-06 06:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will start this at 02:20 UT.
Don [2016-10-05 01:46, Sugarloaf]

· I observed this on Sep 25 and plan to tonight.
Don [2016-09-26 01:08, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target on Sep 23.
Don [2016-09-24 01:39, Sugarloaf]

(11386) 1998 TA18 (Finished) [Add new note]
· This new target was worked by Romain Montaigut, Arnaud Leroy and Christophe Gillier from OPERA, by Don Pray from Sugarloaf Mountain and by Peter Kusnirak from here: Unique solution, nothing suspicious.
http://www.asu.cas.cz/~asteroid/11386.png
Closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-10-04 09:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night from OPERA.
Romain, Christophe and Arnaud [2016-10-03 10:50, OPERA]

· Observing from 20 UT for two hours. Peter K. [2016-09-29 19:02, Ondrejov] Message sent to observers

· We observed this new target from OPERA on the night of Sept. 23 to 24. [2016-09-28 06:53, OPERA]

· Planning to start this new target at 00:35, Sep 28 UT.
Don [2016-09-27 23:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

(12332) 1992 UJ6 (Finished) - slow rotator [Add new note]
· This new target was done by Hana Kucakova, Jan Vrastil, Kamil Hornoch and Peter Kusnirak from here: Unique solution for the relatively long period from the precisely linked data.
http://www.asu.cas.cz/~asteroid/12332.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-09-13 12:14, Ondrejov] Message sent to BinAstPhotSurvey conference

(20912) 4129 P-L (Finished) [Add new note]
· This new target was worked by Hana Kucakova, Jan Vrastil and Kamil Hornoch from here: An U = 2 solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/20912.png
http://www.asu.cas.cz/~asteroid/20912_nsp.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort on the low-amplitude object.

Petr [2016-09-13 11:07, Ondrejov] Message sent to BinAstPhotSurvey conference

(7295) Brozovic (Finished) [Add new note]
· Vasilij Chiorny has done this new target from Kharkiv: Unique period, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/07295.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-09-09 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this new target on 06/07 and 07/08 Sept 2016.
Period of rotation 3.35 hours and ampl 0.4 mag.
Vasilij Ch. [2016-09-08 01:38, Kharkiv]

(5417) Solovaya (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain and by Vasilij Chiorny from Kharkiv: An U = 2+ solution, good coverage, no deviation.
http://www.asu.cas.cz/~asteroid/05417.png
http://www.asu.cas.cz/~asteroid/05417_nsp.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2016-09-06 07:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one tonight 2/3 Sept from 20:00 UT to 01:20 UT
Vasilij Ch. [2016-09-03 01:24, Kharkiv] Message sent to observers

· I plan to start this at 03:40 UT.
Don [2016-09-02 00:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target on Aug 30 UT.
Don [2016-08-30 19:25, Sugarloaf]

(16338) (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: An U = 2 solution, no significant deviation.
http://www.asu.cas.cz/~asteroid/16338.png
http://www.asu.cas.cz/~asteroid/16338_nsp.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don on the low-amplitude object.

Petr [2016-09-03 07:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 02:10 UT.
Don [2016-08-09 01:30, Sugarloaf]

· Started this Aug 7 and plan to run again tonight, Aug 8 UT.
Don [2016-08-08 01:50, Sugarloaf] Message sent to BinAstPhotSurvey conference

(17723) 1997 YA4 (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: An U = 2 solution, no significant deviation.
http://www.asu.cas.cz/~asteroid/06514.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Don.

Petr [2016-09-02 07:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target Aug 27.
Don [2016-08-27 20:09, Sugarloaf]

(6514) Torahiko (Finished) [Add new note]
· This new target was done by Peter Kusnirak, Hana Kucakova and Kamil Hornoch from here and by Don Pray from Sugarloaf Mountain: An U = 2 solution, no significant deviation.
http://www.asu.cas.cz/~asteroid/06514.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort folks.

Petr [2016-09-02 07:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done, to be closed after completing linkages. Petr [2016-08-02 06:40, Ondrejov]

· Will start this at 02:50 UT.
Don [2016-07-12 01:40, Sugarloaf] Message sent to observers

· I did a run on this one on June 26 UT.
Don [2016-06-28 02:11, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this new target tonight. Peter K. [2016-06-27 22:38, Ondrejov]

(5481) Kiuchi (Finished) [Add new note]
· observed on 08/31 from 13:46 to 17:10UT [2016-09-01 10:14, Blue Mountains Obs] Message sent to observers

· observed on 08/25, 08/27, 08/28. [2016-08-30 12:20, Blue Mountains Obs]

· observed 08/25 from 13:32 UT for 3 hour [2016-08-26 11:19, Blue Mountains Obs]

· observed on 06/05, 06/11,06/14, 06/16 [2016-06-18 07:43, Blue Mountains Obs] Message sent to observers

· Further observations from 15.5UT to 19UT done on 06/07 [2016-06-09 06:57, Blue Mountains Obs]

· Observed on 05/29 and 05/30 [2016-06-06 05:34, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Done for the 3rd apparition. Petr [2015-04-27 11:40, Ondrejov]

· I started this at 00:43 and should catch the last half of the primary event.
Don [2015-04-22 00:44, Sugarloaf] Message sent to observers

· I started this at 00:55 to catch the 0.713 phase event.
Don [2015-04-18 00:56, Sugarloaf]

· It would be useful to take last data (for both events) for this apparition, with errors not greater than 0.02 mag; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 4- 8 2.38 0.213
2015- 4- 8 23.29 0.213
2015- 4- 9 20.20 0.213
2015- 4-10 17.11 0.213
2015- 4-11 14.02 0.213
2015- 4-12 10.93 0.213
2015- 4-13 7.84 0.213
2015- 4-14 4.75 0.213
2015- 4-15 1.66 0.213
2015- 4-15 22.57 0.213
2015- 4-16 19.48 0.213
2015- 4-17 16.39 0.213
2015- 4-18 13.30 0.213
2015- 4-19 10.21 0.213
2015- 4-20 7.12 0.213
2015- 4-21 4.03 0.213
2015- 4-22 0.94 0.213
2015- 4-22 21.85 0.213
2015- 4-23 18.76 0.213
2015- 4-24 15.67 0.213

Date/Time UTC (LTc.) Phase
--------------------------
2015- 4- 7 15.91 0.713
2015- 4- 8 12.82 0.713
2015- 4- 9 9.73 0.713
2015- 4-10 6.64 0.713
2015- 4-11 3.55 0.713
2015- 4-12 0.46 0.713
2015- 4-12 21.37 0.713
2015- 4-13 18.28 0.713
2015- 4-14 15.19 0.713
2015- 4-15 12.10 0.713
2015- 4-16 9.01 0.713
2015- 4-17 5.92 0.713
2015- 4-18 2.83 0.713
2015- 4-18 23.74 0.713
2015- 4-19 20.65 0.713
2015- 4-20 17.56 0.713
2015- 4-21 14.47 0.713
2015- 4-22 11.38 0.713
2015- 4-23 8.29 0.713
2015- 4-24 5.20 0.713

Clear Skies, Petr [2015-03-29 08:15, Ondrejov]

· New data by Joe Pollock with Prompt and by Kamil Hornoch, Jan Vrastil and Hana Kucakova from here joined in:
http://www.asu.cas.cz/~asteroid/05481_2015c_porb.png
http://www.asu.cas.cz/~asteroid/05481_2015c_p1.png
The primary event has got almost full double coverage this lunation, but it would be good to take one more coverage of the secondary event. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-20 19.29 0.214
2015- 3-21 16.20 0.214
2015- 3-22 13.11 0.214
2015- 3-23 10.02 0.214
2015- 3-24 6.93 0.214
2015- 3-25 3.84 0.214
2015- 3-26 0.75 0.214
2015- 3-26 21.66 0.214
2015- 3-27 18.57 0.214

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-21 5.75 0.715
2015- 3-22 2.66 0.715
2015- 3-22 23.57 0.715
2015- 3-23 20.48 0.715
2015- 3-24 17.39 0.715
2015- 3-25 14.30 0.715
2015- 3-26 11.21 0.715
2015- 3-27 8.12 0.715
2015- 3-28 5.03 0.715

Clear Skies, Petr [2015-03-20 08:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Taking full-night run for this one covering whole primary event. Best wishes, Kamil and Honza [2015-03-20 04:01, Ondrejov] Message sent to observers

· Taking full-night run for this one covering whole primary event. Best wishes, Kamil and Honza [2015-03-20 00:25, Ondrejov]

· Observed last night. Best wishes, Kamil and Hana K. [2015-03-19 05:21, Ondrejov] Message sent to observers

· Started this one from Prompt Tololo at 0000 UT to cover the secondary event at 0324 UT. Joe [2015-03-15 01:07, Dark Sky & PROMPT]

· New observations by Jan Vrastil and Kamil Hornoch from here and by Joe Pollock with Prompt added:
http://www.asu.cas.cz/~asteroid/05481_2015a_porb.png
http://www.asu.cas.cz/~asteroid/05481_2015a_p1.png
http://www.asu.cas.cz/~asteroid/05481_2015b_porb.png
http://www.asu.cas.cz/~asteroid/05481_2015b_p1.png
http://www.asu.cas.cz/~asteroid/05481_2015c_porb.png
http://www.asu.cas.cz/~asteroid/05481_2015c_p1.png
(I'll solve for the secondary rotational component outside events in the newest data later on, when additional data are available.)

Covering the 0.25-phase event once more and the 0.75-phase event twice in this lunation (which is the last one for this 3rd apparition of the binary) will be useful for modeling. Updated events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-14 16.90 0.213
2015- 3-15 13.82 0.213
2015- 3-16 10.74 0.213
2015- 3-17 7.66 0.213
2015- 3-18 4.58 0.213
2015- 3-19 1.50 0.213
2015- 3-19 22.42 0.213
2015- 3-20 19.34 0.213
2015- 3-21 16.26 0.213
2015- 3-22 13.18 0.213
2015- 3-23 10.10 0.213
2015- 3-24 7.02 0.213
2015- 3-25 3.94 0.213
2015- 3-26 0.86 0.213
2015- 3-26 21.78 0.213
2015- 3-27 18.70 0.213

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-15 3.39 0.715
2015- 3-16 0.31 0.715
2015- 3-16 21.23 0.715
2015- 3-17 18.15 0.715
2015- 3-18 15.07 0.715
2015- 3-19 11.99 0.715
2015- 3-20 8.91 0.715
2015- 3-21 5.83 0.715
2015- 3-22 2.75 0.715
2015- 3-22 23.67 0.715
2015- 3-23 20.59 0.715
2015- 3-24 17.51 0.715
2015- 3-25 14.43 0.715
2015- 3-26 11.35 0.715
2015- 3-27 8.27 0.715
2015- 3-28 5.19 0.715

Clear Skies, Petr [2015-03-14 10:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this one from Prompt Tololo at 0000 UT to cover the primary event at 0300 UT. Joe [2015-03-11 23:37, Dark Sky & PROMPT] Message sent to observers

· A run by Arnaud Leroy and coll. of 2015-02-10 has been added,
http://www.asu.cas.cz/~asteroid/05481_2015_porb.png
http://www.asu.cas.cz/~asteroid/05481_2015_p1.png

More data would be still useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3- 9 12.26 0.255
2015- 3-10 9.18 0.255
2015- 3-11 6.10 0.255
2015- 3-12 3.02 0.255
2015- 3-12 23.94 0.255
2015- 3-13 20.86 0.255
2015- 3-14 17.78 0.255
2015- 3-15 14.70 0.255
2015- 3-16 11.62 0.255
2015- 3-17 8.54 0.255
2015- 3-18 5.46 0.255
2015- 3-19 2.38 0.255
2015- 3-19 23.30 0.255
2015- 3-20 20.22 0.255
2015- 3-21 17.14 0.255
2015- 3-22 14.06 0.255
2015- 3-23 10.98 0.255
2015- 3-24 7.90 0.255
2015- 3-25 4.82 0.255
2015- 3-26 1.74 0.255
2015- 3-26 22.66 0.255
2015- 3-27 19.58 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3- 9 1.79 0.755
2015- 3- 9 22.71 0.755
2015- 3-10 19.63 0.755
2015- 3-11 16.55 0.755
2015- 3-12 13.47 0.755
2015- 3-13 10.39 0.755
2015- 3-14 7.31 0.755
2015- 3-15 4.23 0.755
2015- 3-16 1.15 0.755
2015- 3-16 22.07 0.755
2015- 3-17 18.99 0.755
2015- 3-18 15.91 0.755
2015- 3-19 12.83 0.755
2015- 3-20 9.75 0.755
2015- 3-21 6.67 0.755
2015- 3-22 3.59 0.755
2015- 3-23 0.51 0.755
2015- 3-23 21.43 0.755
2015- 3-24 18.35 0.755
2015- 3-25 15.27 0.755
2015- 3-26 12.19 0.755
2015- 3-27 9.11 0.755
2015- 3-28 6.03 0.755

Clear Skies, Petr [2015-03-04 09:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt Tololo at 0250 UT. Hope to get primary event centered at 0728 UT. Joe [2015-02-18 03:18, Dark Sky & PROMPT] Message sent to observers

· Got run from Prompt Tololo last night from 0120-0900 UT. Covered secondary event centered at 0620 with some short gaps. Will do it again tonight to get another secondary at 0312 UT. Joe [2015-02-15 18:59, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt Tololo 0345 UT to get outside of event light curve. Joe [2015-02-14 03:49, Dark Sky & PROMPT]

· More data would be useful for this return binary in its current 3rd apparition; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 2- 8 17.53 0.260
2015- 2- 9 14.43 0.260
2015- 2-10 11.34 0.260
2015- 2-11 8.24 0.260
2015- 2-12 5.15 0.260
2015- 2-13 2.05 0.260
2015- 2-13 22.95 0.260
2015- 2-14 19.86 0.260
2015- 2-15 16.76 0.260
2015- 2-16 13.67 0.260
2015- 2-17 10.57 0.260
2015- 2-18 7.47 0.260
2015- 2-19 4.38 0.260
2015- 2-20 1.28 0.260
2015- 2-20 22.19 0.260
2015- 2-21 19.09 0.260
2015- 2-22 15.99 0.260
2015- 2-23 12.90 0.260
2015- 2-24 9.80 0.260
2015- 2-25 6.71 0.260
2015- 2-26 3.61 0.260
2015- 2-27 0.51 0.260
2015- 2-27 21.42 0.260
2015- 2-28 18.32 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2015- 2- 8 7.09 0.760
2015- 2- 9 3.99 0.760
2015- 2-10 0.90 0.760
2015- 2-10 21.80 0.760
2015- 2-11 18.70 0.760
2015- 2-12 15.61 0.760
2015- 2-13 12.51 0.760
2015- 2-14 9.42 0.760
2015- 2-15 6.32 0.760
2015- 2-16 3.22 0.760
2015- 2-17 0.13 0.760
2015- 2-17 21.03 0.760
2015- 2-18 17.94 0.760
2015- 2-19 14.84 0.760
2015- 2-20 11.74 0.760
2015- 2-21 8.65 0.760
2015- 2-22 5.55 0.760
2015- 2-23 2.46 0.760
2015- 2-23 23.36 0.760
2015- 2-24 20.26 0.760
2015- 2-25 17.17 0.760
2015- 2-26 14.07 0.760
2015- 2-27 10.98 0.760
2015- 2-28 7.88 0.760
2015- 3- 1 4.78 0.760

Clear Skies, Petr [2015-02-02 09:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has taken the first three nights for this return binary in its current (3rd) apparition:
http://www.asu.cas.cz/~asteroid/05481_2015_porb.png
http://www.asu.cas.cz/~asteroid/05481_2015_p1.png

Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1-18 19.81 0.259
2015- 1-19 16.72 0.259
2015- 1-20 13.62 0.259
2015- 1-21 10.53 0.259
2015- 1-22 7.43 0.259
2015- 1-23 4.33 0.259
2015- 1-24 1.24 0.259
2015- 1-24 22.14 0.259
2015- 1-25 19.05 0.259
2015- 1-26 15.95 0.259
2015- 1-27 12.85 0.259
2015- 1-28 9.76 0.259
2015- 1-29 6.66 0.259
2015- 1-30 3.57 0.259
2015- 1-31 0.47 0.259
2015- 1-31 21.37 0.259

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1-18 9.35 0.759
2015- 1-19 6.26 0.759
2015- 1-20 3.16 0.759
2015- 1-21 0.06 0.759
2015- 1-21 20.97 0.759
2015- 1-22 17.87 0.759
2015- 1-23 14.78 0.759
2015- 1-24 11.68 0.759
2015- 1-25 8.58 0.759
2015- 1-26 5.49 0.759
2015- 1-27 2.39 0.759
2015- 1-27 23.30 0.759
2015- 1-28 20.20 0.759
2015- 1-29 17.10 0.759
2015- 1-30 14.01 0.759
2015- 1-31 10.91 0.759

Clear Skies, Petr [2015-01-18 06:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 04:00 UT.
Don [2015-01-17 01:53, Sugarloaf] Message sent to observers

· Planning to start this return binary at 04:20, Jan 14 UT.
Don [2015-01-13 23:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Continued monitoring of this return binary (2nd apparition) in the past lunation by Peter Kusnirak from here, Don Pray from Sugarloaf Mountain and Julian Oey from Leura.
http://www.asu.cas.cz/~asteroid/05481_13_porb.png
http://www.asu.cas.cz/~asteroid/05481_13_p1.png

Taking last data for the events would be useful before the apparition is over, but only with errors not greater than 0.02 mag; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-11-21 18.75 0.254
2013-11-22 15.65 0.254
2013-11-23 12.56 0.254
2013-11-24 9.46 0.254
2013-11-25 6.37 0.254
2013-11-26 3.27 0.254
2013-11-27 0.18 0.254
2013-11-27 21.08 0.254
2013-11-28 17.99 0.254
2013-11-29 14.89 0.254
2013-11-30 11.80 0.254
2013-12- 1 8.70 0.254
2013-12- 2 5.61 0.254
2013-12- 3 2.51 0.254
2013-12- 3 23.42 0.254
2013-12- 4 20.32 0.254
2013-12- 5 17.23 0.254
2013-12- 6 14.13 0.254
2013-12- 7 11.04 0.254
2013-12- 8 7.94 0.254
2013-12- 9 4.85 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2013-11-21 8.31 0.755
2013-11-22 5.21 0.755
2013-11-23 2.12 0.755
2013-11-23 23.02 0.755
2013-11-24 19.93 0.755
2013-11-25 16.83 0.755
2013-11-26 13.74 0.755
2013-11-27 10.64 0.755
2013-11-28 7.55 0.755
2013-11-29 4.45 0.755
2013-11-30 1.36 0.755
2013-11-30 22.26 0.755
2013-12- 1 19.17 0.755
2013-12- 2 16.07 0.755
2013-12- 3 12.98 0.755
2013-12- 4 9.88 0.755
2013-12- 5 6.79 0.755
2013-12- 6 3.69 0.755
2013-12- 7 0.60 0.755
2013-12- 7 21.50 0.755
2013-12- 8 18.41 0.755

Clear Skies, Petr [2013-11-19 14:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· observing tonight 11/06 covering 0.757 phase at 12.77UT. Good condition. [2013-11-06 13:19, Blue Mountains Obs] Message sent to observers

· Began run from Prompt Tololo at 0020 UT under good conditions. Hope to cover the 0.255 event centered at 0215 UT. Joe [2013-11-06 00:46, Dark Sky & PROMPT]

· Observed for 3 hours last night and part of the 0.75-phase event covered. Peter K. [2013-10-29 08:54, Ondrejov] Message sent to observers

· observed from 10:35 to 14:00 10/24. Late start and only got half of the event. [2013-10-26 04:20, Blue Mountains Obs]

· Started a run at 23:50, 2013-10-25 UT.
Don [2013-10-26 00:56, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 01:00 UT and should catch the 0.255 phase event.
Don [2013-10-23 01:55, Sugarloaf]

· This return binary was worked well in its current 2nd apparition by Peter Kusnirak, Kamil Hornoch and Jan Vrastil from here (9 nights, mostly partial or a supplementary target), supported with one night by Stefan Gajdos from Modra:
http://www.asu.cas.cz/~asteroid/05481_13_porb.png
http://www.asu.cas.cz/~asteroid/05481_13_p1.png

Monitoring events would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-10 23.29 0.255
2013-10-11 20.19 0.255
2013-10-12 17.09 0.255
2013-10-13 13.99 0.255
2013-10-14 10.89 0.255
2013-10-15 7.79 0.255
2013-10-22 6.99 0.255
2013-10-23 3.89 0.255
2013-10-24 0.79 0.255
2013-10-24 21.69 0.255
2013-10-25 18.59 0.255
2013-10-26 15.49 0.255
2013-10-27 12.39 0.255
2013-10-28 9.29 0.255
2013-10-29 6.19 0.255
2013-10-30 3.09 0.255
2013-10-30 23.99 0.255
2013-10-31 20.89 0.255
2013-11- 1 17.79 0.255
2013-11- 2 14.69 0.255
2013-11- 3 11.59 0.255
2013-11- 4 8.49 0.255
2013-11- 5 5.39 0.255
2013-11- 6 2.29 0.255
2013-11- 6 23.19 0.255
2013-11- 7 20.09 0.255
2013-11- 8 16.99 0.255
2013-11- 9 13.89 0.255
2013-11-10 10.79 0.255
2013-11-11 7.69 0.255
2013-11-12 4.59 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-22 17.47 0.757
2013-10-23 14.37 0.757
2013-10-24 11.27 0.757
2013-10-25 8.17 0.757
2013-10-26 5.07 0.757
2013-10-27 1.97 0.757
2013-10-27 22.87 0.757
2013-10-28 19.77 0.757
2013-10-29 16.67 0.757
2013-10-30 13.57 0.757
2013-10-31 10.47 0.757
2013-11- 1 7.37 0.757
2013-11- 2 4.27 0.757
2013-11- 3 1.17 0.757
2013-11- 3 22.07 0.757
2013-11- 4 18.97 0.757
2013-11- 5 15.87 0.757
2013-11- 6 12.77 0.757
2013-11- 7 9.67 0.757
2013-11- 8 6.57 0.757
2013-11- 9 3.47 0.757
2013-11-10 0.37 0.757
2013-11-10 21.27 0.757
2013-11-11 18.17 0.757

Clear Skies, Petr [2013-10-10 09:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:20 UT. Secondary event covered. Peter K. [2013-10-09 00:11, Ondrejov] Message sent to observers

· Observing from 18:40 UT. Peter K. [2013-10-07 22:34, Ondrejov]

· Observing it from 19:29 UT.
Stefan [2013-10-04 19:50, Modra]

· Observing as complementary target to 8306 from 19:15 UT. Peter K. [2013-10-03 19:27, Ondrejov] Message sent to observers

· First data for this return binary in its current first post-discovery apparition were taken by Peter Kusnirak, Kamil Hornoch and Jan Vrastil from here. The following decomposition utilizes P_1 and P_orb measurements from the discovery 2008 apparition:
http://www.asu.cas.cz/~asteroid/05481_13_porb.png
http://www.asu.cas.cz/~asteroid/05481_13_p1.png

One or two more coverages for each of the two events are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-10- 3 23.99 0.250
2013-10- 4 20.89 0.250
2013-10- 5 17.79 0.250
2013-10- 6 14.69 0.250
2013-10- 7 11.59 0.250
2013-10- 8 8.49 0.250
2013-10- 9 5.39 0.250
2013-10-10 2.29 0.250
2013-10-10 23.19 0.250
2013-10-11 20.09 0.250
2013-10-12 16.99 0.250
2013-10-13 13.89 0.250
2013-10-14 10.79 0.250
2013-10-15 7.69 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2013-10- 3 13.84 0.764
2013-10- 4 10.74 0.764
2013-10- 5 7.64 0.764
2013-10- 6 4.54 0.764
2013-10- 7 1.44 0.764
2013-10- 7 22.34 0.764
2013-10- 8 19.24 0.764
2013-10- 9 16.14 0.764
2013-10-10 13.04 0.764
2013-10-11 9.94 0.764
2013-10-12 6.84 0.764
2013-10-13 3.74 0.764
2013-10-14 0.64 0.764
2013-10-14 21.54 0.764
2013-10-15 18.44 0.764

Clear Skies, Petr [2013-10-03 05:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement on this one has been just released and its text is copied below for your convenience.

Peter

(5481) KIUCHI
P. Kusnirak and P. Pravec, Ondrejov Observatory; J. Oey, Leura, N.S.W.,
Australia; R. Stephens, Goat Mountain Astronomical Research Station, Yucca
Valley, CA, U.S.A.; M. Husarik, Skalnate Pleso Observatory; and J. Ries,
McDonald Observatory, report that photometric observations obtained during
Mar. 13 to Apr. 6 reveal that minor planet (5481) is a binary system with an
orbital period of 20.90 +/- 0.01 hr. The primary shows a period of 3.6196
+/- 0.0002 hr, and it has a lightcurve amplitude of 0.10 mag, suggesting a
nearly spheroidal shape. Mutual eclipse/occultation events indicate a
secondary-to-primary mean-diameter ratio of 0.33 +/- 0.02. The mean
absolute R magnitude is H = 12.98 +/- 0.1, assuming G = 0.15 +/- 0.2.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2008 CBAT
2008 April 15 (CBET 1339) Daniel W. E. Green [2008-04-15 20:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Peter and I have included new data by Julian from Leura and by Judit from McDonald. Current solution:
P_1 = 3.6196 +/- 0.0002 h
P_orb = 20.90 +/- 0.01 h
A_1 = 0.10 mag
D_2/D_1 = 0.33 +/- 0.02
http://www.asu.cas.cz/~asteroid/05481_all.png
http://www.asu.cas.cz/~asteroid/05481_p1.png
http://www.asu.cas.cz/~asteroid/05481_porb.png

It has been covered sufficiently. We will write an announcement for CBET tomorrow (when Peter is here in the office).

Cheers, Petr [2008-04-07 14:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 08:59UT to 17:17UT 2008-04-05. good condition with predicted primary event captured. [2008-04-05 22:43, Blue Mountains Obs]

· Observed from 09:17UT to 17:24UT 2008-04-04. Good condition and no events. [2008-04-05 06:10, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I observed the target from 5:30 through 9:20 UT. The sky stayed clear, but the seeing got bad around 8UT.

Judit [2008-04-04 12:06, McDonald Observatory] Message sent to observers

· Here is an ephemeris for next 4 days:

Date/Time UTC (LTc.) Phase
--------------------------
2008- 4- 4 18.59 0.242
2008- 4- 5 15.49 0.242
2008- 4- 6 12.39 0.242
2008- 4- 7 9.29 0.242
2008- 4- 8 6.19 0.242

Date/Time UTC (LTc.) Phase
--------------------------
2008- 4- 4 7.95 0.733
2008- 4- 5 4.85 0.733
2008- 4- 6 1.75 0.733
2008- 4- 6 22.65 0.733
2008- 4- 7 19.55 0.733
2008- 4- 8 16.45 0.733

Peter [2008-04-04 07:37, Ondrejov] Message sent to observers

· Started observing session at 5:30UT, 2008-04-04. The sky is decent. I hope to cover the whole event at phase 0.715. [2008-04-04 05:36, McDonald Observatory]

· Observed from 08:52UT to 12:26UT 2008-04-03 in good condition with the predicted event captured. [2008-04-03 23:53, Blue Mountains Obs] Message sent to observers

· Four new sessions were joined in (all are from Mar 31): one long from Leura, covering primary event, 2 short sessions from Skalnate Pleso covering secondary event and one from me obtained under variable haze conditions (part of secondary event). SPleso obtained one more session but it was degraded by faint background star and not used in composite LC. Last six points in Julian's session are probably in error.

I just updated images in my previous post with latest data. P1 and P2 are almost same, so feel free to use ephemeris bellow.

Peter [2008-04-01 14:20, Ondrejov] Message sent to observers

· Observed from 09:09UT to 17:57UT 2008-03-31 in good condition. Caught the whole primary event and the first half of secondary event. [2008-04-01 02:06, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This one started at 19 UT. I suppose 4 hr long run. The wind here is more and more stronger. [2008-03-31 22:01, SkalnatePleso] [Remove]
Message sent to observers

· Four new sessions were joined in: two of me from here (Mar 29.9 and 30.9), one from Julian Oey (Leura Obs., Mar 29.5) and one from Bob Stephens (GMARS, Mar 30.3). Julian has caught an event (primary?) 0.25-mag deep.

http://www.asu.cas.cz/~asteroid/05481.png
http://www.asu.cas.cz/~asteroid/05481_p1.png
http://www.asu.cas.cz/~asteroid/05481_p2.png

P1 is 3.618 h and already unique. P2 is ~20.9 h and should be supported with more sessions covering both events (especially the secondary one). Due to very low amplitude of primary's LC (~0.095 mag) data with errors <0.02 mag are needed. Here is an ephemeris for next 3 nights:

Date/Time UTC (LTc.) Phase
--------------------------
2008- 3-31 10.10 0.247
2008- 4- 1 6.98 0.247
2008- 4- 2 3.86 0.247
2008- 4- 3 0.74 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2008- 3-31 19.87 0.715
2008- 4- 1 16.75 0.715
2008- 4- 2 13.63 0.715
2008- 4- 3 10.51 0.715

Peter K. [2008-03-31 17:44, Ondrejov] Message sent to observers

· started observation 09:08UT and finshed at 14:56UT 2008-03-29. Not quite a full session but good condition. Julian [2008-03-29 21:57, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Just started second night on this. I hope I will catch another event tonight to improve current solution. Peter [2008-03-29 19:10, Ondrejov] Message sent to observers

· I observed this one for 4.5 hours (from 19:15 to 23:45 UT) tonight and there seems to be some attenuation (0.3 mag deep) in my data. Joining in with Julian's data (3 nights) I'm getting P_rot ~3.8 h and P_orb in range of 21 hours. Both periods are still unclear as primary's LC is very flat (ampl. 0.07 mag). Here is its current status (very preliminary solution!):

http://www.asu.cas.cz/~asteroid/05481.png

More observations are needed to derive both periods. Due to flat primary's LC only quality data (with errors <0.02 mag) can help.

Peter [2008-03-29 00:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observation at 09:21 and finished at 12:53UT 2008-03-26. Julian [2008-03-27 09:37, Blue Mountains Obs]

· started on this new target at 11:28UT and finished at 13:52UT 2008-03-13. Unable to determine the period yet but appears to by > 7hours. Julian [2008-03-14 04:57, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(25164) 1998 SJ62 (Finished) [Add new note]
· This new target was worked by Don Pray from Sugarloaf Mountain, by Marek Husarik from Skalnate Pleso, and by Romain Montaigut and Arnaud Leroy from OPERA:
http://www.asu.cas.cz/~asteroid/25164.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2016-08-31 11:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this object at 20:20 UT. Gabo [2016-08-11 20:39, SkalnatePleso] [Remove]
Message sent to observers

· Observed last night from France on Aug 09-10, 21:15-02:05 UT
Romain [2016-08-10 16:57, OPERA]

· Don observed this target on three nights but its period seems to be close to 12 hours (with amplitude ~0.7 mag). Help from another longitude is needed to resolve the period. Errors <0.03 mag as usual. Peter K. [2016-08-09 10:51, Ondrejov] Message sent to observers

· This one once again from 20 UT.
Marek [2016-08-08 22:25, SkalnatePleso] [Remove]

· Trying to observe this one (from ~20 UT) as a test object with new ccd camera.
Marek [2016-08-07 21:12, SkalnatePleso] [Remove]
Message sent to observers

· Starting this new target at 02:30 UT.
Don [2016-08-03 01:53, Sugarloaf] Message sent to BinAstPhotSurvey conference

(52587) 1997 PD (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain and by Kamil Hornoch, Hana Kucakova and Peter Kusnirak from here: an U = 2 solution, with some low-amplitude deviations seen, but below the effective resolution limit of the Survey.
http://www.asu.cas.cz/~asteroid/52587.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-08-30 12:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for two hours tonight (19:50 - 21:40 UT). Peter K. [2016-08-13 23:18, Ondrejov] Message sent to observers

· Plan to start this at 02:20 UT.
Don [2016-08-09 01:33, Sugarloaf]

· Observed this one tonight from 20:20 UT to 02:15 UT. Best wishes, Kamil [2016-08-08 02:20, Ondrejov] Message sent to observers

· Started this last night (Aug 7) and will run it again Aug 8 UT.
Don [2016-08-08 01:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

(22135) 2000 UA100 (Finished) - slow rotator [Add new note]
· Don Pray did this new target from Sugarloaf Mountain. His accurately linked data suggest a period about 400 hours (U = 2).
http://www.asu.cas.cz/~asteroid/22135.png
http://www.asu.cas.cz/~asteroid/22135_nsp.png
Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Don on the tough object.

Petr [2016-08-30 11:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've done three sessions on this so far and plan another tonight at 03:30 UT.
Don [2016-07-12 01:46, Sugarloaf]

(122463) 2000 QP148 (Finished) - slow rotator [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain, supported with two nights by Vladimir Benishek from Sopot:
http://www.asu.cas.cz/~asteroid/122463.png
Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don and Vladimir on the slow rotator.

Petr [2016-08-30 10:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 03:40 UT.
Don [2016-07-12 01:41, Sugarloaf]

· I got a session on this last night (July 05-06, 21:14-01:27 UT).

Vladimir [2016-07-06 09:45, Sopot AO] Message sent to observers

· Observed last night from Sopot (June 29-30, 21:52-01:24 UT).
Vladimir [2016-06-30 10:51, Sopot AO]

· Plan to start a run on this at 04:20 UT.
Don [2016-06-30 00:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target on Saturday, June 26.
Don [2016-06-28 13:00, Sugarloaf]

(23721) 1998 HQ27 (Finished) [Add new note]
· Vladimir Benishek did this new target from Sopot: U = 3-, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/23721.png
Target done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Petr [2016-08-30 08:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I obtained a new session on Aug. 04-05, 20:44-02:06 UT.

Vladimir [2016-08-05 10:46, Sopot AO]

· Another session obtained on Aug. 03-04, 20:49-01:55 UT.

Vladimir [2016-08-04 13:59, Sopot AO]

· I got another session on this one (July 31-Aug 01, 21:04-01:49 UT).

Vladimir [2016-08-01 09:53, Sopot AO]

· Observed on July 30-31, 21:04-01:57 UT.

Vladimir [2016-07-31 11:19, Sopot AO] Message sent to BinAstPhotSurvey conference

(5681) Bakulev (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain: Unique solution, acceptable coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/05681.png
Done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Petr [2016-08-30 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 04:35 UT.
Don [2016-08-09 01:35, Sugarloaf]

· I did a run on this new target on Aug 4, and plan to do it again on Aug 5.

Don [2016-08-04 22:25, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4775) Hansen (Finished) [Add new note]
· This new target was done by Romain Montaigut and Arnaud Leroy from OPERA Observatory: Good solution and coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04775.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Romain and Arnaud.

Cheers, Petr [2016-08-30 08:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· This target is done after 4 nights from OPERA. Peter K. [2016-08-26 13:18, Ondrejov] Message sent to observers

· We observed this new target on 3 nights (Aug 06, 07 and 12) and plan to run it again tonight. Period is about 3.15h with amplitude of 0.17mag.
Romain and Arnaud [2016-08-13 22:16, OPERA]

(4477) Kelley (Finished) [Add new note]
· This new target was done by Vladimir Benishek from Sopot and by Vasilij Chiorny and O. Mikhalchenko from Kharkiv: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04477.png
Done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2016-08-30 08:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one tonight (Aug 23/24) from 18:30 UT to 23:35 UT
Vasilij Ch. [2016-08-24 00:07, Kharkiv] Message sent to observers

· New data obtained on Aug. 15-16, 20:34-02:10 UT.

Vladimir [2016-08-16 11:29, Sopot AO]

· I obtained two sessions on this target (Aug. 13-14, 20:34-02:12 UT and Aug. 14-15, 20:33-02:13 UT).

Vladimir [2016-08-15 09:32, Sopot AO] Message sent to BinAstPhotSurvey conference

(25738) 2000 AO198 (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain: A good U = 3- solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/25738.png
http://www.asu.cas.cz/~asteroid/25738_nsp.png
Target closed now.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work, Don.

Cheers, Petr [2016-08-04 08:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target on July 28 and plan to run it again tonight.
Don [2016-07-30 02:11, Sugarloaf]

(7530) Mizusawa (Finished) [Add new note]
· This new target was worked by Don Pray from Sugarloaf Mountain, supported by Romain Montaigut and Arnaud Leroy from OPERA Observatory and by Vladimir Benishek from Sopot: U = 2 solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/07530.png
http://www.asu.cas.cz/~asteroid/07530_nsp.png
Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don et al. on the low-amplitude object.

Petr [2016-08-01 07:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on June 30-July 01, 21:56-01:24 UT.
Vladimir [2016-07-02 15:54, Sopot AO]

· I'll be starting this one at 04:20 UT.
Don [2016-06-30 00:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start this one at 05:20 UT.
Don [2016-06-15 01:45, Sugarloaf]

· Started this new target on June 11 UT.
Don [2016-06-12 00:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

(19516) 1998 QF80 (Finished) [Add new note]
· This new target was worked by Amadeo Aznar, by Vladimir Benishek from Sopot and by Don Pray from Sugarloaf Mountain: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/19516.png
Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-08-01 06:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Ok, nice!

Last friday Petr suggested me to follow this object in next times:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 7-29 7.827 0.482
2016- 7-29 13.261 0.482
2016- 7-29 18.695 0.482
2016- 7-30 0.129 0.482
2016- 7-30 5.563 0.482
2016- 7-30 10.997 0.482
2016- 7-30 16.431 0.482
2016- 7-30 21.865 0.482
2016- 7-31 3.299 0.482
2016- 7-31 8.733 0.482
2016- 7-31 14.167 0.482
2016- 7-31 19.601 0.482
2016- 8- 1 1.035 0.482
2016- 8- 1 6.469 0.482

Regards. [2016-07-30 22:21, IAO-Isaac Aznar Obs.] Message sent to observers

· I observed this on July 30 UT. The object was (19516)1998 QF80 from Petr's list of targets.
Don [2016-07-30 21:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I have been observed this object since last tuesday, with 4 sessions data already collected. I also have one more session on 29-30 July. [2016-07-30 11:44, IAO-Isaac Aznar Obs.] Message sent to observers

· We observed this target too, on July 29-30 (h 20.40-03.00 UT) [2016-07-30 11:14, Univ-Siena IT] Message sent to BinAstPhotSurvey conference

· I observed this new target on July 29-30 (21:03-01:57 UT).

Vladimir [2016-07-30 10:37, Sopot AO]

(37586) 1991 BP2 (Finished) - slow rotator [Add new note]
· Julian Oey has observed this new target from Leura on 25 nights, revealed it to be a slow rotator with a period about 900 hours.
http://www.asu.cas.cz/~asteroid/37586.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian!

Cheers, Petr [2016-07-25 11:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· 22 additional nights of observations revealed a period of 838h with amplitude of 0.9m [2016-03-31 10:42, Blue Mountains Obs] Message sent to observers

· New target observed for 7 nights and found to be a very long period object of >500h [2016-02-27 12:40, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(54697) 2001 FA70 (Finished) - binary suspect, confirmation needed [Add new note]
· Despite our extensive effort from Sugarloaf Mountain, Ondrejov and Sopot, we have not been able to get a satisfactory solution for period of the apparent deviations in this one. The main (primary) period is well detected:
http://www.asu.cas.cz/~asteroid/54697_p1.png
A tentative solution for the second period that explains most, but not all of the apparent attenuations:
http://www.asu.cas.cz/~asteroid/54697_porb.png
Brian Warner took another extensive dataset (partly around the full moon, resulting in noisier data on some nights), resolved the main period as well, but I am not getting a satisfactory solution for period of the apparent deviations using his data either.

Ok, we close this target. Hopefully it will be solved in the future.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Best, Petr [2016-07-18 07:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:35 UT.
Don [2016-07-12 01:37, Sugarloaf] Message sent to observers

· Observed on July 01-02, 19:47-00:56 UT.
Vladimir [2016-07-02 15:51, Sopot AO]

· Plan to start this at 03:50 UT.

Don [2016-06-30 00:41, Sugarloaf]

· Observed for almost 2 hours tonight before clouds came. Peter K. [2016-06-29 00:26, Ondrejov] Message sent to observers

· Started this at 01:40 UT.
Don [2016-06-15 01:44, Sugarloaf]

· I did a run on this on June 11 UT.
Don [2016-06-12 00:16, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 02:30 UT.
Don [2016-06-10 02:27, Sugarloaf]

· This new target has been observed by Don Pray from Sugarloaf Mountain and by Peter Kusnirak, Kamil Hornoch and Hana Kucakova from here. There are apparent drops that may be mutual events in a binary system. A tentative decomposition:
http://www.asu.cas.cz/~asteroid/54697_p1.png
http://www.asu.cas.cz/~asteroid/54697_porb.png
(While P_1 is unique, there are many possible values for the orbital period.)

More data are needed to confirm. We will not be able to observe it here at Ondrejov on coming nights due to our other high priority target, and Don's observations alone may not be sufficient due to the short June nights. We encourage others to help out. Errors not greater than 0.02 mag and sessions longer than 2 hours are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2016-06-06 11:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night for 3 hours (22-1 UT). Peter K. [2016-06-04 06:18, Ondrejov] Message sent to observers

· Started this new target on June 1 UT.
Don [2016-06-01 19:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1293) Sonja (Finished) [Add new note]
· This "prime suspect" was observed by Vladimir Benishek and by Amadeo Aznar in its current 3rd apparition: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/01293_b6.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2016-07-11 12:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Three sessions were obtained on this "prime suspect" on July 07-08 (22:09-01:25 UT), July 08-09 (21:54-01:17 UT) and July 09-10 (22:33-01:31 UT).

Vladimir [2016-07-11 09:57, Sopot AO]

· The returning "prime suspect" has been observed by Don Pray from Carbuncle Hill (10 nights) and by Michal, Gabo, and Marek from Skalnate Pleso (2 nights). The data are somewhat marginal, but the period estimate has been much improved. A few deviating points are considered to be artifacts. It is closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2008-03-04 15:50, Ondrejov] Message sent to observers

· I started this around 00:15. It's dimmer than predicted and so hard to get a decent s/n.
Don [2008-02-25 00:38, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started this at 00:50 UT.
Don [2008-02-15 00:56, CarbuncleHill]

· This object is observed this night from 19 UT. Gabo [2008-02-12 15:11, SkalnatePleso] [Remove]
Message sent to observers

· I started this at 02:30 UT. Wind was a problem earlier, and may still be.
Don [2008-02-12 02:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this at 01:00 UT.
Don [2008-02-09 01:14, CarbuncleHill]

· Observing from 21:25 UT in relatively good conditions. Michal [2008-02-07 21:29, SkalnatePleso] [Remove]
Message sent to observers

· Starting a run at 01:30 UT.
Don [2008-02-03 01:21, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this at 02:00 UT.
Don [2008-01-31 01:59, CarbuncleHill]

· Starting this at 01:50 UT.
Don [2008-01-29 01:48, CarbuncleHill]

· Don has observed this returning "prime suspect" (i.e., a BinAstPhotSurvey asteroid with P and A in the range where binaries predominate) on three nights in the past lunation. His observations have been noisy because of the asteroid's faintness, but a few first points of the Jan. 17 session appear attenuated by ~0.15 mag, see
http://www.asu.cas.cz/~asteroid/01293_a8.png
http://www.asu.cas.cz/~asteroid/01293_a8_080117.png

More observations are needed to confirm the suspect attenuation. Fortunately, the asteroid will be passing through opposition just around February's Full Moon (at V~15.8), so we should be able to obtain good data. Long sessions are needed.

Clear Skies, Petr [2008-01-21 15:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at ~03:00 UT.
Don [2008-01-19 03:21, CarbuncleHill]

· Starting a run on this at 02:50 UT.
Don [2008-01-17 00:30, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I plan to start this at 03:40 UT, but the sky may close by then.
Don [2008-01-08 00:55, CarbuncleHill]

· I will start this one if weather hold... Best wishes, Kamil [2008-01-06 21:45, Ondrejov] Message sent to observers

· This one is dimmer than expected. Trying it on the 0.5m scope tonight.
Don [2008-01-03 04:16, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Will start a run at 04:20 UT if conditions hold.
Don [2007-12-30 03:18, CarbuncleHill]

(9583) 1990 HL1 (Finished) [Add new note]
· Julian Oey has observed this new target extensively from Leura: U = 2+ solution,
http://www.asu.cas.cz/~asteroid/09583.png
One session doesn't fit well (a trend?), but reason is unknown.
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-07-08 13:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 06/29,06/30,7/01,7/02,7/03. 2 long sessions obtained. [2016-07-07 12:47, Blue Mountains Obs] Message sent to observers

· observed on 06,22, 06/25, 06/27, 06/28 [2016-06-29 02:01, Blue Mountains Obs]

· A new target to fill up the schedule, observations done on 06/12, 06/14, 06/15, 06/16 . period found 2.638h. [2016-06-17 21:47, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2189) Zaragoza (Finished) [Add new note]
· We also observed this target from France these last two nights. It was cloudy nights but we confirm an increase in the amplitude. The data will be sent to Petr in order to complete the light curve for the 3rd apparition.
Romain and Arnaud [2016-07-07 11:22, OPERA]

· This return "prime suspect" (i.e., asteroid with P and A in or close to the range of the parameters space where binaries are frequent) has been observed in its current 3rd apparition by Amadeo Aznar and by Vladimir Benishek. They are good data, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/02189_b6.png
Unlike in the first two apparitions when its amplitude was relatively low (0.19 mag in 2009 and 0.27 mag in 2012), it has shown a much higher amplitude of 0.92 mag in this apparition. It appears that we have seen the asteroid at relatively high asterocentric latitudes in the first two apparitions. In consequence, it is not a "prime suspect" any longer.

Target closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Amadeo and Vladimir.

Petr [2016-07-07 08:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another session was obtained last night (July 04-05, 22:29-01:22 UT).

Vladimir [2016-07-05 10:56, Sopot AO] Message sent to observers

· Starting new session at 23:05 UT. [2016-07-04 23:07, IAO-Isaac Aznar Obs.]

· I have take one more session data last night. [2016-07-04 10:29, IAO-Isaac Aznar Obs.] Message sent to observers

· I obtained a session on this one (July 02-03, 22:33-01:26 UT).

Vladimir [2016-07-04 10:13, Sopot AO]

· Taking one more night for 2189 Zaragoza from 23:15 UT [2016-07-02 23:21, IAO-Isaac Aznar Obs.] Message sent to observers

· Last night I observed (2189) Zaragoza at 00:03 TU [2016-07-02 07:02, IAO-Isaac Aznar Obs.] Message sent to BinAstPhotSurvey conference

· This return "prime suspect" was observed by Peter K. from here, by Kamil, Adrian and me from La Silla (test observations with the upgraded Danish 1.54-m telescope; a fairly good data considering that they were taken 28 degrees from the Moon ~30 hours before Full), by Don Pray from Sugarloaf Mountain and by Jim from Via Capote: Good result and coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/02189_b2.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-06-19 14:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Taking second night for this one from 21:20 UT. Peter K. [2012-06-15 21:50, Ondrejov] Message sent to observers

· Doing a run on this tonight. Should get about 3 hours. [2012-06-15 04:36, Sugarloaf] Message sent to BinAstPhotSurvey conference

· David has done this one well on three nights: Unique period, good coverage, no deviation. It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Really good work, David.

Cheers, Petr [2009-11-12 18:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009-11-08, 2009-11-09 and 2009-11-10 in fair to poor conditions. Data reveals a period of 4.934 +/- 0.003hrs with an amplitude of 0.20 +/- 0.002mag [2009-11-10 22:19, HuntersHill]

(10136) Gauguin (Finished) - solution unclear [Add new note]
· Solution is unclear, it's U = 1.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2016-07-07 07:03, Ondrejov]

· Started a run at 02:00 UT.
Don [2016-05-11 02:39, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed this one from 19:30 UT to 24:10 UT, May 10
Vasilij Ch. [2016-05-11 01:25, Kharkiv] Message sent to observers

· I plan to start this new target at 02:10 UT.
Don [2016-05-09 01:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

(66391) 1999 KW4 (Finished) - NEA Binary [Add new note]
· Campaign closed. (Will be resumed next year.) Petr [2016-06-19 06:30, Ondrejov]

· Observing from 21 UT but the weather may cut my session. Peter [2016-06-17 21:50, Ondrejov] Message sent to observers

· I started this at 01:40 UT.
Don [2016-06-15 01:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Did a run on this last night,(June 11 UT),under good conditions.

Don [2016-06-11 19:49, Sugarloaf] Message sent to observers

· Started a run on this at 01:40 UT.
Don [2016-06-10 02:20, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4689) Donn (Finished) - slow rotator [Add new note]
· Vladimir Benishek took over this slow rotator from us and obtained data from Sopot on 30 nights:
http://www.asu.cas.cz/~asteroid/04689.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Cheers, Petr [2016-06-09 08:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Apr. 05-06, 18:23-01:04 UT.
Vladimir [2016-04-06 09:48, Sopot AO] Message sent to observers

· Observed on Apr. 03-04, 18:14-00:29 UT.
Vladimir [2016-04-05 15:51, Sopot AO]

· Observed on Apr. 02-03, 18:13-01:27 UT.
Vladimir [2016-04-03 11:35, Sopot AO] Message sent to observers

· observed tonight 04/02 from 12UT [2016-04-02 12:24, Blue Mountains Obs]

· observed on 03/30 and 03/31 from 12UT for 6 hours [2016-04-01 04:17, Blue Mountains Obs] Message sent to observers

· I observed this one last night (Mar. 30-31, 18:51-01:01 UT).
Vladimir [2016-03-31 10:23, Sopot AO]

· observed on 03/25 showing slight change in brightness. will continue to observe [2016-03-28 20:11, Blue Mountains Obs] Message sent to observers

· Jan Vrastil and Kamil Hornoch took an initial 2-hour run for this new target from here on 2016-03-17.8. The data show a small brightness change by a few 0.01 mag over the two hours, suggesting a longish period. We may not be able to take more data soon, so we would appreciate if someone could help us with (or possibly take over) this target. Thanks a lot for your help.

Clear Skies, Petr [2016-03-18 07:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(9074) Yosukeyoshida (Finished) - slow rotator [Add new note]
· Slow rotator, closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-06-06 08:33, Ondrejov]

· Plan to start this new target at 02:10 UT.
Don [2016-05-12 01:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3518) Florena (Finished) [Add new note]
· This new target has been done by Vladimir Benishek from Sopot and by Don Pray from Sugarloaf Mountain: Good solution and coverage, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/03518.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Vladimir and Don.

Cheers, Petr [2016-05-30 10:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· This new target was observed on 3 nights: May 26-27 (20:19-01:25 UT), May 27-28 (20:08-01:26 UT) and May 29-30 (22:20-01:27 UT).
Vladimir [2016-05-30 10:01, Sopot AO]

(4520) Dovzhenko (Finished) [Add new note]
· This one is closed for the Survey: Unique period, but double coverage was not completed:
http://www.asu.cas.cz/~asteroid/04520.png
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2016-05-19 06:38, Ondrejov]

· New object from November target list. Observed from DSO for 3 hours JD 57360 (12/03-04/15). Period ~4 hours with amplitude of ~0.9. Observing tonight 12/05-06/15 (JD 57362) since 0200 UT from DSO. Hope to get ~6.5 hours. Joe [2015-12-06 05:24, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(4555) 1987 QL (Finished) [Add new note]
· Closed (some deviations seen, but not understood).
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-05-17 07:13, Ondrejov]

· more observations done from 10:57 to 13:06UT 10/19 [2014-10-20 02:10, Blue Mountains Obs] Message sent to observers

· observed 08/31 from 08:40 UT for about 8 hours. Condition is good [2014-09-01 07:15, Blue Mountains Obs]

· observed on 08/04,08/05, and 08/7 for an average 7 hours per session. [2014-08-09 05:40, Blue Mountains Obs] Message sent to observers

· Observed this target in night 06/07 Aug from 19.5 UT to 24.2 UT. Vasilij Ch. [2014-08-08 17:26, Kharkiv]

· observed last night from 10:30UT 08/04 to 19:50UT. [2014-08-05 02:30, Blue Mountains Obs] Message sent to observers

· Start this new target tonight from 11UT. [2014-07-26 13:57, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This one has been done by Peter and Kamil from Ondrejov (9 calibrated nights), by David from Hunters Hill (2 nights), by Vasilij from Kharkiv (2 nights), and by Don from Carbuncle Hill (1 night). Unique period of 2.8847 h, good coverage, and no obvious event seen, but variations in mean levels of the calibrated Ondrejov R data suggest that there may be a rotation of an unresolved satellite. Observations in a different geometry on a future apparition will be needed.
http://www.asu.cas.cz/~asteroid/04555_07may.png
http://www.asu.cas.cz/~asteroid/04555_07jun.png
It is done for now, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-06-20 11:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hello all, I will try to observe this one tonight plus 95711 as complementary target. Best wishes, Kamil [2007-06-12 18:09, Ondrejov]

· Hello all, I will try to observe this one tonight if weather permit. Some cirrus are visible now... Best wishes, Kamil [2007-06-11 20:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21:10 UT, the sky should be good. Peter K. [2007-06-08 21:45, Ondrejov]

· Observed from 2007.05.23 11:25UT to 19:02UT in generally poor conditions. Data refined my plot to 2.8845 +/0 0.0002hr with an amplitude of 0.24 +/- 0.03mag. Data sent to Petr. [2007-05-23 22:13, HuntersHill] Message sent to BinAstPhotSurvey conference

· Hello all, I will be observing (4555) from 23:20 UT up to 01:20 UT. Best wishes, Kamil [2007-05-23 17:26, Ondrejov]

· I'll pick this up at ~3:15 UT to help finish it.
Don [2007-05-22 01:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 21:50 UT. Peter K. [2007-05-21 23:30, Ondrejov]

· One night by David from Hunters Hill and two short linked nights by Kamil and Peter from here give a unique solution of 2.8838 h:
http://www.asu.cas.cz/~asteroid/04555.png
At least one more full night is needed to finish this one.

Cheers, Petr [2007-05-21 12:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hello all, I will be observing this one from 21:30 UT up to 01:15 UT. Weather is OK. Best wishes, Kamil, Ondrejov [2007-05-20 18:45, Ondrejov]

· Observed 20070516 10:54UT to 15:45UT in average conditions cut short by cloud. Data reveals a fast rotator at 2.89 +/- 0.02 hrs with an amplitude of 0.2 +/- 0.02 mag. No deviations noted. [2007-05-17 09:50, HuntersHill] Message sent to BinAstPhotSurvey conference

(20325) 1998 HO27 (Finished) - return binary [Add new note]
· Done for the 2nd apparition. Petr [2016-05-17 06:42, Ondrejov]

· observed 05/13 capturing the end of phase 0.75 and most of outside events through the night. [2016-05-16 13:28, Blue Mountains Obs] Message sent to observers

· observed 05/13 capturing the end of phase 0.75 and most of outside events through the night. [2016-05-15 08:46, Blue Mountains Obs]

· observing tonight from 10.5 UT [2016-05-05 10:25, Blue Mountains Obs] Message sent to observers

· observed 04/05 for phase 0.75 event [2016-05-05 02:11, Blue Mountains Obs]

· Current status for this return binary:
http://www.asu.cas.cz/~asteroid/20325_2016_porb.png
http://www.asu.cas.cz/~asteroid/20325_2016_p1.png
(The suspect drops before the ends of the Julian's sessions correlates with increased errors and we consider they are spurious; in any case, it needs to be confirmed.)

More data (errors < 0.03 mag; don't bother in suboptimal conditions) are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 4-23 7.80 0.257
2016- 4-24 7.33 0.257
2016- 4-25 6.87 0.257
2016- 4-26 6.40 0.257
2016- 4-27 5.93 0.257
2016- 4-28 5.46 0.257
2016- 4-29 4.99 0.257
2016- 4-30 4.53 0.257
2016- 5- 1 4.06 0.257
2016- 5- 2 3.59 0.257
2016- 5- 3 3.12 0.257
2016- 5- 4 2.65 0.257
2016- 5- 5 2.19 0.257
2016- 5- 6 1.72 0.257
2016- 5- 7 1.25 0.257
2016- 5- 8 0.78 0.257
2016- 5- 9 0.31 0.257
2016- 5- 9 23.85 0.257
2016- 5-10 23.38 0.257
2016- 5-11 22.91 0.257
2016- 5-12 22.44 0.257
2016- 5-13 21.97 0.257
2016- 5-14 21.51 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2016- 4-23 19.56 0.757
2016- 4-24 19.09 0.757
2016- 4-25 18.62 0.757
2016- 4-26 18.15 0.757
2016- 4-27 17.68 0.757
2016- 4-28 17.22 0.757
2016- 4-29 16.75 0.757
2016- 4-30 16.28 0.757
2016- 5- 1 15.81 0.757
2016- 5- 2 15.34 0.757
2016- 5- 3 14.88 0.757
2016- 5- 4 14.41 0.757
2016- 5- 5 13.94 0.757
2016- 5- 6 13.47 0.757
2016- 5- 7 13.00 0.757
2016- 5- 8 12.54 0.757
2016- 5- 9 12.07 0.757
2016- 5-10 11.60 0.757
2016- 5-11 11.13 0.757
2016- 5-12 10.66 0.757
2016- 5-13 10.20 0.757
2016- 5-14 9.73 0.757

Clear Skies, Petr [2016-04-20 11:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 04/10 and 04/15. 0.25 phase captured [2016-04-16 04:45, Blue Mountains Obs] Message sent to observers

· observed last night 04/08 and captured full 0.25 phase event. [2016-04-09 09:03, Blue Mountains Obs]

· Jan Vrastil and Kamil Hornoch took first data for this return binary in its current 2nd apparition:
http://www.asu.cas.cz/~asteroid/20325_2016_porb.png
http://www.asu.cas.cz/~asteroid/20325_2016_p1.png

More data (errors < 0.03 mag) for both events are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 3-19 0.51 0.251
2016- 3-20 0.04 0.251
2016- 3-26 20.77 0.251
2016- 3-27 20.30 0.251
2016- 3-28 19.83 0.251
2016- 3-29 19.36 0.251
2016- 3-30 18.90 0.251
2016- 3-31 18.43 0.251
2016- 4- 1 17.96 0.251
2016- 4- 2 17.49 0.251
2016- 4- 3 17.02 0.251
2016- 4- 4 16.56 0.251
2016- 4- 5 16.09 0.251
2016- 4- 6 15.62 0.251
2016- 4- 7 15.15 0.251
2016- 4- 8 14.68 0.251
2016- 4- 9 14.22 0.251
2016- 4-10 13.75 0.251
2016- 4-11 13.28 0.251
2016- 4-12 12.81 0.251
2016- 4-13 12.34 0.251
2016- 4-14 11.88 0.251
2016- 4-15 11.41 0.251
2016- 4-16 10.94 0.251
2016- 4-17 10.47 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2016- 3-18 12.73 0.751
2016- 3-19 12.27 0.751
2016- 3-20 11.80 0.751
2016- 3-27 8.52 0.751
2016- 3-28 8.05 0.751
2016- 3-29 7.59 0.751
2016- 3-30 7.12 0.751
2016- 3-31 6.65 0.751
2016- 4- 1 6.18 0.751
2016- 4- 2 5.71 0.751
2016- 4- 3 5.25 0.751
2016- 4- 4 4.78 0.751
2016- 4- 5 4.31 0.751
2016- 4- 6 3.84 0.751
2016- 4- 7 3.37 0.751
2016- 4- 8 2.91 0.751
2016- 4- 9 2.44 0.751
2016- 4-10 1.97 0.751
2016- 4-11 1.50 0.751
2016- 4-12 1.03 0.751
2016- 4-13 0.57 0.751
2016- 4-14 0.10 0.751
2016- 4-14 23.63 0.751
2016- 4-15 23.16 0.751
2016- 4-16 22.69 0.751

Clear Skies, Petr [2016-03-18 07:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Closing this one for the discovery apparition.
http://www.asu.cas.cz/~asteroid/20325_porb.png
http://www.asu.cas.cz/~asteroid/20325_p1.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-03-04 09:13, Ondrejov]

· Started a run on this at 00:30 UT, and will hopefully catch the 0.750 phase event.
Don [2015-01-23 00:36, Sugarloaf] Message sent to observers

· Started a run on this at 23:30, Jan 20 UT, and hope to catch the 0.750 phase event.
Don [2015-01-20 23:26, Sugarloaf]

· Began run from Prompt Tololo at 0050 UT. Hope to get most of the secondary event at 0416 UT. Joe [2015-01-18 01:01, Dark Sky & PROMPT] Message sent to observers

· Current status:
http://www.asu.cas.cz/~asteroid/20325_porb.png
http://www.asu.cas.cz/~asteroid/20325_p1.png

More data would be still useful to refine the orbital period. Errors not greater than 0.03 mag are needed; don't bother in less ideal conditions. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1- 8 20.72 0.251
2015- 1- 9 20.25 0.251
2015- 1-10 19.79 0.251
2015- 1-11 19.32 0.251
2015- 1-12 18.86 0.251
2015- 1-13 18.39 0.251
2015- 1-14 17.93 0.251
2015- 1-15 17.46 0.251
2015- 1-16 17.00 0.251
2015- 1-17 16.53 0.251
2015- 1-18 16.07 0.251
2015- 1-19 15.60 0.251
2015- 1-20 15.14 0.251
2015- 1-21 14.67 0.251
2015- 1-22 14.21 0.251
2015- 1-23 13.74 0.251
2015- 1-24 13.28 0.251
2015- 1-25 12.81 0.251
2015- 1-26 12.35 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1- 8 8.92 0.750
2015- 1- 9 8.45 0.750
2015- 1-10 7.99 0.750
2015- 1-11 7.52 0.750
2015- 1-12 7.06 0.750
2015- 1-13 6.59 0.750
2015- 1-14 6.13 0.750
2015- 1-15 5.66 0.750
2015- 1-16 5.20 0.750
2015- 1-17 4.73 0.750
2015- 1-18 4.27 0.750
2015- 1-19 3.80 0.750
2015- 1-20 3.34 0.750
2015- 1-21 2.87 0.750
2015- 1-22 2.41 0.750
2015- 1-23 1.94 0.750
2015- 1-24 1.48 0.750
2015- 1-25 1.01 0.750
2015- 1-26 0.55 0.750
2015- 1-27 0.08 0.750

Clear Skies, Petr [2015-01-07 11:21, Ondrejov]

· Our discovery announcement on (20325) has been published on CBET 4039.

Happy Holidays!

Petr

(20325) 1998 HO_27
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; V. Benishek, Belgrade Observatory; J.
Pollock, Appalachian State University; W. Cooney and J. Gross, Sonoita
Research Observatory; D. Terrell, Southwest Research Institute; D. E.
Reichart, J. B. Haislip and A. P. LaCluyze, University of North Carolina,
Chapel Hill; and A. Verveer and T. Spuck, Perth Observatory, report that
photometric observations obtained during 2014 Nov. 22-Dec. 20 reveal that
minor planet (20325) is a binary system with an orbital period of 23.54 ±
0.01 hr. The primary shows a period of 3.24474 ± 0.00008 hr, and it has a
lightcurve amplitude of 0.13 mag, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.09- to 0.19-magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.30 ± 0.02.

2014 December 24 (CBET 4039) Daniel W. E. Green [2014-12-24 08:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one last night (Dec. 19, 17:29 - 22:06 UT).
Vladimir [2014-12-20 16:13, Sopot AO] Message sent to observers

· I plan to start a run on this at 3:30 UT and hope to catch the primary event at 5.99 UT.
Don [2014-12-20 01:18, Sugarloaf]

· The weather has finally broken for us at SRO. Should be starting a run on this one in a bit and should be able to get a nice look at the 0.25 phase event. -Walt [2014-12-19 01:28, Sonoita] Message sent to observers

· Began observations from Prompt Tololo at 0110 UT. Hope to be able to get first part of the 0.250 event centered at 0751 UT. Joe [2014-12-16 03:57, Dark Sky & PROMPT]

· Vladimir Benishek has observed the 0.75-phase event on the past two nights. The orbital period is refined --- it's slightly shorter than was the previous solution, so the mutual events occur more than one hour sooner now than was the ephemeris I gave on December 3; an updated ephemeris is below.
http://www.asu.cas.cz/~asteroid/20325_porb.png

We need to obtain a good data for the 0.25-phase event for doing a discovery CBET.

Date/Time UTC (LTc.) Phase
--------------------------
2014-12-16 7.85 0.250
2014-12-17 7.39 0.250
2014-12-18 6.92 0.250
2014-12-19 6.46 0.250
2014-12-20 5.99 0.250
2014-12-21 5.53 0.250
2014-12-22 5.06 0.250
2014-12-23 4.60 0.250
2014-12-24 4.13 0.250
2014-12-25 3.67 0.250
2014-12-26 3.20 0.250
2014-12-27 2.74 0.250
2014-12-28 2.27 0.250
2014-12-29 1.81 0.250
2014-12-30 1.34 0.250
2014-12-31 0.88 0.250
2015- 1- 1 0.41 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014-12-15 20.08 0.750
2014-12-16 19.61 0.750
2014-12-17 19.15 0.750
2014-12-18 18.68 0.750
2014-12-19 18.22 0.750
2014-12-20 17.75 0.750
2014-12-21 17.29 0.750
2014-12-22 16.82 0.750
2014-12-23 16.36 0.750
2014-12-24 15.89 0.750
2014-12-25 15.43 0.750
2014-12-26 14.96 0.750
2014-12-27 14.50 0.750
2014-12-28 14.03 0.750
2014-12-29 13.57 0.750
2014-12-30 13.10 0.750
2014-12-31 12.64 0.750
2015- 1- 1 12.17 0.750

Clear Skies, Petr [2014-12-15 15:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on December 13/14 (18:26 - 01:04 UT) at Sopot AO.
Vladimir [2014-12-14 15:10, Sopot AO] Message sent to observers

· Attempts to cover the 0.25-phase event have been unsuccessfull on the past few nights. We will need to cover it after the full moon; we'll do a discovery CBET then.
http://www.asu.cas.cz/~asteroid/20325_porb.png
http://www.asu.cas.cz/~asteroid/20325_p1.png

Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-12-10 11.51 0.250
2014-12-11 11.11 0.250
2014-12-12 10.71 0.250
2014-12-13 10.31 0.250
2014-12-14 9.91 0.250
2014-12-15 9.51 0.250
2014-12-16 9.11 0.250
2014-12-17 8.71 0.250
2014-12-18 8.31 0.250
2014-12-19 7.91 0.250
2014-12-20 7.51 0.250
2014-12-21 7.11 0.250
2014-12-22 6.71 0.250
2014-12-23 6.31 0.250
2014-12-24 5.91 0.250
2014-12-25 5.51 0.250
2014-12-26 5.11 0.250
2014-12-27 4.71 0.250
2014-12-28 4.31 0.250
2014-12-29 3.91 0.250
2014-12-30 3.51 0.250
2014-12-31 3.11 0.250
2015- 1- 1 2.71 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014-12- 9 23.69 0.750
2014-12-10 23.29 0.750
2014-12-11 22.89 0.750
2014-12-12 22.49 0.750
2014-12-13 22.09 0.750
2014-12-14 21.69 0.750
2014-12-15 21.29 0.750
2014-12-16 20.89 0.750
2014-12-17 20.49 0.750
2014-12-18 20.09 0.750
2014-12-19 19.69 0.750
2014-12-20 19.29 0.750
2014-12-21 18.89 0.750
2014-12-22 18.49 0.750
2014-12-23 18.09 0.750
2014-12-24 17.69 0.750
2014-12-25 17.29 0.750
2014-12-26 16.89 0.750
2014-12-27 16.49 0.750
2014-12-28 16.09 0.750
2014-12-29 15.69 0.750
2014-12-30 15.29 0.750
2014-12-31 14.89 0.750
2015- 1- 1 14.49 0.750

Clear Skies, Petr [2014-12-03 10:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work from SRO tonight. -Walt [2014-11-30 23:03, Sonoita] Message sent to observers

· More observations by Don Pray from Sugarloaf Mountain, by Joe Pollock with the Prompt and Perth telescopes, and by Vladimir Benishek from Sopot have been joined in. (There have been taken also a few other runs with lower quality, which we may join in later on.) The orbital period is nailed down: 23.6 h (error < 0.1 h).
http://www.asu.cas.cz/~asteroid/20325_porb.png
http://www.asu.cas.cz/~asteroid/20325_p1.png

More data for the 0.25-phase event in particular would be good; we'll do a CBET then. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-12- 1 15.11 0.250
2014-12- 2 14.71 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014-12- 1 3.29 0.750
2014-12- 2 2.89 0.750
2014-12- 3 2.49 0.750

Clear Skies, Petr [2014-11-30 15:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Correction to last post...starting 01:10, Nov 29.
Don [2014-11-28 22:12, Sugarloaf] Message sent to observers

· I'll be starting a run at 01:10, Nov 30 UT, and should get about 8.25 hours.
Don [2014-11-28 22:09, Sugarloaf]

· Began run from Prompt Tololo at 0140 UT. Hope to get about 7 hours. Joe [2014-11-27 02:53, Dark Sky & PROMPT] Message sent to observers

· Started this target at 20:18 UT.
Vladimir [2014-11-26 20:39, Sopot AO]

· Began run from Prompt Tololo at 0140 UT. Hope to get about 7 hours. Joe [2014-11-26 02:19, Dark Sky & PROMPT] Message sent to observers

· Don Pray has found this new target to be a binary suspect. A very tentative solution (none of the two components is solved uniquely):
http://www.asu.cas.cz/~asteroid/20325_porb.png
http://www.asu.cas.cz/~asteroid/20325_p1.png

Don may not be able to obtain more data soon, a help by others is needed.

Clear Skies, Petr [2014-11-25 15:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this new target at 01:45 UT.
Don [2014-11-22 00:41, Sugarloaf]

(3868) Mendoza (Finished) - return binary [Add new note]
· Done for the 4th apparition:
http://www.asu.cas.cz/~asteroid/03868_2016a_porb.png
http://www.asu.cas.cz/~asteroid/03868_2016a_p1.png
http://www.asu.cas.cz/~asteroid/03868_2016b_porb.png
http://www.asu.cas.cz/~asteroid/03868_2016b_p1.png
We are going to attempt to get its orbital pole for our prepared paper. Petr [2016-05-16 10:19, Ondrejov]

· Started a run at 01:50 and hope to catch the 0.248 phase event at 2:43 UT.
Don [2016-05-12 02:00, Sugarloaf] Message sent to observers

· Started this at 01:30 UT and hope to catch the 1.95 UT event. Last night's attempt was ruined by clouds.
Don [2016-05-10 01:44, Sugarloaf]

· I started a run on this at 01:00 UT and should catch most of the 0.248 phase event.
Don [2016-05-09 01:07, Sugarloaf] Message sent to observers

· Current data for this return binary:
http://www.asu.cas.cz/~asteroid/03868_2016a_porb.png
http://www.asu.cas.cz/~asteroid/03868_2016a_p1.png

More data (errors <= 0.02 mag; don't bother in less ideal conditions) are needed to get a unique orbital solution; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 4-24 8.06 0.248
2016- 4-24 20.25 0.248
2016- 4-25 8.44 0.248
2016- 4-25 20.63 0.248
2016- 4-26 8.82 0.248
2016- 4-26 21.01 0.248
2016- 4-27 9.20 0.248
2016- 4-27 21.39 0.248
2016- 4-28 9.58 0.248
2016- 4-28 21.77 0.248
2016- 4-29 9.96 0.248
2016- 4-29 22.15 0.248
2016- 4-30 10.34 0.248
2016- 4-30 22.53 0.248
2016- 5- 1 10.72 0.248
2016- 5- 1 22.91 0.248
2016- 5- 2 11.10 0.248
2016- 5- 2 23.29 0.248
2016- 5- 3 11.48 0.248
2016- 5- 3 23.67 0.248
2016- 5- 4 11.86 0.248
2016- 5- 5 0.05 0.248
2016- 5- 5 12.24 0.248
2016- 5- 6 0.43 0.248
2016- 5- 6 12.62 0.248
2016- 5- 7 0.81 0.248
2016- 5- 7 13.00 0.248
2016- 5- 8 1.19 0.248
2016- 5- 8 13.38 0.248
2016- 5- 9 1.57 0.248
2016- 5- 9 13.76 0.248
2016- 5-10 1.95 0.248
2016- 5-10 14.14 0.248
2016- 5-11 2.33 0.248
2016- 5-11 14.52 0.248
2016- 5-12 2.71 0.248
2016- 5-12 14.90 0.248
2016- 5-13 3.09 0.248
2016- 5-13 15.28 0.248
2016- 5-14 3.47 0.248
2016- 5-14 15.66 0.248
2016- 5-15 3.85 0.248
2016- 5-15 16.04 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2016- 4-24 2.07 0.758
2016- 4-24 14.26 0.758
2016- 4-25 2.45 0.758
2016- 4-25 14.64 0.758
2016- 4-26 2.83 0.758
2016- 4-26 15.02 0.758
2016- 4-27 3.21 0.758
2016- 4-27 15.40 0.758
2016- 4-28 3.59 0.758
2016- 4-28 15.78 0.758
2016- 4-29 3.97 0.758
2016- 4-29 16.16 0.758
2016- 4-30 4.35 0.758
2016- 4-30 16.54 0.758
2016- 5- 1 4.73 0.758
2016- 5- 1 16.92 0.758
2016- 5- 2 5.11 0.758
2016- 5- 2 17.30 0.758
2016- 5- 3 5.49 0.758
2016- 5- 3 17.68 0.758
2016- 5- 4 5.87 0.758
2016- 5- 4 18.06 0.758
2016- 5- 5 6.25 0.758
2016- 5- 5 18.44 0.758
2016- 5- 6 6.63 0.758
2016- 5- 6 18.82 0.758
2016- 5- 7 7.01 0.758
2016- 5- 7 19.20 0.758
2016- 5- 8 7.39 0.758
2016- 5- 8 19.58 0.758
2016- 5- 9 7.77 0.758
2016- 5- 9 19.96 0.758
2016- 5-10 8.15 0.758
2016- 5-10 20.34 0.758
2016- 5-11 8.53 0.758
2016- 5-11 20.72 0.758
2016- 5-12 8.91 0.758
2016- 5-12 21.10 0.758
2016- 5-13 9.29 0.758
2016- 5-13 21.48 0.758
2016- 5-14 9.67 0.758
2016- 5-14 21.86 0.758
2016- 5-15 10.05 0.758

Clear Skies, Petr [2016-04-20 10:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 03:15 UT to catch the 0.250 phase event at 07:36 UT.
Don [2016-04-06 01:13, Sugarloaf] Message sent to observers

· Kamil Hornoch, Hana Kucakova and Jan Vrastil took first two nights for this return binary in its current apparition:
http://www.asu.cas.cz/~asteroid/03868_2016a_porb.png
http://www.asu.cas.cz/~asteroid/03868_2016a_p1.png

Data for the 0.25-phase event in particular would be useful (errors <= 0.02 mag needed; don't bother in less ideal conditions); event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 4- 5 6.98 0.250
2016- 4- 5 19.17 0.250
2016- 4- 6 7.36 0.250
2016- 4- 6 19.55 0.250
2016- 4- 7 7.74 0.250
2016- 4- 7 19.93 0.250
2016- 4- 8 8.12 0.250
2016- 4- 8 20.31 0.250
2016- 4- 9 8.50 0.250
2016- 4- 9 20.69 0.250
2016- 4-10 8.88 0.250
2016- 4-10 21.07 0.250
2016- 4-11 9.26 0.250
2016- 4-11 21.45 0.250
2016- 4-12 9.64 0.250
2016- 4-12 21.83 0.250
2016- 4-13 10.02 0.250
2016- 4-13 22.21 0.250
2016- 4-14 10.40 0.250
2016- 4-14 22.59 0.250
2016- 4-15 10.78 0.250
2016- 4-15 22.97 0.250
2016- 4-16 11.16 0.250
2016- 4-16 23.35 0.250
2016- 4-17 11.54 0.250
2016- 4-17 23.73 0.250
2016- 4-18 11.92 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2016- 4- 5 13.07 0.750
2016- 4- 6 1.26 0.750
2016- 4- 6 13.45 0.750
2016- 4- 7 1.64 0.750
2016- 4- 7 13.83 0.750
2016- 4- 8 2.02 0.750
2016- 4- 8 14.21 0.750
2016- 4- 9 2.40 0.750
2016- 4- 9 14.59 0.750
2016- 4-10 2.78 0.750
2016- 4-10 14.97 0.750
2016- 4-11 3.16 0.750
2016- 4-11 15.35 0.750
2016- 4-12 3.54 0.750
2016- 4-12 15.73 0.750
2016- 4-13 3.92 0.750
2016- 4-13 16.11 0.750
2016- 4-14 4.30 0.750
2016- 4-14 16.49 0.750
2016- 4-15 4.68 0.750
2016- 4-15 16.87 0.750
2016- 4-16 5.06 0.750
2016- 4-16 17.25 0.750
2016- 4-17 5.44 0.750
2016- 4-17 17.63 0.750
2016- 4-18 5.82 0.750
2016- 4-18 18.01 0.750

Petr [2016-04-05 05:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· More data covering the orbital period plus a revision of one previous session: No prominent attenuation seen in this 3rd apparition, in contrast with the previous two apparitions which both had events (see our paper Pravec et al., Icarus 218 (2012) 125-143).
http://www.asu.cas.cz/~asteroid/03868_12_porb.png
http://www.asu.cas.cz/~asteroid/03868_12_p1.png
This appears to be one of those exceptional binaries with obliquities not quite close to 0 or 180 deg. If someone can take high-quality data (long sessions with errors of 0.01 mag), it would be still useful to strengthen the events non-detection (or possibly revealing shallow partial events if they are such hiding in the noise now).

Clear Skies, Petr [2012-03-08 12:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 19:15 UT. Best wishes, Kamil [2012-03-04 19:32, Ondrejov] Message sent to observers

· Observing this one from 23:15 UT in unpredictable conditions. Best wishes, Honza and Kamil [2012-03-02 23:28, Ondrejov]

· First event in this 3rd apparition for this binary at last! Jim Brinsfield has taken a short session on the past night, covering orbit phases that have not been covered before, and he apparently captured the primary event:
http://www.asu.cas.cz/~asteroid/03868_12_porb.png
http://www.asu.cas.cz/~asteroid/03868_12_p1.png

Covering it one or two more times is needed; its ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-29 17.31 0.248
2012- 3- 1 5.50 0.248
2012- 3- 1 17.69 0.248
2012- 3- 2 5.88 0.248
2012- 3- 2 18.07 0.248
2012- 3- 3 6.26 0.248
2012- 3- 3 18.45 0.248
2012- 3- 4 6.64 0.248
2012- 3- 4 18.83 0.248
2012- 3- 5 7.02 0.248

A very shallow secondary event seems to be buried in the noise (nearly as it was in the first apparition), but a very high quality data might hopefully resolve it, so I provide its ephemeris as well:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2-29 23.40 0.748
2012- 3- 1 11.59 0.748
2012- 3- 1 23.78 0.748
2012- 3- 2 11.97 0.748
2012- 3- 3 0.16 0.748
2012- 3- 3 12.35 0.748
2012- 3- 4 0.54 0.748
2012- 3- 4 12.73 0.748
2012- 3- 5 0.92 0.748

Clear Skies, Petr [2012-02-29 14:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to observe from Prompt from 0100-0830 UT. Current conditions look very good. Joe [2012-02-27 00:09, Dark Sky & PROMPT] Message sent to observers

· planning to observe from 08:00UT [2012-02-23 04:01, Via Capote]

· Observing from ~20:30UT. Jozef, Leos. [2012-02-22 21:11, Modra]

· planning to start this target at 07:15UT [2012-02-20 00:20, Via Capote] Message sent to BinAstPhotSurvey conference

· Closed for this apparition. Petr [2010-11-18 10:42, Ondrejov]

· I will try to catch 0.262-phase event tonight. Observed also 3 hours last night (out of events). Best wishes, Kamil [2010-11-14 15:37, Ondrejov] Message sent to observers

· Observed this object today from 18:00UT Gabo [2010-10-29 14:58, SkalnatePleso] [Remove]

· My object today evening from cca 17:45 UT. Gabo [2010-10-27 15:54, SkalnatePleso] [Remove]
Message sent to observers

· Great data taken for this return binary with small satellite from here, Skalnate Pleso, Kharkiv and Modra. Current solution:
http://www.asu.cas.cz/~asteroid/03868_10a_porb.png
http://www.asu.cas.cz/~asteroid/03868_10a_p1.png
http://www.asu.cas.cz/~asteroid/03868_10b_porb.png
http://www.asu.cas.cz/~asteroid/03868_10b_p1.png

The asteroid will be still bright enough for some of us in the next lunation. Further monitoring (long sessions, errors not greater than 0.01 mag) would be useful for future modeling. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010-10-26 10.85 0.262
2010-10-26 23.04 0.262
2010-10-27 11.23 0.262
2010-10-27 23.42 0.262
2010-10-28 11.61 0.262
2010-10-28 23.80 0.262
2010-10-29 11.99 0.262
2010-10-30 0.18 0.262
2010-10-30 12.37 0.262
2010-10-31 0.56 0.262
2010-10-31 12.75 0.262
2010-11- 1 0.94 0.262
2010-11- 1 13.13 0.262
2010-11- 2 1.32 0.262
2010-11- 2 13.51 0.262
2010-11- 3 1.70 0.262
2010-11- 3 13.89 0.262
2010-11- 4 2.08 0.262
2010-11- 4 14.27 0.262
2010-11- 5 2.46 0.262
2010-11- 5 14.65 0.262
2010-11- 6 2.84 0.262
2010-11- 6 15.03 0.262
2010-11- 7 3.22 0.262
2010-11- 7 15.41 0.262
2010-11- 8 3.60 0.262
2010-11- 8 15.79 0.262
2010-11- 9 3.98 0.262
2010-11- 9 16.17 0.262
2010-11-10 4.36 0.262
2010-11-10 16.55 0.262
2010-11-11 4.74 0.262
2010-11-11 16.93 0.262
2010-11-12 5.12 0.262
2010-11-12 17.31 0.262
2010-11-13 5.50 0.262
2010-11-13 17.69 0.262
2010-11-14 5.88 0.262
2010-11-14 18.07 0.262
2010-11-15 6.26 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2010-10-26 4.88 0.772
2010-10-26 17.07 0.772
2010-10-27 5.26 0.772
2010-10-27 17.45 0.772
2010-10-28 5.64 0.772
2010-10-28 17.83 0.772
2010-10-29 6.02 0.772
2010-10-29 18.21 0.772
2010-10-30 6.40 0.772
2010-10-30 18.59 0.772
2010-10-31 6.78 0.772
2010-10-31 18.97 0.772
2010-11- 1 7.16 0.772
2010-11- 1 19.35 0.772
2010-11- 2 7.54 0.772
2010-11- 2 19.73 0.772
2010-11- 3 7.92 0.772
2010-11- 3 20.11 0.772
2010-11- 4 8.30 0.772
2010-11- 4 20.49 0.772
2010-11- 5 8.68 0.772
2010-11- 5 20.87 0.772
2010-11- 6 9.06 0.772
2010-11- 6 21.25 0.772
2010-11- 7 9.44 0.772
2010-11- 7 21.63 0.772
2010-11- 8 9.82 0.772
2010-11- 8 22.01 0.772
2010-11- 9 10.20 0.772
2010-11- 9 22.39 0.772
2010-11-10 10.58 0.772
2010-11-10 22.77 0.772
2010-11-11 10.96 0.772
2010-11-11 23.15 0.772
2010-11-12 11.34 0.772
2010-11-12 23.53 0.772
2010-11-13 11.72 0.772
2010-11-13 23.91 0.772
2010-11-14 12.10 0.772
2010-11-15 0.29 0.772

Clear Skies, Petr [2010-10-19 14:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· I should cover 0.750 event tonight under excellent skies conditions. Best wishes, Kamil [2010-10-10 18:27, Ondrejov] Message sent to observers

· I will try to cover 0.750 event tonight. Best wishes, Kamil [2010-10-09 15:34, Ondrejov]

· Observing this one from 19:50 UT trying to cover 0.750 event. Best wishes, Kamil [2010-10-08 20:44, Ondrejov] Message sent to observers

· Began observing from Prompt at 0049 UT. Have covered 0.250 event at 0210 and hope to get 0.750 event at 0814 with observations ending at 0910 UT. Joe [2010-10-06 04:14, Dark Sky & PROMPT]

· Observing from 21:30 UT and should cover 0.25-phase event. Peter K. [2010-10-01 23:23, Ondrejov] Message sent to observers

· This return binary was observed by Peter and Kamil from here and by Gabo, Michal and Marek from S. Pleso on four nights Sept 7-21. Somewhat surprisingly, their high-quality data showed a mutual event every ~6 hours, giving P_orb = 12.17 h. This is half of the P_orb estimate of 24.38 h we got in 2009 (CBET 1835).
http://www.asu.cas.cz/~asteroid/03868_10_porb.png
http://www.asu.cas.cz/~asteroid/03868_10_p1.png
A revisit of the 2009 data shows that the secondary event was much shallower than the primary event then and it was "lost in noise", we overlooked it in the noisier data (the rms error was 0.019 mag in the 2009 data, cf. with 0.009 mag of the current data) and got stuck with the twice as high value for the orbit period.
http://www.asu.cas.cz/~asteroid/03868_09_porb.png
http://www.asu.cas.cz/~asteroid/03868_09_p1.png
In addition to P_orb, the size ratio needs to be revised as well, the current data indicate D_2/D_1 about 0.18, but this needs to be nailed down with more data.

Monitoring evolution of the events will be useful, taking two sessions for each of the two events per lunation, with errors not greater than 0.01 mag, should be sufficient. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 9-27 23.44 0.250
2010- 9-28 11.61 0.250
2010- 9-28 23.78 0.250
2010- 9-29 11.95 0.250
2010- 9-30 0.12 0.250
2010- 9-30 12.29 0.250
2010-10- 1 0.46 0.250
2010-10- 1 12.63 0.250
2010-10- 2 0.80 0.250
2010-10- 2 12.97 0.250
2010-10- 3 1.14 0.250
2010-10- 3 13.31 0.250
2010-10- 4 1.48 0.250
2010-10- 4 13.65 0.250
2010-10- 5 1.82 0.250
2010-10- 5 13.99 0.250
2010-10- 6 2.16 0.250
2010-10- 6 14.33 0.250
2010-10- 7 2.50 0.250
2010-10- 7 14.67 0.250
2010-10- 8 2.84 0.250
2010-10- 8 15.01 0.250
2010-10- 9 3.18 0.250
2010-10- 9 15.35 0.250
2010-10-10 3.52 0.250
2010-10-10 15.69 0.250
2010-10-11 3.86 0.250
2010-10-11 16.03 0.250
2010-10-12 4.20 0.250
2010-10-12 16.37 0.250
2010-10-13 4.54 0.250
2010-10-13 16.71 0.250
2010-10-14 4.88 0.250
2010-10-14 17.05 0.250
2010-10-15 5.22 0.250
2010-10-15 17.39 0.250
2010-10-16 5.56 0.250
2010-10-16 17.73 0.250
2010-10-17 5.90 0.250
2010-10-17 18.07 0.250
2010-10-18 6.24 0.250
2010-10-18 18.41 0.250
2010-10-19 6.58 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 9-28 5.52 0.750
2010- 9-28 17.69 0.750
2010- 9-29 5.86 0.750
2010- 9-29 18.03 0.750
2010- 9-30 6.20 0.750
2010- 9-30 18.37 0.750
2010-10- 1 6.54 0.750
2010-10- 1 18.71 0.750
2010-10- 2 6.88 0.750
2010-10- 2 19.05 0.750
2010-10- 3 7.22 0.750
2010-10- 3 19.39 0.750
2010-10- 4 7.56 0.750
2010-10- 4 19.73 0.750
2010-10- 5 7.90 0.750
2010-10- 5 20.07 0.750
2010-10- 6 8.24 0.750
2010-10- 6 20.41 0.750
2010-10- 7 8.58 0.750
2010-10- 7 20.75 0.750
2010-10- 8 8.92 0.750
2010-10- 8 21.09 0.750
2010-10- 9 9.26 0.750
2010-10- 9 21.43 0.750
2010-10-10 9.60 0.750
2010-10-10 21.77 0.750
2010-10-11 9.94 0.750
2010-10-11 22.11 0.750
2010-10-12 10.28 0.750
2010-10-12 22.45 0.750
2010-10-13 10.62 0.750
2010-10-13 22.79 0.750
2010-10-14 10.96 0.750
2010-10-14 23.13 0.750
2010-10-15 11.30 0.750
2010-10-15 23.47 0.750
2010-10-16 11.64 0.750
2010-10-16 23.81 0.750
2010-10-17 11.98 0.750
2010-10-18 0.15 0.750
2010-10-18 12.32 0.750
2010-10-19 0.49 0.750

Clear Skies, Petr [2010-09-21 11:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 21:45 UT. Best wishes, Kamil [2010-09-20 23:42, Ondrejov] Message sent to observers

· Observing from 21:15 UT. Peter K. [2010-09-19 21:27, Ondrejov]

· Began run from Prompt 0245 UT 9/10/2010. Should get ~7 hours. Joe [2010-09-10 05:09, Dark Sky & PROMPT] Message sent to observers

· This object I observed this night From 21:20 UT. Gabo [2010-09-07 21:02, SkalnatePleso] [Remove]

· Peter has taken the first initial night of this apparition for this return binary. A constrained solution (with the periods fixed at the values we observed in 2009):
http://www.asu.cas.cz/~asteroid/03868_10_porb.png
No obvious event captured (but the data cover only 23% of the orbit). There is apparent a small variation in the residuals, with an amplitude of 0.03 mag, it may be a rotation of unsynchronous secondary (the data from the previous apparition were not of a sufficient quality to constrain that). More observations are needed 1) to cover the orbit more so that we capture events (or show that there are no events now, if we are away from the eclipse geometry), and 2) to confirm the possible second rotation period.

Clear Skies, Petr [2010-09-07 12:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21:30 UT. Peter K. [2010-09-06 22:26, Ondrejov]

· Our discovery announcement on this binary has appeared on CBET 1835. I'm going to update the Survey's web pages accordingly.

Cheers, Petr

(3868) MENDOZA
J. Oey, Leura Observatory, Leura, N.S.W., Australia; P. Pravec, P.
Kusnirak, and K. Hornoch, Ondrejov Observatory; J. Brinsfield, Via Capote
Observatory, Thousand Oaks, CA, U.S.A.; V. Chiorny, Kharkiv Observatory; D.
Pray, Carbuncle Observatory, W. Brookfield, MA, U.S.A.; and M. Pikler and M.
Husarik, Skalnate Pleso Observatory, report that photometric observations
obtained during Apr. 25 to May 25 reveal that minor planet (3868) is a binary
system with an orbital period of 24.38 hr. The primary shows a period of
2.77090 ± 0.00005 hr and has a lightcurve amplitude of 0.10 mag, suggesting
a nearly spheroidal shape. Mutual eclipse/occultation events with a depth of
0.05 mag indicate a secondary-to-primary mean-diameter ratio of 0.22 ± 0.02.
The mean absolute R-band magnitude and the slope parameter of the system are
H_R = 12.30 ± 0.04 and G_R = 0.23 ± 0.05.

2009 June 6 (CBET 1835) Daniel W. E. Green [2009-06-06 09:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 20:05 UT. Best wishes, Kamil [2009-05-25 20:06, Ondrejov] Message sent to observers

· I will try this one from 20:15 UT. Best wishes, Kamil [2009-05-24 19:55, Ondrejov]

· Started this one at 01:30 UT.
Don [2009-05-21 02:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Kamil has captured parts of mutual events (depth 0.07 mag) on each of the past three nights May 16.9, 17.9, and 19.9. Their period is nearly commensurate with one day, but fortunately they are moving into the nightly window for Central Europe during these days, so Kamil will cover the events more on following nights, if weather cooperates. (On the last night, he has already covered about 2/3 of the event.)
http://www.asu.cas.cz/~asteroid/03868_09_p1.png
http://www.asu.cas.cz/~asteroid/03868_09_porb.png
The orbital period appears to be 24.38 h, but we need to nail it down. One more coverage of the 0.75-phase event is needed as well to nail down D_2/D_1. There remain some nonfitting data from two stations: the night Apr. 30.9 from Kharkiv and some recent data from Leura; I will communicate with Vasilij and Julian separately. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 5-20 20.74 0.250
2009- 5-21 21.12 0.250
2009- 5-22 21.50 0.250
2009- 5-23 21.88 0.250
2009- 5-24 22.26 0.250
2009- 5-25 22.64 0.250
2009- 5-26 23.02 0.250
2009- 5-27 23.40 0.250
2009- 5-28 23.78 0.250
2009- 5-30 0.16 0.250
2009- 5-31 0.54 0.250
2009- 6- 1 0.92 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2009- 5-20 8.42 0.745
2009- 5-21 8.80 0.745
2009- 5-22 9.18 0.745
2009- 5-23 9.56 0.745
2009- 5-24 9.94 0.745
2009- 5-25 10.32 0.745
2009- 5-26 10.70 0.745
2009- 5-27 11.08 0.745
2009- 5-28 11.46 0.745
2009- 5-29 11.84 0.745
2009- 5-30 12.22 0.745
2009- 5-31 12.60 0.745
2009- 6- 1 12.98 0.745

Clear Skies, Petr [2009-05-20 06:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 01:15 UT.
Don [2009-05-20 01:19, CarbuncleHill]

· I will be observing this one from 20:00 UT in good conditions. Best wishes, Kamil [2009-05-19 18:45, Ondrejov] Message sent to observers

· Observing this one from 19:50 UT. Best wishes, Kamil [2009-05-17 19:55, Ondrejov]

· observed from 08:48UT to 17.09UT 2009-05-16. data sent in. [2009-05-17 12:47, Blue Mountains Obs] Message sent to observers

· Observing this one from 20:03 UT. Best wishes, Kamil [2009-05-16 23:22, Ondrejov]

· observed from 08:48UT to 17.09UT 2009-05-16. data sent in. [2009-05-16 23:15, Blue Mountains Obs] Message sent to observers

· Started a run on this at 01:30 UT.
Don [2009-05-16 02:24, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· 2 more nights of observations done. 2009-05-13 started from 09:11UT to 18:02UT and 2009-05-14 started from 10:05UT to 17:12UT. Good data on first night but poor seeing on second. Again, unconfirmed attenuation near the end of the run. [2009-05-15 13:33, Blue Mountains Obs] Message sent to observers

· Started at 02:00 UT.
Don [2009-05-14 02:00, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started 3868 at 0030 UT from Prompt. Should be able to follow it until about 0830 UT. Joe [2009-05-13 01:19, Dark Sky & PROMPT] Message sent to observers

· I plan to start this one at about 01:30 UT. Session should last about 5 hr.
Don [2009-05-13 01:08, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· A long session completed successfully with no significant effect from the moon. the last hour may have recorded an event. Unfortunately its too noisy. Data sent in. [2009-05-12 12:58, Blue Mountains Obs] Message sent to observers

· Clear night but moon approaching. Observed from 10.37UT to 18:14UT. No event noted. [2009-05-07 11:50, Blue Mountains Obs]

· This serious binary suspect (from observations in 2006 by Julian Oey et al.) has been observed during the past two weeks on 7 long and 3 partial nights by Julian from Leura, by Peter and Kamil from here, by Jim from Via Capote, by Vasilij from Kharkiv, and by Michal and Marek from S. Pleso. The primary period is well established (and in agreement with the estimate from the 2006 data), one clear and one possible (at the beginning of a session) attenuation captured; the clear one is in a short session 2009-04-30.9 by Vasilij:
http://www.asu.cas.cz/~asteroid/03868_09.png
http://www.asu.cas.cz/~asteroid/03868_090430.png
Obviously, with its apparently longish P_orb, it is a tough binary to establish, and a more concentrated effort is needed. It passed through opposition a week ago and it will be still observable in the next lunation. I encourage all who can observe it with errors not greater than 0.03 mag (apparently all stations which have worked it in the past two weeks, plus some other ones) to concentrate on it so that we capture more events and really establish it.

Clear Skies, Petr [2009-05-06 07:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed under good conditions for just over 6 hours. No attenuation's were noted [2009-05-04 14:13, Via Capote] Message sent to observers

· Observing this object from 04:30UT under good conditions. Some high thin clouds may move through latter in session [2009-05-04 04:09, Via Capote]

· Observing from 20:10 UT in good conditions. Michal [2009-05-03 20:14, SkalnatePleso] [Remove]
Message sent to observers

· observation done from 12UT for 6 hours interupted by occasional clouds. No event noted. [2009-05-02 23:39, Blue Mountains Obs]

· observed under good conditions for about 6 hours. Data does not show any attenuation's on the 2.8 hr rotation period. [2009-04-29 13:17, Via Capote] Message sent to observers

· I plan to begin observation of this object at 0515UT Conditions are good [2009-04-29 03:21, Via Capote]

· Observed from 21:20 UT for 5 hours. Peter K. [2009-04-29 02:16, Ondrejov] Message sent to observers

· Julian has taken first three nights for this return binary suspect. (In 2006 we saw attenuations, but didn't establish it well.) His recent data show what may be an event, further intensive observations are needed to capture more events and establish their period. I encourage all who can observe it with errors not greater than 0.03 mag to help out so that we can establish it.
http://www.asu.cas.cz/~asteroid/03868_a9.png

Clear Skies, Petr [2009-04-28 13:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· started to observe this target in the past 3 nights. Data sent in. [2009-04-28 02:40, Blue Mountains Obs]

(10988) Feinstein (Finished) [Add new note]
· This new target was done by Peter Kusnirak, Jan Vrastil and Kamil Hornoch from here, by Don Pray from Sugarloaf Mountain, and by Gabo Cervak and Marek Husarik from Skalnate Pleso: U = 3- solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/10988.png
Target done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Cheers, Petr [2016-05-12 08:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 03:40 UT.
Don [2016-05-09 01:20, Sugarloaf]

· I should have made this entry earlier. I started this at 04:20, Apr 28 UT. It looked like a fairly fast rotator.

Don [2016-04-30 00:01, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a new target at 22:45 UT. Gabo [2016-04-29 23:15, SkalnatePleso] [Remove]

(21126) Katsuyoshi (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain on four nights: Unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/21126.png
Target finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-05-12 08:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target on Apr 17, 01:50 UT.
Don [2016-04-17 14:34, Sugarloaf]

(14965) Bonk (Finished) [Add new note]
· This new target was observed by Vladimir Benishek from Sopot, by Romain Montaigut and Arnaud Leroy from OPERA Observatory, and by Walt Cooney and coll. from SRO: Unique solution, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/14965.png
Target finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-05-12 08:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will run from SRO tonight. -Walt [2016-05-10 01:13, Sonoita] Message sent to observers

· Vladimir Benishek has taken three partial nights (with gaps) for this new target from Sopot. The solution is nearly unique (U = 2+ or 3-), but it needs to be nailed down, and the coverage needs to be improved.
http://www.asu.cas.cz/~asteroid/14965.png
Weather forecast for Vladimir's station is bad for almost one week. He would appreciate if someone could help him, taking one full night (in good conditions only; don't bother in sub-optimal conditions). I encourage you to help out Vladimir.

Clear Skies, Petr [2016-04-29 13:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this target on 3 nights: Apr. 15-16, 20:01-02:32 UT, Apr. 16-17, 19:13-01:59 UT and Apr. 26-27, 18:47-02:25 UT.
Vladimir [2016-04-27 19:54, Sopot AO]

(31013) 1996 DR (Finished) - slow rotator [Add new note]
· This slow rotator is closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-05-10 10:18, Ondrejov]

· I started to work with this object 2 nigths ago. I have 2 session reduced. [2016-04-15 05:31, IAO-Isaac Aznar Obs.] Message sent to observers

· Started a run at 01:20 UT.
Don [2016-04-15 01:22, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I've done two runs on this and have started a third at 01:30 UT.
Don [2016-04-13 02:14, Sugarloaf]

(18851) Winmesser (Finished) - slow rotator [Add new note]
· Julian Oey has observed this new target from Leura on 10 nights, found it to have a longish period. The period solution is unique. The G parameter had to varied, with the best fit achieved for G = -0.02. No significant deviation greater than 0.03 mag (which is an expected accuracy of Julian's linkages).
http://www.asu.cas.cz/~asteroid/18851.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian.

Cheers, Petr [2016-05-10 09:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 04/27 and 04/28. No more observations intended at this apparition [2016-04-30 10:57, Blue Mountains Obs] Message sent to observers

· observed 03/30 full night [2016-03-31 08:45, Blue Mountains Obs]

· observed 03/16 starting at 15.5 UT [2016-03-19 21:36, Blue Mountains Obs]

· observed tonight 03/18 starting at 11UT. [2016-03-18 11:13, Blue Mountains Obs] Message sent to observers

· observed on 03/09 and 03/13. period is> 20h possibly 24h commensurate rotation. [2016-03-17 12:37, Blue Mountains Obs]

· Starting new target tonight [2016-03-07 12:42, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(35259) 1996 HN24 (Finished) [Add new note]
· Closing this slow rotator,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-05-09 11:28, Ondrejov]

· Planning to start this new target at 02:00 UT.
Don [2016-04-15 01:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3002) Delasalle (Finished) [Add new note]
· This new target was done by Julian Oey from Leura on two nights plus a fraction of third night, and by Romain Montaigut and Arnaud Leroy from OPERA Observatory on one night: Unique solution, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/03002.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-05-09 10:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 05/03 for from 13UT for 6 hours [2016-05-04 21:13, Blue Mountains Obs] Message sent to observers

· Observed last night from 05/03 21:27 to 05/04 02:37 UT.
Romain and Arnaud [2016-05-04 10:55, OPERA]

· observed 05/02 from 12:55UT for 6.5 hours [2016-05-03 10:06, Blue Mountains Obs] Message sent to observers

· start this new target. Preliminary period of 6.6h [2016-04-27 09:46, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(6138) 1991 JH1 (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain: Unique period, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/06138.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Cheers, Petr [2016-04-20 10:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 02:00 UT.
Don [2016-04-15 01:26, Sugarloaf]

· Started a run on this at 02:10 UT.
Don [2016-04-13 02:16, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2195) Tengstrom (Finished) - prime suspect [Add new note]
· This return "prime suspect" was done by Don Pray from Sugarloaf Mountain: Excellent coverage, no significant deviation seen.
http://www.asu.cas.cz/~asteroid/02195_b6.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-04-20 09:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start a run on this returning "prime suspect" at 02:45 UT.
Don [2016-04-13 02:19, Sugarloaf]

· Yes, this target is done. Nice work, David! Peter K. [2007-08-22 11:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-20 from 10:29UT to 19:45UT in reasonable conditions. Period refined to 2.82112 +/- 0.00007hrs with an amplitude of 0.17 +/- 0.01mag. No deviations detected. I believe this target is done. [2007-08-20 21:57, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-08 from 11:14UT to 18:22UT in windy conditions forcing me to image at BIN 2x2. Wind affected stars were still measured and included in the plot since the SNR was very high. No significant deviations noted outside the error margins. Period refined to 2.8214 +/- 0.0004hrs with an amplitude of 0.2 +/- 0.01mag.

Data sent to Petr and Peter. [2007-08-09 02:04, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-06 from 11:45UT to 17:30UT in good conditions that ended in heavy fog. Period refined to 2.8215 +/- 0.0005 hrs with an amplitude of 0.20 +/- 0.005mag. No deviations detected. [2007-08-06 23:27, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-03 from 12:03UT to 16:08UT in varying conditions cut short by wind and cloud. Initial period fit is 2.84 +/- 0.03hrs with an amplitude of 0.2 +/- 0.01mag. Coverage is too sparse to determine any deviations. [2007-08-04 02:52, HuntersHill] Message sent to BinAstPhotSurvey conference

(3792) Preston (Finished) - binary suspect [Add new note]
· This off-list target (selected by Vladimir Benishek) is a binary suspect, there is a marginally detected second period of 23.8 h (assuming bimodal lightcurve) with an amplitude of 0.03 mag and a few possible shallow attenuations, but we have not got a satisfactory solution for them.
http://www.asu.cas.cz/~asteroid/03792_2016a_p1.png
http://www.asu.cas.cz/~asteroid/03792_2016a_p2.png
http://www.asu.cas.cz/~asteroid/03792_2016a_p2_nsp.png
http://www.asu.cas.cz/~asteroid/03792_2016b_p1.png
http://www.asu.cas.cz/~asteroid/03792_2016b_p2.png
http://www.asu.cas.cz/~asteroid/03792_2016b_p2_nsp.png

Target closed.

Petr [2016-04-14 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data obtained on Mar. 27-28, 20:19-03:05 UT.
Vladimir [2016-03-28 09:53, Sopot AO]

· Observed on Mar. 18, 18:37-00:27 UT.
Albino [2016-03-20 11:11, OAVdA (B04)] Message sent to BinAstPhotSurvey conference

· Observed on Mar. 16, 00:35-02:10 UT and Mar. 16-17, 18:14-03:31 UT.
Vladimir [2016-03-17 13:44, Sopot AO]

· Observed last night from Sopot (Mar. 14-15, 18:26-03:31 UT).
Vladimir [2016-03-15 13:04, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed on Mar. 08-09, 18:16-03:03 UT.
Vladimir [2016-03-09 12:28, Sopot AO]

· New data obtained on this one last night (Feb. 24-25, 17:31-04:12 UT).
Vladimir [2016-02-25 14:10, Sopot AO] Message sent to BinAstPhotSurvey conference

· I got some new data last night (Feb. 11, 20:30-23:38 UT).
Vladimir [2016-02-12 14:12, Sopot AO] Message sent to observers

· Vladimir Benishek observed this new target (which he selected off-list) from Sopot on several nights, 4 of them were long runs. The data don't fit well with a single period, it appears to be a binary candidate. A tentative decomposition of the four long runs:
http://www.asu.cas.cz/~asteroid/03792_p1.png
http://www.asu.cas.cz/~asteroid/03792_porb.png
(The P_orb solution is not unique.)

Vladimir's weather is unstable and he would appreciate a collaboration by others here. I encourage you to help him with taking long runs (errors < 0.03 mag needed).

Clear Skies, Petr [2016-02-08 13:26, Ondrejov] Message sent to BinAstPhotSurvey conference

(2568) Maksutov (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain and by Vladimir Benishek from Sopot: Unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/02568.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-04-14 06:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:30 UT.
Don [2016-04-13 02:12, Sugarloaf] Message sent to observers

· Observed on Apr. 06, 20:23-22:16 UT and Apr. 11-12, 18:55-02:20 UT.
Vladimir [2016-04-12 21:11, Sopot AO]

· I plan to start this new target at 02:00 UT.
Don [2016-04-06 01:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

(10301) Kataoka (Finished) [Add new note]
· Julian Oey has done this new target from Leura on four nights: A good solution (U = 3-), good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/10301.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-04-13 07:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 12UT tonight [2016-04-02 12:22, Blue Mountains Obs] Message sent to observers

· started observation of this new target at 12.5UT 03/31 [2016-04-01 04:15, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2604) Marshak (Finished) - slow rotator [Add new note]
· This slow rotator is closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-04-06 10:48, Ondrejov]

· Initial data obtained on Apr. 04, 01:03-03:03 UT.
Vladimir [2016-04-05 15:54, Sopot AO] Message sent to BinAstPhotSurvey conference

(9414) Masamimurakami (Finished) [Add new note]
· Vladimir Benishek has done this new target from Sopot on four nights: Good solution, no significant deviation,
http://www.asu.cas.cz/~asteroid/09414.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Vladimir.

Cheers, Petr [2016-04-06 10:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Apr. 05-06, 20:34-02:26 UT.
Vladimir [2016-04-06 09:47, Sopot AO]

· Observed on Apr. 03-04, 19:03-00:55 UT.
Vladimir [2016-04-05 15:49, Sopot AO] Message sent to observers

· Observed on Apr. 02-03, 19:29-01:17 UT.
Vladimir [2016-04-03 11:37, Sopot AO] Message sent to BinAstPhotSurvey conference

· I got some initial data on this one last night (Mar. 30-31, 19:33-03:10 UT).
Vladimir [2016-03-31 10:25, Sopot AO]

(10843) 1994 YF2 (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain, by Walt Cooney and coll. from SRO, and by Jan Vrastil and Kamil Hornoch from here: A nearly unique period (U = 2+ or 3-), excellent coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/10843.png
http://www.asu.cas.cz/~asteroid/10843_nsp.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2016-03-22 05:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work again from SRO tonight. -Walt [2016-03-16 22:48, Sonoita] Message sent to observers

· Will work from SRO tonight. -Walt [2016-03-16 01:43, Sonoita]

· Don Pray has taken the first night for this new target from Sugarloaf Mountain. The data reveal a 0.10-mag amplitude lightcurve with a likely period of 3.07 h (U = 2):
http://www.asu.cas.cz/~asteroid/10843.png
http://www.asu.cas.cz/~asteroid/10843_nsp.png
At least one, better two more nights are needed to nail down (and show potential events in a case it is binary). However, Don may not be able to take the needed data soon because of his forecasted unfavorable weather on the coming nights. We encourage others here able to take data with errors about 0.01 mag for this one to help out (or maybe effectively take over).

Clear Skies, Petr [2016-03-14 14:29, Ondrejov] Message sent to BinAstPhotSurvey conference

(3738) Ots (Finished) [Add new note]
· This new target was done by Don Pray from Sugarloaf Mountain, by Julian Oey from Leura, and by Vasilij Chiorny from Kharkiv: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03738_2016b.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2016-03-21 12:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:52 UT for 5.5 hours [2016-03-13 06:36, Blue Mountains Obs] Message sent to observers

· Plan to start this at 01:50 UT.
Don [2016-03-12 00:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

· The week's weather prediction is not good. Please resume observing this target Don. [2016-03-11 13:10, Blue Mountains Obs] Message sent to observers

· I had done a session on this on Mar 3, but hadn't included a note on the web tool.
Don [2016-03-08 21:12, Sugarloaf]

· Starting new target tonight from 12.5UT [2016-03-07 12:19, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(93768) 2000 WN22 (Finished) [Add new note]
· Vladimir Benishek has done this return "prime suspect" from Sopot in its current 2nd apparition: Multiple coverage, no significant deviation seen again (as in the 1st apparition).
http://www.asu.cas.cz/~asteroid/93768_b6.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good quick bright-moon time project Vladimir.

Petr [2016-03-21 10:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· I observed this one on Mar. 17-18, 17:58-02:37 UT.
Vladimir [2016-03-18 12:34, Sopot AO]

· One full and two half nights by Stefan and Jozef from Modra: unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/93768.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Stefan and Jozef.

Cheers, Petr [2009-04-14 07:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 20:43 UT - I wish a full run up to morning.

Stefan [2009-04-13 20:48, Modra]

· Started this target around full moon, on April 10/11 and 12/13, fits well with a bimodal curve with P~2.68, A~0.29. Jozef, Stefan. [2009-04-13 05:10, Modra] Message sent to BinAstPhotSurvey conference

(26471) 2000 AS152 (Finished) - return binary [Add new note]
· Done for the 3rd apparition. Petr [2016-03-16 09:53, Ondrejov]

· observed full night tonight of outside event. [2016-03-05 12:10, Blue Mountains Obs] Message sent to observers

· short sessions on 02/03 and 03/03 of outside event. [2016-03-04 09:53, Blue Mountains Obs]

· More data are needed for getting a unique orbital model; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2-26 23.86 0.259
2016- 2-28 15.16 0.259
2016- 3- 1 6.46 0.259
2016- 3- 2 21.76 0.259
2016- 3- 4 13.06 0.259
2016- 3- 6 4.36 0.259
2016- 3- 7 19.66 0.259
2016- 3- 9 10.96 0.259
2016- 3-11 2.26 0.259
2016- 3-12 17.56 0.259
2016- 3-14 8.86 0.259

Date/Time UTC (LTc.) Phase
--------------------------
2016- 2-26 3.69 0.746
2016- 2-27 18.99 0.746
2016- 2-29 10.29 0.746
2016- 3- 2 1.59 0.746
2016- 3- 3 16.89 0.746
2016- 3- 5 8.19 0.746
2016- 3- 6 23.49 0.746
2016- 3- 8 14.79 0.746
2016- 3-10 6.09 0.746
2016- 3-11 21.39 0.746
2016- 3-13 12.69 0.746
2016- 3-15 3.99 0.746

Clear Skies, Petr [2016-02-18 09:03, Ondrejov]

· Current data we have for this binary in its present 3rd apparition:
http://www.asu.cas.cz/~asteroid/26471_2016_porb.png
http://www.asu.cas.cz/~asteroid/26471_2016_p1.png

More data are needed for getting a unique orbital model; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 1-28 12.46 0.259
2016- 1-30 3.76 0.259
2016- 1-31 19.06 0.259
2016- 2- 2 10.36 0.259
2016- 2- 4 1.66 0.259
2016- 2- 5 16.96 0.259
2016- 2- 7 8.26 0.259
2016- 2- 8 23.56 0.259
2016- 2-10 14.86 0.259
2016- 2-12 6.16 0.259
2016- 2-13 21.46 0.259
2016- 2-15 12.76 0.259
2016- 2-17 4.06 0.259

Date/Time UTC (LTc.) Phase
--------------------------
2016- 1-27 16.45 0.750
2016- 1-29 7.75 0.750
2016- 1-30 23.05 0.750
2016- 2- 1 14.35 0.750
2016- 2- 3 5.65 0.750
2016- 2- 4 20.95 0.750
2016- 2- 6 12.25 0.750
2016- 2- 8 3.55 0.750
2016- 2- 9 18.85 0.750
2016- 2-11 10.15 0.750
2016- 2-13 1.45 0.750
2016- 2-14 16.75 0.750
2016- 2-16 8.05 0.750
2016- 2-17 23.35 0.750

Clear Skies, Petr [2016-01-19 12:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this one at 03:00 UT to catch the primary event at 3.26 UT.
Don [2016-01-12 00:54, Sugarloaf] Message sent to observers

· First data for this return binary in its current 3rd apparition were taken by Don Pray from Sugarloaf Mountain (3 nights) and by Kamil Hornoch, Jan Vrastil and Katerina Honkova from here (2 nights). A decomposition:
http://www.asu.cas.cz/~asteroid/26471_2016_porb.png
http://www.asu.cas.cz/~asteroid/26471_2016_p1.png

More data (for both events) are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2016- 1-10 11.98 0.256
2016- 1-12 3.26 0.256
2016- 1-13 18.54 0.256
2016- 1-15 9.82 0.256
2016- 1-17 1.10 0.256
2016- 1-18 16.38 0.256
2016- 1-20 7.66 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2016- 1- 9 16.28 0.755
2016- 1-11 7.56 0.755
2016- 1-12 22.84 0.755
2016- 1-14 14.12 0.755
2016- 1-16 5.40 0.755
2016- 1-17 20.68 0.755
2016- 1-19 11.96 0.755

Clear Skies, Petr [2016-01-09 08:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· I Plan to start this at 03:20 UT.
Don [2016-01-08 01:19, Sugarloaf] Message sent to observers

· Plan to start this at 03:20 UT.
Don [2016-01-07 02:13, Sugarloaf]

· I plan to start this at 03:30 UT.
Don [2016-01-06 01:47, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Worked in the September lunation from Modra. The primary lightcurve described well, but events poorly covered.
http://www.asu.cas.cz/~asteroid/26471_porb_c.png
http://www.asu.cas.cz/~asteroid/26471_p1_c.png

Petr [2009-10-01 07:39, Ondrejov]

· Observing from 19:18 UT. Jozef, Leos. [2009-09-21 19:26, Modra]

· Done in the August lunation sufficiently from Modra and Skalnate Pleso. No obvious flat bottom in the secondary event, so the D_2/D_1 estimate wasn't nailed down.
http://www.asu.cas.cz/~asteroid/26471_porb_b.png
http://www.asu.cas.cz/~asteroid/26471_p1_b.png

Petr [2009-09-03 09:35, Ondrejov]

· Clear run 0030-0700 UT. Should have complete coverage of 0.75 event centered at 0413 UT. Joe [2009-08-25 07:10, Dark Sky & PROMPT] Message sent to observers

· Observing from 19:20 UT. Jozef, Leos. [2009-08-24 19:21, Modra]

· An attempt to catch 0.75 event from 21 UT.
Marek [2009-08-21 21:06, SkalnatePleso] [Remove]
Message sent to observers

· I can perhaps add some data, but while it is near background stars, I can jump to 63440 and/or 92336. I hope the weather is ok tonight. Adrian [2009-08-19 20:41, Modra] Message sent to BinAstPhotSurvey conference

· An attempt under variable cirrus cover started at 21:06 UT.

Stefan [2009-08-17 22:53, Modra] Message sent to observers

· Started to cover at least part of the secondary minimum. Some stars are interfering...Jozef, Stefan [2009-08-16 23:03, Modra]

· Nice work on the new binary, Brian et al. Extensive dataset obtained: 22 sessions from 7 stations. Current solution:
P_1 = 2.68679 +/- 0.00003 h
P_orb = 39.28 h
D_2/D_1 >= 0.36
http://www.asu.cas.cz/~asteroid/26471_p1.png
http://www.asu.cas.cz/~asteroid/26471_porb.png
Only one of the two kinds of events (occultation or eclipse, but not both) are present there. The events are not far from central, but one more good and dense session covering the secondary event is needed to nail it down; ephemeris below.

Clear Skies, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2009- 8- 3 21.58 0.756
2009- 8- 5 12.86 0.756
2009- 8- 7 4.14 0.756
2009- 8- 8 19.42 0.756
2009- 8-10 10.70 0.756
2009- 8-12 1.98 0.756
2009- 8-13 17.26 0.756
2009- 8-15 8.54 0.756
2009- 8-16 23.82 0.756
2009- 8-18 15.10 0.756
2009- 8-20 6.38 0.756
2009- 8-21 21.66 0.756
2009- 8-23 12.94 0.756
2009- 8-25 4.22 0.756
2009- 8-26 19.50 0.756
2009- 8-28 10.78 0.756
2009- 8-30 2.06 0.756 [2009-08-03 11:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning on starting this up at ~3:00UT or so, hopefully will cover the event tonight.

Russ [2009-08-03 01:05, Shed of Science] Message sent to observers

· Planning this tonight, starting from ~20.10 UT. Jozef [2009-08-01 20:01, Modra]

· Started at 3:00UT, should get maybe three or four hours on it before clouds move in.

Russ [2009-07-31 03:04, Shed of Science] Message sent to observers

· Observing tonight from 21.35 UT. Jozef [2009-07-29 21:33, Modra]

· We plan to observe this one tonight starting 20:30 UT. Jozef, Juraj. [2009-07-28 20:29, Modra]

· Clouds rolling in at 5:15. Shutting down for tonight.
Russ [2009-07-28 05:17, Shed of Science] Message sent to BinAstPhotSurvey conference

· Started at 3:15 UT. I may just get the event at 7:57 7/28 but clouds may move in.

Russ [2009-07-28 03:31, Shed of Science]

· I'm starting with this one at 19:50UT tonight. But in this night there in no eclipse/occultation event scheduled.
Marek [2009-07-27 19:48, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Started this about 0330 UT, July 23.

This is for post-discovery follow-up to refine parameters and see if the lightcurve evolves. Will send data to Ondrejov. [2009-07-23 03:33, PalmerDivide]

(2656) Evenkia (Finished) [Add new note]
· This new target was done by Vladimir Benishek from Sopot and by Julian Oey from Leura on two nights each: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/02656.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-03-14 07:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· A late start but should get about 3 hours worth of data [2016-03-05 15:21, Blue Mountains Obs] Message sent to observers

· New data obtained on Mar. 04-05, 22:24 - 03:37 UT.
Vladimir [2016-03-05 12:14, Sopot AO] Message sent to BinAstPhotSurvey conference

· Vladimir Benishek has taken first data for this new target from Sopot, they suggest a period around 7 hours:
http://www.asu.cas.cz/~asteroid/02656.png

More data are needed, but Vladimir may not be able to take them soon, so we ask for a help (or maybe effectively a takeover) by other observer(s).

Clear Skies, Petr [2016-03-04 15:05, Ondrejov] Message sent to BinAstPhotSurvey conference

(2827) Vellamo (Finished) [Add new note]
· This new target has been done well by Julian and Roger from Leura, and by Joe Pollock using the Perth telescope: Unique period, excellent coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/02827.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2016-03-11 07:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a new target tonight. [2016-03-05 15:07, Blue Mountains Obs]

(19711) 1999 TG219 (Finished) - slow rotator [Add new note]
· Julian Oey worked this new target from Leura on 17 nights, found it to be a slow rotator. A period of 135 h looks most likely, but it is not unique (and there are apparent some deviations from the mean curve that might be due to a tumbling, though a contribution from possible linkage errors and/or an evolution of the lightcurve shape is also possible),
http://www.asu.cas.cz/~asteroid/19711.png
Target closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Julian on the tough target.

Petr [2016-02-28 10:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· 10 more nights observed for the month of February. Long period with amplitude of light curve remain at 0.24m [2016-02-27 22:22, Blue Mountains Obs] Message sent to observers

· light curve is quite uncertain. some scattering of data but appears to be long period of about 44h. Data from 01/12, 01/15, 01/19, 01/30, 01/31 [2016-02-01 08:38, Blue Mountains Obs]

· start observing at 12.5UT tonight [2016-01-18 11:26, Blue Mountains Obs] Message sent to observers

· observed on 01/09 from 15:25UT for 2 hours [2016-01-17 05:45, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(39810) 1997 WQ35 (Finished) [Add new note]
· Vladimir Benishek observed this return "prime suspect" (i.e., asteroid with period and amplitude in the range where binaries are frequent, but not showing signs of binarity so far) on two past nights: Good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/39810_b6.png
Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

It was a good full-moon project Vladimir.

Cheers, Petr [2016-02-24 07:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Feb. 22-23 (21:51-02:01 UT).
Vladimir [2016-02-23 19:19, Sopot AO]

· Observed on Feb. 21-22 (21:54-03:23 UT).
Vladimir [2016-02-22 12:55, Sopot AO] Message sent to BinAstPhotSurvey conference

· This one has been done by Don from Carbuncle and by Adrian from Modra: Unique solution, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/39810.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don and Adrian.

Cheers, Petr [2009-04-06 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· As 11116 should be stopped from here for now, I could add a session for this target again. [2009-04-04 00:29, Modra] Message sent to observers

· A clear sky is here. I plan this target for a couple of hours. Then 3913 perhaps. But it still depends on several things if I manage to do so. Adrian [2009-04-02 17:22, Modra] Message sent to BinAstPhotSurvey conference

· I did a run on this on Mar 31, as well as stating one tonight. First indications are that it is a fast rotator, < 3h, with amplitude a little under 0.2m.
Don [2009-04-01 01:29, CarbuncleHill]

(16955) 1998 KU48 (Finished) [Add new note]
· Julian Oey has done this new target on four night runs (with durations >= 2 h): Unique period, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/16955.png
Done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-02-10 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on the 12/26, 12/29, 12/30 . no deviation noted for the 5.2606h period. data on the 12/30 was cloud effected but still useful. [2015-12-30 22:14, Blue Mountains Obs] Message sent to observers

· observed from 12 to 15UT 12/26 [2015-12-27 06:04, Blue Mountains Obs]

· Started a new target from 13.38UT 12/04 [2015-12-05 21:23, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3228) Pire (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain, by Jan Vrastil and Kamil Hornoch from here, and by Amadeo Aznar from Isaac Aznar Observatory: Unique period, sufficient coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/03228.png
Target done for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2016-02-08 12:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:40 UT.
Don [2016-02-07 00:40, Sugarloaf]

· I did a run on this new target on Jan 12 UT.
Don [2016-01-12 20:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2242) Balaton (Finished) - return binary [Add new note]
· Our discovery announcement on this one has appeared on CBET 4243, copied below for your convenience.

Cheers, Petr

(2242) BALATON
A. Marchini, F. Salvaggio, and R. Papini, Astronomical Observatory,
Dipartimento di Scienze Fisiche della Terra e dell'Ambiente, University
of Siena; P. Pravec, Ondrejov Observatory; D. Klinglesmith, Magdalena Ridge
Observatory; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA,
U.S.A.; P. Bacci, Astronomical Observatory of San Marcello Pistoiese, Italy;
L. Franco, Balzaretto Observatory, Rome, Italy; and A. Carbognani,
Astronomical Observatory of the Aosta Valley Autonomous Region, Italy, report
that photometric observations taken with a 0.30-m telescope at the
Astronomical Observatory of the University of Siena, a 0.36-m telescope at
the Etscorn Campus Observatory (Socorro, NM, U.S.A.), a 0.50-m telescope at
the Sugarloaf Mountain Observatory, and a 0.60-m telescope at the San Marcello
Pistoiese Observatory during 2015 Dec. 27-2016 Jan. 16 reveal that minor
planet (2242) is a binary system with an orbital period of 12.96 Â± 0.01 hr.
The primary shows a period of 2.79792 Â± 0.00009 hr and has a lightcurve
amplitude of 0.18 mag at solar phases 5-16 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.03- to
0.08-magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.25.

2016 January 23 (CBET 4243) Daniel W. E. Green [2016-01-25 11:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 23:30, Jan 13 UT and may catch the primary event if clouds hold off.
Don [2016-01-14 00:35, Sugarloaf] Message sent to observers

· I started a run at 23:00, Jan 11 UT to catch the secondary event at 12.9 UT.
Don [2016-01-12 00:53, Sugarloaf]

· I started a run on this at 01:20 UT, and should catch the primary event.
Don [2016-01-08 01:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Alessandro Marchini observed this new target on 2015-12-27 and 30 (only good runs count), then Daniel Klinglesmith effectively took over on 2016-01-03 and 04. It is a binary, see decomposition of the data:
http://www.asu.cas.cz/~asteroid/02242_porb.png
http://www.asu.cas.cz/~asteroid/02242_p1.png

More data for both events are needed to nail the solution down; an event ephemeris is below. I encourage others here to help out Alessandro and Daniel with it. Errors < 0.02 mag and sessions longer than 3 hours are needed; don't bother in less ideal conditions. The photometry is significantly complicated by that the asteroid is in dense star fields at low galactic latitudes --- be very careful to eliminate interferences with background stars.

Date/Time UTC (LTc.) Phase
--------------------------
2016- 1- 7 15.83 0.250
2016- 1- 8 4.78 0.250
2016- 1- 8 17.73 0.250
2016- 1- 9 6.68 0.250
2016- 1- 9 19.63 0.250
2016- 1-10 8.58 0.250
2016- 1-10 21.53 0.250
2016- 1-11 10.48 0.250
2016- 1-11 23.43 0.250
2016- 1-12 12.38 0.250
2016- 1-13 1.33 0.250
2016- 1-13 14.28 0.250
2016- 1-14 3.23 0.250
2016- 1-14 16.18 0.250
2016- 1-15 5.13 0.250
2016- 1-15 18.08 0.250
2016- 1-16 7.03 0.250
2016- 1-16 19.98 0.250
2016- 1-17 8.93 0.250
2016- 1-17 21.88 0.250
2016- 1-18 10.83 0.250
2016- 1-18 23.78 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2016- 1- 7 22.30 0.750
2016- 1- 8 11.25 0.750
2016- 1- 9 0.20 0.750
2016- 1- 9 13.15 0.750
2016- 1-10 2.10 0.750
2016- 1-10 15.05 0.750
2016- 1-11 4.00 0.750
2016- 1-11 16.95 0.750
2016- 1-12 5.90 0.750
2016- 1-12 18.85 0.750
2016- 1-13 7.80 0.750
2016- 1-13 20.75 0.750
2016- 1-14 9.70 0.750
2016- 1-14 22.65 0.750
2016- 1-15 11.60 0.750
2016- 1-16 0.55 0.750
2016- 1-16 13.50 0.750
2016- 1-17 2.45 0.750
2016- 1-17 15.40 0.750
2016- 1-18 4.35 0.750
2016- 1-18 17.30 0.750

Clear Skies, Petr [2016-01-07 09:03, Ondrejov] Message sent to BinAstPhotSurvey conference

(3454) Lieske (Finished) - slow rotator [Add new note]
· Slow rotator, done by Don Pray.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2016-01-19 11:42, Ondrejov]

· Started this new target at 01:00 UT.
Don [2015-10-17 01:22, Sugarloaf] Message sent to BinAstPhotSurvey conference

(10484) Hecht (Finished) - paired asteroid [Add new note]
· Stared a run on this (from last month's list) at 00:30 UT.
Don [2016-01-06 01:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Did run from Prompt last night from 0200-0940 UT under good conditions. Joe [2013-03-10 23:22, Dark Sky & PROMPT] Message sent to observers

· Done by Kamil on three nights:
http://www.asu.cas.cz/~asteroid/010484_b1.png

Well done.

Cheers, Petr [2011-09-27 07:40, Ondrejov]

· Observing this one and expecting whole night run. Best wishes, Kamil [2011-09-25 20:28, Ondrejov] Message sent to observers

· Started this one at 23:45 after (1979) Sakharov. Best wishes, Kamil [2011-09-25 02:01, Ondrejov] Message sent to BinAstPhotSurvey conference

(1016) Anitra (Finished) - semi-wide binary [Add new note]
· Frederick Pilcher took five nights for Anitra in September-October, the data showed two rotational lightcurve components with periods 5.929 and 2.609 h. Follow-up observations by Vladimir Benishek in November (with additional data taken by Frederick and Caroline Odden) revealed two attenuations. Recent observations by Vladimir from December 22 showed two more attenuations. It appears to be another semi-wide binary with asynchronous satellite, similar to the six we have in our paper
"Binary asteroid population. 3. Secondary rotations and elongations", Icarus, in press, http://www.asu.cas.cz/~ppravec/binsecrotelong_r.pdf (see section 4.2.4). Its orbital period is not clear yet ---there may be as many as four events (primary/secondary occultation/eclipse) in the current geometry---, but it seems to be on an order of 200 hours. Vladimir is going to take more observations, and Frederick and Caroline may do their part as well. They would appreciate a help by other observers on nights or times when they cannot observe it. If you can and like to help them out, please coordinate with Vladimir and Frederick (vlaben@yahoo.com, fpilcher35@gmail.com) directly.

Clear Skies, Petr [2015-12-29 12:03, Ondrejov] Message sent to BinAstPhotSurvey conference

(41588) 2000 SC46 (Finished) [Add new note]
· This new target was done by Julian Oey from Leura (6 semi-nights), supported with one semi-night by Vasilij Chiorny from Kharkiv: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/41588.png
Target done for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Best, Petr [2015-12-27 11:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 12/10, 12/14, 12/17, 12/18, 12/19, 12/26 period shown as 5.83h with no noticeable deviation [2015-12-27 06:09, Blue Mountains Obs] Message sent to observers

· observed from 13UT to 17 UT 12/16 [2015-12-16 19:03, Blue Mountains Obs]

· New target starting at 16UT 12/05 [2015-12-06 03:29, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2033) Basilea (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain: Unique period, coverage just acceptable, no significant deviation.
http://www.asu.cas.cz/~asteroid/02033.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-12-23 07:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 02:40 UT.
Don [2015-12-21 02:56, Sugarloaf]

· I started this new target on Dec 4 UT.
Don [2015-12-04 21:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2343) SidingSpring (Finished) - return binary [Add new note]
· Closed for the discovery apparition. Petr [2015-12-18 09:17, Ondrejov]

· Observed this one last night 8/9 Dec from 18:45 to 22:45 UT
Vasilij Ch. [2015-12-09 04:07, Kharkiv] Message sent to observers

· Observed last night, Dec. 04 (16:09-19:12 UT). Observations interrupted by fog.
Vladimir [2015-12-05 11:09, Sopot AO]

· observed from 11UT 12/04 for 3.5hours. Unable to take longer session than this despite low error values. That's it from me. [2015-12-05 04:34, Blue Mountains Obs] Message sent to observers

· Started a run on this at 01:50 UT to catch the secondary event.
Don [2015-12-05 02:12, Sugarloaf]

· Our discovery announcement on this one has appeared on CBET 4206, copied below for your convenience.

Cheers, Petr

(2343) SIDING SPRING
J. Pollock, D. Caton, and R. Hawkins, Appalachian State University
(ASU); P. Pravec, Ondrejov Observatory; D. Pray, Sugarloaf Mountain
Observatory, South Deerfield, MA, U.S.A.; W. Cooney and J. Gross, Sonoita
Research Observatory, Sonoita, AZ, U.S.A.; D. Terrell, Southwest Research
Institute; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia; V.
Benishek, Belgrade Astronomical Observatory; A. Galad and S. Gajdos, Modra
Observatory; R. Groom and K. Stranger, Perth Observatory; V. Chiorny, Kharkiv
Observatory; D. Reichart and J. Haislip, University of North Carolina at
Chapel Hill; and A. Smith, Gemini North, report that photometric observations
taken with a 0.35-m telescope at the ASU's Dark Sky Observatory (near Boone,
NC, USA), a 0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.50-m
telescope at the Sonoita Research Observatory, a 0.35-m telescope at the Blue
Mountains Observatory, a 0.35-m telescope at the Sopot Observatory in Serbia,
a 0.60-m telescope at the Modra Observatory, a 0.36-m telescope at the Perth
Observatory, and a 0.70-m telescope at the Grakovo station of the Kharkiv
Observatory in Ukraine during Oct. 6-Nov. 21 reveal that minor planet (2343)
is a binary system with an orbital period of 11.789 Â± 0.003 hr. The
primary shows a period of 2.10637 Â± 0.00008 hr, and has a lightcurve
amplitude of 0.15 mag at solar phases 2-15 degrees, suggesting a nearly
spheroidal shape. Mutual eclipse/occultation events that are 0.04 to
0.06 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.19. An additional brightness variation with a
period of 20.01 Â± 0.03 hr and an amplitude of 0.04 mag is present in
the observed lightcurve, that suggests a presence of a third body in the
system.

2015 December 1 (CBET 4206) Daniel W. E. Green [2015-12-02 07:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will run from SRO tonight. -Walt [2015-12-02 00:47, Sonoita] Message sent to observers

· A decomposition of our current dataset:
http://www.asu.cas.cz/~asteroid/02343_2015b_p1.png
http://www.asu.cas.cz/~asteroid/02343_2015b_p2.png
http://www.asu.cas.cz/~asteroid/02343_2015b_porb.png
http://www.asu.cas.cz/~asteroid/02343_2015a_p1.png
http://www.asu.cas.cz/~asteroid/02343_2015a_p2.png
http://www.asu.cas.cz/~asteroid/02343_2015a_porb.png

We are preparing a discovery announcement for CBET. Anyway, more data in the Nov-Dec lunation would be still useful. (For instance, the events show interesting changes that would be good to further monitor.) Long runs with errors < 0.015 mag only are needed; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-11-29 0.25 0.265
2015-11-29 12.04 0.265
2015-11-29 23.83 0.265
2015-11-30 11.62 0.265
2015-11-30 23.41 0.265
2015-12- 1 11.19 0.265
2015-12- 1 22.98 0.265
2015-12- 2 10.77 0.265
2015-12- 2 22.56 0.265
2015-12- 3 10.35 0.265
2015-12- 3 22.14 0.265
2015-12- 4 9.93 0.265
2015-12- 4 21.72 0.265
2015-12- 5 9.51 0.265
2015-12- 5 21.30 0.265
2015-12- 6 9.08 0.265
2015-12- 6 20.87 0.265
2015-12- 7 8.66 0.265
2015-12- 7 20.45 0.265
2015-12- 8 8.24 0.265
2015-12- 8 20.03 0.265
2015-12- 9 7.82 0.265
2015-12- 9 19.61 0.265
2015-12-10 7.40 0.265
2015-12-10 19.19 0.265
2015-12-11 6.97 0.265
2015-12-11 18.76 0.265
2015-12-12 6.55 0.265
2015-12-12 18.34 0.265
2015-12-13 6.13 0.265
2015-12-13 17.92 0.265
2015-12-14 5.71 0.265
2015-12-14 17.50 0.265
2015-12-15 5.29 0.265
2015-12-15 17.08 0.265
2015-12-16 4.86 0.265
2015-12-16 16.65 0.265
2015-12-17 4.44 0.265
2015-12-17 16.23 0.265
2015-12-18 4.02 0.265
2015-12-18 15.81 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2015-11-29 6.25 0.774
2015-11-29 18.04 0.774
2015-11-30 5.83 0.774
2015-11-30 17.62 0.774
2015-12- 1 5.41 0.774
2015-12- 1 17.20 0.774
2015-12- 2 4.99 0.774
2015-12- 2 16.78 0.774
2015-12- 3 4.56 0.774
2015-12- 3 16.35 0.774
2015-12- 4 4.14 0.774
2015-12- 4 15.93 0.774
2015-12- 5 3.72 0.774
2015-12- 5 15.51 0.774
2015-12- 6 3.30 0.774
2015-12- 6 15.09 0.774
2015-12- 7 2.88 0.774
2015-12- 7 14.67 0.774
2015-12- 8 2.45 0.774
2015-12- 8 14.24 0.774
2015-12- 9 2.03 0.774
2015-12- 9 13.82 0.774
2015-12-10 1.61 0.774
2015-12-10 13.40 0.774
2015-12-11 1.19 0.774
2015-12-11 12.98 0.774
2015-12-12 0.77 0.774
2015-12-12 12.56 0.774
2015-12-13 0.34 0.774
2015-12-13 12.13 0.774
2015-12-13 23.92 0.774
2015-12-14 11.71 0.774
2015-12-14 23.50 0.774
2015-12-15 11.29 0.774
2015-12-15 23.08 0.774
2015-12-16 10.87 0.774
2015-12-16 22.66 0.774
2015-12-17 10.45 0.774
2015-12-17 22.23 0.774
2015-12-18 10.02 0.774
2015-12-18 21.81 0.774

Clear Skies, Petr [2015-11-23 08:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Clear in Arizona again. Will run Siding Spring from SRO tonight too. Should be able to extend your run by a few hours Don. -Walt [2015-11-21 01:46, Sonoita] Message sent to observers

· Observing this tonight to catch the primary event.
Don [2015-11-21 00:40, Sugarloaf]

· observed tonight 11/19 from 10UT for 6 hours [2015-11-19 09:25, Blue Mountains Obs] Message sent to observers

· Observed on 11/16, 11/17 and tonight 11/18 from 10UT [2015-11-18 11:05, Blue Mountains Obs]

· I started a run on this at 23:15, Nov 17 UT.
Don [2015-11-18 01:55, Sugarloaf] Message sent to observers

· I started a run at 02:45 UT.
Don [2015-11-16 03:34, Sugarloaf]

· Will run from SRO tonight. -Walt [2015-11-10 01:07, Sonoita]

· I started a run at 01:30 UT.
Don [2015-11-09 02:39, Sugarloaf] Message sent to observers

· High quality observations by Walt Cooney and collaborators from SRO, by Don Pray from Sugarloaf Mountain, and by Vladimir Benishek from Sopot revealed that there is present a second rotational lightcurve outside events in this new binary. Its period is a bit uncertain yet, but it appears to be about 20 hours. A decomposition of the data:
http://www.asu.cas.cz/~asteroid/02343_2015b_p1.png
http://www.asu.cas.cz/~asteroid/02343_2015b_p2.png
http://www.asu.cas.cz/~asteroid/02343_2015b_porb.png

It's not clear yet whether the second rotational lightcurve belongs to the observed eclipsing satellite, or to a third body in the system. Based on dynamical considerations, the third option seems more plausible, but we have not determined it observationally from the available data. More observations are needed to nail down the solution. Errors of 0.01 mag and long sessions (covering any orbital phase) are needed; don't bother in less ideal conditions.

Clear Skies, Petr [2015-11-08 07:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working from SRO tonight. -Walt [2015-11-07 02:58, Sonoita] Message sent to observers

· Started a run on this one at 02:00 UT and hope to catch the secondary event at 04:30 UT.
Don [2015-11-05 01:59, Sugarloaf]

· Will work from SRO again tonight. -Walt [2015-11-03 01:49, Sonoita] Message sent to observers

· Observed on Nov. 01-02, ~17:48-01:58 UT.
Vladimir [2015-11-02 12:38, Sopot AO]

· Planning to run from SRO tonight. Should be able to catch the .750 event. -Walt [2015-11-02 01:08, Sonoita] Message sent to observers

· Current data for this new binary:
http://www.asu.cas.cz/~asteroid/02343_porb.png
http://www.asu.cas.cz/~asteroid/02343_p1.png

More data are needed to refine the orbital period and to hopefully resolve primary and secondary events. Data covering full events and with errors < 0.02 mag will be useful; don't bother in less optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-30 12.99 0.260
2015-10-31 0.79 0.260
2015-10-31 12.58 0.260
2015-11- 1 0.38 0.260
2015-11- 1 12.17 0.260
2015-11- 1 23.97 0.260
2015-11- 2 11.76 0.260
2015-11- 2 23.56 0.260
2015-11- 3 11.35 0.260
2015-11- 3 23.15 0.260
2015-11- 4 10.94 0.260
2015-11- 4 22.74 0.260
2015-11- 5 10.53 0.260
2015-11- 5 22.33 0.260
2015-11- 6 10.12 0.260
2015-11- 6 21.92 0.260
2015-11- 7 9.71 0.260
2015-11- 7 21.51 0.260
2015-11- 8 9.30 0.260
2015-11- 8 21.10 0.260
2015-11- 9 8.89 0.260
2015-11- 9 20.69 0.260
2015-11-10 8.48 0.260
2015-11-10 20.28 0.260
2015-11-11 8.07 0.260
2015-11-11 19.87 0.260
2015-11-12 7.66 0.260
2015-11-12 19.46 0.260
2015-11-13 7.25 0.260
2015-11-13 19.05 0.260
2015-11-14 6.84 0.260
2015-11-14 18.64 0.260
2015-11-15 6.43 0.260
2015-11-15 18.23 0.260
2015-11-16 6.02 0.260
2015-11-16 17.82 0.260
2015-11-17 5.61 0.260
2015-11-17 17.41 0.260
2015-11-18 5.20 0.260
2015-11-18 17.00 0.260
2015-11-19 4.79 0.260
2015-11-19 16.59 0.260
2015-11-20 4.38 0.260
2015-11-20 16.18 0.260
2015-11-21 3.97 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-30 18.77 0.750
2015-10-31 6.56 0.750
2015-10-31 18.36 0.750
2015-11- 1 6.15 0.750
2015-11- 1 17.95 0.750
2015-11- 2 5.74 0.750
2015-11- 2 17.54 0.750
2015-11- 3 5.33 0.750
2015-11- 3 17.13 0.750
2015-11- 4 4.92 0.750
2015-11- 4 16.72 0.750
2015-11- 5 4.51 0.750
2015-11- 5 16.31 0.750
2015-11- 6 4.10 0.750
2015-11- 6 15.90 0.750
2015-11- 7 3.69 0.750
2015-11- 7 15.49 0.750
2015-11- 8 3.28 0.750
2015-11- 8 15.08 0.750
2015-11- 9 2.87 0.750
2015-11- 9 14.67 0.750
2015-11-10 2.46 0.750
2015-11-10 14.26 0.750
2015-11-11 2.05 0.750
2015-11-11 13.85 0.750
2015-11-12 1.64 0.750
2015-11-12 13.44 0.750
2015-11-13 1.23 0.750
2015-11-13 13.03 0.750
2015-11-14 0.82 0.750
2015-11-14 12.62 0.750
2015-11-15 0.41 0.750
2015-11-15 12.21 0.750
2015-11-16 0.00 0.750
2015-11-16 11.80 0.750
2015-11-16 23.59 0.750
2015-11-17 11.39 0.750
2015-11-17 23.18 0.750
2015-11-18 10.98 0.750
2015-11-18 22.77 0.750
2015-11-19 10.57 0.750
2015-11-19 22.36 0.750
2015-11-20 10.16 0.750
2015-11-20 21.95 0.750
2015-11-21 9.75 0.750

Clear Skies, Petr [2015-10-26 09:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 01:00 UT and hope to capture the event at 4.15 UT and the beginning of the next one.
Don [2015-10-23 00:52, Sugarloaf] Message sent to observers

· Adrian Galad and Stefan Gajdos sent us their serendipitious observations of this one that they obtained while observing another asteroid. Their data cover some 50-60% of the 0.25-phase event! (Adrian says that he noticed an unusual appearance of the lightcurve, but they didn't follow up this asteroid because of their other worked targets and a less-than-optimal weather.) The orbital period is refined with their data:
http://www.asu.cas.cz/~asteroid/02343_porb.png
http://www.asu.cas.cz/~asteroid/02343_p1.png

More data will be still useful to further refine the period and to hopefully resolve which of the events is primary and which is secondary. Data covering full events and with errors < 0.02 mag will be useful; don't bother in less optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-22 16.35 0.267
2015-10-23 4.15 0.267
2015-10-23 15.94 0.267
2015-10-24 3.74 0.267

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-22 21.88 0.735
2015-10-23 9.67 0.735
2015-10-23 21.47 0.735
2015-10-24 9.26 0.735

Clear Skies, Petr [2015-10-22 14:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations by Vasilij Chiorny from Kharkiv have resolved the ambiguity in P_orb: it is 11.75 h.
http://www.asu.cas.cz/~asteroid/02343_porb.png
http://www.asu.cas.cz/~asteroid/02343_p1.png

More data are needed to nail down the orbital period and to hopefully resolve which of the events is primary and which is secondary. Data covering full events and with errors < 0.02 mag will be useful; don't bother in less optimal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-22 15.94 0.260
2015-10-23 3.69 0.260
2015-10-23 15.44 0.260
2015-10-24 3.19 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-22 9.95 0.750
2015-10-22 21.70 0.750
2015-10-23 9.45 0.750
2015-10-23 21.20 0.750
2015-10-24 8.95 0.750

Clear Skies, Petr [2015-10-22 08:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one 20/21 Oct from 19:30 UT to 01:00 UT.
Vasilij Ch. [2015-10-21 00:43, Kharkiv] Message sent to observers

· Joe Pollock has observed this new target from DSO and Perth. It's a binary, P_orb is 11.75 or 23.5 hours.
http://www.asu.cas.cz/~asteroid/02343_porb.png
http://www.asu.cas.cz/~asteroid/02343_p1.png

More data are needed to resolve the orbital period ambiguity. The event ephemeris below is for the shorter P_orb; only the "0.262-phase" events will appear if it is the longer period. I encourage others here to help out Joe.

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-20 16.93 0.262
2015-10-21 4.68 0.262
2015-10-21 16.43 0.262
2015-10-22 4.18 0.262
2015-10-22 15.93 0.262
2015-10-23 3.68 0.262
2015-10-23 15.43 0.262
2015-10-24 3.18 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-20 22.81 0.762
2015-10-21 10.56 0.762
2015-10-21 22.31 0.762
2015-10-22 10.06 0.762
2015-10-22 21.81 0.762
2015-10-23 9.56 0.762
2015-10-23 21.31 0.762
2015-10-24 9.06 0.762

Clear Skies, Petr [2015-10-20 11:05, Ondrejov] Message sent to BinAstPhotSurvey conference

(7188) Yoshii (Finished) - slow rotator [Add new note]
· Don Pray took four linked nights from Sugarloaf Mountain for this new target, found it to be a slow rotator. The period appears to be on an order of 10 days.
http://www.asu.cas.cz/~asteroid/07188.png
Target closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-12-16 07:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm starting this new target at 02:00 UT.
Don [2015-11-21 00:44, Sugarloaf]

(2972) Niilo (Finished) [Add new note]
· A high-quality run by Hana Kucakova and Peter Kusnirak from here on the past night has confirmed the quadrumodal solution:
http://www.asu.cas.cz/~asteroid/02972.png
No significant deviation seen. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-12-08 13:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray took three nights from Sugarloaf Mountain for this new target. It has a complex lightcurve, either a quadrumodal one, or with more than one component. The quadrumodal solution:
http://www.asu.cas.cz/~asteroid/02972.png

More data are needed to establish. Don will be away for the next seven days (nights), so he cannot follow up it now. We encourage others here to help out or take over.

Clear Skies, Petr [2015-12-05 16:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:50 UT.
Don [2015-12-05 02:13, Sugarloaf]

· I started the new target on Nov 30.
Don [2015-12-01 02:49, Sugarloaf]

(2468) Repin (Finished) [Add new note]
· Julian Oey observed this new target from Leura on several nights, supported with a short run by Jan Vrastil and Kamil Hornoch from here. The lightcurve is asymmetric (a modeling in the future when there is more data allowing to solve for pole will be needed to reveal whether the asymmetry is a shape or an albedo effect). No indication of binarity.
http://www.asu.cas.cz/~asteroid/02468_2015a.png
http://www.asu.cas.cz/~asteroid/02468_2015b.png
http://www.asu.cas.cz/~asteroid/02468_2015c.png
Target closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian on the interesting object.

Petr [2015-12-06 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Continued observations on 11/17,11/18,11/19, 11/24,11/25,12/04 and 12/05 to have double coverage of the light curve due to short sessions only. [2015-12-06 06:09, Blue Mountains Obs] Message sent to observers

· observed on 10/04, 10/06, 10/31,and 11/09. [2015-11-10 08:36, Blue Mountains Obs]

· additional observations done on09/13, 09/21,10/01 and 10/02 [2015-10-04 12:08, Blue Mountains Obs] Message sent to observers

· Start observing this target and found preliminary period of about 5h and 0.6m amplitude. [2015-08-30 04:16, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(4012) Geballe (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain: Unique period, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/04012.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-12-01 07:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:20 UT.
Don [2015-11-21 00:42, Sugarloaf]

· I started this new target at 01:50 UT.
Don [2015-11-10 01:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4383) Suruga (Finished) - return binary [Add new note]
· Current data for this return binary:
http://www.asu.cas.cz/~asteroid/04383_2015b_porb.png
http://www.asu.cas.cz/~asteroid/04383_2015b_p1.png
http://www.asu.cas.cz/~asteroid/04383_2015a_porb.png
http://www.asu.cas.cz/~asteroid/04383_2015a_p1.png

More data (full events, errors not greater than 0.02 mag) would be useful. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-11-29 2.21 0.268
2015-11-29 18.55 0.268
2015-11-30 10.88 0.268
2015-12- 1 3.21 0.268
2015-12- 1 19.54 0.268
2015-12- 2 11.87 0.268
2015-12- 3 4.21 0.268
2015-12- 3 20.54 0.268
2015-12- 4 12.87 0.268
2015-12- 5 5.20 0.268
2015-12- 5 21.53 0.268
2015-12- 6 13.87 0.268
2015-12- 7 6.20 0.268
2015-12- 7 22.53 0.268
2015-12- 8 14.86 0.268
2015-12- 9 7.19 0.268
2015-12- 9 23.53 0.268
2015-12-10 15.86 0.268
2015-12-11 8.19 0.268
2015-12-12 0.52 0.268
2015-12-12 16.85 0.268
2015-12-13 9.19 0.268
2015-12-14 1.52 0.268
2015-12-14 17.85 0.268
2015-12-15 10.18 0.268
2015-12-16 2.51 0.268
2015-12-16 18.85 0.268
2015-12-17 11.18 0.268

Date/Time UTC (LTc.) Phase
--------------------------
2015-11-29 10.37 0.767
2015-11-30 2.70 0.767
2015-11-30 19.04 0.767
2015-12- 1 11.37 0.767
2015-12- 2 3.70 0.767
2015-12- 2 20.03 0.767
2015-12- 3 12.36 0.767
2015-12- 4 4.70 0.767
2015-12- 4 21.03 0.767
2015-12- 5 13.36 0.767
2015-12- 6 5.69 0.767
2015-12- 6 22.02 0.767
2015-12- 7 14.36 0.767
2015-12- 8 6.69 0.767
2015-12- 8 23.02 0.767
2015-12- 9 15.35 0.767
2015-12-10 7.68 0.767
2015-12-11 0.02 0.767
2015-12-11 16.35 0.767
2015-12-12 8.68 0.767
2015-12-13 1.01 0.767
2015-12-13 17.34 0.767
2015-12-14 9.68 0.767
2015-12-15 2.01 0.767
2015-12-15 18.34 0.767
2015-12-16 10.67 0.767
2015-12-17 3.00 0.767

Clear Skies, Petr [2015-11-20 06:46, Ondrejov]

· Current data for this return binary:
http://www.asu.cas.cz/~asteroid/04383_2015_porb.png
http://www.asu.cas.cz/~asteroid/04383_2015_p1.png

More data (full events, errors not greater than 0.02 mag) would be useful. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-30 20.64 0.270
2015-10-31 12.99 0.270
2015-11- 1 5.34 0.270
2015-11- 1 21.69 0.270
2015-11- 2 14.04 0.270
2015-11- 3 6.39 0.270
2015-11- 3 22.74 0.270
2015-11- 4 15.09 0.270
2015-11- 5 7.44 0.270
2015-11- 5 23.79 0.270
2015-11- 6 16.14 0.270
2015-11- 7 8.49 0.270
2015-11- 8 0.84 0.270
2015-11- 8 17.19 0.270
2015-11- 9 9.54 0.270
2015-11-10 1.89 0.270
2015-11-10 18.24 0.270
2015-11-11 10.59 0.270
2015-11-12 2.94 0.270
2015-11-12 19.29 0.270
2015-11-13 11.64 0.270
2015-11-14 3.99 0.270
2015-11-14 20.34 0.270
2015-11-15 12.69 0.270
2015-11-16 5.04 0.270
2015-11-16 21.39 0.270
2015-11-17 13.74 0.270
2015-11-18 6.09 0.270
2015-11-18 22.44 0.270
2015-11-19 14.79 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-30 12.27 0.758
2015-10-31 4.62 0.758
2015-10-31 20.97 0.758
2015-11- 1 13.32 0.758
2015-11- 2 5.67 0.758
2015-11- 2 22.02 0.758
2015-11- 3 14.37 0.758
2015-11- 4 6.72 0.758
2015-11- 4 23.07 0.758
2015-11- 5 15.42 0.758
2015-11- 6 7.77 0.758
2015-11- 7 0.12 0.758
2015-11- 7 16.47 0.758
2015-11- 8 8.82 0.758
2015-11- 9 1.17 0.758
2015-11- 9 17.52 0.758
2015-11-10 9.87 0.758
2015-11-11 2.22 0.758
2015-11-11 18.57 0.758
2015-11-12 10.92 0.758
2015-11-13 3.27 0.758
2015-11-13 19.62 0.758
2015-11-14 11.97 0.758
2015-11-15 4.32 0.758
2015-11-15 20.67 0.758
2015-11-16 13.02 0.758
2015-11-17 5.37 0.758
2015-11-17 21.72 0.758
2015-11-18 14.07 0.758
2015-11-19 6.42 0.758
2015-11-19 22.77 0.758

Clear Skies, Petr [2015-10-26 11:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Dan Coley has taken seven nights for this one from CS3. They are interesting data as the event shapes appear to evolve rapidly:
http://www.asu.cas.cz/~asteroid/04383_2015_porb.png
http://www.asu.cas.cz/~asteroid/04383_2015_p1.png

More data are needed to monitor the events behavior. Runs covering full events and with errors < 0.02 mag should be best suited to provide understanding of the behavior; don't bother in less ideal conditions. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-14 12.83 0.257
2015-10-15 5.24 0.257
2015-10-15 21.65 0.257
2015-10-16 14.06 0.257
2015-10-17 6.47 0.257
2015-10-17 22.88 0.257
2015-10-18 15.29 0.257
2015-10-19 7.70 0.257
2015-10-20 0.11 0.257
2015-10-20 16.52 0.257
2015-10-21 8.93 0.257
2015-10-22 1.34 0.257
2015-10-22 17.75 0.257
2015-10-23 10.16 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-14 4.46 0.747
2015-10-14 20.87 0.747
2015-10-15 13.28 0.747
2015-10-16 5.69 0.747
2015-10-16 22.10 0.747
2015-10-17 14.51 0.747
2015-10-18 6.92 0.747
2015-10-18 23.33 0.747
2015-10-19 15.74 0.747
2015-10-20 8.15 0.747
2015-10-21 0.56 0.747
2015-10-21 16.97 0.747
2015-10-22 9.38 0.747
2015-10-23 1.79 0.747

Clear Skies, Petr [2015-10-13 20:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· This binary, discovered by Warner (2013), was observed recently by Dagmara Oszkiewicz with the Lowell 72inch and MANOS 1m:
http://www.asu.cas.cz/~asteroid/04383_2015_porb.png
http://www.asu.cas.cz/~asteroid/04383_2015_p1.png
Dagmara doesn't plan to take more data for it.

More data are needed. People here are encouraged to take over; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-13 19.40 0.247
2015-10-14 11.74 0.247
2015-10-15 4.08 0.247
2015-10-15 20.42 0.247
2015-10-16 12.76 0.247
2015-10-17 5.10 0.247
2015-10-17 21.44 0.247
2015-10-18 13.78 0.247
2015-10-19 6.12 0.247
2015-10-19 22.46 0.247
2015-10-20 14.80 0.247
2015-10-21 7.14 0.247
2015-10-21 23.48 0.247
2015-10-22 15.82 0.247
2015-10-23 8.16 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2015-10-14 3.56 0.747
2015-10-14 19.90 0.747
2015-10-15 12.24 0.747
2015-10-16 4.58 0.747
2015-10-16 20.92 0.747
2015-10-17 13.26 0.747
2015-10-18 5.60 0.747
2015-10-18 21.94 0.747
2015-10-19 14.28 0.747
2015-10-20 6.62 0.747
2015-10-20 22.96 0.747
2015-10-21 15.30 0.747
2015-10-22 7.64 0.747
2015-10-22 23.98 0.747

Clear Skies, Petr [2015-10-13 12:37, Ondrejov] Message sent to BinAstPhotSurvey conference

(57171) 2001 QT10 (Finished) - binary suspect [Add new note]
· Confirmation needed.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2015-11-19 15:05, Ondrejov]

· Doing a run on this tonight.
Don [2015-11-05 01:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run on this at 23:30, Nov 3 UT.
Don [2015-11-03 23:43, Sugarloaf]

· I started my 4th run on this one at 23:00, Nov 2 UT.
Don [2015-11-03 00:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

(413577) 2005 UL5 (Finished) [Add new note]
· This NEA will make a rather close approach on November 20 and the radar folks will observe it, see a note by Lance Benner: "2005 UL5 is going to be a strong radar target and we expect to get detailed radar images. It's also the target of a proof of concept radar demonstration using DSS-43 and Parkes in Australia."

Tim Lister and Sarah Greenstreet took a 3.7-h long photometric run with the LCOGT 1-m at CTIO on 2015-11-09.3. We took a 1.8-h and a 3.1-h long runs with the 1.54-m at La Silla on 2015-11-10.3 and 11.3. I have got a single-period solution with more than two maxima/minima per period:
http://www.asu.cas.cz/~asteroid/413577.png
But it is possible that the assumption of that there is a single period is wrong and that there are more than one lightcurve component (e.g., it might be a binary with a short primary period and a superimposed mutual event). More data are needed to reveal. We cannot take more data with the 1.54-m on following nights (there will run other programs) and it seems uncertain that Tim and Sarah will take more data from LCOGT as well. Your help would be highly appreciated. As usual, data with photometric errors not greater than 0.03 mag are needed and long sessions are strongly preferred. A bit of problem is that the NEA will move to the Milky Way in a few days, so photometric measurements may be difficult then. So, work it asap if you can.

Clear Skies, Petr [2015-11-11 16:42, Ondrejov] Message sent to BinAstPhotSurvey conference

(3679) Condruses (Finished) - slow rotator [Add new note]
· This slow rotator is closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-11-08 09:58, Ondrejov]

· Good run from Dark Sky on this new object on the targets list from 0400-0800 UT. Joe [2015-09-19 16:22, Dark Sky & PROMPT] Message sent to observers

· Good run from Dark Sky on this new object on the targets list from 0350-1005 UT. Plan a similar second run tonight. Joe [2015-09-18 21:23, Dark Sky & PROMPT]

(4895) Embla (Finished) [Add new note]
· Don Pray has taken three nights for this new target from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/04895.png
This is sufficient data for this one for the BinAstPhotSurvey; target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-11-06 14:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 02:00 UT.
Don [2015-11-05 01:57, Sugarloaf]

· I started this new target on Nov 3 and plan to do a run on it tonight.
Don [2015-11-03 23:04, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4323) Hortulus (Finished) - Prime Suspect [Add new note]
· Don Pray has taken two nights for this "prime suspect" from Sugarloaf Mountain in its currend 2nd apparition, confirmed the period (and found a higher amplitude than it was in the 1st apparition); no deviation apparent:
http://www.asu.cas.cz/~asteroid/04323_b5.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good, quick work Don.

Petr [2015-11-06 13:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 02:30 UT.
Don [2015-11-03 00:45, Sugarloaf]

· Peter K. has taken a third long night: it is P = 4.735 h, with a period twice as long formally not ruled out, but unlikely as it has no signals in odd harmonics. We assign U=3-. Good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/04323.png
It is done for the Survey.

Good work, guys. (And, Alan, you did bet well :-) )

Cheers, Petr [2008-09-10 11:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:20 UT. Peter K. [2008-09-09 20:18, Ondrejov] Message sent to observers

· Two nights 6.3-6.7 h long by Palo and Marek from Skalnate Pleso have shown a nearly identical lightcurve on both nights; a few periods commensurate with 23.7 hours are possible, see
http://www.asu.cas.cz/~asteroid/04323.png
One full night from another station, fairly distant in longitude from Skalnate Pleso, is needed to resolve the ambiguity. I encourage someone to help out.

Clear Skies, Petr [2008-09-02 12:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Here are two lcs http://www.ta3.sk/~mhusarik/4323/ [2008-09-02 12:07, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 19:20 conditions not to best.
Palo. [2008-09-01 20:25, SkalnatePleso] [Remove]

· Due to predicted next two cloudy nights we call for help. Here is first night's lc
http://www.ta3.sk/~mhusarik/4323/hor80831.png
Marek [2008-09-01 13:21, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 19:20 UT, good condtion. Palo. [2008-08-31 22:13, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(3873) Roddy (Finished) - return binary [Add new note]
· Our observations reveal that the system was not in event geometry in this apparition. Petr [2015-10-26 13:44, Ondrejov]

· Observed on Oct. 24, 16:46-18:55 UT.
Vladimir [2015-10-25 12:11, Sopot AO] Message sent to observers

· I started this at 00:45 UT.
Don [2015-10-23 00:53, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Hana Kucakova and Kamil Hornoch took 3.3-h worth of data for this return binary from Ondrejov on Oct. 4.1. We may not be able to take more data soon; a help would be welcome.

Clear Skies, Petr [2015-10-06 18:32, Ondrejov] Message sent to BinAstPhotSurvey conference

(52852) 1998 RB75 (Finished) - Paired Asteroid [Add new note]
· Attenuations seen, but no solution obtained. Target closed for this apparition. Petr [2015-10-26 12:22, Ondrejov]

· Started this at 00:10 UT.
Don [2015-10-13 01:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 00:30 UT.
Don [2015-10-11 00:54, Sugarloaf] Message sent to observers

· I started a run on this at 01:30 UT.
Don [2015-10-06 02:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this at 02:30 UT.
I got no useful data on the previous run.
Don [2015-09-15 01:20, Sugarloaf]

· Plan to start this at 02:50 UT.
Don [2015-09-12 00:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

(13699) Nickthomas (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain on 6 nights:
http://www.asu.cas.cz/~asteroid/13699.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Closed for the Survey. Good work Don on this target.

Cheers, Petr [2015-10-18 15:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:30 UT.
Don [2015-10-17 01:24, Sugarloaf]

· Started this one at 00:30 UT.
Don [2015-10-15 02:25, Sugarloaf]

· Observed this one 14/15 Oct from 20:20 UT to 01:20 UT.
Vasilij Ch. [2015-10-15 01:29, Kharkiv] Message sent to observers

· I started a run on this at 00:10 UT.
Don [2015-10-13 01:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 00:50 UT.
Don [2015-10-11 00:58, Sugarloaf]

· I started this new target at 02:30 UT.
Don [2015-10-08 04:04, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3982) Kastel (Finished) - return probably binary [Add new note]
· Finished in the 4th apparition. Petr [2015-10-09 00:53, Ondrejov]

· observed from 10/05 from 10UT for 5 hours. [2015-10-06 04:48, Blue Mountains Obs] Message sent to observers

· observed from 10/05 from 10UT for 5 hours. [2015-10-06 00:32, Blue Mountains Obs]

· observed on 10/01(4h),10/02(2h),10/03(2.5h),10/04(4h). Unfortunately they are of short sessions. [2015-10-05 06:33, Blue Mountains Obs] Message sent to observers

· Observed on Sep. 22 from Sopot.
Vladimir [2015-09-23 10:41, Sopot AO]

· observed 09/11 from 12:18UT [2015-09-12 07:28, Blue Mountains Obs]

· I started a run on this at 00:25 UT.
Don [2015-09-12 00:34, Sugarloaf] Message sent to observers

· observed from 11.5UT to 16.5 UT for both 09/08 and 09/09 [2015-09-10 04:56, Blue Mountains Obs]

· Started this one at 00:35 UT.
Don [2015-09-07 00:46, Sugarloaf] Message sent to observers

· I started this at 00:30 UT.
Don [2015-09-06 00:42, Sugarloaf]

· Started a run on this at 00:30 UT.
Don [2015-09-05 00:35, Sugarloaf]

· observed on 08/31 and 09/01 [2015-09-02 12:42, Blue Mountains Obs] Message sent to observers

· Extensive observations of this 2-period asteroid (probable binary) by several of you show that there were two attenuations in July:
http://www.asu.cas.cz/~asteroid/03982_201507_p1.png
http://www.asu.cas.cz/~asteroid/03982_201507_p2.png
http://www.asu.cas.cz/~asteroid/03982_201508_p1.png
http://www.asu.cas.cz/~asteroid/03982_201508_p2.png
Unfortunately, a solution for their period is far from unique yet ....

Petr [2015-08-25 13:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a run on this on Aug 17 UT.
Don [2015-08-17 18:32, Sugarloaf] Message sent to observers

· I started a run at 02:00 UT.
Don [2015-08-14 02:34, Sugarloaf]

· Started this at 02:15 UT.
Don [2015-08-10 02:18, Sugarloaf]

· Observed last night (Aug. 8-9, ~20:03 - 02:06 UT).
Vladimir [2015-08-09 11:29, Sopot AO] Message sent to observers

· Observed last night, Aug. 7-8, ~ 20:03 - 01:39 UT.
Vladimir [2015-08-08 12:05, Sopot AO]

· observed on 08/07 for 7 hours. no attenuation detected. [2015-08-08 11:20, Blue Mountains Obs] Message sent to observers

· observed 4 full nights on 07/29,07/30, 08/03, 08/06. may have captured an event. [2015-08-08 01:54, Blue Mountains Obs]

· Planning to start this at 02:25 UT.
Don [2015-08-08 01:23, Sugarloaf] Message sent to observers

· Observed on Aug. 5-6, 20:02 - 01:42 UT.
Vladimir [2015-08-06 10:27, Sopot AO]

· I'll be starting this one at 02:30 UT.
Don [2015-08-06 02:13, Sugarloaf] Message sent to observers

· Observed on 05/06 Aug from 19:00 UT to 00:40 UT.
Vasilij Ch. [2015-08-06 01:44, Kharkiv]

· Vladimir Benishek and Don Pray observed this 2-period case (probable binary) on eight nights in its current 4th apparition. The two rotational lightcurve components are seen again, but there has occurred an attenuation -suspect mutual event- in Vladimir's data on 07-22.0, see following decomposition:
http://www.asu.cas.cz/~asteroid/03982_2015_p1.png
http://www.asu.cas.cz/~asteroid/03982_2015_p2.png
This is the first time we see an attenuation in this object. More data are needed to derive its period.

Clear Skies, Petr [2015-07-27 07:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on July 24-25, ~ 21:43 - 01:40 UT.
Vladimir [2015-07-25 11:34, Sopot AO] Message sent to observers

· Observed on July 23-24,~21:33 - 01:35 UT.
Vladimir [2015-07-24 11:25, Sopot AO]

· I plan to start a run at 03:40 UT.
Don [2015-07-24 01:59, Sugarloaf]

· I observed this on July 22 and 23.
Don [2015-07-23 13:31, Sugarloaf] Message sent to observers

· Observed last night (July 22-23,~22:23 - 01:36 UT).
Vladimir [2015-07-23 10:34, Sopot AO]

· Observed from ~ 21:37 to 01:37 UT, July 21-22.
Vladimir [2015-07-22 12:29, Sopot AO] Message sent to observers

· Observed last night (July 20-21,~21:40 - 01:40 UT).
Vladimir [2015-07-21 10:34, Sopot AO]

· Observed last night from Sopot (22:40 - 01:43 UT).
Vladimir [2015-07-18 10:35, Sopot AO] Message sent to observers

· I plan to start return suspected binary this at 04:00 UT.
Don [2015-07-17 01:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Done for the 3rd apparition. Petr [2014-03-14 14:10, Ondrejov]

· Started this one at 23:50, Mar 6 UT.
Don [2014-03-07 00:55, Sugarloaf] Message sent to observers

· Unexpected clear weather allowed me to start a run at 00:15 UT. Hopefully it will stay clear.
Don [2014-03-06 00:15, Sugarloaf]

· This one may be too faint for most of us here already, but anyway ....

Don Pray has taken data for this return probable binary on eight nights from January 30 to March 4. The data show the same two additive rotational components (8.49 and 5.83 h) as in the previous two apparitions of 2005 and 2012, but now there are apparent a few drops from the mean curve, the two most pronounced ones are shown in the two lower plots:
http://www.asu.cas.cz/~asteroid/03982_14_p1.png
http://www.asu.cas.cz/~asteroid/03982_14_p2.png
http://www.asu.cas.cz/~asteroid/03982_140130.png
http://www.asu.cas.cz/~asteroid/03982_140304.png
We are not sure whether they are mutual events, but it would be good to try to confirm, so I enourage others to help out. Observations with errors not greater than 0.03 mag are needed.

Clear Skies, Petr [2014-03-05 14:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this one at 00:15 UT.
Don [2014-03-04 02:26, Sugarloaf] Message sent to observers

· I started a run at 00:20 UT.
DOn [2014-03-01 02:55, Sugarloaf]

· Started a run at 00:40 UT.
Don [2014-02-27 01:11, Sugarloaf]

· I started a run at 00:50 UT.
Don [2014-02-23 01:07, Sugarloaf] Message sent to observers

· I started a run on this at 02:00 UT.
Don [2014-02-11 02:12, Sugarloaf]

· Started with this one at 02:15 UT.
Don [2014-02-08 02:55, Sugarloaf]

· I'm planning to start a run on this at 02:15 UT, Feb 7.

Don [2014-02-06 23:19, Sugarloaf] Message sent to observers

· Plan to start a run on this at 03:00 UT.
Don [2014-01-29 23:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Closed for the 2nd apparition. Petr [2012-12-21 11:13, Ondrejov]

· Observed this object from 18:40 U.T. November 21.
Vasilij Ch. [2012-11-22 01:48, Kharkiv] Message sent to observers

· Starting this at 23:45 Nov 14 UT. This will likely be the last run on this one.
Don [2012-11-14 22:29, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 00:00, Nov. 12 UT.
Don [2012-11-12 01:17, Sugarloaf]

· Began a run at 00:35 UT.
Don [2012-11-07 00:37, Sugarloaf]

· Started this at 01:00 UT.
Don [2012-11-06 02:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Following follow-up data joined in:
2005-10-07.0 and 07.9 by Nelya Gaftonyuk and Yura Krugly from Simeiz
2005-10-29.9 and 30.8 by Yura Krugly from Kharkiv.
All but the first session have been absolutely calibrated
in the R system with errors about 0.02 mag, Yura Krugly has also measured V-R of 0.50 +/-0.02 from Kharkiv.

The follow-up observations during 10-29 to 10-31 (two nights from Kharkiv and one night from Modra) have further refined the solution for the two periods. No attenuation seen in them. The two Simeiz nights of 10-07 and 07.9 are also in nice agreement in all but a ~1-hour long part of the second night that shows a brightenning by 0.03 mag. No attenuation seen in them as well. The data see in pictures:
http://www.asu.cas.cz/~ppravec/kastel_all_a.png
http://www.asu.cas.cz/~ppravec/kastel_longpc_a.png
http://www.asu.cas.cz/~ppravec/kastel_shortpc_a.png
http://www.asu.cas.cz/~ppravec/kastel_all_b.png
http://www.asu.cas.cz/~ppravec/kastel_longpc_b.png
http://www.asu.cas.cz/~ppravec/kastel_shortpc_b.png

In addition to the results mentioned above, the calibrated R data from Ondrejov and Kharkiv gave G=0.51 +/-0.13, H_R=12.85 +/-0.08, H=13.35 +/-0.08.

So, this one remains a probable binary; since we have not seen any mutual event, we cannot derive Porb and Ds/Dp.

Great work everyone!

Cheers, Petr Pravec [2005-11-20 15:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data for this probable binary obtained by Stefan Gajdos from Modra on 2005-10-31.8. They fit well with the data of 2005-09-24 to 29, see
http://www.asu.cas.cz/~ppravec/kastel_all_a.png
http://www.asu.cas.cz/~ppravec/kastel_longpc_a.png
http://www.asu.cas.cz/~ppravec/kastel_shortpc_a.png
No indication of a developing mutual event so far. Stefan and Adrian may take their second full night tonight, to improve the coverage, but that will be (when combined with data by Yura Krugly) probably enough for this one for one.

Cheers, Petr [2005-11-01 09:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yesterday evening (Oct 30, 20 h UT) I have received a following message from Yura Krugly from Kharkiv:

I have two clear nights for observations.
Tonight and last night (from 17:30 to 24:00) (3982) Kastel is observing.

So, it looks that Yura may have two ~6.5-h long sessions for this probable binary. Since its long period is 8.5 h, at least one more night will be needed to double coverage for this one. Here at Ondrejov, during these nights we are busy with another new binary by Brian Warner, 3309 Brorfelde (we are pretty sure that it is a binary, just need to complete it with a few more nights as there remain a few things that we don't understand yet). 3982 Kastel might be a secondary target here for a night when 3309 couldn't be worked for some reason, but if someone else could take a full third night to complete the data for Kastel, it would be great.

Cheers, Petr [2005-10-31 14:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just a brief info that Peter K. has completed linkages for his observations of this probable binary. The linked data agree entirely with the two-period solution. Very nice to see it all fits together well.

Cheers, Petr [2005-10-12 15:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two new sessions joined in:
2005-09-28.3 by Walt, John and Dirk from Sonoita
2005-09-29.2 by Don from Carbuncle Hill.

The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/kastel_all.png
http://www.asu.cas.cz/~ppravec/kastel_longpc.png
http://www.asu.cas.cz/~ppravec/kastel_shortpc.png
http://www.asu.cas.cz/~ppravec/kastel_050928_sro.png
http://www.asu.cas.cz/~ppravec/kastel_050929.png
The last two pictures show the two new sessions.

Ok, the two-period solution has stabilized, we just haven't resolved the ambiguity 5.84 vs. 2.92 h in the short period. No attenuation seen, so this one remains a probable binary. We shall resume the campaign in the next lunation where its changed geometry may allow us to resolve the remaining things in the case.

I will write a draft report for IAUC and circulate it with you tomorrow.

Great work all! This one has pretty unusual characteristics.

Cheers, Petr [2005-09-29 20:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be doing a run on this tonight, although clouds may eventually shut me down.

Don [2005-09-28 22:28, CarbuncleHill]

· Data of 2005-09-28.2 by Don Pray from Carbuncle Hill joined in. The period solution begins to stabilize. The current best fit periods are 8.488 h and 5.838 h (or 2.919 h; still cannot resolve the ambiguity). The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/kastel_all.png
http://www.asu.cas.cz/~ppravec/kastel_longpc.png
http://www.asu.cas.cz/~ppravec/kastel_shortpc.png
http://www.asu.cas.cz/~ppravec/kastel_050927_rd.png
http://www.asu.cas.cz/~ppravec/kastel_050927_ond.png
http://www.asu.cas.cz/~ppravec/kastel_050928.png
The last three pictures show the three new sessions joined in today.

Ok, the situation looks that we may not be able to resolve the 5.84 vs 2.92 h ambiguity in the short period in the current geometry. (Simply, the shape of the short period component is too symmetric.) Also, a probability of detecting mutual events in the current geometry appears low. In this situation, we should stop the campaign on this extraordinary object soon. Nevertheless, the golden rule for complex cases is to take a few more data than strictly needed, so I would appreciate if those of you who have good conditions during these nights and can work the object with errors about 0.01 mag or better, took one additional night. It could be enough for this one for now. Unless something unexpected occurs there, we will stop the campaign for it then. I will write a report to IAUC then immediately. We shall resume the campaign then in the next lunation, when the changed geometry might allow us to resolve the short period ambiguity, and, if lucky, we might get developing mutual events, that would result in changing the status of this binary detection from probable to certain.

Cheers, Petr [2005-09-28 19:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just a brief info that two datasets
2005-09-27.2 by Russ Durkee from Shed of Science Observatory, MN
2005-09-27.9 by Peter Kusnirak from here
included into the solution. The long period is well established, 8.490 +/-0.001 hr. The short period estimate still fluctuates slightly; I get the best fit for 5.84 h now. Moreover, it is also not quite ruled out that it is actually half that, i.e., 2.92 h. In any case, no mutual event detected so far.

More later after joining in new data by Don and Walt et al. from the last night.

Cheers, Petr [2005-09-28 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don,

Our weather at SRO is iffy but we will try to get it tonight as well. With luck, we will pick up where you leave off tonight with some nice overlap.

-Walt [2005-09-28 02:29, Sonoita]

· Yes Peter. I'm just waiting for it to clear my observing horizon. [2005-09-28 00:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I just finished my run on (3982). It was 5 h long. Don, will you continue?

Peter [2005-09-28 00:31, Ondrejov]

· It's clear here. I'll be doing 3982 tonight. [2005-09-27 20:30, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· New data of 2005-09-27.0 by Leos Kornos and Jozo Vilagi from Modra added to the solution. They fit well with the linearly additive two-period model, the period estimates reported yesterday hold well. With the improved solution for the shape of the components, the possible "event" mentioned yesterday has been absorbed well into the updated solution now. So, the entire dataset is well explained by the additive two-period model. See pictures:
http://www.asu.cas.cz/~ppravec/kastel_all.png
http://www.asu.cas.cz/~ppravec/kastel_longpc.png
http://www.asu.cas.cz/~ppravec/kastel_shortpc.png
http://www.asu.cas.cz/~ppravec/kastel_050924.png
http://www.asu.cas.cz/~ppravec/kastel_050925.png
http://www.asu.cas.cz/~ppravec/kastel_050926.png
http://www.asu.cas.cz/~ppravec/kastel_050927.png

Further observations of high quality (errors 0.01 mag or lower, full nights) are needed to nail down the shorter period, which has not entirely stabilized yet. Observations with higher errors will be also quite useful to monitor for potential attenuation events; sessions at least a few hours long with even relatively high errors of a few 0.01 mag will be useful for the purpose. I note that though we have not seen a mutual event there yet, it is consistent with my educated guess from the available observations that this binary system is probably relatively wide, i.e., its orbital period may be relatively long. So, it may be just a matter of luck that we haven't detected an event there yet. Further monitoring may catch it.

Not depending on whether our further observations will catch a mutual event or not (so that it will become a certain or remain just a very probable binary detection), we will publish a report on this case on an IAUC. This one appears to be an extraordinary case, so we need to publish it there in any case. I will have to pay the line charges for this one probably, but never mind, this one deserves it. (Btw, we are looking for best ways how to publish such probable but non-regular detections like this one as well as 2002 XD58 and 6611 in future. Certainly a journal paper on them will be in order (after we do the planned P&SS paper on the three Hungaria binaries), but it would be good to have in place also a good way how to publish brief reports on them fast. We consider such ways.)

Cheers, Petr [2005-09-27 17:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· We'll image from SRO tonight.

-Walt [2005-09-26 20:40, Sonoita]

· That's some spectacular photometry! Good job Peter K.

Tonight (9/27), will be cloudy, but Tuesday is forecast to be clear. If that's true, I'll do a run on this. [2005-09-26 18:53, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observations by Peter K. from here during the past three nights have revealed that its lightcurve consists of two additive components. The current best estimates of the periods are 8.49 and 5.86 h. All but a short piece of data are entirely explained (with rms residual 0.006 mag, which is entirely consistent with the observational errors; Chi^2 is 0.98) as the linear sum of the two components. (The unfitting piece of data seems to be a 1.9-hr long attenuation event ~0.035-mag deep, but we will see if it holds when the solution is nailed down with further observations.) See pictures:
http://www.asu.cas.cz/~ppravec/kastel_all.png
http://www.asu.cas.cz/~ppravec/kastel_longpc.png
http://www.asu.cas.cz/~ppravec/kastel_shortpc.png
http://www.asu.cas.cz/~ppravec/kastel_050924.png
http://www.asu.cas.cz/~ppravec/kastel_050925.png
http://www.asu.cas.cz/~ppravec/kastel_050926.png
(Fyi, Peter's data are mutually linked at a level of 0.01 mag, that holds well in the analysis.)

So, this one is quite likely a binary system. We need to nail down the solution of the two rotational components, and to confirm the attenuation events (and derive Porb from them). This one seems to have parameters somewhat different from other small NEA/MB binaries we have found so far, but I wait with discussing the differences until we establish its parameters well. In any case, this one looks to be an extremely interesting case, a kind of thing we have not seen before.

We need to obtain a thorough coverage for this one. It has the highest priority now. Folks, please, coordinate in near real time so that we get a coverage as thorough as possible both from Europe and America. As for our station, the weather forecast is cloudy for tonight as well as a few following nights, so if someone else from Europe can observe it during the nights we will be clouded out (Kharkiv, Campo Catino, Modra, Skalnate Pleso), it would be great. In short, stations both in Europe and America, please work this one whenever you can, unless there really is someone else working it with a higher accuracy at the same time. Just coordinate.

Cheers, Petr Pravec [2005-09-26 15:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Peter, I've looked at your two nights data now; strange behavior indeed. It looks that a more extensive coverage (from Ondrejov as well as from another station in America) will be useful. Someone overseas, please help us to get a thorough coverage of this one.

Clear Skies, Petr [2005-09-25 18:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Second night finished (7.8 h long run) and still not clear what period is there. Amplitude increased to 0.35 mag and LC seems to be more complex (binary?) -- another night is needed.

Peter [2005-09-25 04:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I just finished ~4.5 h long run and its period seems to be in order of 8 h and ampl. ~0.25 mag. I'll continue next night.

Peter [2005-09-24 03:49, Ondrejov]

(2691) Sersic (Finished) - return binary [Add new note]
· Done in the 3rd apparition. Petr [2015-10-09 00:32, Ondrejov]

· Doing a run on this to record the primary curve and catch the first half of the secondary event.
Don [2015-09-21 01:38, Sugarloaf] Message sent to observers

· Ran from Perth from 1230-1915 UT under good conditions. Covered secondary event centered at 1638 UT. Joe [2015-09-15 19:40, Dark Sky & PROMPT]

· Ran from Dark Sky from 0200-0800 UT under excellent conditions. Covered primary event centered at 0314 UT. Joe [2015-09-15 15:09, Dark Sky & PROMPT] Message sent to observers

· observed 09/14 from 11:09 UT for 7 hours capturing 0.75 phase [2015-09-15 06:49, Blue Mountains Obs]

· Don Pray has taken first data for this return binary in its current 3rd apparition:
http://www.asu.cas.cz/~asteroid/02691_2015_porb.png
http://www.asu.cas.cz/~asteroid/02691_2015_p1.png

More data are needed for the primary and especially for the secondary event; their ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 9- 9 13.24 0.249
2015- 9-10 16.04 0.249
2015- 9-11 18.84 0.249
2015- 9-12 21.64 0.249
2015- 9-14 0.44 0.249
2015- 9-15 3.24 0.249
2015- 9-16 6.04 0.249
2015- 9-17 8.84 0.249
2015- 9-18 11.64 0.249
2015- 9-19 14.44 0.249
2015- 9-20 17.24 0.249
2015- 9-21 20.04 0.249
2015- 9-22 22.84 0.249
2015- 9-24 1.64 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2015- 9- 8 23.83 0.749
2015- 9-10 2.63 0.749
2015- 9-11 5.43 0.749
2015- 9-12 8.23 0.749
2015- 9-13 11.03 0.749
2015- 9-14 13.83 0.749
2015- 9-15 16.63 0.749
2015- 9-16 19.43 0.749
2015- 9-17 22.23 0.749
2015- 9-19 1.03 0.749
2015- 9-20 3.83 0.749
2015- 9-21 6.63 0.749
2015- 9-22 9.43 0.749
2015- 9-23 12.23 0.749
2015- 9-24 15.03 0.749

Clear Skies, Petr [2015-09-08 14:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 02:10 UT.
Don [2015-09-07 00:47, Sugarloaf] Message sent to observers

· I'll be starting this one at 02:15 UT.
Don [2015-09-06 00:40, Sugarloaf]

· I plan to start this returning binary at 02:15 UT.
Don [2015-09-05 00:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observations finished, to be closed after adding the last night from PROMPT. Petr [2014-05-12 11:47, Ondrejov]

· Began run from Prompt Tololo at 2315 UT. Covered 0.746 event centered at 0024 UT and will observe until ~0430 UT. Joe [2014-05-04 02:44, Dark Sky & PROMPT] Message sent to observers

· Additional good data were taken for this return binary by Julian Oey from Leura in the past lunation (covered the secondary event). Current data:
http://www.asu.cas.cz/~asteroid/02691_2014b_porb.png
http://www.asu.cas.cz/~asteroid/02691_2014b_p1.png
http://www.asu.cas.cz/~asteroid/02691_2014a_porb.png
http://www.asu.cas.cz/~asteroid/02691_2014a_p1.png

Last data for this apparition, ideally covering each of the two events twice, in the upcoming lunation would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-18 22.60 0.246
2014- 4-20 1.40 0.246
2014- 4-21 4.20 0.246
2014- 4-22 7.00 0.246
2014- 4-23 9.80 0.246
2014- 4-24 12.60 0.246
2014- 4-25 15.40 0.246
2014- 4-26 18.20 0.246
2014- 4-27 21.00 0.246
2014- 4-28 23.80 0.246
2014- 4-30 2.60 0.246
2014- 5- 1 5.40 0.246
2014- 5- 2 8.20 0.246
2014- 5- 3 11.00 0.246
2014- 5- 4 13.80 0.246
2014- 5- 5 16.60 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-18 9.19 0.746
2014- 4-19 11.99 0.746
2014- 4-20 14.79 0.746
2014- 4-21 17.59 0.746
2014- 4-22 20.39 0.746
2014- 4-23 23.19 0.746
2014- 4-25 1.99 0.746
2014- 4-26 4.79 0.746
2014- 4-27 7.59 0.746
2014- 4-28 10.39 0.746
2014- 4-29 13.19 0.746
2014- 4-30 15.99 0.746
2014- 5- 1 18.79 0.746
2014- 5- 2 21.59 0.746
2014- 5- 4 0.39 0.746
2014- 5- 5 3.19 0.746
2014- 5- 6 5.99 0.746

Clear Skies, Petr [2014-04-11 07:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Weather condition was very good and nearly all of 0.744 phase covered except for the last bit. 13 to 16:24 UT 04/01. [2014-04-02 01:32, Blue Mountains Obs] Message sent to observers

· I observed it 2014-03-30, 0.244(22.95UT) phase is covered.
Nelya. [2014-03-31 12:08, Simeiz]

· observed from 9 UT to 16.49UT 2014-03-21 covering 0.744 phase. [2014-03-22 07:10, Blue Mountains Obs] Message sent to observers

· Great data taken for this return binary (2nd apparition; first post-discovery) so far:
http://www.asu.cas.cz/~asteroid/02691_2014b_porb.png
http://www.asu.cas.cz/~asteroid/02691_2014b_p1.png
http://www.asu.cas.cz/~asteroid/02691_2014a_porb.png
http://www.asu.cas.cz/~asteroid/02691_2014a_p1.png

More data (covering each of the two events twice per lunation, as usual) would be useful for future modeling; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 3-19 18.95 0.244
2014- 3-20 21.75 0.244
2014- 3-22 0.55 0.244
2014- 3-23 3.35 0.244
2014- 3-24 6.15 0.244
2014- 3-25 8.95 0.244
2014- 3-26 11.75 0.244
2014- 3-27 14.55 0.244
2014- 3-28 17.35 0.244
2014- 3-29 20.15 0.244
2014- 3-30 22.95 0.244
2014- 4- 1 1.75 0.244
2014- 4- 2 4.55 0.244
2014- 4- 3 7.35 0.244
2014- 4- 4 10.15 0.244
2014- 4- 5 12.95 0.244
2014- 4- 6 15.75 0.244
2014- 4- 7 18.55 0.244
2014- 4- 8 21.35 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2014- 3-20 8.34 0.744
2014- 3-21 11.14 0.744
2014- 3-22 13.94 0.744
2014- 3-23 16.74 0.744
2014- 3-24 19.54 0.744
2014- 3-25 22.34 0.744
2014- 3-27 1.14 0.744
2014- 3-28 3.94 0.744
2014- 3-29 6.74 0.744
2014- 3-30 9.54 0.744
2014- 3-31 12.34 0.744
2014- 4- 1 15.14 0.744
2014- 4- 2 17.94 0.744
2014- 4- 3 20.74 0.744
2014- 4- 4 23.54 0.744
2014- 4- 6 2.34 0.744
2014- 4- 7 5.14 0.744
2014- 4- 8 7.94 0.744

Clear Skies, Petr [2014-03-14 13:58, Ondrejov]

· I observed 2691 at Mar 05, 0.745(20.21UT) phase is covered.
Nelya [2014-03-05 23:30, Simeiz] Message sent to observers

· Began run from Prompt Tololo under good conditions at 0040 UT. Hope to cover 0.25 phase event centered at 0647 UT. Joe [2014-03-05 00:49, Dark Sky & PROMPT]

· Julian Oey took first data (two full and two partial nights) for this return binary in its current 2nd apparition:
http://www.asu.cas.cz/~asteroid/02691_14_porb.png
http://www.asu.cas.cz/~asteroid/02691_14_p1.png

More data are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 2-10 22.59 0.244
2014- 2-19 21.07 0.244
2014- 2-20 23.88 0.244
2014- 2-22 2.69 0.244
2014- 2-23 5.50 0.244
2014- 2-24 8.31 0.244
2014- 2-25 11.12 0.244
2014- 2-26 13.93 0.244
2014- 2-27 16.74 0.244
2014- 2-28 19.55 0.244
2014- 3- 1 22.36 0.244
2014- 3- 3 1.17 0.244
2014- 3- 4 3.98 0.244
2014- 3- 5 6.79 0.244
2014- 3- 6 9.60 0.244
2014- 3- 7 12.41 0.244
2014- 3- 8 15.22 0.244
2014- 3- 9 18.03 0.244
2014- 3-10 20.84 0.244
2014- 3-11 23.65 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2014- 2-11 12.01 0.745
2014- 2-19 7.68 0.745
2014- 2-20 10.49 0.745
2014- 2-21 13.30 0.745
2014- 2-22 16.11 0.745
2014- 2-23 18.92 0.745
2014- 2-24 21.73 0.745
2014- 2-26 0.54 0.745
2014- 2-27 3.35 0.745
2014- 2-28 6.16 0.745
2014- 3- 1 8.97 0.745
2014- 3- 2 11.78 0.745
2014- 3- 3 14.59 0.745
2014- 3- 4 17.40 0.745
2014- 3- 5 20.21 0.745
2014- 3- 6 23.02 0.745
2014- 3- 8 1.83 0.745
2014- 3- 9 4.64 0.745
2014- 3-10 7.45 0.745
2014- 3-11 10.26 0.745
2014- 3-12 13.07 0.745

Clear Skies, Petr [2014-02-10 10:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting observation 02/01, 02/03 and 02/07. Event captured on the 02/07 data. [2014-02-08 04:48, Blue Mountains Obs]

· observed on both 7/25 9.5UT to 15UT and 7/26 8UT to 15UT. some bright stars in the background requiring the removal of data points. [2011-07-27 10:03, Blue Mountains Obs] Message sent to observers

· Our announcement on this new binary has appeared on CBET 2766, copied here for your convenience:

(2691) SERSIC
J. Oey, Leura, N.S.W., Australia; P. Pravec and P. Kusnirak, Ondrejov
Observatory; N. Morales and A. Thirouin, Instituto de Astrofisica de Andalucia;
J. Pollock, Appalachian State University; and D. E. Reichart, K. M. Ivarsen,
J. B. Haislip, and A. LaCluyze, Physics and Astronomy Department, University
of North Carolina, Chapel Hill, report that photometric observations taken
during 2011 June 3-July 7 reveal that minor planet (2691) is a binary system
with an orbital period of 26.81 ± 0.01 hr. The primary light-curve
component shows a period of 3.8811 ± 0.0003 hr and it has an amplitude of
0.21 mag. Observed mutual eclipse/occultation events were up to 0.45-mag
deep. From a depth of the secondary event, they estimate a lower limit on
the secondary-to-primary mean-diameter ratio of 0.43 ± 0.02.

2011 July 16 (CBET 2766) Daniel W. E. Green

Julian and Joe wish to attempt taking more data that would be useful for future modeling, if they can still take data with errors not greater than 0.03 mag. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 7-18 4.52 0.255
2011- 7-19 7.33 0.255
2011- 7-20 10.14 0.255
2011- 7-21 12.95 0.255
2011- 7-22 15.76 0.255
2011- 7-23 18.57 0.255
2011- 7-24 21.38 0.255
2011- 7-26 0.19 0.255
2011- 7-27 3.00 0.255
2011- 7-28 5.81 0.255
2011- 7-29 8.62 0.255
2011- 7-30 11.43 0.255
2011- 7-31 14.24 0.255
2011- 8- 1 17.05 0.255
2011- 8- 2 19.86 0.255
2011- 8- 3 22.67 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2011- 7-18 17.86 0.753
2011- 7-19 20.67 0.753
2011- 7-20 23.48 0.753
2011- 7-22 2.29 0.753
2011- 7-23 5.10 0.753
2011- 7-24 7.91 0.753
2011- 7-25 10.72 0.753
2011- 7-26 13.53 0.753
2011- 7-27 16.34 0.753
2011- 7-28 19.15 0.753
2011- 7-29 21.96 0.753
2011- 7-31 0.77 0.753
2011- 8- 1 3.58 0.753
2011- 8- 2 6.39 0.753
2011- 8- 3 9.20 0.753
2011- 8- 4 12.01 0.753

Cheers, Petr [2011-07-17 07:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 17.52UT to 16.17UT 06/26. Most of the secondary event captured. taken under excellent condition. [2011-06-27 00:52, Blue Mountains Obs] Message sent to observers

· Began run from Prompt under excellent conditions at 0130 UT. Hope to get most of secondary event centered at 0634 UT. Joe [2011-06-25 02:05, Dark Sky & PROMPT]

· observed from 8UT to 16.5UT 06/23 under excellent condition. primary event captured. [2011-06-24 10:20, Blue Mountains Obs] Message sent to observers

· This new binary was observed by Julian Oey from Leura, by Nicolas Morales from San Pedro de Atacama, and by Joe Pollock with PROMPT. Current solution:
http://www.asu.cas.cz/~asteroid/02691_porb.png
http://www.asu.cas.cz/~asteroid/02691_p1.png
The periods have been well established, but the size ratio has to be nailed down with at least one good coverage of the secondary event plus some phases around it; the currently available data have some uncertainties in zero points of the nightly magnitude scales. When the size ratio is nailed down, we will publish this one on CBET. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 6-19 3.22 0.263
2011- 6-20 6.02 0.263
2011- 6-21 8.82 0.263
2011- 6-22 11.62 0.263
2011- 6-23 14.42 0.263
2011- 6-24 17.22 0.263
2011- 6-25 20.02 0.263
2011- 6-26 22.82 0.263
2011- 6-28 1.62 0.263
2011- 6-29 4.42 0.263
2011- 6-30 7.22 0.263
2011- 7- 1 10.02 0.263
2011- 7- 2 12.82 0.263
2011- 7- 3 15.62 0.263
2011- 7- 4 18.42 0.263
2011- 7- 5 21.22 0.263
2011- 7- 7 0.02 0.263
2011- 7- 8 2.82 0.263

Date/Time UTC (LTc.) Phase
--------------------------
2011- 6-18 13.76 0.760
2011- 6-19 16.56 0.760
2011- 6-20 19.36 0.760
2011- 6-21 22.16 0.760
2011- 6-23 0.96 0.760
2011- 6-24 3.76 0.760
2011- 6-25 6.56 0.760
2011- 6-26 9.36 0.760
2011- 6-27 12.16 0.760
2011- 6-28 14.96 0.760
2011- 6-29 17.76 0.760
2011- 6-30 20.56 0.760
2011- 7- 1 23.36 0.760
2011- 7- 3 2.16 0.760
2011- 7- 4 4.96 0.760
2011- 7- 5 7.76 0.760
2011- 7- 6 10.56 0.760
2011- 7- 7 13.36 0.760

Clear Skies, Petr [2011-06-13 12:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 06/06, 10:30 to 16:45 UT and 06/08, 11 to 14UT. the observation on 06/08 may be and event after data was internally linked (with CSS). if so then it is consistent with a porb of 27h and 06/08 is secondary? [2011-06-09 02:05, Blue Mountains Obs] Message sent to observers

· Began observing from Prompt at 2355 UT under good conditions, but don't know how long those will last. Joe [2011-06-08 23:49, Dark Sky & PROMPT]

· Julian has observed this new target (in the field of the return "prime suspect" 3067 Akhmatova) from Leura on two nights, found it to have a short period with apparent superimposed attenuations, see
http://www.asu.cas.cz/~asteroid/02691_porb.png
While the short period of 3.88 h has been reasonably estimated (I rate it U = 3-), the period of the events needs to be nailed down with more observations. If someone can help out Julian (the asteroid is at Dec ~ -24 deg), please do so.

Clear Skies, Petr [2011-06-06 12:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(19289) 1996 HY12 (Finished) - Paired Asteroid [Add new note]
· Done for this apparition. Petr [2015-09-29 11:55, Ondrejov]

· observed on 08/10,08/16, and 08/20 [2015-08-23 03:07, Blue Mountains Obs] Message sent to observers

· I did another run on this on Aug 17.
Don [2015-08-17 18:32, Sugarloaf]

· Plan to start this at 03:30 UT.
Don [2015-08-14 02:37, Sugarloaf]

· Working on this new target tonight starting around 11UT [2015-08-08 08:22, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Have done it with the 1.54m Danish telescope from La Silla. Petr [2009-11-20 20:12, Ondrejov]

· observed from 10:54 UT 10/21 but cut short when cloud rolled in. [2009-10-21 19:35, Blue Mountains Obs]

· Started at 12:25UT 10/20. [2009-10-21 05:11, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(10188) Yasuoyoneda (Finished) [Add new note]
· Done for the 2nd apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-09-29 11:51, Ondrejov]

· Observed this target at 20:15 UT. Gabo [2015-08-14 20:25, SkalnatePleso] [Remove]
Message sent to observers

· Zuzana K. performed first data on last night. Period estiamte is 2.72 hr. She will continue on this one next night.
Marek [2015-08-12 13:13, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(4919) Vishnevskaya (Finished) [Add new note]
· Target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-09-29 11:35, Ondrejov]

· Vladimir Benishek has taken first data for this new target from Sopot, a U = 2 solution:
http://www.asu.cas.cz/~asteroid/04919.png
It would be good to take a couple nights of high quality data (errors <= 0.01 mag) in September, to nail it down and get a good coverage.

Clear Skies, Petr [2015-08-26 07:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Aug. 13-14, 21:58 - 01:41 UT and Aug. 14-15, 21:53 - 01:41 UT.
Vladimir [2015-08-15 16:52, Sopot AO]

· This new target was observed on Aug. 12-13, 23:14 - 01:39 UT.
Vladimir [2015-08-13 13:50, Sopot AO] Message sent to BinAstPhotSurvey conference

(6183) Viscome (Finished) - slow rotator [Add new note]
· Don Pray has observed this new target from Sugarloaf Mountain on 17 nights, found it to be a slow rotator. There are hints of a possible tumbling, rated PAR = -1.
http://www.asu.cas.cz/~asteroid/06183.png
Target closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-09-22 11:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this object at 20:20 UT. Gabo [2015-09-18 19:56, SkalnatePleso] [Remove]
Message sent to observers

· Observed on Aug. 9-10, 19:47 - 01:45 UT.
Vladimir [2015-08-11 16:36, Sopot AO]

· Started this one at 1:40 UT.
Don [2015-08-10 02:20, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this at 01:45 UT.
Don [2015-08-08 01:21, Sugarloaf]

· Started this new target at 02:30 UT.
Don [2015-08-06 02:31, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4145) Maximova (Finished) [Add new note]
· Vladimir has observed this new target from Sopot:
http://www.asu.cas.cz/~asteroid/04145.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-08-26 07:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Aug. 13-14, 20:53 - 02:14 UT and Aug. 14-15, 20:46 - 02:14 UT. A few data points per night.
Vladimir [2015-08-15 16:55, Sopot AO]

· A few data points were obtained between 23:00 and 02:15 UT, Aug. 12-13.
Vladimir [2015-08-13 13:47, Sopot AO]

· Observed in the same time interval like the night before, just a few data points.
Vladimir [2015-08-12 12:27, Sopot AO]

· Observed on Aug. 9-10, 21:03 - 02:07 UT and Aug 10-11, 21:03 - 02:06 UT. Obtained just a few time-separated data points per night for rotation period determination.
Vladimir [2015-08-11 16:42, Sopot AO] Message sent to BinAstPhotSurvey conference

· Observed last night (Aug. 8-9,~21:03 - 01:12 UT). Just a few time-separated data points like the previous night.
Vladimir [2015-08-09 11:39, Sopot AO]

· Observed on Aug. 7-8, 21:05 - 01:56 UT. Just a few data points were obtained with large time intervals between them for rotation period determination purpose.
Vladimir [2015-08-08 12:18, Sopot AO] Message sent to BinAstPhotSurvey conference

· I observed this new target on Aug. 6-7, 21:45 - 02:07 UT.
Vladimir [2015-08-07 12:30, Sopot AO]

(9772) 1993 MB (Finished) - binary suspect [Add new note]
· Don Pray has observed this new target from Sugarloaf Mountain extensively, supported with one short run by Vladimir Benishek from Sopot. There are two additive lightcurve components; the second one appears significant, though its amplitude is low, it has a complex shape, and its period differs from P_1 by 0.084 h only.
http://www.asu.cas.cz/~asteroid/09772_all.png
http://www.asu.cas.cz/~asteroid/09772_p1.png
http://www.asu.cas.cz/~asteroid/09772_p2.png
http://www.asu.cas.cz/~asteroid/09772_p2_nsp.png
No mutual events captured. It remains a binary suspect. We close this target for this apparition.

Great effort Don on this tough object.

Petr [2015-08-25 14:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 01:30 UT.
Don [2015-08-14 02:41, Sugarloaf] Message sent to observers

· Started this one at 01:40 UT.
Don [2015-08-10 02:22, Sugarloaf]

· I started this at 01:10 UT.
Don [2015-08-08 01:19, Sugarloaf]

· I started this at 01:15 UT.
Don [2015-08-06 02:17, Sugarloaf] Message sent to observers

· Clear sky from 22:30 UT, started observing at 23:00 UT. Gabo [2015-07-25 00:08, SkalnatePleso] [Remove]

· Observed on July 23, ~19:36 - 21:27 UT.
Vladimir [2015-07-24 11:21, Sopot AO] Message sent to observers

· Starting this one at 02:05 UT.
Don [2015-07-24 02:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I observed this on July 22+23.
Don [2015-07-23 13:35, Sugarloaf]

· Don Pray has observed this new target on six nights, found his data not fitting with a single period. The data don't allow to obtain a unique solution; a tentative decomposition (but it may be wrong):
http://www.asu.cas.cz/~asteroid/09772_p1.png
http://www.asu.cas.cz/~asteroid/09772_p2.png

More data are needed. Particularly useful would be observations from longitudes substantially different from Don's.

Clear Skies, Petr [2015-07-23 07:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this new target at 04:20 UT.
Don [2015-06-23 02:08, Sugarloaf]

(2166) Handahl (Finished) [Add new note]
· This new target was done by Julian Oey from Leura and Vasilij Chiorny from Grakovo. Thanks to the high quality and extensive coverage of their data, it's a U = 3 solution, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/02166.png
Target finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Cheers, Petr [2015-08-25 12:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed full night on 08/06. [2015-08-08 06:10, Blue Mountains Obs] Message sent to observers

· Observed last night 6/7 Aug from 19:40 UT to 00:30 UT.
Vasilij Ch. [2015-08-07 00:30, Kharkiv]

· Observed tonight 23/24 July from 21:30 UT to 00:30 UT.
Vasilij Ch. [2015-07-24 01:24, Kharkiv] Message sent to observers

· Observed last night from 20:15 UT to 00:15 UT 22/23 Jul
Vasilij Ch. [2015-07-23 00:11, Kharkiv]

· Observed from 12.5 UT tonight [2015-07-21 13:31, Blue Mountains Obs] Message sent to observers

· Started observing after obtaining data on 07/01,07/06 and 07/09 [2015-07-10 06:47, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(49953) 1999 XL215 (Finished) [Add new note]
· Julian Oey has observed this new target extensively from Leura, attempting to confirm a decreased part of the 07-28 session that was taken in strong moonlight. No significant deviation has been found in other 10 sessions taken in better sky conditions,
http://www.asu.cas.cz/~asteroid/49953.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Julian.

Petr [2015-08-22 13:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 07/21 for 14 nights to confirm a suspect attenuation on the 07/28 but no further event noted. Most likely caused by moon light or other atmospheric event. [2015-08-21 06:11, Blue Mountains Obs] Message sent to observers

· Start this new target tonight [2015-07-21 13:29, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(13290) 1998 QN75 (Finished) [Add new note]
· Closing this one (U = 2-)
http://www.asu.cas.cz/~asteroid/13290.png
http://www.asu.cas.cz/~asteroid/13290_nsp.png

Petr [2015-07-28 07:02, Ondrejov]

· I started this one at 01:50 UT.
Don [2015-07-17 02:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'm planning to start this at 02:40 UT.
Don [2015-07-07 01:45, Sugarloaf]

· I plan to start this at 04:00 UT.
Don [2015-06-23 02:05, Sugarloaf] Message sent to observers

· I plan to start this new target at 04:05 UT.
Don [2015-06-17 01:51, Sugarloaf] Message sent to BinAstPhotSurvey conference

(3782) Celle (Finished) - return binary [Add new note]
· Closed for this apparition. [2015-07-20 10:23, Ondrejov]

· observed 06/13 capturing 0.75 phase. [2015-06-17 04:42, Blue Mountains Obs] Message sent to observers

· Julian Oey has been observing this return binary, current data:
http://www.asu.cas.cz/~asteroid/03782_2015d_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015d_p1.png
http://www.asu.cas.cz/~asteroid/03782_2015c_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015c_p1.png
http://www.asu.cas.cz/~asteroid/03782_2015b_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015b_p1.png
http://www.asu.cas.cz/~asteroid/03782_2015a_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015a_p1.png

Last observations for this apparition would be good to take in June; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 6- 6 16.23 0.250
2015- 6- 8 4.80 0.250
2015- 6- 9 17.37 0.250
2015- 6-11 5.94 0.250
2015- 6-12 18.51 0.250
2015- 6-14 7.08 0.250
2015- 6-15 19.65 0.250
2015- 6-17 8.22 0.250
2015- 6-18 20.79 0.250
2015- 6-20 9.36 0.250
2015- 6-21 21.93 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2015- 6- 7 10.50 0.750
2015- 6- 8 23.07 0.750
2015- 6-10 11.64 0.750
2015- 6-12 0.21 0.750
2015- 6-13 12.78 0.750
2015- 6-15 1.35 0.750
2015- 6-16 13.92 0.750
2015- 6-18 2.49 0.750
2015- 6-19 15.06 0.750
2015- 6-21 3.63 0.750
2015- 6-22 16.20 0.750

Clear Skies, Petr [2015-05-27 08:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Attempting to capture phase 0.75 but bad weather prevent the complete event observation. [2015-05-09 23:18, Blue Mountains Obs] Message sent to observers

· Julian Oey has taken good data for this return binary in this month, partially covered one event:
http://www.asu.cas.cz/~asteroid/03782_2015c_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015c_p1.png
http://www.asu.cas.cz/~asteroid/03782_2015b_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015b_p1.png
http://www.asu.cas.cz/~asteroid/03782_2015a_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015a_p1.png

Further monitoring would be good in May; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 5- 7 4.65 0.245
2015- 5- 8 17.22 0.245
2015- 5-10 5.79 0.245
2015- 5-11 18.36 0.245
2015- 5-13 6.93 0.245
2015- 5-14 19.50 0.245
2015- 5-16 8.07 0.245
2015- 5-17 20.64 0.245
2015- 5-19 9.21 0.245
2015- 5-20 21.78 0.245
2015- 5-22 10.35 0.245
2015- 5-23 22.92 0.245
2015- 5-25 11.49 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2015- 5- 7 23.10 0.750
2015- 5- 9 11.67 0.750
2015- 5-11 0.24 0.750
2015- 5-12 12.81 0.750
2015- 5-14 1.38 0.750
2015- 5-15 13.95 0.750
2015- 5-17 2.52 0.750
2015- 5-18 15.09 0.750
2015- 5-20 3.66 0.750
2015- 5-21 16.23 0.750
2015- 5-23 4.80 0.750
2015- 5-24 17.37 0.750

Clear Skies, Petr [2015-04-29 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed for 3 nights. 04/24, 04/26 and 04/27 with event captured on 04/26. [2015-04-28 04:11, Blue Mountains Obs] Message sent to observers

· observed from 10.5 UT 04/24. [2015-04-24 11:44, Blue Mountains Obs]

· Julian Oey has taken useful outside event data on 03-26 (the primary lightcurve is changing ....)
http://www.asu.cas.cz/~asteroid/03782_2015c_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015c_p1.png

Taking more data in April will be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 4-11 7.57 0.262
2015- 4-12 20.14 0.262
2015- 4-14 8.71 0.262
2015- 4-15 21.28 0.262
2015- 4-17 9.85 0.262
2015- 4-18 22.42 0.262
2015- 4-20 10.99 0.262
2015- 4-21 23.56 0.262
2015- 4-23 12.13 0.262
2015- 4-25 0.70 0.262
2015- 4-26 13.27 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2015- 4-10 12.84 0.750
2015- 4-12 1.41 0.750
2015- 4-13 13.98 0.750
2015- 4-15 2.55 0.750
2015- 4-16 15.12 0.750
2015- 4-18 3.69 0.750
2015- 4-19 16.26 0.750
2015- 4-21 4.83 0.750
2015- 4-22 17.40 0.750
2015- 4-24 5.97 0.750
2015- 4-25 18.54 0.750
2015- 4-27 7.11 0.750

Clear Skies, Petr [2015-03-30 08:31, Ondrejov]

· observed 03/26 from 13:22 UT for 5.5 hours. [2015-03-28 11:35, Blue Mountains Obs] Message sent to observers

· Joe Pollock's additional data from Prompt joined in:
http://www.asu.cas.cz/~asteroid/03782_2015a_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015a_p1.png
http://www.asu.cas.cz/~asteroid/03782_2015b_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015b_p1.png

Updated event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-14 21.17 0.258
2015- 3-16 9.74 0.258
2015- 3-17 22.31 0.258
2015- 3-19 10.88 0.258
2015- 3-20 23.45 0.258
2015- 3-22 12.02 0.258
2015- 3-24 0.59 0.258
2015- 3-25 13.16 0.258
2015- 3-27 1.73 0.258
2015- 3-28 14.30 0.258
2015- 3-30 2.87 0.258
2015- 3-31 15.44 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-15 14.86 0.742
2015- 3-17 3.43 0.742
2015- 3-18 16.00 0.742
2015- 3-20 4.57 0.742
2015- 3-21 17.14 0.742
2015- 3-23 5.71 0.742
2015- 3-24 18.28 0.742
2015- 3-26 6.85 0.742
2015- 3-27 19.42 0.742
2015- 3-29 7.99 0.742
2015- 3-30 20.56 0.742

Clear Skies, Petr [2015-03-14 08:13, Ondrejov]

· Event ephemeris for the March lunation:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-14 20.49 0.240
2015- 3-16 9.06 0.240
2015- 3-17 21.63 0.240
2015- 3-19 10.20 0.240
2015- 3-20 22.77 0.240
2015- 3-22 11.34 0.240
2015- 3-23 23.91 0.240
2015- 3-25 12.48 0.240
2015- 3-27 1.05 0.240
2015- 3-28 13.62 0.240
2015- 3-30 2.19 0.240
2015- 3-31 14.76 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2015- 3-14 2.22 0.740
2015- 3-15 14.79 0.740
2015- 3-17 3.36 0.740
2015- 3-18 15.93 0.740
2015- 3-20 4.50 0.740
2015- 3-21 17.07 0.740
2015- 3-23 5.64 0.740
2015- 3-24 18.21 0.740
2015- 3-26 6.78 0.740
2015- 3-27 19.35 0.740
2015- 3-29 7.92 0.740
2015- 3-30 20.49 0.740

Clear Skies, Petr [2015-03-04 09:25, Ondrejov]

· Joe Pollock has observed this return binary with Prompt on the first two nights in its current apparition, captured events:
http://www.asu.cas.cz/~asteroid/03782_2015_porb.png
http://www.asu.cas.cz/~asteroid/03782_2015_p1.png

More data are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 2-24 13.65 0.240
2015- 2-26 2.22 0.240
2015- 2-27 14.79 0.240
2015- 3- 1 3.36 0.240
2015- 3- 2 15.93 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2015- 2-25 7.95 0.740
2015- 2-26 20.52 0.740
2015- 2-28 9.09 0.740
2015- 3- 1 21.66 0.740

Clear Skies, Petr [2015-02-24 05:46, Ondrejov] Message sent to BinAstPhotSurvey conference

(28892) 2000 LZ2 (Finished) [Add new note]
· Don Pray has done this new target, obtained a unique period.
http://www.asu.cas.cz/~asteroid/28892.png
We don't require a full/double coverage for asteroids with periods longer than 10 hours in the Survey, so this one is closed now.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Cheers, Petr [2015-07-20 06:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 02:05 UT.
Don [2015-07-17 02:05, Sugarloaf]

· Starting this new target at 04:30 UT.
Don [2015-06-23 02:06, Sugarloaf]

(16126) 1999 XQ86 (Finished) - paired asteroid [Add new note]
· Done sufficiently by Julian Oey.

Cheers, Petr [2015-07-20 06:08, Ondrejov]

· Start observing the paired asteroid on 07/05 and 07/06. Period is 2.981h. [2015-07-07 13:01, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3487) Edgeworth (Finished) [Add new note]
· Target closed,
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2015-07-15 07:00, Ondrejov]

· Started this at 01:40 UT.
Don [2015-06-17 01:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this new target at 02:00 UT.
Don [2015-05-29 00:46, Sugarloaf]

(24870) 1996 FJ1 (Finished) - binary suspect [Add new note]
· Two shallow attenuations were revealed in this new target with the data taken by Nelya Gaftonyuk from Simeiz and by Gabo Cervak and Marek Husarik from Skalnate Pleso on June 14-15, but none since then despite extensive efforts from several stations. It is possible that it has moved out of event geometry. Its binary nature has to be confirmed in the future. Closing the target for this apparition,
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2015-07-14 07:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· It was observed from 18:40 UT to 01 UT.
Nelya. [2015-07-10 01:33, Simeiz] Message sent to observers

· Started this at 01:40 UT.
Don [2015-07-07 01:41, Sugarloaf]

· Observing from 22:10 UT tonight (will end at 1 UT). Peter K. [2015-07-06 23:54, Ondrejov]

· I started this one at 01:40 UT and should be able to get 6.5 hours.
Don [2015-06-25 01:41, Sugarloaf] Message sent to observers

· This new target has been worked by Ninel Gaftonyuk from Simeiz, by Gabo Cervak and Marek Husarik from Skalnate Pleso, and by Jan Vrastil and Kamil Hornoch from here. There is a suspect attenuation in the first Ninel's night, see
http://www.asu.cas.cz/~asteroid/24870_p1.png
http://www.asu.cas.cz/~asteroid/24870_20150615.png

More data are needed to confirm it and establish period. Only good data (errors <= 0.02 mag) and sessions not shorter than 2 hours will likely be useful; don't bother in less optimal conditions.

Clear Skies, Petr [2015-06-24 11:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing at 20:00 UT. Gabo [2015-06-17 19:52, SkalnatePleso] [Remove]
Message sent to observers

· This object was observed from 19 h to 0:30 15 Jun.
Nelya. [2015-06-16 10:28, Simeiz]

· Observed this object from 20:00 UT. Gabo [2015-06-14 19:24, SkalnatePleso] [Remove]
Message sent to observers

· Started my telescope at 20:20 UT. Gabo [2015-06-13 20:24, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(11579) Tsujitsuka (Finished) - slow rotator [Add new note]
· Observations by Don Pray from Sugarloaf Mountain and Julian Oey from Leura, supported with one night by Vladimir Benishek from Sopot, showed this one to be a slow rotator. They are deviations suggesting it to be tumbling (PAR = -1). Target closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-07-09 09:21, Ondrejov]

· observed on 07/02,07/03,07/04,07/05/07/06 at a rate of 3 data points every hour. [2015-07-07 12:24, Blue Mountains Obs] Message sent to observers

· I started a run at 01:35 UT as a secondary target.
Don [2015-07-07 01:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Obtained a few data points over the whole night starting at 10UT to complement Don's result for this long period object. [2015-06-27 23:37, Blue Mountains Obs] Message sent to observers

· Started this at 02:00 UT.
Don [2015-06-23 02:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this at 01:40 UT.
Don [2015-06-17 01:47, Sugarloaf]

· I plan to start this new target at 02:20 UT.
Don [2015-06-07 01:49, Sugarloaf] Message sent to BinAstPhotSurvey conference

(12269) 1990 QR (Finished) - slow rotator [Add new note]
· Slow rotator, closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-06-23 07:11, Ondrejov]

· Started this at 1:40 UT.
Don [2015-06-17 01:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this slow rotator at 02:30 UT.
Don [2015-05-29 00:45, Sugarloaf]

· I've done two runs on the slow rotator, May 23 + 24.
Don [2015-05-24 22:57, Sugarloaf] Message sent to BinAstPhotSurvey conference

(10060) Amymilne (Finished) [Add new note]
· Low-amplitude object, closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-06-09 07:11, Ondrejov]

· I'll be starting this low amplitude target at 02:40 UT.
Don [2015-04-29 01:09, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start this new target at 03:15 UT.
Don [2015-04-22 00:48, Sugarloaf]

(23112) 2000 AG3 (Finished) - slow rotator [Add new note]
· Slow rotator, closed:
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-06-08 14:22, Ondrejov]

· I'll be starting this new target at 02:10 UT.
Don [2015-03-23 00:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4149) Harrison (Finished) [Add new note]
· Don has solved the mystery with the different peak heights in his first two nights, it was an observational problem. The object looks normal; unique period, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/04149.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-05-30 07:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 02:40 UT.
Don [2015-05-29 00:42, Sugarloaf] Message sent to observers

· Will work from SRO tonight unless skies are photometric and then we will get bumped. -Walt [2015-05-26 01:06, Sonoita]

· Don Pray has observed this new target on two nights. On each the observations were split into two parts; the gap between them was caused by a mechanical problem of the telescope mount. There appears to be a unique period of 3.75 h. Coincidentally, both data parts on the first night cover the same maximum, and both data parts on the second night cover the other maximum. However, their levels differ! See following picture (where the data are plotted with twice the period to facilitate visibility of the peculiar feature):
http://www.asu.cas.cz/~asteroid/04149.png

More data are needed to get understanding. I encourage you to observe it. Full-night runs in good conditions only will be probably useful; don't bother in sub-optimal conditions.

Clear Skies, Petr [2015-05-25 12:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did two runs on this, May 23+24.
Don [2015-05-24 22:55, Sugarloaf]

(17584) 1994 XF1 (Finished) - tumbler [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain, supported by Walt Cooney and coll. from SRO and by Julian Oey from Leura. The data fit with a full 2-period Fourier series; a solution with two additive Fourier series as for binaries does not give a meaningfull fit. So, despite its short periods, it appears to be a tumbler.
http://www.asu.cas.cz/~asteroid/17584.png
Closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-05-27 08:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Ran from SRO on May 22 03:45 to 08:10 UT. -Walt [2015-05-23 13:44, Sonoita] Message sent to observers

· I started this at 01:20 UT.
Don [2015-05-23 02:16, Sugarloaf]

· Will run from SRO tonight. -Walt [2015-05-18 01:16, Sonoita]

· Started a run at 01:20 UT.
Don [2015-05-15 01:31, Sugarloaf] Message sent to observers

· Started this at 01:12 UT in much better conditions than last night.
Don [2015-05-14 01:12, Sugarloaf]

· I started a run on this at 01:30 UT in breezy conditions.
Don [2015-05-13 01:52, Sugarloaf] Message sent to observers

· Don Pray has taken two and half nights for this new target from Sugarloaf Mountain. A solution is unclear yet, it may be a complex lightcurve; the following plot is just to give you an idea, it's not a trusted solution:
http://www.asu.cas.cz/~asteroid/17584.png

Don will probably need a help, especially from different longitudes.

Clear Skies, Petr [2015-05-07 14:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this new target at 01:00 UT.
Don [2015-04-29 01:07, Sugarloaf]

(2850) Mozhaiskij (Finished) [Add new note]
· Another new target done, this one by Julian Oey from Leura and by Vladimir Benishek from Sopot: An U = 3- solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/02850.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Best, Petr [2015-05-26 13:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· observation done tonight from 10:19UT. Good condition. [2015-05-25 14:18, Blue Mountains Obs] Message sent to observers

· observed from 11:33UT to 18UT. Nice condition and data to be reduced later. [2015-05-13 20:39, Blue Mountains Obs]

· Observed last night from Sopot (May 11-12, ~ 22:12 - 01:36 UT)
Vladimir [2015-05-12 11:04, Sopot AO] Message sent to observers

· Start new target from 14:15 UT [2015-05-08 14:13, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(48864) 1998 HK43 (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain, supported with one night by Jan Vrastil and Kamil Hornoch from here: Unique period, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/48864.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-05-25 11:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target last night and plan a second run starting at 02:40, May 14 UT.
Don [2015-05-14 01:16, Sugarloaf]

(3435) Boury (Finished) [Add new note]
· This new target has been done sufficiently by Julian Oey from Leura and by Don Pray from Sugarloaf Mountain,
http://www.asu.cas.cz/~asteroid/03435.png
Enough for this one within the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-05-19 13:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start a run on this at 02:40 UT.
Don [2015-05-14 01:14, Sugarloaf]

· observed from 10:53 to 18UT [2015-05-13 20:52, Blue Mountains Obs] Message sent to observers

· Started a new target at 13:49UT [2015-05-08 13:47, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(11677) 1998 DY4 (Finished) - paired asteroid [Add new note]
· Finished. Petr [2015-05-18 11:58, Ondrejov]

· I'm planning to start this at 03:45 UT.
Don [2015-04-19 01:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be starting this new target at 04:15 UT.
Don [2015-04-18 01:03, Sugarloaf]

(9186) Fumikotsukimoto (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain: Unique period, acceptable coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/09186_201504.png
http://www.asu.cas.cz/~asteroid/09186_201505.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-05-14 06:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a second run on this at 00:50 UT.
Don [2015-04-29 01:04, Sugarloaf]

2012 LC1 (Finished) [Add new note]
· Vladimir Benishek has done this new target from Sopot on two nights: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/2012lc1.png
Object done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good fast work Vladimir.

Cheers, Petr [2015-05-10 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

(11829) Tuvikene (Finished) [Add new note]
· This new target has been worked extensively by Don Pray from Sugarloaf Mountain, supported by Joe Pollock with Prompt and by Walt Cooney et al. from Sonoita. It's a long-period object. Don has seen two short drops on his first night, but they were not confirmed on later nights.
http://www.asu.cas.cz/~asteroid/11829.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-05-04 07:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· No data from last night. Broke a belt in the dome apparatus at the start of the run. -Walt [2015-04-20 01:36, Sonoita] Message sent to observers

· Will run from SRO again tonight. -Walt [2015-04-19 02:10, Sonoita]

· Will run from SRO tonight. -Walt [2015-04-16 19:26, Sonoita]

· I started a run at 00:10 UT.
Don [2015-03-23 00:20, Sugarloaf] Message sent to observers

· Started a run at 00:20 UT
Don [2015-03-20 01:33, Sugarloaf]

· I started this slow rotator at 00:20 UT.
Don [2015-03-19 00:31, Sugarloaf]

· I started a run at 00:55 UT.
Don [2015-03-13 00:55, Sugarloaf] Message sent to observers

· Did not get a run in on 2015-3-11 from SRO. Dome shutter malfunction. -Walt [2015-03-12 01:23, Sonoita]

· I plan to start this one at 00:50 UT.
Don [2015-03-12 00:03, Sugarloaf] Message sent to observers

· Will run from SRO tonight. Should start around 3:30 UT. -Walt [2015-03-11 00:54, Sonoita]

· I started this at 01:00 UT.
Don [2015-03-10 02:08, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray took the first run for this new target. Saw one (or two, if the several last points can be interpreted so as well) short drop in an otherwise gradually evolving smooth lightcurve:
http://www.asu.cas.cz/~asteroid/11829.png
Confirmation is needed. I encourage others here to help out Don when the moon is out of the way after the Full Moon.

Clear Skies, Petr [2015-03-02 12:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this new target at 01:50 UT.
Don [2015-03-01 01:12, Sugarloaf]

(5165) Videnom (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain: Good solution, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/05165.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-04-29 08:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 02:45 UT.
Don [2015-04-12 00:43, Sugarloaf]

· This new target appeared in the image set for 6438 Suarez for Mar 25. Observed for about 2 hours.
Don [2015-03-26 18:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4675) Ohboke (Finished) [Add new note]
· Insufficient data, closing the target. Petr [2015-04-29 08:19, Ondrejov]

· First night on this new target. Began 0150 UT from Prompt Tololo. Joe [2015-02-27 02:54, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(6438) Suarez (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain and by Jan Vrastil and Kamil Hornoch from here: Good solution and coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/06438.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-04-20 13:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 01:55 UT. This will likely finish it.
Don [2015-04-16 02:00, Sugarloaf]

· I'll be started a run on this at 02:45 UT
Don [2015-04-12 00:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this new target on Mar 25 and got about 2 hours on it.
Don [2015-03-26 18:11, Sugarloaf]

(12877) 1998 QF11 (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain and by Kamil Hornoch from here:
http://www.asu.cas.cz/~asteroid/12877.png
For periods longer than 10 hours, we don't require a complete coverage in the BinAstPhotSurvey; target closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-03-25 08:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 0 UT. Best wishes, Kamil [2015-03-25 00:42, Ondrejov] Message sent to observers

· I'll be starting this at 01:45 UT and will extend Kamil's run to 09:40 UT.
Don [2015-03-25 00:24, Sugarloaf]

· Observing this one from 0 UT. Best wishes, Kamil [2015-03-24 23:45, Ondrejov] Message sent to observers

· Started a run on this at 01:50 UT.
Don [2015-03-24 01:51, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start this new target at 01:45 UT.
Don [2015-03-23 00:24, Sugarloaf]

(1914) Hartbeespoortda (Finished) [Add new note]
· This new target has been worked by Kamil Hornoch and Jan Vrastil from here and by Don Pray from Sugarloaf Mountain. It has a low amplitude of 0.04 mag, but a period of 6.33 h is detected (U = 2).
http://www.asu.cas.cz/~asteroid/01914.png
http://www.asu.cas.cz/~asteroid/01914_nsp.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-03-24 15:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 02:40 UT.
Don [2015-03-24 01:53, Sugarloaf] Message sent to observers

· I'm planning a run on this 02:45 UT.
Don [2015-03-23 00:22, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed last night for 3.2 hours. Best wishes, Kamil and Honza [2015-03-21 08:50, Ondrejov] Message sent to observers

· Started at 1:45 UT and got 2.3h run. Best wishes, Kamil and Honza [2015-03-20 04:03, Ondrejov]

· I plan to start this new target at 03:00 UT.
Don [2015-03-20 01:36, Sugarloaf] Message sent to BinAstPhotSurvey conference

(141527) 2002 FG7 (Finished) [Add new note]
· Hi Everyone,

I have observed this NEA for 2 nights last week during its closest approach. Petr found it to have a large amplitude 1.07mag and a period of 6.31h. From the multiple sessions, I suspect that it may be tumbling but my internal linkages may not be correct. We need more data for its determination. The evolution of the light curve may prove to be even more interesting. Any help will be very useful.

Julian [2015-03-24 08:50, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(6027) 1993 SS2 (Finished) - flat lightcurve [Add new note]
· Observations from a few stations showed a flat lightcurve on a few nights with good conditions. Two accurately linked sessions taken by Kamil Hornoch and Jan Vrastil from here on 2015-03-19.0 and 20.0 have shown no brightness difference greater than 0.02 mag between the two nights:
http://www.asu.cas.cz/~asteroid/06027.png
This appears to be a low amplitude or maybe a very long period object. We are closing it as unsuccessfull period detection (U = 0),
http://www.asu.cas.cz/~ppravec/newres.htm

Best wishes, Petr [2015-03-23 07:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night as complementary target. Best wishes, Kamil and Honza [2015-03-21 08:48, Ondrejov] Message sent to observers

· Observed this one as complementary target. Best wishes, Kamil and Honza [2015-03-20 04:04, Ondrejov]

· Planning to start this at 01:50 UT.
Don [2015-03-20 01:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be starting this one at 02:00 UT.
Don [2015-03-19 00:32, Sugarloaf]

· Plan to start this new target at 02:25 UT.
Don [2015-03-13 01:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5181) SURF (Finished) [Add new note]
· Another new target done by Don Pray from Sugarloaf Mountain: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/05181.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-03-20 07:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm planning to start this at 01:30 UT. A good run could finish this one.

Don [2015-03-19 00:30, Sugarloaf]

· I plan to start this one at 02:00 UT.
Don [2015-03-13 00:56, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I did a run on this new target on Mar 10, and will be doing another run tonight starting at 02:25 UT.
Don [2015-03-12 00:06, Sugarloaf]

(3105) Stumpff (Finished) [Add new note]
· This return prime suspect has been done sufficiently by Don Pray from Sugarloaf Mountain and by Hana Kucakova and Kamil Hornoch from here:
http://www.asu.cas.cz/~asteroid/03105_b5.png
Done for this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-03-18 14:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 02:30 UT.
Don [2015-03-13 00:58, Sugarloaf]

· Have three runs on this worked object from current target list. Prompt Tololo on 56623 from 0320-0830 UT, Prompt Siding Spring on 56623 from 1250-1730 UT and Perth 56624 1500-1820 UT. Joe [2013-12-06 01:48, Dark Sky & PROMPT] Message sent to observers

· Well done by Julian from Leura on 8 nights, supported with one session from Modra. Unique period, good coverage, no indication of binarity seen. (Some features seem to be an evolution of the lightcurve.) A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Julian.

Cheers, Petr [2006-12-01 09:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· A few more nights taken 24/11(1hr), 25/11 (7.5h), 28/11( 7.5h). No changes to the period but amplitude is shifting to 0.40mag+/- 0.05mag . Data sent in. [2006-11-29 03:32, Blue Mountains Obs]

· Bad weather has hampered the work on this target. For the past 3 weeks, 4 runs were completed. 01/11 UT (6hrs), 13/11 UT (2hrs), 17/11UT (6.5hrs) and 18/11 UT (7hrs). I am still gathering more data with the intention of confirming the presence of irregular pattern on one of its minima. Period is now refined to 5.0372 +/- 0.0001h and period 0.35mag+/- 0.05 mag [2006-11-19 11:25, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed til 16:27UT 31/10. Easy target with amplitude 0.35mag+/-0.03mag. Initial period is 5.09h+/-0.04h. [2006-11-01 01:39, Blue Mountains Obs]

· Started on a new target at 11:26 UT 31/10. Planing for a full session. Condition is very good.
Julian [2006-10-31 12:13, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5334) Mishima (Finished) [Add new note]
· Another new target done by Don Pray from Sugarloaf Mountain: Good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/05334.png
Closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-03-12 14:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 01:15 UT and should finish it.
Don [2015-03-12 00:01, Sugarloaf]

· I started a run on this at 01:25 UT. Looks like a period around 3h.
Don [2015-03-10 02:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target last night, Mar. 1 UT.
Don [2015-03-01 21:21, Sugarloaf]

(16831) 1997 WM21 (Finished) - suspect deviations seen, but unexplained [Add new note]
· This target is closed now: Suspect deviations seen, but unexplained.
http://www.asu.cas.cz/~asteroid/16831.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-03-11 16:46, Ondrejov]

· observed from 15:22 UT 02/16 for 2 hours after the sky cleared. [2015-02-17 01:28, Blue Mountains Obs] Message sent to observers

· Observed on Feb. 11-12, 19:30 - 01:00 UT at the Sopot AO.
Vladimir [2015-02-12 14:36, Sopot AO]

· observed on 01/29 and 01/30. [2015-02-01 11:39, Blue Mountains Obs] Message sent to observers

· Started a run at 01:00 UT.
Don [2015-01-23 02:09, Sugarloaf]

· Don Pray has taken five sessions for this new targets, with durations 2.3-6.8 hours. There are a few possible periods. Since some of them are near commensurate with the Earth's rotation, he needs a help from other stations at substantially different longitudes. One possible solution:
http://www.asu.cas.cz/~asteroid/16831.png

Clear Skies, Petr [2015-01-17 06:26, Ondrejov]

· I started a run at 01:20 UT.
Don [2015-01-17 01:50, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start this one at 01:20 UT.
Don [2015-01-16 00:49, Sugarloaf]

· Started this at 02:50 UT.
Don [2015-01-02 02:48, Sugarloaf]

· I plan to start this at 03:00 UT.
Don [2015-01-01 01:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run on this at 03:00 UT.
Don [2014-12-31 03:03, Sugarloaf]

· Started a run on this at 03:00 UT.
Don [2014-12-31 03:03, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'm planning to start this at 06:00, Dec 30 UT.
Don [2014-12-29 22:54, Sugarloaf]

· Plan to start this new target at 07:00 UT after other targets are complete for this scope.
Don [2014-12-26 23:30, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1217) Maximiliana (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/01217.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2015-03-11 08:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this at 02:15 UT.
Don [2015-03-10 02:11, Sugarloaf]

· Planning to start this at 02:50 UT.
Don [2015-03-01 01:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started this at 02:50 UT.
Don [2015-02-28 03:01, Sugarloaf]

· I started this new target on Feb 26 in partly cloudy conditions, so only got a short run. It seems to be a fairly fast rotator.
Don [2015-02-26 22:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4364) Shkodrov (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain, Julian Oey from Leura and Vladimir Benishek from Sopot: Unique period, sufficient coverage, no significant deviations (other than attributable to lightcurve changes with solar phase),
http://www.asu.cas.cz/~asteroid/04364.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Petr [2015-03-04 09:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 23:45, Feb 27 UT.
Don [2015-02-27 23:53, Sugarloaf] Message sent to observers

· Don Pray has obtained five nights for this new target. The following solution is U = 2+ or 3-,
http://www.asu.cas.cz/~asteroid/04364.png
One or two runs from another station at substantially different longitude would be useful to nail down it.

Clear Skies, Petr [2015-01-30 09:28, Ondrejov] Message sent to observers

· I corrected the name ;-). Petr S. [2015-01-19 11:07, Ondrejov]

· Plan to start this at 03:30 UT. Note that the name is "Shkodrov".
Don [2015-01-17 01:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start this new target at 04:00 UT.
Don [2015-01-16 03:04, Sugarloaf]

(19695) 1999 RP234 (Finished) [Add new note]
· This new target has been done by Kamil Hornoch from here, by Vladimir Benishek from Sopot, and by Don Pray from Sugarloaf Mountain: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/19695.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good, fast work guys.

Cheers, Petr [2015-02-23 06:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will start this one from 1 UT in uncertain weather conditions. Best wishes, Kamil [2015-02-23 00:52, Ondrejov] Message sent to observers

· I started this target at 19:50UT. Nelya. [2015-02-21 20:13, Simeiz]

· Observed this target over slightly more than 3.5 hours last night. Unfortunately I had to quit due to the sudden overcast.
Vladimir [2015-02-21 13:10, Sopot AO] Message sent to observers

· I'm planning to start this at 03:00 UT and should extend Vladimir's run.
Don [2015-02-20 23:43, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started to observe this target at 19:59 UT from Sopot.
Vladimir [2015-02-20 20:12, Sopot AO] Message sent to observers

· Kamil Hornoch has taken 2.8 hours worth of data for this new target from here on the past night. Covered a lightcurve minimum (or, it may be a binary mutual event),
http://www.asu.cas.cz/~asteroid/19695.png
In any case, we would appreciate if someone could take over this target now --- there is another observing program scheduled at the 0.65-m here for the next two nights ....

Clear Skies, Petr [2015-02-20 11:53, Ondrejov] Message sent to BinAstPhotSurvey conference

(8116) Jeanperrin (Finished) - return binary [Add new note]
· Done for the 3rd apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Good work Don!
Petr [2015-02-22 15:36, Ondrejov]

· Making a last attempt to get the primary lc on this very dim target.
Don [2015-02-20 23:39, Sugarloaf] Message sent to observers

· Started this in breezy conditions to get the primary LC.
Don [2015-02-11 00:00, Sugarloaf]

· Started this at 00:35 UT and will hopefully catch the 0.748 event.
Don [2015-01-23 00:38, Sugarloaf] Message sent to observers

· Started a run at 23:30, Jan 13 UT to catch the 0.748 phase event.
Don [2015-01-13 23:29, Sugarloaf]

· Good effort by Don Pray from Sugarloaf Mountain on this return binary (3rd apparition), supported with one night by Kamil Hornoch and Jan Vrastil from here:
http://www.asu.cas.cz/~asteroid/08116_2014a_porb.png
http://www.asu.cas.cz/~asteroid/08116_2014a_p1.png
http://www.asu.cas.cz/~asteroid/08116_2014b_porb.png
http://www.asu.cas.cz/~asteroid/08116_2014b_p1.png

More data would be still useful, with errors <= 0.03 mag; don't bother in less ideal conditions. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1- 8 19.90 0.245
2015- 1-10 8.02 0.245
2015- 1-11 20.14 0.245
2015- 1-13 8.26 0.245
2015- 1-14 20.38 0.245
2015- 1-16 8.50 0.245
2015- 1-17 20.62 0.245
2015- 1-19 8.74 0.245
2015- 1-20 20.86 0.245
2015- 1-22 8.98 0.245
2015- 1-23 21.10 0.245
2015- 1-25 9.22 0.245
2015- 1-26 21.34 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1- 8 1.93 0.748
2015- 1- 9 14.05 0.748
2015- 1-11 2.17 0.748
2015- 1-12 14.29 0.748
2015- 1-14 2.41 0.748
2015- 1-15 14.53 0.748
2015- 1-17 2.65 0.748
2015- 1-18 14.77 0.748
2015- 1-20 2.89 0.748
2015- 1-21 15.01 0.748
2015- 1-23 3.13 0.748
2015- 1-24 15.25 0.748
2015- 1-26 3.37 0.748

Clear Skies, Petr [2015-01-07 10:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a at 22:40, Dec 29 UT, and hope to catch the 0.743 phase event.
Don [2014-12-29 22:52, Sugarloaf] Message sent to observers

· Observation started at 20:45 UT. Gabo [2014-12-27 20:50, SkalnatePleso] [Remove]

· I started this along with 7225 at 23:15 UT, and hope to catch the 0.743 phase event.
Don [2014-12-26 23:18, Sugarloaf] Message sent to observers

· I started this at 23:20, Dec 13 UT, and should catch the 0.244 phase event.
Don [2014-12-14 01:20, Sugarloaf]

· Good effort by Don Pray from Sugarloaf Mountain on this one:
http://www.asu.cas.cz/~asteroid/08116_2014_porb.png
http://www.asu.cas.cz/~asteroid/08116_2014_p1.png

More data (errors <= 0.03 mag) are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-12- 9 17.65 0.244
2014-12-11 5.78 0.244
2014-12-12 17.91 0.244
2014-12-14 6.04 0.244
2014-12-15 18.17 0.244
2014-12-17 6.30 0.244
2014-12-18 18.43 0.244
2014-12-20 6.56 0.244
2014-12-21 18.69 0.244
2014-12-23 6.82 0.244
2014-12-24 18.95 0.244
2014-12-26 7.08 0.244
2014-12-27 19.21 0.244
2014-12-29 7.34 0.244

Date/Time UTC (LTc.) Phase
--------------------------
2014-12-10 11.66 0.743
2014-12-11 23.79 0.743
2014-12-13 11.92 0.743
2014-12-15 0.05 0.743
2014-12-16 12.18 0.743
2014-12-18 0.31 0.743
2014-12-19 12.44 0.743
2014-12-21 0.57 0.743
2014-12-22 12.70 0.743
2014-12-24 0.83 0.743
2014-12-25 12.96 0.743
2014-12-27 1.09 0.743
2014-12-28 13.22 0.743
2014-12-30 1.35 0.743

Clear Skies, Petr [2014-12-03 15:23, Ondrejov]

· Observing from 21:30 UT. Gabo [2014-12-02 21:36, SkalnatePleso] [Remove]
Message sent to observers

· Started a run at 01:00 UT.
Don [2014-11-22 00:59, Sugarloaf]

· I started this at 01:10 UT and will record (mostly) the LC outside of event.
Don [2014-11-19 02:39, Sugarloaf] Message sent to observers

· Started a run at 1:10 UT.
Don [2014-11-13 02:11, Sugarloaf]

· Don Pray has taken the first night for this return binary in its current apparition, captured an event:
http://www.asu.cas.cz/~asteroid/08116_2014_porb.png
http://www.asu.cas.cz/~asteroid/08116_2014_p1.png

More data is needed for both events as well as for the primary lc component; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-12 15.59 0.252
2014-11-14 3.72 0.252
2014-11-15 15.85 0.252
2014-11-17 3.98 0.252
2014-11-18 16.11 0.252
2014-11-20 4.24 0.252
2014-11-21 16.37 0.252
2014-11-23 4.50 0.252
2014-11-24 16.63 0.252
2014-11-26 4.76 0.252
2014-11-27 16.89 0.252
2014-11-29 5.02 0.252
2014-11-30 17.15 0.252
2014-12- 2 5.28 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-13 9.64 0.752
2014-11-14 21.77 0.752
2014-11-16 9.90 0.752
2014-11-17 22.03 0.752
2014-11-19 10.16 0.752
2014-11-20 22.29 0.752
2014-11-22 10.42 0.752
2014-11-23 22.55 0.752
2014-11-25 10.68 0.752
2014-11-26 22.81 0.752
2014-11-28 10.94 0.752
2014-11-29 23.07 0.752
2014-12- 1 11.20 0.752
2014-12- 2 23.33 0.752

Clear Skies, Petr [2014-11-12 08:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:55 UT.
Don [2014-11-11 02:49, Sugarloaf]

· Done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

A third apparition will be needed for modeling.

Petr [2012-03-21 09:21, Ondrejov]

· Good data taken by Peter Kusnirak and Kamil Hornoch from here, by Marek Husarik and Michal Pikler from Skalnate Pleso, by Joe Pollock from NC, and by Fred Vachier from Pic du Midi in its current (first return) apparition so far:
http://www.asu.cas.cz/~asteroid/08116_12_porb.png

Taking last data (errors 0.02 mag) for this apparition after the moon is out of the way later in this month would be useful for future modeling; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-11 21.72 0.249
2012- 3-13 9.83 0.249
2012- 3-14 21.94 0.249
2012- 3-16 10.05 0.249
2012- 3-17 22.16 0.249
2012- 3-19 10.27 0.249
2012- 3-20 22.38 0.249
2012- 3-22 10.49 0.249
2012- 3-23 22.60 0.249
2012- 3-25 10.71 0.249
2012- 3-26 22.82 0.249
2012- 3-28 10.93 0.249
2012- 3-29 23.04 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-12 16.07 0.758
2012- 3-14 4.18 0.758
2012- 3-15 16.29 0.758
2012- 3-17 4.40 0.758
2012- 3-18 16.51 0.758
2012- 3-20 4.62 0.758
2012- 3-21 16.73 0.758
2012- 3-23 4.84 0.758
2012- 3-24 16.95 0.758
2012- 3-26 5.06 0.758
2012- 3-27 17.17 0.758
2012- 3-29 5.28 0.758

Clear Skies, Petr [2012-03-05 13:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 17:57 UT + (14627) as complementary target under good conditions, but clouds could come in a few hours... Best wishes, Kamil [2012-02-22 18:11, Ondrejov] Message sent to observers

· About to begin observations to get phase 0.770 event at 0238 UT from NC. Very good conditions. Joe [2012-02-12 23:50, Dark Sky & PROMPT]

· Good data, the first two and half nights taken for this return binary by Marek Husarik and Michal Pikler from Skalnate Pleso and by Peter Kusnirak from here in its current 2nd apparition:
http://www.asu.cas.cz/~asteroid/08116_12_porb.png
http://www.asu.cas.cz/~asteroid/08116_12_p1.png
Cf. with the data from the 2007 discovery apparition:
http://www.asu.cas.cz/~asteroid/08116_porb.png
http://www.asu.cas.cz/~asteroid/08116_p1.png

More data with a similar quality (errors of 0.02 mag, i.e., requiring good to high-quality sky conditions) for both events would be useful for future modeling; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 3 7.14 0.256
2012- 2-12 8.04 0.256
2012- 2-13 20.19 0.256
2012- 2-15 8.34 0.256
2012- 2-16 20.49 0.256
2012- 2-18 8.64 0.256
2012- 2-19 20.79 0.256
2012- 2-21 8.94 0.256
2012- 2-22 21.09 0.256
2012- 2-24 9.24 0.256
2012- 2-25 21.39 0.256
2012- 2-27 9.54 0.256
2012- 2-28 21.69 0.256
2012- 3- 1 9.84 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 2 13.58 0.770
2012- 2- 4 1.73 0.770
2012- 2-11 14.48 0.770
2012- 2-13 2.63 0.770
2012- 2-14 14.78 0.770
2012- 2-16 2.93 0.770
2012- 2-17 15.08 0.770
2012- 2-19 3.23 0.770
2012- 2-20 15.38 0.770
2012- 2-22 3.53 0.770
2012- 2-23 15.68 0.770
2012- 2-25 3.83 0.770
2012- 2-26 15.98 0.770
2012- 2-28 4.13 0.770
2012- 2-29 16.28 0.770
2012- 3- 2 4.43 0.770

Clear Skies, Petr [2012-02-02 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 17:40 UT tonight under excellent conditions. Peter K. [2012-02-01 20:27, Ondrejov] Message sent to observers

· Observing from 17:25 UT in a good conditions. Michal [2012-01-31 17:29, SkalnatePleso] [Remove]

· Observing from 17:30 UT in a relatively good conditions. Michal [2012-01-30 22:04, SkalnatePleso] [Remove]
Message sent to observers

· Follow up observations would be useful, from stations that can work it at V~17 with errors <0.03 mag. Ephemeris for events:

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-29 2.40 0.255
2007-11-30 14.55 0.255
2007-12- 2 2.70 0.255
2007-12- 3 14.85 0.255
2007-12- 5 3.00 0.255
2007-12- 6 15.15 0.255
2007-12- 8 3.30 0.255
2007-12- 9 15.45 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-28 8.13 0.750
2007-11-29 20.28 0.750
2007-12- 1 8.43 0.750
2007-12- 2 20.58 0.750
2007-12- 4 8.73 0.750
2007-12- 5 20.88 0.750
2007-12- 7 9.03 0.750
2007-12- 8 21.18 0.750
2007-12-10 9.33 0.750

Clear Skies, Petr [2007-11-22 14:49, Ondrejov]

· Yura Krugly has measured following color indices on Oct. 18.8:
B-R = 1.32 ±0.03
V-R = 0.475 ±0.02
R-I = 0.395 ±0.02
As he notes, they are close to the mean color indices for S-type asteroids.

Calibrated R data by Peter and Kamil from Onrejov on two nights Oct. 14.0 and Nov. 5.8 give H_R = 13.57 and G = 0.23 with formal uncertainties +/-0.04 and 0.06, respectively. With the V-R estimate by Yura, we get H=H_V= 14.05 +/- 0.05. (Yura has got a very close H estimate from his data alone, so there is a nice consistency in calibrations from the two stations.)

Cheers, Petr [2007-11-12 14:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement has just appeared, enclosed below for your convenience. (I apologize to Francois for forgotting to put "IMCCE" in his affiliation.) I am going to update our web pages accordingly.

Cheers, Petr

(8116) JEANPERRIN
D. Higgins, Canberra, Australia; P. Pravec, P. Kusnirak, and K.
Hornoch, Ondrejov Observatory; M. Husarik, M. Pikler, and G. Cervak,
Skalnate Pleso Observatory; D. Pray, Carbuncle Hill Observatory, Greene,
RI; S. Gajdos, Modra Observatory; Yu. Krugly, Institute of Astronomy,
Kharkiv National University, National Academy of Science of Ukraine;
A. Marshalkina, Ulugh Beg Astronomical Institute, Uzbek Academy of
Sciences; R. Stephens, Goat Mountain Astronomical Research Station, Yucca
Valley, CA; F. Colas, Pic du Midi Observatory; and W. Cooney, J. Gross,
and D. Terrell, Sonoita Research Observatory, Sonoita, AZ, report that
photometric observations obtained during Oct. 4-Nov. 7 reveal that minor
planet (8116) is a binary system with an orbital period of 36.15 ± 0.02
hr. The primary shows a period of 3.6169 ± 0.0002 hr, and it has a
lightcurve amplitude of 0.09 mag, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.33. Calibrated data give
an estimated mean absolute magnitude H_R = 13.52 ± 0.13, assuming
G = 0.15 ± 0.2.

(C) Copyright 2007 CBAT
2007 November 9 (CBET 1127) Daniel W. E. Green [2007-11-09 15:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data by Walt, John and Dirk from SRO of Nov. 7.2 have completed coverage of the secondary event. The event's bottom is not entirely flat, so it may not be quite total and we get a lower limit for D_2/D_1 (though it is likely actually not much greater).
P_1 = 3.6169 +/- 0.0002 h
P_orb = 36.15 +/- 0.02 h
Depth of events: 0.08-0.18 mag
D_2/D_1 >= 0.33
H_R = 13.52 +/- 0.13, assuming G = 0.15 +/- 0.2.
http://www.asu.cas.cz/~asteroid/08116_all.png
http://www.asu.cas.cz/~asteroid/08116_porb.png
http://www.asu.cas.cz/~asteroid/08116_p1.png
So, we are going to announce it on CBET. I see a message from Francois of Nov. 5 that he was observing it on the evening; Francois, if you reduce the observations today or tomorrow, I will be glad to include it into the analysis before we submit our announcement.

Cheers, Petr [2007-11-08 09:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will work from SRO tonight to help get coverage of the .75 event.

-Walt [2007-11-07 00:47, Sonoita]

· Gabo&Marek and Kamil&Peter have taken good data from Skalnate Pleso and Ondrejov, respectively, on the past night. They have covered about 2/3 of the 0.75-phase event:
http://www.asu.cas.cz/~asteroid/08116_porb.png
The full event can be covered from US stations on Nov. 7, 10, 13, and 16, or from Kharkiv/Simeiz on Nov. 8, 11, 14, and 17 (with the asteroid gradually fading, sooner is better, of course).

Clear Skies, Petr [2007-11-06 09:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object observed from 17:38 UT to 23:56 UT, November 5. Gabo [2007-11-06 01:21, SkalnatePleso] [Remove]
Message sent to observers

· We started on (8116) jean Perrin at 17h50 UT here at Pic du midi so mere or less just at the middle of the 0.75 event.

Francois [2007-11-05 18:19, Pic du Midi] Message sent to BinAstPhotSurvey conference

· Dear colleagues, I am observing this one and will be so long as coming clouds permit... Best wishes, Kamil [2007-11-05 18:10, Ondrejov] Message sent to observers

· New data joined in:
2007-10-29.9 by Michal and Marek from S. Pleso
2007-11-02.0 by Francois from PdM.
While Michal and Marek covered a beginning of the 0.25-phase event, Francois has covered it in full:
http://www.asu.cas.cz/~asteroid/08116_porb.png
The event has broadened and it has a characteristic structure for a primary event produced by a combination of eclipse and occultation at current solar phase. We will see how the 0.75-phase event (assumed secondary) looks now and whether we will be able to nail down D_2/D_1. Ephemeris below; the event gradually moves into the window for CZ/SK stations (on Nov. 5, 8, 11, .... evening), but it is best placed for US stations on Nov. 7, 10, 13, .... around 6 UT currently.

Date/Time UTC (LTc.) Phase
--------------------------
2007-11- 5 17.88 0.750
2007-11- 7 6.03 0.750
2007-11- 8 18.18 0.750
2007-11-10 6.33 0.750
2007-11-11 18.48 0.750
2007-11-13 6.63 0.750

Date/Time UTC (LTc.) Phase
--------------------------
2007-11- 6 11.97 0.250
2007-11- 8 0.12 0.250
2007-11- 9 12.27 0.250
2007-11-11 0.42 0.250
2007-11-12 12.57 0.250

Cheers, Petr [2007-11-05 09:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 23:15 UT in average conditions. Michal [2007-11-01 23:20, SkalnatePleso] [Remove]
Message sent to observers

· One more good coverage for each of the two events is still needed to confirm recent evolution of the events, before we announce this one. Ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2007-11- 1 23.50 0.258
2007-11- 3 11.63 0.258
2007-11- 4 23.76 0.258
2007-11- 6 11.89 0.258
2007-11- 8 0.02 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2007-11- 2 17.26 0.750
2007-11- 4 5.39 0.750
2007-11- 5 17.52 0.750
2007-11- 7 5.65 0.750
2007-11- 8 17.78 0.750

Clear Skies, Petr [2007-11-01 15:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Session started at 19:10 UT in good conditions. Plan to finish after 23:00 UT if weather permit. Michal [2007-10-29 19:32, SkalnatePleso] [Remove]
Message sent to observers

· Forgot to put the URL to updated plot:
http://www.asu.cas.cz/~asteroid/08116_porb.png

Petr [2007-10-22 09:24, Ondrejov]

· Two new sessions joined in:
2007-10-19.5 by David from Hunters Hill
2007-10-20.2 by Bob from GMARS
Both sessions indicate that the events are evolving. David's data covering the primary event suggest that the event has narrowed and its depth slightly decreased; it is consistent with an expected evolution at the asteroid's current geometry, unless it continues much more during following days (would be good to take a bit denser data, as the event is pretty steep and fast so a less dense coverage like the latest data don't describe the event entirely well). Bob's data suggest that the secondary event is less deep than it was just three days ago. Well, Bob has reported a bad seeing in the first part of the night (right the critical data in the event), so a confirmation (of both the secondary and primary event evolution) with another session after the full moon will be needed. Nevetheless, as it looks from the available data now, the geometry is moving away from the orbital plane, so we will not be able to get a precise estimate for D_2/D_1 in this apparition. So, after the evolution is confirmed after the full moon, we will announce this binary on a circular right away.

Clear Skies, Petr [2007-10-22 09:20, Ondrejov] Message sent to observers

· Started observing 2007-10-20 at 03:00 UT from GMARS. [2007-10-20 04:27, Santana]

· Observed 2007-10-19 from 09:20UT to 16:40UT in good conditions till cloud terminated the session. I believe I caught part of an event. [2007-10-20 03:16, HuntersHill] Message sent to observers

· Yura has covered a part of the secondary event on Oct. 18.8,
http://www.asu.cas.cz/~asteroid/08116_porb.png
They contribute to the solution, but more data for the event are needed.

Clear Skies, Petr [2007-10-19 09:33, Ondrejov] Message sent to observers

· The asteroid was observed from 16:30 up to 20:30.
Yura [2007-10-18 23:38, Kharkiv]

· Don has covered most of the secondary event on Oct. 17.1,
http://www.asu.cas.cz/~asteroid/08116_porb.png
The two sessions covering the secondary event, Oct. 15.6 by David and Oct. 17.1 by Don, show that it doesn't have a flat bottom. This indicates a non-central geometry, thus we have estimated only a lower limit on D_2/D_1 from the available data. Before we announce the new binary on a circular, it would be good to check whether the geometry moves towards more central one that would allow us to establish the size ratio more precisely. Monitoring an evolution of the events (in good conditions only; don't bother, e.g., when the Moon is too close) is therefore needed. An ephemeris for the secondary events is below. I put there also an ephemeris for the primary events, which are not so critical, but would be interesting to observe too, to refine P_orb and get data for future modeling of the system.

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-18 16.08 0.750
2007-10-20 4.23 0.750
2007-10-21 16.38 0.750

2007-10-27 16.98 0.750
2007-10-29 5.13 0.750
2007-10-30 17.28 0.750
2007-11- 1 5.43 0.750

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-19 10.42 0.257
2007-10-20 22.57 0.257
2007-10-22 10.72 0.257

2007-10-28 11.32 0.257
2007-10-29 23.47 0.257
2007-10-31 11.62 0.257

Clear Skies, Petr [2007-10-18 08:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at about 00:50 to catch the 0.75 phase event at 3.93UT.
Don [2007-10-16 23:46, CarbuncleHill] Message sent to observers

· A lot of great data taken during the past few days:
2007-10-13.2 by Don from Carbuncle Hill
2007-10-13.6, 14.6 and 15.6 by David from Hunters Hill
2007-10-14.0 by Peter and Kamil from here
2007-10-14.9 and 16.0 by Michal and Marek from S. Pleso
2007-10-14.9 and 15.9 by Stefan from Modra.
David's data of Oct. 15.6 have resolved the ambiguity of 36.15 vs 72.3 h. Current solution:
P_1 = 3.6170 +/- 0.0002 h
P_orb = 36.15 +/- 0.02 h
Depth of events: 0.11-0.19 mag
D_2/D_1 = 0.33 (extremely sensitive to a quality of one night Oct. 15.6).
http://www.asu.cas.cz/~asteroid/08116_all.png
http://www.asu.cas.cz/~asteroid/08116_porb.png
http://www.asu.cas.cz/~asteroid/08116_porb_contacts.png
http://www.asu.cas.cz/~asteroid/08116_p1.png
The primary event has been covered well, no more data are needed for it now. The secondary event needs to be covered more with a good quality data to estimate D_2/D_1 precisely. It is likely that after one or two more good sessions for the secondary events, this one will be ready to be published on a circular. Ephemeris for the secondary events:

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-17 3.93 0.750
2007-10-18 16.08 0.750
2007-10-20 4.23 0.750
2007-10-21 16.38 0.750

Cheers, Petr [2007-10-16 09:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-15 from 09:15UT to 17:24UT in poor conditions (20-40kph winds). I either caught another event or my data is so noisy it needs to be tossed (images from second half of the night smeared by wind vibration) [2007-10-15 21:56, HuntersHill] Message sent to observers

· Started at 19:30 UT on Oct.15, 2007.

Stefan [2007-10-15 19:36, Modra] Message sent to BinAstPhotSurvey conference

· I plan this target tonight with start at 19:30 UT, again.

Stefan [2007-10-15 17:41, Modra]

· Observed 2007-10-14 from 09:51UT to 17:27UT in poor conditions (very windy affecting star image quality). No significant deviations noted in the data. [2007-10-14 22:05, HuntersHill] Message sent to observers

· Observing from 20:30 UT in good conditions. Michal [2007-10-14 20:33, SkalnatePleso] [Remove]

· I plan this target tonight with start at 19:30 UT.

Stefan [2007-10-14 17:40, Modra] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-13 from 09:14UT to 17:34UT in reasonable conditions. I believe I cause the last 2/3rds of an event at the start of the night. Data sent to Petr. [2007-10-14 02:34, HuntersHill] Message sent to observers

· Gabo and Marek captured another 0.18-mag deep event from S. Pleso on Oct. 11.9. A likely (but not unique yet) orbital period is 72.3 hours.
http://www.asu.cas.cz/~asteroid/08116_all.png
http://www.asu.cas.cz/~asteroid/08116_porb.png
http://www.asu.cas.cz/~asteroid/08116_p1.png

More data (at any orbital phase) are needed to establish the solution well.

Cheers, Petr [2007-10-12 08:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object observed from 19:50 UT to 00:05 UT, October 11/12. Gabo [2007-10-12 00:07, SkalnatePleso] [Remove]
Message sent to observers

· Three good long sessions taken by David Higgins from 2007 Oct. 4.6 to 8.6 have reasonably established a period of 3.616 h. His first night showed a marginal attenuation by 0.05 mag in a few first points. Additional data taken by Michal and Marek from S. Pleso on Oct. 8.9 have shown what appears to be an event with a depth of at least 0.17 mag (it may be deeper if a couple last points of their short session were still in the event). Possible orbital periods are longer than 30 hours. (Below I give a plot of the data with one candidate period.)
http://www.asu.cas.cz/~asteroid/08116_p1.png
http://www.asu.cas.cz/~asteroid/08116_porb.png

More observations are needed to capture more events and establish its orbital period.

Cheers, Petr [2007-10-10 09:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-08 from 10:00UT to 17:27UT in good conditions. Data refines period to 3.616 +/- 0.002hrs with an amplitude of 0.09 +/- 0.02mag. Data sent to Petr. [2007-10-08 22:01, HuntersHill] Message sent to observers

· Observing from 21:35 UT in relatively good conditions. Session terminated at 23:20 UT due to bad weather.Michal [2007-10-08 23:33, SkalnatePleso] [Remove]

· David Higgins has found a probable period of 3.60 h (U=2+ or 3-). The lightcurve has a low amplitude and possibly a bit unsmooth shape, so taking one session with errors 0.01 mag or better would be useful. I encourage some of you who can take such data to help out.
http://www.david-higgins.com/Astronomy/asteroid/images/8116LC.gif

Cheers, Petr [2007-10-08 08:10, Ondrejov]

· Observed 2007-10-05 from 0954UT to 15:46UT in poor conditions due to strong wind, haze and session terminated early due to cloud. Data refines period to 3.601 +/0 0.008hrs with amplitude of 0.1 +/- 0.02mag. No large deviations noted though the data is fairly noisy. [2007-10-06 03:47, HuntersHill] Message sent to observers

· Observed 2007-10-04 from 10:05UT to 18:15UT in reasonable conditions. Another low amplitude target. Data reveals a somewhat noise period fit at 3.62 +/- 0.06hrs with an amplitude 0.1 +/- 0.01mag. [2007-10-04 23:16, HuntersHill] Message sent to BinAstPhotSurvey conference

(357439) 2004 BL86 (Finished) - NEA binary [Add new note]
· Albino Carbognani has observed this binary on three recent nights 2015-02-09.9 to 12.0, but they don't fit with the orbital period of 13.8 h that we published on CBET 4063 based on the pre-flyby data of 2015-01-20 to 24. Now I have looked in detail at the post-flyby data 2015-01-28.9 to 02-12.0 and they can be fitted with a longer orbital period around 16.8 h. Anyway, confirmation is needed. If you can take observations with errors < 0.03 mag for this rapidly fading binary tonight or on following nights, it would be useful.

Clear Skies, Petr [2015-02-12 13:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by Paolo Bacci from San Marcello Pistoiese and by Don Pray from Sugarloaf Mountain were taken on 2015-01-28.9 to 29.2. This solution is still a bit tentative (a complication comes from that they are short sessions and they have not been accurately linked):
http://www.asu.cas.cz/~asteroid/2004bl86_2015c_porb.png
http://www.asu.cas.cz/~asteroid/2004bl86_2015c_p1.png

A tentative event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1-30 22.09 0.305
2015- 1-31 11.89 0.305
2015- 2- 1 1.69 0.305
2015- 2- 1 15.49 0.305
2015- 2- 2 5.29 0.305
2015- 2- 2 19.09 0.305

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1-30 14.49 0.755
2015- 1-31 4.29 0.755
2015- 1-31 18.09 0.755
2015- 2- 1 7.89 0.755
2015- 2- 1 21.69 0.755
2015- 2- 2 11.49 0.755

But don't take it very seriously. Observations outside events are needed anyway; take runs at least 4 hours long so that your data can be precisely disentangled.

Clear Skies, Petr [2015-01-30 09:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our report on this binary has appeared on CBET 4063, copied below for your convenience.

Cheers, Petr

(357439) 2004 BL_86
J. Pollock, Appalachian State University; P. Pravec, Ondrejov
Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW; and D. E.
Reichart, J. B. Haislip and A. P. LaCluyze, University of North Carolina,
Chapel Hill, report that photometric observations obtained during 2015
Jan. 20-24 reveal that minor planet (357439) is a binary system with
an orbital period of 13.80 ± 0.05 hr. The primary shows a period of
2.6205 ± 0.0003 hr, and it has a lightcurve amplitude of 0.17 mag at
solar phases 99-109 deg, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.05- to 0.07-magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.21 ± 0.02.
Minor planet 2004 BL_86 was discovered eleven years ago by the LINEAR
program (cf. MPEC 2004-B80) and was later numbered (357439).

Lance A. M. Benner, on behalf of the radar team reports that Goldstone
delay-Doppler radar (8560-MHz, 3.5-cm, 3.75-m resolution) images obtained on
2015 Jan. 26 confirm that (357439) is a binary system. Preliminary
estimates for diameters of the components are 300 m for the primary and
50-100 m for the secondary.
Forty-four minor planets passing close to the earth have now been found
to have companions via radar (eight of those discovered first via optical
photometry), and at least two such minor planets have more than one companion.

2015 January 30 (CBET 4063) Daniel W. E. Green [2015-01-30 08:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:20 UT, and should be able to follow it the entire night.
Don [2015-01-29 00:34, Sugarloaf]

· A tentative event ephemeris is below. But don't count on it much. (And, after all, a good coverage outside events is necessary as well.)

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1-28 14.29 0.262
2015- 1-29 4.09 0.262
2015- 1-29 17.89 0.262
2015- 1-30 7.69 0.262
2015- 1-30 21.49 0.262
2015- 1-31 11.29 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2015- 1-28 21.04 0.751
2015- 1-29 10.84 0.751
2015- 1-30 0.64 0.751
2015- 1-30 14.44 0.751
2015- 1-31 4.24 0.751
2015- 1-31 18.04 0.751

Clear Skies, Petr [2015-01-28 09:05, Ondrejov]

· Dear Observers,

As you may be planning to observe this new NEA binary during following nights, I think that we can give you an ahead info. Below is our discovery announcement that we are going to submit to IAUC later today. Your observations during the coming days would be useful. Errors < 0.03 mag are needed (note the relatively shallow events). Also, until the asteroid slows down later this week, the primary lc will have to be defined with observations outside events on the same night so that we can disentangle the lightcurve components, so the minimum duration of a nightly run needed is 4 hours.

(357439) 2004 BL_86
J. Pollock, Appalachian State University; P. Pravec, Ondrejov
Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW; and D. E.
Reichart, J. B. Haislip and A. P. LaCluyze, University of North Carolina,
Chapel Hill; report that photometric observations obtained during 2015
Jan. 20-24 reveal that minor planet (357439) is a binary system with
an orbital period of 13.80 +/- 0.05 hr. The primary shows a period of
2.6205 +/- 0.0003 hr, and it has a lightcurve amplitude of 0.17 mag at
solar phases 99-109 deg, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.05- to 0.07-magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.21 +/- 0.02.

Clear Skies, Petr [2015-01-27 09:18, Ondrejov] Message sent to BinAstPhotSurvey conference

(1338) Duponta (Finished) - return binary [Add new note]
· Data completed. Petr [2015-02-03 15:22, Ondrejov]

· Observations finished, to be closed after adding the last two nights from PROMPT. Petr [2014-05-12 10:38, Ondrejov]

· observed on 05/01 and 05/04 covering 0.77 event. poor seeing on both days. [2014-05-05 07:12, Blue Mountains Obs] Message sent to observers

· Began run at 2315 UT from Prompt Tololo. Hope to cover phase 0.270 event centered at 0107 UT. Joe [2014-04-28 23:15, Dark Sky & PROMPT]

· observed from 09:36 but didn't complete the 0.77 phase 04/23 [2014-04-24 12:07, Blue Mountains Obs] Message sent to observers

· Began run at 2315 UT from Prompt Tololo. Hope to cover phase 0.270 event centered at 0430 UT. Joe [2014-04-22 23:40, Dark Sky & PROMPT]

· Plan to begin run at 2315 UT from Prompt Tololo. Hope to cover phase 0.770 event centered at 0209 UT. Joe [2014-04-21 22:30, Dark Sky & PROMPT] Message sent to observers

· Event ephemeris for the upcoming lunation:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-18 1.48 0.270
2014- 4-18 19.06 0.270
2014- 4-19 12.63 0.270
2014- 4-20 6.21 0.270
2014- 4-20 23.78 0.270
2014- 4-21 17.36 0.270
2014- 4-22 10.93 0.270
2014- 4-23 4.51 0.270
2014- 4-23 22.08 0.270
2014- 4-24 15.66 0.270
2014- 4-25 9.23 0.270
2014- 4-26 2.81 0.270
2014- 4-26 20.38 0.270
2014- 4-27 13.96 0.270
2014- 4-28 7.53 0.270
2014- 4-29 1.11 0.270
2014- 4-29 18.68 0.270
2014- 4-30 12.26 0.270
2014- 5- 1 5.83 0.270
2014- 5- 1 23.41 0.270
2014- 5- 2 16.98 0.270
2014- 5- 3 10.56 0.270
2014- 5- 4 4.13 0.270
2014- 5- 4 21.71 0.270
2014- 5- 5 15.28 0.270
2014- 5- 6 8.86 0.270
2014- 5- 7 2.43 0.270
2014- 5- 7 20.01 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-18 10.28 0.770
2014- 4-19 3.85 0.770
2014- 4-19 21.43 0.770
2014- 4-20 15.00 0.770
2014- 4-21 8.58 0.770
2014- 4-22 2.15 0.770
2014- 4-22 19.73 0.770
2014- 4-23 13.30 0.770
2014- 4-24 6.88 0.770
2014- 4-25 0.45 0.770
2014- 4-25 18.03 0.770
2014- 4-26 11.60 0.770
2014- 4-27 5.18 0.770
2014- 4-27 22.75 0.770
2014- 4-28 16.33 0.770
2014- 4-29 9.90 0.770
2014- 4-30 3.48 0.770
2014- 4-30 21.05 0.770
2014- 5- 1 14.63 0.770
2014- 5- 2 8.20 0.770
2014- 5- 3 1.78 0.770
2014- 5- 3 19.35 0.770
2014- 5- 4 12.93 0.770
2014- 5- 5 6.50 0.770
2014- 5- 6 0.08 0.770
2014- 5- 6 17.65 0.770
2014- 5- 7 11.23 0.770
2014- 5- 8 4.80 0.770

Clear Skies, Petr [2014-04-16 08:19, Ondrejov]

· Just began run at 0000 UT from Prompt Tololo. Hope to cover phase 0.76 event at 0204 UT. Joe [2014-03-31 00:01, Dark Sky & PROMPT] Message sent to observers

· observed from 10:21UT to 18:00UT 2014-03-21 capturing 0.76 phase event. [2014-03-22 07:16, Blue Mountains Obs]

· Joe Pollock has taken first data for this return binary in its current apparition from Perth:
http://www.asu.cas.cz/~asteroid/01338_2014_porb.png
http://www.asu.cas.cz/~asteroid/01338_2014_p1.png

More data will be useful for the system's model; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 3-21 5.28 0.276
2014- 3-21 22.84 0.276
2014- 3-22 16.40 0.276
2014- 3-23 9.96 0.276
2014- 3-24 3.52 0.276
2014- 3-24 21.08 0.276
2014- 3-25 14.64 0.276
2014- 3-26 8.20 0.276
2014- 3-27 1.76 0.276
2014- 3-27 19.32 0.276
2014- 3-28 12.88 0.276
2014- 3-29 6.44 0.276
2014- 3-29 24.00 0.276
2014- 3-30 17.56 0.276
2014- 3-31 11.12 0.276
2014- 4- 1 4.68 0.276
2014- 4- 1 22.24 0.276
2014- 4- 2 15.80 0.276
2014- 4- 3 9.36 0.276
2014- 4- 4 2.92 0.276
2014- 4- 4 20.48 0.276
2014- 4- 5 14.04 0.276
2014- 4- 6 7.60 0.276
2014- 4- 7 1.16 0.276
2014- 4- 7 18.72 0.276
2014- 4- 8 12.28 0.276
2014- 4- 9 5.84 0.276
2014- 4- 9 23.40 0.276
2014- 4-10 16.96 0.276
2014- 4-11 10.52 0.276

Date/Time UTC (LTc.) Phase
--------------------------
2014- 3-20 20.23 0.760
2014- 3-21 13.79 0.760
2014- 3-22 7.35 0.760
2014- 3-23 0.91 0.760
2014- 3-23 18.47 0.760
2014- 3-24 12.03 0.760
2014- 3-25 5.59 0.760
2014- 3-25 23.15 0.760
2014- 3-26 16.71 0.760
2014- 3-27 10.27 0.760
2014- 3-28 3.83 0.760
2014- 3-28 21.39 0.760
2014- 3-29 14.95 0.760
2014- 3-30 8.51 0.760
2014- 3-31 2.07 0.760
2014- 3-31 19.63 0.760
2014- 4- 1 13.19 0.760
2014- 4- 2 6.75 0.760
2014- 4- 3 0.31 0.760
2014- 4- 3 17.87 0.760
2014- 4- 4 11.43 0.760
2014- 4- 5 4.99 0.760
2014- 4- 5 22.55 0.760
2014- 4- 6 16.11 0.760
2014- 4- 7 9.67 0.760
2014- 4- 8 3.23 0.760
2014- 4- 8 20.79 0.760
2014- 4- 9 14.35 0.760
2014- 4-10 7.91 0.760
2014- 4-11 1.47 0.760

Clear Skies, Petr [2014-03-19 08:54, Ondrejov]

· Started run from Perth under good conditions at 1530 UT. Joe [2014-02-25 15:41, Dark Sky & PROMPT] Message sent to observers

· Done for the 3rd apparition. Petr [2012-12-21 09:58, Ondrejov]

· Last data on the events for the current apparition would be useful (errors <= 0.02 mag needed); events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-12- 2 5.62 0.273
2012-12- 2 23.18 0.273
2012-12- 3 16.74 0.273
2012-12- 4 10.30 0.273
2012-12- 5 3.86 0.273
2012-12- 5 21.42 0.273
2012-12- 6 14.98 0.273
2012-12- 7 8.54 0.273
2012-12- 8 2.10 0.273
2012-12- 8 19.66 0.273
2012-12- 9 13.22 0.273
2012-12-10 6.78 0.273
2012-12-11 0.34 0.273
2012-12-11 17.90 0.273
2012-12-12 11.46 0.273
2012-12-13 5.02 0.273
2012-12-13 22.58 0.273
2012-12-14 16.14 0.273
2012-12-15 9.70 0.273
2012-12-16 3.26 0.273
2012-12-16 20.82 0.273
2012-12-17 14.38 0.273
2012-12-18 7.94 0.273

Date/Time UTC (LTc.) Phase
--------------------------
2012-12- 1 20.92 0.777
2012-12- 2 14.48 0.777
2012-12- 3 8.04 0.777
2012-12- 4 1.60 0.777
2012-12- 4 19.16 0.777
2012-12- 5 12.72 0.777
2012-12- 6 6.28 0.777
2012-12- 6 23.84 0.777
2012-12- 7 17.40 0.777
2012-12- 8 10.96 0.777
2012-12- 9 4.52 0.777
2012-12- 9 22.08 0.777
2012-12-10 15.64 0.777
2012-12-11 9.20 0.777
2012-12-12 2.76 0.777
2012-12-12 20.32 0.777
2012-12-13 13.88 0.777
2012-12-14 7.44 0.777
2012-12-15 1.00 0.777
2012-12-15 18.56 0.777
2012-12-16 12.12 0.777
2012-12-17 5.68 0.777
2012-12-17 23.24 0.777

Clear Skies, Petr [2012-11-26 10:20, Ondrejov]

· Useful data were obtained for this one by Stefan Gajdos and Jozef Vilagi from Modra in the past lunation:
http://www.asu.cas.cz/~asteroid/01338_12b_porb.png
http://www.asu.cas.cz/~asteroid/01338_12b_p1.png
Cf. with the data obtained in the previous lunation:
http://www.asu.cas.cz/~asteroid/01338_12a_porb.png
http://www.asu.cas.cz/~asteroid/01338_12a_p1.png

Monitoring the events with high-quality observations is needed for refining the binary model; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 5.61 0.270
2012-11- 2 23.17 0.270
2012-11- 3 16.73 0.270
2012-11- 4 10.29 0.270
2012-11- 5 3.85 0.270
2012-11- 5 21.41 0.270
2012-11- 6 14.97 0.270
2012-11- 7 8.53 0.270
2012-11- 8 2.09 0.270
2012-11- 8 19.65 0.270
2012-11- 9 13.21 0.270
2012-11-10 6.77 0.270
2012-11-11 0.33 0.270
2012-11-11 17.89 0.270
2012-11-12 11.45 0.270
2012-11-13 5.01 0.270
2012-11-13 22.57 0.270
2012-11-14 16.13 0.270
2012-11-15 9.69 0.270
2012-11-16 3.25 0.270
2012-11-16 20.81 0.270
2012-11-17 14.37 0.270
2012-11-18 7.93 0.270
2012-11-19 1.49 0.270
2012-11-19 19.05 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 14.40 0.770
2012-11- 3 7.96 0.770
2012-11- 4 1.52 0.770
2012-11- 4 19.08 0.770
2012-11- 5 12.64 0.770
2012-11- 6 6.20 0.770
2012-11- 6 23.76 0.770
2012-11- 7 17.32 0.770
2012-11- 8 10.88 0.770
2012-11- 9 4.44 0.770
2012-11- 9 22.00 0.770
2012-11-10 15.56 0.770
2012-11-11 9.12 0.770
2012-11-12 2.68 0.770
2012-11-12 20.24 0.770
2012-11-13 13.80 0.770
2012-11-14 7.36 0.770
2012-11-15 0.92 0.770
2012-11-15 18.48 0.770
2012-11-16 12.04 0.770
2012-11-17 5.60 0.770
2012-11-17 23.16 0.770
2012-11-18 16.72 0.770
2012-11-19 10.28 0.770
2012-11-20 3.84 0.770

Clear Skies, Petr [2012-10-29 09:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 18:05 UT.
Stefan [2012-10-22 18:09, Modra] Message sent to observers

· Began observing from Prompt under good conditions at ~0000 UT. Hope to get secondary event at 0348 UT. Joe [2012-10-21 00:16, Dark Sky & PROMPT]

· Began observing from Prompt under good conditions at ~0020 UT. Hope to get primary event at 0306 UT. Joe [2012-10-17 02:17, Dark Sky & PROMPT] Message sent to observers

· I observe this one. But the fog significantly interferes this run.
Marek [2012-10-11 19:36, SkalnatePleso] [Remove]

· Began observing from Prompt under good conditions at ~0100 UT. Hope to get secondary event at 0424 UT. Joe [2012-10-10 01:56, Dark Sky & PROMPT] Message sent to observers

· Trying it from 22:42 UT.
Stefan [2012-10-04 23:23, Modra]

· Planning to observe 19:30-02:00 UT. Jozef [2012-10-03 18:42, Modra]

· Data obtained from Ondrejov, Leura, Prompt and Modra for this binary in its current 3rd apparition so far:
http://www.asu.cas.cz/~asteroid/01338_12_porb.png
http://www.asu.cas.cz/~asteroid/01338_12_p1.png

Monitoring the events with high-quality observations is needed for refining the binary model; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 3 5.43 0.257
2012-10- 3 22.99 0.257
2012-10- 4 16.55 0.257
2012-10- 5 10.11 0.257
2012-10- 6 3.67 0.257
2012-10- 6 21.23 0.257
2012-10- 7 14.79 0.257
2012-10- 8 8.35 0.257
2012-10- 9 1.91 0.257
2012-10- 9 19.47 0.257
2012-10-10 13.03 0.257
2012-10-11 6.59 0.257
2012-10-12 0.15 0.257
2012-10-12 17.71 0.257
2012-10-13 11.27 0.257
2012-10-14 4.83 0.257
2012-10-14 22.39 0.257
2012-10-15 15.95 0.257
2012-10-16 9.51 0.257
2012-10-17 3.07 0.257
2012-10-17 20.63 0.257
2012-10-18 14.19 0.257
2012-10-19 7.75 0.257
2012-10-20 1.31 0.257
2012-10-20 18.87 0.257
2012-10-21 12.43 0.257
2012-10-22 5.99 0.257
2012-10-22 23.55 0.257
2012-10-23 17.11 0.257
2012-10-24 10.67 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 3 14.37 0.766
2012-10- 4 7.93 0.766
2012-10- 5 1.49 0.766
2012-10- 5 19.05 0.766
2012-10- 6 12.61 0.766
2012-10- 7 6.17 0.766
2012-10- 7 23.73 0.766
2012-10- 8 17.29 0.766
2012-10- 9 10.85 0.766
2012-10-10 4.41 0.766
2012-10-10 21.97 0.766
2012-10-11 15.53 0.766
2012-10-12 9.09 0.766
2012-10-13 2.65 0.766
2012-10-13 20.21 0.766
2012-10-14 13.77 0.766
2012-10-15 7.33 0.766
2012-10-16 0.89 0.766
2012-10-16 18.45 0.766
2012-10-17 12.01 0.766
2012-10-18 5.57 0.766
2012-10-18 23.13 0.766
2012-10-19 16.69 0.766
2012-10-20 10.25 0.766
2012-10-21 3.81 0.766
2012-10-21 21.37 0.766
2012-10-22 14.93 0.766
2012-10-23 8.49 0.766
2012-10-24 2.05 0.766

Clear Skies, Petr [2012-10-01 08:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed in night 16/17 september. Leos [2012-09-26 09:30, Modra]

· Began observing from Prompt under good conditions at ~0100 UT. Hope to get secondary event at 0343 UT. Joe [2012-09-21 01:31, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt under good conditions at ~0145 UT. Hope to get secondary event at 0706 UT. Joe [2012-09-15 01:56, Dark Sky & PROMPT]

· Peter Kusnirak took the first night for this return binary in its current 3rd apparition. Primary event detected, in agreement with the model in Pravec et al. (2012):
http://www.asu.cas.cz/~asteroid/01338_12_porb.png
http://www.asu.cas.cz/~asteroid/01338_12_p1.png

Covering both events twice, as usual, would be good for refining the model; their ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 9- 7 14.54 0.257
2012- 9- 8 8.11 0.257
2012- 9- 9 1.69 0.257
2012- 9- 9 19.27 0.257
2012- 9-10 12.85 0.257
2012- 9-11 6.43 0.257
2012- 9-12 0.00 0.257
2012- 9-12 17.58 0.257
2012- 9-13 11.16 0.257
2012- 9-14 4.74 0.257
2012- 9-14 22.32 0.257
2012- 9-15 15.89 0.257
2012- 9-16 9.47 0.257
2012- 9-17 3.05 0.257
2012- 9-17 20.63 0.257
2012- 9-18 14.21 0.257
2012- 9-19 7.78 0.257
2012- 9-20 1.36 0.257
2012- 9-20 18.94 0.257
2012- 9-21 12.52 0.257
2012- 9-22 6.10 0.257
2012- 9-22 23.67 0.257
2012- 9-23 17.25 0.257
2012- 9-24 10.83 0.257
2012- 9-25 4.41 0.257
2012- 9-25 21.99 0.257
2012- 9-26 15.56 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2012- 9- 7 23.32 0.757
2012- 9- 8 16.90 0.757
2012- 9- 9 10.47 0.757
2012- 9-10 4.05 0.757
2012- 9-10 21.63 0.757
2012- 9-11 15.21 0.757
2012- 9-12 8.79 0.757
2012- 9-13 2.36 0.757
2012- 9-13 19.94 0.757
2012- 9-14 13.52 0.757
2012- 9-15 7.10 0.757
2012- 9-16 0.68 0.757
2012- 9-16 18.25 0.757
2012- 9-17 11.83 0.757
2012- 9-18 5.41 0.757
2012- 9-18 22.99 0.757
2012- 9-19 16.57 0.757
2012- 9-20 10.14 0.757
2012- 9-21 3.72 0.757
2012- 9-21 21.30 0.757
2012- 9-22 14.88 0.757
2012- 9-23 8.46 0.757
2012- 9-24 2.03 0.757
2012- 9-24 19.61 0.757
2012- 9-25 13.19 0.757
2012- 9-26 6.77 0.757
2012- 9-27 0.35 0.757

Clear Skies, Petr [2012-09-07 11:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Good observations in this 2nd apparition by Kamil and Peter here, by Joe with Prompt, and by Don from Carbuncle Hill. Results in a good agreement with those from the discovery apparition, H_R and G nailed down with calibrated Ondrejov data.
http://www.asu.cas.cz/~asteroid/01338_10_porb.png
http://www.asu.cas.cz/~asteroid/01338_10_p1.png
Finished for this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2010-03-10 14:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 18:11 UT. Best wishes, Kamil [2010-03-09 21:29, Ondrejov] Message sent to observers

· Observed for about 2 hours tonight. Peter K. [2010-03-07 00:39, Ondrejov]

· Observing this one from 18:57 UT. Best wishes, Kamil [2010-02-21 21:08, Ondrejov] Message sent to observers

· Really useful data obtained by Joe with Prompt, by Don from Carbuncle Hill, and by Kamil and Peter from here in the January lunation. Current solution:
http://www.asu.cas.cz/~asteroid/01338_10_porb.png
http://www.asu.cas.cz/~asteroid/01338_10_p1.png

The binary is expected to show an evolution of events in February, observations of them would bring data useful for future refined modeling. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 2- 3 13.39 0.250
2010- 2- 4 6.95 0.250
2010- 2- 5 0.51 0.250
2010- 2- 5 18.07 0.250
2010- 2- 6 11.63 0.250
2010- 2- 7 5.19 0.250
2010- 2- 7 22.75 0.250
2010- 2- 8 16.31 0.250
2010- 2- 9 9.87 0.250
2010- 2-10 3.43 0.250
2010- 2-10 20.99 0.250
2010- 2-11 14.55 0.250
2010- 2-12 8.11 0.250
2010- 2-13 1.67 0.250
2010- 2-13 19.23 0.250
2010- 2-14 12.79 0.250
2010- 2-15 6.35 0.250
2010- 2-15 23.91 0.250
2010- 2-16 17.47 0.250
2010- 2-17 11.03 0.250
2010- 2-18 4.59 0.250
2010- 2-18 22.15 0.250
2010- 2-19 15.71 0.250
2010- 2-20 9.27 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 2- 3 4.69 0.755
2010- 2- 3 22.25 0.755
2010- 2- 4 15.81 0.755
2010- 2- 5 9.37 0.755
2010- 2- 6 2.93 0.755
2010- 2- 6 20.49 0.755
2010- 2- 7 14.05 0.755
2010- 2- 8 7.61 0.755
2010- 2- 9 1.17 0.755
2010- 2- 9 18.73 0.755
2010- 2-10 12.29 0.755
2010- 2-11 5.85 0.755
2010- 2-11 23.41 0.755
2010- 2-12 16.97 0.755
2010- 2-13 10.53 0.755
2010- 2-14 4.09 0.755
2010- 2-14 21.65 0.755
2010- 2-15 15.21 0.755
2010- 2-16 8.77 0.755
2010- 2-17 2.33 0.755
2010- 2-17 19.89 0.755
2010- 2-18 13.45 0.755
2010- 2-19 7.01 0.755
2010- 2-20 0.57 0.755
2010- 2-20 18.13 0.755

Clear Skies, Petr [2010-01-26 14:25, Ondrejov]

· Started a run at 23:15, Jan 10 UT.
Don [2010-01-11 00:44, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· After an endless series of poor weather nights, I started this one at 22:50 UT.

Don [2010-01-09 22:58, CarbuncleHill]

· Joe has taken two nights with Prompt, covered both events. The primary and secondary events resolved now. Current solution:
http://www.asu.cas.cz/~asteroid/01338_10_porb.png
http://www.asu.cas.cz/~asteroid/01338_10_p1.png

One more coverage for each of the two events, with errors <0.02 mag is needed to establish them well for this apparition. Updated events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 1- 9 16.24 0.250
2010- 1-10 9.81 0.250
2010- 1-11 3.38 0.250
2010- 1-11 20.95 0.250
2010- 1-12 14.52 0.250
2010- 1-13 8.09 0.250
2010- 1-14 1.66 0.250
2010- 1-14 19.23 0.250
2010- 1-15 12.80 0.250
2010- 1-16 6.37 0.250
2010- 1-16 23.94 0.250
2010- 1-17 17.51 0.250
2010- 1-18 11.08 0.250
2010- 1-19 4.65 0.250
2010- 1-19 22.22 0.250
2010- 1-20 15.79 0.250
2010- 1-21 9.36 0.250
2010- 1-22 2.93 0.250
2010- 1-22 20.50 0.250
2010- 1-23 14.07 0.250
2010- 1-24 7.64 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 1-10 1.10 0.755
2010- 1-10 18.67 0.755
2010- 1-11 12.24 0.755
2010- 1-12 5.81 0.755
2010- 1-12 23.38 0.755
2010- 1-13 16.95 0.755
2010- 1-14 10.52 0.755
2010- 1-15 4.09 0.755
2010- 1-15 21.66 0.755
2010- 1-16 15.23 0.755
2010- 1-17 8.80 0.755
2010- 1-18 2.37 0.755
2010- 1-18 19.94 0.755
2010- 1-19 13.51 0.755
2010- 1-20 7.08 0.755
2010- 1-21 0.65 0.755
2010- 1-21 18.22 0.755
2010- 1-22 11.79 0.755
2010- 1-23 5.36 0.755
2010- 1-23 22.93 0.755

Clear Skies, Petr [2010-01-09 10:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Weather conditions look good for a long run on this one tonight. Should start about 00UT and go for about 11 hours.

Russ [2010-01-08 21:45, Shed of Science] Message sent to observers

· Started observation tonight of 0437 UT 0.750 phase event at ~0050 UT at Prompt under excellent conditions. Obtained run last night of the 0217 UT phase 0.750 event. Joe [2010-01-08 01:23, Dark Sky & PROMPT]

· First night for this binary taken by Kamil and Peter here in the current 2nd apparition. A preliminary fit (with a number of things assumed or fixed at values from the 2007 discovery apparition):
http://www.asu.cas.cz/~asteroid/01338_10_porb.png

More data are needed for the events as well as outside them to establish the solution. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 1- 5 15.14 0.250
2010- 1- 6 8.71 0.250
2010- 1- 7 2.28 0.250
2010- 1- 7 19.85 0.250
2010- 1- 8 13.42 0.250
2010- 1- 9 6.99 0.250
2010- 1-10 0.56 0.250
2010- 1-10 18.13 0.250
2010- 1-11 11.70 0.250
2010- 1-12 5.27 0.250
2010- 1-12 22.84 0.250
2010- 1-13 16.41 0.250
2010- 1-14 9.98 0.250
2010- 1-15 3.55 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 1- 5 23.91 0.750
2010- 1- 6 17.48 0.750
2010- 1- 7 11.05 0.750
2010- 1- 8 4.62 0.750
2010- 1- 8 22.19 0.750
2010- 1- 9 15.76 0.750
2010- 1-10 9.33 0.750
2010- 1-11 2.90 0.750
2010- 1-11 20.47 0.750
2010- 1-12 14.04 0.750
2010- 1-13 7.61 0.750
2010- 1-14 1.18 0.750
2010- 1-14 18.75 0.750
2010- 1-15 12.32 0.750

Clear Skies, Petr [2010-01-05 08:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 21:24 UT. Best wishes, Kamil [2010-01-04 22:20, Ondrejov] Message sent to observers

· Finished for this apparition. Petr [2007-04-23 11:46, Ondrejov]

· Observing from 19:15 UT and should cover its primary event. Peter K. [2007-04-15 19:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:15 UT. The sky is very good. Peter K. [2007-04-15 01:33, Ondrejov]

· Observing from 19:15 UT. The sky is very good. Peter K. [2007-04-14 20:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:09 UT, Apr.12 under very good conditions.

Stefan [2007-04-12 20:15, Modra]

· Observed from 09:20UT to 12:42UT once again cut short by cloud. Looks like I might have hit an event at the end of the session but errors way to high (no doubt due to cloud). [2007-04-11 22:02, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observing from 19:20 UT and will cover secondary event. Peter K. [2007-04-11 20:08, Ondrejov]

· Observed from 08:46UT to 14:03UT in worsening conditions (observatory closed due to heavy cloud). Data not the best but submitted anyway. If nothing else I discovered an new suspected Eclipsing Binary Star with a period around 5.4hrs [2007-04-08 04:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observing from 19 UT and covering the primary event. Clear sky. Peter K. [2007-04-07 21:43, Ondrejov]

· Observed Mar 19 and 26 from GMARS. Found a period of 3.15870 with no deviations seen. I will send the data to Petr. [2007-04-06 20:05, Santana] Message sent to BinAstPhotSurvey conference

· I will try to get some data for (1338) Duponta at the start of the night and from 20:30 UT I will try to observe (1967) Menzel if weather permit. Best wishes, Kamil [2007-04-06 16:26, Ondrejov]

· Nice data for the primary event, Adrian:
http://www.asu.cas.cz/~asteroid/01338_all.png
http://www.asu.cas.cz/~asteroid/01338_longpc.png
http://www.asu.cas.cz/~asteroid/01338_shortpc.png

Cheers, Petr [2007-04-05 07:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· I can try this tonight under windy conditions. Attenuation is expected, but also bright Moon. Adrian [2007-04-04 18:40, Modra]

· Monitoring events evolution in the binary in its current second lunation would be useful. Data with errors <=0.02 mag will be needed. Covering each of the events twice should suffice. Ephemerides enclosed below.

Clear Skies, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 4- 7 3.38 0.250
2007- 4- 7 20.95 0.250
2007- 4- 8 14.52 0.250
2007- 4- 9 8.09 0.250
2007- 4-10 1.66 0.250
2007- 4-10 19.23 0.250
2007- 4-11 12.80 0.250
2007- 4-12 6.37 0.250
2007- 4-12 23.94 0.250
2007- 4-13 17.51 0.250
2007- 4-14 11.08 0.250
2007- 4-15 4.65 0.250
2007- 4-15 22.22 0.250
2007- 4-16 15.79 0.250
2007- 4-17 9.36 0.250
2007- 4-18 2.93 0.250
2007- 4-18 20.50 0.250
2007- 4-19 14.07 0.250
2007- 4-20 7.64 0.250
2007- 4-21 1.21 0.250
2007- 4-21 18.78 0.250
2007- 4-22 12.35 0.250
2007- 4-23 5.92 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007- 4- 7 12.15 0.750
2007- 4- 8 5.72 0.750
2007- 4- 8 23.29 0.750
2007- 4- 9 16.86 0.750
2007- 4-10 10.43 0.750
2007- 4-11 4.00 0.750
2007- 4-11 21.57 0.750
2007- 4-12 15.14 0.750
2007- 4-13 8.71 0.750
2007- 4-14 2.28 0.750
2007- 4-14 19.85 0.750
2007- 4-15 13.42 0.750
2007- 4-16 6.99 0.750
2007- 4-17 0.56 0.750
2007- 4-17 18.13 0.750
2007- 4-18 11.70 0.750
2007- 4-19 5.27 0.750
2007- 4-19 22.84 0.750
2007- 4-20 16.41 0.750
2007- 4-21 9.98 0.750
2007- 4-22 3.55 0.750
2007- 4-22 21.12 0.750
2007- 4-23 14.69 0.750 [2007-04-03 07:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our announcement on the binary has appeared on CBET 910. A note on it put to our web pages, and I am also copying the text of the circular below for your convenience.

Cheers, Petr

(1338) DUPONTA
S. Gajdos, L. Kornos, J. Vilagi, and A. Galad, Modra Observatory; P.
Pravec, Ondrejov Observatory; R. Stephens, Goat Mountain Astronomical
Research Station, Yucca Valley, CA; V. Reddy, Department of Earth System
Science and Policy, University of North Dakota, Grand Forks; R. Dyvig,
Quinn, SD; D. Higgins, Canberra, Australia; J. Oey, Leura, N.S.W.,
Australia; and D. Pray, Carbuncle Hill Observatory, Greene, RI, report
that photometric observations obtained during Mar. 6-26 reveal that minor
planet (1338) is a binary system with an orbital period of 17.57 +/- 0.01
hr. The primary shows a period of 3.85453 +/- 0.00009 hr, and it has a
lightcurve amplitude of 0.23 mag. Mutual eclipse/occultation events that
are 0.06- to 0.12-mag deep indicate a secondary-to-primary mean-diameter
ratio of 0.23 +/- 0.02.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2007 CBAT
2007 March 27 (CBET 910) Daniel W. E. Green [2007-03-27 15:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don's data of the past night joined in, they have covered the secondary event. Refined solution:
Pprim = 3.85453 +/-0.00009 h
Porb = 17.57 +/-0.01 h
Ds/Dp = 0.23 +/-0.02
Aprim = 0.23 mag
Depth of events: 0.06-0.12 mag
http://www.asu.cas.cz/~asteroid/01338_all.png
http://www.asu.cas.cz/~asteroid/01338_longpc.png
http://www.asu.cas.cz/~asteroid/01338_shortpc.png
Ok, now we have together all pieces for this one. Peter K. plans to take one more coverage of the secondary event tonight, if errors less than 0.02 mag can be achieved, but it comes a time to publish it on CBET. I and Adrian (visiting me in this week) are going to write a draft announcement.

Cheers, Petr [2007-03-26 15:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2007-03-24.1 by Don from Carbuncle Hill
2007-03-24.2 by Vishnu and Ron from Badlands
2007-03-25.3 by Bob Stephens from GMARS.
The orbital period is unique now: 17.57 h.
Vishnu and Ron have covered the primary event, while Bob has covered the shallower secondary event. The current solution:
Pprim = 3.85454 +/-0.00009 h
Porb = 17.57 +/-0.01 h
Ds/Dp = 0.24 +/-0.02
Aprim = 0.23 mag
Depth of events: 0.06-0.12 mag
http://www.asu.cas.cz/~asteroid/01338_all.png
http://www.asu.cas.cz/~asteroid/01338_longpc.png
http://www.asu.cas.cz/~asteroid/01338_shortpc.png

A last thing that remains to be done before we announce this one on CBET is to cover the secondary event once more, to refine the estimate for Ds/Dp. The Moon will begin to disturb soon, but I think that we have a good chance to cover one of the next two predicted events:

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3-26 19.03 0.750
2007- 3-27 12.60 0.750

Cheers, Petr [2007-03-26 11:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at ~00:45 UT, Mar 26.
Don [2007-03-26 00:57, CarbuncleHill]

· Planning session from GMARS tonight starting about 3:00 UT. [2007-03-24 22:48, Santana] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006-03-22.2 and 23.2 by Vishnu and Ron from Badlands
2006-03-22.9 by Adrian from Modra
2006-03-23.5 by David from Hunters Hill
2006-03-23.6 by Julian from Leura.
David and Julian have covered the 0.25-phase event. Current solution (with Porb of 17.57 h used for the second plot):
http://www.asu.cas.cz/~asteroid/01338_all.png
http://www.asu.cas.cz/~asteroid/01338_longpc.png
http://www.asu.cas.cz/~asteroid/01338_shortpc.png
Things that remain to be done before we announce this binary:
Resolving the orbital period uniquely - there remains an ambiguity: both 17.57 h and 52.71 h fit equally well, but the ambiguity should be broken soon with a few more sessions.
Covering the 0.75-phase event twice.
Covering the 0.25-phase event once more.

After the ambiguity in Porb is resolved, I'll provide an ephemeris for the events so that completing the coverage of the events can be done most efficiently then.

Cheers, Petr [2007-03-24 12:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have inadvertently duplicated David's observation last night.. In any case, this data can be used to confirm last night's event. Observed from 11.45UT to 17.19UT. [2007-03-24 07:01, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed from 9:23UT to 16:12UT in good conditions. I believe I caught an event. Data sent to Petr and Peter. [2007-03-24 04:00, HuntersHill]

· Started run at 4:30 UT. Should get 4-5 hours worth of data if weather holds. Vishnu & Ron [2007-03-23 04:17, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· I wanted to join and catch the expected attenuation, but clouds and changing conditions were against. Adrian [2007-03-23 00:48, Modra]

· Started run at 2:30 UT. Should get 5 hours of data if weather holds. Vishnu & Ron [2007-03-22 02:34, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Data of March 18.2 by Bob Stephens from GMARS joined in, as well a re-reduced data of March 16.9 by Jozef, Stefan and Leos from Modra, covering an increasing branch of the event:
http://www.asu.cas.cz/~asteroid/01338_all.png
http://www.asu.cas.cz/~asteroid/01338_longpc.png
http://www.asu.cas.cz/~asteroid/01338_shortpc.png
The new data fit well with the solution, but they have not resolved the ambiguity yet. More data (long sessions with errors not greater than 0.02 mag) are needed.

Clear Skies, Petr [2007-03-19 08:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a 3-1/2 run in from GMARS. Will send data to Petr and Peter. [2007-03-18 14:55, Santana]

· Will attempt to image tonight from GMARS, clouds permitting. [2007-03-17 22:21, Santana] Message sent to BinAstPhotSurvey conference

· Data from Modra for this one show deviations from single periodicity that suggest a binary nature. The short period is uniquely determined, 3.8547 +/-0.0003 h. A preliminary (not unique) solution for the orbital period is 17.57 h. See
http://www.asu.cas.cz/~asteroid/01338_all.png
http://www.asu.cas.cz/~asteroid/01338_longpc.png
http://www.asu.cas.cz/~asteroid/01338_shortpc.png
More data (long sessions with errors not greater than 0.02 mag) are needed to confirm the suspected binary character, to establish the orbital period solution as well as Ds/Dp.

Cheers, Petr [2007-03-17 14:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Mar.16, from 19:30 to 23:22UT.

Stefan/Jozef [2007-03-17 03:35, Modra]

· Doing it from 20:07UT, Mar.15, under bad condition. Remeasured night of Mar.06, sent together with Leos'
results from Mar.11.

Stefan/Jozef [2007-03-15 23:43, Modra] Message sent to BinAstPhotSurvey conference

· Adrian's analysis revealed P~4.05 +/-0.06 hours and A~0.2mag. Due to not fully correct calibration, the
data are not prepared for delivery to Petr, yet.

Stefan [2007-03-07 11:26, Modra]

· Bad conditions - very rough estimate: period of about 2.15 or 4.3 hours, A ~ 0.15mag

Stefan [2007-03-07 05:11, Modra] Message sent to BinAstPhotSurvey conference

· Tried this target once more - it is bright enough, still. Observed from 19:15 UT on Mar.6, 2007, hope, to 2:00 UT.

Stefan [2007-03-06 22:18, Modra]

· Unsuccessfull attempt from S. Pleso. Petr [2007-02-27 14:32, Ondrejov]

(6158) Shosanbetsu (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain and Julian Oey from Leura: It's U = 2+ or 3- solution:
http://www.asu.cas.cz/~asteroid/06158.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work on this one guys.

Petr [2015-02-02 16:13, Ondrejov]

· observed from 13:53UT for 4 hours. [2015-01-17 23:16, Blue Mountains Obs] Message sent to observers

· observed from 12:14 UT 01/16 for 5.5 hours. will work on this again tonight [2015-01-17 03:05, Blue Mountains Obs]

· I plan to start a run on this at 03:15 UT.
Don [2015-01-02 02:49, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start this one at 03:20 UT.
Don [2015-01-01 01:47, Sugarloaf]

· Starting this at 03:25 UT.
Don [2014-12-31 03:07, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start this new target at 07:45 UT.
Don [2014-12-20 01:21, Sugarloaf]

(2623) Zech (Finished) [Add new note]
· Closed for the discovery apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2015-02-02 10:33, Ondrejov]

· I started this object at 17:15 UT. Gabo [2015-01-21 17:22, SkalnatePleso] [Remove]
Message sent to observers

· I started a run at 22:45, Dec 29 UT.
Don [2014-12-29 22:48, Sugarloaf]

· Started this one at 23:00, Dec 26 UT, as a secondary target.
Don [2014-12-26 23:20, Sugarloaf] Message sent to observers

· I started this at 00:45 UT.
Don [2014-12-20 01:19, Sugarloaf]

· Began run from Dark Sky at 2320 UT. Joe [2014-12-14 23:35, Dark Sky & PROMPT]

· I started a run at 22:00, Dec 13 UT.
Don [2014-12-14 01:17, Sugarloaf] Message sent to observers

· More data have been taken for this one in November. It's interesting that we missed events completely (or did they disappear?)
http://www.asu.cas.cz/~asteroid/02623_2014b_p1.png
http://www.asu.cas.cz/~asteroid/02623_2014b_p2.png
http://www.asu.cas.cz/~asteroid/02623_2014a_porb.png
http://www.asu.cas.cz/~asteroid/02623_2014a_p1.png
http://www.asu.cas.cz/~asteroid/02623_2014a_p2.png

The model is not good enough to give a reasonable event prediction for December. More data (at any orbital phase) would be useful.

Clear Skies, Petr [2014-12-02 14:49, Ondrejov]

· We started this target at ~4hUT at the Perkins telescope (USA).
Audrey [2014-11-21 03:53, Thirouin Audrey] Message sent to observers

· I started this at 00:20 UT to observe the composite lc outside of event.
Don [2014-11-15 01:53, Sugarloaf]

· I started a run on this at 00:20 UT, and hope to catch the first part (and middle) of the 0.749 phase event.
Don [2014-11-13 00:34, Sugarloaf] Message sent to observers

· Our discovery announcement has appeared on CBET 4012.

Cheers, Petr

(2623) ZECH
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; V. Chiorny and Yu. N. Krugly, Kharkiv
Observatory; V. Benishek, Belgrade Observatory; J. Pollock, D. B. Caton, A. B.
Smith, and R. L. Hawkins, Appalachian State University; R. Inasaridze,
Abastumani Observatory; R. Montaigut and A. Leroy, OPERA Observatory, France;
and D. E. Reichart, J. B. Haislip and A. P. LaCluyze, University of North
Carolina, Chapel Hill, report that photometric observations obtained during
2014 Oct. 7-31 reveal that minor planet (2623) is a binary system with an
orbital period of 117.2 ± 0.3 hr. The primary shows a period of 2.7401 ±
0.0002 hr, and it has a lightcurve amplitude of 0.22 mag at solar phases
13-25 deg, suggesting a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.09-magnitude deep indicate a lower limit on the
secondary-to-primary mean-diameter ratio of 0.29. The secondary is
non-synchronous, and it has a period of 18.718 ± 0.008 hr and an amplitude
of 0.08 mag in the observed lightcurve, suggesting a secondary elongation of
about 2:1 after removing contribution of light from the primary.

2014 November 5 (CBET 4012) Daniel W. E. Green [2014-11-06 07:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· We are working on a CBET for this one, but in the meantime, an events ephemeris for the next lunation is below. A current solution:
http://www.asu.cas.cz/~asteroid/02623_porb.png
http://www.asu.cas.cz/~asteroid/02623_p1.png
http://www.asu.cas.cz/~asteroid/02623_p2.png

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-10 23.6 0.261
2014-11-15 20.8 0.261
2014-11-20 18.0 0.261
2014-11-25 15.2 0.261
2014-11-30 12.4 0.261

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-13 8.8 0.749
2014-11-18 6.0 0.749
2014-11-23 3.2 0.749
2014-11-28 0.4 0.749

Clear Skies, Petr [2014-11-04 14:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by Don Pray from Sugarloaf Mountain, by Vladimir Benishek from Sopot, and by Joe Pollock from DSO have ruled out the 39-h candidate orbital period. It is a unique solution now:
http://www.asu.cas.cz/~asteroid/02623_porb.png
http://www.asu.cas.cz/~asteroid/02623_p1.png
http://www.asu.cas.cz/~asteroid/02623_p2.png

We will do a CBET around the full moon next week. In the meantime please try to cover upcoming events, to improve solution; their ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-11- 1 5.1 0.262

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-29 16.8 0.747
2014-11- 3 13.8 0.747

Clear Skies, Petr [2014-10-29 11:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Oct. 27/28 (19:34 - 03:53 UT) from Sopot AO. [2014-10-29 00:19, Sopot AO] Message sent to observers

· More great data were taken by Don Pray from Sugarloaf Mountain, by Joe Pollock with DSO telescope, and by Vasilij Chiorny from Grakovo. One full and one partial event coverage. We have two candidate P_orb values now: 39 and 117 hours. The third plot here shows the eclipsing lightcurve component for the shorter one:
http://www.asu.cas.cz/~asteroid/02623_2014b_p1.png
http://www.asu.cas.cz/~asteroid/02623_2014b_p2.png
http://www.asu.cas.cz/~asteroid/02623_2014b_porb.png

I cannot decide between the two orbital periods yet. Below are event ephemerides for both. Observations at times where there is predicted to occur an event for the shorter period, but not for the longer one, will decide.

For P_orb = 39 h:

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-28 23.06 0.280
2014-10-30 14.06 0.280
2014-11- 1 5.06 0.280
2014-11- 2 20.06 0.280

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-29 16.68 0.732
2014-10-31 7.68 0.732
2014-11- 1 22.68 0.732
2014-11- 3 13.68 0.732

For P_orb = 117 h:

Date/Time UTC (LTc.) Phase
--------------------------
2014-11- 1 5.2 0.094

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-29 16.7 0.577
2014-11- 3 13.7 0.577

Clear Skies, Petr [2014-10-28 15:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 01:40 UT.
Don [2014-10-28 01:21, Sugarloaf] Message sent to observers

· Started at 0215 UT from DSO. Hope to get about 8 hours. Joe [2014-10-27 03:24, Dark Sky & PROMPT]

· Observed last night 0215-1035 UT from Dark Sky Observatory in North Carolina. Joe [2014-10-26 17:17, Dark Sky & PROMPT] Message sent to observers

· I started this at 02:20 UT, but uncertain clouds later may interfere.
Don [2014-10-25 02:38, Sugarloaf]

· Observed this one tonight from 18.3 UT to 23.3 UT. Vasilij Ch. [2014-10-24 23:57, Kharkiv] Message sent to observers

· Data by Vladimir Benishek from Sopot AO and by Joe Pollock with Prompt joined in. Vladimir has captured what appears to be a full long event on 2014-10-20.0. An event period is unclear yet, but there appears to be a second, longer period rotational lightcurve component, though its period solution is ambiguous yet; one of a few possible values is in the second plot here:
http://www.asu.cas.cz/~asteroid/02623_2014b_p1.png
http://www.asu.cas.cz/~asteroid/02623_2014b_p2.png

More data!

Clear Skies, Petr [2014-10-21 23:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target on Oct 18/19 (from 20:04 to 03:43 UT) and Oct. 19/20 (from 19:43 to 03:40 UT). Vladimir Benishek [2014-10-21 19:37, Sopot AO]

· Began a run from Prompt Tololo at 0457 UT. Hope to get about 4 hours. Joe [2014-10-21 05:08, Dark Sky & PROMPT] Message sent to observers

· This new target has been started by Vasilij Chiorny from Kharkiv on October 7 and 8: a short period detected, but no deviation apparent. Don Pray took an additional night October 20 and detected an apparent brightness drop, which may be a mutual event in binary system.
http://www.asu.cas.cz/~asteroid/02623_2014a_p1.png
http://www.asu.cas.cz/~asteroid/02623_2014b_p1.png
http://www.asu.cas.cz/~asteroid/02623_2014b_porb.png
(The second, longer period is arbitrary, set just for plotting purpose.)

More observations are needed to confirm its binary nature and to establish orbital period. I encourage observers here to help out.

Clear Skies, Petr [2014-10-21 01:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target two nights of 6/7 Oct and 7/8 Oct 2014.
Period of asteroid 2.74 hr and amplitude about 0.28 mag. Vasilij Ch. [2014-10-14 14:52, Kharkiv]

(6502) 1993 XR1 (Finished) - Serious binary suspect [Add new note]
· This is a serious binary suspect, but confirmation is needed in the future.
http://www.asu.cas.cz/~asteroid/06502_2014a_p1.png
http://www.asu.cas.cz/~asteroid/06502_2014b_p1.png

Petr [2015-01-23 07:14, Ondrejov]

· Started this one at 23:40, Jan 20 UT.
Don [2015-01-20 23:38, Sugarloaf] Message sent to observers

· Will work from SRO tonight. -Walt [2015-01-18 00:47, Sonoita]

· I started this at 00:00 UT.
Don [2015-01-16 00:47, Sugarloaf]

· Observed from 2015-01-13 17:39 UT to 22:50 UT. Best wishes, Kamil and Honza [2015-01-14 16:28, Ondrejov] Message sent to observers

· Started at 00:30 UT.
Don [2015-01-11 01:52, Sugarloaf]

· Started this at 01:10 UT.
Don [2015-01-02 02:27, Sugarloaf]

· I started this 01:20 UT.
Don [2015-01-01 01:44, Sugarloaf] Message sent to observers

· I neglected to note that I di a run on this from 01:20-09:20, Dec 30 UT.
Don [2014-12-30 16:30, Sugarloaf]

· Will run from SRO tonight. -Walt [2014-12-30 03:32, Sonoita] Message sent to observers

· I plan to start this at 01:40, Dec 27 UT.
Don [2014-12-26 23:21, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed on Dec. 24-25 (20:12 - 03:18 UT) at the Sopot AO.
Vladimir [2014-12-25 16:35, Sopot AO] Message sent to observers

· Don Pray has observed this new target from Sugarloaf Mountain on two nights. It turns out to be a binary suspect. A very tentative solution:
http://www.asu.cas.cz/~asteroid/06502_all.png
http://www.asu.cas.cz/~asteroid/06502_porb.png
http://www.asu.cas.cz/~asteroid/06502_p1.png
(Note: Orbital period has not been estimated; the period in the first two plots was set just for plotting purpose.)

I encourage all here to observe this object (with errors not greater than 0.03 mag).

Clear Skies, Petr [2014-12-21 08:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a short run on this new target last night, and started a second run tonight at 02:30 UT. Clouds may interfere later.
Don [2014-12-16 04:07, Sugarloaf]

(8107) 1995 BR4 (Finished) [Add new note]
· Julian Oey has done this new target from Leura: Unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/08107.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, Julian.

Cheers, Petr [2015-01-17 11:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 01/16 11:22 to 16:03 UT. additional short data was also obtained on 01/14 and 12/30/14 [2015-01-16 20:57, Blue Mountains Obs] Message sent to observers

· observed from 11:54 to 16:54UT 01/07. Good result considering full moon [2015-01-08 01:17, Blue Mountains Obs]

· New target observed from 12:41 to 17:25 UT 12/16. Large amplitude of about 0.5 m [2014-12-17 05:25, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(6943) 1978 VR4 (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain: Unique period, multiple coverage, no deviation,
http://www.asu.cas.cz/~asteroid/06943.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Cheers, Petr [2015-01-13 10:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:30 UT.
Don [2015-01-11 01:54, Sugarloaf]

· I started a run on this fast rotator at 01:30 UT
Don [2015-01-02 02:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run on this at 01:25 UT.
Don [2015-01-01 01:45, Sugarloaf]

· I started this new target at 01:25 UT.
Don [2014-12-31 01:47, Sugarloaf] Message sent to BinAstPhotSurvey conference

(59490) 1999 JD4 (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain and by Gabo Cervak, Zuzana K. and Marek Husarik from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/59490.png
It's sufficient data for the slowish rotator for the Survey; target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work folks.

Cheers, Petr [2015-01-09 15:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 21:30 UT. Gabo [2014-11-21 22:28, SkalnatePleso] [Remove]
Message sent to observers

· Observed from 19:30 UT. Gabo [2014-11-20 19:41, SkalnatePleso] [Remove]

· I started at 20:20 UT. Zuzana [2014-10-31 20:23, SkalnatePleso] [Remove]
Message sent to observers

· I started at 20:55 UT. Gabo [2014-10-30 20:59, SkalnatePleso] [Remove]

· Observed from 20:40 UT. Gabo [2014-10-28 20:40, SkalnatePleso] [Remove]
Message sent to observers

· Observed from 20:20 UT. Gabo [2014-10-27 20:47, SkalnatePleso] [Remove]

· Started at 19 UT. Marek [2014-10-25 21:19, SkalnatePleso] [Remove]
Message sent to observers

· I started at 19:10 UT. Zuzana [2014-10-18 19:10, SkalnatePleso] [Remove]

· Started at 01:50 UT.
Don [2014-10-18 00:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target at 00:15 UT.
Don [2014-10-03 01:06, Sugarloaf]

(7225) Huntress (Finished) - return binary [Add new note]
· Done in the 3rd apparition. We'll start modeling. Petr [2015-01-07 09:48, Ondrejov]

· Observed from 2014-12-31 21h30 to 2015-01-01 2h to get the 0.75 phase. Very close to the moon. Happy new year ! [2015-01-01 06:09, Pic du Midi] Message sent to observers

· started observation from 10:56 UT and captured 0.75 phase [2014-12-30 05:54, Blue Mountains Obs]

· Started a run at 22:40, Dec 29 UT, and hope to catch the 0.762 phase event.
Don [2014-12-29 22:50, Sugarloaf] Message sent to observers

· Observed on Dec. 27 (16:07 - 18:38 UT) from the Sopot AO.
Vladimir [2014-12-27 22:46, Sopot AO]

· I started a run on this at 23:15, Dec 26 UT and hope to catch the 0.762 phase event.
Don [2014-12-26 23:15, Sugarloaf] Message sent to observers

· The 0.25-phase event has been covered sufficiently with recent observations by Don Pray and Vladimir Benishek:
http://www.asu.cas.cz/~asteroid/07225_2014c_porb.png
http://www.asu.cas.cz/~asteroid/07225_2014c_p1.png

No more data for the 0.25-phase event are needed. Covering the 0.75-phase event would be good.

Clear Skies, Petr [2014-12-21 08:15, Ondrejov]

· I started a run on this at 01:00 UT.
Don [2014-12-20 01:16, Sugarloaf] Message sent to observers

· Observed at the Sopot AO on Dec. 18 (19:13 - 21:53 UT).
Vladimir [2014-12-19 14:31, Sopot AO]

· I started this at 02:15 UT near the bottom of the 0.762 phase event.
Don [2014-12-16 04:04, Sugarloaf] Message sent to observers

· I started a run at 23:20, Dec 13 UT and should catch the 0.762 phase event.
Don [2014-12-14 01:19, Sugarloaf]

· Began run under good conditions from Prompt at 0050 UT. Hope to get primary event at 0243 UT. Joe [2014-12-12 01:22, Dark Sky & PROMPT] Message sent to observers

· This one has been worked very well by Don Pray from Sugarloaf Mountain and by Vladimir Benishek from Sopot in November:
http://www.asu.cas.cz/~asteroid/07225_2014b_porb.png
http://www.asu.cas.cz/~asteroid/07225_2014b_p1.png
http://www.asu.cas.cz/~asteroid/07225_2014a_porb.png
http://www.asu.cas.cz/~asteroid/07225_2014a_p1.png

Further monitoring will be useful for modeling. Errors < 0.02 mag are needed; don't bother in less ideal conditions. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-12- 9 16.04 0.263
2014-12-10 6.71 0.263
2014-12-10 21.38 0.263
2014-12-11 12.05 0.263
2014-12-12 2.72 0.263
2014-12-12 17.39 0.263
2014-12-13 8.06 0.263
2014-12-13 22.73 0.263
2014-12-14 13.40 0.263
2014-12-15 4.07 0.263
2014-12-15 18.74 0.263
2014-12-16 9.41 0.263
2014-12-17 0.08 0.263
2014-12-17 14.75 0.263
2014-12-18 5.42 0.263
2014-12-18 20.09 0.263
2014-12-19 10.76 0.263
2014-12-20 1.43 0.263
2014-12-20 16.10 0.263
2014-12-21 6.77 0.263
2014-12-21 21.44 0.263
2014-12-22 12.11 0.263
2014-12-23 2.78 0.263
2014-12-23 17.45 0.263
2014-12-24 8.12 0.263
2014-12-24 22.79 0.263
2014-12-25 13.46 0.263
2014-12-26 4.13 0.263
2014-12-26 18.80 0.263
2014-12-27 9.47 0.263
2014-12-28 0.14 0.263
2014-12-28 14.81 0.263
2014-12-29 5.48 0.263
2014-12-29 20.15 0.263
2014-12-30 10.82 0.263

Date/Time UTC (LTc.) Phase
--------------------------
2014-12- 9 23.36 0.762
2014-12-10 14.03 0.762
2014-12-11 4.70 0.762
2014-12-11 19.37 0.762
2014-12-12 10.04 0.762
2014-12-13 0.71 0.762
2014-12-13 15.38 0.762
2014-12-14 6.05 0.762
2014-12-14 20.72 0.762
2014-12-15 11.39 0.762
2014-12-16 2.06 0.762
2014-12-16 16.73 0.762
2014-12-17 7.40 0.762
2014-12-17 22.07 0.762
2014-12-18 12.74 0.762
2014-12-19 3.41 0.762
2014-12-19 18.08 0.762
2014-12-20 8.75 0.762
2014-12-20 23.42 0.762
2014-12-21 14.09 0.762
2014-12-22 4.76 0.762
2014-12-22 19.43 0.762
2014-12-23 10.10 0.762
2014-12-24 0.77 0.762
2014-12-24 15.44 0.762
2014-12-25 6.11 0.762
2014-12-25 20.78 0.762
2014-12-26 11.45 0.762
2014-12-27 2.12 0.762
2014-12-27 16.79 0.762
2014-12-28 7.46 0.762
2014-12-28 22.13 0.762
2014-12-29 12.80 0.762
2014-12-30 3.47 0.762

Clear Skies, Petr [2014-12-03 12:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 00:00 UT and hope to catch the 0.250 phase event.
Don [2014-11-28 22:24, Sugarloaf] Message sent to observers

· I started this at 00:40 UT, and should catch the 0.749 phase event.
Don [2014-11-22 00:38, Sugarloaf]

· Started on this at 01:50 UT, and hope to catch the 0.250 phase event.
Don [2014-11-21 02:15, Sugarloaf] Message sent to observers

· Observed on November 14 from 18:24 to 23:51 UT at the Sopot AO. [2014-11-16 12:27, Sopot AO]

· I started this at 01:00 UT, and hope to catch the 0.749 phase event.
Don [2014-11-16 01:24, Sugarloaf] Message sent to observers

· Started a run at 01:00 UT and hope to catch the 0.250 phase event.
Don [2014-11-15 01:57, Sugarloaf]

· Don Pray has taken second night from Sugarloaf Mountain for this return binary in its current apparition:
http://www.asu.cas.cz/~asteroid/07225_2014_porb.png
http://www.asu.cas.cz/~asteroid/07225_2014_p1.png

One more coverage of both events in this lunation would be good; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-14 14.38 0.250
2014-11-15 5.05 0.250
2014-11-15 19.72 0.250
2014-11-16 10.39 0.250
2014-11-17 1.06 0.250
2014-11-17 15.73 0.250
2014-11-18 6.40 0.250
2014-11-18 21.07 0.250
2014-11-19 11.74 0.250
2014-11-20 2.41 0.250
2014-11-20 17.08 0.250
2014-11-21 7.75 0.250
2014-11-21 22.42 0.250
2014-11-22 13.09 0.250
2014-11-23 3.76 0.250
2014-11-23 18.43 0.250
2014-11-24 9.10 0.250
2014-11-24 23.77 0.250
2014-11-25 14.44 0.250
2014-11-26 5.11 0.250
2014-11-26 19.78 0.250
2014-11-27 10.45 0.250
2014-11-28 1.12 0.250
2014-11-28 15.79 0.250
2014-11-29 6.46 0.250
2014-11-29 21.13 0.250
2014-11-30 11.80 0.250
2014-12- 1 2.47 0.250
2014-12- 1 17.14 0.250
2014-12- 2 7.81 0.250
2014-12- 2 22.48 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2014-11-14 21.69 0.749
2014-11-15 12.36 0.749
2014-11-16 3.03 0.749
2014-11-16 17.70 0.749
2014-11-17 8.37 0.749
2014-11-17 23.04 0.749
2014-11-18 13.71 0.749
2014-11-19 4.38 0.749
2014-11-19 19.05 0.749
2014-11-20 9.72 0.749
2014-11-21 0.39 0.749
2014-11-21 15.06 0.749
2014-11-22 5.73 0.749
2014-11-22 20.40 0.749
2014-11-23 11.07 0.749
2014-11-24 1.74 0.749
2014-11-24 16.41 0.749
2014-11-25 7.08 0.749
2014-11-25 21.75 0.749
2014-11-26 12.42 0.749
2014-11-27 3.09 0.749
2014-11-27 17.76 0.749
2014-11-28 8.43 0.749
2014-11-28 23.10 0.749
2014-11-29 13.77 0.749
2014-11-30 4.44 0.749
2014-11-30 19.11 0.749
2014-12- 1 9.78 0.749
2014-12- 2 0.45 0.749
2014-12- 2 15.12 0.749
2014-12- 3 5.79 0.749

Clear Skies, Petr [2014-11-14 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:10 UT.
don [2014-11-13 01:09, Sugarloaf] Message sent to observers

· Don Pray has taken the first night for this return binary in its current apparition. There is apparent a possible shallow event,
http://www.asu.cas.cz/~asteroid/07225_2014_porb.png
http://www.asu.cas.cz/~asteroid/07225_2014_p1.png
A confirmation with good data (errors < 0.02 mag) is needed.

Clear Skies, Petr [2014-11-12 08:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 01:25 UT.
Don [2014-11-11 02:44, Sugarloaf]

· Second apparition done, will need a 3rd one for modeling. Petr [2012-07-01 08:31, Ondrejov]

· Began run under good conditions from Prompt at 2320 UT. Hope to get primary event at 0453 UT. Joe [2012-05-18 23:24, Dark Sky & PROMPT] Message sent to observers

· Good quality data (errors <= 0.02 mag) would be useful to establish this one in this return apparition; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 5-10 0.84 0.270
2012- 5-10 15.51 0.270
2012- 5-11 6.18 0.270
2012- 5-11 20.85 0.270
2012- 5-12 11.52 0.270
2012- 5-13 2.19 0.270
2012- 5-13 16.86 0.270
2012- 5-14 7.53 0.270
2012- 5-14 22.20 0.270
2012- 5-15 12.87 0.270
2012- 5-16 3.54 0.270
2012- 5-16 18.21 0.270
2012- 5-17 8.88 0.270
2012- 5-17 23.55 0.270
2012- 5-18 14.22 0.270
2012- 5-19 4.89 0.270
2012- 5-19 19.56 0.270
2012- 5-20 10.23 0.270
2012- 5-21 0.90 0.270
2012- 5-21 15.57 0.270
2012- 5-22 6.24 0.270
2012- 5-22 20.91 0.270
2012- 5-23 11.58 0.270
2012- 5-24 2.25 0.270
2012- 5-24 16.92 0.270
2012- 5-25 7.59 0.270
2012- 5-25 22.26 0.270
2012- 5-26 12.93 0.270
2012- 5-27 3.60 0.270
2012- 5-27 18.27 0.270
2012- 5-28 8.94 0.270
2012- 5-28 23.61 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2012- 5- 9 17.51 0.770
2012- 5-10 8.18 0.770
2012- 5-10 22.85 0.770
2012- 5-11 13.52 0.770
2012- 5-12 4.19 0.770
2012- 5-12 18.86 0.770
2012- 5-13 9.53 0.770
2012- 5-14 0.20 0.770
2012- 5-14 14.87 0.770
2012- 5-15 5.54 0.770
2012- 5-15 20.21 0.770
2012- 5-16 10.88 0.770
2012- 5-17 1.55 0.770
2012- 5-17 16.22 0.770
2012- 5-18 6.89 0.770
2012- 5-18 21.56 0.770
2012- 5-19 12.23 0.770
2012- 5-20 2.90 0.770
2012- 5-20 17.57 0.770
2012- 5-21 8.24 0.770
2012- 5-21 22.91 0.770
2012- 5-22 13.58 0.770
2012- 5-23 4.25 0.770
2012- 5-23 18.92 0.770
2012- 5-24 9.59 0.770
2012- 5-25 0.26 0.770
2012- 5-25 14.93 0.770
2012- 5-26 5.60 0.770
2012- 5-26 20.27 0.770
2012- 5-27 10.94 0.770
2012- 5-28 1.61 0.770
2012- 5-28 16.28 0.770
2012- 5-29 6.95 0.770

Clear Skies, Petr [2012-05-02 13:10, Ondrejov]

· Will begin observing from Prompt at 2320 UT. Hope to get secondary event at 0450 UT. Joe [2012-04-22 22:30, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt at 2315 UT. Hope to get full primary event centered at 0030 UT and then full secondary event centered at 0727 UT. Perfect time placement and a clean path. Current conditions are excellent. May the weather, equipment and GRB gods be kind. Joe [2012-04-17 23:36, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt at 2325 UT. Hope to get primary event a 0430 UT. Joe [2012-04-15 23:24, Dark Sky & PROMPT]

· Somewhat unusually fast evolution seen in the data by Joe Pollock with PROMPT and by David Higgins from Hunters Hill:
http://www.asu.cas.cz/~asteroid/07225_12a_porb.png
http://www.asu.cas.cz/~asteroid/07225_12a_p1.png
http://www.asu.cas.cz/~asteroid/07225_12b_porb.png
http://www.asu.cas.cz/~asteroid/07225_12b_p1.png

Monitoring it in the upcoming lunation will be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-10 1.80 0.255
2012- 4-10 16.47 0.255
2012- 4-11 7.14 0.255
2012- 4-11 21.81 0.255
2012- 4-12 12.48 0.255
2012- 4-13 3.15 0.255
2012- 4-13 17.82 0.255
2012- 4-14 8.49 0.255
2012- 4-14 23.16 0.255
2012- 4-15 13.83 0.255
2012- 4-16 4.50 0.255
2012- 4-16 19.17 0.255
2012- 4-17 9.84 0.255
2012- 4-18 0.51 0.255
2012- 4-18 15.18 0.255
2012- 4-19 5.85 0.255
2012- 4-19 20.52 0.255
2012- 4-20 11.19 0.255
2012- 4-21 1.86 0.255
2012- 4-21 16.53 0.255
2012- 4-22 7.20 0.255
2012- 4-22 21.87 0.255
2012- 4-23 12.54 0.255
2012- 4-24 3.21 0.255
2012- 4-24 17.88 0.255
2012- 4-25 8.55 0.255
2012- 4-25 23.22 0.255
2012- 4-26 13.89 0.255
2012- 4-27 4.56 0.255
2012- 4-27 19.23 0.255
2012- 4-28 9.90 0.255
2012- 4-29 0.57 0.255
2012- 4-29 15.24 0.255
2012- 4-30 5.91 0.255
2012- 4-30 20.58 0.255
2012- 5- 1 11.25 0.255
2012- 5- 2 1.92 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4- 9 18.07 0.728
2012- 4-10 8.74 0.728
2012- 4-10 23.41 0.728
2012- 4-11 14.08 0.728
2012- 4-12 4.75 0.728
2012- 4-12 19.42 0.728
2012- 4-13 10.09 0.728
2012- 4-14 0.76 0.728
2012- 4-14 15.43 0.728
2012- 4-15 6.10 0.728
2012- 4-15 20.77 0.728
2012- 4-16 11.44 0.728
2012- 4-17 2.11 0.728
2012- 4-17 16.78 0.728
2012- 4-18 7.45 0.728
2012- 4-18 22.12 0.728
2012- 4-19 12.79 0.728
2012- 4-20 3.46 0.728
2012- 4-20 18.13 0.728
2012- 4-21 8.80 0.728
2012- 4-21 23.47 0.728
2012- 4-22 14.14 0.728
2012- 4-23 4.81 0.728
2012- 4-23 19.48 0.728
2012- 4-24 10.15 0.728
2012- 4-25 0.82 0.728
2012- 4-25 15.49 0.728
2012- 4-26 6.16 0.728
2012- 4-26 20.83 0.728
2012- 4-27 11.50 0.728
2012- 4-28 2.17 0.728
2012- 4-28 16.84 0.728
2012- 4-29 7.51 0.728
2012- 4-29 22.18 0.728
2012- 4-30 12.85 0.728
2012- 5- 1 3.52 0.728
2012- 5- 1 18.19 0.728

Clear Skies, Petr [2012-04-04 08:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Have been running on it since 0055 UT and am in middle of the secondary centered at 0221 UT. Joe [2012-03-26 02:56, Dark Sky & PROMPT] Message sent to observers

· Observed 2012-03-20 from 10:40 UT to 18:07 UT in reasonable conditions though the camera showed signs of frosting up toward the end of the session. [2012-03-21 09:45, HuntersHill]

· Joe Pollock has taken first run for this return binary in its current second (1st return) apparition, captured an event:
http://www.asu.cas.cz/~asteroid/07225_12_porb.png
http://www.asu.cas.cz/~asteroid/07225_12_p1.png

Covering this event once more and the other event twice, as usually, is needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-19 16.32 0.253
2012- 3-20 6.99 0.253
2012- 3-20 21.66 0.253
2012- 3-21 12.33 0.253
2012- 3-22 3.00 0.253
2012- 3-22 17.67 0.253
2012- 3-23 8.34 0.253
2012- 3-23 23.01 0.253
2012- 3-24 13.68 0.253
2012- 3-25 4.35 0.253
2012- 3-25 19.02 0.253
2012- 3-26 9.69 0.253
2012- 3-27 0.36 0.253
2012- 3-27 15.03 0.253
2012- 3-28 5.70 0.253
2012- 3-28 20.37 0.253
2012- 3-29 11.04 0.253
2012- 3-30 1.71 0.253
2012- 3-30 16.38 0.253
2012- 3-31 7.05 0.253
2012- 3-31 21.72 0.253
2012- 4- 1 12.39 0.253
2012- 4- 2 3.06 0.253
2012- 4- 2 17.73 0.253
2012- 4- 3 8.40 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-19 23.65 0.753
2012- 3-20 14.32 0.753
2012- 3-21 4.99 0.753
2012- 3-21 19.66 0.753
2012- 3-22 10.33 0.753
2012- 3-23 1.00 0.753
2012- 3-23 15.67 0.753
2012- 3-24 6.34 0.753
2012- 3-24 21.01 0.753
2012- 3-25 11.68 0.753
2012- 3-26 2.35 0.753
2012- 3-26 17.02 0.753
2012- 3-27 7.69 0.753
2012- 3-27 22.36 0.753
2012- 3-28 13.03 0.753
2012- 3-29 3.70 0.753
2012- 3-29 18.37 0.753
2012- 3-30 9.04 0.753
2012- 3-30 23.71 0.753
2012- 3-31 14.38 0.753
2012- 4- 1 5.05 0.753
2012- 4- 1 19.72 0.753
2012- 4- 2 10.39 0.753
2012- 4- 3 1.06 0.753
2012- 4- 3 15.73 0.753

Clear Skies, Petr [2012-03-19 12:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· A copy of our announcement that appeared on CBET 1233 is enclosed below. Conditions for the binary are worseing and we don't think that we would be able to obtain good further observations in the rest of this apparition, so I am closing it now.

Cheers, Petr

(7225) HUNTRESS
D. Pray, Carbuncle Hill Observatory, Greene, RI, U.S.A.; P. Pravec, P.
Kusnirak, and K. Hornoch, Ondrejov Observatory; M. Husarik, M. Pikler, and
G. Cervak, Skalnate Pleso Observatory; S. Gajdos, Modra Observatory; and F.
Colas and J. Lecacheux, IMCCE and Pic du Midi Observatory, report that
photometric observations obtained during 2007 Dec. 7 to 2008 Jan. 17 reveal
that minor planet (7225) is a binary system with an orbital period of 14.67
± 0.01 hr. The primary shows a period of 2.4400 ± 0.0001 hr, and it has
a lightcurve amplitude of 0.11 mag, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events indicate a secondary-to-primary
mean-diameter ratio of 0.21 ± 0.02.

(C) Copyright 2008 CBAT
2008 January 31 (CBET 1233) Daniel W. E. Green [2008-02-01 08:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one tonight.
Don [2008-01-29 01:52, CarbuncleHill]

· Doing a run on this tonight.
Don [2008-01-26 00:16, CarbuncleHill]

· I started this at 23:50, Jan 16 UT, in good conditions.
Don [2008-01-16 23:51, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Three more sessions joined in:
2008-01-13.2 by Don from Carbuncle Hill
2008-01-13.9 by Peter from here
2008-01-14.0 by Michal and Marek from S. Pleso.
Current solution:
P_1 = 2.43998 +/- 0.00003 h
P_orb = 14.67 +/- 0.01 h
D_2/D_1 = 0.21 +/- 0.02
A_1 = 0.11 mag
http://www.asu.cas.cz/~asteroid/07225_porb_b.png
http://www.asu.cas.cz/~asteroid/07225_porb_c.png
http://www.asu.cas.cz/~asteroid/07225_porb_b_contacts.png
http://www.asu.cas.cz/~asteroid/07225_porb_c_contacts.png
http://www.asu.cas.cz/~asteroid/07225_p1_b.png
http://www.asu.cas.cz/~asteroid/07225_p1_c.png
All but the couple ten points in the Jan 4.2 session fit well. The unusual behavior before the end of the Jan 4.2 remains unexplained/unconfirmed. Ok, since the asteroid's observing conditions are deteriorating, I think that we should prepare a CBET announcement on this one now or within a few days, after receiving additional observations by Francois of Jan. 10.9 (he plans to recalibrate them during this week).

Clear Skies, Petr [2008-01-15 12:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:20 UT. Peter K. [2008-01-13 23:27, Ondrejov] Message sent to observers

· Session started at 19:20 UT in good conditions. Michal [2008-01-13 19:23, SkalnatePleso] [Remove]

· Doing a run tonight on this.
Don [2008-01-13 05:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 19:20 UT in average conditions. Expecting short session only due to unsuitable weather preditiction. Michal [2008-01-12 19:44, SkalnatePleso] [Remove]
Message sent to observers

· Hi all and happy new year

We started at Pic du Midi at 19h30 UTC on (7225) Huntress, seeing is quite bad with a strong wind, we are not sure to have the whole night. But as it is a bright, it may work.

Francois [2008-01-10 19:39, Pic du Midi] Message sent to BinAstPhotSurvey conference

· Five more nights added to the solution, three by Don from Carbuncle Hill, one by Stefan from Modra, and one by Kamil and Peter from here. All but one of the 12 good sessions fit with following solution:
P_1 = 2.43995 +/- 0.00003 h
P_orb = 14.67 +/- 0.01 h
D_2/D_1 = 0.21 +/- 0.02
A_1 = 0.11 mag
http://www.asu.cas.cz/~asteroid/07225_all.png
http://www.asu.cas.cz/~asteroid/07225_porb.png
http://www.asu.cas.cz/~asteroid/07225_p1.png
The one "problem" session is that of Jan 4.2 where there is seen an attenuation in the last 20 points of the session that is too early. (Other 120+ points of the session fit well, so it shouldn't be a problem with recorded times.) Don sees everything all right with the data. All the other captured attenuations -three around orbital phase 0.24 and five around orbital phase 0.74 in the above plots- fit well. More data are needed to see if the anomalous attenuation occurs again, or if it remains unconfirmed. Good sessions with errors <0.02 mag are needed, don't bother in poor conditions.

Clear Skies, Petr [2008-01-10 17:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Had to end run due to equipment problems. No useable data.

Russ [2008-01-09 04:33, Shed of Science] Message sent to observers

· Just got started on 7225 Hutress at 2:15 UT, 1/09. Conditions look good for the next four hours or so, but may deteriorate after 6 UT, 1/09.

Regards,

Russ [2008-01-09 02:26, Shed of Science]

· Observing this one from 20:08 UT. Best wishes, Kamil [2008-01-08 20:57, Ondrejov] Message sent to observers

· I'm shooting through a large "sucker hole" right now. I can only hope it stays open a few hours.
Don [2008-01-08 00:53, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing it from 19:28 UT on Jan.7,2008. More faint stars are ahead, and clouds are crossing.

Stefan [2008-01-07 20:03, Modra]

· I started a run on this at 01:40 UT.
Don [2008-01-04 01:54, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don has found this one to be a binary (5 nights from Carbuncle Hill). Together with two nights by Gabo, Michal and Marek from Skalnate Pleso (they captured one event too), we get a likely solution:
P_1 = 2.43996 h (error <0.0001 h)
P_orb = 14.70 h (error ~0.02 h)
D_2/D_1 = 0.19 +/- 0.02
A_1 = 0.11 mag
http://www.asu.cas.cz/~asteroid/07225_all.png
http://www.asu.cas.cz/~asteroid/07225_porb.png
http://www.asu.cas.cz/~asteroid/07225_p1.png
More data are needed to refine the solution. As it has a relatively small D_2/D_1 -secondary events are only 0.04mag deep- good quality data with errors <0.02 mag are needed; don't bother in poorer conditions.

Congratulations, Don, on your newest binary!

Cheers, Petr [2008-01-03 17:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a session on this at 04:00 UT in clear but windy conditions.
Don [2008-01-03 04:14, CarbuncleHill]

· Observing from 19:05 UT in good conditions - expecting a long session. Michal [2008-01-02 19:11, SkalnatePleso] [Remove]
Message sent to observers

· This object observed from 19:00 UT to 02:03 UT, December 30/31. Gabo [2007-12-31 02:34, SkalnatePleso] [Remove]

· Started a run at 02:00 UT.
Don [2007-12-30 03:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.
Don [2007-12-15 04:42, CarbuncleHill]

· Don's observations from Carbuncle Hill have shown a short period with A=0.17 mag. Two full consecutive nights from one stations, or, if possible to coordinate, two overlaping sessions from a European station and Carbuncle Hill, are needed to establish a unique solution. Petr [2007-12-13 14:36, Ondrejov]

· I started a run at 02:40 UT.
Don [2007-12-09 03:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started this new target at 02:50 UT. The promised clear skies have changed to varible high, thin clouds, but still usable.
Don [2007-12-07 03:10, CarbuncleHill]

(5929) Manzano (Finished) [Add new note]
· Vladimir Benishek and Joe Pollock have observed this new target from Sopot and Perth, respectively. Unique period, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/05929.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-12-22 07:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did a run on this new target last night (Dec. 19-20, 22:18 - 01:22 UT).
Vladimir [2014-12-20 16:08, Sopot AO] Message sent to observers

· Got a short 2.5 hour run from Perth last night. Joe [2014-12-18 23:13, Dark Sky & PROMPT]

· I observed this new target over the single night: on Dec. 14-15 (23:10 – 04:48 UT). From these initial observations I found a preliminary rotation period of 3.77 hours. The lightcurve amplitude is extremely large (1.07 mag. !). The weather at my location is quite unstable, so it is uncertain when I’ll be able to continue to work this interesting object. I encourage other observers to begin observations of this target.
Vladimir [2014-12-18 14:36, Sopot AO] Message sent to BinAstPhotSurvey conference

(35364) Donaldpray (Finished) [Add new note]
· Don has done his asteroid sufficiently from Sugarloaf Mountain: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/35364.png
Object closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very good Don :-)

Cheers, Petr [2014-11-17 10:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· OK, I couldn't resist this one. I did a run last night and it's a high amplitude object. I stared another run tonight at 01:00 UT.

Don [2014-11-16 01:22, Sugarloaf]

(6755) Solovyanenko (Finished) [Add new note]
· The target is closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-11-14 12:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has taken third night from Sugarloaf Mountain, resolved the period ambiguity,
http://www.asu.cas.cz/~asteroid/06755.png
No collaboration is needed on this one now.

Cheers, Petr [2014-11-14 08:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:20 UT.
Don [2014-11-13 02:12, Sugarloaf]

· Don Pray has observed this new target from Sugarloaf Mountain on two nights. A few possible periods around 8 hours, see a composite lc for one of them:
http://www.asu.cas.cz/~asteroid/06755.png

One run from a longitude different from Don's would be good to resolve the ambiguity (which is due to the asteroid's spin near the 3:1 commensurability with Earth's rotation).

Clear Skies, Petr [2014-11-12 08:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 00:15 UT.
Don [2014-11-11 02:41, Sugarloaf]

· Started this new target at 01:10 UT.
Don [2014-10-31 01:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4678) Ninian (Finished) - slow rotator [Add new note]
· This new target was worked by Don Pray, found to be a slow rotator. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2014-11-12 09:44, Ondrejov]

· Started this slow rotator at 01:40 UT.
Don [2014-10-27 01:47, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this at 02:05 and running until 05:45 UT.
Don [2014-09-28 00:41, Sugarloaf]

· Planning to start this slow rotator at 02:30 UT.
Don [2014-09-24 01:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this new target at 02:30 UT.
Don [2014-09-23 01:01, Sugarloaf]

(16635) 1993 QO (Finished) - return 3-period system [Add new note]
· Target closed, more data needed in future apparition. Petr [2014-11-04 13:36, Ondrejov]

· I started this at 23:55 UT, Oct 17.
Don

Note: The start day was Oct 17, not 18 as previously stated.. [2014-10-18 00:10, Sugarloaf] Message sent to observers

· Observing from 21:00 UT. Gabo [2014-10-05 20:51, SkalnatePleso] [Remove]

· Today started at 19:10 UT. Gabo [2014-10-04 19:14, SkalnatePleso] [Remove]
Message sent to observers

· Started observing at 21:10 UT. Gabo [2014-10-02 21:19, SkalnatePleso] [Remove]

· Observing from 18:10 UT but high clouds are comming. Peter K. [2014-09-29 20:40, Ondrejov] Message sent to observers

· Events in this 3-period system have been observed well for this lunation from Sugarloaf Mountain and here:
http://www.asu.cas.cz/~asteroid/16635_2014b_porb.png
http://www.asu.cas.cz/~asteroid/16635_2014b_p1.png
http://www.asu.cas.cz/~asteroid/16635_2014b_p2.png
http://www.asu.cas.cz/~asteroid/16635_2014a_porb.png
http://www.asu.cas.cz/~asteroid/16635_2014a_p1.png
http://www.asu.cas.cz/~asteroid/16635_2014a_p2.png

Further monitoring in the next lunation (data with errors < 0.02 mag only) would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-11 14.26 0.260
2014-10-12 22.51 0.260
2014-10-14 6.76 0.260
2014-10-15 15.01 0.260
2014-10-16 23.26 0.260
2014-10-18 7.51 0.260
2014-10-19 15.76 0.260
2014-10-21 0.01 0.260
2014-10-22 8.26 0.260
2014-10-23 16.51 0.260
2014-10-25 0.76 0.260
2014-10-26 9.01 0.260
2014-10-27 17.26 0.260
2014-10-29 1.51 0.260
2014-10-30 9.76 0.260
2014-10-31 18.01 0.260
2014-11- 2 2.26 0.260
2014-11- 3 10.51 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-12 6.31 0.758
2014-10-13 14.56 0.758
2014-10-14 22.81 0.758
2014-10-16 7.06 0.758
2014-10-17 15.31 0.758
2014-10-18 23.56 0.758
2014-10-20 7.81 0.758
2014-10-21 16.06 0.758
2014-10-23 0.31 0.758
2014-10-24 8.56 0.758
2014-10-25 16.81 0.758
2014-10-27 1.06 0.758
2014-10-28 9.31 0.758
2014-10-29 17.56 0.758
2014-10-31 1.81 0.758
2014-11- 1 10.06 0.758
2014-11- 2 18.31 0.758

Clear Skies, Petr [2014-09-29 12:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started now, but clouds are coming. Zuzana [2014-09-28 19:02, SkalnatePleso] [Remove]
Message sent to observers

· I started a run at 00:15 UT and hope to catch the 0.258 phase event.
Don [2014-09-20 00:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 00:35 UT.
Don [2014-09-19 00:35, Sugarloaf] Message sent to observers

· Observing from 18:45 UT but awaiting clouds later tonight. Peter [2014-09-18 19:25, Ondrejov]

· Started this one at 00:10 UT and should capture the entire 0.761 phase event.
Don [2014-09-18 00:23, Sugarloaf] Message sent to observers

· I observed from 22:15 UT. Gabo [2014-09-17 22:20, SkalnatePleso] [Remove]

· Started a run at 00:50 UT.
Don [2014-09-17 01:13, Sugarloaf]

· Started this at 01:30 UT.
Don [2014-09-15 03:28, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started from 22:45 UT, but a bad conditions this night. Gabo [2014-09-12 23:10, SkalnatePleso] [Remove]
Message sent to observers

· This 3-period system has been observed thoroughly by Don Pray from Sugarloaf Mountain and by us from Sierra Nevada Observatory and Ondrejov in the first lunation of its current (1st post-discovery) apparition:
http://www.asu.cas.cz/~asteroid/16635_2014_porb.png
http://www.asu.cas.cz/~asteroid/16635_2014_p1.png
http://www.asu.cas.cz/~asteroid/16635_2014_p2.png

More data for all the lightcurve components are needed in the upcoming lunation. Below is an event ephemeris, but don't limit your observations to around those times only. Very good quality (errors < 0.02 mag) are needed; don't bother if you cannot get such data quality.

Date/Time UTC (LTc.) Phase
--------------------------
2014- 9-12 0.70 0.258
2014- 9-13 8.95 0.258
2014- 9-14 17.20 0.258
2014- 9-16 1.45 0.258
2014- 9-17 9.70 0.258
2014- 9-18 17.95 0.258
2014- 9-20 2.20 0.258
2014- 9-21 10.45 0.258
2014- 9-22 18.70 0.258
2014- 9-24 2.95 0.258
2014- 9-25 11.20 0.258
2014- 9-26 19.45 0.258
2014- 9-28 3.70 0.258
2014- 9-29 11.95 0.258
2014- 9-30 20.20 0.258
2014-10- 2 4.45 0.258
2014-10- 3 12.70 0.258
2014-10- 4 20.95 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2014- 9-12 16.94 0.761
2014- 9-14 1.19 0.761
2014- 9-15 9.44 0.761
2014- 9-16 17.69 0.761
2014- 9-18 1.94 0.761
2014- 9-19 10.19 0.761
2014- 9-20 18.44 0.761
2014- 9-22 2.69 0.761
2014- 9-23 10.94 0.761
2014- 9-24 19.19 0.761
2014- 9-26 3.44 0.761
2014- 9-27 11.69 0.761
2014- 9-28 19.94 0.761
2014- 9-30 4.19 0.761
2014-10- 1 12.44 0.761
2014-10- 2 20.69 0.761
2014-10- 4 4.94 0.761

Clear Skies, Petr [2014-09-08 11:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:40 UT and hope to catch the 0.251 phase event.
Don [2014-09-05 02:36, Sugarloaf] Message sent to observers

· I observed this one 03/04 Sept from 21.9 UT to 1.5 UT.
Vasilij Ch. [2014-09-04 02:41, Kharkiv]

· Started this one at 00:40 UT.
Don [2014-09-04 00:42, Sugarloaf] Message sent to observers

· I started this at 00:50 UT.
Don [2014-09-02 00:50, Sugarloaf]

· I started a run at 01:10 UT, and should catch the 0.751 phase event.
Don [2014-08-30 01:55, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray has taken the first three nights for this return binary in its current 2nd apparition (the first after the discovery apparition of 2007!). As before, there are three lightcurve components, two rotational and one eclipse:
http://www.asu.cas.cz/~asteroid/16635_2014_porb.png
http://www.asu.cas.cz/~asteroid/16635_2014_p1.png
http://www.asu.cas.cz/~asteroid/16635_2014_p2.png

More data are needed for the events as well as outside them (to nail down the P_2 lightcurve component); event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 8-29 13.98 0.251
2014- 8-30 22.23 0.251
2014- 9- 1 6.48 0.251
2014- 9- 2 14.73 0.251
2014- 9- 3 22.98 0.251
2014- 9- 5 7.23 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2014- 8-30 6.09 0.751
2014- 8-31 14.34 0.751
2014- 9- 1 22.59 0.751
2014- 9- 3 6.84 0.751
2014- 9- 4 15.09 0.751
2014- 9- 5 23.34 0.751

Clear Skies, Petr [2014-08-29 07:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 01:10 UT.
Don [2014-08-29 01:21, Sugarloaf]

· Plan to start this at 01:30 UT.
Don [2014-08-27 00:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 02:40 UT.
Don [2014-08-20 03:00, Sugarloaf]

(2110) MooreSitterly (Finished) - NEOSource Target (paired asteroid) [Add new note]
· Target completed for this apparition, going to update model. Petr [2014-10-31 11:12, Ondrejov]

· Observing tonight starting at 09:30 UT and should be a 6 hours run. [2014-10-18 09:41, Blue Mountains Obs] Message sent to observers

· observing tonight. condition is good. Starting from 12UT and should finish it at 16UT [2014-10-02 13:04, Blue Mountains Obs]

· observed from 14:36 to 19:50 UT 07/24. Good data but some scatters due to wind. [2014-07-24 22:56, Blue Mountains Obs] Message sent to observers

· observed on 0708 from 14 UT for 6 hours. windy condition but moon is mostly out of the way [2014-07-08 23:25, Blue Mountains Obs]

· Got a 5.75 hour run from Prompt last night under good conditions for this object on the Current Targets list. Joe [2014-06-22 18:58, Dark Sky & PROMPT] Message sent to observers

· Target completed for this apparition:
http://www.asu.cas.cz/~asteroid/002110_1303.png
http://www.asu.cas.cz/~asteroid/002110_1304.png
We are going to attempt its modeling.

Cheers, Petr [2013-04-05 06:59, Ondrejov]

· This paired asteroid was observed sufficiently from here and by Don Pray from Sugarloaf Mountain for this lunation:
http://www.asu.cas.cz/~asteroid/002110_b3.png

Taking one more lightcurve in April will be useful for future spin modeling.

Clear Skies, Petr [2013-03-12 09:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this for almost 4 hours last night.
Don [2013-03-10 14:18, Sugarloaf]

· After 2 weeks, the sky has cleared (more or less).
I'm doing a run on this in the time before I start 4765.
Don [2013-03-09 01:25, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This paired asteroid was done in the second apparition well:
http://www.asu.cas.cz/~asteroid/002110_b0.png

Nice work, guys.

Cheers, Petr [2010-05-27 12:13, Ondrejov]

· Observed tonight, 22:00-0:30 UT. Jozef [2010-04-12 02:03, Modra]

· Will run from SRO again tonight. -Walt [2010-04-10 01:59, Sonoita] Message sent to observers

· Just started a run. With luck we have a continuous light curve depending on how long you have been able to run tonight Stefan.

-Walt [2010-04-09 03:04, Sonoita]

· Observing it from 20:06 UT.

Stefan [2010-04-08 20:08, Modra] Message sent to observers

· Working from SRO tonight. -Walt [2010-04-08 02:40, Sonoita]

· I will be observing this one tonight. Best wishes, Kamil [2010-04-06 18:47, Ondrejov]

· Plan to start a second run on this at 03:00 UT.
Don [2010-03-25 02:33, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This asteroid is a brighter member (primary) of the asteroid pair 2110-44612. Their distances in osculating and proper elements are
d = 11.9223 +/- 0.0051 m/s
d_prop = 4.68 m/s
and a probability that it is a coincidental pair of two genetically unrelated asteroids is
P_2/N_p = 0.0022
So, it is a significant, secure pair.

Adrian has taken three nights for it and established its rotation period of 3.344 h and amplitude of 0.39 mag,
http://www.asu.cas.cz/~asteroid/002110.png
It is consistent with our working hypothesis. A summary line with the result has been put to
http://www.asu.cas.cz/~ppravec/newres.htm

Fyi, I and David Vokrouhlicky plan to finish our work on the pair significances paper during following weeks. After it is submitted, we will look at what lightcurve data for paired asteroids we have then and what they reveal.

Happy New Year!

Cheers, Petr Pravec [2009-01-05 10:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Sorry, I forgot to mention earlier that this object is finished. My observations lead to P ~ 3.3440 +/- 0.0002 h, A ~ 0.39 mag. Data were sent to Petr and Peter a minute ago. Adrian [2008-12-29 07:57, Modra] Message sent to observers

· Starting this after 9617 for the remainder of the night.
Don [2008-12-29 02:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Clouds and background stars caused I should stop 76818. Now clouds are over for a while and I can finish 2110 perhaps. Adrian [2008-12-25 19:20, Modra] Message sent to observers

· Maybe I can try this tonight. However, some background stars are around. Asteroid designation should be written slightly different. Adrian [2008-12-23 18:11, Modra] Message sent to BinAstPhotSurvey conference

(8928) 1996 YH2 (Finished) [Add new note]
· Don Pray has observed this new target from Sugarloaf Mountain on three nights. There is an ambiguity on how many maxima/minima are there, but otherwise the solution is good and the coverage is sufficient, no deviation seen.
http://www.asu.cas.cz/~asteroid/08928.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Don.

Petr [2014-10-28 16:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 01:35, but clouds may cause problems.
Don [2014-10-27 01:45, Sugarloaf]

· Started this new target at 02:00, Oct 20 UT.
Don [2014-10-20 15:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

1717 Arlon (Finished) - return binary, 2nd apparition - waiting for completing reduction of PROMPT data [Add new note]
· Began a run from Prompt Tololo at 0000 UT. Hope to get about 5 hours. Joe [2014-10-25 01:16, Dark Sky & PROMPT] Message sent to observers

· Began a run from Prompt Tololo at 0000 UT. Hope to get about 5 hours. Joe [2014-10-24 02:47, Dark Sky & PROMPT]

· Observed tonight from 0930UT. Should be a 6hours run. [2014-10-18 09:39, Blue Mountains Obs] Message sent to observers

· Began a run from Prompt Tololo at 2350 UT. Hope to get about 6 hours. Joe [2014-10-14 04:40, Dark Sky & PROMPT]

· Began a run from Prompt Tololo at 2350 UT. Hope to get about 6 hours and cover part of the secondary centered at 2248 UT [2014-10-12 23:55, Dark Sky & PROMPT] Message sent to observers

· Joe Pollock's great effort with Prompt and Perth telescopes so far:
http://www.asu.cas.cz/~asteroid/01717_2014b_porb.png
http://www.asu.cas.cz/~asteroid/01717_2014b_p1.png
http://www.asu.cas.cz/~asteroid/01717_2014b_p2.png
http://www.asu.cas.cz/~asteroid/01717_2014a_porb.png
http://www.asu.cas.cz/~asteroid/01717_2014a_p1.png
http://www.asu.cas.cz/~asteroid/01717_2014a_p2.png

Taking last data for the events (as well as for the rotational components) in the next lunation would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-11 14.6 0.280
2014-10-16 13.4 0.280
2014-10-21 12.2 0.280
2014-10-26 11.0 0.280

Date/Time UTC (LTc.) Phase
--------------------------
2014-10-13 22.8 0.754
2014-10-18 21.6 0.754
2014-10-23 20.4 0.754
2014-10-28 19.2 0.754

Clear Skies, Petr [2014-10-03 08:13, Ondrejov]

· Began a run from Prompt Tololo at 2340 UT. Hope to get about 8 hours and cover the secondary centered at 0324 UT. Joe [2014-09-23 23:51, Dark Sky & PROMPT] Message sent to observers

· Plan to start run at 0000 UT from Prompt Tololo. Hope to get at least part of the secondary event not yet seen. Joe [2014-09-18 23:12, Dark Sky & PROMPT]

· Began a run from Prompt Tololo at 2340 UT. Hope to get about 8 hours. Joe [2014-09-16 02:43, Dark Sky & PROMPT] Message sent to observers

· Began a run from Prompt Tololo at 2340 UT. Hope to get about 8 hours. Joe [2014-09-15 00:06, Dark Sky & PROMPT]

· Joe Pollock got excellent data for this one in its current apparition so far:
http://www.asu.cas.cz/~asteroid/01717_2014_porb.png
http://www.asu.cas.cz/~asteroid/01717_2014_p1.png
http://www.asu.cas.cz/~asteroid/01717_2014_p2.png

More data are needed. An event ephemeris (tentative only for the "0.75-phase" one):

Date/Time UTC (LTc.) Phase
--------------------------
2014- 9-16 17.2 0.265
2014- 9-21 15.2 0.265
2014- 9-26 13.2 0.265
2014-10- 1 11.2 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2014- 9-14 7.4 0.775
2014- 9-19 5.4 0.775
2014- 9-24 3.4 0.775
2014- 9-29 1.4 0.775

Clear Skies, Petr [2014-09-08 10:47, Ondrejov]

· Began a run from Prompt Tololo at 0050 UT. Hope to get about 9 hours. Joe [2014-08-29 02:15, Dark Sky & PROMPT] Message sent to observers

· Began a run from Prompt Tololo at 0220 UT. Hope to get about 7 hours. Joe [2014-08-27 02:32, Dark Sky & PROMPT]

· Began a run from Prompt Tololo at 0340 UT. Hope to get about 5.5 hours. Joe [2014-08-26 03:43, Dark Sky & PROMPT] Message sent to observers

· Began a run from Prompt Tololo at 0000 UT. Hope to get about 9.5 hours. Joe [2014-08-25 01:10, Dark Sky & PROMPT]

· Began a run from Prompt Tololo at 0015 UT. Hope to get about 9.5 hours. Joe [2014-08-21 02:16, Dark Sky & PROMPT] Message sent to observers

· Began a run from Prompt Tololo at 0030 UT. Hope to get about 9.5 hours. Joe [2014-08-19 00:38, Dark Sky & PROMPT]

· Began a run from Prompt Tololo at 0100 UT. Hope to get about 9 hours. Joe [2014-08-18 02:08, Dark Sky & PROMPT] Message sent to observers

· CBET 504 with our announcement this one has appeared on May 6. I'm enclosing it below for your convenience, and I will add a link to it on our web pages as well.

Cheers, Petr

(1717) ARLON
W. Cooney, J. Gross, and D. Terrell, Sonoita Research Observatory,
Sonoita, AZ; P. Pravec and P. Kusnirak, Ondrejov Observatory; D. Pray,
Carbuncle Hill Observatory, Greene, RI; Yu. Krugly, Kharkiv Observatory;
L. Kornos, J. Vilagi, S. Gajdos, and A. Galad, Modra Observatory;
V. Reddy, Department of Space Studies, University of North Dakota,
Grand Forks; R. Dyvig, Quinn, SD; S. Nudds, Elginfield Observatory,
University of Western Ontario; and Z. Kanuchova, M. Pikler,
and M. Husarik, Skalnate Pleso Observatory, report that photometric
observations obtained during Feb. 24-Apr. 17 confirm that the system is
binary. Mutual events (satellite occultation and eclipse behind the
primary, as well as transits of the satellite and its shadow over the
primary) were observed to be repeating with a synodic orbital period of
117.0 hr. The two linearly additive components with periods of 5.148
and 18.23 hr (initially reported on CBET 369) are still present, and
they are interpreted as rotation lightcurves of the components of the
binary system. Depths of the observed attenuations put a lower limit
on a secondary-to-primary mean-diameter ratio of 0.5.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 May 6 (CBET 504) Daniel W. E. Green [2006-05-12 14:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· A quick info on Ds/Dp estimation: The data don't resolve directly which one of the two additive rotation components (5.148 and 18.23 h) belongs to the primary. Though we might assume that the shorter one is that of the primary, there is not a direct evidence for it. (Indirect evidence may be found through a detailed modeling later on, or it may be constrained with another technique.) A lower limit on Ds/Dp is 0.5.

Cheers, Petr [2006-04-26 11:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Last pieces of data included:
Linkage of the Ondrejov data by Peter K. here; they fit well to within 0.01 mag (and confirm that the single short suspicious session of 03-22.9 was affected by a star).
Linkage of two Modra nights (one in an event) by Adrian.
Two additional short sessions by Walt, John and Dirk from SRO, covering the 0.27-phase event. It fits well with the 117.0-h period (a variation due to synodic effect is on the order of 0.1 h). Its depth, however, decreased significantly; compare following two pictures:
http://www.asu.cas.cz/~ppravec/arlon_apr12_17_porb.png
http://www.asu.cas.cz/~ppravec/arlon_feb_apr_porb.png
They are useful data for further modeling.

I'm going to estimate Ds/Dp. We will draft out a circular announcing the detection of mutual events and the estimation of Porb and Ds/Dp shortly.

Cheers, Petr [2006-04-26 09:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· We started a run on this at 3:45 UT.

John G [2006-04-12 04:46, Sonoita]

· Analysis of the data from 2006-02-24 to 04-05 has showed that the orbital period estimate of 117.1 h is well established, see
http://www.asu.cas.cz/~ppravec/arlon_feb_apr_porb.png
There is just one short unfitting session of 2006-03-22.9 (around orbital phase 0.1 in the above picture) that is considered to be in error due to suboptimal conditions (but it will be checked with an accurate linkage). All other sessions fit well. Two pairs of events (occultation followed by eclipse, or vice versa) per orbital period were observed. The event of phase 0.28 was covered partially on nights of 02-27.4 (SRO) and 03-04.1 (Carbuncle). The event of phase 0.35 was covered well on 03-19.2 (SRO), and partially on 03-24.2 (SRO), 03-29.1 (Carbuncle), and 04-02.9 (Modra). The event of phase 0.70 was covered well on 03-20.9/21.1 (Ondrejov+Carbuncle), and partially on 03-06.3 (SRO), and 03-25.8 (Kharkiv). The event of phase 0.77 was covered well on 03-31.1 (Carbuncle). Other data have constrained the solution as well.

Covering the events again during a rest of the asteroid's apparition will be progressively more difficult because of its decreasing solar elongation. For example, it will be observable from Ondrejov or Modra for less than 3 hours only in evening sky after mid-April. It means that we may get only incomplete events, but even such would be useful to further constrain its orbit. An extrapolation gives a following prediction for a next set of events:
Date UT OrbPhase
2006 Apr. 12.30 0.28
2006 Apr. 12.64 0.35
2006 Apr. 14.35 0.70
2006 Apr. 14.69 0.77
We cannot predict now how the events will evolve, in phase, duration, or amplitude, but in any case the events seen during the past two lunations were 3+ h long and the predicted times may not be quite accurate as well, so if you go after them, covering also times a bit before or after the predicted times would make sense. Good luck for the rest of the apparition! We'll publish an announcement in a circular after it is over.

Cheers, Petr [2006-04-06 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006-03-30.1 by Shannon from Elginfield
2006-03-31.3 and 04-02.2 by Walt, John and Dirk from SRO
2006-04-01.1, 03.1, and 05.1 by Don from Carbuncle Hill
2006-04-02.9 by Stefan and Jozo from Modra.
The data fit well with the 117.2-h orbital period.
The short run by Stefan and Jozo is right in the deep event (around orbital phase of 0.35 in the 4th picture below), showing a decreasing branch exactly as expected; I hope that you will be able to link it with your previous data so that the short run may really contribute to refining the period, Adrian. Current solution with data of this lunation see following pictures:
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_all.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_shortpc.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_p3.png
I will check a uniqueness of the solution, also together with data from the previous lunation. A quick check shows that all but one short session of the previous lunation fits well, so it looks promissing .... Ok, more later. The Moon is probably too close to the asteroid for the next two nights, but I will suggest if/how we go on with this one for the rest of its apparition in a couple days.

Cheers, Petr [2006-04-05 16:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 00:10, Apr 5 UT. May be a shortened run depending on clouds headed this way.

Don [2006-04-05 00:22, CarbuncleHill]

· Started at 00:00, Apr 3 UT.

Don [2006-04-02 23:53, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started run at 3:00 UT 060402.

John G [2006-04-02 03:35, Sonoita]

· New data joined in:
2006-03-29.8 by Leos and Jozo from Modra
2006-03-29.9 by Peter K. from here
2006-03-30.1 and 31.1 by Don from Carbuncle Hill
2006-03-30.2 by Walt, John and Dirk from Sonoita
An almost complete event caught in the last night by Don. The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_all.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_shortpc.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_p3.png
The orbital period of ~117.2 h there is still rather tentative. (Another possibility of 58.65 h appears to be ruled out now.) The data of the previous lunation are mostly in agreement, but I will need to look at it more later in the next week. Fyi, the two successive events around orbital phases of 0.70 and 0.77 in the 4th picture above are an occultation followed by an eclipse (or vice versa) that are spatially separated in the relatively wide system observed at the solar phase of 28 degrees. We will see whether the solution holds with further data. As you can see in the 4th picture above, the coverage of the orbital period is still rather incomplete, so it will be interesting to see what occurs there during following nights.

Cheers, Petr [2006-03-31 17:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Had to wait until 4:45 060331 UT. for sky to clear. We are running now. Hopefully the clouds will hold off until the run is finished.

John G [2006-03-31 04:59, Sonoita]

· Started at 00:15, Mar 31 UT.

Don [2006-03-31 00:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 1:20, Mar 30 UT.

Shannon
Elginfield Observatory, London Ontario, Canda [2006-03-30 02:42, Elginfield]

· Starting at 00:00, Mar 30 UT.

Don [2006-03-29 23:53, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006-03-20.8 and 25.8 by Yura from Kharkiv Observatory
2006-03-27.1, 28.1 and 29.1 by Don from Carbuncle Hill.
There have been caught events by Yura on 03-25.8 and by Don on 03-29.1. See
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_all.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_shortpc.png

The data are beginning to show something. The three deep events of 03-19.2, 24.2, and 29.1, as well as the two shallower events of 03-20.9 and 25.8 appear to repeat at an interval of ~4.88 d=117.2 h. It is not clear yet whether it is a true period, or some integer muptiple of it, but shapes of the five events are reproduced well for the period of 117.2 h as well as a half of it (58.6 h). In following picture, I've folded the data with the 58.6-h period:
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_p3.png

Ok, such solution would correspond to an eccentric orbit; that is possible for such a bit wider, unsynchronous system, but we need to work on it more to explain it better. A sixth possible (much shallower) event of 03-22.9 (dark green points in the above picture) is not explained yet; we shall see if it turns real after an accurate linkage. A quick check of the (poorer) data from the previous lunation indicates that there remain some unexplained things as well, perhaps caused by changing geometry of the system, but nevertheless we have to work more on it. It is still very needed to work this one thoroughly. I hope more US stations can join Don (extending his sessions to the west, or substituting him on nights when he is clouded out, and that our weather improves soon here in the Central Europe so that it can be covered from Ondrejov, Modra, or Skalnate Pleso, or that Gianluca can substitute us there from Italy on some nights where we are clouded out. Yura's observations from Kharkiv (where he has a different weather pattern, and they also extend the coverage further to the east) would be very useful as well.

Cheers, Petr [2006-03-29 18:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a little past 00:00, Mar 29 UT.

Don [2006-03-28 23:45, CarbuncleHill]

· Started at 00:30, Mar 28.

Don [2006-03-28 00:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· The ocean storm is finally departing. Started a run around 08:00, Mar 27 UT.

Don [2006-03-27 02:07, CarbuncleHill]

· New data joined in:
2006-03-21.9 by Marek Husarik et al. from Skalnate Pleso
2006-03-22.9 by Peter K. from here
2006-03-23.1 by Don from Carbuncle Hill
2006-03-23.2 and 24.2 by Walt, John and Dirk from SRO
The session by Peter K. and the last session from SRO both cover a part of an event (though the Peter's one will need to be confirmed after linkage data are obtained), see
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_all.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_shortpc.png

No single period that would explain all detected events found so far. We are still missing some key piece in the puzzle ....

Ok, glad to hear, Yura, that you have observed it as well from Kharkiv Observatory on the past night. I'll look forward to joining in your data.

Petr [2006-03-26 16:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Asteroid was observed from 17 to 21 UT.
Yurij [2006-03-25 22:59, Kharkiv]

· We are doing Arlon tonight. Started at 3:30 060324.

John G [2006-03-24 03:51, Sonoita] Message sent to BinAstPhotSurvey conference

· Started at 00:15, Mar 23UT. Clear now, but uncertain next few hours.

Don [2006-03-23 00:16, CarbuncleHill]

· I'll start observing at 19:20 UT when it moves away from a background star and expecting full-run until 0 UT. Peter K. [2006-03-22 18:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run through variable clouds at 01:20, Mar 22 UT. May be useless, but you never know.

Don [2006-03-22 01:23, CarbuncleHill]

· Don's data of 2006-03-21.1 have indeed covered an end of the last night's event; see:
http://www.asu.cas.cz/~ppravec/arlon_longpc_newestdata.png

Cheers, Petr [2006-03-21 15:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006-03-19.2 by Walt, John and Dirk from SRO
2006-03-20.2 by Don from Carbuncle Hill
2006-03-20.9 by Peter K. from here.
There are two events caught; Walt, John and Dirk caught almost an entire attenuation 0.31-mag deep around 03-19.2, and Peter K. has caught a part -probably about 2/3- of another one (0.22-mag deep) in the second half of his session around 03-20.95. See
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_all.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_mar_apr_shortpc.png
If Don has indeed started around 0h UT (right at the time when Peter's data end), he should have covered the rest -about last third- of the attenuation.

I am going to analyze the data more to see if we can already constrain Porb. In any case, the concentrated effort turns out to be very fruitful. I encourage all who can to continue. Well, I'm affraid that our weather will be poor tonight, so if another European station (Gianluca, Yura, or Nelya?) could substitute, it would be great.

Cheers, Petr [2006-03-21 09:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 18:30 UT to 0 UT. No event seen. Peter K. [2006-03-21 03:56, Ondrejov]

· I'll be starting this around 00:00, Mar 21 UT.

Don [2006-03-20 23:49, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Lenka Sarounova (colleague from another department here at Ondrejov) observed on the last night here and covered Arlon. Her data fit well, no event seen:
http://www.asu.cas.cz/~ppravec/arlon_longpc_newestdataonly.png

It should be covered again tonight, both Ondrejov and Modra have a good forecast.

Cheers, Petr [2006-03-20 14:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by Don from Carbuncle Hill (3 nights of 2006-03-17.1 to 19.1) and by Walt, John and Dirk from SRO (1 night of 03-18.2, usefully overlaping with the Don's session taken earlier on that night) fit well, no event detected in the data covering 15+ hours, see
http://www.asu.cas.cz/~ppravec/arlon_feb_mar_all.png
http://www.asu.cas.cz/~ppravec/arlon_feb_mar_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_feb_mar_shortpc.png
http://www.asu.cas.cz/~ppravec/arlon_longpc_newestdataonly.png

I hope Peter K. here at Ondrejov and/or folks at Modra will be able to join the resumed campaign on this binary soon, since extending the coverage in longitude with observations from Europe is needed. Weather forecast is moderately favorable here for a few next nights, so we will see.

Cheers, Petr [2006-03-20 07:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting late at 02:30, Mar 20 UT. Clouds finally moved out.

Don [2006-03-20 03:29, CarbuncleHill]

· Working on this from SRO tonight. Started run at 3:15 UT.

John G [2006-03-19 03:40, Sonoita] Message sent to BinAstPhotSurvey conference

· I'll be starting this around 00:00 Mar 19 UT.

Don [2006-03-18 23:41, CarbuncleHill]

· Working from SRO tonight. Clouds may stop us early.

-Walt [2006-03-18 04:07, Sonoita] Message sent to BinAstPhotSurvey conference

· I started a run at 23:50, Mar 17 UT. [2006-03-17 23:54, CarbuncleHill]

· Doggedly pressing on, I started a run on this at 00:00, Mar 17 UT.

Don [2006-03-17 00:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'm here for a couple hours now, looking at data you have obtained while I was away. Very good work on 1717 Arlon, but its orbital period is unclear yet. In following picture, I have folded the data with a period of 48 hours (not Porb):
http://www.asu.cas.cz/~asteroid/arlon_3p.png
to show you how the events look (the deepest one is 0.27 mag, suggesting Ds/Dp of 0.5 or greater), and also to show you that they have been covered rather incompletely yet. We would need to catch them again (a few more times ?), also needed to test some assumptions in solution with more events then. So, I encourage you to resume the campaign after the Moon is away. Very needed will be also to observe it from Europe, not just from America, to get a better temporal coverage, also to break a possible commensurability with 1 day.

Cheers, Petr [2006-03-09 15:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Three new datasets were joined in:
2006-3-5.3 and 2006-3-6.3 from SRO (Walt Cooney),
2006-3-7.1 from Carbuncle Hill (Donald Pray)
and Sonoita is 'a winner' ;-) They caught an event on both last nights! See: http://www.asu.cas.cz/~asteroid/01717.png

Now we have 4 events observed (3x Sonoita Obs. and 1x Don Pray) and are able to do first estimate for P_orb. Petr will do better analysis, but my rough estimate for P_orb at this moment is ~48 hours. If it is correct, we have observed the primary event (deeper ones) for two-times as well as the secondary event. But let's wait for Petr's final word.

1717 is too close to the Moon now but I'm expecting more follow-up observations in the next lunation.

Great work all! [2006-03-08 12:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm planning to start the run at 23:45, Mar 7 UT. Hopefully, the moon will allow it.

Don [2006-03-07 22:29, CarbuncleHill]

· Two new datasets obtained by Don Pray (2006-3-5.1 and 2006-3-6.1) were joined in. They show nothing unusual, fit nicely with others and cover some missing parts in long period component, see http://www.asu.cas.cz/~asteroid/01717.png

We need more data to confirm "event(s)" seen in last days but there is a problem with waxing Moon already. Tonight it should be the last night but work it only if your errors will be 0.03 mag or less. Good luck! [2006-03-07 13:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run at 00:20, Mar 7 UT.

Don [2006-03-07 00:33, CarbuncleHill]

· Started run tonight at 3:55 UT through thin clouds.

John G [2006-03-06 06:53, Sonoita] Message sent to BinAstPhotSurvey conference

· Started run at 00:00, Mar 6 UT. [2006-03-06 00:52, CarbuncleHill]

· New data obtained by Don Pray (2006-3-4.1) were joined in. There is an indication for part of another event but Don's run was fragmented by clouds and bright background star, unfortunately, so it's hard to say at what level we can trust it. He will check the part with 'an event' again.

Peter K. [2006-03-05 11:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start run at 23:45 Mar 4 UT.

Don [2006-03-04 22:30, CarbuncleHill]

· Run on 3-03-04 not useful due to background stars.

Russ [2006-03-04 16:07, Shed of Science] Message sent to BinAstPhotSurvey conference

· Run cut short after an hour by clouds.

Don [2006-03-04 02:29, CarbuncleHill]

· I started on this at 00:05 UT, March4.

Don [2006-03-04 00:06, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· New data from Badlands Obs. (2006-3-3.2), as well as that from Don Pray and Walt Cooney mentioned in my previous message, were joined in.

Now we are able to fit at least short period with requested accuracy and substract it from second component. The best fit for the short period is 5.1502 h now and all deviations, except the 'event' in 2006-2-27.4 data, are absorbed in this new solution, see http://www.asu.cas.cz/~asteroid/01717.png

Please, note the long period is still fixed on its value from Dec./Jan. period.

Peter K. [2006-03-03 17:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· This is only to let you know that we have new observations obtained by Don Pray (2006-3-2.1, 7.1-hour long but fragmented due to background stars) and by Walt Cooney (2006-3-2.3, 2.1-hour long run) but there is no evidence for another event in these new data.

More data are needed to be able to fit its long period again as well as to catch another event. Good luck!

Peter K. [2006-03-03 15:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· It cleared last night and we were able to get a few hours of data. Should get another run tonight starting around 5 hours UT tonight.

Clearest skies,
Walt [2006-03-03 03:22, Sonoita]

· New data from 2 night were joined in:
2006-03-01.1 by Don Pray, CarbuncleHill
2006-03-02.0 by me at Ondrejov

They fit good except small deviations (~0.05 mag) at the beginning and the end of that nights. These deviations are probably caused by changed geometry and LC-shape but maybe also part of the events. For resolving that more observations are needed. The 18-hours period is only sparse covered at this moment, see http://www.asu.cas.cz/~asteroid/01717.png -- only Feb./Mar. data are plotted (in comparision with the fit from Dec./Jan. datasets).

Peter K. [2006-03-02 02:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started the observing run at 02:30 am UT ..should get 4-5 hours of data.
Vishnu & Ron [2006-03-02 02:26, Vishnu Reddy/Tucson]

· Observing from 20:10 UT and expecting full-night run under less than perfect conditions (passing clouds from time to time).

Peter K. [2006-03-01 23:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be picking this up around 00:00, Mar2 UT. [2006-03-01 21:41, CarbuncleHill]

· Observing from 20:10 UT and expecting full-night run under less than perfect conditions (passing clouds from time to time).

Peter K. [2006-03-01 21:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:25, Mar 1 UT.

Don [2006-03-01 00:26, CarbuncleHill]

· Data of the 2nd night of the resumed campaign on Arlon by Walt, John and Dirk from Sonoita have revealed a prominent event, see
http://www.asu.cas.cz/~ppravec/arlon_longpc_060227.png
It needs to be confirmed on another night, and a few more detections of the events will be needed to derive Porb (that is different from P2=18.23 h, as the same phases of P2 have been covered on the 1st SRO night three nights ago, with no event present there). So, it appears to be a fully unsynchronous binary; the secondary's rotation is not synchronized with the orbital motion. This one should be a priority for all who can work it. As we have just finished the Don's 9617 (an announcement for CBET is being written now), and the David's 17260 is nearly done as well (just one more good coverage of its secondary event is needed to complete its discovery phase), there are not many things to compete with 1717 Arlon within the BinAstPhotSurvey now. Note that it has H=12.3 ±0.2 per our measurements, i.e., it is brighter by ~0.6 mag than the ephemeris with the crude value of H=12.9 by the MPC, so it should be V~15.1 tonight. Well in reach even for small telescopes. Given the large size of the secondary -the attenuation is >0.25-mag deep- observations with errors as high as 0.03 mag are OK; now the accuracy doesn't need to be so high as we required during the Dec-Jan lunation when we aimed to deconvolve the rotational components. So, I hope many of you will be able to help out with this one so that more events are caught and Porb is derived before the asteroid's observing conditions deteriorate.

Remember to send your data to Peter K. here (peter@asu.cas.cz) as he will be joining them all together while I am away. When a couple more events are caught, he will let me know and I will come to attend to the data then to derive Porb; Peter can analyse data with two periods, but three periods will need me, I think :-)

Cheers, Petr [2006-02-28 16:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Checking for attenuations now that geometry has changed a bit. Will run tonight if skies allow. Got a single night a couple of nights ago. Per Petr, that data fits with additive component model. No attenuation seen so far.

-Walt [2006-02-27 02:13, Sonoita] Message sent to BinAstPhotSurvey conference

· Our report on this probable binary has appeared on CBET 369. I have put a note on it on
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
and I'm enclosing the text of the CBET below.

Cheers, Petr

(1717) ARLON
W. Cooney, J. Gross, and D. Terrell, Sonoita Research Observatory,
Sonoita, AZ; R. Stephens, Yucca Valley, CA; P. Pravec and P. Kusnirak,
Ondrejov Observatory; R. Durkee, Minneapolis, MN; and A. Galad, Modra
Observatory, report that photometric observations obtained during 2005
Dec. 4-2006 Jan. 11 reveal that minor planet (1717) has a lightcurve
consisting of two linearly additive components with periods 5.1484 and
18.236 hr (and amplitudes 0.08 and 0.13 mag), respectively.
Attenuations due to occultations/eclipses do not appear to be occurring
at the present geometry, but further monitoring through the end of the
current apparition and at future apparitions (to look for attenuations
at different geometries) are needed to confirm the inferred binary
nature and determine the relative sizes of the components.

(C) Copyright 2006 CBAT
2006 January 17 (CBET 369) Daniel W. E. Green [2006-01-17 17:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data of 2006-01-11.3 by Walt, John and Dirk from SRO joined in. They fit well with the two period model, see
http://www.asu.cas.cz/~ppravec/arlon_all.png
http://www.asu.cas.cz/~ppravec/arlon_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_shortpc.png
The estimated periods and amplitudes of the two rotational components are:
P1= 5.1484 +/- 0.0005 h
P2=18.236 +/- 0.01 h
Ampl1= 0.08 mag
Ampl2= 0.13 mag
As we have not caught mutual events, this one remains a probable binary, and Porb and Ds/Dp have not been directly constrained (though the latter is probably large, considering the lightcurve components' character). We are going to write a CBET announcement on it.

Considering possible follow-up observations, it would be useful to do them during 2006 Feb. 17 to March 5 as by that time the asteroid's geometry will be changed by a good amount and we should have a better chance to detect possible occuring mutual events. The previous Jan/Feb lunation is not likely to provide enough change of the geometry, so I suggest we plan follow up observations for the Feb/March lunation.

Cheers, Petr [2006-01-12 09:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006-01-10.4 by Walt, John and Dirk from SRO
2006-01-11.0 by Adrian from Modra
Both datasets fit well with the two-period model, see
http://www.asu.cas.cz/~ppravec/arlon_all.png
http://www.asu.cas.cz/~ppravec/arlon_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_shortpc.png
They have nailed down the solution more, the estimated periods are now:
P1= 5.1484 h (error <0.001 h)
P2=18.236 h (error ~0.01 h)
Ampl1= 0.08 mag
Ampl2= 0.13 mag
The comments that I wrote yesterday remain unchanged. Since Walt has announced that SRO is taking more data tonight, we will wait for them. I think that we will write a CBET announcement on the probable binary after them right away.

Cheers, Petr [2006-01-11 10:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· SRO starting 1717 tonight at about 5:00 UT or a little earlier.

-Walt [2006-01-11 02:42, Sonoita]

· Long session added tonight.

Adrian [2006-01-11 02:32, Modra] Message sent to BinAstPhotSurvey conference

· Data of 2006-01-10.3 by Russ Durkee from Shed of Science Observatory joined in. They have covered the missing long-period phases and nailed down the solution:
P1= 5.1488 +/- 0.0005 h
P2=18.247 +/- 0.005 h
Ampl1= 0.08 mag
Ampl2= 0.13 mag
See pictures:
http://www.asu.cas.cz/~ppravec/arlon_all.png
http://www.asu.cas.cz/~ppravec/arlon_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_shortpc.png

Adrian Galad plans to cover the long period phases 0.98-1.25 the second time tonight from Modra, if having good sky. It will be the last night for this one for this lunation. Unless his data shows something unexpected, we will prepare an announcement for CBET. Since the long period lightcurve component appears to be just a rotational lightcurve and we have not resolved mutual events, this one remains a probable binary. Not having seen mutual events, we have not directly constrained Porb and Ds/Dp, though the latter is probably large, considering the shape and amplitude of the components.

Cheers, Petr [2006-01-10 15:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data of 2006-01-09.0 by Peter K. from here joined in. They fit pretty well, the short period is nailed down entirely: 5.1489 h (formal error 0.0001 h), a monomodal solution is ruled out. The long period is unique as well: 18.251 h (formal error 0.001 h), but its interesting shape suggests that it may be indeed just a rotational lightcurve of the secondary, see following pictures:
http://www.asu.cas.cz/~ppravec/arlon_all.png
http://www.asu.cas.cz/~ppravec/arlon_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_shortpc.png
To reveal it with more certainty, we need to cover the missing phases of the long period: 0.04-0.19 in the above picture, or better 0.98-1.25 at least to get a needed minimal overlap with the other data. Empherides for the phases follow:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-10 3.62 0.980
2006- 1-10 21.87 0.980
2006- 1-11 16.12 0.980

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-10 8.56 0.250
2006- 1-11 2.81 0.250
2006- 1-11 21.06 0.250

So, it can be covered either tonight from America or on the next night from Europe.

Clear Skies, Petr [2006-01-09 15:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this target since 19 UT (Jan. 08) and expecting full-night run (till ~5:45 UT).

Peter [2006-01-08 21:12, Ondrejov]

· :-(( But ended soon due to sordid low clouds on 22UT

Stefan/Jozef [2006-01-08 00:19, Modra] Message sent to BinAstPhotSurvey conference

· We started with it on Jan.07, 21:24UT for a looooooong run.
PS: Hello collaborating boys, in 2006 ! :-)

Stefan/Jozef [2006-01-07 21:48, Modra]

· Data of 2006-01-05.4 by Walt, John and Dirk from SRO joined in. They fit well and cover a part of the long-period component's minimum around phase 0.5, see following pictures:
http://www.asu.cas.cz/~ppravec/arlon_all.png
http://www.asu.cas.cz/~ppravec/arlon_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_shortpc.png
The long period is refined to 18.25 h (error <0.01 h), the short period is held at 5.149 h (error <0.001 h). The increasing amount of data begins to favor the bimodal shape with the period of 5.149 h rather than a monomodal solution with 2.574 h; the shape appears to be not quite symmetric, but more adta are needed to it down. Btw, if the primary's period is indeed 5.149 h, it would be the second longest (after 3982 Kastel) primary's period we have found so far in asynchronous binaries. It would suggest that the Arlon's primary has been slowed down more than others. If/when we derive Porb ---either confirming that it is equal to P2=18.25 h, or finding a different value after we resolve mutual events well--- and Ds/Dp, it will be very interesting to look at dynamical parameters of the system. An educated guess is that the secondary is relatively large that caused a higher rate of primary's slow down, but we shall see.

The most critical thing now is to cover the missing phases 0.81-1.03 (or better, 0.74-1.21; see the ephemerides below) twice. That should nail down the long-period component's shape, and we should be able to derive better whether the long-period component's minima are mutual events or if they are just a rotational lightcurve of the secondary. One more good coverage of the minimum around phase 0.50 would be useful as well (in very good conditions only), since the data show there characteristic "shoulders" typical for mutual events, so nailing down it with one more night would be useful as well. (The more data should also contribute to nailing down the short period at the currently preferred value of 5.149 h.)

Cheers, Petr [2006-01-07 11:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data of 2006-01-04.4 by John, Walt and Dirk from SRO joined in. They nailed down both periods: P1=5.149 h (assuming a bimodal lightcurve) and P2=18.24 h, and completed double coverage of given phases of the long period. They didn't resolve, however, whether there are present mutual events or not. To resolve it, a coverage of missing phases of the long period lightcurve is needed. See comments and ephemerides further below.

The current solution (with bimodal shape assumed for the short period component) see pictures:
http://www.asu.cas.cz/~ppravec/arlon_all.png
http://www.asu.cas.cz/~ppravec/arlon_longpc.png
http://www.asu.cas.cz/~ppravec/arlon_shortpc.png

The missing long-period phases (with a minimum) that need to be covered (twice) are 0.81-1.03 in the above picture. Nevertheless, in order to link them unambiguously with the other data, some overlap will be needed, so actually starting a run not later than at phase 0.74 or finish it not sooner than at phase 0.21 is needed; that way an overlap to a preceding or a following maximum, respectively, of the long period will be achieved. Ephemerides for the phases 0.74 and 0.21 follow:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1- 5 13.95 0.740
2006- 1- 6 8.19 0.740
2006- 1- 7 2.43 0.740
2006- 1- 7 20.67 0.740
2006- 1- 8 14.90 0.740
2006- 1- 9 9.14 0.740
2006- 1-10 3.38 0.740
2006- 1-10 21.61 0.740
2006- 1-11 15.85 0.740

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1- 5 22.53 0.210
2006- 1- 6 16.77 0.210
2006- 1- 7 11.01 0.210
2006- 1- 8 5.24 0.210
2006- 1- 8 23.48 0.210
2006- 1- 9 17.72 0.210
2006- 1-10 11.95 0.210
2006- 1-11 6.19 0.210
2006- 1-12 0.43 0.210

The other minimum of the long period around phase 0.50 in the above picture would be good to be covered once again as well, to nail down its shape, that should also contribute to resolving whether there is a mutual event there or not. An ephemeris for middle times of the minimum follows:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1- 6 3.91 0.505
2006- 1- 6 22.15 0.505
2006- 1- 7 16.39 0.505
2006- 1- 8 10.62 0.505
2006- 1- 9 4.86 0.505
2006- 1- 9 23.10 0.505
2006- 1-10 17.33 0.505
2006- 1-11 11.57 0.505

Cheers, Petr [2006-01-05 10:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· It is clearing here and we have started a run at 05:25 UT.

John G [2006-01-04 05:25, Sonoita]

· New data joined in:
2005-12-04.4 by Bob Stephens from GMARS
2006-01-02.4 by John, Walt and Dirk from SRO.
The short period is being improved to 5.149 h assuming a bimodal lightcurve; a period of 2.575 h with a monomodal lightcurve fits equally well. The long period is still fluctuating a bit, the best fit is for 18.24 h now, but more data are needed to nail it down. They should also resolve whether the long period lightcurve component shows mutual events, or if it is just a rotational lightcurve of the secondary; the current solution may be biased in that point, and more data are needed to resolve the critical thing.
The current solution (with the bimodal lightcurve for the short period component) see pictures:
http://www.asu.cas.cz/~ppravec/arlon_all.png
http://www.asu.cas.cz/~ppravec/arlon_shortpc.png
http://www.asu.cas.cz/~ppravec/arlon_longpc.png

Cheers, Petr [2006-01-03 10:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· We have started a run on this asteroid at 04:30 UT. Weather is marginal to get a full night's data.

John G [2006-01-03 06:42, Sonoita]

· Walt, John, Dirk,
Your first three nights 2005-12-29.4 to 31.3 suggest that it is a binary. A preliminary solution:
P1= 5.15 h
P2=18.46 h
See following pictures:
http://www.asu.cas.cz/~ppravec/arlon_all.png
http://www.asu.cas.cz/~ppravec/arlon_shortpc.png
http://www.asu.cas.cz/~ppravec/arlon_longpc.png
Well, the periods need to be nailed down with more data. It is also not clear yet whether the long period component is just a rotational lightcurve of the secondary, or if there are present also eclipses. So, more data!

Cheers, Petr [2006-01-02 11:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run from SRO at 05:36 UT. Currently partly cloudy but weather may hold through the night.

John G [2006-01-02 07:28, Sonoita]

· Second night's data shows three maxima again but do not look the same as last night and do not phase with last night. Amplitude up to 0.2 mags now. Have just started a third night.

-Walt [2005-12-31 03:39, Sonoita] Message sent to BinAstPhotSurvey conference

· We have started a run from SRO at 04:50 UT. Weather looks good for the rest of the night.

John G [2005-12-30 05:07, Sonoita]

· Last night's curve was a bit odd looking with three maxima and minima. Amplitude of 0.13 magnitudes. Clouds own the sky at the moment. We might get to run later. Otherwise this asteroid will still be missing two consecutive nights. Any help would be appreciated.

-Walt [2005-12-30 02:55, Sonoita] Message sent to BinAstPhotSurvey conference

· Working 1717 from SRO tonight. Should be able to get a second night tomorrow night to close it out.

-Walt [2005-12-29 01:54, Sonoita]

· Worked on 2005-12-04 at GMARS (Goat Mountain Astronomical Reasearch Station - G79). From about 5 hours of data, 1717 appears to have a fairly bimodal lightcurve with an amplitude of approximately 0.1 magnitudes. Will not be able to obtain more data for at least a week.

Bob Stephens [2005-12-05 00:21, Santana] Message sent to BinAstPhotSurvey conference

(4563) Kahnia (Finished) [Add new note]
· Julian Oey has done this new target from Leura on six nights: Unique period, no significant deviation,
http://www.asu.cas.cz/~asteroid/04563.png
Target done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-10-16 00:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 10/10 ad 10/11 , amplitude of 0.46m measured. [2014-10-12 00:49, Blue Mountains Obs] Message sent to observers

· observed on 10/05 and 10/07. Data indicate 12.5h period [2014-10-07 23:16, Blue Mountains Obs]

· Start new target from 11:31 UT expecting to finish about 19UT [2014-10-04 12:08, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(37274) 2000 XO42 (Finished) [Add new note]
· Another new target done by Don Pray: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/37274.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-10-07 13:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at 01:50 UT.
Don [2014-10-03 01:04, Sugarloaf]

· Starting this new target at 02:10 UT.
Don [2014-09-28 00:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

(98338) 2000 SB296 (Finished) [Add new note]
· Done by Joe Pollock with Prompt,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-10-06 13:45, Ondrejov]

· Run from last night shows a period of about 4.6 hours and an amplitude of 0.4 magnitudes. Joe [2014-09-21 20:14, Dark Sky & PROMPT] Message sent to observers

· Began this new target tonight at 0030 UT from Prompt Tololo. Joe [2014-09-21 00:41, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(1652) Herge (Finished) [Add new note]
· Slowish rotator, done sufficiently for the Survey by Joe Pollock. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-10-06 12:37, Ondrejov]

· Worked two nights. One Tololo and one Perth. Period looks to be ~16 hours with an amplitude of ~0.4. Joe [2014-09-18 23:09, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(3755) Lecointe (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain on 7 nights. Obtained a unique period, they are enough data for the slow-ish rotator:
http://www.asu.cas.cz/~asteroid/03755.png
Target done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Cheers, Petr [2014-10-06 11:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 01:15 UT.
Don [2014-10-03 01:09, Sugarloaf]

· Starting this one at 01:40 UT. Looks like a period near 28h.
Don [2014-09-28 00:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be starting this fairly slow rotator (~24 h) at 02:00.
Don [2014-09-24 01:16, Sugarloaf]

· Starting a run at 02:00. This is another slow rotator.
Don [2014-09-23 00:54, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Plan to start this new target at 02:15 UT.
Don [2014-09-20 00:20, Sugarloaf]

(38063) 1999 FH (Finished) [Add new note]
· Inconclusive result, likely a long(ish) period, but not at a conclusive level. Target closed. Petr [2014-10-03 12:30, Ondrejov]

· I'll be starting a run on this at 02:40 UT.
Don [2014-08-19 01:56, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be doing a run on this 02:45 UT to confirm that there isn't a long period drift.
Don [2014-08-15 01:43, Sugarloaf]

· We observed this one in 4 night from July 30 to Aug 3. But I see no trend in lcs. Very very flat.
Marek [2014-08-07 14:22, SkalnatePleso] [Remove]
Message sent to observers

· I plan to start a run on this at 03:15 UT.
Don [2014-08-07 02:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this new target at 03:30 UT.
Don [2014-08-05 01:48, Sugarloaf]

(39815) 1997 XU9 (Finished) - New Target [Add new note]
· Began this target from the current list at 0050 UT from Prompt Tololo. Hope to get 9 hours. Joe [2014-09-30 23:49, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(106206) 2000 UR29 (Finished) [Add new note]
· Don Pray has observed this new target from Sugarloaf Mountain on five nights, found it to be a low amplitude object. One of a few possible periods:
http://www.asu.cas.cz/~asteroid/106206.png
Though we cannot get a unique solution, there is no deviation suspect for binarity. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Don on the tough target.

Petr [2014-09-30 06:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this slow rotator at 00:20 UT.
Don [2014-09-28 00:39, Sugarloaf]

· Started this new target at 00:45 UT.
Don [2014-09-23 00:56, Sugarloaf] Message sent to BinAstPhotSurvey conference

(70411) 1999 SF3 (Finished) [Add new note]
· Another new target done by Don Pray from Sugarloaf Mountain: Unique period, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/70411.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Cheers, Petr [2014-09-29 12:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:00.
Don [2014-09-24 01:12, Sugarloaf]

· Started this new target at 00:40 UT.
Don [2014-09-23 00:59, Sugarloaf]

(7813) Anderserikson (Finished) - paired asteroid [Add new note]
· Closed for this apparition. Petr [2014-09-22 11:20, Ondrejov]

· I started a run on this at 00:10 UT.
Don [2014-09-20 00:19, Sugarloaf] Message sent to observers

· I started a run on this at 00:15 UT.
Don [2014-09-19 00:39, Sugarloaf]

· I started this at 00:20 UT.
Don [2014-09-18 00:21, Sugarloaf]

· Started a run at 01:10 UT...delayed due to clouds.
Don [2014-09-17 01:08, Sugarloaf] Message sent to observers

· Started a run on this at 00:30 UT.
Don [2014-09-15 03:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started on this at 00:40 UT.
Don [2014-09-05 02:35, Sugarloaf]

· I started this at 00:40 UT.
Don [2014-09-04 00:43, Sugarloaf]

· Started a run at 00:40 UT.
Don [2014-09-02 00:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This secondary of the pair 4905-7813 has been observed by Don Pray from Sugarloaf Mountain and by Peter Kusnirak from here. The data reveal a period of 13.28 h, but there are two or three short (0.4-0.8 h) attenuations in the Don's data for which Don sees no observational problem. It would be good to confirm the attenuations with observations from other stations, I encourage you here to help out.
http://www.asu.cas.cz/~asteroid/007813.png

Clear Skies, Petr [2014-09-01 06:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:50 UT.
Don [2014-08-30 01:58, Sugarloaf] Message sent to observers

· Started a run at 01:10 UT.
Don [2014-08-29 01:18, Sugarloaf]

· Observed from 19:30 UT to 0:50 UT. Peter [2014-08-28 03:09, Ondrejov]

· Started a run at 00:50 UT.
Don [2014-08-27 00:57, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 01:30 UT.
Don [2014-08-26 01:30, Sugarloaf]

· Started this at 01:10 UT.
Don [2014-08-20 01:52, Sugarloaf]

(2484) Parenago (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain: Unique solution, good coverage, no deviation (other than a change of the amplitude with phase angle),
http://www.asu.cas.cz/~asteroid/02484.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Don.

Cheers, Petr [2014-09-16 07:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 02:30 UT.
Don [2014-09-15 03:34, Sugarloaf]

· I'll be starting this one at 02:50 UT.
Don [2014-09-05 02:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this new target at 02:50 UT.
Don [2014-09-04 02:04, Sugarloaf]

(4909) Couteau (Finished) [Add new note]
· Joe Pollock has observed this new target with Prompt at Tololo and SSO: Unique period, good coverage, no substantial deviation,
http://www.asu.cas.cz/~asteroid/04909.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-09-10 06:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· First night of data show a period of slightly over 5 hours and an amplitude of 1 magnitude. No obvious deviations. Joe [2014-08-07 22:24, Dark Sky & PROMPT] Message sent to observers

· Began a run on this new object from the current target list at 1430 UT from Prompt Siding Spring. Got an 8 hour run from Tololo last night. Joe [2014-08-07 15:02, Dark Sky & PROMPT]

· Began a run on this new object from the current target list at 0230 UT from Prompt Tololo. Joe [2014-08-07 03:16, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(25355) 1999 NT (Finished) [Add new note]
· Don Pray has done this new target from Sugarloaf Mountain: Unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/25335.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice, quick and clean work Don.

Cheers, Petr [2014-09-08 10:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run at 01:50 UT.
Don [2014-09-05 02:37, Sugarloaf]

· Started this new target at 02:00 UT.
Don [2014-09-04 02:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

(20562) 1999 RV120 (Finished) - slow rotator [Add new note]
· Yet another slow rotator observed by Don from Sugarloaf Mountain. It's a unique period solution of 135 hours, but it is inconclusive re. possible tumbling; with allowed adjustments of the nightly magnitude scale zero points, the data can be fit to a one-period curve.
http://www.asu.cas.cz/~asteroid/20562.png

Good work, Don.

Cheers, Petr [2014-09-03 14:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start a run on this at 03:45 UT.
Don [2014-08-19 01:54, Sugarloaf]

· I plan to start a run on this at 03:50 UT.
Don [2014-08-15 01:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting a run on this secondary target at 04:30 UT.
Don [2014-08-05 01:53, Sugarloaf]

· Doing a second run on this tonight. It looks like another slow rotator.
Don [2014-08-01 03:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this new target at 04:45 UT.
Don [2014-07-31 03:09, Sugarloaf]

(33046) 1997 UF2 (Finished) - binary suspect [Add new note]
· This target remains a binary suspect, but a confirmation has to wait for a future apparition.
http://www.asu.cas.cz/~asteroid/33046_p1.png
Added to
http://www.asu.cas.cz/~ppravec/newres.htm

Good effort, Don, Joe, Peter and Kamil on the tough target.

Petr [2014-09-03 06:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 00:45 UT.
Don [2014-09-02 00:46, Sugarloaf] Message sent to observers

· Started a run at 00:00 UT.
Don [2014-08-30 01:57, Sugarloaf]

· I started a run at 01:15 UT.
Don [2014-08-29 01:20, Sugarloaf]

· Started a run at 00:50 UT. Should go for 5 hours.
Don [2014-08-27 00:56, Sugarloaf] Message sent to observers

· Started this at 01:20 UT.
Don [2014-08-26 01:20, Sugarloaf]

· Observed this one 19:15-00:00 UT on Aug. 24th in variable conditions. Best wishes, Kamil [2014-08-25 01:15, Ondrejov] Message sent to observers

· Began a run from Prompt Tololo at 0030 UT. Hope to follow until about 0800 UT. Joe [2014-08-21 23:52, Dark Sky & PROMPT]

· Began a run from Prompt Tololo at 0015 UT. Hope to follow until about 0815 UT. Joe [2014-08-20 00:19, Dark Sky & PROMPT] Message sent to observers

· Observing from 20:10 UT under variable conditions. Peter [2014-08-19 21:30, Ondrejov]

· Don Pray has observed this new target from Sugarloaf Mountains. It is a short period of 2.64 h (U = 2+ or 3-) and there is an apparent attenuation before the end of his 4th night, see the x-ed points in following plot:
http://www.asu.cas.cz/~asteroid/33046_p1.png

Don is going to take more observations, but he needs a help from other stations.

Clear Skies, Petr [2014-08-19 06:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run on this interesting target at 01:50 UT.
Don [2014-08-19 01:43, Sugarloaf]

· I plan to start a run on this at 02:20 UT.
Don [2014-08-15 01:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting a run on this at 02:30 UT.
Don [2014-08-07 02:26, Sugarloaf]

· Starting a run on this at 03:00 UT.
Don [2014-08-05 01:50, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 03:30 UT.
Don [2014-08-01 03:45, Sugarloaf]

· I got nothing on this last night due to clouds, but will start it tonight at 03:15 UT.
Don [2014-07-31 03:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Will attempt a run tonight if the forecast clear sky ever appears.

Don [2014-07-30 04:15, Sugarloaf]

· Starting this at 03:45 as a new primary target.
Don [2014-07-25 01:41, Sugarloaf] Message sent to BinAstPhotSurvey conference

(16641) Esteban (Finished) - slow rotator [Add new note]
· Another slow rotator done by Don Pray from Sugarloaf Mountain.
http://www.asu.cas.cz/~asteroid/16641.png
Closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-08-27 07:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· This night observed from 21:00 UT. Gabo [2014-08-21 21:52, SkalnatePleso] [Remove]
Message sent to observers

· Observing this object from 21:50 UT. Gabo [2014-08-19 21:57, SkalnatePleso] [Remove]

· I started a run on this at 01:20 UT as a secondary to 33046.
Don [2014-08-19 01:42, Sugarloaf] Message sent to observers

· I started a run on this at 01:30 UT.
Don [2014-08-15 01:40, Sugarloaf]

· Started a run on this at 01:30 as a secondary target.
Don [2014-08-05 01:52, Sugarloaf] Message sent to observers

· Attempting a run on this very slow rotator tonight.
Don [2014-07-30 04:17, Sugarloaf]

· Starting this as a secondary target (along with another secondary, 1705), at 02:45.
Don [2014-07-25 01:38, Sugarloaf] Message sent to observers

· Observing from 20:45 UT. Peter, AGO Modra. [2014-07-24 21:41, Modra]

· Starting this at 03:00 UT.
Don [2014-07-22 02:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this new target at 03:00 UT. This and 6521 are the first targets observed with my new telescope. Hopefully, everything will run smoothly once I go to sleep. More data! [2014-07-21 03:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

(56436) 2000 GZ46 (Finished) [Add new note]
· Unsuccessfull observations. [2014-08-19 10:33, Ondrejov]

· Start observing this new target from 11:25UT [2014-07-26 14:02, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(6521) Pina (Finished) [Add new note]
· This new target was observed by Don Pray from Sugarloaf Mountain and by Jan Vrastil and Kamil Hornoch from here. Despite its low amplitude of only 0.05 mag, there is a clear signal with period of 2.91 h,
http://www.asu.cas.cz/~asteroid/06521.png
http://www.asu.cas.cz/~asteroid/06521_nsp.png
We consider it to be an U = 2+ result, maybe even tending to 3-, considering how well the lightcurve features repeat in the highest quality Ondrejov nights. Target done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-08-18 12:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· This target was observed by J. Vrastil for 3.5 hours last night (from here) and we have same plan for tonight.

Peter [2014-07-23 11:53, Ondrejov] Message sent to observers

· Starting this at 03:40 UT.
Don [2014-07-22 02:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this one at 03:40 UT.
Don [2014-07-21 03:14, Sugarloaf]

(1705) Tapio (Finished) - slow rotator [Add new note]
· Don Pray has worked this new target, revealed it to be a slow rotator.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Target closed.

Petr [2014-08-18 08:48, Ondrejov]

· Starting this one at 02:45.
Don [2014-07-25 01:36, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this one at 03:00 UT.
Don [2014-07-22 02:46, Sugarloaf]

· I started this slow rotator at 02:50 UT as a secondary target.
Don [2014-07-21 03:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I did a run on this last night and will do another tonight.

Don [2014-06-30 02:48, Sugarloaf]

· Planning to start a run at 04:30 UT.
Don [2014-06-28 01:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this at 04:40 UT.
Don [2014-06-23 00:58, Sugarloaf]

· I observed this one last night.
Don [2014-06-22 15:53, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this new target at 05:05 UT.
Don [2014-06-20 01:51, Sugarloaf]

(6095) 1991 UU (Finished) - slow rotator [Add new note]
· This new target was found to be a slow rotator. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2014-07-19 08:49, Ondrejov]

· Plan to observe this one tonight as complementary target to 3146. Best wishes, Kamil [2014-07-18 20:37, Ondrejov] Message sent to observers

· Observing as complementary target to 3146. Peter [2014-07-17 23:36, Ondrejov]

· Began observing from Tololo at 0300 UT under good conditions. Hope to get to 1030 UT. Perth observations ran from 1640 UT to 2058 UT. Joe [2014-06-23 04:17, Dark Sky & PROMPT] Message sent to observers

· New target from current target list. Began observing from Perth at 1640 UT under good conditions. Hope to get to 2200 UT. Joe [2014-06-22 19:06, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(6944) 1979 MR3 (Finished) - serious binary suspect - collaboration needed [Add new note]
· An inconclusive result: Appears to be binary, but a period of the three observed sparse attenuations not established, probably long. Thorough observations needed in a future apparition. Petr [2014-07-16 07:51, Ondrejov]

· Began run from Prompt Tololo at 2255 UT under good conditions. Hope to go to about 0700 UT. Joe [2014-06-29 22:56, Dark Sky & PROMPT] Message sent to observers

· Began run from Prompt Tololo at 2310 UT under good conditions. Hope to go to about 0700 UT and cover predicted event centered at 0416 UT. Joe [2014-06-28 01:23, Dark Sky & PROMPT]

· observed 06/26 from 10:44 to 15:36 UT. [2014-06-27 00:54, Blue Mountains Obs] Message sent to observers

· Last night's run stopped early by GRB. Started tonight at 2315 UT under good conditions. Joe [2014-06-26 23:43, Dark Sky & PROMPT]

· Joe Pollock's observations with PROMPT on 2014-06-25.1 have ruled out a value of ~21 h for the orbital period that was possible before. The best solution now is for P_orb = 62.3 h,
http://www.asu.cas.cz/~asteroid/06944_porb.png
http://www.asu.cas.cz/~asteroid/06944_p1.png

We need to nail down it with more observations of the events. An event ephemeris for this P_orb:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 6-26 21.45 0.252
2014- 6-29 11.75 0.252
2014- 7- 2 2.05 0.252
2014- 7- 4 16.35 0.252

Date/Time UTC (LTc.) Phase
--------------------------
2014- 6-28 4.27 0.747
2014- 6-30 18.57 0.747
2014- 7- 3 8.87 0.747
2014- 7- 5 23.17 0.747

However, there remains a possibility that it is an eccentric orbit with P_orb = 62.3/2 h. To eliminate it, we need to cover times +/-4 hours centered at following times:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 6-27 7.40 0.824
2014- 6-28 14.55 0.824
2014- 6-29 21.70 0.824
2014- 7- 1 4.85 0.824
2014- 7- 2 12.00 0.824
2014- 7- 3 19.15 0.824
2014- 7- 5 2.30 0.824
2014- 7- 6 9.45 0.824

Observations taken during these time intervals will cover missing orbital phases for the case of P_orb = 31.15 h; if they reveal events there, then it will be this shorter P_orb.

Clear Skies, Petr [2014-06-26 08:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Prompt Tololo at 2300 UT under good conditions. Hope to go to about 0715 UT. Joe [2014-06-25 23:02, Dark Sky & PROMPT] Message sent to observers

· Began another run from Prompt Tololo at 2310 UT under good conditions. Hope to go to about 0730 UT. Joe [2014-06-24 23:10, Dark Sky & PROMPT]

· Transparency went quickly. No useful results. Will try again tonight. Joe

----------------------------------------------------

Began a run from Prompt Tololo at 2310 UT under good conditions. Hope to go to about 0730 UT. Joe [2014-06-24 16:36, Dark Sky & PROMPT] Message sent to observers

· Began a run from Prompt Tololo at 2310 UT under good conditions. Hope to go to about 0730 UT. Joe [2014-06-23 23:44, Dark Sky & PROMPT]

· Julian Oey has found this new target to be likely a binary. One of a few possible solutions:
http://www.asu.cas.cz/~asteroid/06944_porb.png
http://www.asu.cas.cz/~asteroid/06944_p1.png

It needs to be nailed down with additional data (errors <= 0.03 mag). Observations from substantially different longitudes than Australia are needed to remove an ambiguity in the P_orb solution. We therefore ask others here to help out Julian with this one.

Clear Skies,

Petr [2014-06-23 11:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 06/16,06/17,06/18,06/20 with mainly good quality data for the first 4 nights but deteriorate in the last hour on the last session. Data sent in. [2014-06-21 06:46, Blue Mountains Obs] Message sent to observers

· observed from 10:11 to 16:55 UT 06/08. [2014-06-10 07:30, Blue Mountains Obs]

· Started a new observation from 09:36 UT to 16:57 UT 06/07. [2014-06-08 01:54, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

4029 Bridges (Finished) - return binary, 5th apparition [Add new note]
· Done for the 5th apparitions from PROMPT and Simeiz. Cheers, Petr [2014-07-09 12:17, Ondrejov]

· The object was odserved 02.06 (Pha0.750)and 03.06 (Pha 0.249). Nelya. [2014-06-04 18:48, Simeiz] Message sent to observers

· More data (errors not greater than 0.02 mag) for both events would be useful; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 5-18 13.21 0.249
2014- 5-19 5.52 0.249
2014- 5-19 21.83 0.249
2014- 5-20 14.14 0.249
2014- 5-21 6.45 0.249
2014- 5-21 22.77 0.249
2014- 5-22 15.08 0.249
2014- 5-23 7.39 0.249
2014- 5-23 23.70 0.249
2014- 5-24 16.01 0.249
2014- 5-25 8.33 0.249
2014- 5-26 0.64 0.249
2014- 5-26 16.95 0.249
2014- 5-27 9.26 0.249
2014- 5-28 1.57 0.249
2014- 5-28 17.89 0.249
2014- 5-29 10.20 0.249
2014- 5-30 2.51 0.249
2014- 5-30 18.82 0.249
2014- 5-31 11.13 0.249
2014- 6- 1 3.45 0.249
2014- 6- 1 19.76 0.249
2014- 6- 2 12.07 0.249
2014- 6- 3 4.38 0.249
2014- 6- 3 20.69 0.249
2014- 6- 4 13.01 0.249
2014- 6- 5 5.32 0.249
2014- 6- 5 21.63 0.249
2014- 6- 6 13.94 0.249

Date/Time UTC (LTc.) Phase
--------------------------
2014- 5-18 5.06 0.750
2014- 5-18 21.37 0.750
2014- 5-19 13.68 0.750
2014- 5-20 5.99 0.750
2014- 5-20 22.31 0.750
2014- 5-21 14.62 0.750
2014- 5-22 6.93 0.750
2014- 5-22 23.24 0.750
2014- 5-23 15.55 0.750
2014- 5-24 7.87 0.750
2014- 5-25 0.18 0.750
2014- 5-25 16.49 0.750
2014- 5-26 8.80 0.750
2014- 5-27 1.11 0.750
2014- 5-27 17.43 0.750
2014- 5-28 9.74 0.750
2014- 5-29 2.05 0.750
2014- 5-29 18.36 0.750
2014- 5-30 10.67 0.750
2014- 5-31 2.99 0.750
2014- 5-31 19.30 0.750
2014- 6- 1 11.61 0.750
2014- 6- 2 3.92 0.750
2014- 6- 2 20.23 0.750
2014- 6- 3 12.55 0.750
2014- 6- 4 4.86 0.750
2014- 6- 4 21.17 0.750
2014- 6- 5 13.48 0.750
2014- 6- 6 5.79 0.750
2014- 6- 6 22.11 0.750

Clear Skies, Petr [2014-05-12 12:17, Ondrejov]

· Got run from Prompt Tololo 2310-0810 UT last night. Joe [2014-05-07 14:18, Dark Sky & PROMPT] Message sent to observers

· Began observations at 0100 UT from Prompt Tololo. Should get about 9 hours. Joe [2014-04-06 01:32, Dark Sky & PROMPT]

· Did run from Perth from 1510-2130 UT under good conditions. Joe [2014-04-02 00:12, Dark Sky & PROMPT] Message sent to observers

· Began observations at 0400 UT from Prompt Tololo. Should get about 6 hours. Joe [2014-03-30 04:18, Dark Sky & PROMPT]

· Conditions for this binary have already worsened to a point that follow up observations of a good quality and quantity are unlikely to be obtained in the next lunation, so I am closing this one here now.

Cheers, Petr [2006-06-07 13:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· CBET 507 with our announcement on the binarity of this one has appeared on May 8. I'm enclosing it below for your convenience, and I will add a link to it on our web pages as well.

Cheers, Petr

PS: I've attended a seminar in Modra, Slovakia in this week, and I'll travel out to MACE in Vienna tomorrow morning. I'll be back in Ondrejov on Monday, so I'll look over all new data (both those analyzed by Peter K. until May 8, as well as possible new ones) then.

(4029) BRIDGES
D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak, Ondrejov
Observatory; W. Cooney, J. Gross, and D. Terrell, Sonoita Research
Observatory, Sonoita, AZ; and R. Stephens, Yucca Valley, CA, report that
photometric observations obtained during Apr. 11-May 4 reveal that minor
planet (4029) is a binary system with an orbital period of 16.31 ± 0.01
hours. The primary rotates with a period of 3.5746 ± 0.0001 hours,
and it has a lightcurve amplitude of 0.20 mag. Mutual eclipse/occultation
events that are 0.06-0.12 mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.24 ± 0.02.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 May 8 (CBET 507) Daniel W. E. Green [2006-05-12 13:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yes, the last session by David has completed the discovery phase for this one. The solution:
Pprim= 3.5746 +/-0.0001 h
Porb= 16.31 (error <0.01 h)
Ds/Dp= 0.24 +/-0.02
Depths of mutual events: 0.06-0.12 mag
http://www.asu.cas.cz/~asteroid/4029_all.png
http://www.asu.cas.cz/~asteroid/4029_longpc.png
http://www.asu.cas.cz/~asteroid/4029_longpc_contacts.png
http://www.asu.cas.cz/~asteroid/4029_shortpc.png

So, we are going to write a discovery announcement on this one for CBET.

Cheers, Petr [2006-05-05 09:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed an 8 1/2hr run on this target (10:00 UT to 18:30UT) at Bin 2 due to the wind. A couple of bright stars in the field indicated just how windy it got throwing a spirograph pattern over the entire frame of soem images (and thats only 10kph!)

Anyway I caught the event at phase 0.76 and I believe I got most if not all of it at +/- 0.01

Data has been sent to Petr and Peter.

Cheers, David [2006-05-05 01:25, HuntersHill] Message sent to BinAstPhotSurvey conference

· Completed an 8 1/2hr run on this target (10:00 UT to 18:30UT) at Bin 2 due to the wind. A couple of bright stars in the field indicated just how windy it got throwing a spirograph pattern over the entire frame of soem images (and thats only 10kph!)

Anyway I caught the event at phase 0.76 and I believe I got most if not all of it at +/- 0.01

Data has been sent to Petr and Peter.

Cheers, David [2006-05-04 22:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· Below is an ephemeris for the secondary event for May 4-9 UT. The asteroid will be close to the Moon since May 10 so taking data of a good quality would be difficult after that.

Date/Time UTC (LTc.) Phase
--------------------------
2006- 5- 4 12.30 0.760
2006- 5- 5 4.61 0.760
2006- 5- 5 20.93 0.760
2006- 5- 6 13.24 0.760
2006- 5- 7 5.56 0.760
2006- 5- 7 21.87 0.760
2006- 5- 8 14.19 0.760
2006- 5- 9 6.50 0.760

Cheers, Petr [2006-05-03 07:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· We got about 4 hours worth from SRO last night (5/2/06 UT). Have not had the time to reduce the data yet. We plan to work it again tonight although we are having some equipment problems.

-Walt [2006-05-03 03:05, Sonoita] Message sent to BinAstPhotSurvey conference

· Yes, you covered the 0.25-phase event, Bob. The data are useful; they have refined the Porb estimate and nailed down the primary event. Current solution:
Pprim= 3.5745 +/-0.0001 h
Porb= 16.315 h (error <0.01 h)
Ds/Dp= 0.24 +/-0.02 (to be refined after completing coverage of the secondary event)
http://www.asu.cas.cz/~asteroid/4029_all.png
http://www.asu.cas.cz/~asteroid/4029_longpc.png
http://www.asu.cas.cz/~asteroid/4029_shortpc.png

One more good coverage of the secondary event (see the ephemeris I provided a few days ago) is needed to complete the discovery phase for this one.

Cheers, Petr [2006-05-01 15:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Although very low in the sky, I got a session from GMARS on Friday night and appear to have caught an event. Data sent to Petr and Peter. [2006-04-30 19:17, Santana]

· Yes, you caught an event, David. The current solution:
Pprim= 3.5745 +/-0.0001 h
Porb= 16.31 h (error <0.01 h)
Ds/Dp ~0.24
http://www.asu.cas.cz/~asteroid/4029_all.png
http://www.asu.cas.cz/~asteroid/4029_longpc.png
http://www.asu.cas.cz/~asteroid/4029_shortpc.png

One more good coverage of the event (see the ephemeris I provided yesterday) is needed to complete the discovery phase for this one.

Cheers, Petr [2006-04-28 09:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got full uninterupted coverage of 4029 from 13:00UT to 19:00UT and I beleive I caught an event. [2006-04-27 22:06, HuntersHill]

· New data by David from Hunters Hill of 04-26.6 and by Walt, John and Dirk from SRO of 04-26.3 are stabilizing the solution:
Pprim= 3.5744 +/-0.0001 h
Porb= 16.31 h (error <0.01 h)
http://www.asu.cas.cz/~asteroid/4029_all.png
http://www.asu.cas.cz/~asteroid/4029_longpc.png
http://www.asu.cas.cz/~asteroid/4029_shortpc.png
The event around phase 0.25 (note the changed zero time point for the plot in the above pictures) has been well covered on 04-24.5 and 04-26.6 (both nights by David). Its apparently somewhat greater depth on 04-11.6 at higher solar phase suggests that it might be a primary event. The other event around phase 0.75 in the above pictures has not been covered well, two good sessions covering it (plus some phases prior/after it) are needed to nail down the solution and to derive Ds/Dp. An ephemeris for midtime events:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 4-27 17.09 0.760
2006- 4-28 9.40 0.760
2006- 4-29 1.71 0.760
2006- 4-29 18.02 0.760
2006- 4-30 10.33 0.760
2006- 5- 1 2.64 0.760
2006- 5- 1 18.95 0.760
2006- 5- 2 11.26 0.760
2006- 5- 3 3.57 0.760
2006- 5- 3 19.88 0.760

Cheers, Petr [2006-04-27 11:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· 12th consecutive night and a full session (11 hours) with nearly 9.5 hours allocated to 4029. Looks like good data and a deviation in the curve indicates I may have caught an event.

Data sent to Petr and Peter. [2006-04-26 23:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Analysis of the current dataset by David suggests a period of the events of 16.31 h. We will see how it holds with more data. (The short period of 3.574 h is unique assuming a bimodal lightcurve.)
http://www.asu.cas.cz/~asteroid/4029_all.png
http://www.asu.cas.cz/~asteroid/4029_longpc.png
http://www.asu.cas.cz/~asteroid/4029_shortpc.png

Cheers, Petr [2006-04-26 07:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working from SRO. Should start imaging around 05:00 UT and go to about 10:00 UT.

-Walt [2006-04-26 01:48, Sonoita]

· Yet anotehr truncated session - but at least I am able to get some data. Each night seems to plot differently to the previous night. Data sent to Peter and Petr. [2006-04-25 04:09, HuntersHill] Message sent to BinAstPhotSurvey conference

· Another short session. Still can't make the data fit a nice curve so have sent it off to Petr and Peter for analysis. [2006-04-23 22:53, HuntersHill]

· Short session on this target before my automation software let me down. Best period I can derive is 3.59hrs and this one may be interesting - I just need more data.....

http://www.david-higgins.com/Astronomy/asteroid/images/4029LC.gif

For those interested I also included a run on 105 Artemis for Ellen Howell as it was passing spiral galaxy M61 (pretty pictures aren't my thing)
http://www.david-higgins.com/Astronomy/asteroid/images/105Artemis_M61-.jpg [2006-04-23 04:49, HuntersHill] Message sent to BinAstPhotSurvey conference

· The moon prevented me from covering 9992 so I did 4029 instead. Reasonable data in poor conditions. Various periods ranging from 3.6 to 7.3 hours fit. [2006-04-11 22:13, HuntersHill]

(2002) Euler (Finished) [Add new note]
· A good, fast work on this "prime suspect" by Julian Oey from Leura and by Jan Vrastil and Kamil Hornoch from here:
http://www.asu.cas.cz/~asteroid/02002_b4.png
No more data needed during this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-07-08 08:52, Ondrejov] Message sent to observers

· observed on 07/07 from 12:23 to 19:49UT. [2014-07-08 02:36, Blue Mountains Obs]

· Target was also observed by J. Vrastil (from here) last night. Peter K. [2014-07-07 13:53, Ondrejov] Message sent to observers

· Starting observation tonight about 12UT 0706 [2014-07-06 11:25, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This "prime suspect" was done well by Peter K. from here and by Jozef and Stefan from Modra on four half nights in its current 4th apparition: Unique solution and coverage, no deviation:
http://www.asu.cas.cz/~asteroid/02002_b1.png
Finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done.

Cheers, Petr [2011-10-24 10:12, Ondrejov] Message sent to observers

· Observing it from 20:08 UT. Jozef/Stefan [2011-10-22 20:36, Modra]

· Planning to observe from midnight to 3:40 UT. Peter K. [2011-10-17 18:58, Ondrejov]

· Observed this "prime suspect" for almost 4 hours last night. Peter K. [2011-10-17 09:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· The "prime suspect" has been done from Ondrejov and Carbuncle Hill in its 3rd apparition. No events observed in any of the three app's, a remaining probability that it is a binary where we just haven't captured events is low (I have to estimate it formally later on). The data from the three apparitions will be also useful for future shape modeling. Anyway, for the BinAstPhotSurvey, it has been done sufficiently.
http://www.asu.cas.cz/~asteroid/02002_a8.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-01-06 10:18, Ondrejov] Message sent to observers

· I started a run on this at 03:35 UT.
Don [2009-01-04 04:51, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I will start this one from ~00:00 UT as the second target for tonight. Conditions should be OK. Best wishes, Kamil [2008-12-29 21:53, Ondrejov] Message sent to observers

· I plan to start this at 03:15 UT, if the wind allows it.
Don [2008-12-29 02:37, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I will try this new target from 00:30 UT for ~4 hours. Best wishes, Kamil [2008-12-29 00:16, Ondrejov]

· This "prime suspect" (i.e., an asteroid with P and A in a range where binaries are frequent) has been done by David from Hunters Hill in its second apparition. Unique solution, good coverage, no deviation. It is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, David.

Cheers, Petr [2007-10-04 12:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-03 from 09:51UT to 17:38UT in poor conditions. Data refines the period to 5.991 +/- 0.008hrs with an amplitude of 0.14 +/- 0.02mag [2007-10-03 23:16, HuntersHill] Message sent to observers

· Observed 2007-10-02 from 09:57UT to 17:56UT in poor conditions. Data reveals a period of 5.98 +/- 0.05hrs with an amplitude of 0.17 +/- 0.02mag [2007-10-02 22:55, HuntersHill] Message sent to BinAstPhotSurvey conference

· The summary web site has been updated with this one. For interested people here, the composite lightcurve of 2002 is on following URL:
http://www.asu.cas.cz/~asteroid/2002.png

Cheers, Petr [2006-05-19 08:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Analysis of the complete dataset (SRO, Antelope Hills, Modra, and Hunters Hill) by Peter K. and me has shown that it is finished. Unique period of 5.9929 +/-0.0002 h, multiple coverage, no significant deviation seen. Nice work, guys.

I will update our web pages with summary data on it later on. (I am at the IMCCE in Paris now, all things but ftp to our web server work well, I've already asked our server manager to permit ftp to the server from here, so it should be done not too late.)

Cheers, Petr [2006-05-18 14:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· There were changing conditions tonight, but the lightcurve of 9423 seems to be useful according to my first view at data. I can join data with those by Bob after processing.
Adrian [2006-05-18 01:48, Modra] Message sent to BinAstPhotSurvey conference

· Got some noisey data (mostly good enough precision) but gaps due to the conditions. Data sent on to Petr and Peter. Canopus' first instinct was 5.9 hrs [2006-05-17 21:46, HuntersHill]

· Perhaps I could do this tonight - maybe with (9423) in the same field of view. (617) should wait :-(
Adrian [2006-05-17 20:06, Modra] Message sent to BinAstPhotSurvey conference

· Bob's latest date agree with a 6-hours solution but are still not ruling out a 8-hours possibility. We need more data, mainly from different longitudes, to resolve that ambiguity.

Peter K. [2006-05-16 16:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm planning to observe (2002) from about 03:30 UT to 09:30 UT tonight, May 17. Perhaps someone can extend my run.

Bob Koff [2006-05-16 15:19, AntelopeHills]

· Got in a short run on (2002) last night, indicating 3% photometry possible in the moonlight. Will work it again tonight, FWIW. Perhaps someone can extend my observations. Also observing another asteroid in the same field, (9423) Abt. Last night's observations indicated a short period, so I'll try to work it while it's still in the field with (2002). Two for the price of one :-)

Bob Koff [2006-05-16 02:35, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Got in a short run on (2002) last night (May 7). Will try for a longer run tonight, weather permitting.

Bob Koff [2006-05-08 01:55, AntelopeHills]

· Starting this new target tonight from SRO.

-Walt [2006-05-04 02:48, Sonoita] Message sent to BinAstPhotSurvey conference

(62212) 2000 SA62 (Finished) [Add new note]
· This new target has been done by Don Pray from Sugarloaf Mountain, by Peter Kusnirak and Kamil Hornoch from here, by Walt Cooney from SRO, and by Vasilij Chiorny from Kharkiv: Good solution, multiple coverage, only minor deviations seen, considered insignificant.
http://www.asu.cas.cz/~asteroid/62212.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Cheers, Petr [2014-06-25 10:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will start on this one at about 4:00 UT from SRO. Should be able to go to about 8:00 UT. -Walt [2014-06-23 01:48, Sonoita] Message sent to observers

· I'll be starting a run on this at 01:45 UT.
Don [2014-06-23 00:57, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing from 21 UT tonight. Peter K. [2014-06-22 22:23, Ondrejov] Message sent to observers

· I observed this one for a few hours on June 22 UT before SRO started.
Don [2014-06-22 15:55, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Will work from SRO tonight. -Walt [2014-06-21 19:40, Sonoita] Message sent to observers

· I started a run on this at 01:40 UT. Last night's run appears to show an attenuation.

Don [2014-06-21 01:51, Sugarloaf]

· I started a run on this at 01:40 UT, and should end at 05:40.
Don [2014-06-20 01:49, Sugarloaf] Message sent to observers

· Observed for 3 hours last night, but no attenuation detected. Peter K. [2014-06-18 14:27, Ondrejov]

· Observed for 4 hours last night. Peter K. [2014-06-09 01:51, Ondrejov] Message sent to observers

· I started a run on this at 01:40 UT. Also did a run on it last night as well. [2014-06-08 02:18, Sugarloaf]

· I will start this one at 20:45 UT. Best wishes, Kamil [2014-06-06 20:14, Ondrejov] Message sent to observers

· Observed in this night from 20:00 UT. Gabo [2014-06-04 18:47, SkalnatePleso] [Remove]

· Started a run on this at 01:35 UT.
Don [2014-06-03 01:42, Sugarloaf] Message sent to observers

· Observed this one in night 21/22 May from 19.6 to 24 UT.
It seems that the period of about 8 hours.
Vasilij Ch. [2014-05-23 10:39, Kharkiv]

· Starting this new target at 03:00 UT.
Don [2014-05-19 02:04, Sugarloaf] Message sent to BinAstPhotSurvey conference

(18787) Kathermann (Finished) [Add new note]
· Another new target revealed as slow rotator, this one by Julian Oey from Leura:
http://www.asu.cas.cz/~asteroid/18787.png
Target done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian.

Petr [2014-06-11 07:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· For this new target, Julian Oey took 7 nights of mixed quality; one of a few possible periods:
http://www.asu.cas.cz/~asteroid/18787.png

More linked data (errors not greater than 0.03 mag) are needed to establish it well. I encourage others to help out.

Clear Skies, Petr [2014-05-12 13:28, Ondrejov]

· Additional data was taken on 04/23, 04/24, 04/25, 05/01, 05/04, 05/05. Data sent in. [2014-05-10 09:56, Blue Mountains Obs] Message sent to observers

· Start a new target from 11:35 to 15.05 UT 04/20. A gentle slope downward in 3.5h indicating long period. [2014-04-21 08:56, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5551) Glikson (Finished) - slow rotator [Add new note]
· This new target was revealed to be a slow rotator by Don Pray from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/05551.png
Target closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort Don.

Petr [2014-06-11 07:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this night from 21 UT to 01 UT. Vasilij Ch. [2014-04-25 01:58, Kharkiv] Message sent to observers

· Doing a second night on this.
Don [2014-04-18 01:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

(7019) Tagayuichan (Finished) [Add new note]
· Closed, see
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2014-06-09 11:21, Ondrejov]

· Started a run at 01:40 UT.
Don [2014-06-08 02:19, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started at 01:40 UT.
Don [2014-06-03 01:44, Sugarloaf]

(27300) 2000 AA168 (Finished) [Add new note]
· This new target was done by Julian Oey from Leura and by Don Pray from Sugarloaf Mountain: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/27300.png
Target done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys.

Cheers, Petr [2014-06-09 07:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 05/28,06/02 and 06/03. data sent in [2014-06-05 12:55, Blue Mountains Obs] Message sent to observers

· This target was observed by Julian Oey (Leura) and Don Pray (Sugarloaf obs.) and is done for our Survey (unique period, double coverage). Here is the final composite light-curve:

http://www.asu.cas.cz/~asteroid/27300.png

Peter K. [2014-06-05 12:30, Ondrejov] Message sent to observers

· observed on 05/28,06/02 and 06/03. data sent in [2014-06-05 11:46, Blue Mountains Obs]

· I did a run on this in less than ideal conditions last night. Object has a high amplitude.
Don [2014-05-29 14:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

(8091) 1992 BG (Finished) [Add new note]
· This new target was done by Julian Oey from Leura and by us from Sierra Nevada Observatory and Ondrejov: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/08091.png
Target closed
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-05-30 12:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one tonight, Kamil [2014-05-22 22:22, Ondrejov] Message sent to observers

· This new target was observed from the OSN, supported by Julian Oey from Leura:
http://www.asu.cas.cz/~asteroid/08091.png
The period ius unique, but we need to obtain a double coverage (errors <= 0.03 mag).

Clear Skies, Petr [2014-05-12 12:51, Ondrejov]

· Observed on 04/23,05/04 and 05/09. Light curve show a period of 7.47h with amplitude of 1.1m. Early days still so will get more data to improve. [2014-05-10 10:39, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(10597) 1996 TR10 (Finished) [Add new note]
· This new target was done by Julian Oey from Leura, by Peter Kusnirak and Kamil Hornoch from here, and by Marek Husarik from Skalnate Pleso: Unique period, multiple coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/10597.png
Target done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done guys.

Cheers, Petr [2014-05-27 11:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 4.5 hours last night. Peter K. [2014-05-25 08:57, Ondrejov] Message sent to observers

· Clear skies, but strong wind today. From 21:00 UT. Gabo [2014-05-22 20:34, SkalnatePleso] [Remove]

· observed on 05/06, 05/08 and 05/09. data sent in. [2014-05-20 10:41, Blue Mountains Obs] Message sent to observers

· For this new target, Julian Oey took four good, but relatively short nights:
http://www.asu.cas.cz/~asteroid/10597.png
The period solution is not unique, needs to be nailed down. We also need to obtain double coverage.

Clear Skies, Petr [2014-05-12 12:58, Ondrejov]

· observed on 04/28 and 05/04. [2014-05-05 07:19, Blue Mountains Obs] Message sent to observers

· Observed on 04/22 and 04/23 [2014-04-27 09:03, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(388468) 2007 DB83 (Finished) [Add new note]
· This new target (Amor) has been done well by Julian Oey from Leura: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/388468.png
Target done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work Julian.

Cheers, Petr [2014-05-23 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations were done on 05/18 and 15/19. data sent in. [2014-05-20 10:50, Blue Mountains Obs] Message sent to observers

· Observed on 04/28 and 05/04 for 2 and 3.5 hours respectively. period of 5.52h with 1m amplitude found. no deviations noted. [2014-05-05 07:25, Blue Mountains Obs]

· observed on both 04/22 and 04/23. [2014-04-27 09:00, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(14196) 1998 XH59 (Finished) - Returning prime suspect [Add new note]
· This return "prime suspect" has been worked sufficiently by Don Pray from Sugarloaf Mountain and by Peter Kusnirak from here in its current 2nd apparition: Unique period, double coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/14196_b4.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-05-21 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:40 UT tonight. Peter K. [2014-05-19 21:01, Ondrejov] Message sent to observers

· I plan to start this at 03:00 UT.
Don [2014-05-19 02:06, Sugarloaf]

· I started this one around 03:30 UT.
Don [2014-05-12 18:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don has done this one well on four nights: Unique period, very good coverage, no deviation seen,
http://www.asu.cas.cz/~asteroid/14196.png
It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2007-04-13 07:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run at 03:35 UT.
Don [2007-04-11 03:39, CarbuncleHill]

· Started around 02:45 UT.
Don [2007-04-10 02:57, CarbuncleHill]

· Continueing with this tonight.
Don [2007-04-09 02:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting this tonight. Sky cleared unexpectedly, but may not last.
Don [2007-04-08 04:21, CarbuncleHill]

(25327) 1999 JB63 (Finished) [Add new note]
· Julian Oey took six nights from Leura. The data are too noisy for the BinAstPhotSurvey, but at least the period is well established:
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2014-05-12 13:35, Ondrejov]

· Observed on 04/23, 05/01, 05/04, 05/05, 05/08. Period is 6.72h with 0.63 m amplitude. Data sent in. [2014-05-10 10:10, Blue Mountains Obs] Message sent to observers

· Start a new target from 13.5 to 18.5 UT 04/22. Obtained an amplitude of 0.7m and a 6h period. [2014-04-23 05:25, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(18392) 1992 PT4 (Finished) [Add new note]
· This one (of the several new targets we started in the past lunation) has been done reasonably for the BinAstPhotSurvey from the OSN, by Don Pray from Sugarloaf Mountain, and by Peter Kusnirak from here:
http://www.asu.cas.cz/~asteroid/18392.png
It is a U = 2+ or 3- solution. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-05-12 13:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 6 hours last night (under variable conditions). Peter K. [2014-05-06 04:55, Ondrejov] Message sent to observers

· Plan to start this new target at 04:50 UT.
Don [2014-04-25 01:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

(4951) Iwamoto (Finished) - return binary, 3rd apparition [Add new note]
· Done for the 3rd apparition. Petr [2014-05-12 12:32, Ondrejov]

· observed from 09:15 to 14:14h UT 04/20. No event detected and try again tonight to get around the minima of phase 0.768. [2014-04-21 09:41, Blue Mountains Obs] Message sent to observers

· Unlike in the first two apparitions, we haven't detected events in this return long-period synchronous binary in its current 3rd apparition yet,
http://www.asu.cas.cz/~asteroid/04951_b4.png

Last attempts on covering the mising phases (also, events may develop with changing geometry) would be useful; an ephemeris for the centers of uncovered phases around the lightcurve minima:

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-19 0.3 0.227
2014- 4-23 22.0 0.227
2014- 4-28 19.7 0.227
2014- 5- 3 17.4 0.227

Date/Time UTC (LTc.) Phase
--------------------------
2014- 4-21 16.0 0.768
2014- 4-26 13.7 0.768
2014- 5- 1 11.4 0.768
2014- 5- 6 9.1 0.768

Clear Skies, Petr [2014-04-11 07:34, Ondrejov]

· Started a run at 03:00 and should be able to observe until 07:00 UT.
Don [2014-04-09 03:01, Sugarloaf] Message sent to observers

· Started a run at 00:40 UT in very good conditions.
Don [2014-04-07 00:58, Sugarloaf]

· Ran from SRO on 04-01 from 02:50 to 09:50 UT. Planning to run again tonight over about the same time period so we should be able to dovetail with the Prompt data. Should also be able to link with last night's SRO run.
-Walt [2014-04-02 00:54, Sonoita] Message sent to observers

· Began run from Prompt Tololo at 0005 UT under good conditions. Hope to be able to run until about 0630 UT. Joe [2014-04-02 00:10, Dark Sky & PROMPT]

· I started a run on this at 00:40 UT.
Don [2014-03-24 01:02, Sugarloaf] Message sent to observers

· Started a run at 00:20 UT.
Don [2014-03-22 00:51, Sugarloaf]

· Started this unusual binary last night (Mar 7), and am observing it again tonight, Mar 8.
Don [2014-03-08 02:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Second apparition closed. Petr [2012-10-29 10:17, Ondrejov]

· Follow up observation of return binary. Event detected 0.6m attenuation at 10.5h 08/26. [2012-08-27 02:04, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(1862) Apollo (Finished) [Add new note]
· Done. [2014-04-11 06:51, Ondrejov]

· Started this last night, but got only a short session due to clouds. Started a run tonight at 00:30 UT. [2014-04-03 00:39, Sugarloaf] Message sent to BinAstPhotSurvey conference

2008 FU6 - NEA binary - to be closed after finishing reduction of PROMPT observations [Add new note]
[Send data to: ppravec@astro.cz ]
· Began run at 0040 UT from Prompt Tololo. Errors about 0.03 with 240s exposure. Joe [2014-03-23 01:53, Dark Sky & PROMPT] Message sent to observers

· 2008 FU6 is currently relatively bright. It is at 18.0 tonight and will reach 17.9 on 3/27. This is the brightest it will be until about 2026. It is well placed in the sky being above 2 air masses for 8 hours from Chile and is in an uncrowded area as well. At Dec -7 it is available from both hemispheres. Also, the moon is rapidly diminishing. I plan to make extensive observations of it with Prompt and Petr has indicated that they will try to get some data with the DK154. Joe [2014-03-22 18:49, Dark Sky & PROMPT] Message sent to observers

· Hello all. There are some news about?
Stefan [2014-03-21 10:14, Modra]

· Began observing with 32" at Dark Sky Obs. at 0117 UT under good conditions. Joe [2011-05-10 03:42, Dark Sky & PROMPT] Message sent to observers

· Began observing with 32" at Dark Sky Obs. at 0125 UT under good conditions. Joe [2011-05-09 02:41, Dark Sky & PROMPT]

· Began observing from Prompt at 2320 UT under good conditions. Joe [2011-04-27 23:23, Dark Sky & PROMPT] Message sent to observers

· Observing from 19:55UT. Jozef, Stefan. [2011-04-24 19:55, Modra]

· Began observing with 32" at Dark Sky Obs. at 0125 UT under good conditions. Joe [2011-04-24 03:33, Dark Sky & PROMPT] Message sent to observers

· Trying this one from 19:40UT. Jozef, Stefan [2011-04-23 19:46, Modra]

· Observing this one from 19:20 UT (expecting 6.7 hr long run). Best wishes, Kamil [2011-04-22 19:41, Ondrejov] Message sent to observers

· I will try this one from 22:40 UT. Best wishes, Kamil [2011-04-20 20:59, Ondrejov]

· Began observing using Dark Sky 32" at 0345 UT. Should get about 6 hours of outside event light curve. Joe [2011-04-14 04:48, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt at 0100 UT. Hope to get predicted event ~0437 UT as well as possibly some overlap with Kamil. Joe [2011-04-11 01:12, Dark Sky & PROMPT]

· We going to observe this one from 19:30 UT if weather permit. Best wishes, Kamil + student [2011-04-10 17:43, Ondrejov] Message sent to observers

· Began observing from Prompt at 0200 UT. Hope to get predicted event ~0740 UT. Joe [2011-04-09 03:07, Dark Sky & PROMPT]

· Began observing from Prompt at 0030 UT under good conditions. Will try to get predicted event at 0916 UT. Joe [2011-04-08 00:44, Dark Sky & PROMPT] Message sent to observers

· Joe Polock has found this Apollo asteroid to be a serious binary suspect. His two nights 2011-04-04 and 05 with Prompt showed what appears to be a mutual event. The primary's rotation component has not been well revealed with its data, which hampers interpretation, but two values for the orbit period are possible: 22.5 h and 44-45 hours. Below I give an events ephemeris for the shorter period. More observations from stations spread in longitude and preferrably with a higher photometric accuracy are needed to establish the orbital as well as the primary lightcurve component.
http://www.asu.cas.cz/~asteroid/2008fu6_porb.png

Date/Time UTC (LTc.) Phase
--------------------------
2011- 4- 6 23.61 0.505
2011- 4- 7 22.06 0.505
2011- 4- 8 20.51 0.505
2011- 4- 9 18.96 0.505
2011- 4-10 17.41 0.505
2011- 4-11 15.86 0.505
2011- 4-12 14.31 0.505

Date/Time UTC (LTc.) Phase
--------------------------
2011- 4- 6 12.37 0.005
2011- 4- 7 10.82 0.005
2011- 4- 8 9.27 0.005
2011- 4- 9 7.72 0.005
2011- 4-10 6.17 0.005
2011- 4-11 4.62 0.005
2011- 4-12 3.07 0.005

Clear Skies, Petr [2011-04-06 06:52, Ondrejov] Message sent to BinAstPhotSurvey conference

(2914 Glarnisch (Finished) [Add new note]
· Uncompleted observations, not sufficient for including to the BinAstPhotSurvey sample. Petr [2014-03-14 13:33, Ondrejov]

· Joe Pollock observed this new target on one and half night in December, got a U = 3- solution:
http://www.asu.cas.cz/~asteroid/02914.png
It would be good to take more data (a few nights) to nail down it and to get double coverage. The object may be already too faint for Joe now, so I encourage others to help out.

Cheers, Petr [2014-01-23 08:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run on this new target from current list at 0045 from Prompt Tololo under good conditions. Hope to follow until ~0800 UT and then pick up again from SSO or Perth. Joe [2013-12-11 01:43, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(11842) Kapbos (Finished) - paired asteroid [Add new note]
· They are sufficient data for this one in this apparition. Cheers, Petr [2014-02-19 08:51, Ondrejov]

· I started a short run on this and hope to catch one rotation before the moon and clouds arrive.
Don [2014-02-18 01:39, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Began observing it at 16:30 UT. Nelya, Simeiz. [2014-02-04 17:16, Simeiz] Message sent to observers

· Good data taken for this paired asteroid in the current 3rd apparition by Ninel Gaftonyuk and Yura Krugly from Simeiz and by Don Pray from Sugarloaf Mountain:
http://www.asu.cas.cz/~asteroid/011842_13a.png
http://www.asu.cas.cz/~asteroid/011842_13b.png

They are sufficient data for this lunation. Taking one more period in the next lunation will be needed for spin&shape modeling.

Cheers, Petr [2014-01-02 09:13, Ondrejov]

· Looks like the weather in Massachusetts won't cooperate with you tonight Don. Will work from SRO tonight. [2014-01-01 19:28, Sonoita] Message sent to observers

· Starting a run at 02:30 UT.
Don [2014-01-01 01:13, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Target closed. [2012-10-01 09:55, Ondrejov]

· I observed 11842 from Prompt on JD 56160 from 0000-0420 UT before the clouds came in. Joe [2012-08-23 01:34, Dark Sky & PROMPT] Message sent to observers

· observed on the 08/16 and 08/19. Period is 3.74h [2012-08-21 10:58, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(6070) Rheinland (Finished) - paired asteroid [Add new note]
· Started a run at 23:15, Feb 6 UT. Hope to finish it for this lunation.
Don [2014-02-06 23:17, Sugarloaf] Message sent to observers

· Started a run on this in excellent conditions.
Don [2014-01-29 23:16, Sugarloaf]

· Jan Vrastil and Kamil Hornoch observed this paired asteroid sufficiently for this lunation from here:
http://www.asu.cas.cz/~asteroid/006070_13d.png

Taking last data (one period) for this apparition in the next lunation would be useful for further refining the asteroid's shape&spin model.

Clear Skies, Petr [2013-12-31 12:56, Ondrejov]

· Got a six hour run from Prompt-Tololo last night under excellent conditions. Joe [2013-11-23 18:31, Dark Sky & PROMPT] Message sent to observers

· Hi Don. Just to let you know, I got a full period run on this one last night from Tololo in case you had other targets you might want to go after. Best. Joe [2013-11-04 03:09, Dark Sky & PROMPT]

· Plan to start this at 06:45 UT.
Don [2013-11-04 02:51, Sugarloaf] Message sent to observers

· Began observing from Prompt Tololo at 0410 UT under excellent conditions. Joe [2013-11-03 04:11, Dark Sky & PROMPT]

· Done for this apparition. Petr [2009-12-15 12:30, Ondrejov]

· I plan to start a run on this at 05:00 UT.
Don [2009-08-18 02:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting a run on this at about 05:40 UT.
Don [2009-08-15 01:20, CarbuncleHill]

(16804) Bonini (Finished) [Add new note]
· Don Pray observed this new target on four nights: Unique period, no significant deviation,
http://www.asu.cas.cz/~asteroid/16804.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-01-25 10:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 02:00 UT.
Don [2014-01-23 04:00, Sugarloaf] Message sent to observers

· Did a run on this new target last night, and started again tonight at 02:40 UT.
Don [2014-01-10 03:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

(43339) 2000 RM10 (Finished) [Add new note]
· Six linked (accuracy 0.02 mag) nights by Don Pray from Sugarloaf Mountain revealed it to be a slow rotator, but period is rather uncertain (U = 2-),
http://www.asu.cas.cz/~asteroid/43339.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2014-01-24 11:50, Ondrejov]

· I started this at 00:20 UT as a secondary target.
Don [2013-12-11 00:54, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 01:00 UT as a secondary target.
DOn [2013-12-08 04:23, Sugarloaf]

· I started a run on this at 00:40 UT and should continue until 09:00.
Don [2013-12-04 01:09, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:10 UT. Last night was clouded out early.
Don [2013-11-30 02:33, Sugarloaf]

· I plan to begin this new target at 01:05 UT.
Don [2013-11-29 00:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2391) Tomita (Finished) [Add new note]
· Joe Pollock observed this new target with Prompt in Chile and from SSO Perth, Australia on five nights: Unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/02391.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2014-01-22 13:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Have two runs on this new object from current target list. Prompt Tololo on 56630 from 0150-0820 UT and Perth 56630 1320-1910 UT. Joe [2013-12-06 01:54, Dark Sky & PROMPT]

(12071) Davykim (Finished) [Add new note]
· Unsuccessfull attempt. [2014-01-15 12:02, Ondrejov]

· Observing from 16:30 UT. Gabo [2014-01-06 16:31, SkalnatePleso] [Remove]
Message sent to observers

· My new object this night from 17:00 UT. Gabo [2014-01-03 23:22, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(53008) 1998 VY5 (Finished) [Add new note]
· Julian Oey observed this new target on several nights, revealed it to be a slow rotator. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2014-01-15 09:03, Ondrejov]

· observed on the 01/03 and 01/05/2014. [2014-01-07 20:53, Blue Mountains Obs] Message sent to observers

· Further observations done on 12/07, 12/10, 12/11,12/29, 12/30. Period is 79.9h [2014-01-01 09:42, Blue Mountains Obs]

· observed on 12/06 for about 5 hours. No period derived yet but tending to curve downward over that time indicating a long rotational period. [2013-12-09 12:26, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

13921 Sgarbini (Finished) - Prime Suspect [Add new note]
· Target closed for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2014-01-15 08:56, Ondrejov]

· observed on 12/8,12/10,12/11,12/28. period is 7.36h. [2014-01-01 08:54, Blue Mountains Obs] Message sent to observers

· observed on 2 nights 12/02 and 12/03 but 3-4 hours duration each. [2013-12-04 12:32, Blue Mountains Obs]

· Began second night run on this returning prime suspect plus 16045 and 19666 as well at 0040 UT from Prompt Tololo. Hope to observe until ~0830 UT. Got full 8 hours on these last night. Joe [2013-11-30 00:41, Dark Sky & PROMPT] Message sent to observers

· Began run on this returning prime suspect at 0040 UT from Prompt Tololo. Hope to observe until ~0830 UT. Two other unknown period objects (16045 (H=12.5)and 19666 (H=13.4)) also in field. Joe [2013-11-29 01:02, Dark Sky & PROMPT] Message sent to observers

· Four nights by David from Hunters Hill give a U=2+ solution of 3.679 h or 7.36 h, see
http://www.asu.cas.cz/~asteroid/13921.png
To eliminate the ambiguity satisfactorily, data with errors about 0.01 mag would be needed. Since it is not likely that someone will take data with such accuracy for the fading asteroid in the next lunation, we are closing the target here now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-12-01 11:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:30UT to 16:23UT in poor conditions. Period refined to 7.363 +/- 0.003hrs. Noisy data. Canopus has fits at 3 other periods, 2 with better fits than 7.363 but the resulting plots are a mess.

Data sent to Petr and Peter for analysis. [2006-11-26 21:23, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 12:17UT to 16:59UT in average conditions. Period refined to 7.361 +/- 0.004hrs with an aplitude of 0.1 +/- 0.02 though some data is out to 0.04mag.

I cannot rule out deviations due to the noisiness of my data. [2006-11-26 11:23, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 12:17UT to 16:59UT in average conditions. Period refined to 7.361 +/- 0.004hrs with an aplitude of 0.1 +/- 0.02 though some data is out to 0.04mag.

I cannot rule out deviations due to the noisiness of my data. [2006-11-26 01:49, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:22UT to 17:10UT in average conditions. Period refined to 7.356 +/- 0.005hrs, however, other fits exits at 6.4hrs and thier 1/2 periods (3.2 and 3.6hrs)

Data sent to Petr and Peter for analysis. [2006-11-25 01:07, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:37UT to 17:16UT in poorish conditions. Period refined somewhat to 7.351 hrs but there are some 'events'. However, these events coincide with the end of sessions so I can't rule out observational problems given the targets low amplitude (0.1 +/- 0.025mag) and less than ideal observing conditions. Note that a good fit is also obtained for the half period. [2006-11-23 21:16, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:23UT to 17:15UT in ordinary conditions. Best fit looks like a Monomodal curve of 3.683hrs with a Bimodal fit at 7.358 +/- 0.009hrs and an amplitude of around 0.1 +/- 0.02mag. More data needed to resolve this one. [2006-11-22 21:44, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:38UT to 17:30UT in average conditions. The target appears to have a period somewhere between 3.6 and 7.8hrs where multiple fits were found. [2006-11-19 21:29, HuntersHill]

(22598) Francespearl (Finished) [Add new note]
· Unsuccessful. [2013-12-28 06:20, Ondrejov]

· Started a run at 00:50 UT.
Don [2013-12-27 02:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this one at 00:20 UT.
Don [2013-12-11 00:55, Sugarloaf]

· Started this new target at 01:00 and should run until 8:45.
Don [2013-12-08 04:25, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2384) Schulhof (Finished) - member of asteroid cluster/mini-family [Add new note]
· I observed this target for 5.5 hours last night and it could be finished for this lunation. Peter K. [2013-12-24 15:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done for the NEOSource project for this apparition. Petr [2012-12-10 09:12, Ondrejov]

· I just finished final run on this one. Best wishes, Kamil [2012-12-08 19:25, Ondrejov] Message sent to observers

· Observed for almost 2 hours tonight but clouds interferred a bit. Peter K. [2012-12-07 21:06, Ondrejov]

· Peter Kusnirak did this mini-family member for this lunation:
http://www.asu.cas.cz/~asteroid/02384_12b.png
http://www.asu.cas.cz/~asteroid/02384_12a.png

Taking one more night in November will be useful.

Cheers, Petr [2012-10-05 08:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying this one tonight. Peter K. [2012-10-04 19:21, Ondrejov] Message sent to observers

· This cluster (mini-family) member was done by Don Pray from Sugarloaf Mountain on two and by Zuzana Kanuchova and Marek Husarik from Skalnate Pleso on one night:
http://www.asu.cas.cz/~asteroid/02384_b2.png

Well done. It is more than enough for this lunation. Taking one more night in October will be good.

Cheers, Petr [2012-09-12 06:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a second run on this stating at 03:15 UT.
Don [2012-09-11 03:00, Sugarloaf]

· Plan to start at 03:30 UT.
Don [2012-09-10 02:04, Sugarloaf] Message sent to BinAstPhotSurvey conference

(5477) Holmes (Finished) - Returning Binary, 4th apparition [Add new note]
· Started run from Prompt Tololo ~0050 UT. Can get second half of phase 0.740 event centered at 0102 UT. Have only ~3 hour window (0055-0355 UT) each night. Event moves 25 minutes later each night so coverage will improve. Will try to get outside event light curve from Siding Spring. Phase 0.240 event available from Perth in similar window. At +27 Dec (and winter) would be much better for northern observers. Joe [2013-12-22 01:37, Dark Sky & PROMPT] Message sent to observers

· Joe Pollock observed this one with Prompt (Cerro Tololo) and with the RCOP (Perth, Australia) on four nights and Don Pray took one run from Sugarloaf Mountain in the past lunation: Good coverage for both events,
http://www.asu.cas.cz/~asteroid/05477_13b_porb.png

Continued event monitoring in the upcoming lunation will be useful for refining model; covering each of the two events twice per lunation should be sufficient. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-12-20 12.37 0.240
2013-12-21 12.80 0.240
2013-12-22 13.23 0.240
2013-12-23 13.66 0.240
2013-12-24 14.09 0.240
2013-12-25 14.52 0.240
2013-12-26 14.95 0.240
2013-12-27 15.38 0.240
2013-12-28 15.81 0.240
2013-12-29 16.24 0.240
2013-12-30 16.67 0.240
2013-12-31 17.10 0.240
2014- 1- 1 17.53 0.240
2014- 1- 2 17.96 0.240
2014- 1- 3 18.39 0.240
2014- 1- 4 18.82 0.240
2014- 1- 5 19.25 0.240
2014- 1- 6 19.68 0.240
2014- 1- 7 20.11 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2013-12-21 0.60 0.740
2013-12-22 1.03 0.740
2013-12-23 1.46 0.740
2013-12-24 1.89 0.740
2013-12-25 2.32 0.740
2013-12-26 2.75 0.740
2013-12-27 3.18 0.740
2013-12-28 3.61 0.740
2013-12-29 4.04 0.740
2013-12-30 4.47 0.740
2013-12-31 4.90 0.740
2014- 1- 1 5.33 0.740
2014- 1- 2 5.76 0.740
2014- 1- 3 6.19 0.740
2014- 1- 4 6.62 0.740
2014- 1- 5 7.05 0.740
2014- 1- 6 7.48 0.740
2014- 1- 7 7.91 0.740

Clear Skies, Petr [2013-12-19 09:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations at R-COP in Perth began at 1220 UT under good conditions and finished at 1730 UT. The 0.749 phase event has been covered for a second time. Joe [2013-11-26 23:17, Dark Sky & PROMPT] Message sent to observers

· Began observations at Prompt Tololo at 0050 UT under excellent conditions. Second run on 0.247 phase event centered tonight at 0214 UT. Joe [2013-11-26 01:05, Dark Sky & PROMPT]

· Observations at R-COP in Perth began at 1240 UT under good conditions. The 0.749 phase event centered at 1404 UT has been covered. Will hopefully continue until ~1730 UT. Joe [2013-11-25 16:05, Dark Sky & PROMPT] Message sent to observers

· Began observations at Prompt Tololo at 0040 UT under excellent conditions. Plan to cover 0.247 phase event centered at 0148 UT. Joe [2013-11-25 01:07, Dark Sky & PROMPT]

· Thorough observations were taken for this return binary by Don Pray from Sugarloaf Mountain and by Julian Oey from Leura, supported with one night by Jan Vrastil and Peter Kusnirak from here in the past lunation. Described the evolving events:
http://www.asu.cas.cz/~asteroid/05477_13a_porb.png
http://www.asu.cas.cz/~asteroid/05477_13a_p1.png

Events monitoring in this lunation will be useful for refining model; covering each of the two events twice per lunation should be sufficient. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-11-21 0.09 0.247
2013-11-22 0.52 0.247
2013-11-23 0.95 0.247
2013-11-24 1.38 0.247
2013-11-25 1.81 0.247
2013-11-26 2.24 0.247
2013-11-27 2.67 0.247
2013-11-28 3.10 0.247
2013-11-29 3.53 0.247
2013-11-30 3.96 0.247
2013-12- 1 4.39 0.247
2013-12- 2 4.82 0.247
2013-12- 3 5.25 0.247
2013-12- 4 5.68 0.247
2013-12- 5 6.11 0.247
2013-12- 6 6.54 0.247
2013-12- 7 6.97 0.247
2013-12- 8 7.40 0.247
2013-12- 9 7.83 0.247
2013-12-10 8.26 0.247
2013-12-11 8.69 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2013-11-21 12.34 0.749
2013-11-22 12.77 0.749
2013-11-23 13.20 0.749
2013-11-24 13.63 0.749
2013-11-25 14.06 0.749
2013-11-26 14.49 0.749
2013-11-27 14.92 0.749
2013-11-28 15.35 0.749
2013-11-29 15.78 0.749
2013-11-30 16.21 0.749
2013-12- 1 16.64 0.749
2013-12- 2 17.07 0.749
2013-12- 3 17.50 0.749
2013-12- 4 17.93 0.749
2013-12- 5 18.36 0.749
2013-12- 6 18.79 0.749
2013-12- 7 19.22 0.749
2013-12- 8 19.65 0.749
2013-12- 9 20.08 0.749
2013-12-10 20.51 0.749

Clear Skies, Petr [2013-11-19 13:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· only managed to observed the beginning of 0.248 phase event but daylight started. [2013-11-08 11:34, Blue Mountains Obs] Message sent to observers

· I'm planning a run on this starting at 04:15 UT to catch the 0.750 phase event.
Don [2013-11-08 00:24, Sugarloaf]

· If weather holds, I will cover 0.248 phase at 17.51 UT 11/06. [2013-11-06 13:20, Blue Mountains Obs] Message sent to observers

· Doing this one again tonight to strengthen the 0.750 phase event data. Starting at 02:00 UT.
Don [2013-11-05 01:29, Sugarloaf]

· I started a run on this at 02:30 UT to catch the 0.750 phase event at 4:30 UT.
Don [2013-11-04 02:27, Sugarloaf] Message sent to observers

· I plan to start this at 01:30 UT and should catch the 0.750 phase event at 3.69 UT.
Don [2013-11-01 23:05, Sugarloaf]

· Plan to observe 15 UT 0.248 phase event from Siding Spring if the weather cooperates. Joe [2013-10-31 06:16, Dark Sky & PROMPT] Message sent to observers

· observed on the 15th,25th and 28th October. most of the event captured on the 28th. [2013-10-29 05:26, Blue Mountains Obs]

· Don Pray took first night for this return binary in its current 4th apparition:
http://www.asu.cas.cz/~asteroid/05477_13a_porb.png
http://www.asu.cas.cz/~asteroid/05477_13a_p1.png

As usual, covering each of the two events twice per lunation would be good for refining model; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-13 7.62 0.248
2013-10-14 8.03 0.248
2013-10-15 8.45 0.248
2013-10-24 12.15 0.248
2013-10-25 12.57 0.248
2013-10-26 12.98 0.248
2013-10-27 13.39 0.248
2013-10-28 13.80 0.248
2013-10-29 14.21 0.248
2013-10-30 14.63 0.248
2013-10-31 15.04 0.248
2013-11- 1 15.45 0.248
2013-11- 2 15.86 0.248
2013-11- 3 16.27 0.248
2013-11- 4 16.69 0.248
2013-11- 5 17.10 0.248
2013-11- 6 17.51 0.248
2013-11- 7 17.92 0.248
2013-11- 8 18.33 0.248
2013-11- 9 18.75 0.248
2013-11-10 19.16 0.248
2013-11-11 19.57 0.248
2013-11-12 19.98 0.248
2013-11-13 20.39 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2013-10-13 19.86 0.750
2013-10-14 20.28 0.750
2013-10-15 20.69 0.750
2013-10-25 0.40 0.750
2013-10-26 0.81 0.750
2013-10-27 1.22 0.750
2013-10-28 1.63 0.750
2013-10-29 2.04 0.750
2013-10-30 2.46 0.750
2013-10-31 2.87 0.750
2013-11- 1 3.28 0.750
2013-11- 2 3.69 0.750
2013-11- 3 4.10 0.750
2013-11- 4 4.52 0.750
2013-11- 5 4.93 0.750
2013-11- 6 5.34 0.750
2013-11- 7 5.75 0.750
2013-11- 8 6.16 0.750
2013-11- 9 6.58 0.750
2013-11-10 6.99 0.750
2013-11-11 7.40 0.750
2013-11-12 7.81 0.750
2013-11-13 8.22 0.750
2013-11-14 8.64 0.750

Clear Skies, Petr [2013-10-13 06:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start a run at 03:55 UT.
Don [2013-10-12 03:18, Sugarloaf]

· Target closed for the 3rd apparition, the web pages updated accordingly. Petr [2012-06-11 14:16, Ondrejov]

· Good data were taken by Kamil Hornoch, Peter Kusnirak and Jan Vrastil from here, by Brian Warner from PDO, by Bob Stephens from GMARS and by Vasilij Chiorny from Kharkiv in April:
http://www.asu.cas.cz/~asteroid/05477_12b_porb.png
Good coverage of both events (thanks to the combined effort from the two continents for the 24.41-h orbital period).

Last observations for this apparition will be useful to take after the full moon, for refining its model; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 5-10 2.02 0.241
2012- 5-11 2.43 0.241
2012- 5-12 2.84 0.241
2012- 5-13 3.26 0.241
2012- 5-14 3.67 0.241
2012- 5-15 4.08 0.241
2012- 5-16 4.49 0.241
2012- 5-17 4.90 0.241
2012- 5-18 5.32 0.241
2012- 5-19 5.73 0.241
2012- 5-20 6.14 0.241
2012- 5-21 6.55 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2012- 5- 9 13.82 0.742
2012- 5-10 14.24 0.742
2012- 5-11 14.65 0.742
2012- 5-12 15.06 0.742
2012- 5-13 15.47 0.742
2012- 5-14 15.88 0.742
2012- 5-15 16.30 0.742
2012- 5-16 16.71 0.742
2012- 5-17 17.12 0.742
2012- 5-18 17.53 0.742
2012- 5-19 17.94 0.742
2012- 5-20 18.36 0.742

Clear Skies, Petr [2012-05-02 11:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 6 hours last night and 0.25-phase event covered. Peter K. [2012-04-28 06:23, Ondrejov] Message sent to observers

· The evolving primary event was observed by Kamil Hornoch from here on the past night:
http://www.asu.cas.cz/~asteroid/05477_12b_porb.png
Previously it was observed by Brian Warner from PDO more than one month ago, last on March 17,
http://www.asu.cas.cz/~asteroid/05477_12a_porb.png

More data for both the primary and the secondary events will be useful for refining its model; updated ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-26 20.76 0.245
2012- 4-27 21.17 0.245
2012- 4-28 21.58 0.245
2012- 4-29 21.99 0.245
2012- 4-30 22.41 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-27 8.95 0.745
2012- 4-28 9.36 0.745
2012- 4-29 9.78 0.745
2012- 4-30 10.19 0.745

Clear Skies, Petr [2012-04-26 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· We plan to get full-night run covering the primary event for this one. Best wishes, Kamil and Adrian [2012-04-25 18:08, Ondrejov] Message sent to observers

· Good data for the primary event by Brian Warner from PDO and for the secondary event by Peter Kusnirak from here were taken in this 3rd apparition of the binary:
http://www.asu.cas.cz/~asteroid/05477_12_porb.png

Taking more data for both events (best to cover each of the two events twice, plus some data outside events) in this month will be good for refining its model; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-10 14.60 0.247
2012- 4-11 15.03 0.247
2012- 4-12 15.46 0.247
2012- 4-13 15.89 0.247
2012- 4-14 16.31 0.247
2012- 4-15 16.74 0.247
2012- 4-16 17.17 0.247
2012- 4-17 17.60 0.247
2012- 4-18 18.03 0.247
2012- 4-19 18.45 0.247
2012- 4-20 18.88 0.247
2012- 4-21 19.31 0.247
2012- 4-22 19.74 0.247
2012- 4-23 20.17 0.247
2012- 4-24 20.59 0.247
2012- 4-25 21.02 0.247
2012- 4-26 21.45 0.247
2012- 4-27 21.88 0.247
2012- 4-28 22.31 0.247
2012- 4-29 22.73 0.247
2012- 4-30 23.16 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2012- 4-10 2.33 0.745
2012- 4-11 2.76 0.745
2012- 4-12 3.18 0.745
2012- 4-13 3.61 0.745
2012- 4-14 4.04 0.745
2012- 4-15 4.47 0.745
2012- 4-16 4.90 0.745
2012- 4-17 5.32 0.745
2012- 4-18 5.75 0.745
2012- 4-19 6.18 0.745
2012- 4-20 6.61 0.745
2012- 4-21 7.04 0.745
2012- 4-22 7.46 0.745
2012- 4-23 7.89 0.745
2012- 4-24 8.32 0.745
2012- 4-25 8.75 0.745
2012- 4-26 9.18 0.745
2012- 4-27 9.60 0.745
2012- 4-28 10.03 0.745
2012- 4-29 10.46 0.745
2012- 4-30 10.89 0.745

Clear Skies, Petr [2012-04-04 08:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 18:45 to 0 UT with 0.75-phase event covered. Peter K. [2012-03-28 00:17, Ondrejov] Message sent to observers

· Extensive data by Brian Warner from PDO plus one night by Peter Kusnirak from here were taken in this 3rd apparition for the binary; Brian covered the 0.25-phase event a few times:
http://www.asu.cas.cz/~asteroid/05477_12_porb.png
http://www.asu.cas.cz/~asteroid/05477_12_p1.png

Observations especially of the 0.75-phase event are needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-23 6.92 0.248
2012- 3-24 7.35 0.248
2012- 3-25 7.78 0.248
2012- 3-26 8.21 0.248
2012- 3-27 8.63 0.248
2012- 3-28 9.06 0.248
2012- 3-29 9.49 0.248
2012- 3-30 9.92 0.248
2012- 3-31 10.35 0.248
2012- 4- 1 10.77 0.248
2012- 4- 2 11.20 0.248
2012- 4- 3 11.63 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-22 18.70 0.748
2012- 3-23 19.12 0.748
2012- 3-24 19.55 0.748
2012- 3-25 19.98 0.748
2012- 3-26 20.41 0.748
2012- 3-27 20.84 0.748
2012- 3-28 21.26 0.748
2012- 3-29 21.69 0.748
2012- 3-30 22.12 0.748
2012- 3-31 22.55 0.748
2012- 4- 1 22.98 0.748
2012- 4- 2 23.40 0.748

Clear Skies, Petr [2012-03-22 12:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20 UT tonight. Peter K. [2012-03-21 00:01, Ondrejov] Message sent to observers

· I got a short night last night and will continue to work this as much as possible for the apparition. [2012-03-06 19:51, PalmerDivide] Message sent to BinAstPhotSurvey conference

(3850) Peltier (Finished) - Returning prime suspect [Add new note]
· This return "prime suspect" was done by Joe Pollock with Prompt and by Fred Vachier from Pic du Midi in its 2nd apparition. The data are somewhat marginal for its low amplitude, but they give the same period estimate as from the first apparition, with sufficient coverage, no deviation seen,
http://www.asu.cas.cz/~asteroid/03850_b3.png
Cf. with the data by Julian Oey from the 1st apparition (when the asteroid was brighter):
http://www.asu.cas.cz/~asteroid/03850.png

Target closed for this apparition.

Cheers, Petr [2013-12-17 10:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Have two runs on this prime suspect on current target list from Prompt Tololo on 56628 (0110-0815 UT) and 56629 (0230-0830 UT). Joe [2013-12-06 02:07, Dark Sky & PROMPT] Message sent to observers

· This one has been done well by Julian from Leura. A U=3- period solution, good coverage, no significant deviation seen. It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Julian.

Cheers, Petr [2006-10-20 09:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 10:04 to 16:04 UT 18/10. Light curve fit well into a period 2.4288h. Data sent in for inclusion.
Julian [2006-10-19 23:38, Blue Mountains Obs]

· previous session finished at 16:32 UT.
observed this object again from 10:19 to 17:48 UT 01/10. period refined to 2.428h +/- 0.002 h. with amplitude of 0.10 mag+/- 0.04 mag. 1st night session excluded due to a very bright star which have adversely effected the light curve.
Data sent in to Petr/Peter [2006-10-02 10:54, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed until 16:18UT. Preliminary period shows bimodal curve of period 2.39h and amplitude of 0.08mag.
Started again tonight at 10:41 UT. [2006-09-29 11:41, Blue Mountains Obs]

· Started this target tonight at 10:52 UT. Clear weather expect full 8 hour session. [2006-09-28 11:27, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(15365) 1996 HQ9 (Finished) [Add new note]
· About to finish a 7 hour run from Prompt Tololo on this new target from current list. Hope to get similar run from Prompt Siding Spring starting about 1015 UT. Joe [2013-12-10 07:57, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(4641) Ayako (Finished) [Add new note]
· Don Pray did this new target from Sugarloaf Mountain on three nights: Unique period, good coverage, no substantial deviation,
http://www.asu.cas.cz/~asteroid/04641.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-12-09 09:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target at 00:40 UT.
Don [2013-12-04 01:11, Sugarloaf]

(3589) Loyola (Finished) [Add new note]
· Got ~3 hours from Perth last night on this new target from the current list. About to start run on it from Prompt Tololo in about 45 minutes. Joe [2013-12-09 00:18, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(14596) Bergstralh (Finished) [Add new note]
· Have three runs on this new object from current target list. Prompt Tololo on 56627 from 0100-0830 UT, Prompt Siding Spring on 56627 from 1045-1345 UT and Perth 56628 1650-1850 UT. Joe [2013-12-06 01:38, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(8503) Masakatsu (Finished) [Add new note]
· Began run on this new object from current target list from Prompt Tololo at 0130 UT under excellent conditions. Hope to follow until 0830 UT, then pick up again from Siding Spring or Perth. Joe [2013-12-06 01:33, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(46654) 1995 UB8 (Finished) [Add new note]
· This new target was worked by Kamil Hornoch, Peter Kusnirak and Jan Vrastil from here and by Don Pray from Sugarloaf Mountain: Unique solution, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/46654.png
Done for the Survey.

Cheers, Petr [2013-12-02 09:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· I began a run on this at 00:40 UT as a secondary target.
Don [2013-11-29 00:40, Sugarloaf]

· I started this at 01:20 UT under clear, but somewhat breezy conditions.
Don [2013-11-25 01:19, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 01:45 UT and hopefully will go to 10:45.
Don [2013-11-13 03:31, Sugarloaf]

· Starting this new target at 02:00 UT.
Don [2013-11-09 01:34, Sugarloaf] Message sent to BinAstPhotSurvey conference

(163364) 2002 OD20 (Finished) [Add new note]
· Unsuccessfull case, closing it. [2013-11-19 14:46, Ondrejov]

· observations done on 07/01 and 07/02 . [2013-07-03 04:45, Blue Mountains Obs] Message sent to observers

· observed from 11.48 UT for 4 hours 06/19 [2013-06-20 04:59, Blue Mountains Obs]

· observed the new target from 10UT for 6 hours 06/17. excellent condition and good data. Period is 2.455h amplitude 0.1m [2013-06-18 00:30, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(1387) Kama (Finished) [Add new note]
· This new target has turned out to be a slow rotator per observations by Don Pray from Sugarloaf Mountain, by Julian Oey from Leura, and by Jan Vrastil and Peter Kusnirak from here. The linked data showed some discrepancies around the lightcurve minima, but they might be due to changing solar phase and aspect so there is no conclusive evidence on tumbling.
http://www.asu.cas.cz/~asteroid/01387.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-11-18 14:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run as a secondary target at 02:00 UT.
Don [2013-09-04 03:15, Sugarloaf]

· I'll be starting this at 03:00 UT. It seems to have a period around 50 hr.
Don [2013-08-15 02:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

· This one is some multiple of 24 hours, so I can't do any more on it from here. Help would be appreciated from another longitude. Thanks!

Don [2013-08-07 15:04, Sugarloaf]

· I'll be starting a third run on this at 03:40 UT.
Don [2013-08-06 02:37, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start on this at 03:40 UT.
Don [2013-08-05 02:26, Sugarloaf]

· I'll be starting this new target at 03:40 UT.
Don [2013-08-04 02:32, Sugarloaf] Message sent to BinAstPhotSurvey conference

(21509) Lucascavin (Finished) - cluster/mini-family member [Add new note]
· Peter Kusnirak did this NEOSource targets on two nights:
http://www.asu.cas.cz/~asteroid/21509.png

This is sufficient data for it; target closed.

Cheers, Petr [2013-11-04 13:30, Ondrejov]

· Started with this new target tonight (observing from 22:30 UT). Peter K. [2013-10-30 23:26, Ondrejov] Message sent to BinAstPhotSurvey conference

(16598) 1992 YC2 (Finished) - cluster/mini-family member [Add new note]
· This target was observed on 7 nights from Abastumani (2), Ondrejov (2), SRO (2) and SugarloafM. Obs. (1) and its coverage is sufficient for task. Target is finished.

http://www.asu.cas.cz/~asteroid/16598.png

Peter K. [2013-10-31 03:29, Ondrejov] Message sent to observers

· Observed for almost 3 hours last night (cut by fog) in less than average conditions with high clouds and Moon not helping much. Peter K. [2013-10-15 05:13, Ondrejov]

· My observation from the last night shows a period of 3.95 h and ampl. 0.3 mag. Peter K. [2013-10-14 04:39, Ondrejov] Message sent to BinAstPhotSurvey conference

(3060) Delcano (Finished) [Add new note]
· This new target was done by Julian Oey from Leura on 7 (mostly partial) nights, supported with one partial night by Jan Vrastil from here: Unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/03060.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-10-10 09:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· 3 nights session 08/08,08/10, 08/11 each about 2.5-3 hours long sessions. Period 2.8022h, 0.18m amplitude. [2013-08-12 11:35, Blue Mountains Obs]

(8992) Magnanimity (Finished) [Add new note]
· Don Pray worked this new target from Sugarloaf Mountain on 16 nights (partly as a secondary target): Unique, longish period, good coverage, no obvious deviation from the single periodicity,
http://www.asu.cas.cz/~asteroid/08992.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-10-04 11:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one at 00:45 UT and running along with 9737.
Don [2013-10-03 00:26, Sugarloaf]

· I'm running this one along with 76818.
Don [2013-09-29 23:42, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Doing this one as another secondary target tonight.
Don [2013-09-04 03:16, Sugarloaf]

· I'll be starting a run on this at 02:15 UT.
Don [2013-08-25 02:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting a run at 02:50 UT.
Don [2013-08-17 02:39, Sugarloaf]

· I'll be doing a second run on this tonight starting around 02:50 UT. It looks like a fairly slow rotator, but I have no idea how slow as yet.
Don [2013-08-12 01:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· What a great name. I plan to start this new target at 03:10 UT.
Don [2013-08-11 00:46, Sugarloaf]

(9737) Dudarova (Finished) [Add new note]
· This new target looked suspect at first, so it was worked extensively by Don Pray from Sugarloaf Mountain and by Julian Oey from Leura, supported with two nights by Audrey Thirouin from Sierra Nevada Observatory. Finally we found that it has a quadrumodal lightcurve (U = 2+ solution),
http://www.asu.cas.cz/~asteroid/09737_13b.png
http://www.asu.cas.cz/~asteroid/09737_13a.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work folks on the tough target.

Petr [2013-10-04 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 02/10 and 03/10 for 2.5h and 4h respectively. [2013-10-03 23:16, Blue Mountains Obs] Message sent to observers

· I started this at 00:00 UT. I expect to get 5 hours on it.
Don [2013-10-03 00:28, Sugarloaf] Message sent to BinAstPhotSurvey conference

· observed on 2 nights 09/27 and 09/30 for about 4 hours each. [2013-10-01 07:46, Blue Mountains Obs] Message sent to observers

· I'll be starting this at 00:10 UT as a secondary target.
Don [2013-09-26 23:49, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this at 00:10 UT, Sept 25.
Don [2013-09-24 23:30, Sugarloaf]

· I did a run last night on this and will do another tonight in hopes of detecting an elusive binary event. Running this as a secondary target.
Don [2013-09-24 01:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:50. Hopefully, I'll get field images to link all my sessions.
Don [2013-09-15 02:03, Sugarloaf]

· Started a run at 01:15 UT.
Don [2013-09-09 02:24, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run at about 01:20 UT.
Don [2013-09-07 02:31, Sugarloaf]

· Don Pray observed this new target on 7 nights (full or partial). There is a period of 7.16 h (or 1.5x, or 2x that), but there are apparent deviations that Don thinks are real but which we cannot make sense of.
http://www.asu.cas.cz/~asteroid/09737.png
He needs a help from other stations. Unfortunately we at Ondrejov will be busy with two NEOSource priority targets 8306 and 2100 for at least the next couple nights, the guys at Skalnate Pleso are out (an upgrade of the control system of their 0.6-m taking more time than anticipated), and the folks in Modra are mostly busy with their other project. Someone else who could help Don?

Petr [2013-09-06 07:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:00 UT.
Don [2013-09-06 01:03, Sugarloaf]

· Started this one at 01:10 UT.
Don [2013-09-05 01:08, Sugarloaf]

· I started a run at 01:15 UT and should get close to 8 hours on if all goes well. [2013-09-04 03:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray took four nights (3.1 to 6.3 h long), but no satisfactory solution yet. It is a little bit suspicious. I encourage other observers to help out.

Clear Skies, Petr [2013-08-26 06:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 02:00 UT.
Don [2013-08-25 02:05, Sugarloaf]

· Started a run on this at 02:40 UT.
Don [2013-08-17 02:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be starting this new target a few minutes after 8992.
Don [2013-08-12 01:08, Sugarloaf]

(43904) 1995 WO (Finished) [Add new note]
· Julian Oey observed this new target from Leura on 13 nights. His linked data reveal a long period on an order of 200 hours; see a composite lightcurve with the data folded with half period:
http://www.asu.cas.cz/~asteroid/43904.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Good work Julian on another slow rotator.
Petr [2013-09-16 07:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· continued observations on07/28,07/29,08/03,08/04,08/05 showing a possible period of 3.85h with a very shallow 0.06m amplitude. [2013-08-07 12:13, Blue Mountains Obs] Message sent to observers

· started new target 07/26 12.5UT to 18.5UT. 0.1 amplitude. [2013-07-28 02:16, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(12854) 1998 HA13 (Finished) [Add new note]
· Low amplitude, long(ish) period; unsuccessfull case. Petr [2013-09-09 09:48, Ondrejov]

· observed on 08/05. period 51.74h amplitude is 0.3m. data sent through. [2013-08-07 13:12, Blue Mountains Obs] Message sent to observers

· 2 more nights 08/03 and 08/04 still show that the period is at 51.3h [2013-08-05 08:34, Blue Mountains Obs]

· observed on 07/29, 08/01, 08/02, possible long period >50h amplitude 0.4m [2013-08-05 06:40, Blue Mountains Obs] Message sent to observers

· Planning to observe tonight from ~21UT, in good conditions. Juraj [2013-07-31 19:11, Modra]

· Planning to observe tonight from ~21UT, in good conditions. Jozef [2013-07-28 20:08, Modra]

· observed on both 26th and 27th July. good condition low 0.1m amplitude. [2013-07-28 02:14, Blue Mountains Obs] Message sent to observers

· Started a new target here tonight, good conditions. Jozef [2013-07-27 22:29, Modra]

(4923) Clarke (Finished) [Add new note]
· This new target was worked by Peter Kusnirak and Jan Vrastil from here and by Don Pray from Sugarloaf Mountain, got a U = 2- result:
http://www.asu.cas.cz/~asteroid/04923.png

Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work guys on the tough target.

Petr [2013-08-27 08:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one along with 1387.
Don [2013-08-15 02:08, Sugarloaf]

· Observed as secondary target last night. Peter K. [2013-08-11 06:53, Ondrejov] Message sent to observers

· Plan to start this new target at 05:30 UT.
Don [2013-07-05 02:14, Sugarloaf] Message sent to BinAstPhotSurvey conference

(8993) Ingstad (Finished) [Add new note]
· This new target was done by Peter Kusnirak from here, by Michal Pikler and Marek Husarik from Skalnate Pleso, and by Don Pray from Sugarloaf Mountain: Unique period, sufficient coverage, no deviation,
http://www.asu.cas.cz/~asteroid/08993.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-07-23 08:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:00 UT in average conditions at the moment. Michal [2013-07-18 22:52, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 21:45 UT in a relatively good conditions. Michal [2013-07-17 21:46, SkalnatePleso] [Remove]

· Peter Kusnirak took the first night for this new target:
http://www.asu.cas.cz/~asteroid/08993.png
We have only one more night (07-19.0) scheduled here at Ondrejov before the full moon. (Our first night after the full moon will be 07-30.0.) For sufficient coverage, we would appreciate if some of you could help us with taking a couple nights (errors not greater than 0.02 mag). Many thanks in advance.

Clear Skies, Petr [2013-07-17 09:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this new target at 21:45 UT. Peter K. [2013-07-16 22:03, Ondrejov]

(125742) 2001 XT117 (Finished) - slow rotator [Add new note]
· Observations by Julian Oey from Leura and Joe Pollock with Prompt showed this new target being a slow rotator. Put it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
and closed for the Survey.

Petr [2013-07-18 10:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· New target. Long period with estimated period >25h and amplitude >1m. [2013-07-04 00:22, Blue Mountains Obs]

(5095) Escalante (Finished) [Add new note]
· Don Pray took six nights for this new target; a U=2 solution: http://www.asu.cas.cz/~asteroid/05095.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2013-07-18 09:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 01:30 UT.
Don [2013-07-05 02:12, Sugarloaf]

· I started a run on this at 01:40 UT as a secondary target.
Don [2013-06-13 02:01, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run at 01:40 UT.
Don [2013-06-04 02:07, Sugarloaf]

· Started a run at 02:00 UT.
Don [2013-06-01 01:42, Sugarloaf]

· I started this new target at 02:00 UT.
Don [2013-05-31 02:37, Sugarloaf] Message sent to BinAstPhotSurvey conference

(285263) 1998 QE2 (Finished) - NEO Binary [Add new note]
· Observing it from 20:55 UT under variable cloud covering.
Stefan [2013-07-14 01:21, Modra]

· Observing it from 21:09 UT.
Stefan [2013-07-12 21:35, Modra]

· Observing it from 20:35 UT.
Leos/Stefan [2013-07-11 21:00, Modra]

· Planning this one tonight. Jozef. [2013-07-04 20:12, Modra]

· Started a run at 01:40 UT.
Don [2013-06-20 01:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Another night added tonight. Adrian [2013-06-19 21:43, Modra]

· Observed this object several times from 7-12.6. Data sent in. Jozef. [2013-06-19 12:57, Modra]

· I will try this tonight because due to some clouds (though thin) I am afraid that 163249 could be too noisy here. Adrian [2013-06-18 20:37, Modra] Message sent to observers

· The radar observations on this are done, as it's leaving the Arecibo sky. Additional lightcurves to extend the arc are still useful. -Mike [2013-06-13 13:56, Arecibo Observatory] Message sent to BinAstPhotSurvey conference

· Started a run at 01:40 UT.
Don [2013-06-13 02:00, Sugarloaf]

· Started a run at 01:40 UT, and should get 6.5h on it.
Don [2013-06-10 01:56, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I did a run on this last night (June 9 UT) and found a preliminary period of 4.589 hours. Amplitude is about 0.2 mag. No obvious deviations. I may be able to observe it again tonight.

Don [2013-06-09 19:51, Sugarloaf] Message sent to BinAstPhotSurvey conference

(6708) Bobbievaile (Finished) - not binary [Add new note]
· A correct solution put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2013-07-11 05:12, Ondrejov]

· Two more sessions by Don Pray from Sugarloaf Mountain joined in:
http://www.asu.cas.cz/~asteroid/06708_13_porb.png
http://www.asu.cas.cz/~asteroid/06708_13_p1.png

More data would be still useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 6-26 20.71 0.257
2013- 6-27 21.39 0.257
2013- 6-28 22.07 0.257
2013- 6-29 22.75 0.257
2013- 6-30 23.44 0.257
2013- 7- 2 0.12 0.257
2013- 7- 3 0.80 0.257
2013- 7- 4 1.48 0.257
2013- 7- 5 2.16 0.257
2013- 7- 6 2.85 0.257
2013- 7- 7 3.53 0.257
2013- 7- 8 4.21 0.257
2013- 7- 9 4.89 0.257
2013- 7-10 5.57 0.257
2013- 7-11 6.26 0.257
2013- 7-12 6.94 0.257
2013- 7-13 7.62 0.257
2013- 7-14 8.30 0.257
2013- 7-15 8.98 0.257

Date/Time UTC (LTc.) Phase
--------------------------
2013- 6-27 9.06 0.758
2013- 6-28 9.74 0.758
2013- 6-29 10.43 0.758
2013- 6-30 11.11 0.758
2013- 7- 1 11.79 0.758
2013- 7- 2 12.47 0.758
2013- 7- 3 13.15 0.758
2013- 7- 4 13.84 0.758
2013- 7- 5 14.52 0.758
2013- 7- 6 15.20 0.758
2013- 7- 7 15.88 0.758
2013- 7- 8 16.56 0.758
2013- 7- 9 17.25 0.758
2013- 7-10 17.93 0.758
2013- 7-11 18.61 0.758
2013- 7-12 19.29 0.758
2013- 7-13 19.97 0.758
2013- 7-14 20.66 0.758
2013- 7-15 21.34 0.758

Clear Skies, Petr [2013-06-18 11:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:20 UT.
Don [2013-06-04 02:06, Sugarloaf]

· First observations for this return binary in its current 3rd apparition were taken by Don Pray from Sugarloaf Mountain and Vasilij Chiorny from Kharkiv, supported with one short run by Kamil Hornoch from here:
http://www.asu.cas.cz/~asteroid/06708_13_porb.png

The 0.25-phase event has been reasonably covered by Don on May 31 and June 1, but more data for the 0.75-phase one are needed; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 6- 4 5.68 0.256
2013- 6- 5 6.36 0.256
2013- 6- 6 7.04 0.256
2013- 6- 7 7.73 0.256
2013- 6- 8 8.41 0.256
2013- 6- 9 9.09 0.256
2013- 6-10 9.77 0.256
2013- 6-11 10.45 0.256
2013- 6-12 11.14 0.256
2013- 6-13 11.82 0.256
2013- 6-14 12.50 0.256
2013- 6-15 13.18 0.256
2013- 6-16 13.86 0.256
2013- 6-17 14.55 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2013- 6- 3 17.35 0.757
2013- 6- 4 18.03 0.757
2013- 6- 5 18.72 0.757
2013- 6- 6 19.40 0.757
2013- 6- 7 20.08 0.757
2013- 6- 8 20.76 0.757
2013- 6- 9 21.44 0.757
2013- 6-10 22.13 0.757
2013- 6-11 22.81 0.757
2013- 6-12 23.49 0.757
2013- 6-14 0.17 0.757
2013- 6-15 0.85 0.757
2013- 6-16 1.54 0.757
2013- 6-17 2.22 0.757
2013- 6-18 2.90 0.757

Clear Skies, Petr [2013-06-03 11:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:20 UT.
Don [2013-06-01 01:41, Sugarloaf]

· I started a run at 01:10 UT.
Don [2013-05-31 02:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed this one about 4 hours - from 20 hr U.T.
Vasilij Ch. [2013-05-29 23:42, Kharkiv] Message sent to observers

· Started a 5 hour+ run on this at 02:30 UT.
Don [2013-05-18 02:17, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I did a very short run on this on May 14. Clouds interfered.
Don [2013-05-14 23:15, Sugarloaf]

· A third apparition will be needed for this one before modeling can be attempted. Petr [2012-04-02 11:03, Ondrejov]

· Only limited data have been taken for this return binary in its current apparition so far, not allowing to do an exact decomposition of the lightcurve; tentative plots:
http://www.asu.cas.cz/~asteroid/06708_12a_porb.png
http://www.asu.cas.cz/~asteroid/06708_12b_porb.png

It would be useful to take more data (errors 0.03 mag) after the moon is out of the way, but only long coverage (both in and outside events) would be really useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-12 0.06 0.247
2012- 3-13 0.74 0.247
2012- 3-14 1.43 0.247
2012- 3-15 2.11 0.247
2012- 3-16 2.79 0.247
2012- 3-17 3.47 0.247
2012- 3-18 4.15 0.247
2012- 3-19 4.84 0.247
2012- 3-20 5.52 0.247
2012- 3-21 6.20 0.247
2012- 3-22 6.88 0.247
2012- 3-23 7.56 0.247
2012- 3-24 8.25 0.247
2012- 3-25 8.93 0.247
2012- 3-26 9.61 0.247
2012- 3-27 10.29 0.247
2012- 3-28 10.97 0.247
2012- 3-29 11.66 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2012- 3-12 12.46 0.750
2012- 3-13 13.15 0.750
2012- 3-14 13.83 0.750
2012- 3-15 14.51 0.750
2012- 3-16 15.19 0.750
2012- 3-17 15.87 0.750
2012- 3-18 16.56 0.750
2012- 3-19 17.24 0.750
2012- 3-20 17.92 0.750
2012- 3-21 18.60 0.750
2012- 3-22 19.28 0.750
2012- 3-23 19.97 0.750
2012- 3-24 20.65 0.750
2012- 3-25 21.33 0.750
2012- 3-26 22.01 0.750
2012- 3-27 22.69 0.750
2012- 3-28 23.38 0.750
2012- 3-30 0.06 0.750

Clear Skies, Petr [2012-03-05 13:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 18 UT hoping in full-night run. Should cover most of its primary light curve, if weather hold. Best wishes, Kamil [2012-02-26 18:38, Ondrejov] Message sent to observers

· Observing this one + (14627) tonight. Best wishes, Kamil and Honza [2012-02-20 20:05, Ondrejov]

· Good data from the 2nd night, Adrian:
http://www.asu.cas.cz/~asteroid/06708_12_porb.png
The different apparent levels before and after the event are likely due to the primary's rotation that we cannot fit yet; a good coverage also outside events will be needed so that we can solve it.

Events ephemeris was given here a few days ago (see the note below on this page).

Clear Skies, Petr [2012-02-03 10:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· data from 09:15-12:10UT was very noisy and may not be useful. [2012-02-02 13:50, Via Capote] Message sent to observers

· will attempt this target tonight from 03:45-12:30UT with good forecast conditions. [2012-02-02 02:03, Via Capote]

· After discussions with closeby stations (Ondrejov & Skalnate Pleso) I am observing this tonight, though some tiny clouds may enhance noise and even completely damage my attempts. Adrian [2012-02-01 20:11, Modra] Message sent to observers

· Great first run for this return binary in this apparition, Adrian. Your data folded with the orbit period we estimated in the 2009 discovery apparition:
http://www.asu.cas.cz/~asteroid/06708_12_porb.png
Comparing it with the data from 2009,
http://www.asu.cas.cz/~asteroid/06708_porb.png
http://www.asu.cas.cz/~asteroid/06708_p1.png
it looks that some 2/3 of your run were actually in event. As there is just a fraction of the 8.2-h primary period covered outside event, I cannot fit the observations with the 2-period model yet, at least one full night covering phases outside events is needed. Of course, with the orbit period of 24.68 h, you cannot cover it much outside events during the few nights in the rest of this lunation, but it will be possible to cover it from here in Europe in the next lunation, or perhaps someone from another continent will help out us. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-31 21.73 0.258
2012- 2- 1 22.41 0.258
2012- 2- 2 23.09 0.258
2012- 2- 3 23.77 0.258
2012- 2-11 4.55 0.258
2012- 2-12 5.23 0.258
2012- 2-13 5.91 0.258
2012- 2-14 6.59 0.258
2012- 2-15 7.28 0.258
2012- 2-16 7.96 0.258
2012- 2-17 8.64 0.258
2012- 2-18 9.32 0.258
2012- 2-19 10.00 0.258
2012- 2-20 10.69 0.258
2012- 2-21 11.37 0.258
2012- 2-22 12.05 0.258
2012- 2-23 12.73 0.258
2012- 2-24 13.41 0.258
2012- 2-25 14.10 0.258
2012- 2-26 14.78 0.258
2012- 2-27 15.46 0.258
2012- 2-28 16.14 0.258
2012- 2-29 16.82 0.258
2012- 3- 1 17.51 0.258
2012- 3- 2 18.19 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2012- 2- 1 10.06 0.758
2012- 2- 2 10.74 0.758
2012- 2- 3 11.42 0.758
2012- 2- 4 12.10 0.758
2012- 2-11 16.88 0.758
2012- 2-12 17.56 0.758
2012- 2-13 18.24 0.758
2012- 2-14 18.92 0.758
2012- 2-15 19.61 0.758
2012- 2-16 20.29 0.758
2012- 2-17 20.97 0.758
2012- 2-18 21.65 0.758
2012- 2-19 22.33 0.758
2012- 2-20 23.02 0.758
2012- 2-21 23.70 0.758
2012- 2-23 0.38 0.758
2012- 2-24 1.06 0.758
2012- 2-25 1.74 0.758
2012- 2-26 2.43 0.758
2012- 2-27 3.11 0.758
2012- 2-28 3.79 0.758
2012- 2-29 4.47 0.758
2012- 3- 1 5.15 0.758
2012- 3- 2 5.84 0.758

Clear Skies, Petr [2012-01-31 14:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan this tonight as 5407 is near background stars at desired times. Adrian [2012-01-30 18:26, Modra]

· Observing it from ~20:45 UT.

Jozef/Stefan [2009-05-24 22:26, Modra] Message sent to observers

· My object today is this object. Gabo [2009-05-23 22:23, SkalnatePleso] [Remove]

· Observing from ~21:40 UT. Jozef, Stefan [2009-05-23 21:43, Modra]

· Observing from ~22:40 UT. Jozef [2009-05-20 22:49, Modra]

· Our discovery announcement on the binary has appeared on CBET 1794, copied below. I am going to update our web pages accordingly.

Cheers, Petr Pravec

(6708) BOBBIEVAILE
D. Pray, Carbuncle Observatory, W. Brookfield, MA, U.S.A.; K. Hornoch,
P. Kusnirak, and P. Pravec, Ondrejov Observatory; V. Chiorny and Yu. Krugly,
Kharkiv Observatory; M. Husarik and M. Pikler, Skalnate Pleso Observatory;
F. Marchis, B. Macomber, and M. Kislak, SETI Institute and University of
California at Berkeley; and J. Vilagi and S. Gajdos, Modra Observatory,
report that photometric observations obtained during Apr. 16 to May 3 reveal
that minor planet (6708) is a binary system with an orbital period of
24.7 hr. The primary shows a period of 8.221 ± 0.002 hr, assuming a bi-
modal lightcurve, and it has a lightcurve amplitude of 0.08 mag, suggesting
a nearly spheroidal shape. Mutual eclipse/occultation events with a depth
of 0.31 mag indicate a lower limit on the secondary-to-primary mean-diameter
ratio of 0.57. The mean absolute R-band magnitude of the system is H =
12.81 ± 0.14, assuming G = 0.25 ± 0.2.

2009 May 7 (CBET 1794) Daniel W. E. Green [2009-05-13 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Was able to record full 0.760 phase event. Joe [2009-05-13 08:43, Dark Sky & PROMPT]

· I've begun a run with Prompt and should be able to get the entire event that is centered on 0500 UT tonight assuming the GRB gods are kind and the weather holds. Joe [2009-05-13 00:04, Dark Sky & PROMPT]

· Monitoring events in the next lunation will be useful. The events may evolve and it may allow us to refine the D_2/D_1 estimate and it will also contribute to modeling in future. Covering each of the events twice during the lunation could suffice. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 5-13 17.46 0.265
2009- 5-14 18.16 0.265
2009- 5-15 18.86 0.265
2009- 5-16 19.56 0.265
2009- 5-17 20.26 0.265
2009- 5-18 20.96 0.265
2009- 5-19 21.66 0.265
2009- 5-20 22.36 0.265
2009- 5-21 23.06 0.265
2009- 5-22 23.76 0.265
2009- 5-24 0.46 0.265
2009- 5-25 1.16 0.265
2009- 5-26 1.86 0.265
2009- 5-27 2.56 0.265
2009- 5-28 3.26 0.265
2009- 5-29 3.96 0.265
2009- 5-30 4.66 0.265
2009- 5-31 5.36 0.265
2009- 6- 1 6.06 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2009- 5-13 5.00 0.760
2009- 5-14 5.70 0.760
2009- 5-15 6.40 0.760
2009- 5-16 7.10 0.760
2009- 5-17 7.80 0.760
2009- 5-18 8.50 0.760
2009- 5-19 9.20 0.760
2009- 5-20 9.90 0.760
2009- 5-21 10.60 0.760
2009- 5-22 11.30 0.760
2009- 5-23 12.00 0.760
2009- 5-24 12.70 0.760
2009- 5-25 13.40 0.760
2009- 5-26 14.10 0.760
2009- 5-27 14.80 0.760
2009- 5-28 15.50 0.760
2009- 5-29 16.20 0.760
2009- 5-30 16.90 0.760
2009- 5-31 17.60 0.760

Clear Skies, Petr [2009-05-07 08:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by Kamil from here, by Franck and his students from Lick, by Don from Carbuncle, by Yura and Vasilij from Kharkiv, and by Michal and Marek from S. Pleso. Current solution:
P_orb = 24.7 h
P_1 = 8.221 +/- 0.002 h (unique for assumed bimodal lightcurve shape)
A_1 = 0.08 mag
D_2/D_1 >= 0.57
http://www.asu.cas.cz/~asteroid/06708_porb.png
http://www.asu.cas.cz/~asteroid/06708_p1.png

The size ratio is unusually large (for asynchronous binary). The relatively long P_1 is, on the other hand, not an anomaly; it appears to be so just because a significant amount of primary's angular momentum was transferred to the relative orbital motion of the system's components. The total amount of angular momentum in the system is close to critical in the sense we published in Pravec and Harris (2007).

We are going to write a discovery announcement.

Cheers, Petr [2009-05-04 13:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:35 UT in good conditions. At 20:10 object changed to 3868 Mendoza. Michal [2009-05-03 20:13, SkalnatePleso] [Remove]
Message sent to observers

· I will start this one from 19:45 UT for ~6 hours long run covering the 0.75-phase event. Best wishes, Kamil [2009-05-02 19:32, Ondrejov]

· I will try to catch the 0.75-phase event if S. Pleso is not sure about good weather for observing of whole event. Best wishes, Kamil [2009-05-01 18:29, Ondrejov] Message sent to observers

· Observing from 18:52 UT in good conditions. Michal [2009-04-28 18:52, SkalnatePleso] [Remove]

· Started a run at 02:00 UT.
Don [2009-04-28 03:51, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This one has been observed by Don from Carbuncle (6 nights), by Kamil and Peter from here (2), by Vasilij Chiorny from Kharkiv (2), by Jozef and Stefan from Modra (1), and by Michal and Marek from S. Pleso (1):
P_orb = 24.8 h
P_1 = 4.11 h (U=2)
D_2/D_1 = 0.4 or greater
A_1 = 0.06 mag
http://www.asu.cas.cz/~asteroid/06708_porb.png
http://www.asu.cas.cz/~asteroid/06708_p1.png

Before we announce it on CBET, we need to cover the 0.75-phase event to establish D_2/D_1. The events are moving into the nightly window for our stations in the Central Europe during these nights (and it is already well inside the nightly window for Kharkiv), so it is likely that we will have it done in a few days. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 4-28 7.30 0.255
2009- 4-29 8.10 0.255
2009- 4-30 8.90 0.255
2009- 5- 1 9.70 0.255
2009- 5- 2 10.50 0.255
2009- 5- 3 11.30 0.255
2009- 5- 4 12.10 0.255
2009- 5- 5 12.90 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2009- 4-27 18.89 0.755
2009- 4-28 19.69 0.755
2009- 4-29 20.49 0.755
2009- 4-30 21.29 0.755
2009- 5- 1 22.09 0.755
2009- 5- 2 22.89 0.755
2009- 5- 3 23.69 0.755
2009- 5- 5 0.49 0.755

Re. establishing P_1: I am not sure whether we will be able to establish the (somewhat longish) P_1 uniquely for its low amplitude, but taking more data also outside events could be useful as well.

Clear Skies, Petr [2009-04-27 11:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:05 UT in good conditions. Michal [2009-04-25 19:05, SkalnatePleso] [Remove]
Message sent to observers

· Started a run at 01:30 UT.
Don [2009-04-25 01:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing it from 19:57 UT.

Jozef/Stefan [2009-04-24 20:05, Modra]

· Started a run at 01:45 UT.
Don [2009-04-24 02:02, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Unfortunately, my session was shortened by guiding problem of telescope :-( Peter K. [2009-04-22 00:38, Ondrejov] Message sent to observers

· Observing from 19:40 UT. This will be my primary target tonight. Peter K. [2009-04-21 19:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Three nights by Don and two nights by Kamil and Peter showed a low amplitude of 0.07 mag with a short period most time, but there are two groups of points lower by ~0.3 mag, see
http://www.asu.cas.cz/~asteroid/06708.png
They may be mutual events in a binary system, more good long data are needed to nail down the primary period and to capture more events to establish the binarity and estimate P_orb.

Clear Skies, Petr [2009-04-21 11:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one tonight. Best wishes, Kamil [2009-04-20 20:13, Ondrejov] Message sent to observers

· Observing this one tonight. Best wishes, Kamil [2009-04-19 21:29, Ondrejov]

· Started at 02:40 UT.
Don [2009-04-16 02:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Unexpected clouds shut down all runs.
Don [2009-04-14 03:56, CarbuncleHill]

· Started this new target at 02:35 UT.
Don [2009-04-14 02:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(11901) 1991 PV1 (Finished) [Add new note]
· This new target was done by Julian Oey from Leura and by Marek Husarik et al. from Skalnate Pleso: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/11901.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-07-10 10:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Target done: http://www.asu.cas.cz/~asteroid/11901.png
Peter K. [2013-07-03 16:41, Ondrejov] Message sent to observers

· continue observations on 14,15,16,17,19/06 and 07/02 to complete the light curve. the period is 9.3759h amplitude 0.6m [2013-07-03 04:41, Blue Mountains Obs]

· observed for nearly 4 hours started from 13.27 UT 06/13. [2013-06-14 00:50, Blue Mountains Obs] Message sent to observers

· observed from 11:40 to 17:16UT 06/07. Preliminary result found the period is 7.5h. [2013-06-07 21:51, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5431) Maxinehelin (Finished) [Add new note]
· This new target was done by Peter Kusnirak and Jan Vrastil from here: Unique period, sufficient coverage, no deviation,
http://www.asu.cas.cz/~asteroid/05431.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-07-10 09:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· This target was observed on 4 nights here and is finished now: http://www.asu.cas.cz/~asteroid/05431.png

Peter K. [2013-07-09 09:42, Ondrejov]

(5040) Rabinowitz (Finished) [Add new note]
· This new target was done by Kamil Hornoch and Peter Kusnirak from here and by Stefan Gajdos from Modra on five nights total: Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/05040.png
Finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, folks.

Cheers, Petr [2013-07-10 09:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· This target is done: http://www.asu.cas.cz/~asteroid/05040.png
Peter K. [2013-07-04 11:01, Ondrejov] Message sent to observers

· Observed last night from ~22:30 UT as completion and extension of observation at Ondrejov, due to expecting a local weather worsening.
Stefan [2013-07-03 13:41, Modra]

· Plan to observe this one all the night. Best wishes, Kamil [2013-07-02 19:51, Ondrejov] Message sent to observers

· Observed for 4.7 h last night. Period of 4.68 h should be unique after next night but we still need to improve coverage of the curve. Peter K. [2013-07-02 05:48, Ondrejov]

· Started this new target at 20:45 UT. Best wishes, Kamil [2013-06-28 20:48, Ondrejov] Message sent to BinAstPhotSurvey conference

(5905) Johnson (Finished) - Returning binary [Add new note]
· Done for the 4th apparition. Petr [2013-05-26 08:12, Ondrejov]

· I started a run at 01:40 UT. Last night was ruined by fog.
Don [2013-05-17 01:19, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 02:05 UT. Fog possible later.
Don [2013-05-16 01:45, Sugarloaf]

· I started a run on this at 01:20 UT.
Don [2013-05-15 01:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:00 UT.
Don [2013-05-13 00:42, Sugarloaf]

· I started a run at 01:20 UT.
Don [2013-05-07 01:08, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I started a run at 01:40 UT to get the most recent version of the primary LC.
Don [2013-05-04 01:22, Sugarloaf]

· Don Pray has taken one and half night for this one from Sugarloaf Mountain. The data from this appairition so far:
http://www.asu.cas.cz/~asteroid/05905_13b_porb.png
http://www.asu.cas.cz/~asteroid/05905_13b_p1.png
http://www.asu.cas.cz/~asteroid/05905_13a_porb.png
http://www.asu.cas.cz/~asteroid/05905_13a_p1.png

Taking more data for both events, and also outside events for definition of the primary lightcurve component, in May would be useful for further refining of the binary model; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4-29 0.13 0.248
2013- 4-29 21.91 0.248
2013- 4-30 19.69 0.248
2013- 5- 1 17.47 0.248
2013- 5- 2 15.25 0.248
2013- 5- 3 13.03 0.248
2013- 5- 4 10.81 0.248
2013- 5- 5 8.59 0.248
2013- 5- 6 6.37 0.248
2013- 5- 7 4.15 0.248
2013- 5- 8 1.93 0.248
2013- 5- 8 23.71 0.248
2013- 5- 9 21.49 0.248
2013- 5-10 19.27 0.248
2013- 5-11 17.05 0.248
2013- 5-12 14.83 0.248
2013- 5-13 12.61 0.248
2013- 5-14 10.39 0.248
2013- 5-15 8.17 0.248
2013- 5-16 5.95 0.248
2013- 5-17 3.73 0.248
2013- 5-18 1.51 0.248
2013- 5-18 23.29 0.248
2013- 5-19 21.07 0.248
2013- 5-20 18.85 0.248
2013- 5-21 16.63 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4-29 11.01 0.748
2013- 4-30 8.79 0.748
2013- 5- 1 6.57 0.748
2013- 5- 2 4.35 0.748
2013- 5- 3 2.13 0.748
2013- 5- 3 23.91 0.748
2013- 5- 4 21.69 0.748
2013- 5- 5 19.47 0.748
2013- 5- 6 17.25 0.748
2013- 5- 7 15.03 0.748
2013- 5- 8 12.81 0.748
2013- 5- 9 10.59 0.748
2013- 5-10 8.37 0.748
2013- 5-11 6.15 0.748
2013- 5-12 3.93 0.748
2013- 5-13 1.71 0.748
2013- 5-13 23.49 0.748
2013- 5-14 21.27 0.748
2013- 5-15 19.05 0.748
2013- 5-16 16.83 0.748
2013- 5-17 14.61 0.748
2013- 5-18 12.39 0.748
2013- 5-19 10.17 0.748
2013- 5-20 7.95 0.748
2013- 5-21 5.73 0.748
2013- 5-22 3.51 0.748

Clear Skies, Petr [2013-04-24 13:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run at 01:05 UT to capture the 0.75 phase event.
Don [2013-04-22 01:15, Sugarloaf]

· I started a run at 00:30 UT to capture the 0.25 phase event.
Don [2013-04-18 04:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observations by Don Pray from Sugarloaf Mountain and by Kamil Hornoch from here covered the 0.25-phase event a few times from March 17 to April 8:
http://www.asu.cas.cz/~asteroid/05905_13_porb.png
http://www.asu.cas.cz/~asteroid/05905_13_p1.png

More data for both events are needed to further refine the binary model; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4- 9 1.01 0.250
2013- 4- 9 22.79 0.250
2013- 4-10 20.57 0.250
2013- 4-11 18.35 0.250
2013- 4-12 16.13 0.250
2013- 4-13 13.91 0.250
2013- 4-14 11.69 0.250
2013- 4-15 9.47 0.250
2013- 4-16 7.25 0.250
2013- 4-17 5.03 0.250
2013- 4-18 2.81 0.250
2013- 4-19 0.59 0.250
2013- 4-19 22.37 0.250
2013- 4-20 20.15 0.250
2013- 4-21 17.93 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4- 9 11.89 0.750
2013- 4-10 9.67 0.750
2013- 4-11 7.45 0.750
2013- 4-12 5.23 0.750
2013- 4-13 3.01 0.750
2013- 4-14 0.79 0.750
2013- 4-14 22.57 0.750
2013- 4-15 20.35 0.750
2013- 4-16 18.13 0.750
2013- 4-17 15.91 0.750
2013- 4-18 13.69 0.750
2013- 4-19 11.47 0.750
2013- 4-20 9.25 0.750
2013- 4-21 7.03 0.750
2013- 4-22 4.81 0.750

Clear Skies, Petr [2013-04-08 14:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 20:15 UT and plan to get full-night run. Best wishes, Kamil [2013-04-07 20:33, Ondrejov] Message sent to observers

· Did a run on this last night (April 7) in good to fair conditions.
Don [2013-04-07 20:12, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start this at 03:30 UT.
Don [2013-03-18 01:31, Sugarloaf]

· Did a run on this last night in average conditions, (Mar 17 UT).
Don [2013-03-17 19:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Great data were taken for this binary by David Higgins from Hunters Hill and Joe Pollock with Prompt in the 3rd apparition:
http://www.asu.cas.cz/~asteroid/05905_110826_0907_porb.png
http://www.asu.cas.cz/~asteroid/05905_110826_0907_p1.png
http://www.asu.cas.cz/~asteroid/05905_110918_1003_porb.png
http://www.asu.cas.cz/~asteroid/05905_110918_1003_p1.png
http://www.asu.cas.cz/~asteroid/05905_111016_1020_porb.png
http://www.asu.cas.cz/~asteroid/05905_111016_1020_p1.png
http://www.asu.cas.cz/~asteroid/05905_111027_1126_porb.png
http://www.asu.cas.cz/~asteroid/05905_111027_1126_p1.png
They will be very useful for nailing down the orbit model (the solution in our recent paper, Icarus, in press, http://dx.doi.org/10.1016/j.icarus.2011.11.026 has not been unique).

Closed for this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great work, David and Joe.

Cheers, Petr [2011-12-14 08:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began observing from Prompt at 0115 UT under good conditions. Hope to get phase 0.25 0412 UT event. Joe [2011-11-20 04:28, Dark Sky & PROMPT] Message sent to observers

· Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011-11- 9 6.89 0.250
2011-11-10 4.66 0.250
2011-11-11 2.44 0.250
2011-11-12 0.21 0.250
2011-11-12 21.99 0.250
2011-11-13 19.76 0.250
2011-11-14 17.54 0.250
2011-11-15 15.31 0.250
2011-11-16 13.09 0.250
2011-11-17 10.86 0.250
2011-11-18 8.64 0.250
2011-11-19 6.41 0.250
2011-11-20 4.19 0.250
2011-11-21 1.96 0.250
2011-11-21 23.74 0.250
2011-11-22 21.51 0.250
2011-11-23 19.29 0.250
2011-11-24 17.06 0.250
2011-11-25 14.84 0.250
2011-11-26 12.61 0.250
2011-11-27 10.39 0.250
2011-11-28 8.16 0.250
2011-11-29 5.94 0.250
2011-11-30 3.71 0.250
2011-12- 1 1.49 0.250
2011-12- 1 23.26 0.250
2011-12- 2 21.04 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011-11- 8 19.99 0.750
2011-11- 9 17.77 0.750
2011-11-10 15.54 0.750
2011-11-11 13.32 0.750
2011-11-12 11.09 0.750
2011-11-13 8.87 0.750
2011-11-14 6.64 0.750
2011-11-15 4.42 0.750
2011-11-16 2.19 0.750
2011-11-16 23.97 0.750
2011-11-17 21.74 0.750
2011-11-18 19.52 0.750
2011-11-19 17.29 0.750
2011-11-20 15.07 0.750
2011-11-21 12.84 0.750
2011-11-22 10.62 0.750
2011-11-23 8.39 0.750
2011-11-24 6.17 0.750
2011-11-25 3.94 0.750
2011-11-26 1.72 0.750
2011-11-26 23.49 0.750
2011-11-27 21.27 0.750
2011-11-28 19.04 0.750
2011-11-29 16.82 0.750
2011-11-30 14.59 0.750
2011-12- 1 12.37 0.750
2011-12- 2 10.14 0.750

Clear Skies, Petr [2011-11-08 10:11, Ondrejov]

· Observed from Prompt tonight starting 0010 UT. Covered 0.75 phase event at 0320 UT. Joe [2011-10-27 05:51, Dark Sky & PROMPT] Message sent to observers

· Observed from Prompt last night 0100-0700. Covered phase 0.25 event at 0332 UT. Will try same event again tonight at 0120 UT. Joe [2011-10-22 20:09, Dark Sky & PROMPT]

· Observed 2011 09 16 through 2011 10 19 in variable conditions. Data sent to Petr and Peter K. [2011-10-19 21:34, HuntersHill] Message sent to observers

· Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011-10- 9 10.62 0.250
2011-10-10 8.40 0.250
2011-10-11 6.18 0.250
2011-10-12 3.96 0.250
2011-10-13 1.74 0.250
2011-10-13 23.52 0.250
2011-10-14 21.30 0.250
2011-10-15 19.08 0.250
2011-10-16 16.86 0.250
2011-10-17 14.64 0.250
2011-10-18 12.42 0.250
2011-10-19 10.20 0.250
2011-10-20 7.98 0.250
2011-10-21 5.76 0.250
2011-10-22 3.54 0.250
2011-10-23 1.32 0.250
2011-10-23 23.10 0.250
2011-10-24 20.88 0.250
2011-10-25 18.66 0.250
2011-10-26 16.44 0.250
2011-10-27 14.22 0.250
2011-10-28 12.00 0.250
2011-10-29 9.78 0.250
2011-10-30 7.56 0.250
2011-10-31 5.34 0.250
2011-11- 1 3.12 0.250
2011-11- 2 0.90 0.250
2011-11- 2 22.68 0.250
2011-11- 3 20.46 0.250
2011-11- 4 18.24 0.250
2011-11- 5 16.02 0.250
2011-11- 6 13.80 0.250
2011-11- 7 11.58 0.250
2011-11- 8 9.36 0.250
2011-11- 9 7.14 0.250
2011-11-10 4.92 0.250
2011-11-11 2.70 0.250
2011-11-12 0.48 0.250
2011-11-12 22.26 0.250
2011-11-13 20.04 0.250
2011-11-14 17.82 0.250
2011-11-15 15.60 0.250
2011-11-16 13.38 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011-10- 9 21.51 0.750
2011-10-10 19.29 0.750
2011-10-11 17.07 0.750
2011-10-12 14.85 0.750
2011-10-13 12.63 0.750
2011-10-14 10.41 0.750
2011-10-15 8.19 0.750
2011-10-16 5.97 0.750
2011-10-17 3.75 0.750
2011-10-18 1.53 0.750
2011-10-18 23.31 0.750
2011-10-19 21.09 0.750
2011-10-20 18.87 0.750
2011-10-21 16.65 0.750
2011-10-22 14.43 0.750
2011-10-23 12.21 0.750
2011-10-24 9.99 0.750
2011-10-25 7.77 0.750
2011-10-26 5.55 0.750
2011-10-27 3.33 0.750
2011-10-28 1.11 0.750
2011-10-28 22.89 0.750
2011-10-29 20.67 0.750
2011-10-30 18.45 0.750
2011-10-31 16.23 0.750
2011-11- 1 14.01 0.750
2011-11- 2 11.79 0.750
2011-11- 3 9.57 0.750
2011-11- 4 7.35 0.750
2011-11- 5 5.13 0.750
2011-11- 6 2.91 0.750
2011-11- 7 0.69 0.750
2011-11- 7 22.47 0.750
2011-11- 8 20.25 0.750
2011-11- 9 18.03 0.750
2011-11-10 15.81 0.750
2011-11-11 13.59 0.750
2011-11-12 11.37 0.750
2011-11-13 9.15 0.750
2011-11-14 6.93 0.750
2011-11-15 4.71 0.750
2011-11-16 2.49 0.750

Clear Skies, Petr [2011-10-09 09:39, Ondrejov]

· Observed from Prompt 2350-0830 UT last night under good conditions. Covered 0.246 phase event at 0152 UT. Joe [2011-10-03 14:17, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt at 0005 UT under good conditions. Hope to get phase 0.760 event at 0647 UT. Joe [2011-09-26 01:01, Dark Sky & PROMPT]

· Began observing from Prompt at 0010 UT under good conditions. Hope to get 0430 UT event. Joe [2011-09-22 00:58, Dark Sky & PROMPT] Message sent to observers

· Began observing from Prompt at 0008 UT under good conditions. Hope to get 0643 UT event. Joe [2011-09-21 01:14, Dark Sky & PROMPT]

· Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 9-14 22.23 0.246
2011- 9-15 20.01 0.246
2011- 9-16 17.79 0.246
2011- 9-17 15.57 0.246
2011- 9-18 13.35 0.246
2011- 9-19 11.13 0.246
2011- 9-20 8.91 0.246
2011- 9-21 6.69 0.246
2011- 9-22 4.47 0.246
2011- 9-23 2.25 0.246
2011- 9-24 0.03 0.246
2011- 9-24 21.81 0.246
2011- 9-25 19.59 0.246
2011- 9-26 17.37 0.246
2011- 9-27 15.15 0.246
2011- 9-28 12.93 0.246
2011- 9-29 10.71 0.246
2011- 9-30 8.49 0.246
2011-10- 1 6.27 0.246
2011-10- 2 4.05 0.246
2011-10- 3 1.83 0.246
2011-10- 3 23.61 0.246
2011-10- 4 21.39 0.246
2011-10- 5 19.17 0.246
2011-10- 6 16.95 0.246
2011-10- 7 14.73 0.246
2011-10- 8 12.51 0.246

Date/Time UTC (LTc.) Phase
--------------------------
2011- 9-15 9.42 0.760
2011- 9-16 7.20 0.760
2011- 9-17 4.98 0.760
2011- 9-18 2.76 0.760
2011- 9-19 0.54 0.760
2011- 9-19 22.32 0.760
2011- 9-20 20.10 0.760
2011- 9-21 17.88 0.760
2011- 9-22 15.66 0.760
2011- 9-23 13.44 0.760
2011- 9-24 11.22 0.760
2011- 9-25 9.00 0.760
2011- 9-26 6.78 0.760
2011- 9-27 4.56 0.760
2011- 9-28 2.34 0.760
2011- 9-29 0.12 0.760
2011- 9-29 21.90 0.760
2011- 9-30 19.68 0.760
2011-10- 1 17.46 0.760
2011-10- 2 15.24 0.760
2011-10- 3 13.02 0.760
2011-10- 4 10.80 0.760
2011-10- 5 8.58 0.760
2011-10- 6 6.36 0.760
2011-10- 7 4.14 0.760
2011-10- 8 1.92 0.760
2011-10- 8 23.70 0.760

Clear Skies, Petr [2011-09-14 12:11, Ondrejov]

· Observed 20110902 in reasonable conditions. Have now covered both events at least once. [2011-09-06 00:13, HuntersHill] Message sent to observers

· Began run 0120 UT from Prompt. Sky conditions good. Joe [2011-09-03 03:26, Dark Sky & PROMPT]

· Observed 20110830 in reasonable conditions. Data reveals the second part of the event observed in the previous night so the event looks real. [2011-08-31 04:19, HuntersHill] Message sent to observers

· Began a run from Prompt at 0130 UT. Sky conditions good. Joe [2011-08-31 02:12, Dark Sky & PROMPT]

· Observed 20110826 and 28 in average conditions. Data reveals a period of 3.779h +/- 0.003h with an amplitude of 0.18mag +/- 0.02mag. Data revealed a huge deviation (dip of 0.2mag) in the last 1/3 of last nights session. The images were wind affected so I am taking the deviation with a grain of salt.... [2011-08-29 00:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Analyzis to be finished after receiving Prompt data from Franck. Petr [2008-09-01 13:41, Ondrejov]

· Joe Pollock observed Johnson intensively with the PROMPT telescopes. He sent me the list of his observations attached below.

He is planning to have the data processed in the next two weeks. If one or various events that they observed are particularly interesting we can prioritize them. Just let us know,

regards
F.

5905 Johnson - Prompt

JD Date Observed (UT) Event (UT)

54576 04/19-20 0540-1012
54578 04/21-22 0543-1016
54588 05/01-02 0535-1021
54590 05/03-04 0530-1022

54640 06/22-23 0335-0826 0737
54642 06/24-25 0114-0428 0311
54643 06/25-26 0028-0813 0058
54647 06/29-30 0010-0540 0259
54648 06/30-07/01 2354-0721 0047
54651 07/02-03 0141-0706 0715
54656 07/08-09 2306-0630 0450 [2008-07-11 22:07, Marchis] Message sent to observers

· Observed from ~23UT for cca 2 hrs last night. Jozef [2008-07-06 15:53, Modra]

· observed from 04:35 UT under very good conditions [2008-07-03 04:42, Via Capote] Message sent to BinAstPhotSurvey conference

· observed from 04:15 UT under good conditions [2008-07-02 03:18, Via Capote]

· started at 13:23 UT and finished at 16:58UT 2008-06-30. complete predicted event observed under good condition. Data sent in.
Julian [2008-07-01 00:31, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 10:43 UT to 15:49 UT 2008-06-28 interupted by passing clouds and also cut short at the end. Data is of reasonable quality.
also observed from 10:37UT to 13:17UT 2008-06-29 in good condition. Cut short by instrument issues. Will attempt a full run again tonight.Julian [2008-06-30 06:23, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I tried to observe this in previous two nights with interruptions due to background stars and some local clouds. Data obtained are of decresed quality, though during an attenuation. I could not give you a note about my plan earlier due to internet failure this week. The upcoming night is not a good choice for Modra - again due to bright background stars. Adrian [2008-06-29 15:22, Modra] Message sent to observers

· Started around 0530 (June 28) after clouds cleared late. Using only one scope tonight. [2008-06-28 07:15, PalmerDivide]

· Started about 0500 UT. Working with two telescopes to check if previous data are somehow faulty. Getting SNR > 50 on both telescopes. [2008-06-27 05:09, PalmerDivide] Message sent to observers

· We started this around 4:10 UT and should be able to run it the rest of the night clouds permitting.

John G [2008-06-23 04:25, Sonoita]

· The possible additional period has not been found in the Lick+SRO data. Investigation of the deviations seen in the previous data are in progress, but at the time being, we consider them spurious.

A solution with P_1 and P_orb:
http://www.asu.cas.cz/~asteroid/05905_all.png
http://www.asu.cas.cz/~asteroid/05905_porb.png
http://www.asu.cas.cz/~asteroid/05905_p1.png
It is entirely consistent with data from the discovery apparition of 2005.

In next lunation, the asteroid will be favorably placed. Monitoring of events (good long sessions) would be useful. Ephemeris for events:

Date/Time UTC (LTc.) Phase
--------------------------
2008- 6-22 9.83 0.255
2008- 6-23 7.62 0.255
2008- 6-24 5.40 0.255
2008- 6-25 3.19 0.255
2008- 6-26 0.97 0.255
2008- 6-26 22.76 0.255
2008- 6-27 20.54 0.255
2008- 6-28 18.33 0.255
2008- 6-29 16.11 0.255
2008- 6-30 13.90 0.255
2008- 7- 1 11.68 0.255
2008- 7- 2 9.47 0.255
2008- 7- 3 7.25 0.255
2008- 7- 4 5.04 0.255
2008- 7- 5 2.82 0.255
2008- 7- 6 0.61 0.255
2008- 7- 6 22.39 0.255
2008- 7- 7 20.18 0.255
2008- 7- 8 17.96 0.255
2008- 7- 9 15.75 0.255
2008- 7-10 13.53 0.255
2008- 7-11 11.32 0.255
2008- 7-12 9.10 0.255
2008- 7-13 6.89 0.255
2008- 7-14 4.67 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2008- 6-22 20.71 0.755
2008- 6-23 18.50 0.755
2008- 6-24 16.28 0.755
2008- 6-25 14.07 0.755
2008- 6-26 11.85 0.755
2008- 6-27 9.64 0.755
2008- 6-28 7.42 0.755
2008- 6-29 5.21 0.755
2008- 6-30 2.99 0.755
2008- 7- 1 0.78 0.755
2008- 7- 1 22.56 0.755
2008- 7- 2 20.35 0.755
2008- 7- 3 18.13 0.755
2008- 7- 4 15.92 0.755
2008- 7- 5 13.70 0.755
2008- 7- 6 11.49 0.755
2008- 7- 7 9.27 0.755
2008- 7- 8 7.06 0.755
2008- 7- 9 4.84 0.755
2008- 7-10 2.63 0.755
2008- 7-11 0.41 0.755
2008- 7-11 22.20 0.755
2008- 7-12 19.98 0.755
2008- 7-13 17.77 0.755
2008- 7-14 15.55 0.755

Clear Skies, Petr [2008-06-18 09:06, Ondrejov] Message sent to observers

· Two nights 2008 June 14.3 and 15.3 by Walt, John and Dirk from SRO and three good and one marginal night taken during 2008 May 11.4-15.4 by Franck Marchis et al. from Lick joined in. Walt, John and Dirk have covered one full event on June 14.3, and Franck et al. have got a partial coverage of the event on three nights May 13.4-15.4. Solution for P_2 is still weak, more full-night data with errors not greater than 0.02 mag will be needed in the next lunation.
http://www.asu.cas.cz/~asteroid/05905_08_p1.png
http://www.asu.cas.cz/~asteroid/05905_08_p2.png
http://www.asu.cas.cz/~asteroid/05905_08_p2_nsp.png
http://www.asu.cas.cz/~asteroid/05905_08_porb.png

Clear Skies, Petr [2008-06-16 16:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· We got 7 hours on this last night and should get another full night on it tonight as long as the clouds stay away. Started around 3:45 UT.

John G [2008-06-15 04:52, Sonoita]

· Two new nights June 12.3 and 13.3 by Brian joined in, both short periods are visible there (though a solution for P_2 is not unique yet), and the other event captured on both nights.
http://www.asu.cas.cz/~asteroid/05905_08_p1.png
http://www.asu.cas.cz/~asteroid/05905_08_p2.png
http://www.asu.cas.cz/~asteroid/05905_08_porb.png

More data are needed. Since Brian will be away until June 25, could someone take over? Good sessions with durations at least 4 hours and errors not greater than 0.02 mag are needed.

Clear Skies, Petr [2008-06-13 11:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· If clear (predicted such), I'll work this starting about 0330 UT, June 13.

I will be shutdown from June 14-25 UT, so it would help if someone could pick this up, especially given Petr's finding of an apparent third period beyond P_1 and P_Orb found in 2005. Despite the moon, it's still been SNR ~90; that may change as the moon gets closer, of course. It's in a crowded area of the sky but, so far, it's managed to thread the needle and avoid most field stars. [2008-06-12 14:35, PalmerDivide] Message sent to observers

· Starting this about 0400 UT (June 12). [2008-06-12 03:57, PalmerDivide]

· Brian's data for 5905 Johnson (7 long sessions taken during May 30 and June 11) have shown the primary period as well as one well captured event (plus partial coverage of the event on other nights). The data, however, didn't fit well with the model, they showed an additional systematic variation, so I searched for another period. There indeed appears to be another period, though it is not a unique solution from the available data; in the second plot below, I show the shorterst one of a few possible values for the new period, which are in a range 4-7 hours. More data are needed to establish it.
http://www.asu.cas.cz/~asteroid/05905_08_p1.png
http://www.asu.cas.cz/~asteroid/05905_08_p2.png
http://www.asu.cas.cz/~asteroid/05905_08_p2_nsp.png
http://www.asu.cas.cz/~asteroid/05905_08_porb.png

For comparison, here are plots with a solution from the 2005 data (discovery apparition):
http://www.asu.cas.cz/~asteroid/05905_05_p1.png
http://www.asu.cas.cz/~asteroid/05905_05_porb.png
A search for another period in the 2005 data didn't show any.

Clear Skies, Petr [2008-06-11 16:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Johnson is one of our Spitzer Cycle-4 target. We have observations recorded from April 22 to May 15 (7 epochs with a duration of ~5h) and processed. A period of ~2 or 4h with Dm~0.1 is confirmed based on our data. We may have caught 2 mutual events (Dm~0.2). We will gladly merge these data with your survey if you want (Petr: let me know).
cordially,
Franck M. [2008-06-10 22:52, Marchis] Message sent to BinAstPhotSurvey conference

· Started this about 0330 UT (June 10). [2008-06-10 04:05, PalmerDivide] Message sent to observers

· Started tjis about 0330 UT (June 9). [2008-06-09 03:32, PalmerDivide]

· Started this about 0330 UT (June 8). [2008-06-08 08:51, PalmerDivide]

· Starting this about 0330 UT (June 7) [2008-06-07 02:47, PalmerDivide] Message sent to observers

· Started this about 0400 UT (June 6). It looks like it might avoid many field stars. [2008-06-06 05:22, PalmerDivide]

· Worked this for a fourth night. In crowded fields. Period with most recent data near 3.72 h, which is similar to one found before. [2008-06-04 08:06, PalmerDivide] Message sent to BinAstPhotSurvey conference

(7888) 1993 UC (Finished) - NEA binary [Add new note]
· Campaign is over. Petr [2013-05-21 08:12, Ondrejov]

· Observed last night from 20:00 till 00:40 UT under moderate conditions.
Stefan [2013-04-23 16:16, Modra]

· Observed (7888) from Kharkiv this night 18:20-01:40UT. Yura and Vasilij Ch. [2013-04-10 02:48, Kharkiv] Message sent to BinAstPhotSurvey conference

· Yura Krugly asks following:

"In end of March during full-moon's period we observed NEA 7888 1993 UC at Kharkiv, Abasumani and Nauchny. We have confirmed your old value of rot. period for 7888 which is 2.340h and small amplitude 0.09 mag variation. Also the asteroid show an unusual rotation. LCs show a long period variation with most possible value 32h (or with two near other values) with amplitude about 0.11 mag.

We will continue these observations, and invite to join us other observers in the binast-cooperation. It needs in more than 3 hours long LCs (if possible all night) with a good accuracy 0.01-0.03 mag, and for the best they should be calibrated."

We may guess that the second lightcurve component could be rotational lightcurve of a secondary (in a non-eclipsing system geometry). I encourage observers in the northern hemisphere to help Yura to confirm it. Also, the system may enter eclipse geometry at some point, so monitoring it (especially around minima of the long-period component, if the secondary's rotation is synchronous) through May could be good.

Clear Skies, Petr [2013-04-09 12:18, Ondrejov] Message sent to BinAstPhotSurvey conference

(242643) 2005 NZ6 (Finished) [Add new note]
· Closed. Petr [2013-05-21 08:08, Ondrejov]

· Observed for 3 hours last night (by J. Vrastil). Peter K. [2013-05-09 15:18, Ondrejov] Message sent to BinAstPhotSurvey conference

(6265) 1985 TW3 (Finished) - return binary [Add new note]
· Third apparition completed, we are going to look how it improves the model we published in Pravec et al. (2012). Petr [2013-05-21 08:05, Ondrejov]

· observed tonight from 1142-1633 UT 05/14 to capture the 0.735 phase. Good condition. Also data obtained on 05/11 from 1022-1639UT. [2013-05-14 23:16, Blue Mountains Obs] Message sent to observers

· Observed 0420-0800 UT from Prompt last night under good conditions to cover 0.735 phase event centered at 0536 UT. Joe [2013-05-11 14:06, Dark Sky & PROMPT]

· observed 05/01 from 12UT. 0.25 phase captured fully at 16 UT. excellent condition. [2013-05-01 20:41, Blue Mountains Obs] Message sent to observers

· First four nights by Joe Pollock with Prompt and by Julian Oey with Leura for this return binary in its current 3rd apparition:
http://www.asu.cas.cz/~asteroid/06265_13_porb.png
http://www.asu.cas.cz/~asteroid/06265_13_p1.png

More data in the next lunation will be needed; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4-29 0.52 0.256
2013- 4-29 16.38 0.256
2013- 4-30 8.24 0.256
2013- 5- 1 0.10 0.256
2013- 5- 1 15.96 0.256
2013- 5- 2 7.82 0.256
2013- 5- 2 23.68 0.256
2013- 5- 3 15.54 0.256
2013- 5- 4 7.40 0.256
2013- 5- 4 23.26 0.256
2013- 5- 5 15.12 0.256
2013- 5- 6 6.98 0.256
2013- 5- 6 22.84 0.256
2013- 5- 7 14.70 0.256
2013- 5- 8 6.56 0.256
2013- 5- 8 22.42 0.256
2013- 5- 9 14.28 0.256
2013- 5-10 6.14 0.256
2013- 5-10 22.00 0.256
2013- 5-11 13.86 0.256
2013- 5-12 5.72 0.256
2013- 5-12 21.58 0.256
2013- 5-13 13.44 0.256
2013- 5-14 5.30 0.256
2013- 5-14 21.16 0.256
2013- 5-15 13.02 0.256
2013- 5-16 4.88 0.256
2013- 5-16 20.74 0.256
2013- 5-17 12.60 0.256
2013- 5-18 4.46 0.256
2013- 5-18 20.32 0.256
2013- 5-19 12.18 0.256
2013- 5-20 4.04 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4-28 16.26 0.735
2013- 4-29 8.12 0.735
2013- 4-29 23.98 0.735
2013- 4-30 15.84 0.735
2013- 5- 1 7.70 0.735
2013- 5- 1 23.56 0.735
2013- 5- 2 15.42 0.735
2013- 5- 3 7.28 0.735
2013- 5- 3 23.14 0.735
2013- 5- 4 15.00 0.735
2013- 5- 5 6.86 0.735
2013- 5- 5 22.72 0.735
2013- 5- 6 14.58 0.735
2013- 5- 7 6.44 0.735
2013- 5- 7 22.30 0.735
2013- 5- 8 14.16 0.735
2013- 5- 9 6.02 0.735
2013- 5- 9 21.88 0.735
2013- 5-10 13.74 0.735
2013- 5-11 5.60 0.735
2013- 5-11 21.46 0.735
2013- 5-12 13.32 0.735
2013- 5-13 5.18 0.735
2013- 5-13 21.04 0.735
2013- 5-14 12.90 0.735
2013- 5-15 4.76 0.735
2013- 5-15 20.62 0.735
2013- 5-16 12.48 0.735
2013- 5-17 4.34 0.735
2013- 5-17 20.20 0.735
2013- 5-18 12.06 0.735
2013- 5-19 3.92 0.735
2013- 5-19 19.78 0.735

Clear Skies, Petr [2013-04-25 07:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· First data for the current 3rd apparition of the binary by Joe Pollock with Prompt and by Julian Oey from Leura:
http://www.asu.cas.cz/~asteroid/06265_13_porb.png
http://www.asu.cas.cz/~asteroid/06265_13_p1.png

More data are needed for both events; their ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4-17 18.93 0.258
2013- 4-18 10.79 0.258
2013- 4-19 2.65 0.258
2013- 4-19 18.51 0.258
2013- 4-20 10.37 0.258
2013- 4-21 2.23 0.258
2013- 4-21 18.09 0.258
2013- 4-22 9.95 0.258

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4-17 10.99 0.758
2013- 4-18 2.85 0.758
2013- 4-18 18.71 0.758
2013- 4-19 10.57 0.758
2013- 4-20 2.43 0.758
2013- 4-20 18.29 0.758
2013- 4-21 10.15 0.758
2013- 4-22 2.01 0.758

Clear Skies, Petr [2013-04-17 06:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Have recently taken three 9 hours runs from Prompt on 4/11-12, 4/12-13 and 4/13-14 under excellent conditions. Joe [2013-04-15 00:31, Dark Sky & PROMPT] Message sent to observers

· Done 2 nights of observations under excellent condition on 04/13 and 04/14 both for 3.5 hours. [2013-04-14 21:28, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Good data, consistent with the discovery apparition's results, except depth of the events that was deeper in this 2nd apparition, suggesting a greater size ratio. More high-quality observations in future apparition will be needed to nail down.
http://www.asu.cas.cz/~asteroid/06265_10_p1.png
http://www.asu.cas.cz/~asteroid/06265_10_porb.png

Nice work, David.

Cheers, Petr [2010-08-22 09:58, Ondrejov]

· Observing this target tonight (1 July). Finally have a mobile device (iPad) that can access the web and a static IP address from my ISP so now I can access and control my observatory from anywhere where I have access to a 3G data service or WiFi. [2010-07-01 13:17, HuntersHill] Message sent to observers

· Observed 2010 06 13 in reasonable conditions. Many data points removed due to background stars but data appears to reveal valid deviation. [2010-06-13 23:11, HuntersHill] Message sent to BinAstPhotSurvey conference

· Follow-up observations for this binary have been closed. Petr [2007-09-17 13:02, Ondrejov]

· Observed 2007-09-12 from 08:43UT to 15:37UT in reasonable conditions - night started windy. 3 data points were removed due to bright star subtraction near the start of the session.
Data sent to Petr. [2007-09-12 23:16, HuntersHill] Message sent to BinAstPhotSurvey conference

· David,

Your data of Sept. 9 fit reasonably with the primary period, but a gap there around orbital phase 0.78 in following plot
http://www.astro.cz/~asteroid/06265_longpc_b.png
doesn't allow us to see whether there are still shallow events or if they have already disappeared completely.

Clear Skies, Petr [2007-09-10 09:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-09 from 08:32UT to 15:53UT in good conditions until what appears to have been a single cloud cause the observing run to terminate. Data sent to Petr. [2007-09-09 22:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-03 from 08:36UT to 10:05UT until cloud ended the session. It is possible that I caught a partial event so I have kept the data and sent it on to Petr. [2007-09-03 22:07, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-02 from 08:36UT to 16:09UT in reasonable conditions. Data from 13:37 to end of session were directly affected by bright star subtractions. Some obviously erroneous results have been removed from the data. [2007-09-02 22:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-01 from 08:29UT to 16:32UT in good conditions. No major star subtractions in this session. Data sent to Petr for analysis. [2007-09-02 02:58, HuntersHill]

· Observed 2007-08-30 from 0840UT to 16:13UT in average conditions. A series of star subtractions required covering the period 0938-1140UT have have had some impact on the data. Data appears to show at least one of the events was covered. [2007-08-31 01:10, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-20 from 08:23UT to 17:19UT in reasonable conditions. Some issues with equipment and several star subtractions but the data appears to fit well. [2007-08-20 21:34, HuntersHill]

· Observed 2007-08-08 from 09:11UT to 18:07UT in very windy conditions. Conditions forced me to image at BIN 2x2 resulting is noisier than usual data but I believe I captured and covered one of the events well.

Data sent to Petr and Peter [2007-08-08 22:49, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-07 from 08:40UT to 12:22UT in variable conditions cut short by cloud. Looks like I caught part of an event toward the end but sparse data due to conditions.

Period refined to 2.70913 +/- 0.00007hrs [2007-08-08 02:03, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-06 from 10:00UT to 17:09UT in good conditions ending in heavy fog. A couple of major star subtractions and resultant loss of data. Should have caught part of an event but data was sparse at that point. [2007-08-06 23:44, HuntersHill] Message sent to BinAstPhotSurvey conference

· I'm copying the text of the CBET also here to the binast-webtool so that it is logged into the system.

Cheers, Petr

(6265) 1985 TW3
D. Higgins, Canberra, Australia; and P. Pravec and P. Kusnirak, Ondrejov
Observatory, report that photometric observations obtained during July 15-25
reveal that minor planet (6265) is a binary system with an orbital period of
15.86 ± 0.01 hr. The primary shows a period of 2.7091 ± 0.0001 hr, and
it has a lightcurve amplitude of 0.28 mag. Mutual eclipse/occultation events
that are 0.06- to 0.12-mag deep indicate a lower limit on the secondary-to-p
rimary mean-diameter ratio of 0.24 ± 0.02.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2007 CBAT
2007 August 2 (CBET 1015) Daniel W. E. Green [2007-08-02 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· From a correspondence with David Higgins, this one has been added as a target of the BinAstPhotSurvey before its binary character has been recognized. Therefore, it is being added as a regular binary detection within the Survey.

The detection is nice and unique:
P_1 = 2.7091 +/-0.0001 h
P_orb = 15.86 +/-0.01 h
A_1 = 0.28 mag
depth of events: 0.06-0.12 mag
D_2/D_1 = 0.24 +/-0.02
http://www.asu.cas.cz/~asteroid/06265_all.png
http://www.asu.cas.cz/~asteroid/06265_longpc.png
http://www.asu.cas.cz/~asteroid/06265_shortpc.png

David, you can draft out an announcement for CBET right away.

Cheers, Petr [2007-07-30 08:42, Ondrejov] Message sent to BinAstPhotSurvey conference

(4034) Vishnu (Finished) - NEO Source Target [Add new note]
· Done. Petr [2013-05-21 07:45, Ondrejov]

· Observing this one from 19:50 UT. Best wishes, Kamil [2013-05-15 21:45, Ondrejov] Message sent to observers

· Observing from 20 UT tonight. Peter [2013-05-14 23:49, Ondrejov]

· Observed last night in awful seeing. Best wishes, Kamil [2013-05-13 10:11, Ondrejov]

· Observed for 3 hours last night (by J. Vrastil). Peter K. [2013-05-09 15:17, Ondrejov] Message sent to observers

· I plan to start this at 05:00 UT.
Don [2013-04-15 01:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

(34706) 2001 OP83 (Finished) - return binary, 2nd apparition [Add new note]
· Observed from 0550-0850 UT from Prompt last night under good conditions to cover 0.747 phase event centered at 0652 UT. Joe [2013-05-05 14:08, Dark Sky & PROMPT] Message sent to observers

· observed 04/18 capturing half of the 0.25 phase event. [2013-04-20 08:46, Blue Mountains Obs]

· Starting a run at 05:30 UT to capture most of the 0.747 phase event.
Don [2013-04-18 04:01, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observed from Prompt last night. Covered phase 0.25 event at 0243 UT. Joe [2013-04-16 22:15, Dark Sky & PROMPT] Message sent to observers

· Joe Pollock took two nights for this retutn binary in its current return apparition (the first since the discovery in 2005):
http://www.asu.cas.cz/~asteroid/34706_13_porb.png
http://www.asu.cas.cz/~asteroid/34706_13_p1.png

More data are needed, especially for the 0.25-phase event; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4- 8 7.84 0.250
2013- 4- 9 4.60 0.250
2013- 4-10 1.36 0.250
2013- 4-10 22.12 0.250
2013- 4-11 18.88 0.250
2013- 4-12 15.64 0.250
2013- 4-13 12.40 0.250
2013- 4-14 9.16 0.250
2013- 4-15 5.92 0.250
2013- 4-16 2.68 0.250
2013- 4-16 23.44 0.250
2013- 4-17 20.20 0.250
2013- 4-18 16.96 0.250
2013- 4-19 13.72 0.250
2013- 4-20 10.48 0.250
2013- 4-21 7.24 0.250
2013- 4-22 4.00 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2013- 4- 7 21.38 0.747
2013- 4- 8 18.14 0.747
2013- 4- 9 14.90 0.747
2013- 4-10 11.66 0.747
2013- 4-11 8.42 0.747
2013- 4-12 5.18 0.747
2013- 4-13 1.94 0.747
2013- 4-13 22.70 0.747
2013- 4-14 19.46 0.747
2013- 4-15 16.22 0.747
2013- 4-16 12.98 0.747
2013- 4-17 9.74 0.747
2013- 4-18 6.50 0.747
2013- 4-19 3.26 0.747
2013- 4-20 0.02 0.747
2013- 4-20 20.78 0.747
2013- 4-21 17.54 0.747

Clear Skies, Petr [2013-04-07 13:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· We (Brian and I) have agreed that we are not going to pursue follow up observations for this one as it is in fairly crowded fields and its Abs(B_gal) is further decreasing, so that obtaining data of sufficient quality would require a much more effort than in other cases (giving that we have not well established image subtraction procedures yet). We are closing the campaign for this one now.

Cheers, Petr [2006-01-17 18:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm putting here the discovery announcement for this one, to have it here in one place. A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr

(34706) 2001 OP_83
B. D. Warner, Palmer Divide Observatory, Colorado Springs;
D. Pray, Greene, RI; P. Pravec, Ondrejov Observatory; and W.
Cooney, Jr., J. Gross, and D. Terrell, Sonoita Research Observatory,
Sonoita, AZ, report that photometric observations obtained during
Dec. 11-28 reveal that (34706) is a binary system with an orbital
period of 20.76 ± 0.01 hr. The primary rotates with a period of
2.5946 ± 0.0001 hr, and its lightcurve amplitude of 0.13 mag
indicates a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.08-0.17 mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.28 ± 0.02.

(C) Copyright 2005 CBAT
2005 December 29 (CBET 341) Daniel W. E. Green [2006-01-02 13:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· We are also on it at SRO. Our weather looks OK.

-Walt [2005-12-28 01:41, Sonoita]

· Started about 01:00 UT, Dec. 28. Passing clouds may put an early end to things. [2005-12-28 01:32, PalmerDivide] Message sent to BinAstPhotSurvey conference

· I started with it on Dec.25, 21:32UT, planned for full run up to Dec.26, 02:30UT. But some field stars could infere.

Stefan [2005-12-25 23:42, Modra]

· Brian's data of 2005-12-24.2 and 25.2 joined in. They nailed down the secondary event and orbital phases around it. The estimated parameters:
Pprim = 2.5946 +/-0.0001 h
Porb = 20.76 +/-0.01 h
Ds/Dp = 0.28 +/-0.02
Aprim = 0.13 mag
Depths of the events: 0.08-0.17 mag.
See pictures:
http://www.asu.cas.cz/~ppravec/34706_all.png
http://www.asu.cas.cz/~ppravec/34706_longpc.png
http://www.asu.cas.cz/~ppravec/34706_shortpc.png

It would be useful to cover the primary event and orbital phases around it once again to complete the coverage there, but we may draft out a discovery circular soon.

Cheers, Petr [2005-12-25 20:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting around 00:45-01:00 UT, Dec. 25.

Merry Christmas! [2005-12-25 02:40, PalmerDivide]

· I'll be trying to start around 00:45-01:00 UT, Dec. 24. The winds are a bit brisk, so I may get shut out in the end. [2005-12-24 02:37, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Brian's data of 2005-12-22.2 joined in, they covered the last big gap so they contribute significantly to the solution of the secondary's rotational component. Most of the primary event was missed, so the event needs to be covered once again (use the ephemeris below to plan your observations) to nail down its shape. Pictures showing the current solution:
http://www.asu.cas.cz/~ppravec/34706_all.png
http://www.asu.cas.cz/~ppravec/34706_longpc.png
http://www.asu.cas.cz/~ppravec/34706_shortpc.png

Cheers, Petr [2005-12-22 19:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this one about 00:45 UT, Dec. 22. [2005-12-22 01:46, PalmerDivide]

· Just a quick comment to clarify one thing that might confuse you when you stumble upon it: They were actually two messages from me, and the most recent pictures given at the URLs below have orbital phases given with respect to a different Epoch (shifted by about Porb/2) than the ephemerides for the events given further below. In other words, you can use the ephemerides given below, they are valid, but just remember that the phases given there in the third column don't correspond to the newer pictures.

Cheers, Petr [2005-12-21 22:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Initial observations by Don Pray and myself and subsequent analysis by Petr show this to be a binary. The primary period is 2.5944h and the Porb is 20.76h, give or take.

Here's is Petr's latest message

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

The current solution see:

http://www.asu.cas.cz/~ppravec/34706_all.png
http://www.asu.cas.cz/~ppravec/34706_longpc.png
http://www.asu.cas.cz/~ppravec/34706_shortpc.png

The last night's event is deeper than the event caught
on the few past nights, so it looks to be a primary
event while the one caught on the previous nights seems
to be secondary, but it needs to be confirmed with
further observations covering both events once again.

A preliminary estimate for Ds/Dp is 0.29.

Here are predicted mid-times for both events
(for the second event, a symmetry is assumed):

Date/Time UTC (LTc.) Phase
--------------------------
2005-12-21 16.80 0.260
2005-12-22 13.56 0.260
2005-12-23 10.32 0.260
2005-12-24 7.08 0.260
2005-12-25 3.84 0.260
2005-12-26 0.60 0.260
2005-12-26 21.36 0.260
2005-12-27 18.12 0.260
2005-12-28 14.88 0.260
2005-12-29 11.64 0.260
2005-12-30 8.40 0.260
2005-12-31 5.16 0.260

2005-12-22 3.19 0.760
2005-12-22 23.95 0.760
2005-12-23 20.71 0.760
2005-12-24 17.47 0.760
2005-12-25 14.23 0.760
2005-12-26 10.99 0.760
2005-12-27 7.75 0.760
2005-12-28 4.51 0.760
2005-12-29 1.27 0.760
2005-12-29 22.03 0.760
2005-12-30 18.79 0.760
2005-12-31 15.55 0.760
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Additional observations with high precision and extended
coverage are needed.

Please send me a copy of the data as well as to Petr.
Thanks.

Brian D. Warner
Palmer Divide Observatory
brian@MinorPlanetObserver.com [2005-12-21 21:29, PalmerDivide] Message sent to BinAstPhotSurvey conference

(2897) OleRomer (Finished) - return paired asteroid [Add new note]
· Don Pray took last data for this paired asteroid in its current 3rd apparition. After a 4th apparition, we'll solve for its pole and shape.
http://www.asu.cas.cz/~asteroid/002897_1305.png
http://www.asu.cas.cz/~asteroid/002897_1304.png
http://www.asu.cas.cz/~asteroid/002897_1303.png
http://www.asu.cas.cz/~asteroid/002897_1302.png

Cheers, Petr [2013-05-05 13:33, Ondrejov]

· Started a run on this at 01:00 UT.
Don [2013-05-05 00:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Julian Oey took very good data (covered twice its rotation) for this return paired asteroid:
http://www.asu.cas.cz/~asteroid/002897_1304.png
Cf. with data by Kamil Hornoch, Jan Vrastil and Don Pray from March and February:
http://www.asu.cas.cz/~asteroid/002897_1303.png
http://www.asu.cas.cz/~asteroid/002897_1302.png

This is sufficient data for this lunation. Taking one more lightcurve in May will be good.

Cheers, Petr [2013-04-16 10:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it now and planning to work on it for 6 hours tonight. [2013-04-14 11:49, Blue Mountains Obs] Message sent to observers

· This return paired asteroid, targeted for spin estimation, was done by Kamil Hornoch and Jan Vrastil from here over the weekend:
http://www.asu.cas.cz/~asteroid/002897_1303.png
Cf. with the data by Don Pray from February:
http://www.asu.cas.cz/~asteroid/002897_1302.png

This is sufficient data for this lunation. Taking another lightcurve in April will be good.

Cheers, Petr [2013-03-04 09:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray took high quality data for this return paired asteroid:
http://www.asu.cas.cz/~asteroid/002897_1302.png
(Yes, many of the numerous small local extrema in the fit appear consistently over the 2-3 periods covered by Don, so the fit up to the 14th order is justified, though not perfect in all parts of the curve.)

This is sufficient data for this lunation. Taking another lightcurve in March will be good.

Cheers, Petr [2013-02-08 07:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this last night under fair conditions.
Don [2013-01-23 15:46, Sugarloaf]

· This paired asteroid was observed by Kamil here on two nights and by Marek, Gabo and Michal from Sklanate Pleso on four nights. A good solution:
http://www.asu.cas.cz/~asteroid/002897_b1.png
It confirms the U = 2- solution we got from the 2010 observations by Julian from Leura, see
http://www.asu.cas.cz/~asteroid/002897.png

This one (with Delta H ~ 3.5) is consistent with the theory we presented in Pravec et al. (Nature 466, 1085-1088, 2010).

Target closed for the Survey,
http://www.asu.cas.cz/~ppravec/newres.htm

Cheers, Petr [2011-09-05 09:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· This night observed this object. Gabo [2011-09-03 17:41, SkalnatePleso] [Remove]
Message sent to observers

· From midnight UT I observed this object. Gabo [2011-09-02 22:41, SkalnatePleso] [Remove]

· Observed from 22UT upto 1:20UT on 29/30.08 at Abastumani.

Yura [2011-08-30 16:34, Kharkiv] Message sent to observers

· Observing from 20:40 UT in relatively good conditions. Michal [2011-08-29 20:49, SkalnatePleso] [Remove]

· Observed last night. But short duration due to two background stars and more and more clouds. Only 1 hr data could be taken.
Marek and Gabo [2011-08-26 11:42, SkalnatePleso] [Remove]
Message sent to observers

· Observing this one from 23:30 UT. Best wishes, Kamil [2011-08-24 00:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· This is a U = 2- solution, we will need to nail it down in future,
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2010-06-24 12:03, Ondrejov]

· observed from 8 UT 06/14 in good condition but only for half of night interupted by fog. [2010-06-15 07:22, Blue Mountains Obs] Message sent to observers

· observed from 7:52 UT 06/10. Not a complete nightly session but good data. [2010-06-11 14:06, Blue Mountains Obs]

· observed from 09:03 to 15:51UT 06/08 in variable condition. [2010-06-09 02:45, Blue Mountains Obs] Message sent to observers

· observed from 09:27 to 16:40 UT 06/04 in good condition. [2010-06-06 01:17, Blue Mountains Obs]

· Observations done on 05/06,05/07 and 05/08. Period is deterimined to be 2.605h. Will continue observations and data sent in. [2010-05-09 10:19, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5202) 1983 XX (Finished) - slow rotator [Add new note]
· This new target was done by Adrian Galad and Leos Kornos from Modra on 12 nights, supported by us from Ondrejov on 3 nights: long period, marginal suspect for tumbling,
http://www.asu.cas.cz/~asteroid/05202.png

Closed for the binary survey.

Petr [2013-02-21 07:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Once more an attempt to link and add some short sessions, but still not resolved solution unambiguously. P may be 37.86 h as well as 185 h... Adrian [2012-08-18 19:18, Modra]

· several short linked sessions of lower quality. leos [2012-08-10 12:33, Modra]

· Observed 3./4. Aug. I plan to do it also this night. Leos [2012-08-04 14:56, Modra]

· Observed in night 23/24 July. I plan to observe it this night 25/26.7. Leos [2012-07-25 21:21, Modra] Message sent to BinAstPhotSurvey conference

(1979) Sakharov (Finished) - paired asteroid [Add new note]
· Welcome back, Julian. Your revamped system works pretty well!

Your two nights Feb. 7-8 are sufficient for (1979) in its current apparition.
http://www.asu.cas.cz/~asteroid/001979_b3.png
It is a NEOSource project target within our task 3, Spin vectors of asteroid pairs; we plan to take more data during September-October 2015, then we'll attempt to get a pole solution.

Cheers, Petr [2013-02-10 15:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· observation done on 02/08 (11:15 to 17:56 UT). Good condition. [2013-02-09 11:34, Blue Mountains Obs] Message sent to observers

· Started on the asteroid pair. 2 nights of 02/06 (11:20 to 15:12UT) and 02/07 (11:20 to 17:53UT). [2013-02-08 03:14, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This binary suspect remains unconfirmed; a few deviations seen but no consistent solution.
http://www.asu.cas.cz/~ppravec/newres.htm
http://www.asu.cas.cz/~asteroid/001979.png

Good efforts on this difficult case, guys!

Petr [2011-10-14 08:58, Ondrejov] Message sent to observers

· I will be observing this one tonight 18:20-23:45 UT. Best wishes, Kamil [2011-09-24 16:31, Ondrejov]

· Planning this tonight, starting ~18:30 UT. Jozef, Stefan. [2011-09-23 17:55, Modra]

· We plan to start with this object in a few minutes. Jozef/Stefan [2011-09-22 18:14, Modra] Message sent to observers

· 3 more nights 09/19,09/20,09/21 started from about 10 UT. [2011-09-21 21:24, Blue Mountains Obs]

· Planning to observe this from ~18:30 UT. Jozef [2011-09-21 18:21, Modra] Message sent to observers

· Observing this target from 18:30 U.T. Vasilij Ch. [2011-09-19 22:56, Kharkiv]

· I obtained 2 more short nights for 09/15 and 09/16 [2011-09-17 08:12, Blue Mountains Obs] Message sent to observers

· I plan this target tonight, although according to the weather forecast some thin clouds could interfere. Adrian [2011-09-15 19:18, Modra] Message sent to BinAstPhotSurvey conference

· Started in a good conditions at 18:20UT, both asteroids in the field. Yura [2011-09-07 04:51, Kharkiv] Message sent to observers

· There is another bright asteroid near 1979 within these days. It's (32953) 1996 GF19. If you are able to measure it with accuracy better than 0.02 mag, please send your data too. It meats Survey's criteria and data from 4 sessions (Ondrejov+Modra) show lightcurve with possible period ~10 hours but very small amplitude ~0.04 mag. Peter K. [2011-09-06 13:51, Ondrejov] Message sent to observers

· obtained data on 09/06 for 6h at about 10UT. [2011-09-06 10:45, Blue Mountains Obs]

· Assuming it stays clear, I'll start this around 0300 UT (Sep 6).

Brian [2011-09-06 00:38, PalmerDivide] Message sent to observers

· Started about 03:00 UT. A little breezy but should be able to get good enough data.

Brian [2011-09-05 03:39, PalmerDivide]

· Began run at Prompt 2330 UT under good conditions. Joe [2011-09-04 23:32, Dark Sky & PROMPT] Message sent to observers

· Hopefully I could continue with this tonight, if thin clouds will cover Ondrejov sooner than they cover Modra. Adrian [2011-09-04 19:07, Modra]

· Kamil took a good 6.2-h session here on the past night, see it folded with the other data with the tentative orbit period:
http://www.asu.cas.cz/~asteroid/001979_porb.png

More data!

Clear Skies, Petr [2011-09-04 06:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· We will be observing this one as main target tonight (19:40-01:45) + two complementary targets (22166) and (19763). Best wishes, Kamil + student [2011-09-03 15:34, Ondrejov] Message sent to observers

· For this primary of the pair 1979-13732, we have got 11 sessions so far, albeit mostly short. Analysing data taken from here, Modra, Kharkiv and Carbuncle Hill, we have found a likely period of 7.519 h (U = 2+ currently), but the last eight points of the Don's session of 2011-08-24.2 were lower and we were not able to reconcile this disrecpancy with any different period, see
http://www.asu.cas.cz/~asteroid/001979_110803_0903.png
And an attempt to join in the three short sessions taken by Yura Krugly and O.Burkhonov from Maidanak on 2011-07-23.9 to 25.9 failed completely, see
http://www.asu.cas.cz/~asteroid/001979_p1.png
The four misfit sessions may be mutual events in a binary system. A tentative solution:
http://www.asu.cas.cz/~asteroid/001979_porb.png
There, the somewhat imperfect fit of the 07-23.9 and 25.9 session around phase 0.25 may be either due to a more complex orbital lightcurve or due to an imperfect subtraction of a lightcurve of the primary that was poorly defined from the short July data.

We need to confirm this suspect binary and establish the orbital period. Being a member of asteroid pair, it is an extremely interesting object. Observations from a few stations spread around the globe will be probably needed. I ask you to help out us.

Clear Skies, Petr and Peter [2011-09-03 10:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:20 UT (planned 5736 is passing in front of stars tonight). Peter K. [2011-09-01 20:29, Ondrejov] Message sent to observers

· Observing this one from 19:30 U.T. Vasilij Ch. [2011-08-29 23:08, Kharkiv]

· Began observing from Prompt at 0040 UT. Will run until about 1000 UT. Joe [2011-08-29 03:21, Dark Sky & PROMPT] Message sent to observers

· Observed at Abastumani during last night (17:30-1:06 UT), and tonight started on 17:10 UT.
Yura [2011-08-28 18:27, Kharkiv]

· Observed from Prompt last night after clouds cleared from 0630-0920 UT. Joe [2011-08-28 15:17, Dark Sky & PROMPT] Message sent to observers

· Don Pray has taken initial data for this paired asteroid:
http://www.asu.cas.cz/~asteroid/001979.png
He may not be able to take more data as he will move in a week or so and there is also a hurricane approaching his site. (Hold strong, Don!) I encourage someone else here to take over this target.

Clear Skies, Petr [2011-08-26 07:02, Ondrejov] Message sent to BinAstPhotSurvey conference

(2855) Bastian (Finished) [Add new note]
· This new target was done by Joe Pollock with Prompt and the DSO 32" and by Kamil Hornoch and Peter Kusnirak from here: Unique solution, one small deviation seen, but considered marginal.
http://www.asu.cas.cz/~asteroid/02855.png

Target done,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-01-24 12:33, Ondrejov] Message sent to BinAstPhotSurvey conference

(7695) Premysl (Finished) [Add new note]
· Don Pray observed this new target from Sugarloaf Mountain on four nights: P = 11.734 h, U = 2+
http://www.asu.cas.cz/~asteroid/07695.png

Target done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2013-01-24 12:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 23:00 Dec 11 UT.
Don [2012-12-12 01:10, Sugarloaf]

· Started a run at 23:25, Dec 6, UT.
Don [2012-12-06 23:26, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 23:40, Dec 3 UT. This is the second run on this. It's in a dense star field, but moving briskly.
Don [2012-12-04 00:35, Sugarloaf]

(9260) Edwardolson (Finished) - return binary, 2nd apparition [Add new note]
· Done for the 2nd apparition. Petr [2012-12-21 11:05, Ondrejov]

· Observed last night at Prompt from 0040-0540 UT. Just started run for tonight. Joe [2012-12-07 00:37, Dark Sky & PROMPT] Message sent to observers

· Plan to observe from Prompt beginning about 0010 UT. Secondary event centered at 0107 UT. Joe [2012-11-04 21:46, Dark Sky & PROMPT]

· Data available for this one in its current 2nd (1st return) apparition so far, taken by Joe Pollock from DSO, by Don Pray from Sugarloaf Mountain and by Marek Husarik from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/09260_12_porb.png
http://www.asu.cas.cz/~asteroid/09260_12_p1.png

More data for both events are needed; ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 10.94 0.254
2012-11- 3 4.73 0.254
2012-11- 3 22.51 0.254
2012-11- 4 16.30 0.254
2012-11- 5 10.08 0.254
2012-11- 6 3.87 0.254
2012-11- 6 21.65 0.254
2012-11- 7 15.44 0.254
2012-11- 8 9.22 0.254
2012-11- 9 3.01 0.254
2012-11- 9 20.79 0.254
2012-11-10 14.58 0.254
2012-11-11 8.36 0.254
2012-11-12 2.15 0.254
2012-11-12 19.93 0.254
2012-11-13 13.72 0.254
2012-11-14 7.50 0.254
2012-11-15 1.29 0.254
2012-11-15 19.07 0.254
2012-11-16 12.86 0.254
2012-11-17 6.64 0.254
2012-11-18 0.43 0.254
2012-11-18 18.21 0.254
2012-11-19 12.00 0.254
2012-11-20 5.78 0.254
2012-11-20 23.57 0.254
2012-11-21 17.35 0.254
2012-11-22 11.14 0.254
2012-11-23 4.92 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 1.97 0.750
2012-11- 2 19.76 0.750
2012-11- 3 13.54 0.750
2012-11- 4 7.33 0.750
2012-11- 5 1.11 0.750
2012-11- 5 18.90 0.750
2012-11- 6 12.68 0.750
2012-11- 7 6.47 0.750
2012-11- 8 0.25 0.750
2012-11- 8 18.04 0.750
2012-11- 9 11.82 0.750
2012-11-10 5.61 0.750
2012-11-10 23.39 0.750
2012-11-11 17.18 0.750
2012-11-12 10.96 0.750
2012-11-13 4.75 0.750
2012-11-13 22.53 0.750
2012-11-14 16.32 0.750
2012-11-15 10.10 0.750
2012-11-16 3.89 0.750
2012-11-16 21.67 0.750
2012-11-17 15.46 0.750
2012-11-18 9.24 0.750
2012-11-19 3.03 0.750
2012-11-19 20.81 0.750
2012-11-20 14.60 0.750
2012-11-21 8.38 0.750
2012-11-22 2.17 0.750
2012-11-22 19.95 0.750

Clear Skies, Petr [2012-10-29 10:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:30 UT in a good conditions. Michal [2012-10-22 18:40, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 17:15 UT, but due to technical problems with telescope motions, satisfactory data from 19:00 UT only. Michal [2012-10-21 19:58, SkalnatePleso] [Remove]

· This return binary has been worked in its current 2nd apparition by Joe Pollock from DSO, by Don Pray from Sugarloaf Mountain and by Marek Husarik from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/09260_12_porb.png
http://www.asu.cas.cz/~asteroid/09260_12_p1.png

More data for both events are needed; ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-10-21 14.38 0.254
2012-10-22 8.17 0.254
2012-10-23 1.95 0.254
2012-10-23 19.74 0.254
2012-10-24 13.52 0.254
2012-10-25 7.31 0.254
2012-10-26 1.09 0.254
2012-10-26 18.88 0.254

Date/Time UTC (LTc.) Phase
--------------------------
2012-10-21 23.20 0.750
2012-10-22 16.98 0.750
2012-10-23 10.77 0.750
2012-10-24 4.55 0.750
2012-10-24 22.34 0.750
2012-10-25 16.12 0.750
2012-10-26 9.91 0.750

Clear Skies, Petr [2012-10-21 08:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began run from Dark Sky under good conditions at ~0200 UT. Hope to observe to about 1000 UT. Joe [2012-10-12 06:19, Dark Sky & PROMPT] Message sent to observers

· Began from Dark Sky under good conditions at ~0300 UT. Hope to extend Marek's run to about 1000 UT. Joe [2012-10-11 03:36, Dark Sky & PROMPT]

· Starting this on at 23:30 UT to ~04 UT.
Marek [2012-10-10 23:29, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Additional data taken on 2005-10-30.1 by Gianluca Masi and Franco Malia at Campo Catino have a large scatter. Gianluca may be able to re-reduce them to a higher accuracy later on, but it has come a time to submit the discovery report to CBAT now, so I did it a few minutes ago. The submitted report see below.

Btw, Peter Kusnirak has calibrated the Ondrejov data, and I have estimated H_R=13.99 +/-0.13 assuming G=0.15 +/-0.2 for the asteroid. The MPC's H value of 14.7 is consistent with the estimated H_R value, considering the range V-R=0.45 +/-0.1 for most asteroids.

The asteroid will be already too faint for useful follow up observations with our telescopes in the next lunation, so the campaign on it is finished. Great work all!

Cheers, Petr Pravec

(9260) Edwardolson
M. Jakub\'{\i}k and M. Hus\'arik, Skalnat\'e Pleso Observatory;
J. Vil\'agi, \v{S}. Gajdo\v{s} and A. Gal\'ad, Modra Observatory;
P. Pravec and P. Ku\v{s}nir\'ak, Ond\v{r}ejov Observatory;
W. Cooney, J. Gross and D. Terrell, Sonoita Research Observatory, AZ;
D. Pray, Carbuncle Hill Observatory, RI; and R. Stephens, Yucca Valley,
CA, report that photometric observations obtained during
Oct. 6 to 30 show that the minor planet (9260) is a binary system with
an orbital period of 17.785 +/- 0.003 hr. The primary rotates with a
period of 3.0852 +/- 0.0001 hr, and its lightcurve amplitude of 0.11 mag
is indicative of a nearly spheroidal shape. Mutual eclipse/occultation
events that are 0.08-0.15 mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.27 +/- 0.03. [2005-11-02 12:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in
2005-10-30.3 by Bob Stephens at his new observatory named GMARS (see http://www.asu.cas.cz/~asteroid/observ.htm )
2005-10-30.9 by Stefan Gajdos and Jozo Vilagi at Modra.
They fit well in almost all parts (a small but potentially interesting evolution of the secondary event's shape on the last night will be checked from Modra on a following night). The current solution see
http://www.asu.cas.cz/~ppravec/9260_all.png
http://www.asu.cas.cz/~ppravec/9260_longpc.png
http://www.asu.cas.cz/~ppravec/9260_shortpc.png

So, we are ready to submit the report. Gianluca Masi, however, asked if we could wait until tomorrow for his additional data that they took with their refurbished 0.8m telescope at Campo Catino. He should have them reduced by tomorrow. He took them following our call for observations for the target, it will be quite fair to wait the one day for him. So, I will submit the discovery report tomorrow after receiving the additional data from Gianluca.

Cheers, Petr [2005-10-31 17:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by S. Gajdos and J. Vilagi from Modra obtained on 2005-10-29.9. The data improved coverage of a part of the primary event as well as some phases outside of it, nailing down the solution in those orbital phases well. The current solution see pictures
http://www.asu.cas.cz/~ppravec/9260_all.png
http://www.asu.cas.cz/~ppravec/9260_longpc.png
http://www.asu.cas.cz/~ppravec/9260_shortpc.png

After one more night (planned by Stefan and Jozo at Modra for tonight), this binary may be finished. I'll wait with submitting the discovery report for it.

Cheers, Petr [2005-10-30 17:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started another run at 17:50 UT, conditions r good. We expect coverage till 00:45 UT [2005-10-29 19:55, Modra]

· A few slightly revised datasets from SRO and Modra (basically after a more thorough checking for faint background stars) received, no major impact to the solution.

Of three new datasets received from Skalnate Pleso and Modra, two are too short and/or noisy so they don't contribute effectively to the solution. The third dataset from SP of 10-27.8 is useful, but since it virtually duplicates that from Modra of the same night, the coverage of this binary hasn't been improved since what I reported here yesterday.

The current solution see pictures
http://www.asu.cas.cz/~ppravec/9260_all.png
http://www.asu.cas.cz/~ppravec/9260_longpc.png
http://www.asu.cas.cz/~ppravec/9260_shortpc.png

A couple good nights (long, errors <0.02 mag) are still needed to nail down the solution fully.

Cheers, Petr [2005-10-29 15:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Here are clear skies. I suppose errors < .02 mag.
This run started at 23.45 UT.

-Marek [2005-10-28 23:52, Skalnate Pleso]

· New data joined in:
2005-10-26.3 and 27.3 by Walt, John and Dirk from SRO
2005-10-27.1 by Don from Carbuncle Hill
2005-10-27.9 by Stefan and Jozo from Modra
The solution has stabilized, unique periods are:
Pprim= 3.0852 h (error <0.0001 h)
Porb = 17.785 h (error <0.005 h)
Ds/Dp = 0.27 +/- 0.03
See pictures
http://www.asu.cas.cz/~ppravec/9260_all.png
http://www.asu.cas.cz/~ppravec/9260_longpc.png
http://www.asu.cas.cz/~ppravec/9260_shortpc.png

The coverage is not fully up to our standards yet, so
a couple more nights of good quality (errors <0.02 mag) are
needed. I will write a draft report to IAUC tomorrow evening (should be back from a short trip to my parents; today is the national holliday here).

Cheers, Petr [2005-10-28 09:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on Edwardolson at 18.00 UT. The sky is clear here but windy. Stars are slightly smudged. I do my best.
Marek [2005-10-27 19:36, Skalnate Pleso]

· We have started a third night on this one tonight at SRO.

-Walt [2005-10-27 03:12, Sonoita] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:40 UT.

Don [2005-10-27 00:51, CarbuncleHill]

· Started this one around 21:30 as the sky cleared up. Jozef [2005-10-26 21:47, Modra] Message sent to BinAstPhotSurvey conference

· Walt, John, Dirk,
Your data of 10-25.3 joined in, fit very well. Yes, you have caught almost a complete event at the end of the night. The current solution see
http://www.asu.cas.cz/~ppravec/9260_all.png
http://www.asu.cas.cz/~ppravec/9260_longpc.png
http://www.asu.cas.cz/~ppravec/9260_shortpc.png
where I have emphasized your data for now. The solution is stabilizing. The current estimated parameters:
Pprim= 3.0853 +/-0.0001 h
Porb = 17.784 h (error <0.005 h)
Ds/Dp = 0.25 +/- 0.04

Further observations of good quality (errors <0.02 mag) are needed to nail the solution down and to cover well the mutual events (as well as orbital phases outside of the events). Your second night should be very useful for it. It is a primary target also here at Ondrejov and Modra for nights of good sky. Other stations capable to work it are encouraged to observe it as well, of course.

When we nail it down and cover well, we will write a discovery report for IAUC.

Cheers, Petr [2005-10-26 16:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· We got a 7.3 hour light curve for 9260 at SRO last night. It looks very much like we got an attenuation at the end of the night. Will get a second night tonight. Petr, will send you the data in a little while.

-Walt [2005-10-25 23:33, Sonoita] Message sent to BinAstPhotSurvey conference

· Started all night run on 9260 Edwardolson. 5 minute unfiltered images. Run starting at 10-25 2:45 UT.

-Walt [2005-10-25 02:46, Sonoita]

· Peter K. detected here another event in this binary suspect in the last night. The current solution (still not much certain, particularly due to the incomplete coverage and long intervals between the nights) see
http://www.asu.cas.cz/~ppravec/9260.png
More data with errors <0.02 mag are needed to nail the solution down.

Cheers, Petr [2005-10-23 09:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started this one (18 UT) but awaiting clouds later tonight. Pauling is close to very bright star (~5 mag) and not observable. Peter [2005-10-22 18:19, Ondrejov]

· The three nights data:
2005-10-06.9 by Marian Jakubik and Marek Husarik from Skalnate Pleso
2005-10-10.9 and 12.9 by Jozo Vilagi from Modra
don't fit well with a single period. An analysis by Adrian and me suggests that it may be binary. A tentative solution is:
Pprim = 3.09 h, Aprim = 0.10 mag,
Porb on the order of 20 hours.
The depth of the apparent attenuations are 0.10-0.12 mag, suggesting Ds/Dp ~0.3. This solution based on the first three nights is still pretty weak, more data are needed to nail it down and to confirm the suspicion.

Cheers, Petr Pravec [2005-10-13 16:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one tonight from Modra. Jozef [2005-10-10 19:05, Modra]

· Hi Marek and Marian,
Adrian and I have looked at your data. They suggest a period in a range of hours, but not much more can be said from the first session. Another night or two (preferrably if consecutive) will be needed to get a solution for the object.

Clear Skies, Petr [2005-10-10 18:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations of (9260) Edwardolson were done by Marian Jakubik from Skalnate Pleso Obs. on October 6th.

PS. I'm with family and out of work :) But you can send notes. I'll be on-line few minutes per day.

Marek [2005-10-09 12:30, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

(1453) Fennia (Finished) - return binary [Add new note]
· Done for the 4th apparition. Petr [2012-12-21 10:34, Ondrejov]

· Last data on the events for the current apparition would be useful (errors <= 0.02 mag needed); events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-12- 2 0.44 0.250
2012-12- 2 23.44 0.250
2012-12- 3 22.44 0.250
2012-12- 4 21.44 0.250
2012-12- 5 20.44 0.250
2012-12- 6 19.44 0.250
2012-12- 7 18.44 0.250
2012-12- 8 17.44 0.250
2012-12- 9 16.44 0.250
2012-12-10 15.44 0.250
2012-12-11 14.44 0.250
2012-12-12 13.44 0.250
2012-12-13 12.44 0.250
2012-12-14 11.44 0.250
2012-12-15 10.44 0.250
2012-12-16 9.44 0.250
2012-12-17 8.44 0.250
2012-12-18 7.44 0.250
2012-12-19 6.44 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2012-12- 1 13.04 0.755
2012-12- 2 12.04 0.755
2012-12- 3 11.04 0.755
2012-12- 4 10.04 0.755
2012-12- 5 9.04 0.755
2012-12- 6 8.04 0.755
2012-12- 7 7.04 0.755
2012-12- 8 6.04 0.755
2012-12- 9 5.04 0.755
2012-12-10 4.04 0.755
2012-12-11 3.04 0.755
2012-12-12 2.04 0.755
2012-12-13 1.04 0.755
2012-12-14 0.04 0.755
2012-12-14 23.04 0.755
2012-12-15 22.04 0.755
2012-12-16 21.04 0.755
2012-12-17 20.04 0.755
2012-12-18 19.04 0.755

Clear Skies, Petr [2012-11-26 10:31, Ondrejov]

· Great data were obtained for this one by Don Pray from Sugarloaf Mountain, by Marek Husarik, Gabo Cervak a Zuzana Krisandova from Skalnate Pleso, by Peter Kusnirak from here, and by Stefan Gajdos and Adrian Galad from Modra in the past lunation:
http://www.asu.cas.cz/~asteroid/01453_12c_porb.png
http://www.asu.cas.cz/~asteroid/01453_12c_p1.png

More high-quality data with good coverage of both events (ideally covering each event twice during one lunation) will be good for refining the model; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 7.46 0.251
2012-11- 3 6.46 0.251
2012-11- 4 5.46 0.251
2012-11- 5 4.46 0.251
2012-11- 6 3.46 0.251
2012-11- 7 2.46 0.251
2012-11- 8 1.46 0.251
2012-11- 9 0.46 0.251
2012-11- 9 23.46 0.251
2012-11-10 22.46 0.251
2012-11-11 21.46 0.251
2012-11-12 20.46 0.251
2012-11-13 19.46 0.251
2012-11-14 18.46 0.251
2012-11-15 17.46 0.251
2012-11-16 16.46 0.251
2012-11-17 15.46 0.251
2012-11-18 14.46 0.251
2012-11-19 13.46 0.251
2012-11-20 12.46 0.251
2012-11-21 11.46 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2012-11- 2 19.01 0.754
2012-11- 3 18.01 0.754
2012-11- 4 17.01 0.754
2012-11- 5 16.01 0.754
2012-11- 6 15.01 0.754
2012-11- 7 14.01 0.754
2012-11- 8 13.01 0.754
2012-11- 9 12.01 0.754
2012-11-10 11.01 0.754
2012-11-11 10.01 0.754
2012-11-12 9.01 0.754
2012-11-13 8.01 0.754
2012-11-14 7.01 0.754
2012-11-15 6.01 0.754
2012-11-16 5.01 0.754
2012-11-17 4.01 0.754
2012-11-18 3.01 0.754
2012-11-19 2.01 0.754
2012-11-20 1.01 0.754
2012-11-21 0.01 0.754
2012-11-21 23.01 0.754

Clear Skies, Petr [2012-10-29 09:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 23:15 ,(2012-10-22)UT
Don [2012-10-23 00:58, Sugarloaf]

· Clouds are finally departing. Started the run at 03:50 UT.
Don [2012-10-22 03:51, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started at 23:55 UT.
Don [2012-10-21 00:05, Sugarloaf]

· Observing from 18 UT. Peter K. [2012-10-18 18:04, Ondrejov] Message sent to observers

· Observing from 20:40 UT. Peter K. [2012-10-13 23:19, Ondrejov]

· I started this at 01:05 UT, and should catch the 0.247 phase event.
Don [2012-10-13 01:20, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Clouds are over, so maybe I can continue with this. Adrian [2012-10-09 21:08, Modra]

· Trying it from 18:58 UT if weather holds.
Stefan [2012-10-08 19:31, Modra]

· This return binary was observed by Jozef Vilagi and Stefan Gajdos from Modra and by Don Pray from Sugarloaf Mountain in its current 4th apparition. The data obtained so far are in agreement with the published model:
http://www.asu.cas.cz/~asteroid/01453_12a_porb.png
http://www.asu.cas.cz/~asteroid/01453_12a_p1.png
http://www.asu.cas.cz/~asteroid/01453_12b_porb.png
http://www.asu.cas.cz/~asteroid/01453_12b_p1.png

More high-quality data with good coverage of both events (ideally covering each event twice during one lunation) will be good for refining the model; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 4 13.23 0.247
2012-10- 5 12.22 0.247
2012-10- 6 11.20 0.247
2012-10- 7 10.19 0.247
2012-10- 8 9.17 0.247
2012-10- 9 8.16 0.247
2012-10-10 7.14 0.247
2012-10-11 6.13 0.247
2012-10-12 5.11 0.247
2012-10-13 4.10 0.247
2012-10-14 3.08 0.247
2012-10-15 2.07 0.247
2012-10-16 1.05 0.247
2012-10-17 0.04 0.247
2012-10-17 23.02 0.247
2012-10-18 22.01 0.247
2012-10-19 20.99 0.247
2012-10-20 19.98 0.247
2012-10-21 18.96 0.247
2012-10-22 17.95 0.247
2012-10-23 16.93 0.247
2012-10-24 15.92 0.247
2012-10-25 14.90 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2012-10- 4 1.73 0.747
2012-10- 5 0.72 0.747
2012-10- 5 23.70 0.747
2012-10- 6 22.69 0.747
2012-10- 7 21.67 0.747
2012-10- 8 20.66 0.747
2012-10- 9 19.64 0.747
2012-10-10 18.63 0.747
2012-10-11 17.61 0.747
2012-10-12 16.60 0.747
2012-10-13 15.58 0.747
2012-10-14 14.57 0.747
2012-10-15 13.55 0.747
2012-10-16 12.54 0.747
2012-10-17 11.52 0.747
2012-10-18 10.51 0.747
2012-10-19 9.49 0.747
2012-10-20 8.48 0.747
2012-10-21 7.46 0.747
2012-10-22 6.45 0.747
2012-10-23 5.43 0.747
2012-10-24 4.42 0.747
2012-10-25 3.40 0.747

Clear Skies, Petr [2012-10-01 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning this one from ~19:15UT. Jozef [2012-09-28 18:53, Modra]

· Started at 02:10 UT.
Don [2012-09-25 02:12, Sugarloaf]

· Plan to start this at 02:15 UT.
Don [2012-09-24 01:34, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing it from 20:52 UT.
Stefan [2012-09-22 21:43, Modra]

· Started at 02:20 UT and hopefully will extend Modra's run.
Don [2012-09-22 02:27, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing it from 20:00 UT on Sep. 21, 2012, under soft cirrus.
Stefan [2012-09-21 20:15, Modra]

· Starting this at 02:30 UT, and should capture one of the events.
Don [2012-09-21 01:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Planning to start this at 03:20 UT.
Don [2012-09-13 02:28, Sugarloaf]

· Starting a run at 03:30 UT.
Don [2012-09-12 02:39, Sugarloaf]

· Late start (due to problem with CCD camera) on 23:10 UT, Sep. 9.
Stefan [2012-09-09 23:21, Modra] Message sent to observers

· Observing it from 22:19 UT on Sep. 8.
Jozef/Stefan [2012-09-08 23:51, Modra]

· First try on the target in recent apparition, started on 22:16 UT, Sep. 7.
Stefan/Jozef [2012-09-07 22:34, Modra] Message sent to BinAstPhotSurvey conference

· This 3rd apparition of the binary was finished with last four nights taken by Jozef, Leos and Stefan from Modra, Joe with Prompt, and Peter K. from here. The full coverage of this apparition is 91 days:
http://www.asu.cas.cz/~asteroid/01453_11e_porb.png
http://www.asu.cas.cz/~asteroid/01453_11d_porb.png
http://www.asu.cas.cz/~asteroid/01453_11c_porb.png
http://www.asu.cas.cz/~asteroid/01453_11b_porb.png
http://www.asu.cas.cz/~asteroid/01453_11a_porb.png
We are going to use the 3-app dataset of Fennia for our new paper on the anisotropic distribution of binary orbit poles that we work on now.

Great work all!

Cheers, Petr [2011-05-12 07:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:10 UT, moderate sky. Peter K. [2011-04-29 22:29, Ondrejov] Message sent to observers

· Began observing from Prompt at 2320 UT under good conditions. Hope to cover event at 0135 UT. Joe [2011-04-24 23:30, Dark Sky & PROMPT]

· Observing from 19:10UT. Jozef, Stefan. [2011-04-21 19:18, Modra]

· Observing from 19:34UT. Jozef, Leos. [2011-04-18 20:02, Modra]

· Observed in night 16/17 April 2011. Leos [2011-04-17 11:24, Modra] Message sent to observers

· In the past lunation from March 22 to April 11, which was the 3rd observed lunation for this binary in the current apparition, observations were taken by Kamil and Peter K. from here and by Jozef, Stefan and Leos from Modra:
http://www.asu.cas.cz/~asteroid/01453_11c_porb.png
http://www.asu.cas.cz/~asteroid/01453_11d_porb.png
To complete the great data set of this apparition, last observations for the mutual events as well outside them (to describe the changing primary lightcurve) in the upcoming, 4th lunation will be needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 4-22 4.63 0.260
2011- 4-23 3.61 0.260
2011- 4-24 2.60 0.260
2011- 4-25 1.58 0.260
2011- 4-26 0.57 0.260
2011- 4-26 23.55 0.260
2011- 4-27 22.54 0.260
2011- 4-28 21.52 0.260
2011- 4-29 20.51 0.260
2011- 4-30 19.49 0.260
2011- 5- 1 18.48 0.260
2011- 5- 2 17.46 0.260
2011- 5- 3 16.45 0.260
2011- 5- 4 15.43 0.260
2011- 5- 5 14.42 0.260
2011- 5- 6 13.40 0.260
2011- 5- 7 12.39 0.260
2011- 5- 8 11.37 0.260
2011- 5- 9 10.36 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2011- 4-21 17.37 0.770
2011- 4-22 16.36 0.770
2011- 4-23 15.34 0.770
2011- 4-24 14.33 0.770
2011- 4-25 13.31 0.770
2011- 4-26 12.30 0.770
2011- 4-27 11.28 0.770
2011- 4-28 10.27 0.770
2011- 4-29 9.25 0.770
2011- 4-30 8.24 0.770
2011- 5- 1 7.22 0.770
2011- 5- 2 6.21 0.770
2011- 5- 3 5.19 0.770
2011- 5- 4 4.18 0.770
2011- 5- 5 3.16 0.770
2011- 5- 6 2.15 0.770
2011- 5- 7 1.13 0.770
2011- 5- 8 0.12 0.770
2011- 5- 8 23.10 0.770

Clear Skies, Petr [2011-04-14 12:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this one at ~20 UT when clouds permit... Best wishes, Kamil [2011-04-11 19:06, Ondrejov] Message sent to observers

· Trying to observe, starting 19:00UT. Jozef, Stefan [2011-04-09 18:57, Modra]

· Planning this one starting 18:45UT. Jozef, Stefan [2011-04-08 18:41, Modra]

· Taking over from 22:05 UT in a similar conditions unfortunately. Michal [2011-04-05 22:07, SkalnatePleso] [Remove]
Message sent to observers

· Observing through cirrus from 19:45UT, it's possible we finish prematurely tonight, background star could be interfering as well... Jozef. [2011-04-05 20:01, Modra]

· Observing this one from 18:45 UT. Best wishes, Kamil [2011-03-24 18:53, Ondrejov] Message sent to observers

· Successfuly covered 0.750-phase event. Best wishes, Kamil [2011-03-22 03:53, Ondrejov]

· Observing this one from 23:15 UT, cirrus and moon interfering, but seems viable. Jozef, Leos. [2011-03-21 23:52, Modra]

· Great data for this return binary so far, guys:
http://www.asu.cas.cz/~asteroid/01453_11b_porb.png
http://www.asu.cas.cz/~asteroid/01453_11b_p1.png
http://www.asu.cas.cz/~asteroid/01453_11a_porb.png
http://www.asu.cas.cz/~asteroid/01453_11a_p1.png

We will start covering the 3rd lunation for it in this apparition, they will be great data for modeling. As I wrote here already several days ago, further monitoring of the events evolution will be useful to prolong the arc to refine the orbital period and to detect possible changes of the events shapes; the data show a decrease of the depth of the secondary event from 0.085 mag on Feb 8 to 0.070 mag on Feb 26 that suggests that the system was moving away from the central eclipse geometry. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3-23 11.87 0.250
2011- 3-24 10.86 0.250
2011- 3-25 9.84 0.250
2011- 3-26 8.83 0.250
2011- 3-27 7.81 0.250
2011- 3-28 6.80 0.250
2011- 3-29 5.78 0.250
2011- 3-30 4.77 0.250
2011- 3-31 3.75 0.250
2011- 4- 1 2.74 0.250
2011- 4- 2 1.72 0.250
2011- 4- 3 0.71 0.250
2011- 4- 3 23.69 0.250
2011- 4- 4 22.68 0.250
2011- 4- 5 21.66 0.250
2011- 4- 6 20.65 0.250
2011- 4- 7 19.63 0.250
2011- 4- 8 18.62 0.250
2011- 4- 9 17.60 0.250
2011- 4-10 16.59 0.250
2011- 4-11 15.57 0.250
2011- 4-12 14.56 0.250
2011- 4-13 13.54 0.250
2011- 4-14 12.53 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3-23 0.37 0.750
2011- 3-23 23.35 0.750
2011- 3-24 22.34 0.750
2011- 3-25 21.32 0.750
2011- 3-26 20.31 0.750
2011- 3-27 19.29 0.750
2011- 3-28 18.28 0.750
2011- 3-29 17.26 0.750
2011- 3-30 16.25 0.750
2011- 3-31 15.23 0.750
2011- 4- 1 14.22 0.750
2011- 4- 2 13.20 0.750
2011- 4- 3 12.19 0.750
2011- 4- 4 11.17 0.750
2011- 4- 5 10.16 0.750
2011- 4- 6 9.14 0.750
2011- 4- 7 8.13 0.750
2011- 4- 8 7.11 0.750
2011- 4- 9 6.10 0.750
2011- 4-10 5.08 0.750
2011- 4-11 4.07 0.750
2011- 4-12 3.05 0.750
2011- 4-13 2.04 0.750
2011- 4-14 1.02 0.750
2011- 4-15 0.01 0.750

Clear Skies, Petr [2011-03-18 13:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 19:44 UT on Mar.15, 2011.

Stefan [2011-03-15 20:09, Modra] Message sent to observers

· Starting this one from 23:10 UT. Jozef, Stefan. [2011-03-11 23:08, Modra]

· Working from SRO tonight. -Walt [2011-03-02 01:33, Sonoita]

· Great data for the secondary event by Jozef and Stefan from Modra and for the primary event by Kamil from here:
http://www.asu.cas.cz/~asteroid/01453_11b_porb.png
http://www.asu.cas.cz/~asteroid/01453_11b_p1.png
http://www.asu.cas.cz/~asteroid/01453_11a_porb.png
http://www.asu.cas.cz/~asteroid/01453_11a_p1.png
One more session for the primary event is needed to get a sufficient coverage for this lunation. Further monitoring of the events evolution in the next lunation will be useful to prolong the arc to refine the orbital period, and to detect possible changes of the events shapes; the current data show a decrease of the depth of the secondary event from 0.085 mag on Feb 8 to 0.070 mag on Feb 26 that suggests that the system is gradually moving away from the central eclipse geometry. Data on further evolution of the events will be good for precise modeling of the system.

Date/Time UTC (LTc.) Phase
--------------------------
2011- 3- 1 11.22 0.250
2011- 3- 2 10.20 0.250
2011- 3- 3 9.19 0.250
2011- 3- 4 8.17 0.250
2011- 3- 5 7.16 0.250
2011- 3- 6 6.14 0.250
2011- 3- 7 5.13 0.250
2011- 3- 8 4.11 0.250
2011- 3- 9 3.10 0.250
2011- 3-10 2.08 0.250
2011- 3-11 1.07 0.250
2011- 3-12 0.05 0.250
2011- 3-12 23.04 0.250
2011- 3-13 22.02 0.250
2011- 3-14 21.01 0.250
2011- 3-15 19.99 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2-28 23.71 0.750
2011- 3- 1 22.70 0.750
2011- 3- 2 21.68 0.750
2011- 3- 3 20.67 0.750
2011- 3- 4 19.65 0.750
2011- 3- 5 18.64 0.750
2011- 3- 6 17.62 0.750
2011- 3- 7 16.61 0.750
2011- 3- 8 15.59 0.750
2011- 3- 9 14.58 0.750
2011- 3-10 13.56 0.750
2011- 3-11 12.55 0.750
2011- 3-12 11.53 0.750
2011- 3-13 10.52 0.750
2011- 3-14 9.50 0.750
2011- 3-15 8.49 0.750

Clear Skies, Petr [2011-02-28 13:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:08 UT. Jozef, Stefan [2011-02-26 22:20, Modra]

· Observing tonight, starting ~21UT. Jozef, Stefan. [2011-02-25 21:13, Modra]

· Observing from ~1:36 UT. Jozef, Stefan. [2011-02-25 01:50, Modra]

· Planning to cover part of an event and the rotation, starting right away. Jozef, Leos. [2011-02-22 18:02, Modra]

· Observing this one from 18:10 UT - trying to cover whole 0.25-phase event. Best wishes, Kamil [2011-02-21 19:12, Ondrejov] Message sent to observers

· Two more nights, one by Russ and one by Peter K., they complete the coverage for this lunation,
http://www.asu.cas.cz/~asteroid/01453_11_porb.png
http://www.asu.cas.cz/~asteroid/01453_11_p1.png

Monitoring of events in the next lunation will be useful for future modeling. The previous two apparitions have got relatively short coverage, 28 days in 2007 and 13 days in 2009, and one apparition with a long coverage is needed to get a unique solution; the current apparition is promissing that it may become the long one. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2-21 19.56 0.247
2011- 2-22 18.55 0.247
2011- 2-23 17.54 0.247
2011- 2-24 16.53 0.247
2011- 2-25 15.52 0.247
2011- 2-26 14.51 0.247
2011- 2-27 13.50 0.247
2011- 2-28 12.49 0.247
2011- 3- 1 11.48 0.247
2011- 3- 2 10.47 0.247
2011- 3- 3 9.46 0.247
2011- 3- 4 8.45 0.247
2011- 3- 5 7.44 0.247
2011- 3- 6 6.43 0.247
2011- 3- 7 5.42 0.247
2011- 3- 8 4.41 0.247
2011- 3- 9 3.40 0.247
2011- 3-10 2.39 0.247
2011- 3-11 1.38 0.247
2011- 3-12 0.37 0.247
2011- 3-12 23.36 0.247
2011- 3-13 22.35 0.247
2011- 3-14 21.34 0.247
2011- 3-15 20.33 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2-21 7.94 0.742
2011- 2-22 6.93 0.742
2011- 2-23 5.92 0.742
2011- 2-24 4.91 0.742
2011- 2-25 3.90 0.742
2011- 2-26 2.89 0.742
2011- 2-27 1.88 0.742
2011- 2-28 0.87 0.742
2011- 2-28 23.86 0.742
2011- 3- 1 22.85 0.742
2011- 3- 2 21.84 0.742
2011- 3- 3 20.83 0.742
2011- 3- 4 19.82 0.742
2011- 3- 5 18.81 0.742
2011- 3- 6 17.80 0.742
2011- 3- 7 16.79 0.742
2011- 3- 8 15.78 0.742
2011- 3- 9 14.77 0.742
2011- 3-10 13.76 0.742
2011- 3-11 12.75 0.742
2011- 3-12 11.74 0.742
2011- 3-13 10.73 0.742
2011- 3-14 9.72 0.742
2011- 3-15 8.71 0.742

Clear Skies, Petr [2011-02-10 13:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will try to cover the 0.25 event tonight.

Russ [2011-02-10 02:15, Shed of Science] Message sent to observers

· Two new sessions added in: one by Peter K. covering the 0.75-phase event and one by Russ Durkee covering the 0.25-phase event:
http://www.asu.cas.cz/~asteroid/01453_11_porb.png
http://www.asu.cas.cz/~asteroid/01453_11_p1.png

One more coverage of the 0.25-phase event needed for this lunation. Event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2-10 7.63 0.245
2011- 2-11 6.62 0.245
2011- 2-12 5.61 0.245
2011- 2-13 4.60 0.245
2011- 2-14 3.59 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2- 9 20.12 0.745
2011- 2-10 19.11 0.745
2011- 2-11 18.10 0.745
2011- 2-12 17.09 0.745
2011- 2-13 16.08 0.745
2011- 2-14 15.07 0.745

Clear Skies, Petr [2011-02-09 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will try another night on this starting at about 4:30UT.

Russ [2011-02-09 01:23, Shed of Science] Message sent to observers

· I aborted my run due to background stars. Switching to (2754) Efimov. Peter K. [2011-02-08 20:53, Ondrejov]

· Taking another night with 0.75-phase event. Observing from 19:35 UT. Peter K. [2011-02-08 19:44, Ondrejov] Message sent to observers

· Observing from 19:40 UT. Peter K. [2011-02-07 19:43, Ondrejov]

· Peter K. has covered the 0.75-phase event on the last night. Current solution (with P_orb fixed at the value derived in previous apparition):
http://www.asu.cas.cz/~asteroid/01453_11_porb.png
http://www.asu.cas.cz/~asteroid/01453_11_p1.png

A few more nights with errors < 0.02 mag are needed to complete (double) coverage for both events, their ephemerides:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2- 8 9.65 0.245
2011- 2- 9 8.64 0.245
2011- 2-10 7.63 0.245
2011- 2-11 6.62 0.245
2011- 2-12 5.61 0.245
2011- 2-13 4.60 0.245
2011- 2-14 3.59 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2- 7 22.14 0.745
2011- 2- 8 21.13 0.745
2011- 2- 9 20.12 0.745
2011- 2-10 19.11 0.745
2011- 2-11 18.10 0.745
2011- 2-12 17.09 0.745
2011- 2-13 16.08 0.745
2011- 2-14 15.07 0.745

Clear Skies, Petr [2011-02-07 14:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:50 UT and should cover 0.75-phase event. Peter K. [2011-02-06 21:00, Ondrejov] Message sent to observers

· I will be starting this one at about 3:45UT and perhaps catch the end of the 0.75 phase event.

Russ [2011-02-03 03:28, Shed of Science]

· One long and one short session taken by Peter and Kamil from here:
http://www.asu.cas.cz/~asteroid/01453_11_porb.png
http://www.asu.cas.cz/~asteroid/01453_11_p1.png
The solution is with the periods are fixed at the estimated values from previous apparition.

A few more nights with errors < 0.02 mag are needed to complete (double) coverage for both events, their ephemerides:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 1-31 17.84 0.250
2011- 2- 1 16.83 0.250
2011- 2- 2 15.82 0.250
2011- 2- 3 14.81 0.250
2011- 2- 4 13.80 0.250
2011- 2- 5 12.79 0.250
2011- 2- 6 11.78 0.250
2011- 2- 7 10.77 0.250
2011- 2- 8 9.76 0.250
2011- 2- 9 8.75 0.250
2011- 2-10 7.74 0.250
2011- 2-11 6.73 0.250
2011- 2-12 5.72 0.250
2011- 2-13 4.71 0.250
2011- 2-14 3.70 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2- 1 5.33 0.750
2011- 2- 2 4.32 0.750
2011- 2- 3 3.31 0.750
2011- 2- 4 2.30 0.750
2011- 2- 5 1.29 0.750
2011- 2- 6 0.28 0.750
2011- 2- 6 23.27 0.750
2011- 2- 7 22.26 0.750
2011- 2- 8 21.25 0.750
2011- 2- 9 20.24 0.750
2011- 2-10 19.23 0.750
2011- 2-11 18.22 0.750
2011- 2-12 17.21 0.750
2011- 2-13 16.20 0.750
2011- 2-14 15.19 0.750

Clear Skies, Petr [2011-01-31 14:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this one for 2.3h after successful run of (2754) Efimov (event captured). Best wishes, Kamil [2011-01-31 09:55, Ondrejov] Message sent to observers

· Hello all,

my observation last night were succesfull. I got 8+ hours with one event partialy covered.

http://www.asu.cas.cz/~asteroid/01453_b1_porb.png
http://www.asu.cas.cz/~asteroid/01453_b1_p1.png

Now we need double coverage of both events (errors <= 0.01 mag) for further modeling of this binary system. Here is an ephemeris for next couple of days (using periods derived in 2009 apparition):

Date/Time UTC (LTc.) Phase
--------------------------
2011- 1-28 20.87 0.250
2011- 1-29 19.86 0.250
2011- 1-30 18.85 0.250
2011- 1-31 17.84 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 1-29 8.36 0.750
2011- 1-30 7.35 0.750
2011- 1-31 6.34 0.750
2011- 2- 1 5.33 0.750

Good luck!

Peter K. [2011-01-29 08:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:50 UT. Peter K. [2011-01-28 21:47, Ondrejov]

· David has done this one sufficiently for the current apparition. Except one night which is noisier and shows unexplained features, the data give estimated parameters in agreement with the estimates from the discovery apparition.
http://www.asu.cas.cz/~asteroid/01453_09_porb.png
http://www.asu.cas.cz/~asteroid/01453_09_p1.png

Very good work, David.

Cheers, Petr [2009-09-03 08:49, Ondrejov] Message sent to observers

· Observed 2009-08-17 from 08:56UT to 19:21UT in good conditions so got partial coverage of the 0.25 event. Only 2 usable comp stars but data seems reasonable. [2009-08-17 22:29, HuntersHill]

· Like for 6244, David's two nights for this one are in a great agreement with our data from the discovery apparition.
http://www.asu.cas.cz/~asteroid/01453_09_porb.png
http://www.asu.cas.cz/~asteroid/01453_09_p1.png
A coverage of the "opposite" event (around orbital phase 0.25, probably primary for this one) will be needed to complete this binary for the current apparition; events ephemerides:

Date/Time UTC (LTc.) Phase
--------------------------
2009- 8-17 19.88 0.253
2009- 8-18 18.87 0.253
2009- 8-19 17.86 0.253
2009- 8-20 16.85 0.253
2009- 8-21 15.84 0.253
2009- 8-22 14.83 0.253
2009- 8-23 13.82 0.253
2009- 8-24 12.81 0.253
2009- 8-25 11.80 0.253
2009- 8-26 10.79 0.253
2009- 8-27 9.78 0.253
2009- 8-28 8.77 0.253
2009- 8-29 7.76 0.253
2009- 8-30 6.75 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2009- 8-18 7.36 0.753
2009- 8-19 6.35 0.753
2009- 8-20 5.34 0.753
2009- 8-21 4.33 0.753
2009- 8-22 3.32 0.753
2009- 8-23 2.31 0.753
2009- 8-24 1.30 0.753
2009- 8-25 0.29 0.753
2009- 8-25 23.28 0.753
2009- 8-26 22.27 0.753
2009- 8-27 21.26 0.753
2009- 8-28 20.25 0.753
2009- 8-29 19.24 0.753
2009- 8-30 18.23 0.753

Clear Skies, Petr [2009-08-17 14:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009-08-15 from 09:40UT to 19:19UT in good conditions. Curve indicates considerable deviations. Data sent to Petr. [2009-08-16 21:43, HuntersHill] Message sent to observers

· Observed 2009-08-14 from 08:57UT to 18:18UT in fair conditions. Data indicates a period of 4.53 +/- 0.07hrs with an amplitude of 0.2 +/0 -.02 mag. The minima was covered twice but show differnt depths - no other deviations were noted. I could not see anything obvious in the data or images to account for this deviation. Data sent to Petr. [2009-08-15 01:40, HuntersHill] Message sent to BinAstPhotSurvey conference

(44612) 1999 RP27 (Finished) - paired asteroid [Add new note]
· Done for this apparition. Petr [2012-12-16 12:37, Ondrejov]

· This paired asteroid (the secondary to 2110 Moore-Sitterly) has been worked by Peter Kusnirak and Kamil Hornoch from here in its current 2nd apparition:
http://www.asu.cas.cz/~asteroid/044612_1208.png
http://www.asu.cas.cz/~asteroid/044612_1210.png
cf. with our data from the 1.54-m on La Silla and the 1-m on the Wise Observatory (published in Pravec et al. 2010):
http://www.asu.cas.cz/~asteroid/044612.png

This is sufficient data for it for this month. We plan to observe it with the 1.54-m telescope on La Silla on November 5 and December 10; it is a target in the task 3, Spin vectors of asteroid pairs, of our NEOSource project). See
http://www.asu.cas.cz/~asteroid/DK154_schedule.html

Cheers, Petr [2012-10-12 11:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:25 UT. Peter K. [2012-10-11 21:15, Ondrejov]

(54041) 2000 GQ113 (Finished) - paired asteroid [Add new note]
· Done for this apparition. Petr [2012-12-16 12:35, Ondrejov]

· Started this at 0:15 UT but low clouds are all around and may affect my observation later tonight. Peter K. [2012-11-21 00:28, Ondrejov] Message sent to observers

· I'll be starting this secondary target at 00:30 UT.
Don [2012-11-19 23:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I'll be doing a third night on this starting around 5:40 UT.
Don [2012-11-19 00:07, Sugarloaf]

· Plan to start this NEO Source target at 05:40 UT.
Don [2012-11-16 23:18, Sugarloaf] Message sent to BinAstPhotSurvey conference

(162004) 1991 VE (Finished) - small Aten, Yarkovsky-effect-detected object, complex lightcurve [Add new note]
· Done for now. Petr [2012-12-16 12:34, Ondrejov]

· This small Aten-type asteroid is a target in our NEOsource project, task 10) Spin rates and vectors of asteroids with detected Yarkovsky effect. It is turning out to be even more interesting than we expected. Our five sessions taken with the 0.65-m at Ondrejov, the 0.6-m at Skalnate Pleso and the 1.54-m at La Silla show a complex lightcurve; it may be a tumbler or a binary. A tentative fit:
http://www.asu.cas.cz/~asteroid/162004.png
(We have got also data taken by Joe Pollock with Prompt on two nights, but they are multiple short sessions with durations <= 1.0 h, too short relative to the asteroid's periods and thus they don't contribute to its complex lightcurve solution at this time; they should be useful for checking consistency of a solution that we will get with more data on following nights.)

We need more data, especially from significantly different longitudes than ours, to establish solution for this interesting case. I encourage those of you able to take long sessions for it with errors < 0.05 mag to observe it.

Clear Skies, Petr [2012-11-15 10:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing tonight from 20:30 UT. Peter K. [2012-11-06 23:50, Ondrejov]

(24475) 2000 VN2 (Finished) [Add new note]
· Inconclusive: Long period or low amplitude. Petr [2012-10-24 04:28, Ondrejov]

· While 3673 is not so high above horizon, I observe this asteroid. I can observe it at the end of this night again, although it is not expected to reveal any variation during the single night. Adrian [2012-03-02 19:03, Modra] Message sent to observers

· Began run from NC at 0000 UT. Hope to get 7 hours to see if any variation can be seen. This is also a current Arecibo radar object. Joe [2011-12-29 01:33, Dark Sky & PROMPT]

· I added few points last night. Hopefully, we can obtain second (and linked) session soon to be sure if it is slow rotator or has very flat lightcurve. Peter K. [2011-12-15 19:33, Ondrejov] Message sent to observers

· Observed 2011 11 27 in reasonable conditions. Session cut short due to pointing error. 4hrs of data indicates no variation in the lightcurve within +/- 0.02mag. [2011-11-28 08:28, HuntersHill] Message sent to BinAstPhotSurvey conference

(63440) 2001 MD30 (Finished) - paired asteroid [Add new note]
· This paired asteroid has been done by Peter Kusnirak from here on the past four nights (target in the NEOSource project Task 2, Multiplicity of asteroid pairs):
http://www.asu.cas.cz/~asteroid/063440_b2.png
cf. with our data from the 1.54-m on La Silla and the 1-m of the Wise Observatory in 2009 (published in Pravec et al. 2010):
http://www.asu.cas.cz/~asteroid/063440.png

No sign of binarity. Done for the project.

Cheers, Petr [2012-10-12 11:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:50 UT (after 44612). Sky is still great. Peter K. [2012-10-12 01:26, Ondrejov] Message sent to observers

· Observed from 22 UT under improving sky. Peter K. [2012-10-11 03:15, Ondrejov]

· Observing from 18 UT. Peter K. [2012-10-09 18:32, Ondrejov]

· Trying to observe this paired asteroid from 22:25 UT. Peter K. [2012-10-08 23:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done ok. Petr [2009-10-01 07:43, Ondrejov]

· Started at around 01:00 UT. Last night's run foiled by the crowded star field. [2009-08-26 01:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 00:50 UT.
Don [2009-08-25 01:07, CarbuncleHill]

· Started a run at 01:10 UT.
Don [2009-08-18 02:00, CarbuncleHill]

· Started a run at 01:05 UT.
Don [2009-08-15 01:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 02:20 UT.
Don [2009-08-02 02:17, CarbuncleHill]

· Starting this paired asteroid at 03:05 UT.
Don [2009-07-11 02:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(25041) 1998 QX40 (Finished) [Add new note]
· This new target was worked by Peter Kusnirak from here (3 nights) and by Joe Pollock and Zach Vanderplate with Prompt (1 night): Unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/25041.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-08-29 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for almost 5 hours last night. Peter K. [2012-08-13 09:24, Ondrejov] Message sent to observers

· Observed for almost 4 hours last night but clouds interfered in first half of session. Peter K. [2012-08-12 07:04, Ondrejov]

· Planning to observe this one tonight. Period estimate from two PROMPT's sessions is ~4.3 h. Peter K. [2012-08-08 19:59, Ondrejov] Message sent to BinAstPhotSurvey conference

(12789) Salvadoraguirre (Finished) [Add new note]
· This new target was done by Peter Kusnirak from here, by Joe Pollock and Zach Vanderplate with Prompt, and by Julian Oey from Leura: Unique solution, good coverage, no prominent deviation,
http://www.asu.cas.cz/~asteroid/12789.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-08-29 07:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 5.5 hours last night and TARGET IS FINISHED. Peter K. [2012-08-16 14:11, Ondrejov] Message sent to observers

· Planning to observe tonight but clouds may come later. Peter K. [2012-08-14 19:38, Ondrejov]

· Observed for 6 hours last night. Peter K. [2012-08-14 05:52, Ondrejov] Message sent to BinAstPhotSurvey conference

(6376) Schamp (Finished) [Add new note]
· Bob Stephens and Joe Pollock did this new target on three and two nights, respectively: Unique period, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/06376.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-08-02 08:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have also gotten three nights on 6376 Schamp calculating a period of 6.613 hours.

Bob Stephens [2012-07-31 15:59, Santana] Message sent to observers

· Joe Pollock has worked this new target on two nights, one with their 32" and one with Prompt. A preliminary solution:
http://www.asu.cas.cz/~asteroid/06376.png
It is not unique of course. A few full night runs (errors not greater than 0.02 mag) will be good. Joe plans to take more data when the moon is out of the way, but we encourage others to contribute.

Clear Skies, Petr [2012-07-31 07:57, Ondrejov] Message sent to BinAstPhotSurvey conference

(6741) Liyuan (Finished) [Add new note]
· Joe Pollock and Zach Vanderplate worked this new target with Prompt on four nights, supported with one night by Gabo Cervak and Marek Husarik from Skalnate Plese that eliminated aliases with 1 day: an U = 3- solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/06741.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-08-01 06:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· My targrt object this night. Gabo [2012-07-23 18:58, SkalnatePleso] [Remove]

(21910) 1999 VT23 (Finished) [Add new note]
· Insufficient data for the Survey, target closed now. Petr [2012-07-31 09:44, Ondrejov]

· Observed 2012 06 08 in reasonable conditions. Data reveals a period of around 9.4hrs with an amplitude of 0.35mag [2012-06-11 07:34, HuntersHill] Message sent to BinAstPhotSurvey conference

(17007) 1999 CK65 (Finished) [Add new note]
· This new target was done by Peter Kusnirak, Kamil Hornoch and Jan Vrastil from here, by Leos Kornos from Modra, by Audrey Thirouin from La Hita and by Don Pray from Sugarloaf Mountain. Don's night has eliminated aliases present in solution from the four European nights and we have got an U = 3- solution now,
http://www.asu.cas.cz/~asteroid/17007.png
For the slowish rotator, we don't require a double period coverage, so the target is closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work all.

Cheers, Petr [2012-07-26 06:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 02:55 UT.
Don [2012-07-25 02:55, Sugarloaf]

· Five sessions (durations 2.9 to 5.4 h) on four nights were taken for this new target by Peter Kusnirak, Kamil Hornoch and Jan Vrastil from here, by Leos Kornos from Modra and by Audrey Thirouin from La Hita. One of a few possible solutions:
http://www.asu.cas.cz/~asteroid/17007.png
There remains a cycle ambiguity between the nights that we cannot solve with observations from the limited range of longitudes of our stations in Europe now. A help from a station on other continent (one full night) would be appreciated.

Clear Skies, Petr [2012-07-24 07:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one tonight from 20:30 UT. Best wishes, Kamil [2012-07-23 21:02, Ondrejov] Message sent to observers

· Observed in 22/23. June. Leos [2012-07-23 09:04, Modra]

· Observed tonight, good conditions. From 21:15 to 01:50 UT. Honza V. [2012-07-23 01:21, Ondrejov] Message sent to observers

· Observed for 3 hours tonight. Peter K. [2012-07-10 01:04, Ondrejov] Message sent to BinAstPhotSurvey conference

(12415) Wakatatakayo (Finished) [Add new note]
· Joe Pollock and Zach Vanderplate did this new target with PROMPT on two nights: Unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/12415.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-07-25 07:32, Ondrejov] Message sent to BinAstPhotSurvey conference

(6680) 1970 WD (Finished) [Add new note]
· Joe Pollock and Zach Vanderplate took two 7.6-7.9 h long nights for this new target with Prompt. The noise is just around the limit for the BinAstPhotSurvey (the rms residual of 0.03 mag), but they are useable data, also since they are a good amount of data points that beats the noise. A unique solution, good coverage, no deviation seen:
http://www.asu.cas.cz/~asteroid/06680.png
Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Joe and Zach.

Cheers, Petr [2012-07-23 06:45, Ondrejov] Message sent to BinAstPhotSurvey conference

(26093) 1987 UA1 (Finished) [Add new note]
· Don Pray worked this one from Sugarloaf Mountain on seven short nights, supported by one night from Zuzana Kanuchova and Marek Husarik from Skalnate Pleso: an U = 2+ solution (period twice as long is not ruled out), with several decreased points on 2012-07-09.2 unexplained:
http://www.asu.cas.cz/~asteroid/26093.png

Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2012-07-18 13:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 03:30 UT in variable haze.
Don [2012-07-17 03:44, Sugarloaf]

· I plan to start a run at 03:20 UT. Conditions are very good.
Don [2012-07-12 02:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 03:40 UT.
Don [2012-07-11 03:40, Sugarloaf]

· Began a run at 03:45 UT.
Don [2012-07-10 03:51, Sugarloaf]

· Started at 21 UT, zuzana [2012-07-09 21:06, SkalnatePleso] [Remove]
Message sent to observers

· Started a run at 03:40 UT.
Don [2012-07-09 03:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Will be starting this new target at 03:40 UT.
Don [2012-07-08 03:12, Sugarloaf]

(7914) 1978 UW7 (Finished) [Add new note]
· This one is closed now. Don Pray took five nights from Sugarloaf Mountain, Kamil Hornoch and Peter Kusnirak took five nights from here, and Audrey Thirouin took one night from Calar Alto. (All the nights were short.) An U = 2+ solution:
http://www.asu.cas.cz/~asteroid/07914.png
Period twice as long looks less likely, but we cannot quite rule out it. No substantial deviation seen. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, folks, during these short June-July nights.

Cheers, Petr [2012-07-12 11:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started tonight's observations of this one. Peter K. [2012-07-08 20:55, Ondrejov] Message sent to observers

· Started this at 03:05 UT.
Don [2012-07-08 03:10, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing from 20:30 UT. [2012-07-07 21:33, SkalnatePleso] [Remove]
Message sent to observers

· Kamil Hornoch from here and Don Pray from Sugarloaf Mountain took six short (durations 0.4-3.3 h) sessions for this one. A possible, but not unique solution:
http://www.asu.cas.cz/~asteroid/07914.png

At least a couple (longer, if possible) sessions will be needed to establish this one. Extending the coverage in longitude to west from Don's site or to east from our site should be also very useful.

Clear Skies, Petr [2012-07-01 07:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 05:00 UT.
Don [2012-06-29 01:53, Sugarloaf]

· Plan to start this at 05:10 UT. Last attempt on this one ended because of clouds.
Don [2012-06-24 02:59, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this new target after 88259 sets.
Don [2012-06-22 03:05, Sugarloaf]

(5953) Shelton (Finished) [Add new note]
· Don's observations have shown this new target to be a slow(ish) rotator. Note added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
and the target closed for the BinAstPhotSurvey.

Petr [2012-06-22 07:35, Ondrejov] Message sent to observers

· Doing a second run on this. Started at 02:50 UT.
Don [2012-06-15 04:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1090) Sumida (Finished) [Add new note]
· Observing this one tonight. Best wishes, Kamil [2012-06-19 23:20, Ondrejov] Message sent to BinAstPhotSurvey conference

(6498) Ko (Finished) [Add new note]
· Five linked nights by Peter Kusnirak and Kamil Hornoch from here revealed this new target to be a slow rotator, P ~ 500 h effectively being a lower limit, see the data plotted with a half of the period:
http://www.asu.cas.cz/~asteroid/06498.png
Closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good attempt, guys.

Cheers, Petr [2012-06-19 14:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing as a complementary target tonight. Peter K. [2012-06-15 21:50, Ondrejov] Message sent to observers

· Observed this one and (2189) tonight. Best wishes, Kamil [2012-06-15 00:56, Ondrejov]

· Observed 2012-06-07 and 08 in reasonable conditions. Data reveals small undulations through each session but no definitive period. Possible long period target. [2012-06-11 06:54, HuntersHill] Message sent to observers

· Began this new target from the May list at 0200 UT from Prompt under excellent conditions. Joe [2012-05-17 02:31, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(49904) 1999 XN165 (Finished) [Add new note]
· This new target was shown to be a moderately slow rotator from observations by Leos Kornos and Jozef Vilagi from Modra, but the short runs didn't allow us to get a unique solution; one of a few possible is following:
http://www.asu.cas.cz/~asteroid/49904.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2012-06-12 15:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed tonight another short sesion; will be linked with yesterdays data. Leos, Jozef. [2012-03-21 03:55, Modra]

· Planning a longer session soon, starting ~22:35UT. Leos, Jozef. [2012-03-19 22:28, Modra]

· Next 2-hours session in March 17/18. Leos [2012-03-18 21:09, Modra]

· Observed two shorter sessions in nights 15/16 and 16/17. March. Leos [2012-03-17 15:54, Modra] Message sent to BinAstPhotSurvey conference

(7758) Poulanderson (Finished) - binary candidate by Brian Warner [Add new note]
· This Brian Warner's binary candidate is closed for this apparition, thorough observations in a future favorable apparition will be needed to establish. Petr [2012-06-12 14:54, Ondrejov]

· Observing from 19:40 UT in a good conditions. Michal [2012-05-26 22:41, SkalnatePleso] [Remove]
Message sent to observers

· Starting this at 01:35 UT under very good conditions.
Don [2012-05-18 01:25, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing from 20:30 UT in variable conditions. Peter K. [2012-05-16 23:59, Ondrejov] Message sent to observers

· Doing a run at 02:15 UT. Clouds may interfere.
Don [2012-05-13 01:51, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I will also do a run on this starting at 02:15 UT.
Don [2012-05-12 01:01, Sugarloaf]

· Observing this target tonight. Weather on the following 2-3 nights will be bad.
Marek [2012-05-11 22:01, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(6381) Toyama (Finished) [Add new note]
· Slow rotator, revealed from observations by Jim Brinsfield from Via Capote and David Higgins from Hunters Hill. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2012-06-12 14:32, Ondrejov]

· Partial to near full nights on 27/4, 10/5, 16/5, 19/5 and 20/5 show only 0.2 mag variation overall with very small undulations during the longer runs (<0.07mag total variation) [2012-05-20 22:20, HuntersHill] Message sent to observers

· Getting full-night run for this one tonight. Best wishes, Kamil [2012-05-01 20:01, Ondrejov]

· Observed under good conditions from 04:30 to 11:00UT Exhibiting a possible very low amplitude curve~6.7hr 0.05M. Plan is to increase this target back to a first priority and continue to monitor. [2012-04-29 12:29, Via Capote] Message sent to observers

· Started this new object at 04:15UT and observed for 6.5 hours. Appears to be a long period object with about a 0.1 mag increase over the session [2012-04-28 12:56, Via Capote]

(5524) Lecacheux (Finished) [Add new note]
· This new target was done by Jim Brisnfield from Via Capote, supported by Peter Kusnirak from here and by Marek Husarik and Gabriel Cervak from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/05524.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Best, Petr [2012-06-12 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 3 hours last night as well as on May 20 (for 2 hours). Period seems to be around 8.4 hours (ampl. 0.75 mag) but more observations are still needed to improve period estimate and coverage of LC. Peter K. [2012-05-23 09:41, Ondrejov] Message sent to observers

· Observed under good conditions from 04:45 to 11:00UT. This target appears to have a period of ~ 10.7 hours 0.70M. Will continue to monitor the target as a secondary priority target [2012-04-29 12:34, Via Capote] Message sent to observers

(3554) Amun (Finished) - YORP target - one lightcurve once a month needed [Add new note]
· This YORP-detection target is closed for this apparition. More data in following years will be needed. Petr [2012-06-11 14:00, Ondrejov]

· Beginning run from Prompt at 0630 UT. Joe [2012-04-03 06:13, Dark Sky & PROMPT] Message sent to observers

· It was observed from 21:30 to 02 UT from Abastumani on 2012-03-17. [2012-03-20 09:24, Kharkiv]

· Doing this one starting at 06:40 UT, to fill telescope time after the earlier targets are finished.
Don [2012-02-27 01:38, Sugarloaf] Message sent to BinAstPhotSurvey conference

· observed for the required one lightcurve under good observing condition. [2012-02-25 09:00, Blue Mountains Obs] Message sent to observers

· This YORP-detection target was done by Jan Vrastil and Kamil Hornoch from here on first two nights in this apparition:
http://www.asu.cas.cz/~asteroid/03554_120221.png
http://www.asu.cas.cz/~asteroid/03554_120130.png

Taking one lightcurve (2.53 h) each couple weeks, especially from southern stations as the asteroid moves south, will be needed for its YORP solution.

Clear Skies, Petr [2012-02-21 11:27, Ondrejov] Message sent to BinAstPhotSurvey conference

(17170) Vsevustinov (Finished) [Add new note]
· This new target has been done by Vasilij Chiorny from Kharkiv and by Marek Husarik from Skalnate Pleso: Unique period, sufficient coverage, no deviation:
http://www.asu.cas.cz/~asteroid/17170.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-05-31 14:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this object of 14 may from 19:50 to 23:00 U.T.
Vasilij Ch. [2012-05-15 11:21, Kharkiv] Message sent to observers

· Here is a single session taken by Vasilij: http://www.asu.cas.cz/~asteroid/17170.png - Two more nights (4+ hours long, best if consecutive) should finish this one. Peter K. [2012-05-11 11:18, Ondrejov]

· Observing this target on night 28/29 April 2012 during 5 hours. Previously, period of rotation about 3.37 h.
The data send to Peter K. Vasilij Ch. [2012-05-10 13:52, Kharkiv] Message sent to observers

· Starting this new target tonight. Conditions are poor with wind and passing cloud, so I may not get much. Also getting some points on the slow rotators, 2772 and 51381.
Don [2012-04-28 03:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

(51381) 2001 BG51 (Finished) [Add new note]
· This new target was shown to be a slow rotator by Don Pray from Sugarloaf Mountain, Brian Warner from PDO, and Marek Husarik and Gabo Cervak from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/51381.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2012-05-24 13:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 01:20 UT as a secondary target.
Don [2012-05-18 01:26, Sugarloaf]

· Started this one at 01:20 UT as a secondary target.
Don [2012-05-13 01:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Starting this one at 01:00 UT as a secondary target.
Don [2012-05-12 00:59, Sugarloaf]

· Observing this night from 19:00 UT. Gabo [2012-04-28 18:05, SkalnatePleso] [Remove]
Message sent to observers

· I've done a couple runs on this over the last couple of weeks and it looks like a slow rotator.
Don [2012-04-25 20:06, Sugarloaf] Message sent to BinAstPhotSurvey conference

(20136) Eisenhart (Finished) [Add new note]
· This new target has been done by Don from Sugarloaf Mountain: Unique solution, good coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/20136.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, Don.

Cheers, Petr [2012-05-24 12:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began a run on this at 01:30 UT.
Don [2012-05-21 03:20, Sugarloaf]

· Starting this at 01:20 UT.
Don [2012-05-20 01:14, Sugarloaf]

· Started this new target at 02:50 UT.
Don [2012-05-19 02:52, Sugarloaf] Message sent to BinAstPhotSurvey conference

(22601)1998 HD124 (Finished) [Add new note]
· This new target was observed by Jim Brinsfield from Via Capote, by Jozef Vilagi and Jiri Silha from Modra, by Kamil Hornoch from here and by Marek Husarik and Gabriel Cervak from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/22601.png

It is sufficient data for this one for the Survey; target closed:
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2012-05-03 12:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to observe ~20-02 UT. Jozef, Jiri. [2012-05-01 17:22, Modra]

· Observed this one tonight from ~20:50-01:55 UT. Jozef, Jiri. [2012-05-01 02:47, Modra]

· This target was observed on UT 4.20.2012 and appeared to exhibit a long period of about 13 hours with ~ 0.80M.

A lower priority target now, plan to observe tonight (UT28) as a secondary target. [2012-04-27 13:02, Via Capote] Message sent to observers

· plan to start this new target 06:30 - 11:45UT [2012-04-20 01:58, Via Capote] Message sent to BinAstPhotSurvey conference

(11001) Andrewulff (Finished) - binary suspect, confirmation needed [Add new note]
· An extensive effort by Don Pray from Sugarloaf Mountain and Jim Brinsfield from Via Capote, supported with a few nights by Kamil Hornoch, Peter Kusnirak and Jan Vrastil from here, by Marek Husarik and Gabriel Cervak from Skalnate Pleso, and by Jozef Vilagi from Modra: Suspect attenutions after to the beginnings or before the ends of a few sessions seen, but inconclusive. One block of the data:
http://www.asu.cas.cz/~asteroid/11001.png

Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great efort all, despite the inconclusive result.

Petr [2012-05-03 11:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 04:00 to 06:30 as a secondary priority target. [2012-04-19 13:34, Via Capote] Message sent to observers

· observed from 03:45 to 06:30 as a secondary priority. No deviations have been observed. [2012-04-18 13:35, Via Capote]

· observed under good conditions from 04:00 to 08:00UT. [2012-04-16 13:40, Via Capote] Message sent to observers

· planning to run this object all night starting at 05:00UT under good conditions [2012-03-28 03:59, Via Capote]

· Starting this one at 02:30 UT. Getting a few points on 2772 leading up to 11001. The forecast calls for clouds moving in, hopefully later rather than sooner.
Don [2012-03-28 01:35, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Observing from 0 UT (after finishing 5477) as complementary target to 2772 and 79472. Peter K. [2012-03-28 00:19, Ondrejov] Message sent to observers

· plan to start this object at 05:10UT [2012-03-27 02:11, Via Capote]

· Plan to start this at 03:30 UT.
Don [2012-03-23 00:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Finished at 21:18UT due to hardware failure. Jozef, Stefan. [2012-03-22 22:42, Modra]

· Observing it from 20:49 UT. Jozef/Stefan [2012-03-22 21:15, Modra]

· I plan to do this between 3 and 6 UT and should provide continuity between Modra and Via Capote.
Don [2012-03-21 23:33, Sugarloaf] Message sent to BinAstPhotSurvey conference

· The weather looks to be good here tonight so I plan to run 11001 from about 05:00 to ~ 12:00 [2012-03-21 21:40, Via Capote] Message sent to observers

· Planning this one from 20:45UT. Jozef [2012-03-21 20:05, Modra]

· I plan to start this at 03:40 UT, wind permitting.
Don [2012-03-21 00:59, Sugarloaf] Message sent to BinAstPhotSurvey conference

· I plan to start this at 03:45 UT. Should get around 5 hours.
Don [2012-03-20 00:56, Sugarloaf]

· conditions are good here and I plan to run this target for a full session [2012-03-20 00:28, Via Capote] Message sent to observers

· This new target was observed by Don Pray from Sugarloaf Mountain, by Marek Husarik from Skalnate Pleso and by Kamil Hornoch from here on six nights (but they were relatively short, between 2.4 and 4.0 h). There appears to be an attenuation on one Don's night:
http://www.asu.cas.cz/~asteroid/11001_p1.png
A possible solution for period of the attenuations:
http://www.asu.cas.cz/~asteroid/11001_porb.png

We need to confirm it with capturing more mutual events and establishing their period. I encourage more people here to help out.

Clear Skies, Petr [2012-03-19 15:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this one at 03:30 UT.
Don [2012-03-19 00:31, Sugarloaf]

· Observing from 21:40 UT.
Marek, Gabo [2012-03-18 21:31, SkalnatePleso] [Remove]
Message sent to observers

· Started a run at 03:35 UT. Variable haze may cause problems.
Don [2012-03-18 03:44, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Stopped due to wind.
Marek [2012-03-18 00:44, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 21:40 UT until the stronger wind allows me.
Marek [2012-03-17 21:42, SkalnatePleso] [Remove]

· Plan to start this one at 00:00 UT for 3.5h. Best wishes, Kamil and Honza [2012-03-16 21:27, Ondrejov] Message sent to observers

· Plan to start this at 04:30 UT.
Don [2012-03-15 02:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2772) Dugan (Finished) [Add new note]
· Don Pray found this new target to be a slow rotator:
http://www.asu.cas.cz/~asteroid/02772.png
Closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2012-05-02 12:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 0 UT (after finishing 5477) as complementary target to 11001 and 79472. Peter K. [2012-03-28 00:18, Ondrejov] Message sent to observers

· Did a short run on this on Mar 22. Looks flat over a couple hours.
Don [2012-03-23 00:54, Sugarloaf] Message sent to BinAstPhotSurvey conference

(1156) Kira (Finished) [Add new note]
· Joe Pollock has observed this new target on three nights: Unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/01156.png
It is done for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-04-12 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

(6825) Irvine (Finished) - mini-family member [Add new note]
· Done for the apparition. Petr [2012-04-02 11:10, Ondrejov]

· It was observed from 16:30 to 20:15 UT at Abastumani last night. [2012-03-20 09:19, Kharkiv] Message sent to observers

· I'm doing this one tonight from 18:45 to ~23:00. Quite good condition relative to yesterday from the beginning, later - cloudy. Honza [2012-03-18 20:11, Ondrejov]

· Good data taken by Stefan Gajdos from Modra on the past night:
http://www.asu.cas.cz/~asteroid/06825_12b.png
Cf. with data from the previous lunation:
http://www.asu.cas.cz/~asteroid/06825_12a.png

This is sufficient data for this mini-family member for this lunation. Taking one more lightcurve in the next lunation will be good.

Cheers, Petr [2012-02-15 10:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 17:34 UT, Feb.14, 2012.
Stefan [2012-02-14 18:10, Modra] Message sent to observers

· Don has taken a long run on 01-19 and he also checked his data from 01-15, revealed that one of the observed minima was affected by a background star contamination. The asteroid has shown a moderate lightcurve evolution since 12-28, but there don't appear any significant deviations recently that would require more data to be taken now. Taking one more lightcurve in the next lunation will be good.
http://www.asu.cas.cz/~asteroid/06825.png

Cheers, Petr [2012-01-20 05:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started on Irvine at 20h30 UT at Pic du Midi , weather forecast was not good, we closed at 21h30 due to clouds...

Francois [2012-01-19 21:31, Pic du Midi] Message sent to observers

· Started a run at 01:45 UT.
Don [2012-01-19 02:02, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Two nights by Don Pray from Sugarloaf Mountain and one night by Marek Husarik et al. from Skalnate Pleso show an interesting lightcurve behavior in this one: Depths of the minima change up and down in a way that is not consistent with a simple amplitude-phase effect. A possible explanation is that there is present a second lightcurve component (satellite? tumbling?).
http://www.asu.cas.cz/~asteroid/06825.png
More data are needed to reveal. I encourage all to help out.

For completness, a single-night 2009 lightcurve by Francois Colas from Pic du Midi:
http://www.asu.cas.cz/~asteroid/06825_a9.png

Clear Skies, Petr [2012-01-17 08:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start this at 04:20 UT. This will be the second consecutive night on this and it should finish it.
Don [2012-01-16 00:25, Sugarloaf]

· Plan to start a run on this at 04:00 UT.
Don [2012-01-15 00:46, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Two nights for this one by Marek Husarik et al. from S. Pleso and by Don Pray from Sugarloaf Mountain indicate a period about 3.62 h (U = 2+):
http://www.asu.cas.cz/~asteroid/06825.png

Two sessions (not necessarilly full-night runs; a minimum coverage needed is a 3.6-h run on one and a 2-h run on the other night) during this lunation will be needed to nail it down.

Clear Skies, Petr [2012-01-11 15:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Dec 27, but reduced now. Run >9 hr long. Period estimated at 3.6 hr and amplitude 0.7 mag.
Marek [2012-01-11 14:34, SkalnatePleso] [Remove]

(3481) Xianglupeak (Finished) - suspect attenuations seen [Add new note]
· Binary suspect, needs to be confirmed in a following apparition. Petr [2012-04-02 09:21, Ondrejov]

· Started a run at 00:30 UT. Will go until 03:30.
Don [2012-03-23 00:45, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Will run this from about 00:15 to 03:00 UT, leading into 11001.
Don [2012-03-21 23:37, Sugarloaf]

· Started a run in breezy condition at 00:40 UT.
DOn [2012-03-21 00:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:15 UT. Will get about 3.5 hours.
Don [2012-03-20 00:52, Sugarloaf]

· Observing from ~18:40. Jozef, Leos. [2012-03-19 18:41, Modra]

· Observed at night 15/16. 03 2012 from 18:00 to 21:30 UT. Leos [2012-03-16 10:50, Modra]

· Started a short run on this at 02:00 UT leading into a run on 11001.
Don [2012-03-15 02:05, Sugarloaf] Message sent to BinAstPhotSurvey conference

· An extensive effort by Marek Husarik, Michal Pikler and Gabriel Cervak from Skalnate Pleso, by Don Pray from Sugarloaf Mountain, and by Leos Kornos and Jozef Vilagi from Modra:
http://www.asu.cas.cz/~asteroid/03481.png
Three suspect deviations (small to moderately deep attenuations) seen, there are a few possible solutions for their period, but not conclusive yet. Last observations (with errors not greater than 0.02 mag) for this apparition might be useful after the full moon, or a confirmation may be attempted in a future apparition.

Clear Skies, Petr [2012-03-05 11:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Tonight , at Pic du Midi , with the T60 , we plan to observ this target . Plan to start at 19:00 UT [2012-02-29 18:04, OPERA]

· The sky is remaining unexpectedly clear, so I'm doing a run on this until I can't. Started at 00:40 UT.
Don [2012-02-29 00:48, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Don Pray's observations of Feb 27 don't fit with the other data remarkably:
http://www.asu.cas.cz/~asteroid/03481.png
(The data are on a relative magnitude scale, so their vertical position is arbitrary.)

As Don will not be able to observe it for nearly two weeks, I encourage someone here to take over and attempt to describe what is going on there.

Clear Skies, Petr [2012-02-28 15:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 00:30 UT.
Don [2012-02-27 01:32, Sugarloaf]

· Started at 23:50, Feb 23 UT. Clouds will be here in ~4 hours.
Don [2012-02-24 00:00, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started this at 00:00. Star field is very dense.
Don [2012-02-21 02:38, Sugarloaf]

· Observing from 21:30 UT in relatively good conditions. Michal [2012-02-20 21:37, SkalnatePleso] [Remove]
Message sent to observers

· Observing from ~21:25UT in good conditions. Leos, Jozef. [2012-02-20 21:25, Modra]

· Observing from 22:15 UT in relatively good conditions. Michal [2012-02-18 22:17, SkalnatePleso] [Remove]
Message sent to observers

· Marek Husarik and Gabriel Cervak from Skalnate Pleso worked this new target on three nights recently. The first few points of their 2012-02-12 session are attenuated:
http://www.asu.cas.cz/~asteroid/03481_120212.png
There was no obvious observational problem, so I encourage others here to help out to confirm the suspect attenuation.

Clear Skies, Petr [2012-02-15 10:57, Ondrejov] Message sent to BinAstPhotSurvey conference

(79472) 1998 AX4 (Finished) [Add new note]
· Observing from 0 UT (after finishing 5477) as complementary target to 2772 and 11001. Peter K. [2012-03-28 00:19, Ondrejov] Message sent to observers

· Observing this one from 18:53 UT and expecting full-night run. Best wishes, Kamil [2012-03-24 18:56, Ondrejov] Message sent to BinAstPhotSurvey conference

(5968) Trauger (Finished) [Add new note]
· Brian Warner calls this one over now. He will work it around a future favorable opposition. [2012-03-26 09:10, Ondrejov]

· Brian Warner has observed this one in two earlier apparitions of 2005 and 2010, got solutions that didn't agree with one another. He took three sessions in the current third apparition of this asteroid, got a period of 3.789 h that agrees with the 2005 data, but there are apparent deviations from the mean curve with depths of several 0.01 mag. The data folded with the 3.789-h period:
http://www.asu.cas.cz/~asteroid/05968.png

We suspect that the deviations may have a period nearly commensurate with 1 day, in which case Brian wouldn't be able to resolve this case with his PDO observations only. I encourage others here to help out with observations from substantially different longitudes.

Clear Skies, Petr [2012-03-23 17:14, Ondrejov] Message sent to BinAstPhotSurvey conference

(14627) Emilkowalski (Finished) - mini-family member [Add new note]
· The current apparition for this mini-family asteroid has been completed with last three runs in this lunation, two by Kamil Hornoch and Jan Vrastil from here and one by Stefan Gajdos from Modra. The data:
http://www.asu.cas.cz/~asteroid/14627_1201.png
http://www.asu.cas.cz/~asteroid/14627_1202.png
http://www.asu.cas.cz/~asteroid/14627_1203.png

More observations in future apparitions will be needed for spin vector and shape modeling.

Good work all.

Cheers, Petr [2012-03-22 09:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one as complementary target to (5407)from 18:45 UT in very good conditions. Best wishes, Kamil [2012-03-21 21:09, Ondrejov] Message sent to observers

· Observed last night from 19:52 UT for about 5 hours.
Stefan [2012-03-12 13:00, Modra]

· Kamil Hornoch and Jan Vrastil done this one sufficiently for this lunation:
http://www.asu.cas.cz/~asteroid/14627_1202.png
http://www.asu.cas.cz/~asteroid/14627_1201.png

Taking one more full period coverage in the next lunation in March will be good; it will be its last observations for this apparitions.

Good work, Kamil and Jan.

Cheers, Petr [2012-02-23 07:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· This main body of its cluster (mini-family) was worked well as a supplementary target by Kamil from here, by Leos and Jozef from Modra, by Don from Sugarloaf Mountain, and by Marek and Michal from Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/14627.png

No more data are needed in this lunation. Working it again as a supplementary target in the next lunation will be good.

Good work all!

Cheers, Petr [2012-01-27 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 02:00 UT in good conditions. Michal [2012-01-27 02:17, SkalnatePleso] [Remove]
Message sent to observers

· Observed this one in two nights 20/21 and 24/25 in variable conditions. the estimated half-period is about 6h and the max. observed variation around 0.7mag. Leos, Jozef. [2012-01-25 15:47, Modra]

· I started this new target at 01:45 UT as a secondary target.
Don [2012-01-22 01:58, Sugarloaf] Message sent to BinAstPhotSurvey conference

(2648) Owa (Finished) [Add new note]
· Done reasonably by David Higgins on two nights, no deviation. Closed for the second apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-03-06 13:02, Ondrejov] Message sent to observers

· At last a clear night....... Observed 2012-02-024 from 1050UT to 1835UT in reasonable conditions. Data reveals a period of 3.56 +/- 0.02hrs with an amplitude of 0.33 +/- 0.02mag [2012-02-24 09:27, HuntersHill] Message sent to BinAstPhotSurvey conference

· Don has done this one well on three nights: Unique period, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/02648.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, Don.

Cheers, Petr [2007-11-01 10:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· I had room left for a bright target, so I started this at 00:45 UT.
Don [2007-10-21 01:04, CarbuncleHill]

(6529) Rhoads (Finished) [Add new note]
· Unsuccessful observations ? [2012-02-27 14:11, Ondrejov]

· Observed last night 0145-0845 UT from Prompt under good conditions. Joe [2012-01-22 17:01, Dark Sky & PROMPT] Message sent to observers

(2745 SanMartin (Finished) [Add new note]
· Unsuccessful observations ? [2012-02-27 14:10, Ondrejov]

· Started observing this new object from Prompt at 0050 UT. Hoping clouds will remain to north. Joe [2011-12-26 00:57, Dark Sky & PROMPT] Message sent to BinAstPhotSurvey conference

(4826) Wilhelm (Finished) - slow rotator [Add new note]
· Julian Oey has revealed this one to be a slow rotator,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Closed for the Survey.

Petr [2012-02-17 13:36, Ondrejov]

· some data obtained during the month of November 11/14,11/15,11/26,11/27,11/28 found the period to be about 54h. data sent in. [2011-12-30 09:25, Blue Mountains Obs] Message sent to observers

· Observed 2011 11 27 in reasonable conditions. Session cut short due to pointing error but 3 hrs data taken indicating a long period target. [2011-11-28 08:26, HuntersHill] Message sent to BinAstPhotSurvey conference

(175706) 1996 FG3 (Finished) - NEA binary [Add new note]
· Campaign in progress with larger telescopes. Petr [2012-02-08 14:20, Ondrejov]

· Started at 00:20 UT to catch the 0.259 phase event.
Don [2012-01-16 00:23, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run at 23:20 Jan 14 UT to catch the 0.756 phase event. Wind may not cooperate, however.
Don [2012-01-15 00:44, Sugarloaf]

· This NEA binary is one of the most interesting ones: it is a BYORP detection target as well as a target for a planned space mission by ESA. In this return apparition, it was well observed by Don Pray from Sugarloaf Mountain (4 nights)
by I. Slyusarev and Yura Krugly from Kharkiv (2), by Peter Kusnirak and Kamil Hornoch from here (2), by Adrian Galad from Modra (1), and by Joe Pollock with PROMPT (1 night):
http://www.asu.cas.cz/~asteroid/96fg3_111215_120103_porb.png
http://www.asu.cas.cz/~asteroid/96fg3_111215_120103_p1.png
http://www.asu.cas.cz/~asteroid/96fg3_111124_111125_porb.png
http://www.asu.cas.cz/~asteroid/96fg3_111124_111125_p1.png
There are more observations coming. After the apparition is over (last observations may be taken with 2-2.5m telescopes in March-April) and the dataset is completed, we will run a final solution and model and we plan to write a paper in late spring and summer; Petr Scheirich will present implications for BYORP theory at the ACM conference in Japan in May - a preliminary look shows that he will get a unique solution for the drift in mean anomaly, which appears to be consistent with the new theory by Jacobson and Scheeres (2011) for BYORP being counter-balanced by tides in systems with synchronous secondary.

More observations during January-April will be useful to further improve the solution, but the asteroid may be already too faint for most in this group now; don't bother unless you can get data with errors < 0.02 mag. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-12 17.62 0.259
2012- 1-13 9.76 0.259
2012- 1-14 1.90 0.259
2012- 1-14 18.04 0.259
2012- 1-15 10.18 0.259
2012- 1-16 2.32 0.259
2012- 1-16 18.46 0.259
2012- 1-17 10.60 0.259
2012- 1-18 2.74 0.259
2012- 1-18 18.88 0.259
2012- 1-19 11.02 0.259
2012- 1-20 3.16 0.259
2012- 1-20 19.30 0.259
2012- 1-21 11.44 0.259
2012- 1-22 3.58 0.259
2012- 1-22 19.72 0.259
2012- 1-23 11.86 0.259
2012- 1-24 4.00 0.259
2012- 1-24 20.14 0.259
2012- 1-25 12.28 0.259
2012- 1-26 4.42 0.259
2012- 1-26 20.56 0.259
2012- 1-27 12.70 0.259
2012- 1-28 4.84 0.259
2012- 1-28 20.98 0.259
2012- 1-29 13.12 0.259
2012- 1-30 5.26 0.259
2012- 1-30 21.40 0.259
2012- 1-31 13.54 0.259

Date/Time UTC (LTc.) Phase
--------------------------
2012- 1-13 1.64 0.756
2012- 1-13 17.78 0.756
2012- 1-14 9.92 0.756
2012- 1-15 2.06 0.756
2012- 1-15 18.20 0.756
2012- 1-16 10.34 0.756
2012- 1-17 2.48 0.756
2012- 1-17 18.62 0.756
2012- 1-18 10.76 0.756
2012- 1-19 2.90 0.756
2012- 1-19 19.04 0.756
2012- 1-20 11.18 0.756
2012- 1-21 3.32 0.756
2012- 1-21 19.46 0.756
2012- 1-22 11.60 0.756
2012- 1-23 3.74 0.756
2012- 1-23 19.88 0.756
2012- 1-24 12.02 0.756
2012- 1-25 4.16 0.756
2012- 1-25 20.30 0.756
2012- 1-26 12.44 0.756
2012- 1-27 4.58 0.756
2012- 1-27 20.72 0.756
2012- 1-28 12.86 0.756
2012- 1-29 5.00 0.756
2012- 1-29 21.14 0.756
2012- 1-30 13.28 0.756
2012- 1-31 5.42 0.756

Cheers, Petr [2012-01-07 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target during the 0.250 attenuation event (06:30 - 09:10 UT). Conditions were only fair with some light breeze but with high sky background levels due to proximity of the moon. [2012-01-04 14:42, Via Capote] Message sent to observers

· Started a run at 23:00 UT Jan 2. Forecast clear sky now turning cloudy.
Don [2012-01-03 02:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Began run with 32" in NC at 2330 UT under excellent conditions. Joe [2011-12-31 23:58, Dark Sky & PROMPT] Message sent to observers

· Observed by R.Inasaridze from 15:40 to 22:50 UT at Abastumani.

Yura [2011-12-31 02:56, Kharkiv]

· Started a run at 23:40 UT, Dec 26.
Don [2011-12-27 00:15, Sugarloaf] Message sent to BinAstPhotSurvey conference

· Started a run on this at 23:40 UT, Dec 24 under excellent conditions. Last night's run was ruined by clouds and wind.
Don [2011-12-25 00:25, Sugarloaf]

· I started a run at 02:10 UT in breezy conditions, hopefully, not too disruptive.
Don [2011-12-24 02:26, Sugarloaf] Message sent to BinAstPhotSurvey conference

· The weather is fine unexpectedly, but something is wrong with our telescope several nights, namely its guiding, and some minor things connected. I am trying to observe somehow, but I am not sure if this session is successfull. Adrian [2011-12-22 20:47, Modra] Message sent to observers

· Started a run at 00:25 UT.
Don [2011-12-19 00:40, Sugarloaf] Message sent to BinAstPhotSurvey conference

· The asteroid was observed from 16:20 up to 20:05 on 12/18 at Abastumani by Raguli Inasaridze. Yura [2011-12-19 01:05, Kharkiv] Message sent to observers

· Last night the asteroid was observed from 16:30 on 12/17 up to 3:30 on 12/18 at Abastumani (by R.Inasaridze). Yura [2011-12-18 14:53, Kharkiv]

· Began observing from NC at 0100 UT under good conditions. Hope to be able to continue until 1000 UT. Joe [2011-12-18 03:12, Dark Sky & PROMPT] Message sent to observers

· Observing this one from 20:50 UT in partly cloudy conditions... Best wishes, Kamil + student [2011-12-15 21:28, Ondrejov]

· Observed last night for 3 hours. Peter K. [2011-12-15 19:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Analysis to be finished after completing calibrations of Ondrejov data. [2009-05-06 08:11, Ondrejov]

· I did a run from 1:00 to 03:00 UT.
Don [2009-04-30 04:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· After a series of technical issues, I started a run at 01:20 UT. This is a good example of why you don't want to keep a sledge hammer in the observatory.
Don [2009-04-25 01:22, CarbuncleHill]

· Started at 00:46 UT in somewhat windy conditions.
Don [2009-04-24 01:59, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this at 00:40 UT.
Don [2009-04-17 00:43, CarbuncleHill]

· Kamil and Peter have observed this return NEA binary on three recent nights. They appearently captured events on all three nights (thanks to its P_orb = 16.14 h, i.e., ~2/3 day), but we haven't got sufficient data outside events to describe primary lc component to subtract it from the events data. Given that the nightly window here is only ~3.5 h long for the binary now and a significant part of it will be in event also during following nights, we ask for a help from another station on a different longitude (a couple hours different at least). Good quality data with errors not greater than 0.03 mag are needed. Many thanks in advance for your collaboration.
http://www.asu.cas.cz/~asteroid/1996fg3_09_porb.png

Clear Skies, Petr [2009-04-16 09:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will be observing this one from ~19:15 UT. Best wishes, Kamil [2009-04-15 18:42, Ondrejov] Message sent to observers

· I will be observing this one from ~19:45 UT. Best wishes, Kamil [2009-04-14 19:06, Ondrejov]

· I will try this one tonight. Best wishes, Kamil [2009-04-12 18:10, Ondrejov] Message sent to observers

· returning binary. observed from 10UT for 6 hours. event may be captured on the first hour. [2009-04-06 02:54, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(1573) Vaisala (Finished) - slow rotator [Add new note]
· Adrian et al. have completed this slow rotator:
http://www.asu.cas.cz/~asteroid/01573.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2012-01-12 15:16, Ondrejov]

· I added three short sessions for this target in previous three nights. It seems to be a tumbler with a long period of roughly 250 h, if my linkeages are right. Adrian [2011-10-01 20:22, Modra] Message sent to BinAstPhotSurvey conference

· After rainy and cloudy weather, sky is open since midnight, but this target is too close to a bright Moon. Not sure if the session is fine to continue. Adrian [2011-09-15 00:16, Modra]

· Observing it from 20:40 UT. Stefan [2011-09-13 22:28, Modra]

· Observing it from 20:31 UT. It looks having a longer period of some tens of hours. Between short evening and morning sessions I plan check the other bright target, (2423). Stefan [2011-09-12 21:08, Modra]

· Observing it again, from 20:47 UT. Stefan [2011-09-11 20:51, Modra]

· Observed whole last night. Jozef, Stefan [2011-09-11 17:27, Modra]

· Started this last night, got a steady decline of ~0.1mag in about 5h. We plan to do this again tonight and possibly tomorrow, if weather holds. Jozef, Stefan. [2011-09-10 12:44, Modra] Message sent to BinAstPhotSurvey conference

(2870) Haupt (Finished) - slow rotator [Add new note]
· Julian Oey worked this one from Leura on 14 nights, revealed it to be a slow rotator, U = 3- solution:
http://www.asu.cas.cz/~asteroid/02870.png
No obvious indication of tumbling, but the coverage is sparse so it is inconclusive re. its possible NPA state.

Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Julian.

Cheers, Petr [2011-12-16 10:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data taken on 10/29,11/01,11/05,11/14,11/18,11/28,12/02 indicated an even longer period of 274 +/- 1h. [2011-12-14 10:49, Blue Mountains Obs] Message sent to observers

· More data taken on 10/18,19/10,20/10,23/10 showing a bimodal light curve of period 98.7h and period of 0.4m. [2011-10-24 09:04, Blue Mountains Obs]

· Started new target taken over 2 nights on 10/09 and 10/16 show a long period object of >40h. [2011-10-17 02:23, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5327) 1989 EX1 (Finished) [Add new note]
· This one was well done by Don from Carbuncle Hill, Joe with PROMPT, and Julian from Leura: Unique solution, good coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/05327.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2011-12-14 06:05, Ondrejov]

· Began run from Prompt at 2320 UT. Hope to get ~7 hours again tonight. Joe [2011-07-26 00:58, Dark Sky & PROMPT] Message sent to observers

· observed on both 23rd and 24th for 3 and 6 hours respectively. Data is effected by cloud. [2011-07-25 10:21, Blue Mountains Obs]

· Began run from Prompt at 2320 UT. Hope to get ~7 hours. Will follow up with observations again tomorrow night. Joe [2011-07-24 23:49, Dark Sky & PROMPT] Message sent to observers

· observed for about 3 hours from 10.43UT 07/04. [2011-07-07 13:24, Blue Mountains Obs]

· Don Pray took three nights for this new target: a period around 8 hours and a high amplitude, but it needs to be nailed down with a couple or so nearby nights; Don's observations were separated by 14 and 7 days and the solution isn't unique. Don cannot observe it any more now so I encourage someone here to take over.
http://www.asu.cas.cz/~asteroid/05327.png

Clear Skies, Petr [2011-07-04 08:41, Ondrejov] Message sent to BinAstPhotSurvey conference

(3665) Fitzgerald (Finished) [Add new note]
· This "prime suspect" was done by Jim from Via Capote and by Don from his new observatory Sugarloaf Mountain (Welcome back, Don!) in its current 3rd apparition: Result in agreement with data from the previous apparitions, good coverage, no apparently significant deviation:
http://www.asu.cas.cz/~asteroid/03665_b1.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-12-08 15:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target under good conditions from 04:00 to 11:00 UT [2011-12-04 13:14, Via Capote] Message sent to observers

· observed this target under good conditions from 04:00 to 11:07UT Period of 2.414 no deviations so far [2011-12-03 14:04, Via Capote]

· Observed from Prompt under good conditions from 0100-0800 UT. Joe [2011-12-02 15:43, Dark Sky & PROMPT] Message sent to observers

· Began working this object under fair conditions 04:30 - 11:30UT [2011-11-28 14:29, Via Capote] Message sent to BinAstPhotSurvey conference

· Julian and Walt&John&Dirk have done this one from Leura and SRO on four and five nights, respectively, in its current 2nd apparition. Derived period is in a good agreement with data from 2006 June apparition, no deviation seen,
http://www.asu.cas.cz/~asteroid/03665_a7.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice to see that you, guys, have got very consistent data for the object from both stations. It was actually V=16.5 +/-0.3 (using the Ondrejov calibrations made in June 2006) during your observations, and you have got consistently rms residuals about 0.019 mag (Leura) and 0.012 mag (SRO). And it was at Dec=-16 deg, so not quite high in the sky from SRO. A simple extrapolation gives that Julian should be able to go V~17.0 with errors of 0.03 mag, while Walt, John and Dirk could go at least as deep as V~17.4 with 0.03-mag errors. So, objects as faint as V=17 and as south as Dec=-16 deg can be observed from more than one station in our network (as we and Skalnate Pleso as well as Kharkiv/Simeiz can go that deep as well, also a few other stations, so also objects too north for Julian can be covered from >1 station to V~17 with usable accuracy). So, in cases where we can predict object's V reasonably (not for new targets, which often have H's pretty off), we may plan to go that deep and south regularly.

Cheers, Petr [2007-11-07 16:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working again from SRO.

-Walt [2007-11-05 00:50, Sonoita]

· Working again from SRO.

-Walt [2007-11-03 02:26, Sonoita]

· Working tonight from SRO.

-Walt [2007-11-02 03:49, Sonoita] Message sent to BinAstPhotSurvey conference

· observed from 09:39UT to 12:34 UT 2007-10-21 cut short due to thick fog. [2007-10-21 21:12, Blue Mountains Obs] Message sent to observers

· observed from 12:29UT to 18:06 UT 2007-10-16 in good condition. [2007-10-17 01:02, Blue Mountains Obs]

· observed from 10:55UT and finished at 18:28UT 2007-10-13. light curve fit well to established period. [2007-10-15 02:40, Blue Mountains Obs] Message sent to observers

· Two good sessions by Julian from Leura and by Walt, John and Dirk from SRO combined. It agrees entirely with the 2.4141h period seen in the 2006 data. No significant deviation seen so far,
http://www.asu.cas.cz/~asteroid/03665_a7.png

Cheers, Petr [2007-10-08 11:14, Ondrejov] Message sent to observers

· Observed from 13:16UT to 18:41 UT2007-10-02. [2007-10-04 09:40, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

2000 SQ4 (Finished) [Add new note]
· This is a 2-period case, probable binary. Closing it. Petr [2011-12-07 14:08, Ondrejov]

· Observing tonight from 16:25 UT, in good conditions. Leos, Jozef. [2011-11-28 19:05, Modra]

· started observing this target at 02:45UT under fair conditions [2011-11-25 03:19, Via Capote] Message sent to observers

· observed from 04:15 to 10:00UT under good conditions [2011-11-23 14:51, Via Capote]

· Observing from 16:50 UT and will until weather allows. Peter K. [2011-11-22 18:47, Ondrejov] Message sent to observers

· observed under excellant conditions from 02:30 to 10:20 UT. Was not able to reduce the data yet but will do so later this evening and post any interesting results [2011-11-22 16:12, Via Capote]

· Brian Warner (lead) and I are collaborating on this project and we have collected additional data suggesting that there might be some event activity. For the next few days we are both going to be offline. If possible, additional linked observations of 0.02 mag precision or better would be very helpful for us to pin this down more completely. [2011-11-18 19:57, Via Capote] Message sent to BinAstPhotSurvey conference

· observed under fair conditions (passing clouds) from 0200 to 09:32UT [2011-11-18 14:48, Via Capote] Message sent to observers

· observed under good conditions from 02:30 to 10:30 UT [2011-11-17 13:33, Via Capote]

· observed under good conditions from 03:30 to 11:00 UT no deviations observed [2011-11-16 12:45, Via Capote] Message sent to observers

· started this YORP object under good conditions. Coverage over 1 complete lightcurve cycle. Period ~ 4.89hr [2011-11-14 12:59, Via Capote] Message sent to BinAstPhotSurvey conference

(23225) 2000 WD25 (Finished) [Add new note]
· Insufficient data for the BinAstPhotSurvey, closing it. Petr [2011-12-07 14:04, Ondrejov]

· Observed this target 2011 10 20 in reasonable conditions. Data reveals a period around 8.6hrs +/- 0.5hrs with an amplitude of 0.1mag +/- 0.02mag [2011-10-20 23:31, HuntersHill] Message sent to BinAstPhotSurvey conference

(17260) 2000 JQ58 (Finished) - return binary [Add new note]
· This one was done well from Ondrejov and Modra in its 3rd apparition.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-12-07 14:02, Ondrejov]

· Observing this one from 1:00 UT. Best wishes, Kamil [2011-10-22 23:20, Ondrejov] Message sent to observers

· Planning to observe tonight. Peter K. [2011-10-21 16:49, Ondrejov]

· Planning this one tonight, starting ~18:50UT. Jozef [2011-10-18 16:34, Modra]

· Planning to observe this one from the 18:50 UT. Jozef, Jiri. [2011-10-17 18:05, Modra]

· Observing from 20 UT under excellent conditions (again) and awaiting a morning event. Peter K. [2011-10-03 00:09, Ondrejov] Message sent to observers

· Peter K. and Kamil took one and half nights for this return binary from here in its current 3rd apparition now. (Petr S. has got a double solution for its orbit pole from modeling data of the first two apparitions.)
http://www.asu.cas.cz/~asteroid/17260_11_porb.png

Covering each of the two events twice in this as well as the next lunation will be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011-10- 1 20.04 0.250
2011-10- 2 10.79 0.250
2011-10- 3 1.55 0.250
2011-10- 3 16.31 0.250
2011-10- 4 7.06 0.250
2011-10- 4 21.82 0.250
2011-10- 5 12.58 0.250
2011-10- 6 3.34 0.250
2011-10- 6 18.09 0.250
2011-10- 7 8.85 0.250
2011-10- 7 23.61 0.250
2011-10- 8 14.36 0.250
2011-10-15 8.69 0.250
2011-10-15 23.45 0.250
2011-10-16 14.20 0.250
2011-10-17 4.96 0.250
2011-10-17 19.72 0.250
2011-10-18 10.48 0.250
2011-10-19 1.23 0.250
2011-10-19 15.99 0.250
2011-10-20 6.75 0.250
2011-10-20 21.50 0.250
2011-10-21 12.26 0.250
2011-10-22 3.02 0.250
2011-10-22 17.77 0.250
2011-10-23 8.53 0.250
2011-10-23 23.29 0.250
2011-10-24 14.05 0.250
2011-10-25 4.80 0.250
2011-10-25 19.56 0.250
2011-10-26 10.32 0.250
2011-10-27 1.07 0.250
2011-10-27 15.83 0.250
2011-10-28 6.59 0.250
2011-10-28 21.34 0.250
2011-10-29 12.10 0.250
2011-10-30 2.86 0.250
2011-10-30 17.62 0.250
2011-10-31 8.37 0.250
2011-10-31 23.13 0.250
2011-11- 1 13.89 0.250
2011-11- 2 4.64 0.250
2011-11- 2 19.40 0.250
2011-11- 3 10.16 0.250
2011-11- 4 0.91 0.250
2011-11- 4 15.67 0.250
2011-11- 5 6.43 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011-10- 2 3.38 0.748
2011-10- 2 18.14 0.748
2011-10- 3 8.89 0.748
2011-10- 3 23.65 0.748
2011-10- 4 14.41 0.748
2011-10- 5 5.16 0.748
2011-10- 5 19.92 0.748
2011-10- 6 10.68 0.748
2011-10- 7 1.44 0.748
2011-10- 7 16.19 0.748
2011-10- 8 6.95 0.748
2011-10- 8 21.71 0.748
2011-10-15 1.28 0.748
2011-10-15 16.03 0.748
2011-10-16 6.79 0.748
2011-10-16 21.55 0.748
2011-10-17 12.30 0.748
2011-10-18 3.06 0.748
2011-10-18 17.82 0.748
2011-10-19 8.58 0.748
2011-10-19 23.33 0.748
2011-10-20 14.09 0.748
2011-10-21 4.85 0.748
2011-10-21 19.60 0.748
2011-10-22 10.36 0.748
2011-10-23 1.12 0.748
2011-10-23 15.87 0.748
2011-10-24 6.63 0.748
2011-10-24 21.39 0.748
2011-10-25 12.15 0.748
2011-10-26 2.90 0.748
2011-10-26 17.66 0.748
2011-10-27 8.42 0.748
2011-10-27 23.17 0.748
2011-10-28 13.93 0.748
2011-10-29 4.69 0.748
2011-10-29 19.44 0.748
2011-10-30 10.20 0.748
2011-10-31 0.96 0.748
2011-10-31 15.72 0.748
2011-11- 1 6.47 0.748
2011-11- 1 21.23 0.748
2011-11- 2 11.99 0.748
2011-11- 3 2.74 0.748
2011-11- 3 17.50 0.748
2011-11- 4 8.26 0.748
2011-11- 4 23.01 0.748

Clear Skies, Petr [2011-10-01 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20 UT under excellent conditions. Peter K. [2011-09-30 20:26, Ondrejov] Message sent to observers

· Observing from Prompt starting at 0300 UT. Faint but thought it was worth a try. Joe [2011-09-29 05:34, Dark Sky & PROMPT]

· Re-starting this one and observing it for 3 hours after (10484) Hecht under excellent conditions. Best wishes, Kamil [2011-09-27 00:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· The 2nd apparition for the binary has been partially successful. Three long nights by Jim from Via Capote and four partial nights by Don from Carbuncle gave a good estimate for P_1 = 3.1288 +/- 0.0001 h (in agreement with the 2006 estimate), but relatively poor coverage of the orbital component. The data will be definitely useful for orbital modeling, but at least one more apparition will be needed.
http://www.asu.cas.cz/~asteroid/17260_09_p1.png
http://www.asu.cas.cz/~asteroid/17260_09_porb.png

Good work, Jim and Don.

Petr [2009-02-09 12:23, Ondrejov] Message sent to observers

· Started a run on this at 00:30.
Don [2009-02-01 00:50, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 23:00, Jan 29 UT.
Don [2009-01-29 23:25, CarbuncleHill]

· Started a run at 23:00. Clouds may interfere later.
Don [2009-01-27 00:10, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started a run at 23:15 UT in a rare break from unsettled weather.
Don [2009-01-15 23:14, CarbuncleHill]

· Observing from 17:30 UT in good conditions. Michal [2009-01-13 17:32, SkalnatePleso] [Remove]
Message sent to observers

· This target has now dropped below a usable magnitude for Via Capote. Data for three, 7 + hour runs have been submitted. No further measurements will be made on this target at Via Capote. [2009-01-04 14:16, Via Capote] Message sent to observers

· Began observing at 02:02 UT in fair conditions. Possible weather latter in the evening may shorten run. [2009-01-04 02:08, Via Capote] Message sent to BinAstPhotSurvey conference

· Began observing at 02:00 UT in good conditions [2009-01-02 02:04, Via Capote] Message sent to observers

· Began observing at 03:00 UT in good conditions [2009-01-01 03:23, Via Capote]

· I started this one at 22:25 UT. Best wishes, Kamil [2008-11-05 22:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· This binary has been done well in the past lunation. Follow-up observations would be useful only if their errors were not higher than 0.02 mag, that would be difficult to achieve during this lunation when it fainter, about V=16.5. So, we may close this one now.

Cheers, Petr [2006-03-16 16:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· The discovery announcement on this binary has been published on CBET 431. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
and I'm copying the text of the announcement here as well.

Cheers, Petr

(17260) 2000 JQ58
D. Higgins, Canberra, Australia; P. Pravec and P. Kusnirak,
Ondrejov Observatory; and A. Galad, S. Gajdos, J. Vilagi, and L.
Kornos, Modra Observatory, report that photometric observations
obtained during Jan. 29-Mar. 8 reveal that minor planet (17260) is
a binary system with an orbital period of 14.757 ± 0.003 hours.
The primary rotates with a period of 3.1287 ± 0.0001 hours, and
it has a light-curve amplitude of 0.15 mag. Mutual eclipse/
occultation events that are 0.07- to 0.13-mag deep indicate a
secondary-to-primary mean-diameter ratio of 0.26 ± 0.03.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 March 14 (CBET 431) Daniel W. E. Green [2006-03-15 08:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Very nice work on this binary. The current solution is:
Pprim= 3.1287 +/-0.0001 h
Porb= 14.757 +/-0.003 h
Aprim= 0.15 mag
Depth of the events: 0.07-0.13 mag
Ds/Dp= 0.26 +/-0.03
http://www.asu.cas.cz/~ppravec/17260_all.png
http://www.asu.cas.cz/~ppravec/17260_longpc.png
http://www.asu.cas.cz/~ppravec/17260_shortpc.png
The additional data covering the secondary event as well as other phases of the long period (so that the secondary's rotational lightcurve can be fitted better now) have improved an estimate for Ds/Dp. Porb has been slightly refined as well.

The discovery phase is over now, so we may announce it on CBET. I suggest David and Peter K. to prepare a draft of the discovery announcement, to circulate it among all collaborators, and to submit it if there is everything OK. Don't wait for me; I'll not be back at regular work before next Wednesday.

Cheers, Petr [2006-03-09 16:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 17260 from 09:38UT to 12:38 UT when cloud shut me down. Noisey data and now beyond my limit but I think it does cover phase 0.75 so the data may be of use.

Data has been sent to Peter and Petr [2006-03-08 21:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· Last dataset was joined in, see http://www.asu.cas.cz/~asteroid/17260.png. It is from Modra (2006-3-7.8) and cover the secondary event.

I'm not expecting more data due to near Moon. The discovery phase for this one is finished now and we are waiting for Petr's final analysis.

Thanks all for your collaborations!

Peter K. [2006-03-08 13:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 17260 from 09:41UT to 16:20UT. Target has reached my magnitude limit for 0.02/0.03 mag photometry. Not sure if I can offer much more but if conditions are clear tonight I will have another go at the second mutual event (but this will be my last opportunity) [2006-03-07 21:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· If the weather permits I'll try to observe it. The telescope points to the field. I;m going to start the run.

Adrian [2006-03-07 17:47, Modra]

· Three new datasets were joined in:
2006-3-5.5 by David Higgins at Hunters Hill Obs. (with part of primary event covered),
2006-3-5.9 by me at Ondrejov (with secondary event but heavily fragmented by clouds),
2006-3-6.5 by David Higgins at Hunters Hill Obs. (with secondary event but sparse coverage),
see: http://www.asu.cas.cz/~asteroid/17260.png

Even the secondary event has double coverage now it will be useful to cover it once more. Note, it is defined only with 9 points in David's last data. There are two last opportunities before the Moon will be too close (use Petr's ephemeris bellow). Good luck!

Peter [2006-03-07 13:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 17260 from 09:40 UT to 16:10 UT. Wind and occassional cloud but data seems OK. Data sent to Petr and Peter. [2006-03-06 21:07, HuntersHill]

· Observed 17260 from 09:51UT to 16:29UT. Cloud and fading magnitude made my data relatively noisy. [2006-03-05 22:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· New data observed by David Higgins (2006-3-4.5) were joined in, see: http://www.asu.cas.cz/~asteroid/17260.png

David covered the primary event. But what we still need is to observe the secondary event again (use the Petr's ephemeris bellow)!

There is a double coverage of sec. event visible in the new picture but please note times of observation. It was observed simultaneously at Modra and Ondrejov, only.

Peter K. [2006-03-05 11:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Commenced run at 9:55 UT. Average conditions and some cloud but expect to end session around 16:30 UT if the weather holds. [2006-03-05 10:18, HuntersHill]

· Completed run at 16:34 UT. Reasonably good data has been sent to Peter K and Petr. [2006-03-04 20:39, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced run at 09:30UT. No idea how it's going as the LAN connection to my observatory has failed - Hope it is just a LAN Card and not an indication of impending PC failure :-(

I am expecting the weather to hold for a full run. [2006-03-04 12:33, HuntersHill] Message sent to BinAstPhotSurvey conference

· Terminated session due to very bright field star in target path and vicinity [2006-03-03 10:43, HuntersHill]

· Started run at 10:00 UT. Not sure what the conditions may allow. [2006-03-03 10:19, HuntersHill] Message sent to BinAstPhotSurvey conference

· Session ended on ~21UT due to clouds :-(

Stefan/Jozef [2006-03-02 21:29, Modra]

· We started with it on Mar02 18:07UT. Hope in full covering of very needed secondary event, although one ~13mag star close encounter will happen.

Stefan/Jozef [2006-03-02 18:23, Modra] Message sent to BinAstPhotSurvey conference

· One night from Modra was joined in and fits well. They observed at same time as I did here so their data filled almost 2-hour long gap in my data (due to clouds).

Peter K. [2006-03-01 21:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in
2006-02-27.6 by David from Hunters Hill
2006-02-27.9 by Peter K. from here
Both caught an event (primary and secondary, respectively). The current solution by me and Peter K.:
Pprim= 3.1285 +/-0.0002 h
Porb= 14.755 +/-0.005 h
Aprim= 0.15 mag
Depth of the events: 0.11-0.16 mag
Ds/Dp= 0.32 +/-0.03
http://www.asu.cas.cz/~ppravec/17260_all.png
http://www.asu.cas.cz/~ppravec/17260_longpc.png
http://www.asu.cas.cz/~ppravec/17260_shortpc.png
Both periods appear unique, but Porb needs to be nailed down with one more event. The primary event is relatively well covered (a few times from 01-29.6 to 02-27.6, showing an evolution with changing geometry), but the secondary event has been covered just once. (Like the primary event, it must evolved - widened recently; both kind of events, occultation and eclipse, occur there.) So, one more good coverage of the secondary event will nail down both Porb and Ds/Dp. Then the discovery phase will be completed for this one and we will publish it. Ephemeris for the secondary event follows

Date/Time UTC (LTc.) Phase
--------------------------
2006- 3- 1 1.51 0.745
2006- 3- 1 16.26 0.745
2006- 3- 2 7.02 0.745
2006- 3- 2 21.77 0.745
2006- 3- 3 12.53 0.745
2006- 3- 4 3.28 0.745
2006- 3- 4 18.04 0.745
2006- 3- 5 8.79 0.745
2006- 3- 5 23.55 0.745
2006- 3- 6 14.30 0.745
2006- 3- 7 5.06 0.745
2006- 3- 7 19.81 0.745
2006- 3- 8 10.57 0.745

Send your new data to Peter K. (peter@asu.cas.cz) as he will serve as the joint data analyser here while I am away for the rest of the lunation.

Cheers, Petr [2006-02-28 12:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 10:00 UT. Except for the odd few clouds and one bad lot of scope pointing I got a full 7 hour run in. Average data has now been sent on to Petr [2006-02-27 21:22, HuntersHill]

· Observing from 19 UT but don't know what about weather later tonight. If it allow I will stay on this target till 1:30 UT. Peter K. [2006-02-27 20:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· New long (6.6 h) session of 2006-02-24.9 by Peter K. from here has shown a beginning of the event. A short (1.4 h) run by Adrian Galad from the same night (outside the event) joined in as well. The orbital period still cannot be derived uniquely (the events were detected at too distant times; a more concentrated effort covering them in a shorter time would be needed to get a unique solution faster), one of possible periods see
http://www.asu.cas.cz/~ppravec/17260_all.png
http://www.asu.cas.cz/~ppravec/17260_longpc.png
http://www.asu.cas.cz/~ppravec/17260_shortpc.png
I encourage all who can work this one with errors of 0.03 mag or better to help out with this one so that more events are detected and the orbital period can be derived uniquely.

Cheers, Petr [2006-02-27 10:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Attempting a run on this. Commenced 10:30UT. Conditions OK but not expected to last long. [2006-02-24 11:37, HuntersHill]

· New data joined in:
2006-02-17.8 by Stefan from Modra
2006-02-18.6 by David from Hunters Hill
The Modra run is just 1-hour long (limited by sky conditions) but the data are of a good quality and they contribute to the solution of the short period. (They are consistent with being taken outside of mutual events, but that needs to be confirmed with further data.) The David's run is a bit more noisy but it doesn't show any prominent mutual event as well. A preliminary solution (relatively secure in the short period with U=2+, but it may be wrong in the long period) see following pictures:
http://www.asu.cas.cz/~ppravec/17260_all.png
http://www.asu.cas.cz/~ppravec/17260_longpc.png
http://www.asu.cas.cz/~ppravec/17260_shortpc.png

Clearly, more data are needed to confirm and nail down it.

Cheers, Petr [2006-02-19 12:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Quite ordinary data in awkward conditions (hardware and weather issues) but I think it's still useable. Data sent to Petr. [2006-02-19 01:07, HuntersHill]

· Attempting a run on target but conditions are terrible. High humidity, wind and cloud and the best focus I can achieve is a FWHM of 5" [2006-02-18 11:27, HuntersHill] Message sent to BinAstPhotSurvey conference

· The three David's nights analyzed. As David suggested, it is a binary candidate. A tentative solution see following pictures:
http://www.asu.cas.cz/~ppravec/17260_all.png
http://www.asu.cas.cz/~ppravec/17260_longpc.png
http://www.asu.cas.cz/~ppravec/17260_shortpc.png
While the short period appears to be relatively secure (U=3-), the long period one is very uncertain and it may be wrong. More data, especially catching the events again need to be taken. I encourage others here to help out David when the Moon is out of the way.

Cheers, Petr [2006-02-14 10:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a clear night but the session was auto terminated early due to cloud. Data was less than ideal probably due to cloud and moon but at least It gave me 2 nights in a row - not that I can derive any sensible period out of it. Data sent to Petr. [2006-02-09 21:39, HuntersHill] Message sent to BinAstPhotSurvey conference

· Finally got a clear night and ran a session on (6084) BASCOM and (17260) 2000 JQ58. Though still early days I can see 2 overlapping plots centred on 3.28 hours or some pretty average data for a 4 peak curve centred on 6.561 hours. [2006-02-08 21:00, HuntersHill] Message sent to BinAstPhotSurvey conference

· Yes, it's really suspicious, but MORE DATA are needed to show what it really is, as discussed in the group. I encourage others to help out David with this one.

Clear Skies, Petr [2006-01-30 12:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Well the clouds came then they went so I left the observatory open. I got around 6 hours of data and the reduced results are wierd. There appears to be a distinct bimodal period around 3 hours with an amplitude over 0.3mag BUT I'm going to re-measure everything.

Here's the plot - re-measured twice. I don't have a huge option of comp stars but I might have another go measuring it again later.

http://www.david-higgins.com/17260LC.gif [2006-01-29 21:48, HuntersHill] Message sent to BinAstPhotSurvey conference

(4029) Bridges (Finished) - return binary [Add new note]
· Observations were taken for this binary in its 4th apparition from Ondrejov, Modra and Prompt:
http://www.asu.cas.cz/~asteroid/04029_1109_p1.png
http://www.asu.cas.cz/~asteroid/04029_1109_porb.png
http://www.asu.cas.cz/~asteroid/04029_1110_p1.png
http://www.asu.cas.cz/~asteroid/04029_1110_porb.png
They are consistent with our results from the first three apparitions and they will allow us to refine its model.

Cheers, Petr [2011-12-07 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· It would be good to take last coverage for both events for this apparition, errors < 0.03 mag needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011-11-14 11.46 0.248
2011-11-15 3.77 0.248
2011-11-15 20.08 0.248
2011-11-16 12.39 0.248
2011-11-17 4.70 0.248
2011-11-17 21.01 0.248
2011-11-18 13.32 0.248
2011-11-19 5.63 0.248
2011-11-19 21.94 0.248
2011-11-20 14.25 0.248
2011-11-21 6.56 0.248
2011-11-21 22.87 0.248
2011-11-22 15.18 0.248
2011-11-23 7.49 0.248
2011-11-23 23.80 0.248
2011-11-24 16.11 0.248
2011-11-25 8.42 0.248
2011-11-26 0.73 0.248
2011-11-26 17.04 0.248
2011-11-27 9.35 0.248
2011-11-28 1.66 0.248
2011-11-28 17.97 0.248
2011-11-29 10.28 0.248
2011-11-30 2.59 0.248
2011-11-30 18.90 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2011-11-14 3.30 0.748
2011-11-14 19.61 0.748
2011-11-15 11.92 0.748
2011-11-16 4.23 0.748
2011-11-16 20.54 0.748
2011-11-17 12.85 0.748
2011-11-18 5.16 0.748
2011-11-18 21.47 0.748
2011-11-19 13.78 0.748
2011-11-20 6.09 0.748
2011-11-20 22.40 0.748
2011-11-21 14.71 0.748
2011-11-22 7.02 0.748
2011-11-22 23.33 0.748
2011-11-23 15.64 0.748
2011-11-24 7.95 0.748
2011-11-25 0.26 0.748
2011-11-25 16.57 0.748
2011-11-26 8.88 0.748
2011-11-27 1.19 0.748
2011-11-27 17.50 0.748
2011-11-28 9.81 0.748
2011-11-29 2.12 0.748
2011-11-29 18.43 0.748
2011-11-30 10.74 0.748

Clear Skies, Petr [2011-11-07 15:56, Ondrejov]

· Planing to observe this one from 17:10 UT to 22:45 UT - should cover secondary event, if weather hold. Best wishes, Kamil [2011-10-31 17:07, Ondrejov] Message sent to observers

· Started run from Prompt at 0130 UT. Hope to cover phase 0.270 event at 0353 UT. Joe [2011-10-29 01:57, Dark Sky & PROMPT]

· Observing from 17:45 UT. Peter K. [2011-10-17 18:57, Ondrejov] Message sent to observers

· Observing from 18 UT and should cover 0.25-phase event. Sky is very good but Moon could be a problem. Peter K. [2011-10-16 18:19, Ondrejov]

· Six nights for this return binary by Stefan, Jozef and Adrian from Modra, Kamil from here, and Joe with Prompt have done this one sufficiently for this lunation:
http://www.asu.cas.cz/~asteroid/04029_11_porb.png
http://www.asu.cas.cz/~asteroid/04029_11_p1.png
Good work, guys.

More observations (with errors < 0.03 mag) in the next lunation would be useful; events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011-10-15 13.69 0.270
2011-10-16 6.00 0.270
2011-10-16 22.31 0.270
2011-10-17 14.62 0.270
2011-10-18 6.93 0.270
2011-10-18 23.24 0.270
2011-10-19 15.55 0.270
2011-10-20 7.86 0.270
2011-10-21 0.17 0.270
2011-10-21 16.48 0.270
2011-10-22 8.79 0.270
2011-10-23 1.10 0.270
2011-10-23 17.41 0.270
2011-10-24 9.72 0.270
2011-10-25 2.03 0.270
2011-10-25 18.34 0.270
2011-10-26 10.65 0.270
2011-10-27 2.96 0.270
2011-10-27 19.27 0.270
2011-10-28 11.58 0.270
2011-10-29 3.89 0.270
2011-10-29 20.20 0.270
2011-10-30 12.51 0.270
2011-10-31 4.82 0.270
2011-10-31 21.13 0.270
2011-11- 1 13.44 0.270
2011-11- 2 5.75 0.270
2011-11- 2 22.06 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2011-10-15 5.38 0.760
2011-10-15 21.69 0.760
2011-10-16 14.00 0.760
2011-10-17 6.31 0.760
2011-10-17 22.62 0.760
2011-10-18 14.93 0.760
2011-10-19 7.24 0.760
2011-10-19 23.55 0.760
2011-10-20 15.86 0.760
2011-10-21 8.17 0.760
2011-10-22 0.48 0.760
2011-10-22 16.79 0.760
2011-10-23 9.10 0.760
2011-10-24 1.41 0.760
2011-10-24 17.72 0.760
2011-10-25 10.03 0.760
2011-10-26 2.34 0.760
2011-10-26 18.65 0.760
2011-10-27 10.96 0.760
2011-10-28 3.27 0.760
2011-10-28 19.58 0.760
2011-10-29 11.89 0.760
2011-10-30 4.20 0.760
2011-10-30 20.51 0.760
2011-10-31 12.82 0.760
2011-11- 1 5.13 0.760
2011-11- 1 21.44 0.760
2011-11- 2 13.75 0.760
2011-11- 3 6.06 0.760

Clear Skies, Petr [2011-09-28 16:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· I forgot to mention I continue with this tonight. Adrian [2011-09-27 22:49, Modra] Message sent to observers

· Observing it from 19:20 UT. Stefan [2011-09-26 21:40, Modra]

· Observing it from 18:58 UT. Stefan [2011-09-25 19:09, Modra]

· First data for this binary in its current 4th apparition taken by Kamil from here, a solution with the periods fixed at the estimates from the previous apparitions:
http://www.asu.cas.cz/~asteroid/04029_11_porb.png

More data for both events are needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 9-25 20.69 0.253
2011- 9-26 13.01 0.253
2011- 9-27 5.33 0.253
2011- 9-27 21.65 0.253
2011- 9-28 13.97 0.253
2011- 9-29 6.29 0.253
2011- 9-29 22.61 0.253
2011- 9-30 14.93 0.253
2011-10- 1 7.25 0.253
2011-10- 1 23.57 0.253
2011-10- 2 15.89 0.253
2011-10- 3 8.21 0.253
2011-10- 4 0.53 0.253
2011-10- 4 16.85 0.253
2011-10- 5 9.17 0.253
2011-10- 6 1.49 0.253
2011-10- 6 17.81 0.253
2011-10- 7 10.13 0.253

Date/Time UTC (LTc.) Phase
--------------------------
2011- 9-26 4.80 0.750
2011- 9-26 21.12 0.750
2011- 9-27 13.44 0.750
2011- 9-28 5.76 0.750
2011- 9-28 22.08 0.750
2011- 9-29 14.40 0.750
2011- 9-30 6.72 0.750
2011- 9-30 23.04 0.750
2011-10- 1 15.36 0.750
2011-10- 2 7.68 0.750
2011-10- 2 24.00 0.750
2011-10- 3 16.32 0.750
2011-10- 4 8.64 0.750
2011-10- 5 0.96 0.750
2011-10- 5 17.28 0.750
2011-10- 6 9.60 0.750
2011-10- 7 1.92 0.750

Clear Skies, Petr [2011-09-25 16:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to start this one shortly, in good conditions. Jozef, Stefan [2011-09-24 18:50, Modra]

· Began observing from Prompt at 0010 UT. Hope to add to Kamil's observations out to ~0800 UT. Joe [2011-09-24 00:25, Dark Sky & PROMPT] Message sent to observers

· Started this one at 19:15 UT and expecting 7hr long run. Best wishes, Kamil [2011-09-23 21:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Done in the 3rd apparition:
http://www.asu.cas.cz/~asteroid/04029_1005_p1.png
http://www.asu.cas.cz/~asteroid/04029_1005_porb.png
http://www.asu.cas.cz/~asteroid/04029_1006_p1.png
http://www.asu.cas.cz/~asteroid/04029_1006_porb.png
Note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great work, guys.

Cheers, Petr [2010-06-24 13:19, Ondrejov]

· Began observing at 0140 UT 06/07-08/2010 under excellent conditions. Hope to cover the 0.750 phase event centered at 0520 UT tonight. Joe [2010-06-08 02:16, Dark Sky & PROMPT] Message sent to observers

· Began observing at 2330 UT 06/03-04/2010 under excellent conditions. Hope to cover the 0.750 phase event centered at 0329 UT tonight. Joe [2010-06-04 00:08, Dark Sky & PROMPT]

· To finish this one for this apparition, completing coverage of the 0.75-phase event is needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 5-31 9.70 0.245
2010- 6- 1 2.01 0.245
2010- 6- 1 18.32 0.245
2010- 6- 2 10.63 0.245
2010- 6- 3 2.94 0.245
2010- 6- 3 19.25 0.245
2010- 6- 4 11.56 0.245
2010- 6- 5 3.87 0.245
2010- 6- 5 20.18 0.245
2010- 6- 6 12.49 0.245
2010- 6- 7 4.80 0.245
2010- 6- 7 21.11 0.245
2010- 6- 8 13.42 0.245
2010- 6- 9 5.73 0.245
2010- 6- 9 22.04 0.245
2010- 6-10 14.35 0.245
2010- 6-11 6.66 0.245
2010- 6-11 22.97 0.245
2010- 6-12 15.28 0.245
2010- 6-13 7.59 0.245
2010- 6-13 23.90 0.245
2010- 6-14 16.21 0.245
2010- 6-15 8.52 0.245
2010- 6-16 0.83 0.245
2010- 6-16 17.14 0.245
2010- 6-17 9.45 0.245
2010- 6-18 1.76 0.245
2010- 6-18 18.07 0.245
2010- 6-19 10.38 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2010- 5-31 1.62 0.750
2010- 5-31 17.93 0.750
2010- 6- 1 10.24 0.750
2010- 6- 2 2.55 0.750
2010- 6- 2 18.86 0.750
2010- 6- 3 11.17 0.750
2010- 6- 4 3.48 0.750
2010- 6- 4 19.79 0.750
2010- 6- 5 12.10 0.750
2010- 6- 6 4.41 0.750
2010- 6- 6 20.72 0.750
2010- 6- 7 13.03 0.750
2010- 6- 8 5.34 0.750
2010- 6- 8 21.65 0.750
2010- 6- 9 13.96 0.750
2010- 6-10 6.27 0.750
2010- 6-10 22.58 0.750
2010- 6-11 14.89 0.750
2010- 6-12 7.20 0.750
2010- 6-12 23.51 0.750
2010- 6-13 15.82 0.750
2010- 6-14 8.13 0.750
2010- 6-15 0.44 0.750
2010- 6-15 16.75 0.750
2010- 6-16 9.06 0.750
2010- 6-17 1.37 0.750
2010- 6-17 17.68 0.750
2010- 6-18 9.99 0.750
2010- 6-19 2.30 0.750

Clear Skies, Petr [2010-05-28 11:34, Ondrejov]

· David has got great data for this return binary in its current apparition from Hunters Hill on four nights 2010-05-08 to 12:
http://www.asu.cas.cz/~asteroid/04029_10_porb.png
http://www.asu.cas.cz/~asteroid/04029_10_p1.png
They are in perfect agreement with results from the previous two apparitions. A couple more nights covering the 0.75-phase event should establish it well for now. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 5-13 17.64 0.245
2010- 5-14 9.95 0.245
2010- 5-15 2.26 0.245
2010- 5-15 18.57 0.245
2010- 5-16 10.88 0.245
2010- 5-17 3.19 0.245
2010- 5-17 19.50 0.245
2010- 5-18 11.81 0.245
2010- 5-19 4.12 0.245
2010- 5-19 20.43 0.245
2010- 5-20 12.74 0.245
2010- 5-21 5.05 0.245
2010- 5-21 21.36 0.245
2010- 5-22 13.67 0.245
2010- 5-23 5.98 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2010- 5-14 1.84 0.748
2010- 5-14 18.15 0.748
2010- 5-15 10.46 0.748
2010- 5-16 2.77 0.748
2010- 5-16 19.08 0.748
2010- 5-17 11.39 0.748
2010- 5-18 3.70 0.748
2010- 5-18 20.01 0.748
2010- 5-19 12.32 0.748
2010- 5-20 4.63 0.748
2010- 5-20 20.94 0.748
2010- 5-21 13.25 0.748
2010- 5-22 5.56 0.748
2010- 5-22 21.87 0.748

Clear Skies, Petr [2010-05-13 13:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· This binary has been observed in its 2nd apparition by Don from Carbuncle Hill (5 nights), by Peter and Kamil from here (3 nights), and by Michal and Marek from S. Pleso (1 night). The data give
P_orb = 16.31 +/- 0.02 h
P_1 = 3.5752 +/- 0.0001 h
that agree with estimates from the 2006 discovery apparition
(16.31 ± 0.01 and 3.5746 ± 0.0001 h, respectively; Higgins et al. 2006, CBET 507) to within a few sigma. Events in the current apparition were, however, deeper than in the discovery apparition, indicating that we have not seen total events in 2006 and that our estimate for D_2/D_1 published on CBET 507 has been underestimated. Indeed, a check of the 2006 data shows that the two sessions that covered the secondary event well (2006-04-27.7 and 05-04.6, both by David from Hunters Hill) have not shown an entirely flat bottom. We cannot tell whether events seen in the current 2007 apparition have been already total, because of a lower quality of data obtained for the faint asteroid in the current apparition. So, depth of events observed on 2007-10-15.8 and 11-01.8 (both by Peter&Kamil from Ondrejov) gives a lower limit on D_2/D_1 of 0.32.
http://www.asu.cas.cz/~asteroid/04029_a7_all.png
http://www.asu.cas.cz/~asteroid/04029_a7_porb.png
http://www.asu.cas.cz/~asteroid/04029_a7_porb_contacts.png
http://www.asu.cas.cz/~asteroid/04029_a7_p1.png
cf. with
http://www.asu.cas.cz/~asteroid/4029_longpc.png

The current apparition for the binary is effectively over now. I'm going to put summary results for the binary on
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
so that I can refer to it in a next update of the binary parameters database
http://www.asu.cas.cz/~asteroid/binastdata.htm
that I plan to do after we complete and announce currently worked binaries (including the latest one, Brian's 1453 Fennia).

Cheers, Petr [2007-11-20 15:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 22:35, Nov 13, to catch the .75 phase event at 2.09 UT [2007-11-13 22:38, CarbuncleHill]

· Started at 23:35, Nov 11 UT. I should catch the secondary event at 1.16ut if my ephemeris generator is working correctly.
Don [2007-11-11 23:46, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I got 3.3 hours of data, the last half hour is at airmass greater then 2. But the quick look shows that I probably got it. I will send the reduced data to Petr soon.

Judit [2007-11-08 23:17, McDonald Observatory] Message sent to observers

· I will try catch as much as possible of the .755 phase event before it sets. I started at 4:25 UT.

Judit [2007-11-08 00:29, McDonald Observatory]

· Observing from 17:30 UT. Peter K. [2007-11-01 21:00, Ondrejov] Message sent to observers

· For this binary, we still need one more good session especially for the secondary event. According to Peter&Kamil's calibrated data of 2007-10-14 and 15, the asteroid has H_R = 12.40 +/- 0.1 (assuming G=0.15 +/- 0.2), so it will be R~16.9 (V~17.3) after the full moon. It should still allow us to take good data to confirm the current event depth and evolution.

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-29 2.65 0.245
2007-10-29 18.96 0.245
2007-10-30 11.27 0.245
2007-10-31 3.58 0.245
2007-10-31 19.89 0.245
2007-11- 1 12.20 0.245
2007-11- 2 4.51 0.245
2007-11- 2 20.82 0.245
2007-11- 3 13.13 0.245
2007-11- 4 5.44 0.245
2007-11- 4 21.75 0.245
2007-11- 5 14.06 0.245
2007-11- 6 6.37 0.245
2007-11- 6 22.68 0.245
2007-11- 7 14.99 0.245
2007-11- 8 7.30 0.245
2007-11- 8 23.61 0.245

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-29 10.96 0.755
2007-10-30 3.27 0.755
2007-10-30 19.58 0.755
2007-10-31 11.89 0.755
2007-11- 1 4.20 0.755
2007-11- 1 20.51 0.755
2007-11- 2 12.82 0.755
2007-11- 3 5.13 0.755
2007-11- 3 21.44 0.755
2007-11- 4 13.75 0.755
2007-11- 5 6.06 0.755
2007-11- 5 22.37 0.755
2007-11- 6 14.68 0.755
2007-11- 7 6.99 0.755
2007-11- 7 23.30 0.755
2007-11- 8 15.61 0.755
2007-11- 9 7.92 0.755

Cheers, Petr [2007-10-23 08:25, Ondrejov] Message sent to observers

· Started at 23:45, Oct 16 UT.
Don [2007-10-16 23:42, CarbuncleHill]

· Observing from 17:25 UT in good conditions. Expecting a long session. Michal [2007-10-16 17:28, SkalnatePleso] [Remove]
Message sent to observers

· Three nights 2007-10-05.1, 6.0, and 14.1 by Don from Carbuncle Hill and two nights 2007-10-14.9 and 15.9 by Peter and Kamil from here have shown that there occur events in the binary in this apparition. P_1 and P_orb are in agreement (to 2 sigma) with their estimates from 2006. The primary event has been covered nearly ok (though its apparent evolution from Oct. 6.0 to 14.9 would deserve to be further monitored), but the secondary event needs to be covered again; its depth of 0.10 mag on Oct. 15.8 is deeper than predicted from the 2006 data. If it is confirmed with another session, it will indicate that D_2/D_1 is slightly greater than estimated from the 2006 data. Ephemeris for events below.
http://www.asu.cas.cz/~asteroid/04029_a7_all.png
http://www.asu.cas.cz/~asteroid/04029_a7_porb.png
http://www.asu.cas.cz/~asteroid/04029_a7_p1.png

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-16 21.12 0.248
2007-10-17 13.43 0.248
2007-10-18 5.74 0.248
2007-10-18 22.05 0.248
2007-10-19 14.36 0.248
2007-10-20 6.67 0.248
2007-10-20 22.98 0.248
2007-10-21 15.29 0.248

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-16 12.91 0.745
2007-10-17 5.22 0.745
2007-10-17 21.53 0.745
2007-10-18 13.84 0.745
2007-10-19 6.15 0.745
2007-10-19 22.46 0.745
2007-10-20 14.77 0.745
2007-10-21 7.08 0.745

Clear Skies, Petr [2007-10-16 09:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· At 17:50 UT we started this one. We should be able to catch the event. Kamil + Peter K. + Petr S. [2007-10-15 18:21, Ondrejov] Message sent to observers

· Planning to observe it tonight (as a main target). Peter K. + Kamil [2007-10-14 18:01, Ondrejov]

· I started this at 00:00, Oct. 14UT. Conditions are good now, and will hopefully stay that way.
Don [2007-10-14 00:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Well, I started a thread for 4025 Bridges rather than the correct name of 4029 Bridges. I trust someone can remove the incorrect entry?

I observed it for a couple hours on Oct 5 UT, but fog closed me down.

I started again on Oct 6 at ~00:05UT with fog in the forecast. It's worth a try.

Don [2007-10-06 00:22, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(1536) Pielinen (Finished) - slow rotator [Add new note]
· This slow rotator was done by Russ Durkee and by Walt Cooney et al. on 15 nights (plus two additional relative nights). In this case, fortunately, they took longer series of nights linked in their internal systems and also the asteroid showed more prominent deviations, so we could establish it as being a tumbler. A solution for the second period is a little bit weak and it is also sensitive on accuracy of the calibrations and a difference between the zero points of their internal systems, so it is PAR = -2.
http://www.asu.cas.cz/~asteroid/01536.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very good work, guys.

Cheers, Petr [2011-12-03 06:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Conditions look very good here tonight. Looks like SRO may cloud out early. So I will also cover this one tonight.

Russ [2011-11-29 02:30, Shed of Science] Message sent to observers

· Working from SRO tonight. -Walt [2011-11-28 03:01, Sonoita]

· Started a run at 01:45 UT from SRO tonight. -Walt [2011-11-17 01:42, Sonoita]

· Started a run at about 02:45 UT from SRO tonight. -Walt [2011-11-16 03:19, Sonoita] Message sent to observers

· Started under partly cloudy conditions.

Russ [2011-10-28 03:48, Shed of Science]

· Started under good conditions.

Russ [2011-10-24 01:31, Shed of Science] Message sent to observers

· Starting another run on this one under good conditions.

Russ [2011-10-06 02:29, Shed of Science]

· Results from the last two nights show a longer period greater than 22 hrs and amplitude greater than 0.4mag.

Russ [2011-10-05 03:29, Shed of Science] Message sent to observers

· Started on this object tonight, but it may become partly cloudy before morning.

Russ [2011-10-04 02:55, Shed of Science]

· Started on this new object under very good conditions. Should be able to follow for about 7 hours.

Russ [2011-10-01 02:07, Shed of Science] Message sent to BinAstPhotSurvey conference

(2423) Ibarruri (Finished) - slow rotator [Add new note]
· This one has been worked by Russ Durkee, Vasilij Chiorny and Adrian Galad on 14 nights (12 of them were internally calibrated in 4 different systems!). A unique period solution, though a check of possible NPA rotation couldn't be really done with the heterogeneously calibrated data, so it is PAR = 0.
http://www.asu.cas.cz/~asteroid/02423.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the tough target.

Cheers, Petr [2011-12-03 06:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started on this one tonight.

Russ [2011-11-29 02:26, Shed of Science] Message sent to observers

· Started on this tonight under partly cloudy skies.

Russ [2011-10-28 03:48, Shed of Science]

· Started on this one tonight.

Russ [2011-10-24 01:32, Shed of Science] Message sent to observers

· Starting on this object tonight under good conditions.

Russ [2011-10-06 02:29, Shed of Science]

· Started on this again tonight, may become partly cloudy by morning though.

Russ [2011-10-04 02:56, Shed of Science] Message sent to observers

· In fact, this target was observed from Modra as well, so I continued with it this week. I am not sure, but it may be a tumbler, though its period is probably roughly 140 h. I need to do linkages. Adrian [2011-10-01 20:29, Modra] Message sent to BinAstPhotSurvey conference

· I will be starting on this new target shortly and should be able to follow it for about 7 hrs.

Russ [2011-10-01 02:13, Shed of Science]

(138852) 2000 WN10 (Finished) - YORP target and Earth co-orbital [Add new note]
· Peter K., Kamil and Jan Vrastil observed this YORP target and Earth co-orbital from Ondrejov on two nights:
http://www.asu.cas.cz/~asteroid/138852.png

This is sufficient data for this one for the NEOSource project in this year. Well done, guys.

Cheers, Petr [2011-11-23 06:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:50 UT as a complementary target for (25884) 2000 SQ4. Peter K. [2011-11-22 18:48, Ondrejov] Message sent to observers

· Covered more than one full period last night. The data should be sufficient for this one. Best wishes, Kamil and Honza [2011-11-20 12:10, Ondrejov] Message sent to BinAstPhotSurvey conference

(5044) Shestaka (Finished) [Add new note]
· This new target has been worked from Modra on two full and four partial nights: U = 3- solution, good coverage, no prominent deviation,
http://www.asu.cas.cz/~asteroid/05044.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2011-11-21 16:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night under intense moonlite and haze, in R-filter, from 18:24 to 03:43 UT. Data with questionable quality will be available later.
Stefan [2011-11-09 17:08, Modra]

· Observing it from 18:03 UT under cirrus clouds and moonlite. Stefan [2011-11-06 18:08, Modra]

· Observing tonight from ~20:10 UT in unstable conditions. Jozef, Stefan. [2011-11-05 20:24, Modra]

· Observed 31.10/1.11. Some periodic feature is noticed but an assessment of the period is not possible yet. Jozef, Leos [2011-11-05 11:44, Modra] Message sent to BinAstPhotSurvey conference

(1820) Lohmann (Finished) [Add new note]
· This new slowish rotator was done by David from Hunters Hill and by Walt, John and Dirk from Sonoita, 12 linked nights in total:
http://www.asu.cas.cz/~asteroid/01820.png
http://www.asu.cas.cz/~asteroid/01820_a.png
The linkages are consistent to about +/-0.01 mag, very good. Target closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2011-10-24 10:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Worked this asteroid on Oct 18, 20, 22, and 23 UT from SRO. Data sent to Petr and Peter just now. [2011-10-24 01:09, Sonoita] Message sent to observers

· Observed 2011 09 16 through 2011 09 18 in varying conditions. Data revelas a period of 14.0490h +/- 0.0005h with an amplitude of 0.4mag +/- 0.02mag. No deviations detected. [2011-10-19 21:33, HuntersHill]

· Observed target 20110802 in reasonable conditions. Data reveals a period of 14.03h or 12.81h. More dtaa needed to resolve the period. No deviations detected. [2011-09-06 00:18, HuntersHill] Message sent to observers

· Observed 20110830 from 11:14UT to 19:13UT in reasonable conditions. Data reveals a period of around 13.9h +/- 0.1h with an amplitude of 0.4mag +/- 0.01mag. No deviations detected. [2011-08-30 22:24, HuntersHill] Message sent to BinAstPhotSurvey conference

(1077) Campanula (Finished) [Add new note]
· This one was done well by David Higgins on three nights: Unique solution, good coverage, no deviation:
http://www.david-higgins.com/Astronomy/asteroid/results/output/1077.htm
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David.

Cheers, Petr [2011-10-20 11:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2011 10 17 through 2011 10 19. Data releals a period of 3.847h +/- 0.002h with an amplitude of 0.4mag +/- 0.02mag. No deviations noted. Data sent to Petr and Peter K [2011-10-19 21:30, HuntersHill] Message sent to BinAstPhotSurvey conference

(25037) 1998 QC37 (Finished) [Add new note]
· Unsuccessfull. Petr [2011-10-14 08:09, Ondrejov]

· Trying this one tonight, from 18:10 UT. Peter K. [2011-10-01 19:07, Ondrejov] Message sent to observers

· observed for the past 2 nights (08/26 and 08/27). Data was somewhat noisy and unable to determine accurately the period. More data will be taken tonight 08/28, hope this will clear up some "peculiarities". [2011-08-28 09:53, Blue Mountains Obs] Message sent to observers

· Started observation tonight from about 10UT 08/25. Expect full night of about 8h long. Conditon is good. [2011-08-25 11:36, Blue Mountains Obs]

· Leos Kornos observed this new target from Modra on the past two nights. His linked data reveal a low amplitude, short to moderate period lightcurve. One of several possible solutions:
http://www.asu.cas.cz/~asteroid/25037.png

The conditions for observations of this target are rather difficult at Modra during these nights: The current heat wave allows them to cool the CCD to only -20 C, and the object is relatively low in the sky for them. Leos doesn't think that the conditions will allow them to get a good quality data for at least a few following nights. We thus ask for a help with this target. If you can work the asteroid with errors < 0.02 mag, your observations would be welcome.

Clear Skies, Petr [2011-08-24 12:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Object observed in 22/23.8 and 23/24.8. Leos [2011-08-24 11:42, Modra]

(20932) 2258 T-1 (Finished) [Add new note]
· This bright one is finished after 2 nights from here and another one from Prompt - period is unique, no deviations in LC and has sufficient coverage.

http://www.asu.cas.cz/~asteroid/20932.png

Peter K. [2011-10-04 11:49, Ondrejov] Message sent to observers

· Observing this one from 19:55 UT. Best wishes, Kamil [2011-10-03 19:59, Ondrejov]

· Observed for 6 hours last night. Data revealed period of 4.3 h and amplitude 0.17 mag. Peter K. [2011-09-30 08:55, Ondrejov] Message sent to observers

(39991) 1998 HR37 (Finished) - member of a cluster [Add new note]
· Two good nights for this (largest) member of a cluster ("mini-family") taken by Marek and Gabo from Skalnate Pleso: Unique solution, good coverage, no deviation:
http://www.asu.cas.cz/~asteroid/39991.png

These initial data for this one are sufficient for a study by David Vokrouhlicky for now. Put to our page with summary results:
http://www.asu.cas.cz/~ppravec/newres.htm

Good work, guys.

Cheers, Petr [2011-09-28 11:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Today in my program. Gabo [2011-09-27 14:23, SkalnatePleso] [Remove]
Message sent to observers

· Observed on Aug. 26. Covered more than 5 hours. The first period estimate is at 3.4 hr, amplitude 0.36 mag.
Next attempt to complete this one could be in this night.
Marek and Gabo [2011-09-27 11:51, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

2011 EZ78 (Finished) - binary suspect [Add new note]
· This binary suspect remains unconfirmed, see details under the link at
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2011-09-08 14:10, Ondrejov]

· One more session 11/12.6.2011. Leos [2011-06-15 17:40, Modra]

· This NEA binary suspect has been worked from Modra on 11 nights, supported with one night from La Hita and one night from Ondrejov. Two suspect attenuations seen: the one on 05-26.9, and a possible emerge from an event after the beginning of the 06-10.9 night (but Adrian is not sure the first few points of the nights are precise). The data folded with the primary period, split in three intervals because of evolving lightcurve:
http://www.asu.cas.cz/~asteroid/2011ez78_110521_26.png
http://www.asu.cas.cz/~asteroid/2011ez78_110529_31.png
http://www.asu.cas.cz/~asteroid/2011ez78_110610_13.png

Our analysis of additional dataset by Brian Skiff from Lowell showed numerous deviations in his data which we suspect are residual artifacts of interferences with background stars. Brian is going to attempt to re-reduce them to avoid contaminations with field stars.

This suspect remains unconfirmed.

Petr [2011-06-13 13:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21:15 UT under variable conditions. Peter K. [2011-06-12 22:36, Ondrejov] Message sent to observers

· I could join the effort tonight. Adrian [2011-06-10 19:57, Modra]

· BTW: Brian Skiff sent a note about this object, on mpml post. He mentioned a longer period (two times) and some other interesting things (tumbler). Stefan [2011-06-06 23:40, Modra] Message sent to BinAstPhotSurvey conference

· Started from 19UT to 00UT under good weather. Yura [2011-06-01 01:00, Kharkiv] Message sent to observers

· Started tonight from 20:20UT, good conditions expected. Jozef, Peter. [2011-05-30 20:21, Modra]

· This Amor was observed on six nights by Stefan Gajdos, Jozef Vilagi and Peter Veres from Modra, supported with one night from La Hita. Most of the data fit well together with a period of 3.116 h, but one session shows a drop by 0.13 mag that may be a mutual event. See
http://www.asu.cas.cz/~asteroid/2011ez78.png
where the attenuated points are x-ed.

I encourage northern hemisphere observers to help out to confirm this binary suspect.

Clear Skies, Petr [2011-05-30 13:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:30 UT with high altitute clouds. Peter [2011-05-29 20:59, Modra] Message sent to observers

· Observing from 22:00 UT, weather is changing fast. [2011-05-28 21:57, Modra]

· Starting at 21:00, object quite faint. Clear night but windy....reasonable results are questionable. Peter [2011-05-26 21:04, Modra] Message sent to observers

· Started at 21:35 (involved with star), measurable from 21:55 UT on May 23, 2011.

Stefan [2011-05-23 22:00, Modra]

· Observing it from 21:20 UT, on May 22, 2011.

Stefan [2011-05-22 21:38, Modra]

· Don't know how, but observing again, from 21:20UT. Object shows a fast variation and large amplitude... Jozef, Stefan [2011-05-21 22:01, Modra]

· Trying a challenge with this new object, started at 21:12 UT on May 20, 2011.

Stefan/Jozef [2011-05-21 00:35, Modra]

(13284) 1998 QB52 (Finished) [Add new note]
· Observations by Julian from Leura (4 nights) and from La Hita (2 nights) have resolved this one well:
http://www.asu.cas.cz/~asteroid/013284.png
There is no urgency to take more observations now. We will close the target here after joining in the observations from Abastumani.

Cheers, Petr [2011-09-08 13:36, Ondrejov] Message sent to observers

· Observed at 17:30-20UT on 29/30.08 at Abastumani.
Last night (28/29.08) observed from 20:30UT upto 1UT.

Yura [2011-08-30 00:22, Kharkiv]

· Started at midnight (20UT) at Abastumani. Yura [2011-08-28 22:16, Kharkiv] Message sent to observers

· Started tonight at 9hUT 08/24. hope to get the full night of 9h.Good condition expected. [2011-08-24 12:14, Blue Mountains Obs]

· Marek and Gabo from Skalnate Pleso took two nights of August 9 and 23 for this paired asteroid. They reveal a period about 5 hours, but not a unique solution with the two nights separated by 14 days. One of several possible solutions:
http://www.asu.cas.cz/~asteroid/013284.png

Two consecutive or nearby nights are needed to nail this one down. Marek isn't sure they will be able to take another night soon, and he suggests someone else here takes over this target. I encourage some of you to be taker.

Clear Skies, Petr [2011-08-24 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Aug. 23. Duration about 4.4 hr. LC shows a period about 5.2 hr and an amplitude ~0.2 mag. We will continue with this target.
Marek and Gabo [2011-08-24 08:12, SkalnatePleso] [Remove]
Message sent to observers

· Observed last night (Aug. 21), but observation was often interrupted by clouds. Short durations, only few usable points to lc.
Marek and Gabo [2011-08-22 12:03, SkalnatePleso] [Remove]

· Observed on Aug. 17. Data strongly affected by moonlight. Mag errors >0.6 - 0.8. This night should not be included.
Marek and Michal [2011-08-19 06:29, SkalnatePleso] [Remove]
Message sent to observers

· Observed on Aug. 9. The first estimate of period is 5.4 hr.
Marek [2011-08-17 13:04, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(5736) Sanford (Finished) [Add new note]
· This new target has been done with two nights by Kamil from here:
http://www.asu.cas.cz/~asteroid/05736.png
Earlier observations with somewhat poorer sampling by Don from Carbuncle Hill and Franck from Lick:
http://www.asu.cas.cz/~asteroid/05736_110701_20.png
Closed for this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-09-08 12:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Dear all, tonight I will be observing (5736) and (2897) as main targets plus (22166) and (19763) as complementary targets. Best wishes, Kamil [2011-08-28 18:25, Ondrejov] Message sent to observers

· Kamil has covered one period for this one on the past night:
http://www.asu.cas.cz/~asteroid/05736.png
Cf. with data obtained in July:
http://www.asu.cas.cz/~asteroid/05736_110701_20.png
At least one more session (errors < 0.03 mag) is needed to get double coverage in the asteroid's current geometry. We will not be able to observe it from here for at least next three nights due to another observing program at the telescope, so I encourage some of you take over and take more data to complete the target. Many thanks in advance.

Clear Skies, Petr [2011-08-24 07:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 19:35 UT. Should get one full period, if weather hold. Best wishes, Kamil [2011-08-23 19:38, Ondrejov] Message sent to observers

· Current status:
http://www.asu.cas.cz/~asteroid/05736.png

Clear Skies, Petr [2011-08-23 08:03, Ondrejov]

· Starting a run at 01:20 UT.
Don [2011-07-20 01:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting today at 06:09 UT for 4.5h from Lick-1m telescope. We observed it yesterday as well. [2011-07-06 06:27, Marchis]

· Started this target at 01:30 UT.
Don [2011-07-06 01:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(138524) 2000 OJ8 (Finished) - NEA [Add new note]
· This new NEA target was done by Jozef Vilagi, Adrian Galad and Stefan Gajdos from Modra on 3 full and 3 half nights: a U = 2 solution, good coverage, no deviation:
http://www.asu.cas.cz/~asteroid/138524.png
http://www.asu.cas.cz/~asteroid/138524_a.png
http://www.asu.cas.cz/~asteroid/138524_nsp.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the low-amplitude object.

Cheers, Petr [2011-09-08 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Thanks Peter, so I can try to look at this low amplitude LC NEA target again. Adrian. [2011-09-01 23:04, Modra]

· In case clouds disappear I (and Stefan) can continue tonight. Adrian [2011-08-30 18:47, Modra] Message sent to BinAstPhotSurvey conference

· Observing it from 20:00 UT. Stefan [2011-08-29 20:16, Modra]

· Observed from 22:20 UT on Aug.28 for ~4 hours. Stefan [2011-08-29 18:03, Modra]

(22166) 2000 WX154 (Finished) - slow rotator [Add new note]
· Another slow rotator observed by Kamil and Peter from here:
http://www.asu.cas.cz/~asteroid/22166.png
(The plot shows the data folded with a half period.)
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work on the slow rotators, guys.

Cheers, Petr [2011-09-06 09:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed as a complementary target last night. Peter K. [2011-09-02 08:11, Ondrejov] Message sent to observers

· I will to continue with this one tonight together with (19763) Klimesh. Best wishes, Kamil [2011-08-22 17:45, Ondrejov]

· Observing this one from 19:20 UT. Best wishes, Kamil [2011-08-21 19:25, Ondrejov] Message sent to observers

· Started this new target at 00:30 UT. Best wishes, Kamil [2011-08-21 00:51, Ondrejov] Message sent to BinAstPhotSurvey conference

(19763) Klimesh (Finished) - slow rotator [Add new note]
· Eight linked nights by Kamil and Peter from here gave a U = 2+, PAR = -1 solution for this new target:
http://www.asu.cas.cz/~asteroid/19763.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-09-06 09:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing as complementary target tonight. Peter K. [2011-09-01 20:38, Ondrejov] Message sent to observers

· Started this new target (as complementary) to (22166) 2000 WX154 at 20:20 UT. Best wishes, Kamil [2011-08-21 20:25, Ondrejov] Message sent to BinAstPhotSurvey conference

(7133) Kasahara (Finished) [Add new note]
· Leos Kornos and Stefan Gajdos worked this new target from Modra on 4 and half nights: Unique solution, good coverage, no prominent deviation,
http://www.asu.cas.cz/~asteroid/07133.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good, clean work, guys.

Cheers, Petr [2011-08-28 13:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 19:22 UT on Aug.26, 2011. Stefan [2011-08-26 19:27, Modra] Message sent to observers

· Observing it from 19:30 UT on Aug.25, 2011. Stefan [2011-08-25 19:33, Modra]

· Observed 24/25.8. from 19:20 to 02:05 UT. The second part of the night was cloudy. Data sent to Peter K. Leos [2011-08-25 07:36, Modra] Message sent to observers

· Object observed in 20/21.8 and 23/24.8. Leos [2011-08-24 11:41, Modra] Message sent to BinAstPhotSurvey conference

(18096) 2000 LM16 (Finished) - slow rotator [Add new note]
· Three calibrated Ondrejov nights revealed a long period, one of possible solutions:
http://www.asu.cas.cz/~asteroid/18096.png

Petr [2011-08-23 08:43, Ondrejov]

· Observing this one + (9556) Gaywray + (10188) Yasuoyoneda under light cirruses and excellent seeing. Best wishes, Kamil [2011-06-29 22:34, Ondrejov] Message sent to observers

· A short session taken for this new target by Nicolas Morales from Sierra Nevada: no obvious brightness change during the 2.5-h run,
http://www.asu.cas.cz/~asteroid/18096.png

At least two accurately linked nights are needed to show if it is a long-period object. Nicolas cannot observe it any longer now, so I encourage others here to take over.

Clear Skies, Petr [2011-06-27 11:04, Ondrejov] Message sent to BinAstPhotSurvey conference

(9556) Gaywray (Finished) - slow rotator [Add new note]
· Eight calibrated Ondrejov nights revealed that it has a long period, one of possible solutions:
http://www.asu.cas.cz/~asteroid/09556.png

Target closed.

Cheers, Petr [2011-08-23 08:22, Ondrejov]

· Began observing at 04:00 UT under good conditions. 8 hour session shows long trend upward. Phased and linked with my previous data, initial period looks to be greater than 50 hours. [2011-05-28 15:04, Via Capote] Message sent to observers

· Began observing under good conditions 04:00 UT [2011-05-28 04:12, Via Capote]

· Observing this one + 1990 KJ as supplemental target from 20:20 UT under good conditions. Best wishes, Kamil [2011-05-21 23:08, Ondrejov] Message sent to observers

· Jim Brinsfield has taken two 5-h sessions with good quality (rms residuals about 0.02 mag) from Via Capote. They reveal a low amplitude (0.03-0.04 mag) or long period, see
http://www.asu.cas.cz/~asteroid/09556.png
http://www.asu.cas.cz/~asteroid/09556_nsp.png
High quality data with errors of 0.01 mag and/or a couple linked nights are needed to resolve this one. Jim cannot observe it again in the next couple weeks, so I encourage others to help out.

Clear Skies, Petr [2011-05-17 09:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began observing 11:45 UT under good conditions. After two sessions no deviations observed. [2011-05-13 13:26, Via Capote] Message sent to observers

(1455) Michella (Finished) - slow rotator [Add new note]
· This one has been worked extensively by David from Hunters Hill, got a good long period solution, see
http://www.david-higgins.com/Astronomy/asteroid/results/output/1455.htm
It is closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work on the slow rotator, David.

Cheers, Petr [2011-08-22 06:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data over the past 5 days reveals a period of 118.8hrs +/- 0.2hrs with an amplitude of 0.6 +/- 0.02mag. Both maxima have been captured, just waiting to capture the minima. [2011-06-29 00:06, HuntersHill]

· Observed over the past 2 weeks in generally poor conditions. Data reveals a period in the order of 115.5 +/- 0.4 hrs with an amplitude of 0.6 +/- 0.02mag. This target can be closed for the purposes of BINAST. [2011-05-31 01:34, HuntersHill] Message sent to observers

· Observed 2011 05 15 from 11:00UT to 18:53UT in less than ideal conditions. Data for this session shows little variation except for a slight decline at the end of the session. Indications are for a period in excess of 130hrs. [2011-05-16 00:47, HuntersHill] Message sent to observers

· Observed 2011 05 14 from 11:00UT to 18:53UT in reasonable conditions. Data revealed a steady brightening in magnitude from 14.55 to 14.30 over this 8 hr period indicating a likely period of greater than 30 hrs. [2011-05-15 01:06, HuntersHill] Message sent to BinAstPhotSurvey conference

(64588) 2001 XX3 (Finished) [Add new note]
· This new target was done by Jozef, Stefan and Leos from Modra and by Peter K. from here: Unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/64588.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-08-22 05:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night from 22:15 UT to 02:30 UT in worse sky conditions. Leos [2011-08-20 11:23, Modra] Message sent to observers

· Observed last night from 19:20 UT to 02:30 UT. Leos [2011-08-19 02:52, Modra]

· Observing it from 19:31 UT. Stefan [2011-08-17 19:42, Modra]

· Observing it from ~21 UT under cirrus clouds, but usable perhaps after ~22 UT. Stefan [2011-08-14 23:23, Modra]

· Observing from 19:50UT, between clouds. Jozef, Stefan. [2011-08-13 20:10, Modra]

· Observed last night during short session (1.2 h). Period seems to be in range of 4-5 hours with amplitude ~0.75 mag. It should be an easy target (in the next lunation). Peter K. [2011-08-12 11:11, Ondrejov] Message sent to BinAstPhotSurvey conference

(11072) Hiraoka (Finished) [Add new note]
· This somewhat marginal "prime suspect" (P = 4.75 h, A ~ 0.3 mag) has been worked by Julian from Leura, by Kamil and Peter K. from here, and by Vasilij Chiorny from Kharkiv in its current apparition: Unique solution, multiple coverage, no trusted deviation,
http://www.asu.cas.cz/~asteroid/11072_b1.png
Closed for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-08-22 05:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· I go to observe this one from 19:30 UT for 5.3h. Best wishes, Kamil [2011-08-20 17:21, Ondrejov] Message sent to observers

· Observing this one tonight. Best wishes, Kamil [2011-08-18 19:51, Ondrejov]

· Observed for 4 hours last night. Plot bellow updated. Peter K. [2011-08-03 15:28, Ondrejov] Message sent to observers

· Julian has got four sessions for this prime suspect with a suspicious attenuation at the end of one night. As we need to confirme it I encourage more observers to observe this target (with errors <0.03 mag) as Julian should not have promissing weather in next couple of days/nights.

http://www.asu.cas.cz/~asteroid/11072_b1.png

Peter K. [2011-08-02 13:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on 07/28 10.7UT to 18 UT and 07/29 10.5UT to 19.3UT. under good condition. [2011-07-29 21:41, Blue Mountains Obs] Message sent to observers

· Started on this target on 07/27 from about 11 UT to 18UT. bimodal ightcurve period 4.71h [2011-07-28 10:54, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Don's data for this one are somewhat marginal (crowded fields), but they are still usable. Unique period and good coverage, with a few marginal deviations having a character suggesting that they are artifacts rather than real features. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don, in the tough conditions.

Petr [2007-06-11 09:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Run began at ~01:30 UT.
Don [2007-06-07 02:11, CarbuncleHill]

· Starting a run on this at 03:30 UT.
Don [2007-05-25 02:55, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting a third night on this at about 03:30 UT.
Don [2007-05-24 02:47, CarbuncleHill]

(1718) Namibia (Finished) [Add new note]
· This one has been worked extensively from Ondrejov, Modra, Carbuncle Hill, Hunters Hill and Skalnate Pleso: Unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/01718.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2011-08-22 05:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 19:30 UT in good sky conditions. Leos [2011-08-20 22:59, Modra] Message sent to observers

· Observing it from 19:47 UT, awaiting cirrus clouds. Stefan [2011-08-16 19:57, Modra]

· Observing from 20:20 UT. Jozef [2011-08-10 20:26, Modra]

· Observed 20110804 from 0932UT to 1734UT in good conditions. [2011-08-04 22:12, HuntersHill] Message sent to observers

· Observing this one from 21:25 UT. Best wishes, Kamil + students [2011-07-27 21:57, Ondrejov]

· Observing this one from 20:40 UT. Best wishes, Kamil [2011-07-23 20:43, Ondrejov] Message sent to observers

· Last night I observed this, but with changing conditions and background star the lightcurve is quite "ragged". Adrian [2011-07-23 15:31, Modra] Message sent to BinAstPhotSurvey conference

· Plan to start a run on this at 02:50 UT.
DOn [2011-07-20 01:17, CarbuncleHill]

· Observing this one from 22:50 UT. Best wishes, Kamil [2011-07-12 00:07, Ondrejov] Message sent to observers

· Observed for 3 hours last night. Data suggest slower rotation with 6+ hours period. Peter K. [2011-07-07 05:59, Ondrejov]

· Observed 20120702 from 12:13UT to 14:36UT in reasonable conditions before clouds rolled in. Data reveals a possible ~6hr period with an amplitude not less than 0.11 mag. [2011-07-06 23:19, HuntersHill] Message sent to observers

· Plan to start this at about 04:00 UT.
Don [2011-07-06 01:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(10187) 1996 JV (Finished) [Add new note]
· This one has been worked from Modra on 13 nights from 2011-04-19 to 05-20. The best fit is for a quadrumodal lightcurve with a period of 21.676 h:
http://www.asu.cas.cz/~asteroid/10187_21h.png
A period of 10.838 h (bimodal lightcurve) is, however, possible if the lightcurve shape changed in a course of the observing period; the first five nights and the last eight nights, when fitted separately, fit well with the shorter period, see
http://www.asu.cas.cz/~asteroid/10187_10h_a.png
http://www.asu.cas.cz/~asteroid/10187_10h_b.png
So, it remains ambiguous. Closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good effort, guys, on the difficult case.

Petr [2011-06-13 13:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing tonight from 19:40UT. Jozef, Stefan. [2011-05-19 20:57, Modra]

· Observing it from 20:05 UT.
Stefan [2011-05-09 21:06, Modra] Message sent to observers

· Observing it from 20:24 UT.

Stefan [2011-05-08 20:46, Modra] Message sent to BinAstPhotSurvey conference

· Observing from 19:35UT. Jozef, Stefan. [2011-05-07 19:30, Modra]

· Observing from 19:50UT. Jozef, Stefan [2011-05-05 20:17, Modra]

· Observing from ~19:35 UT in good conditions. Jozef [2011-05-04 19:35, Modra]

· Observed in 1/2 May 2011 in good sky conditions. Leos [2011-05-02 08:18, Modra] Message sent to observers

· Starting at 22 UT in moderate conditions. I hope it will be better. Leos [2011-04-28 22:10, Modra]

· Observing from 19:15UT. Jozef, Stefan. [2011-04-22 19:50, Modra]

· Observing from 19:20UT. Jozef, Leos. [2011-04-20 19:26, Modra]

· Observing from 19:20 UT. Jozef, Leos. [2011-04-19 19:32, Modra] Message sent to BinAstPhotSurvey conference

(5342) LePoole (Finished) [Add new note]
· This slowish rotator was done uniquely by Michal and Marek from Skalnate Pleso, Joe with PROMPT, and Peter K. from here:
http://www.asu.cas.cz/~asteroid/05342.png
For objects with P > 10 hours, we don't require a full orbit coverage for the BinAstPhotSurvey, so we count this one as done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2011-05-20 12:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21:00 UT in relatively good conditions. Michal [2011-05-20 00:19, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 20:00 UT in good conditions. Michal [2011-05-11 20:11, SkalnatePleso] [Remove]

· Observing from 23:45 UT in average conditions. Michal [2011-05-10 00:21, SkalnatePleso] [Remove]
Message sent to observers

· Observed 0200-0930 UT from Prompt last night. Joe [2011-04-26 18:34, Dark Sky & PROMPT]

· Observed for 1.5 h last night. Data suggest period of 6+ hours and amplitude >0.3 mag. Peter K. [2011-04-25 23:30, Ondrejov] Message sent to BinAstPhotSurvey conference

(30116) 2000 FA36 (Finished) [Add new note]
· This new target was done satisfactorily by Peter and Kamil from here on four nights, total coverage of 18 hours, no significant deviation,
http://www.asu.cas.cz/~asteroid/30116.png
Done for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-05-12 10:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will observe this one from 20:20 UT. Best wishes, Kamil [2011-05-09 15:11, Ondrejov] Message sent to observers

· Observing from 20:25 UT. Peter K. [2011-05-08 20:50, Ondrejov]

· Started this new target at 20:11 UT. Best wishes, Kamil [2011-05-07 20:13, Ondrejov] Message sent to BinAstPhotSurvey conference

(3541) Graham (Finished) - returning prime suspect [Add new note]
· This return "prime suspect" was done by Marek, Michal and Gabo from Skalnate Pleso in the 2nd apparition: High quality data, good coverage, no deviation:
http://www.asu.cas.cz/~asteroid/03541_b1.png
Closed for the 2nd apparition.

Good work, guys.

Cheers, Petr [2011-05-08 08:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed last night with 5 hr coverage. Data sent to Peter K.

Marek, Gabo [2011-05-06 12:43, SkalnatePleso] [Remove]
Message sent to observers

· Here is an actual image with data from Skalnate Pleso. One more night is needed for double coverage of all rotational phases. http://www.asu.cas.cz/~asteroid/03541_b1.png

Peter K. [2011-05-06 09:06, Ondrejov]

· We observed this object from previous lunation in three nights. Period 3.5275 and amplitude 0.13 are very similar as in the year 2007 http://www.asu.cas.cz/~asteroid/03541.png

Marek, Michal, Gabo [2011-05-05 12:30, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(2398) Jilin (Finished) [Add new note]
· This return "prime suspect" was done by Julian from Leura satisfactorily in this 2nd apparition: Good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/02398_b1.png
The current data are somewhat noisier than in the 1st apparition, cf.
http://www.asu.cas.cz/~asteroid/02398.png
which was mostly due to its lower brightness in this apparition when the asteroid is further away from perihelion, but the data are still useable. Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Julian.

Cheers, Petr [2011-04-14 14:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· target worked on for the last 4 nights. Period of 3 hours found. [2011-04-12 14:17, Blue Mountains Obs]

· This one has been done by Adrian from Modra (3 nights) and by Peter K. from here (1 night): unique period, multiple coverage, no deviation,
http://www.asu.cas.cz/~asteroid/02398.png
It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Adrian and Peter.

Cheers, Petr [2007-02-23 12:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· I continued with this last night but was unable to report about it due to internet disconnection. Adrian [2007-02-23 08:44, Modra]

· Observing from 18:15 UT but don't know how long I will be able (there is a fog approaching from SE). Peter K. [2007-02-21 19:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· I continue with this. Adrian [2007-02-21 00:34, Modra]

· Observed 14/15.1. 21:10-04:57 UT. Amplitude about 0.13 mag. [2007-01-15 17:25, Modra] Message sent to BinAstPhotSurvey conference

(2675) Tolkien (Finished) [Add new note]
· Slow rotator, closed for the Survey. Petr [2011-04-14 13:01, Ondrejov]

· Did a short run tonight.

Russ [2011-03-16 05:05, Shed of Science] Message sent to observers

· Two sessions obtained one UT Mar 1 and UT Mar 4.
Trending down [2011-03-04 13:45, Via Capote]

· A break in the cloud will allow me to get a short run in on 2675 Tolkien tonight.

Russ [2011-02-27 00:32, Shed of Science] Message sent to observers

· Weather conditions have not permitted me to work this object recently. Our results indicate it is a very long period object with a period near 1000 hrs and a 0.4mag amplitude. I have covered just over one complete period and so far there is no evidence of tumbling. We are in need of more observations on this object now and in the next few weeks so that we can have double coverage of the period and increase confidence in our results. Due to the extreme period, we are in need of only linked sessions using the Canopus comp star selector, or calibrated sessions. Only a short session is required on each night to be useful.

Thanks for your help!

Regards,

Russ [2011-02-26 05:35, Shed of Science] Message sent to BinAstPhotSurvey conference

· Taking a short run on Tolkien tonight although moon is probably going to be too bright.

Russ [2011-02-16 03:21, Shed of Science] Message sent to observers

· Just started a run on Tolkien tonight at about 2:UT.

Russ [2011-02-11 01:07, Shed of Science]

· Started another night on Tolkien at about 1:45UT

Russ [2011-02-10 02:13, Shed of Science] Message sent to observers

· Started on this one a few minutes ago.

Russ [2011-02-09 01:24, Shed of Science]

· Starting another night on this object.

Russ [2011-02-08 00:48, Shed of Science] Message sent to observers

· Long period object. I have done a few more nights on this one and a period of 80 hrs is one solution. Will continue to follow on my own as I can outside the survey.

Russ [2011-01-22 00:55, Shed of Science]

· Started a run under good conditions.

Russ [2011-01-09 01:11, Shed of Science] Message sent to observers

· Started this new target under ok conditions. May end up being only a 4-5 hour session.

Russ [2011-01-05 03:44, Shed of Science] Message sent to BinAstPhotSurvey conference

(2754) Efimov (Finished) - Return binary [Add new note]
· This return binary was done in the 2nd apparition by Peter and Kamil from here: the primary and orbit periods as well as the size ratio refined, and the H, G parameters of the phase relation estimated.
http://www.asu.cas.cz/~asteroid/02754_11_porb.png
http://www.asu.cas.cz/~asteroid/02754_11_p1.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2011-03-11 12:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 18:25 UT. Best wishes, Kamil [2011-03-06 18:32, Ondrejov] Message sent to observers

· This return binary is fading, but it is still observable and Peter K. took good data on Feb. 25.9. The current data:
http://www.asu.cas.cz/~asteroid/02754_11_porb.png
http://www.asu.cas.cz/~asteroid/02754_11_p1.png

One more session covering the 0.25-phase event with errors < 0.02 mag will complete it for this apparition; event ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2-28 16.83 0.245
2011- 3- 1 7.60 0.245
2011- 3- 1 22.37 0.245
2011- 3- 2 13.14 0.245
2011- 3- 3 3.91 0.245
2011- 3- 3 18.68 0.245
2011- 3- 4 9.45 0.245
2011- 3- 5 0.22 0.245
2011- 3- 5 14.99 0.245
2011- 3- 6 5.76 0.245
2011- 3- 6 20.53 0.245
2011- 3- 7 11.30 0.245
2011- 3- 8 2.07 0.245
2011- 3- 8 16.84 0.245
2011- 3- 9 7.61 0.245
2011- 3- 9 22.38 0.245
2011- 3-10 13.15 0.245

Clear Skies, Petr [2011-02-28 14:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:10 UT. Peter K. [2011-02-25 19:34, Ondrejov] Message sent to observers

· Observing at Prompt. Started 0030 UT to get 0.250 phase event.
Joe [2011-02-24 02:10, Dark Sky & PROMPT]

· Observing at Prompt. Started 0457 UT. 0.250 phase event at 0740 UT. Joe [2011-02-13 08:05, Dark Sky & PROMPT] Message sent to observers

· Two nights by Peter and Kamil from here so far:
http://www.asu.cas.cz/~asteroid/02754_11_porb.png
http://www.asu.cas.cz/~asteroid/02754_11_p1.png

One session for each of the two events needed to complete double coverage. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2- 9 15.04 0.250
2011- 2-10 5.81 0.250
2011- 2-10 20.58 0.250
2011- 2-11 11.35 0.250
2011- 2-12 2.12 0.250
2011- 2-12 16.89 0.250
2011- 2-13 7.66 0.250
2011- 2-13 22.43 0.250
2011- 2-14 13.20 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2- 9 22.34 0.745
2011- 2-10 13.11 0.745
2011- 2-11 3.88 0.745
2011- 2-11 18.65 0.745
2011- 2-12 9.42 0.745
2011- 2-13 0.19 0.745
2011- 2-13 14.96 0.745
2011- 2-14 5.73 0.745
2011- 2-14 20.50 0.745

Clear Skies, Petr [2011-02-09 11:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began observing from Prompt at 0056 UT but weather came in 0350 UT. Joe [2011-02-09 06:15, Dark Sky & PROMPT] Message sent to observers

· Observing from 20:45 UT. Peter K. [2011-02-08 20:53, Ondrejov]

· Kamil took first observations for this return binary in its current apparition:
http://www.asu.cas.cz/~asteroid/02754_11_porb.png
http://www.asu.cas.cz/~asteroid/02754_11_p1.png

A few more nights with errors < 0.02 mag are needed to complete (double) coverage for both events, their ephemerides:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 1-31 9.33 0.240
2011- 2- 1 0.10 0.240
2011- 2- 1 14.87 0.240
2011- 2- 2 5.64 0.240
2011- 2- 2 20.41 0.240
2011- 2- 3 11.18 0.240
2011- 2- 4 1.95 0.240
2011- 2- 4 16.72 0.240
2011- 2- 5 7.49 0.240
2011- 2- 5 22.26 0.240
2011- 2- 6 13.03 0.240
2011- 2- 7 3.80 0.240
2011- 2- 7 18.57 0.240
2011- 2- 8 9.34 0.240
2011- 2- 9 0.11 0.240
2011- 2- 9 14.88 0.240
2011- 2-10 5.65 0.240
2011- 2-10 20.42 0.240
2011- 2-11 11.19 0.240
2011- 2-12 1.96 0.240
2011- 2-12 16.73 0.240
2011- 2-13 7.50 0.240
2011- 2-13 22.27 0.240
2011- 2-14 13.04 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2011- 1-31 1.95 0.740
2011- 1-31 16.72 0.740
2011- 2- 1 7.49 0.740
2011- 2- 1 22.26 0.740
2011- 2- 2 13.03 0.740
2011- 2- 3 3.80 0.740
2011- 2- 3 18.57 0.740
2011- 2- 4 9.34 0.740
2011- 2- 5 0.11 0.740
2011- 2- 5 14.88 0.740
2011- 2- 6 5.65 0.740
2011- 2- 6 20.42 0.740
2011- 2- 7 11.19 0.740
2011- 2- 8 1.96 0.740
2011- 2- 8 16.73 0.740
2011- 2- 9 7.50 0.740
2011- 2- 9 22.27 0.740
2011- 2-10 13.04 0.740
2011- 2-11 3.81 0.740
2011- 2-11 18.58 0.740
2011- 2-12 9.35 0.740
2011- 2-13 0.12 0.740
2011- 2-13 14.89 0.740
2011- 2-14 5.66 0.740
2011- 2-14 20.43 0.740

Clear Skies, Petr [2011-01-31 10:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began observing from Prompt 0115 UT under excellent conditions. Will try to follow until 0900 UT to overlap and (and extend?) Kamil's observations. Joe [2011-01-31 01:23, Dark Sky & PROMPT] Message sent to observers

· Started this one at 19:35 UT. Best wishes, Kamil [2011-01-30 21:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· This binary is too faint now for more observations in this apparition, we are closing it here now. Petr [2006-12-01 12:08, Ondrejov]

· The clouds came in solid, so that's it for tonight. No useful data.
Don [2006-11-19 02:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started this at 23:10 Nov 18 UT, targeting the secondary event at 1.91ut. Hopefully, clouds will alow it.
Don [2006-11-18 23:20, CarbuncleHill]

· I started this at around 23:00 Nov 17 UT, targeting the the primary event at 3.98ut.
Don [2006-11-17 23:26, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· The Modra data of Oct. 17.8 have been revised (a CCD imperfection was found to affect a part of images there), and one more detection of the primary event was done by Don on Oct. 22.1. The October data separated in the two components see
http://www.asu.cas.cz/~asteroid/2754_longpc_b.png
http://www.asu.cas.cz/~asteroid/2754_shortpc_b.png
All data covering the primary event agree well. The secondary event has been covered more poorly, but the one session there suggests a longer duration. An explanation of the apparent different durations of the events is not clear yet, we will see what further data will tell us.

The asteroid will be still observable after the full moon and follow up observations will be useful to further describe the system. (Also, they should confirm (or not) the apparently different durations of the events seen in the past lunation.) Coverage of events plus some phases before and/or after them is needed. Errors <0.02 mag and long sessions are needed, so don't bother in poorer conditions. Ephemerides for the events:

Date/Time UTC (LTc.) Phase
--------------------------
2006-11-10 3.97 0.265
2006-11-10 18.74 0.265
2006-11-11 9.51 0.265
2006-11-12 0.28 0.265
2006-11-12 15.05 0.265
2006-11-13 5.82 0.265
2006-11-13 20.59 0.265
2006-11-14 11.36 0.265
2006-11-15 2.13 0.265
2006-11-15 16.90 0.265
2006-11-16 7.67 0.265
2006-11-16 22.44 0.265
2006-11-17 13.21 0.265
2006-11-18 3.98 0.265
2006-11-18 18.75 0.265
2006-11-19 9.52 0.265
2006-11-20 0.29 0.265
2006-11-20 15.06 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2006-11-10 11.13 0.750
2006-11-11 1.90 0.750
2006-11-11 16.67 0.750
2006-11-12 7.44 0.750
2006-11-12 22.21 0.750
2006-11-13 12.98 0.750
2006-11-14 3.75 0.750
2006-11-14 18.52 0.750
2006-11-15 9.29 0.750
2006-11-16 0.06 0.750
2006-11-16 14.83 0.750
2006-11-17 5.60 0.750
2006-11-17 20.37 0.750
2006-11-18 11.14 0.750
2006-11-19 1.91 0.750
2006-11-19 16.68 0.750
2006-11-20 7.45 0.750
2006-11-20 22.22 0.750

Clear Skies, Petr [2006-11-05 10:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Between wind clouds and a background star, data was useless and not submitted.
Don [2006-10-26 20:51, CarbuncleHill]

· I started this at 01:10ut to catch the 01:55 attenuation.
Don [2006-10-26 01:14, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Will be doing this tonight to catch the 2:10 primary event.
Don [2006-10-21 21:23, CarbuncleHill]

· Follow up observations taken in this lunation by David from Hunters Hill, by Don from Carbuncle Hill, and by Stefan from Modra (2 nights from each station) showed that its mutual events evolved. The secondary event (covered only once) has a long duration indicating that both events occur there, and its apparent central peak (needs to be confirmed) suggests that the events are not central now. The short duration of the primary event seen in the last night Oct 19.0 by Don (also in David's data of Oct. 10, though those are of lower sampling rate) disagrees with the Modra data of Oct. 17.8; a check of the data, and especially one more good session covering the primary event are needed. I don't suggest what the different shapes and durations of the events mean until we get one more good coverage for both events.
http://www.asu.cas.cz/~asteroid/2754_longpc_b.png
http://www.asu.cas.cz/~asteroid/2754_shortpc_b.png

So, each event needs to be covered once more, with long session with some coverage both before and after the event, and with errors about 0.01 mag. Don't bother in poorer conditions. Ephemerides for the events:

Date/Time UTC (LTc.) Phase
--------------------------
2006-10-20 5.86 0.270
2006-10-20 20.63 0.270
2006-10-21 11.40 0.270
2006-10-22 2.17 0.270
2006-10-22 16.94 0.270
2006-10-23 7.71 0.270
2006-10-23 22.48 0.270
2006-10-24 13.25 0.270
2006-10-25 4.02 0.270
2006-10-25 18.79 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2006-10-19 22.21 0.752
2006-10-20 12.98 0.752
2006-10-21 3.75 0.752
2006-10-21 18.52 0.752
2006-10-22 9.29 0.752
2006-10-23 0.06 0.752
2006-10-23 14.83 0.752
2006-10-24 5.60 0.752
2006-10-24 20.37 0.752
2006-10-25 11.14 0.752
2006-10-26 1.91 0.752

Clear Skies, Petr [2006-10-19 14:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 23:15 Oct 18 UT. Hope to catch the 00:12, Oct 19UT event.
Don [2006-10-19 00:35, CarbuncleHill]

· Started with it on 17:22 UT, Oct.17. A faint star is in its course, which could slightly affect observation of the primary event.

Stefan [2006-10-17 17:45, Modra] Message sent to BinAstPhotSurvey conference

· Started this at 23:30 Oct 16 UT.
Don [2006-10-16 23:44, CarbuncleHill]

· Observing from 18:48 UT Oct.16 with aim of an event covering.

Stefan [2006-10-16 19:01, Modra] Message sent to BinAstPhotSurvey conference

· Three night from this lunation were joined in. Two of them were taken by David Higgins (Oct.10 and 11) and one by Don Pray (Oct.15 and Don is taking another run now). All data are consistent with periods derived in the past lunation and both events are still visible. What we need now is a better coverage of all orbital phases.

Here is an ephemeris for next couple of days (until Oct.20) for better planning of your observations (times in UT).

2006 10 16 20.50 0.750
2006 10 17 3.89 0.250
2006 10 17 11.27 0.750
2006 10 17 18.66 0.250
2006 10 18 2.04 0.750
2006 10 18 9.43 0.250
2006 10 18 16.81 0.750
2006 10 19 0.20 0.250
2006 10 19 7.58 0.750
2006 10 19 14.97 0.250
2006 10 19 22.35 0.750

Don't cover only short events but also parts outside them.

Peter K. [2006-10-16 12:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing another run on this tonight. Started at 1:00, Oct 16 UT.
Don [2006-10-16 01:04, CarbuncleHill]

· I started this at around 1:00, Oct 15 UT.
Don [2006-10-15 01:17, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed from 09:22UT to 15:18UT in reasonable conditions.

Data sent to Petr and Peter. [2006-10-12 01:53, HuntersHill]

· Observed from 09:19UT to 15:15UT in average conditions.

Data sent to Petr [2006-10-10 22:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Peter K. has got a second session covering the secondary event in this lunation. The long period component covered in this lunation so far see
http://www.asu.cas.cz/~asteroid/2754_longpc_a.png
The coverage is sufficient for this lunation; I don't expect a major evolution of the events during the rest of this lunation. In the next lunation when the asteroid will be well past opposition, a resumed follow-up will be useful again, as events may evolve by then.

Cheers, Petr [2006-09-21 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:20 UT and expecting 4 hours long run covering the whole secondary event. Peter K. [2006-09-20 22:48, Ondrejov]

· New data joined in:
2006-09-13.2 by Russ Durkee from Shed of Science Observatory
2006-09-14.9 by Peter K. from here.
The long period component covered in this lunation so far see
http://www.asu.cas.cz/~asteroid/2754_longpc_a.png
One more coverage of the secondary event wouldn't harm, but generally the data show a quite regular behavior for the binary so far.

Cheers, Petr [2006-09-18 14:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:50 UT and expecting about 6 hours long run (if weather permits) covering secondary event. Peter K. [2006-09-14 19:14, Ondrejov]

· Jozef Vilagi from Modra has covered most of the primary event on Sept. 12.0, see following plots with his data highlighted:
http://www.asu.cas.cz/~asteroid/2754_longpc.png
http://www.asu.cas.cz/~asteroid/2754_shortpc.png
Completing a coverage of the primary event with one more good session will be good.
The solution hasn't changed significantly, though Porb appears to be closer to 14.770 h now. The ephemerides I gave here on Sept. 7 are good to ~20 minutes now, nevertheless, I am enclosing updated ephemerides for both events:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 9-14 12.87 0.247
2006- 9-15 3.64 0.247
2006- 9-15 18.41 0.247
2006- 9-16 9.18 0.247
2006- 9-16 23.95 0.247
2006- 9-17 14.72 0.247
2006- 9-18 5.49 0.247
2006- 9-18 20.26 0.247
2006- 9-19 11.03 0.247
2006- 9-20 1.80 0.247
2006- 9-20 16.57 0.247
2006- 9-21 7.34 0.247
2006- 9-21 22.11 0.247
2006- 9-22 12.88 0.247
2006- 9-23 3.65 0.247
2006- 9-23 18.42 0.247
2006- 9-24 9.19 0.247
2006- 9-24 23.96 0.247
2006- 9-25 14.73 0.247
2006- 9-26 5.50 0.247
2006- 9-26 20.27 0.247
2006- 9-27 11.04 0.247
2006- 9-28 1.81 0.247
2006- 9-28 16.58 0.247
2006- 9-29 7.35 0.247
2006- 9-29 22.12 0.247
2006- 9-30 12.89 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2006- 9-14 20.29 0.750
2006- 9-15 11.06 0.750
2006- 9-16 1.83 0.750
2006- 9-16 16.60 0.750
2006- 9-17 7.37 0.750
2006- 9-17 22.14 0.750
2006- 9-18 12.91 0.750
2006- 9-19 3.68 0.750
2006- 9-19 18.45 0.750
2006- 9-20 9.22 0.750
2006- 9-20 23.99 0.750
2006- 9-21 14.76 0.750
2006- 9-22 5.53 0.750
2006- 9-22 20.30 0.750
2006- 9-23 11.07 0.750
2006- 9-24 1.84 0.750
2006- 9-24 16.61 0.750
2006- 9-25 7.38 0.750
2006- 9-25 22.15 0.750
2006- 9-26 12.92 0.750
2006- 9-27 3.69 0.750
2006- 9-27 18.46 0.750
2006- 9-28 9.23 0.750
2006- 9-29 0.00 0.750
2006- 9-29 14.77 0.750
2006- 9-30 5.54 0.750
2006- 9-30 20.31 0.750

Cheers, Petr [2006-09-14 07:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a run at 3:00UT on the 13th. Should be able to go all night.

Cheers,

Russ [2006-09-13 03:00, Shed of Science]

· Mutual events in this binary are bound to evolve with changing geometry during this apparition, so their monitoring will be needed. Their ephemerides are enclosed below. Only good data (errors <=0.02 mag) are needed, so don't bother in problematic conditions. Since a coverage of at least one primary period (2.45 h) before and/or after events is needed as well, to check a stability of the primary's lightcurve shape, it is best to plan a long session (not only a short one covering just the event with little coverage outside it).

Clear Skies, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2006- 9-11 10.76 0.240
2006- 9-12 1.53 0.240
2006- 9-12 16.29 0.240
2006- 9-13 7.06 0.240
2006- 9-13 21.82 0.240
2006- 9-14 12.59 0.240
2006- 9-15 3.35 0.240
2006- 9-15 18.12 0.240
2006- 9-16 8.88 0.240
2006- 9-16 23.65 0.240
2006- 9-17 14.41 0.240
2006- 9-18 5.18 0.240
2006- 9-18 19.94 0.240
2006- 9-19 10.71 0.240
2006- 9-20 1.47 0.240
2006- 9-20 16.24 0.240
2006- 9-21 7.00 0.240
2006- 9-21 21.77 0.240
2006- 9-22 12.53 0.240
2006- 9-23 3.30 0.240
2006- 9-23 18.06 0.240
2006- 9-24 8.83 0.240
2006- 9-24 23.59 0.240
2006- 9-25 14.36 0.240
2006- 9-26 5.12 0.240
2006- 9-26 19.89 0.240
2006- 9-27 10.65 0.240
2006- 9-28 1.42 0.240
2006- 9-28 16.18 0.240
2006- 9-29 6.95 0.240
2006- 9-29 21.71 0.240
2006- 9-30 12.48 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2006- 9-11 18.45 0.760
2006- 9-12 9.22 0.760
2006- 9-12 23.98 0.760
2006- 9-13 14.75 0.760
2006- 9-14 5.51 0.760
2006- 9-14 20.28 0.760
2006- 9-15 11.04 0.760
2006- 9-16 1.81 0.760
2006- 9-16 16.57 0.760
2006- 9-17 7.34 0.760
2006- 9-17 22.10 0.760
2006- 9-18 12.87 0.760
2006- 9-19 3.63 0.760
2006- 9-19 18.40 0.760
2006- 9-20 9.16 0.760
2006- 9-20 23.93 0.760
2006- 9-21 14.69 0.760
2006- 9-22 5.46 0.760
2006- 9-22 20.22 0.760
2006- 9-23 10.99 0.760
2006- 9-24 1.75 0.760
2006- 9-24 16.52 0.760
2006- 9-25 7.28 0.760
2006- 9-25 22.05 0.760
2006- 9-26 12.81 0.760
2006- 9-27 3.58 0.760
2006- 9-27 18.34 0.760
2006- 9-28 9.11 0.760
2006- 9-28 23.87 0.760
2006- 9-29 14.64 0.760
2006- 9-30 5.40 0.760
2006- 9-30 20.17 0.760 [2006-09-07 04:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:46UT to 17:52UT in good conditions. Even though it was lowish on my northern horizon I was able to get errors better than 0.01mag. Period in agreement with 2.45 +/- 0.04hrs, Amplitude of my observations 0.1 +/- 0.01mag.

Data sent to Petr and Peter. [2006-09-04 22:20, HuntersHill] Message sent to BinAstPhotSurvey conference

· Our discovery announcement on this binary has appeared on CBET 617. For your convenience, I am copying a text of the circular below. I'll put a note on it on the Survey's page
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
in a few minutes.

Cheers, Petr

(2754) EFIMOV
D. Pray, Carbuncle Hill Observatory, Greene, RI; P. Pravec,
Ondrejov Observatory; M. Pikler and M. Husarik, Skalnate Pleso
Observatory; R. Stephens, Goat Mountain Astronomical Research
Station, Yucca Valley, CA; G. Masi, Bellatrix Observatory, Ceccano,
Italy; R. Durkee, Minneapolis, MN; and R. Goncalves, Linhaceira,
Tomar, Portugal, report that photometric observations obtained
during Aug. 14-Sept. 1 reveal that minor planet (2754) is a binary
system with an orbital period of 14.765 ± 0.01 hours. The primary
rotates with a period of 2.4497 ± 0.0002 hours, and it has a
lightcurve amplitude of 0.15 mag. Mutual eclipse/occultation
events that are 0.04-0.09 mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.20 ± 0.03.

(C) Copyright 2006 CBAT
2006 September 4 (CBET 617) Daniel W. E. Green [2006-09-04 11:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Gianluca has covered the secondary event well on the last night of Sept 1.9. (A short session by Don of Aug 31.3 covering phases outside the events joined in as well.) The solution has been nailed down:
Pprim= 2.4497 +/- 0.0002 h
Porb= 14.765 +/- 0.01 h
Aprim= 0.15 mag
Depth of the events: 0.04-0.09 mag
Ds/Dp = 0.20 +/-0.03
http://www.asu.cas.cz/~asteroid/2754_longpc.png
http://www.asu.cas.cz/~asteroid/2754_shortpc.png

We are going to update the announcement on this binary and we will circulate it among all collaborators for approval later today.

Cheers, Petr [2006-09-02 11:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· started at 20:05 under good weather conditions. Very likely ending at 23:30 UT, as a bright star is in front of this object and they planned a rendez vous.

Cheers,
Gianluca [2006-09-01 23:28, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· This case illustrates it why we always want a good coverage of all orbital phases. With the data Aug. 14-22 that we had when I analysed it on Aug. 23, some phases for the then-preferred solution with Porb of 29.54 h have got little or no coverage. With recent data by Don Pray (Aug 23.2), by Gianluca Masi (Aug 27.0), by Russ Durkee (Aug 27.3), and by Rui Goncalves (Aug 30.0), it emerges that the orbital period is actually half that we estimated with the incomplete data on Aug. 23, i.e., Porb=14.77 h. All the deep events we have seen before (and which was re-observed by Gianluca on Aug 27) were actually primary events, while a shallow secondary event begins to be recognizable with the more abundant data now. The secondary event needs to be covered more thoroughly, but the current data indicate Ds/Dp of 0.20, i.e., a relatively small secondary. (The deeper primary event is due to both occultation and eclipse occuring there.)
Pprim= 2.4497 +/-0.0002 h
Porb= 14.77 +/-0.01 h
Aprim= 0.15 mag
Depth of the events: 0.04-0.09 mag
Ds/Dp = 0.20 +/-0.03
http://www.asu.cas.cz/~asteroid/2754_longpc.png
http://www.asu.cas.cz/~asteroid/2754_shortpc.png

We need to nail down the solution especially with more coverage of the secondary event, its ephemeris follows. Remember to cover also phases outside the event, so observe for at least a few hours before and/or after the predicted times.

Date/Time UTC (LTc.) Phase
--------------------------
2006- 8-31 1.89 0.755
2006- 8-31 16.66 0.755
2006- 9- 1 7.43 0.755
2006- 9- 1 22.20 0.755
2006- 9- 2 12.97 0.755
2006- 9- 3 3.74 0.755
2006- 9- 3 18.51 0.755
2006- 9- 4 9.28 0.755
2006- 9- 5 0.05 0.755
2006- 9- 5 14.82 0.755
2006- 9- 6 5.59 0.755

More coverage of the primary event is less urgent now, but it is expected to evolve, so its monitoring would be useful as well. Its ephemeris follows:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 8-30 18.36 0.245
2006- 8-31 9.13 0.245
2006- 8-31 23.90 0.245
2006- 9- 1 14.67 0.245
2006- 9- 2 5.44 0.245
2006- 9- 2 20.21 0.245
2006- 9- 3 10.98 0.245
2006- 9- 4 1.75 0.245
2006- 9- 4 16.52 0.245
2006- 9- 5 7.29 0.245
2006- 9- 5 22.06 0.245

In the current phase of our work on the binary, only data with errors not greater than 0.02 mag will be useful. Don't bother in poorer conditions.

Our discovery announcement on this binary will be published on CBET after we complete the discovery phase with more secondary events well covered and the solution nailed down.

Clear Skies, Petr [2006-08-30 18:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· I am getting started on 2754 Efimov at about 3:15UT and should be able to follow it for the next 4-5 hours.

Regards,

Russ [2006-08-27 03:07, Shed of Science]

· session finished at 2:00 UT. I very quick check shows data should be fine. Once fully reduced, they will be send to Petr.

Good night/day,
Gianluca [2006-08-27 02:34, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· session started around 21:00UT. It should last 4.5-5 hours.

Cheers,
Gianluca [2006-08-26 23:34, BellatrixObservatory]

· I'll be doing this tonight, but clouds may cut it short.
Don [2006-08-24 02:02, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· New data by Michal and Marek from Skalnate Pleso (2 nights) and by Don from Carbuncle Hill (1 night) joined in. Don has covered most of the 0.25-phase event. He has been taking more data in the past night that should cover a part of the event again. An updated solution with the current data:
Pprim= 2.4493 +/-0.0002 h
Porb= 29.54 +/-0.03 h
Aprim= 0.17 mag
Depth of the events: 0.09 mag
Ds/Dp>= 0.29
http://www.asu.cas.cz/~asteroid/2754_all.png
http://www.asu.cas.cz/~asteroid/2754_longpc.png
http://www.asu.cas.cz/~asteroid/2754_shortpc.png

Cheers, Petr [2006-08-23 11:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this around 03:15, Aug23 UT.
Don [2006-08-23 01:24, CarbuncleHill]

· Observing from 20:20 UT. Michal [2006-08-22 20:22, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Will be starting this around 03:00, Aug22 UT.
Don [2006-08-21 23:48, CarbuncleHill]

· Observing from 22:00 UT. Variable Sc at the station altitude at the moment, but expecting better conditions in next hours.Michal [2006-08-21 22:11, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Six new sessions, by Don from Carbuncle Hill, by Michal and Marek from Skalnate Pleso, and by Bob Stephens from GMARS joined in. It appears that we have a unique solution for Porb now. The current solution:
Pprim= 2.4497 +/-0.0002 h
Porb= 29.55 +/-0.03 h
Aprim= 0.17 mag
Depth of the events: 0.09 mag
Ds/Dp>= 0.29
http://www.asu.cas.cz/~asteroid/2754_all.png
http://www.asu.cas.cz/~asteroid/2754_longpc.png
http://www.asu.cas.cz/~asteroid/2754_shortpc.png
The events are well non-central, but it is not clear whether they are barely total or partial, hence the lower limit on Ds/Dp given. (More data during this apparition will be needed to resolve that.)

So, the discovery phase for this binary is nearly over.
There is another session of the last night (Aug 21) by Michal from Modra coming. It would be also good to improve the solution little bit by covering some orbital phases that have been covered poorly (no or poor coverage, with no overlap to other sessions) so far. And detecting one or a few more events in the process of completion of the coverage will be useful to refine an estimate of Porb as well. Therefore, I encourage you to obtain a few more sessions to complete it during the next few nights. Nevertheless, we are nearly ready to publish this one on a circular, we should do it later during this week, after taking last additional data to complete the points above.

Cheers, Petr [2006-08-21 14:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got data on two nightscut short by computer problems on 2006-08-19 and 2006-08-20. [2006-08-20 23:50, Santana]

· I should be picking this up at around 3:00, Aug19 UT.
Don [2006-08-19 00:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 20:15 UT. Michal [2006-08-18 21:26, Skalnate Pleso]

· Doing a run on this tonight.
Don [2006-08-18 01:53, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don has found this one to be a binary. His two long and one short sessions from Carbuncle Hill have revealed an apparently unique period of 2.450 h with superimposed attenuations 0.10-mag deep, one full and one partially covered. There are a few possible orbital periods; in the first two following pictures, I plotted the data with one of them:
http://www.asu.cas.cz/~asteroid/2754_all.png
http://www.asu.cas.cz/~asteroid/2754_longpc.png
http://www.asu.cas.cz/~asteroid/2754_shortpc.png

We need to catch a few more events so that to derive Porb uniquely. I encourage others here to help Don to cover it.

Cheers, Petr

PS: The IAU GA goes very well. I'll be away over the weekend, and I will attend to new data on Monday. There is a good chance that your data taken by Monday might already give a unique solution. [2006-08-17 19:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.
Don [2006-08-17 02:23, CarbuncleHill]

· It seems that there is the period 2.4 hours with 0.16 mag amplitude. [2006-08-16 11:17, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight. This will extend SkalnatePleso's run.
Don [2006-08-16 00:12, CarbuncleHill]

· Observing from 20:20 UT. Miso [2006-08-15 20:50, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· I'll be starting this one tonight.
Don [2006-08-13 02:16, CarbuncleHill]

(3121) Tamines (Finished) - return "prime suspect" [Add new note]
· This return "prime suspect" was done by Kamil and Peter K. from here: Good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/03121_b1.png
Done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2011-03-01 11:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Dear all, I will try to get relative long run from 20 to 04:30 UT tonight to finish this one. Best wishes, Kamil [2011-02-28 16:52, Ondrejov] Message sent to observers

· Peter K. took two short sessions for this "prime suspect", current solution (with the period fixed at the value estimated by David Higgins in 2008):
http://www.asu.cas.cz/~asteroid/03121_b1.png
The current amplitude is much lower than it was in 2008, see
http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm
that suggests that we see the asteroid at an aspect far from equatorial now. One or two sessions with duration of at least 4 hours and errors < 0.02 mag should complete the target for this apparition.

Clear Skies, Petr [2011-02-28 14:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 2:15 UT. Peter K. [2011-02-26 02:24, Ondrejov] Message sent to observers

· Observed for 3 hours last nigh. Target shows flat lightcurve with amplitude <0.05 mag. Peter K. [2011-02-23 12:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· David has taken four long nights for this one: Unique period, good coverage, no significant deviation. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-05-12 09:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-05-03 and 2008-05-04. Period refined to 4.042 +/- 0.002hrs with an amplitude of 0.16+/- 0.01

Data is somewhat noisy so I cannot rule out deviations. [2008-05-05 05:26, HuntersHill] Message sent to observers

· Observed 2008-04-29 from 11:19UT to 19:25UT in good conditions though cloud forced removal of last 40 minutes of data. Initial analysis shows a possible period of 3.8hrs with an unusually shaped curve. Amplitude appears to be 0.2 +/- 0.01mag. [2008-04-29 22:07, HuntersHill] Message sent to BinAstPhotSurvey conference

(99913) 1997 CZ5 (Finished) - binary [Add new note]
· The text of CBET 2648 on this binary is copied below, for your convenience. I have put a link to the CBET to the web pages.

(99913) 1997 CZ5
D. Higgins, Canberra, Australia; P. Pravec, P. Kusnirak, and K. Hornoch,
Ondrejov Observatory; J. Pollock, Appalachian State University; W. Cooney, J.
Gross, and D. Terrell, Sonoita Research Observatory, Sonoita, AZ, U.S.A.; J.
Oey, Leura, N.S.W., Australia; J. Brinsfield, Via Capote Observatory, Thousand
Oaks, CA, U.S.A.; and D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A.
LaCluyze, Physics and Astronomy Department, University of North Carolina,
Chapel Hill; and R. Durkee, Shed of Science Observatory, Minneapolis, MN,
U.S.A., report that photometric observations obtained during Jan. 8-30 reveal
that minor planet (99913) is a binary system with an orbital period of 14.68
hr. The primary shows a period of 2.83507 +/- 0.00002 hr, and it has a
lightcurve amplitude of 0.19 mag. Mutual eclipse/occultation events that are
0.033- and 0.042-magnitude deep indicate a secondary-to-primary mean-diameter
ratio of 0.19 +/- 0.02.

2011 February 3 (CBET 2648) Daniel W. E. Green

Monitoring of evolving events of this binary would be good. Errors about 0.01 mag, and certainly < 0.02 mag needed. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2- 6 10.72 0.250
2011- 2- 7 1.40 0.250
2011- 2- 7 16.09 0.250
2011- 2- 8 6.77 0.250
2011- 2- 8 21.46 0.250
2011- 2- 9 12.14 0.250
2011- 2-10 2.83 0.250
2011- 2-10 17.51 0.250
2011- 2-11 8.20 0.250
2011- 2-11 22.88 0.250
2011- 2-12 13.57 0.250
2011- 2-13 4.25 0.250
2011- 2-13 18.94 0.250
2011- 2-14 9.62 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 2- 6 18.05 0.750
2011- 2- 7 8.74 0.750
2011- 2- 7 23.42 0.750
2011- 2- 8 14.11 0.750
2011- 2- 9 4.79 0.750
2011- 2- 9 19.48 0.750
2011- 2-10 10.16 0.750
2011- 2-11 0.85 0.750
2011- 2-11 15.53 0.750
2011- 2-12 6.22 0.750
2011- 2-12 20.90 0.750
2011- 2-13 11.59 0.750
2011- 2-14 2.27 0.750
2011- 2-14 16.96 0.750

Clear Skies, Petr [2011-02-06 10:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by David from Hunters Hill, Peter K. from here, Joe with Prompt, Walt, John and Dirk from SRO, Jim from Via Capote, Russ from Shed of Science, and Julian from Leura joined in. The best fit solution to all sessions with the rms residuals < 0.020 mag:
P_1 = 2.83507 +/- 0.00002 h
P_orb = 14.685 h (error about 0.01 h)
http://www.asu.cas.cz/~asteroid/99913_11_p1.png
http://www.asu.cas.cz/~asteroid/99913_11_porb.png
As the events are so shallow, their depth can be best measured from sessions with the lowest noise; I have done it using data from the eight sessions that have rms residuals <= 0.010 mag (3 from Ondrejov, 2 from SRO, 1 from Via Capote, 1 from Prompt, and 1 from Hunters Hill):
http://www.asu.cas.cz/~asteroid/99913_11_porb_bestsessions.png
The measured depths of the event's bottoms are 0.033 mag (the 0.75-phase event) and 0.042 mag (the 0.25-phase event), giving D_2/D_1 = 0.19 +/- 0.02.

We are going to do a CBET announcement.

Cheers, Petr [2011-01-31 13:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2011-1-30 10:18UT to 17:43UT in reasonable conditions. Seem to have captured second half of 0.250 to first half of 0.750. Data sent to Petr and Peter K. [2011-01-31 01:21, HuntersHill] Message sent to observers

· Observed 2011-01-29 10:18UT to 17:40UT in good conditions. The 0.25phase event seems to be diminishing. Data sent to Petr and Peter K. [2011-01-30 01:47, HuntersHill]

· Began observing tonight at Prompt 0055 UT. Hope to get entire 0.250 phase event centered at 0240. Joe [2011-01-30 01:44, Dark Sky & PROMPT] Message sent to observers

· observed from 10UT 01/29 in good condition. phase 0.25 covered. [2011-01-29 21:47, Blue Mountains Obs]

· Working from SRO tonight. -Walt [2011-01-28 03:45, Sonoita] Message sent to observers

· Observed 2011-01-27 10:19UT to 18:00UT in less than ideal conditions. Session split by cloud (right in the middle of the 0.25 phase). [2011-01-27 21:27, HuntersHill]

· Observed 2011-01-25 10:29UT to 17:28UT in reasonable conditions. More than a dozen star subtractions and some light cloud/wind toward the end of the session. Covered the 0.75 phase event. [2011-01-26 00:35, HuntersHill] Message sent to observers

· Began observing tonight at Prompt 0055 UT. Hope to get entire 0.250 phase event centered at 0508. Observed last night under excellent conditions 0115-0824. Should have entire 0.750 phase event centered at 0706. Joe [2011-01-25 01:06, Dark Sky & PROMPT] Message sent to observers

· Observed 2011.01.23 10:27UT to 16:40UT in reasonable but diminishing conditions (cloud again). Caught part of an event. Data sent to Petr. [2011-01-24 01:51, HuntersHill]

· Began observing at Prompt 0115 UT. Hope to get entire 0.750 phase event centered at 0706. Joe [2011-01-24 01:15, Dark Sky & PROMPT] Message sent to observers

· Started observing around 4UT. Hoping to catch the first part of the 0.25 phase event. But clouds are approaching.

Russ [2011-01-23 05:03, Shed of Science]

· Observed from 2011-01-22 005:30 to 2011-01-22 12:00
significant moonlight artifact [2011-01-22 16:14, Via Capote] Message sent to observers

· New data added: 01-16.6 by Julian from Leura, 17.3 by Walt, John and Dirk from SRO, 17.5 by David from Hunters Hill, 18.0 by Kamil from here, and 18.4 and 19.4 by Jim from Via Capote. P_orb appears to be 14.7 h,
http://www.asu.cas.cz/~asteroid/99913_11_porb.png
http://www.asu.cas.cz/~asteroid/99913_11_p1.png
Data covering the 0.25-phase event are somewhat erratic, it may be a real behavior or observational problems. One or two more good sessions covering the event are needed before we announce this one on CBET. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2011- 1-22 18.38 0.250
2011- 1-23 9.07 0.250
2011- 1-23 23.76 0.250
2011- 1-24 14.45 0.250
2011- 1-25 5.14 0.250
2011- 1-25 19.83 0.250
2011- 1-26 10.52 0.250
2011- 1-27 1.21 0.250
2011- 1-27 15.90 0.250
2011- 1-28 6.59 0.250
2011- 1-28 21.28 0.250
2011- 1-29 11.97 0.250
2011- 1-30 2.66 0.250
2011- 1-30 17.35 0.250
2011- 1-31 8.04 0.250
2011- 1-31 22.73 0.250
2011- 2- 1 13.42 0.250
2011- 2- 2 4.11 0.250
2011- 2- 2 18.80 0.250
2011- 2- 3 9.49 0.250
2011- 2- 4 0.18 0.250
2011- 2- 4 14.87 0.250
2011- 2- 5 5.56 0.250
2011- 2- 5 20.25 0.250
2011- 2- 6 10.94 0.250
2011- 2- 7 1.63 0.250
2011- 2- 7 16.32 0.250
2011- 2- 8 7.01 0.250
2011- 2- 8 21.70 0.250
2011- 2- 9 12.39 0.250
2011- 2-10 3.08 0.250
2011- 2-10 17.77 0.250
2011- 2-11 8.46 0.250
2011- 2-11 23.15 0.250
2011- 2-12 13.84 0.250
2011- 2-13 4.53 0.250
2011- 2-13 19.22 0.250
2011- 2-14 9.91 0.250
2011- 2-15 0.60 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2011- 1-23 1.72 0.750
2011- 1-23 16.41 0.750
2011- 1-24 7.10 0.750
2011- 1-24 21.79 0.750
2011- 1-25 12.48 0.750
2011- 1-26 3.17 0.750
2011- 1-26 17.86 0.750
2011- 1-27 8.55 0.750
2011- 1-27 23.24 0.750
2011- 1-28 13.93 0.750
2011- 1-29 4.62 0.750
2011- 1-29 19.31 0.750
2011- 1-30 10.00 0.750
2011- 1-31 0.69 0.750
2011- 1-31 15.38 0.750
2011- 2- 1 6.07 0.750
2011- 2- 1 20.76 0.750
2011- 2- 2 11.45 0.750
2011- 2- 3 2.14 0.750
2011- 2- 3 16.83 0.750
2011- 2- 4 7.52 0.750
2011- 2- 4 22.21 0.750
2011- 2- 5 12.90 0.750
2011- 2- 6 3.59 0.750
2011- 2- 6 18.28 0.750
2011- 2- 7 8.97 0.750
2011- 2- 7 23.66 0.750
2011- 2- 8 14.35 0.750
2011- 2- 9 5.04 0.750
2011- 2- 9 19.73 0.750
2011- 2-10 10.42 0.750
2011- 2-11 1.11 0.750
2011- 2-11 15.80 0.750
2011- 2-12 6.49 0.750
2011- 2-12 21.18 0.750
2011- 2-13 11.87 0.750
2011- 2-14 2.56 0.750
2011- 2-14 17.25 0.750

Clear Skies, Petr [2011-01-20 08:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2011-01-19 005:30 to 2011-01-19 12:19
significant moonlight artifacts [2011-01-19 14:47, Via Capote] Message sent to observers

· Observed from 2011-01-14 005:34 to 2010-12-14 12:12
good conditions good seeing [2011-01-18 14:00, Via Capote]

· Observed 2011-01-17 from 11:01UT to 14:43UT interupted and terminated by cloud. [2011-01-18 03:15, HuntersHill] Message sent to observers

· Observing this one from 21:27 UT in variable conditions. Best wishes, Kamil [2011-01-18 00:25, Ondrejov]

· observed fromm 10:50 to 17:26 ut 01/16. [2011-01-17 20:09, Blue Mountains Obs] Message sent to observers

· Two new sessions added: 01-13.2 by Joe with PROMPT and 01-17.0 by Peter K. from here: Events with depth of 0.04 mag were seen on both nights. The solution for P_orb is still rather tentative:
http://www.asu.cas.cz/~asteroid/99913_11_porb.png
http://www.asu.cas.cz/~asteroid/99913_11_p1.png
more thorough coverage (long sessions with errors < 0.02 mag) are needed to nail it down.

Clear Skies, Petr [2011-01-17 12:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21:50 UT. Peter K. [2011-01-17 04:33, Ondrejov] Message sent to observers

· Hope to start a run at about 5:30 UT. -Walt [2011-01-17 03:32, Sonoita]

· Observing from 21:50 UT. Peter K. [2011-01-16 22:20, Ondrejov]

· The 01-13 data by Walt, John and Dirk from SRO joined in. While the P_1 component has been nailed down pretty well, the solution for the second component is tentative:
http://www.asu.cas.cz/~asteroid/99913_11_p1.png
http://www.asu.cas.cz/~asteroid/99913_11_porb.png
More long sessions are needed to establish it.

Clear Skies, Petr [2011-01-14 10:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Our actual run last night was from 05:30 UT to 12:15 UT. Hopefully we got some nice overlap with the Prompt data and extended the length of the series as well. -Walt [2011-01-14 02:09, Sonoita] Message sent to observers

· Began observations at 0200 UT from Prompt under good conditions. Joe [2011-01-13 04:47, Dark Sky & PROMPT]

· Will start a run from SRO at about 02:45 UT. -Walt [2011-01-13 02:36, Sonoita] Message sent to observers

· Began observations at 0200 UT from Prompt under good conditions. Got 6 hours last night. Joe [2011-01-12 04:46, Dark Sky & PROMPT]

· Began observations at 0200 UT from Prompt under good conditions. Joe [2011-01-11 02:22, Dark Sky & PROMPT] Message sent to observers

· David has sent me the following message with their new observations of 99913:
"Julian and I have taken on this target since it is a U=2. Julian has a partial night and I have a full night (albeit broken by cloud in the second half of the session). Brian Skiff did it last years and got a period of 2.833h. I get 2.85 BUT with a drift in brightness (dulling) over the duration of the session indicating a possible second period. The target seems to meet BINAST parameters so might be worth adding to your list since Julian and now are faced with a weeks worth of rain."

We have observed this Mars-crosser from Ondrejov in February 1997, got two short (2.9 and 1.5 h) sessions then. The data indicated a period of 3.01 h or 2.82 h (both giving about equally good fits, see
http://www.asu.cas.cz/~asteroid/99913.png )
With the Brian Skiff's data that David mentions and the David's data, it is nailed down to be the shorter period.

David mentions that his recent data showed a deviation. It may be due to a satellite, see
http://www.asu.cas.cz/~asteroid/99913_110108.png
More data (long sessions with errors not greater than 0.03 mag) are needed to confirm and establish a period of the deviations, so I encourage others to help out David with it.

Clear Skies, Petr [2011-01-09 10:46, Ondrejov] Message sent to BinAstPhotSurvey conference

(14133) 1998 RJ17 (Finished) [Add new note]
· Done by Julian from Leura: 5 nights, unique solution, a few small deviations but none suggesting binarity,
http://www.asu.cas.cz/~asteroid/14133.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2011-01-31 14:16, Ondrejov] Message sent to observers

· observed on 01/29 started from 10:08UT. Data loss from numerous background stars.
Both maxima covered. [2011-01-29 23:05, Blue Mountains Obs]

· observed on the 01/16 and 01/26 @ 10:30UT for about 7 hours. some data points were deleted due to numerous background stars. Period is 5.2402h [2011-01-28 00:33, Blue Mountains Obs] Message sent to observers

· Began observing 1998 RJ17 at 0300 UT from Prompt under good conditions. Should get ~5.5 hours. 11836 Eileen, a Mars crosser, is in the same field tonight. Objects pass less than 5 arc seconds apart at 0836 UT. Joe [2011-01-10 03:06, Dark Sky & PROMPT] Message sent to observers

· Started new target 11:13 12/30 UT and 10:46 12/31 UT. Period is 5.238h with large 1.2m amplitude. [2011-01-01 10:18, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(5999) Plescia (Finished) [Add new note]
· This one was done by Stefan and Jozef from Modra and by Peter K. from here: Unique period, double coverage, no deviation (other than the amplitude change between Jan. 4 and 16) seen:
http://www.asu.cas.cz/~asteroid/05999.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2011-01-17 13:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 23:30 UT. Jozef, Stefan. [2011-01-16 23:43, Modra]

· Observing from 17:45 UT and planning to do it for 3,5 hours. Peter K. [2011-01-16 17:43, Ondrejov] Message sent to observers

· Observed tonight under variable cloudiness. Data sent in.

Stefan/Jozef [2011-01-16 13:19, Modra] Message sent to BinAstPhotSurvey conference

· Nice curve: period/amplitude seems to be about 5.9h/0.85mag.

Stefan [2011-01-04 15:15, Modra]

· Observing this new target under variable conditions from 23:39 UT on Jan. 3, 2011.

Stefan [2011-01-04 01:55, Modra] Message sent to BinAstPhotSurvey conference

(4464) Vulcano (Finished) [Add new note]
· Suspect, but remains unconfirmed. More long, high quality sessions will be needed in future. Petr [2011-01-04 13:58, Ondrejov]

· Started a session at ~0:50UT.

Stefan [2010-12-30 04:38, Modra]

· Observed in night Dec. 27/28. Leos [2010-12-28 14:00, Modra]

· Observing it from 19:47 UT on Dec.18, 2010, under variable condition and moonlite.

Stefan [2010-12-18 20:10, Modra] Message sent to observers

· Observing it from 17:49 UT on Dec.16, 2010.

Stefan [2010-12-16 17:58, Modra] Message sent to BinAstPhotSurvey conference

· Brian has observed this one from PDO on four nights recently, found it to show two additive lc components:
http://www.asu.cas.cz/~asteroid/04464_p1.png
http://www.asu.cas.cz/~asteroid/04464_p2.png
It is a serious suspect for being a binary, but more data are needed i) to nail down the 2-additive periods solution, ii) to detect possible mutual events (there are one or two shallow features in the Brian's data that might be real attenuations, but they have to be confirmed with more data). I encourage you to help out Brian with long sessions with errors not greater than 0.02 mag.

Clear Skies, Petr [2010-12-14 15:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(5676) Voltaire (Finished) [Add new note]
· Great data in the third apparition: A solution of 5.04-h period (U = 2+ or 3-), multiple coverage, no significant deviation. Done for the 3rd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great work, guys.

Cheers, Petr [2010-12-14 10:02, Ondrejov]

· Observed 2010-12-10/12. Using Canopus CSS photometry I get a fit of 11.25hrs +/- 0.05hrs applying no deltaMag, 10.06hrs (same error) applying 0.03mag delta. Amplitude 0.06mag +/- 0.02mag [2010-12-13 08:09, HuntersHill] Message sent to observers

· observed from 11.21UT 2010-12-10 to 17.30UT. Good condition [2010-12-10 21:18, Blue Mountains Obs]

· Observed from 2010-12-10 03:10 to 2010-12-09 11:40
good conditions excellent seeing
Dm = .06
P~5.06h(10.1h possible) [2010-12-10 13:04, Via Capote] Message sent to observers

· Began observing from Prompt at 0040 UT under excellent conditions. Hope to get about 7.5 hours. Joe [2010-12-10 03:36, Dark Sky & PROMPT]

· Observed from 2010-12-09 04:00 to 2010-12-09 11:30
good conditions excellent seeing
Dm = .06
P~10.13h (5.04h possible)
low amp curve [2010-12-09 13:11, Via Capote] Message sent to observers

· Observed from 2010-12-08 05:26 to 2010-12-08 11:22
Dm = .06
P~4.8h
complex low amp curve [2010-12-08 13:52, Via Capote] Message sent to BinAstPhotSurvey conference

· This one remains an U=2 case: both 5.0392 and 10.074 h possible,
http://www.asu.cas.cz/~asteroid/05676_a9.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2009-08-05 13:36, Ondrejov] Message sent to observers

· In what I'm sure is only a short break in the multiple weeks of cloudy nights, I'm doing a short run on this one. Started at 02:00 UT.
Don [2009-07-11 02:06, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed 2009 05 29 from 10:35UT to 18:48UT in good conditions. The data is somewhat noisy with a lot of star subtractions. Low amplitude and nothing conclusive. [2009-05-30 01:29, HuntersHill] Message sent to observers

· Doing a short run on this starting at 04:00 UT.
Don [2009-05-21 02:30, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don took ten nights for this one from Carbuncle Hill, the last two accurately linked. Despite a very good quality of the data, they gave a double solution, both periods 5.040 and 10.081 h fit equally well; the low amplitude lightcurve with low features forbad to resolve the ambiguity.
http://www.asu.cas.cz/~asteroid/05676.png
We close it for the BinAstPhotSurvey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2007-01-04 14:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started around 23:30, Dec 21 ut.
Don [2006-12-22 00:56, CarbuncleHill]

· Started at 23:30, Dec 20 ut, in (do I dare say) excellent conditions.
Don [2006-12-21 01:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 23:30 ut, Dec 19, under very good conditions.
Don [2006-12-20 00:47, CarbuncleHill]

· Started at 02:15 ut.
Don [2006-12-19 02:24, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'm hoping for a long run on this tonight.
Don [2006-12-16 22:40, CarbuncleHill]

· Doing a run on this in a brief break in my perpetually cloudy weather. Hopefully, I'll get a few hours on it.
Don [2006-12-16 01:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this tonight.
Don [2006-12-12 01:02, CarbuncleHill]

· Started at ~00:00, Dec 11 ut.
Don [2006-12-11 00:18, CarbuncleHill]

· Started at 01:00ut in good conditions.
Don [2006-12-09 03:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at around 02:00 ut in good conditions. Clouds to the west may interfere.
Don [2006-11-26 03:13, CarbuncleHill]

· Starting this one tonight in good conditions.
Don [2006-11-25 03:59, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(2257) Kaarina (Finished) [Add new note]
· This "prime suspect", i.e., asteroid with P and A in the range of binaries, but with no events observed in a previous apparition, was covered with 3 nights by Gabo, Michal and Marek from Skalnate Pleso and 1 long night by Jim from Via Capote in the current apparition. Multiple coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/02257_b0.png
It is done for the 2nd apparition. The summary web page updated,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2010-12-08 08:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2010-12-07 03:10 to 2010-12-07 10:50
Dm = .17
P~3.042h
no deviation observed [2010-12-07 12:36, Via Capote] Message sent to observers

· Observing from 19:00 UT in average conditions. Michal [2010-11-15 21:49, SkalnatePleso] [Remove]

· Observed this object from midnight. Gabo [2010-10-29 14:59, SkalnatePleso] [Remove]
Message sent to observers

· This asteroid observed from cca midnight. Gabo [2010-10-27 15:59, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This one has been done well from Skalnate Pleso on six nights. Unique period, multiple coverage, no deviation:
http://www.asu.cas.cz/~asteroid/2257.png
Finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Marek et al.

Cheers, Petr [2006-11-21 14:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object observed from 16:58 UT to 03:16 UT, November 17/18. Gabo [2006-11-18 03:35, SkalnatePleso] [Remove]

· This object observed from 16:55 UT to 01:08 UT,November 16/17. Gabo [2006-11-17 01:29, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· All data catched by Gabo shows 3.0487 h period with the amplitude 0.13 mag. But 6.10 h period is strongly possible.
Marek [2006-11-16 09:27, SkalnatePleso] [Remove]

· This object observed from 21:42 UT to 03:24 UT, November 15/16. Gabo [2006-11-16 04:01, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 18:50 UT in average conditions. Michal [2006-11-07 18:54, SkalnatePleso] [Remove]

· This object observed from 21:40 UT to 03:55 UT, October 30/31. Gabo [2006-10-31 04:01, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This object observed from 21:32 UT to 03:53 UT, October 26/27. Gabo [2006-10-27 04:04, SkalnatePleso] [Remove]

(20691) 1999 VY72 (Finished) [Add new note]
· This one was done by Jim from Via Capote and Kamil from here: Unique period, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/20691.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2010-12-06 12:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 22:00 UT. Best wishes, Kamil [2010-12-04 22:03, Ondrejov] Message sent to observers

· Observing this one from 20:40 UT. Best wishes, Kamil [2010-12-03 23:51, Ondrejov]

· Observed from 2010-12-02 06:40 to 2010-12-01 12:00
Dm = .16
P~2.701h
possible deviation observed, conditions were worsening during the observation [2010-12-02 13:47, Via Capote] Message sent to observers

· Observed from 2010-12-01 06:45 to 2010-12-01 12:00
Dm = .14
P~2.721h
no deviations observed [2010-12-01 15:11, Via Capote] Message sent to BinAstPhotSurvey conference

(15700) 1987 QD (Finished) - Binary candidate [Add new note]
· Our announcement on this binary suspect has appeared on CBET 2540. I copy it belowe for your convenience.

Cheers, Petr

(15700) 1987 QD
R. Durkee, Shed of Science Observatory, Minneapolis, MN; P. Pravec, K.
Hornoch, and P. Kusnirak, Ondrejov Observatory; D. Pray, Carbuncle Hill
Observatory, W. Brookfield, MA, U.S.A.; V. Chiorny and V. Shevchenko, Kharkiv
Observatory; J. Oey, Leura, N.S.W., Australia; N. Gaftonyuk and Yu. Krugly,
Simeiz Observatory; D. Higgins, Canberra, Australia; J. Vilagi and S. Gajdos,
Modra Observatory; M. Husarik and M. Pikler, Skalnate Pleso Observatory; and
J. G. Ries, McDonald Observatory, University of Texas, report that photometric
observations obtained during Sept. 6-Oct. 13 reveal that minor planet (15700)
is a binary-system candidate. A primary rotation period of 3.0586 ± 0.0001
hr with a lightcurve amplitude of 0.07 mag was resolved. Superimposed to the
primary lightcurve were attenuations with depths 0.1-0.3 mag and durations up
to 3.5 hours that had shapes characteristic of mutual events in a binary
system. A conclusive solution for the orbit period was not obtained, however,
so this object remains a serious suspect for being binary, but confirmation
must come from future observations.

(C) Copyright 2010 CBAT
2010 November 6 (CBET 2540) Daniel W. E. Green [2010-11-08 15:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Extensive data for this binary candidate gave a unique value for P_1, but a solution for the orbital component remains unclear. We have not been able to fit the data together with one P_orb value; there always are at least two sessions that contradict any P_orb value. Two "best" P_orb solutions see below,
http://www.asu.cas.cz/~asteroid/15700_p1.png
http://www.asu.cas.cz/~asteroid/15700_porb50h.png
http://www.asu.cas.cz/~asteroid/15700_porb63h.png
We obviously don't get something right there.

Ok, as we don't have resolved the orbital component satisfactorily, this remains to be a binary candidate. Still it may be worth a CBET (and/or a MPB paper). Russ, as you were the first who detected an event there, you should be the first author. Feel free to write draft announcement and/or report on this one.

Petr [2010-11-01 09:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· we collected super-LOTIS observations for this target on
09-29-2010
10-01-2010
10-09-2010
10-10-2010
from Kitt Peak.
The data will be processed soon (2-3 days)
cheers
F. [2010-10-14 22:17, Marchis] Message sent to observers

· Observing from 18:30 UT in good conditions. Michal [2010-10-11 18:31, SkalnatePleso] [Remove]

· Super-LOTIS is back online... finally!
We have observations of this asteroid collected on 2010-09-29 and 2010-09-30 (starting at 2:40 UT). They will be processed and analysed next week. Thanks for your patience.
F. [2010-10-01 22:36, Marchis] Message sent to BinAstPhotSurvey conference

· New observations by Russ from Shed of Science and by Nelya from Simeiz have eliminated all by two values for P_orb, 50.3 and 63 hours, see
http://www.asu.cas.cz/~asteroid/15700_p1.png
http://www.asu.cas.cz/~asteroid/15700_porb.png
http://www.asu.cas.cz/~asteroid/15700_porb_a.png
For the longer period, there is a non-zero orbital eccentricity, which appears to be less usual but not impossible. We need to resolve between them with more observations. Below are events ephemerides for the two periods. Observations at times when there is predicted an event for one period but not for the other one should resolve between them right away.

P_orb = 50.35 h:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 9-30 5.50 0.250
2010-10- 2 7.85 0.250
2010-10- 4 10.20 0.250
2010-10- 6 12.55 0.250
2010-10- 8 14.90 0.250
2010-10-10 17.25 0.250
2010-10-12 19.60 0.250
2010-10-14 21.95 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010-10- 1 6.16 0.740
2010-10- 3 8.51 0.740
2010-10- 5 10.86 0.740
2010-10- 7 13.21 0.740
2010-10- 9 15.56 0.740
2010-10-11 17.91 0.740
2010-10-13 20.26 0.740
2010-10-15 22.61 0.740

P_orb = 62.95 h:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 9-30 18.12 0.200
2010-10- 3 9.07 0.200
2010-10- 6 0.02 0.200
2010-10- 8 14.97 0.200
2010-10-11 5.92 0.200
2010-10-13 20.87 0.200

Date/Time UTC (LTc.) Phase
--------------------------
2010- 9-29 16.31 0.790
2010-10- 2 7.26 0.790
2010-10- 4 22.21 0.790
2010-10- 7 13.16 0.790
2010-10-10 4.11 0.790
2010-10-12 19.06 0.790
2010-10-15 10.01 0.790

Clear Skies, Petr [2010-09-29 12:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a new run at about 2:30UT under very good conditions. Should be able to go until about 7UT. Assuming an orbital period of 50.4 hrs, my chances are good to catch the secondary attenuation.

Russ [2010-09-29 01:04, Shed of Science] Message sent to observers

· Starting again tonight at 2:30 UT. But conditions are not good. I may have to end after a few hours.

Russ [2010-09-28 02:19, Shed of Science]

· Weather looks good again tonight. I am following 15700 1987 QD from about 3UT to 7UT.

It is getting to be near my limit for quality photometry so I may only be able to follow it for a few more nights.

Russ [2010-09-27 03:51, Shed of Science] Message sent to observers

· Just started a run on this under moonlight, but I should have enough signal to detect events.

Russ [2010-09-26 03:43, Shed of Science]

· New good quality data by Don from Carbuncle Hill, David Higgins from Hunters Hill, Russ from Shed of Science, Jozef and Stefan from Modra, Kamil and Peter from here, and Nelya and Yura from Simeiz joined in. Two more events captured: by Don on Sept. 6 and by David on Sept. 17. Solution for the orbital period has to be nailed down with more data, currently there remains a few possible values with the shortest one of 50.4 h, see
http://www.asu.cas.cz/~asteroid/15700_porb.png
http://www.asu.cas.cz/~asteroid/15700_p1.png

I encourage all to contribute to nailing down this one with observations on nights when the moon will not interfere too much.

Clear Skies, Petr [2010-09-18 10:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will be observing this one tonight from 18:45 UT (weather permitting). Best wishes, Kamil [2010-09-17 16:52, Ondrejov] Message sent to observers

· Began run on 15700 at Prompt under good conditions at 2350 UT. Hope to observe until about 0830 UT. Joe [2010-09-14 00:13, Dark Sky & PROMPT]

· Russ has captured an attenutation before the end of his observations from Shed of Science Observatory on Sept. 12, see
http://www.asu.cas.cz/~asteroid/15700.png
http://www.asu.cas.cz/~asteroid/15700_100912_durkee.png

I encourage all to help out to cover this one to confirm the events and to establish their period.

Clear Skies, Petr [2010-09-13 11:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Conditions look good to start following this one again tonight starting at about 2:30 UT (Sep13).

Russ [2010-09-12 21:23, Shed of Science] Message sent to observers

· Observing this one starting ~19:00 UT. Jozef, Stefan. [2010-09-12 19:04, Modra]

· Starting on this one at about 2:30 UT

Russ [2010-09-12 02:10, Shed of Science] Message sent to observers

· Observing from 21:10 UT. Peter K. [2010-09-10 22:52, Ondrejov]

· Observing this one tonight starting at about 4UT.

Russ [2010-09-08 03:55, Shed of Science] Message sent to observers

· Observing the object for the rest of the night, supposing about 4 hours under nice moonlite.

Stefan/Jozef [2010-08-28 22:48, Modra]

· I got about 6 hours worth of data. The sky was clear, though bright due to the Moon.

Judit [2010-08-23 11:02, McDonald Observatory] Message sent to observers

· Three initial nights by Don of 2010 Aug 1, 6 and 8 gave a preliminary solution:
http://www.asu.cas.cz/~asteroid/15700.png
It can be also a different period or more complex. A few long sessions needed to nail down.

Clear Skies, Petr [2010-08-22 10:10, Ondrejov] Message sent to BinAstPhotSurvey conference

(88604) 2001 QH293 (Finished) [Add new note]
· Very good data for this paired asteroid:
http://www.asu.cas.cz/~asteroid/088604_b0.png
Cf. with data from the previous apparition taken by David Polishook from Wise:
http://www.asu.cas.cz/~asteroid/088604.png

Well done, guys.

Cheers, Petr [2010-10-19 13:04, Ondrejov]

· :-( The first images show that something is still bad here. So this asteroid is still not done. Adrian [2010-10-14 17:26, Modra] Message sent to BinAstPhotSurvey conference

· After a long while I can start with this tonight. Adrian [2010-10-14 16:50, Modra]

· Observing from 22:40 UT in good conditions. Michal [2010-10-11 22:45, SkalnatePleso] [Remove]
Message sent to observers

· Our telescope is temporarily down. At least one full coverage of the 7.2h period would be welcome. Jozef, Stefan. [2010-10-10 20:25, Modra]

· Observing tonight from 17:37. Jozef,Stefan. [2010-10-08 18:07, Modra]

· Observing this one from 19:28 UT. Jozef, Stefan. [2010-10-07 19:40, Modra]

· Observed in nights 22/23 september, 30/1 and 1/2 october. Standard sky conditions were only in 30/1.
Jozef, Stefan, Leos [2010-10-03 22:19, Modra] Message sent to BinAstPhotSurvey conference

(1344) Caubeta (Finished) [Add new note]
· Insufficient data for checking this "prime suspect" in this 2nd apparition. Closing it for the BinAstPhotSurvey. [2010-10-19 11:39, Ondrejov]

· Nelya and Yura took two short nights for this prime suspect in this 2nd apparition, see
http://www.asu.cas.cz/~asteroid/01344_b0.png
cf. with the 2009 data:
http://www.asu.cas.cz/~asteroid/01344.png

A couple more nights are needed to get a good coverage. I encourage others here to help out Nelya and Yura, if you can observe it with errors not greater than 0.03 mag when the moon is out of the way in a few days.

Clear Skies, Petr [2010-09-22 12:47, Ondrejov] Message sent to BinAstPhotSurvey conference

(10452) Zuev (Finished) [Add new note]
· This one has been worked extensively by Jozef and Peter V. from Modra, by Marek, Michal and Gabo from Skalnate Pleso, and by Vasilij from Kharkiv. Good solution with apparent changes due to the amplitude-phase effect:
http://www.asu.cas.cz/~asteroid/10452.png
http://www.asu.cas.cz/~asteroid/10452_1007_08.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2010-10-14 09:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 17:25 UT in a bit windy conditions with unstable further prediction. Michal [2010-10-09 17:32, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 17:20 UT in good conditions. Michal [2010-10-07 17:20, SkalnatePleso] [Remove]

· This object observed this night. Gabo [2010-10-06 16:44, SkalnatePleso] [Remove]
Message sent to observers

· My object this night from 19:00 UT. Gabo [2010-10-03 17:27, SkalnatePleso] [Remove]

· Observing from ~23:08 UT. Jozef, Peter. [2010-09-06 23:09, Modra]

· I will observe this object for few hours until the morning. Peter. [2010-09-05 23:29, Modra] Message sent to observers

· We tried to observe new object Zuev. The first estimate of a period is more than 5 hours with amplitude at 0.47 mag.
Marek and Michal [2010-07-22 07:54, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(14815) Rutberg (Finished) [Add new note]
· David's observations from Hunters Hill showed this one to be a slow rotator. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2010-09-30 08:06, Ondrejov] Message sent to observers

· Observed 2010-08-29/30 in average conditions cut short by cloud. Data linked via CSS processing reveals a possible period of approx 135hrs with an amplitude of 1.0mag [2010-08-31 07:14, HuntersHill]

· Observed 2010 08 08 in reasonable conditions. Data reveals a gradual decline in magnitude (0.05mag) over the 9hr observation window implying a period in excess of 36hrs. [2010-08-08 23:25, HuntersHill] Message sent to BinAstPhotSurvey conference

(35404) 1997 YV5 (Finished) [Add new note]
· Seven full or partial nights by David and by Jozef, Peter, Stefan and Leos for this one: Unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/35404.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2010-09-29 12:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2010 09 26 in reasonable conditions cut short by cloud. Data reveals 3 possible periods, Bimodal at 5.8196 or 5.8964 or tri peaked at 8.7296 +/- 0.0004 hrs. Neither Bimodel curve fit well so at this stage I am leaning toward the latter period. [2010-09-27 00:58, HuntersHill] Message sent to observers

· Observing from 18:56 UT. Jozef, Leos. [2010-09-22 19:19, Modra]

· Observing from ~20:55 UT. Jozef, Stefan. [2010-09-09 21:04, Modra]

· Observing tonight from ~20:06 UT, Jozef, Peter. [2010-09-06 21:16, Modra]

· Observing this candidate tonight. Bright sky, will see if it would last... [2010-09-05 19:37, Modra] Message sent to observers

· HHO has restricted observing capability but was able to obtain some data for this target. Limited data revels a period of 6.0 +/- 0.4hrs, amplitude of 0.35 +/- 0.02 mag in less than ideal conditions [2010-08-30 01:46, HuntersHill] Message sent to BinAstPhotSurvey conference

(6009) 1990 FQ1 (Finished) [Add new note]
· This prime suspect was done by Jozef and Leos from Modra on three nights Sept. 19.9 to 22.0: Unique period in agreement with the 2006 result, good coverage, no significant deviation.
http://www.asu.cas.cz/~asteroid/06009_b0.png
cf. with the 2006 data:
http://www.asu.cas.cz/~asteroid/06009.png
Done for the 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2010-09-22 12:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Planning to continue with this object tonight. Jozef, Leos. [2010-09-21 16:16, Modra] Message sent to observers

· Observed this new object for last two nights 19/20. and 20/21.9. Crude estimates of the basic LC parameters are P~4.85h and A~0.1mag. Leos, Jozef. [2010-09-21 14:55, Modra]

(3704) Gaoshiqi (Finished) [Add new note]
· Systematic deviations present, they may be another lc component, but no good solution. Needs to be established with more observations in the future.

Summary results put to
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2010-09-21 13:30, Ondrejov]

· Observed in excellent conditions from 0011-0716 UT on 08/30 from Prompt. Will attempt another run tonight. Joe [2010-08-30 21:31, Dark Sky & PROMPT] Message sent to observers

· Julian's extensive observations showed a weird behavior. More observations needed to hopefully get an understanding.

Clear Skies,

Petr [2010-08-22 09:25, Ondrejov]

· observed from 10.16 to 18.55UT 07/31. [2010-08-02 12:36, Blue Mountains Obs] Message sent to observers

· observed from 10:48UT to 19:21UT 07/17 in good condition. Period about 8h. [2010-07-18 11:19, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3833) Calingasta (Finished) [Add new note]
· Very nice data by Adrian et al. from Modra for this slow rotator (PAR = -2). Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Adrian.

Petr [2010-08-22 09:35, Ondrejov]

· It seems that the period is roughly 140 h with large amplitude of the lightcurve... Maybe there is no need to continue too much for the binast survey, though I do not know if it is a tumbler or not. Adrian [2010-07-09 21:28, Modra] Message sent to BinAstPhotSurvey conference

· Again the same plan as yesterday, but background stars do not cooperate well for the whole night photometry. BTW, brighter asteroid (1796) Riga is still in the FOV as yesterday, but I can hardly improve U=2 solution for the period derived by Brian, as the background stars are distributed against its photometry. Adrian [2010-07-08 21:58, Modra] Message sent to observers

· I plan to observe this target, though it seems to be a slow rotator. Hopefully background stars will not interfere too much. Adrian [2010-07-07 20:36, Modra] Message sent to BinAstPhotSurvey conference

· Observed tonight 21:45-01 UT. Leos, Jozef. [2010-06-29 01:21, Modra]

(32910) 1994 TE15 (Finished) [Add new note]
· This one has been done by Kamil and Peter from here and by Jozef, Leos and Stefan from Modra: Unique period, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/32910.png
Finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2010-08-16 15:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing it from 20:08 UT on Aug.12 under variable cloud cover.

Stefan/Jozef [2010-08-12 20:22, Modra] Message sent to observers

· Observing from 20:30 UT, weather looks favorable. Jozef, Leos. [2010-08-10 20:28, Modra]

· Observing from 20:15 UT and should get 6 hours long session. Peter K. [2010-08-09 21:23, Ondrejov] Message sent to observers

· I got short runs last and this night for this one. Best wishes, Kamil [2010-08-05 00:31, Ondrejov]

· Observed for almost 4 hours last night and planning to continue tonight. Peter K. [2010-07-31 15:47, Ondrejov] Message sent to observers

· Observed for 3.5 hours last night. Peter K. [2010-07-21 08:54, Ondrejov]

· I will start this new target on 22:00 UT. Best wishes, Kamil [2010-07-19 21:57, Ondrejov] Message sent to BinAstPhotSurvey conference

(7089) 1992 FX1 (Finished) [Add new note]
· This is a U = 2 solution:
http://www.asu.cas.cz/~asteroid/07089.png
Put to the pre-publication page:
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2010-07-19 11:08, Ondrejov]

· I tried to observe this target last night (Jun 11/12) but early clouds ruined my attempt. Data are useless. Peter K. [2010-06-12 17:20, Ondrejov] Message sent to observers

· I started a run on this at 03:15 UT.
Don [2010-06-09 03:27, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Kamil and Peter have worked this new target on four past nights, covered a 3.7-h interval on two of them and shorter intervals on the other two. An U=2 solution:
http://www.asu.cas.cz/~asteroid/07089.png
One long night with errors 0.01 mag is needed to increase a quality of the solution. As we cannot take it from here now, a help from another station would be appreciated.

Clear Skies, Petr [2010-06-08 07:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will try to continue with this one, if weather permit. Best wishes, Kamil [2010-06-07 20:08, Ondrejov] Message sent to observers

· Taking third night for this one. Peter K. [2010-06-06 22:11, Ondrejov]

· Observing this one from 20:45 UT in excellent conditions. Best wishes, Kamil [2010-06-05 22:47, Ondrejov] Message sent to observers

· I will start this new target tonight. Best wishes, Kamil [2010-06-04 19:03, Ondrejov] Message sent to BinAstPhotSurvey conference

(19982) Barbaradoore (Finished) [Add new note]
· This new target has been done well by Peter and Kamil from here: Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/19982.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2010-07-19 09:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 21:30 UT. Best wishes, Kamil [2010-07-16 21:57, Ondrejov] Message sent to observers

· Observed on second night for almost 4 hours. Peter K. [2010-07-11 02:23, Ondrejov]

· Observing from 22:30 UT. Peter K. [2010-07-09 23:52, Ondrejov] Message sent to BinAstPhotSurvey conference

(35062) Sakuranosyou (Finished) [Add new note]
· Apparently this is a slowish rotator as shown by the six nights by Don from Carbuncle Hill and one night by Jozef and Stefan from Modra,
http://www.asu.cas.cz/~asteroid/35062.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2010-06-29 13:18, Ondrejov]

· Started a run at 01:30 UT.
Don [2010-05-21 01:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 01:40 UT.
Don [2010-05-13 01:53, CarbuncleHill]

· Started a run at 02:20 UT.
Don [2010-05-11 02:23, CarbuncleHill]

· Observing this one tonight, starting from 20:46 UT. Jozef, Stefan. [2010-04-24 21:01, Modra]

· Plan to start a run at 03:10 UT.
Don [2010-04-24 01:32, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(15430) 1998 UR31 (Finished) - Binary suspect - more data needed to establish [Add new note]
· Two brightness drops seen in observations by Julian on 2010-05-06 and 07, but period not established.
http://www.asu.cas.cz/~asteroid/15430.png
Closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Needed to be established with future observations.

Petr [2010-06-25 13:13, Ondrejov]

· To all binast photometrist, I have obtained a number of nights data and although the primary period is known,the data was plaqued with possible instrumental problems. Could anyone please spare their observing time for this target to check if my data is real or otherwise? Good observing.. [2010-05-19 07:11, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 09:15UT05/08, 09:05UT05/09 , 09:27UT05/10 and 08:41UT05/11 for about 9 hours per session. Overall good condition [2010-05-12 05:53, Blue Mountains Obs] Message sent to observers

· observed from 09:13 to 18:33 UT 05/07. [2010-05-08 07:07, Blue Mountains Obs]

· finally a whole night of data obtained. Started at 10:22UT to 18:45UT 05/06. good condition. [2010-05-07 10:05, Blue Mountains Obs]

· observed from 10h 05/05 UT for 6 hours. good condition data sent in. [2010-05-06 06:07, Blue Mountains Obs]

· observed from 09:48h 05/04 UT for 3 hours. good condition but a few data points has to be eliminated due to proximity to a bright star(s). period is 2.402h [2010-05-05 00:07, Blue Mountains Obs] Message sent to observers

· New target started at 11:28UT 04/22 for 8 hours. Short period of 2.52h derived. [2010-04-23 12:38, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(11277) Ballard (Finished) [Add new note]
· Unsuccessfull observations. [2010-06-24 14:17, Ondrejov]

· Will be starting this new target at 05:15 UT.
Don [2010-06-09 03:32, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3888) Hoyt (Finished) [Add new note]
· Slow rotator, done sufficiently for the Survey,
http://www.asu.cas.cz/~asteroid/03888.png
Note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2010-06-24 12:23, Ondrejov]

· Observed tonight from 20:50 UT. Jozef, Stefan. [2010-06-07 00:57, Modra]

· Planning to observe 20:25-1:15 UT. Jozef, Stefan. [2010-06-05 19:51, Modra]

· Planning this one tonight. Jozef, Stefan [2010-06-04 20:16, Modra]

· Not sure, if my observations in cloudy weather could help. Adrian [2010-05-12 22:20, Modra] Message sent to BinAstPhotSurvey conference

· Observing from SRO tonight. Two nights at SRO already obtained indicate slow rotator. Peter's data also shows this. -Walt [2010-05-07 02:52, Sonoita] Message sent to observers

· Observing from 20 UT. Peter K. [2010-04-24 20:13, Ondrejov]

· Starting this one tonight from SRO. [2010-04-12 01:40, Sonoita] Message sent to BinAstPhotSurvey conference

(2287) Kalmykia (Finished) [Add new note]
· Solution unclear; unsuccessfull target. Petr [2010-06-24 11:49, Ondrejov]

· Observed 2010 04 21 in reasonable conditions. Low amplitude (less than 0.1mag). A small dip may indicate moderate period in the order of 12 hrs. [2010-04-24 13:12, HuntersHill] Message sent to observers

· observed from 11:14UT 04/22 for 8 hours and confirm the low amplitude nature of the object. period is probably about 8h and amplitude is 0.04m [2010-04-23 12:55, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed 2010 04 13 in reasonable conditions. Data reveals basically a flat line with only an 0.02mag, possibly cyclic variation in amplitude. [2010-04-15 07:00, HuntersHill]

(2261) Keeler (Finished) [Add new note]
· This slowish rotator was done well from four observatories:
http://www.asu.cas.cz/~asteroid/02261.png
Sufficient for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very good work, guys.

Cheers, Petr [2010-05-27 12:33, Ondrejov]

· Observing it from 19:50 UT under full Moon.

Stefan [2010-04-27 20:59, Modra] Message sent to observers

· Started this about 0300 UT (April 25).
Will send this data along with the merged set using data from Don and Russ.

Current solution indicates amplitude ~0.12 mag and period of 23.2 (monomodal). Double period requires too much fiddling with zero points. [2010-04-25 03:10, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Started a run on this at about 2:00 UT.

Additional data from Brian Warner suggests this object has a longish period.

Russ [2010-04-17 02:07, Shed of Science] Message sent to observers

· Started a run at 01:20 UT.
Don [2010-04-15 02:41, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run on this at 01:30 UT.
Don [2010-04-14 03:18, CarbuncleHill]

· Started another run on this target tonight at about 2:30UT under very good conditions.

Russ [2010-04-09 03:04, Shed of Science] Message sent to observers

· Started run about 2:30UT under good conditions.

Russ [2010-04-08 02:59, Shed of Science] Message sent to BinAstPhotSurvey conference

(18503) 1996 PY4 (Finished) [Add new note]
· This one has been done well by Don from Carbuncle Hill, Peter from here, and Jozef from Modra: unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/18503.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2010-05-24 11:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from ~21:00 UT. Jozef [2010-05-22 21:03, Modra]

· Plan to start a run at 05:15 UT.
Don [2010-05-21 01:38, CarbuncleHill]

· Plan to start a short run at 05:50 UT.
Don [2010-05-17 02:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(5333) Kanaya (Finished) [Add new note]
· Done in the 2nd apparition, 3 nights by David from Hunters Hill and 1 night by Joe with Prompt: Unique solution, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/05333_b0.png
Finished for this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2010-05-12 07:59, Ondrejov] Message sent to observers

· Began observing from Prompt 05/10-11/2010 at ~2315 UT. Excellent conditions. Hope to get 8-9 hours. Joe [2010-05-10 23:22, Dark Sky & PROMPT]

· Observed 2010 04 21 in reasonable conditions. Data reveals a possible deviation - certainly an untidy plot. [2010-04-24 13:10, HuntersHill] Message sent to observers

· Observed 2010 04 13 in reasonable conditions. Data reveals a period of 3.72hrs +/- 0.04 hrs with an amplitude of 0.15 +/- 0.02 mag [2010-04-15 06:57, HuntersHill] Message sent to BinAstPhotSurvey conference

· Hi David,
Yes, analysing the first three nights you sent to me while I was away and checking also your plot with the two additional nights (please send me them in due time so that I add them to the coverage database here), this one is well done and finished. I've put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
with a link to your web page.

Nice work!

Cheers, Petr [2006-01-02 12:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· 5th night completed. Once again nothing special noted and the period has been further refined. 3.8022hrs +/- 0.0008hrs.

I'm ready to call this one finished!

http://users.bigpond.com/higginsdj/5333kanaya.htm [2005-12-31 00:13, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced 5th night run on this target at 12:30UT [2005-12-30 12:46, HuntersHill]

· Data of limited use due to proximity and number of background stars. Did serve to refine the period slightly. Nothing new to note. [2005-12-30 02:39, HuntersHill] Message sent to BinAstPhotSurvey conference

· Starting a 4th night on this target 12:30UT. Conditions are very hot (23c midnight local), I have new control software (improved pointing) so am covering this target and new target (6084) Bascom. [2005-12-29 12:48, HuntersHill] Message sent to BinAstPhotSurvey conference

· 3rd night has refined the period. 3.8013hrs +/- 0.0012hrs with an amplitude of 0.22m +/- 0.02m. Nothing special noted in the curve and data has been sent to Petr for analysis to determine if the target is finished.

http://users.bigpond.com/higginsdj/5333kanaya.htm [2005-12-28 02:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· A much better session last night with higher SNR reveals a period of 3.794hrs +/- 0.005hrs with an aplitude of 0.24m +/- 0.02m.

http://users.bigpond.com/higginsdj/5333kanaya.htm [2005-12-26 02:29, HuntersHill] Message sent to BinAstPhotSurvey conference

· Initial review of data indicates a period around 3.4 hours with an amplitude of around 0.3mag. Things look good for another run tonight.

http://users.bigpond.com/higginsdj/5333kanaya.htm [2005-12-25 14:32, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced run at 12:45UT and completed run uninterupted at 17:20UT. Object is currently at magnitude 16 and in a relatively crowded field.

Merry Christmas all [2005-12-25 00:05, HuntersHill]

· Heavy cloud ended the session at 14:00 UT [2005-12-22 19:49, HuntersHill] Message sent to BinAstPhotSurvey conference

· This one rises at 13:00 UT for me. If the weather holds I should get a 4 hour run. [2005-12-22 14:20, HuntersHill]

(4899) Candace (Finished) [Add new note]
· Five linked nights by Don from Carbuncle Hill, supported with single nights by Peter from here and folks from Modra, revealed that it is a long period target,
http://www.asu.cas.cz/~asteroid/04899.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2010-05-05 07:29, Ondrejov]

· Plan to start a run at 02:15 UT, along with linkage images.
Don [2010-04-24 01:21, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Planning to start a run at about 02:30 UT.
Don [2010-04-20 02:05, CarbuncleHill]

· Observing from 20:45 UT. Peter K. [2010-04-19 20:46, Ondrejov] Message sent to observers

· Will start a run at 03:05 UT.
Don [2010-04-15 02:43, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this new target at 03:20 UT.
Don [2010-04-14 03:22, CarbuncleHill]

(5527) 1991 UQ3 (Finished) [Add new note]
· Don and David have done this one on three nights from Carbuncle Hill and Hunters Hill: Unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/05527.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2010-04-23 09:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Worked by Don and David. [2010-04-23 09:16, Ondrejov]

(4008) Corbin (Finished) [Add new note]
· This one has been done well by Adrian, Jozef, Peter V. and Stefan from Modra and by Don from Carbuncle Hill: Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/04008.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2010-04-23 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 19:15 UT. Jozef, Stefan. [2010-04-22 21:15, Modra]

· Started another run at 19:20 UT. Jozef, Peter. [2010-04-21 19:33, Modra]

· Started this at about 01:40 UT.
Don [2010-04-21 02:52, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Planning this one tonight, weather permitting
Jozef, Peter [2010-04-20 18:56, Modra] Message sent to observers

· Started a run on this at 02:00 UT.
Don [2010-04-20 02:07, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a session at ~19:50 UT, weather seems favourable. Jozef, Peter. [2010-04-19 20:32, Modra]

· Peter Veres could add also a short session of this object and P seems to be 2.76 h. Adrian [2010-04-18 09:54, Modra] Message sent to observers

· As 1830 is not high above horizon here now (BTW, it was observed in variable conditions) I can add a short session for any object. I am choosing this one. Well, 4142 is also in the FOV, but its period is known (and long) so this session will probably not help. Adrian [2010-04-17 00:22, Modra] Message sent to BinAstPhotSurvey conference

· Started this target at 02:05 UT.
Don [2010-04-15 02:44, CarbuncleHill]

(25884) 2000 SQ4 (Finished) - Paired asteroid [Add new note]
· Well done from Modra:
http://www.asu.cas.cz/~asteroid/025884.png

Cheers, Petr [2010-04-22 12:29, Ondrejov]

· Five nights from Modra taken during 2010-03-08 to 21 gave a good unique solution for this paired asteroid. Its parameters are in a perfect agreement with our theory of binary separation presented in our recently submitted paper.
http://www.asu.cas.cz/~asteroid/025884.png
One full lightcurve in April would be useful to prolong the observed arc for future modeling.

Clear Skies, Petr [2010-03-24 15:14, Ondrejov]

· Observed 20/21.3. Leos [2010-03-21 14:36, Modra] Message sent to observers

· Observing from 19:20 UT. Jozef, Leos. [2010-03-09 23:07, Modra]

· Observed 7/8.3. and 8/9.3. Leos, Jozef [2010-03-09 14:49, Modra] Message sent to BinAstPhotSurvey conference

(8033) 1992 FY1 (Finished) [Add new note]
· This one has been done by Don from Carbuncle Hill, Kamil from here, and Jozef from Modra: Good solution and coverage, no prominent deviation,
http://www.asu.cas.cz/~asteroid/08033.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2010-04-13 15:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:00 UT.
Don [2010-04-12 02:36, CarbuncleHill]

· Started a second run on this at 02:30 UT.
Don [2010-03-25 02:29, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(34708) 2001 OG95 (Finished) [Add new note]
· Unsuccessfull, closing it. [2010-03-24 15:18, Ondrejov]

· In more than 9hours no reliable variation seen. Jozef, Leos [2009-12-29 14:22, Modra]

· Observing a new object tonight. Jozef, Leos. [2009-12-28 20:13, Modra]

(29729) 1999 BY1 (Finished) [Add new note]
· It is a U = 2 solution and incomplete coverage, insufficient for the BinAstPhotSurvey. Closing it. [2010-03-24 15:17, Ondrejov]

· Nice data from 2010-01-09, Julian and David. A second night will be needed to complete double coverage (and maybe a third one to get a unique solution over the whole arc beginning on January 9).
http://www.asu.cas.cz/~asteroid/29729.png

Clear Skies, Petr [2010-01-27 09:22, Ondrejov] Message sent to observers

· Observed on 2010-01-09 too to compliment david's results. I will discontinue my observation of this target in favour of others. [2010-01-12 13:09, Blue Mountains Obs]

· Observed 2010-01-09 in hot conditions. Unexplained gap in the data but plot reveals a period of 4.6hrs with an amplitude of not less than 0.6mag [2010-01-10 07:44, HuntersHill] Message sent to BinAstPhotSurvey conference

(8373) Stephengould (Finished) - Binary [Add new note]
· Yura has already circulated it among co-authors, but I have to forward it also here.

Cheers, Petr

(8373) STEPHENGOULD
Yurij N. Krugly, Institute of Astronomy, Kharkiv National University;
R. Behrend, Geneva Observatory; P. Pravec, K. Hornoch, and P. Kusnirak,
Ondrejov Observatory; A. Galad and P. Veres, Modra Observatory; R. Crippa,
Fondazione Observatorio Astronomico di Tradate, Tradate, Italy; F. Manzini,
Stazione Astronomica di Sozzago, Italy; M. Audejean, Chinon, France; L.
Bernasconi, Les Engarouines, France; N. Gaftonyuk, Simeiz Observatory; B. D.
Warner, Palmer Divide Observatory and Space Science Institute, Colorado
Springs, CO, U.S.A.; and I. Molotov and L. Elenin, Keldysh Institute of
Applied Mathematics, Moscow, report that photometric observations obtained
during 2010 Jan. 16-Feb. 6 reveal that minor planet (8373) is a binary
system with an orbital period of 34.15 +/- 0.1 hr. The primary showed a
period of 4.4345 hr with a lightcurve amplitude of 0.33 to 0.39 mag.
Earlier observations in this apparition taken on 2009 Nov. 30 and Dec. 22
showed a lower primary amplitude of 0.18 and 0.28 mag, respectively; the
amplitude changes were likely caused by changes of the illumination and
viewing aspect of the minor planet. Mutual eclipse/occultation events
observed during Jan. 17-Feb. 1 indicate a lower limit on the secondary-to-
primary mean-diameter ratio of 0.27. The events were more shallow on Feb.
4 and 6; a possible cause is that the system was moving away from the
eclipse geometry. Measured color indices in the Johnson-Cousins system:
B-R = 1.20 +/- 0.043, V-R = 0.435 +/- 0.041, R-I = 0.43 +/- 0.045. The
calibrated data of Jan. 17 give the mean absolute magnitude as H_R = 14.2
+0.3/-0.4, assuming G = 0.2 +/- 0.2. Re-examination of 2004 observations
by Warner (Minor Planet Bull. 31, 67) shows what appears to be an event
that was overlooked in the original analysis. Since only one event was
captured (2004 Jan. 9), it is not possible to determine the orbital period
from the 2004 data. Images of some nights were co-added for up to 15
kiloseconds equivalent exposures (0.6-m class telescopes); there is no
sign of cometary activity for this object.

2010 March 4 (CBET 2193) Daniel W. E. Green [2010-03-07 14:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 17:25 UT. Best wishes, Kamil [2010-02-03 18:45, Ondrejov] Message sent to observers

· Observing this one from 17:03 UT. Best wishes, Kamil and Peter [2010-01-26 17:12, Ondrejov]

· Observed on Jan 24 at 19:00 to cover 0.75 phase.
Marek & Miso [2010-01-25 11:25, SkalnatePleso] [Remove]
Message sent to observers

· Started at 16h UT in good condition.
Yura [2010-01-25 13:53, Kharkiv]

· We are having a nice observing streak since 19:00 UT despite the bright Moon and some approaching clouds. Hope that we may follow the target until 4:00 UT.
Peter V. [2010-01-23 23:14, Modra] Message sent to observers

· Obtained 4 hour in end of last night (0h-4h UT, with some small clouds) and began this night at 15:30 UT. The weather is good and some cold. Hope to continue with it up to 4h UT.

Yura [2010-01-23 17:17, Kharkiv] Message sent to observers

· So let's try this MC tonight from here :-). Adrian [2010-01-22 16:30, Modra]

· Yura has observed this asteroid with an iteresting orbit from Kharkiv on two nights Jan. 17.9 and 18.9, he found it to show a main period of 4.435 h and superimposed attenuations that appear to be mutual events in a binary system. The orbital period appears to be 33.8 h or twice that.
http://www.asu.cas.cz/~asteroid/08373_p1.png
http://www.asu.cas.cz/~asteroid/08373_porb.png

More observations are needed to nail it down, I encourage you to help out Yura with it. Events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2010- 1-22 16.74 0.250
2010- 1-24 2.54 0.250
2010- 1-25 12.34 0.250
2010- 1-26 22.14 0.250
2010- 1-28 7.94 0.250
2010- 1-29 17.74 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2010- 1-23 9.62 0.750
2010- 1-24 19.42 0.750
2010- 1-26 5.22 0.750
2010- 1-27 15.02 0.750
2010- 1-29 0.82 0.750

Clear Skies, Petr [2010-01-22 12:53, Ondrejov] Message sent to BinAstPhotSurvey conference

(17152) 1999 JA118 (Finished) [Add new note]
· This one has been done by Don from Carbuncle Hill and by Jim from Via Capote on 7 nights: Unique solution, multiple coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/17152.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2010-02-18 09:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· plan to start run at 09:00 UT to complete full coverage [2010-02-15 04:08, Via Capote] Message sent to observers

· period is approximately 9.45 hours amplitude approximately .20 mag [2010-02-14 14:44, Via Capote]

· plan to start run at 07:00 UT [2010-02-14 04:30, Via Capote] Message sent to observers

· long session with apparent complete coverage Lightcurve is ambiguous with my data and suggests a period of around 8 hours amplitude of about .24 mags [2010-02-13 14:27, Via Capote]

· Plan to start run at 04:00 UT [2010-02-13 00:52, Via Capote] Message sent to observers

· Plan to start a run at 02:05 UT.
Don [2010-02-07 00:41, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Plan to start a run at 03:20 UT.
Don [2010-01-24 02:33, CarbuncleHill]

· Started a second night on this at 03:20 UT.
Don [2010-01-23 03:58, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(189099) 2001 RO (Finished) [Add new note]
· This one has been done well from Carbuncle Hill, Via Capote and Skalnate Pleso: Unique solution (or almost so; it may be rated U = 3- as period twice as long cannot be formally ruled out, but is unlikely as it would have little or no signal in odd harmonics), good coverage, no prominent deviations seen,
http://www.asu.cas.cz/~asteroid/189099.png
We consider it closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2010-02-11 15:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· third and final session on target begun at UT 04:00 all data submitted [2010-02-08 13:37, Via Capote] Message sent to observers

· Plan to start a run at 01:20 UT.
Don [2010-02-07 00:40, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Nice data, Don, Marek and Dusan, they give a unique period.
http://www.asu.cas.cz/~asteroid/189099.png
One more session is needed to complete coverage.

Clear Skies, Petr [2010-01-27 09:32, Ondrejov]

· Started a run at 02:30 UT.
Don [2010-01-24 02:32, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 02:30 UT.
Don [2010-01-23 03:55, CarbuncleHill]

· This one was observed on Jan 15 at 22:30 UT about 4 hrs. First data shows a half of lightcurve, so we assume tha full period could be 8 hrs.

Marek & Dusan [2010-01-19 12:41, SkalnatePleso] [Remove]
Message sent to observers

· Started this new target at 03:00 UT.
Don [2010-01-15 03:01, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(6097) Koishikawa (Finished) [Add new note]
· This one has been done well from the four stations on six nights: Unique solution, multiple coverage, no deviation,
http://www.asu.cas.cz/~asteroid/06097.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2010-02-11 12:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· started run at UT 03:40 under good conditions [2010-02-09 03:41, Via Capote]

· Started a run at 00:40 UT.
Don [2010-02-07 00:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing at Prompt tonight (01/16-17/2010). Reduction of first 4 hours from 0120-0530 UT shows a clear period of ~2.95 hours with an amplitude of ~0.13 magnitudes. Joe [2010-01-17 07:11, Dark Sky & PROMPT] Message sent to observers

· Observed 2010-01-09 in hot conditions. An unexplained gap in the data. Data reveals a bimodal curve at 1.78hrs with an amplitude of 0.14 +/- 0.03mag, unlikely but that's all that fits at the moment. [2010-01-10 07:48, HuntersHill] Message sent to BinAstPhotSurvey conference

(15607) 2000 GA124 (Finished) [Add new note]
· This "prime suspect" (i.e., asteroid with P and A in the binaries zone, but not showing signs of a binary character itself) has been done in this 2nd apparition by Don from Carbuncle Hill and by Peter V. from Modra: Unique solution (refining the David Higgins' estimate from October 2005), good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/15607_a9.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don and Peter.

Cheers, Petr [2010-01-09 13:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting a 4 hour session (decent weather cond.)
Peter Veres [2009-12-14 21:53, Modra] Message sent to observers

· Plan to start at 00:40, Dec 13 UT.
Don [2009-12-12 23:37, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Planning to start a run at 00:50, Dec-11 UT.
Don [2009-12-10 23:01, CarbuncleHill]

· Plan to start a run at 02:20 UT.
Don [2009-11-23 02:17, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Plan to start a run at 02:30 UT.
Don [2009-11-22 02:08, CarbuncleHill]

· Plan to start this at 02:30 UT.
Don [2009-11-21 00:49, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· The solution for this object is reasonably secure (U=3-), more than double coverage with no deviation seen in good data points, so we may call it finished for the Survey. (David may take a few more data in the upcoming lunation, depending on his other targets.)
I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-10-19 07:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Obtained data from a 7.5 hour session that was interuped by fast moving, low level cloud and combined with the moon SNR's are not as low as I would have liked but there is enough data to determine a reliable period.

http://users.bigpond.com/higginsdj/15607-2000GA124.htm [2005-10-15 02:59, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced another night on the target (probably the last night for this lunation). Conditions may hold and allow a full 6 hour run. [2005-10-14 12:08, HuntersHill]

· Well another night cut short by cloud but its possible I have sufficient data to get a U=2 estimate of the objects period. Data too 'wild' for anything else.

http://users.bigpond.com/higginsdj/15607-2000GA124.htm

The target may still be in scope for the beginning of the next lunation [2005-10-12 13:51, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started this target last night but the session was cut very short by cloud. Having another go tonight but this time under full auto (unattended) [2005-10-12 12:08, HuntersHill]

(6181) Bobweber (Finished) [Add new note]
· The 0.03-mag deep attenuation observed by Jozef and Peter V. around 2009 Nov. 18.77 has not been captured more. Since its depth is under the nominal limit of the BinAstPhotSurvey, we take this one as a binary non-detection within the Survey.
http://www.asu.cas.cz/~asteroid/06181.png
Closed for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great efforts all attempting to establish this marginal binary candidate.

Cheers, Petr [2010-01-09 13:37, Ondrejov] Message sent to observers

· Just started a run at SRO tonight. -Walt [2009-12-26 02:49, Sonoita]

· Started run at about 1:30 UT.

Russ [2009-12-15 02:06, Shed of Science]

· Started a run at 22:45 UT.
Don [2009-12-12 23:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· After many weeks of cloudy weather, looks like I have a good clear night to follow this one. Will start at about 01UT.

Russ [2009-12-11 00:21, Shed of Science] Message sent to observers

· Started this at 22:55.
Don [2009-12-10 22:58, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed 28/29.11.2009 16:20 - 00:40 UT. Leos [2009-11-30 16:07, Modra] Message sent to observers

· I may try this as yesterday, but the weather here is unpredictable. Adrian [2009-11-26 16:52, Modra] Message sent to BinAstPhotSurvey conference

· Started a run at 23:45 UT.
Don [2009-11-22 23:46, CarbuncleHill]

· Started at 00:30 UT.
Don [2009-11-22 00:32, CarbuncleHill]

· Finished due to fog. Jozef, Stefan. [2009-11-22 00:00, Modra]

· Will work from SRO tonight. -Walt [2009-11-21 23:16, Sonoita] Message sent to observers

· Surrounded by fog, started at ~17:30 UT. Jozef, Stefan [2009-11-21 17:31, Modra]

· Started a run at 00:15 UT
Don [2009-11-21 00:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Interrupted by fog at ~20.30 UT, that's it for tonight, probably. Jozef, Stefan [2009-11-20 20:59, Modra]

· Observing from ~17 UT, until the weather holds. Jozef, Stefan. [2009-11-20 17:05, Modra]

· Observations by Don from Carbuncle Hill and by Jozef, Peter V., Leos, and Stefan from Modra have established a period of 2.758 h for this one. Jozef and Peter have captured what appears to be a 0.03-mag deep event in their night 2009-11-18.9.
http://www.asu.cas.cz/~asteroid/06181.png
http://www.asu.cas.cz/~asteroid/06181_091118.png
More observations are needed to confirm this binary candidate by capturing more events and establishing their period. I encourage northern hemisphere observers to collaborate with Jozef et al. and Don on this one. Data with errors about 0.01 mag are needed as the detected event is shallow.

Clear Skies, Petr [2009-11-19 22:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from ~17 UT. Jozef, Stefan [2009-11-19 17:50, Modra] Message sent to observers

· Planning this one tonight. Jozef, Peter. [2009-11-18 16:15, Modra]

· Started a run at 01:50 UT.
Don [2009-11-18 02:46, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 20:45 UT. Peter Veres, Leos [2009-11-14 01:26, Modra] Message sent to observers

· Started a run on this new target at 00:50 UT.
Don [2009-11-08 03:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3695) Fiala (Finished) [Add new note]
· Unsuccessful; linked good quality observations in a future apparition will be needed to establish. Petr [2010-01-09 13:13, Ondrejov]

· Observing this one from 18:39 UT. Best wishes, Kamil [2009-12-15 19:21, Ondrejov] Message sent to observers

· Observed 2009-12-05 in fair conditions. Target appears to be somewhat fainter than the predicted 16.0mag. Data reveals a possible period of 4.1hrs. However, give a small amplitude (0.1mag) and plot error of 0.05mag it's hard to tell. [2009-12-06 07:02, HuntersHill] Message sent to BinAstPhotSurvey conference

(57083) 2001 OM31 (Finished) [Add new note]
· This one has been done well by Joe with Prompt and by David from Hunters Hill: Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/57083.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys!

Cheers, Petr [2010-01-05 09:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed at Prompt 0120-0840 UT 12/31. Joe [2010-01-01 04:05, Dark Sky & PROMPT] Message sent to observers

· Observed 2009-12-18 in reasonable conditions. Data reveals a period of 3.48 +/- 0.03 hrs with an amplitude of 0.45 +/- 0.02mag. [2009-12-19 01:00, HuntersHill] Message sent to BinAstPhotSurvey conference

(7741) Fedoseev (Finished) [Add new note]
· David has observed this one from Hunters Hill on six nights, revealed that it is a slowish rotator. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-12-17 09:06, Ondrejov] Message sent to observers

· Observed 2009-12-07, 09 and 12 in poor to reasonable conditions. Relatively short sessions only. Data reveals a possible period of 14.068 +/- 0.004hrs with an amplitude of 0.12 +/- 0.03mag. Still haven't closed the curve so can only rate it a quality of 2. [2009-12-13 02:56, HuntersHill] Message sent to observers

· Observed 2009-12-05 in fair conditions. Data reveals a possible period of 10.3 +/- 0.1 hrs with and amplitude of 0.16 +/- 0.03 mag. I still haven't closed the curve. [2009-12-06 06:56, HuntersHill]

· Observed 2009-10-13 in good conditions. Data indicates a period in excess of 14hrs, probably longer with an amplitude of 0.16 +/- 0.002 mag. Data appears to cover all or part of a minima. [2009-11-13 23:32, HuntersHill] Message sent to BinAstPhotSurvey conference

(56048) 1998 XV39 (Finished) - Paired Asteroid [Add new note]
· Tough target, unsuccessfull. [2009-12-16 14:36, Ondrejov]

· Tried this one again on Dec 7, but the field was extremely crowded, so I got nothing useful.
Don [2009-12-10 23:06, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this last night under variable conditions. Doing a second run tonight starting at 02:10 UT.
Don [2009-11-18 02:43, CarbuncleHill]

(9584) Louchheim (Finished) - slow rotator [Add new note]
· Don and Adrian et al. have done this slow rotator: P = 410 h (U = 2),
http://www.asu.cas.cz/~asteroid/09584.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the tough target.

Petr [2009-12-15 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed two consecutive linked nights. 38 points 8/26 0220-0940 UT and 35 points 8/27. Joe [2009-08-27 15:11, Dark Sky & PROMPT] Message sent to observers

· I started a run on this at 02:55 UT.
Don [2009-08-27 03:57, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Marek's observations from S. Pleso didn't show a prominent variation on any of the two nights,
http://www.asu.cas.cz/~asteroid/09584.png
It may be low amplitude or long period. It would be good to resolve between the two cases, so if someone can take linked data on two nights (only a few points per night is needed, so this can be a secondary target to be worked in addition to a primary target of the night), it will be useful.

Clear Skies, Petr [2009-08-21 12:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Last night shows no change. Amplitude of LC is very low < 0.03 mag, or we can say flat. I assume that the 3 h period could be wrong. In the LC there is no trend of decrease/increase.
Marek [2009-08-21 11:28, SkalnatePleso] [Remove]
Message sent to observers

· I observed this one last night Aug 19. I try it again tonight. The first data shows period at 3 hours but amplitude is low at 0.03 mag.
Marek [2009-08-20 21:01, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(2513) Baetsle (Finished) [Add new note]
· This asteroid was observed by Don Pray (5 nights ) and by Walt Cooney (SRO, 1 night) from Nov 19 to Dec 07. Their observations revealed unique period of 6.079 h with sufficient coverage and no deviations.

http://www.asu.cas.cz/~asteroid/02513.png

Target is finished for our Survey. Peter K. [2009-12-10 09:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Worked from SRO last night. -Walt [2009-11-27 15:20, Sonoita] Message sent to observers

· Started a run at 00:45 UT.
Don [2009-11-23 00:44, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 02:00 UT
Don [2009-11-22 02:07, CarbuncleHill]

· Started this one on Nov 19, and doing another run tonight starting at 01:10 UT.
Don [2009-11-21 03:44, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(26416) 1999 XM84 (Finished) - Paired asteroid [Add new note]
· Unsuccessfull, some short-period variations seen, but no clear solution. Petr [2009-11-20 20:14, Ondrejov]

· Started at 01:45 UT.
Don [2009-10-20 02:10, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 00:30 UT with a slight haze that should diminish.
Don [2009-10-15 00:34, CarbuncleHill]

· Start on (26416) 1999 XM84 at Pic du Midi at 18h30UT
until 3UT. yesterday data were not so good due to high
clouds. I work on it.

Francois [2009-10-14 18:29, Pic du Midi] Message sent to BinAstPhotSurvey conference

· Started this one at 01:35 UT, and should run until 07:00 UT. Conditions are a little breezy.
Don [2009-10-14 01:46, CarbuncleHill]

· Start on (26416) 1999 XM84 at Pic du Midi on Oct 13 from 18h30 UT to 3UT

Francois [2009-10-13 18:50, Pic du Midi] Message sent to observers

· First night by Don:
http://www.asu.cas.cz/~asteroid/026416.png
A couple full nights could do it.

Clear Skies, Petr [2009-09-03 09:24, Ondrejov]

· Started this one at 03:45 UT.
Don [2009-08-27 03:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(1509) Esclangona (Finished) - two periods [Add new note]
· Our announcement on the detection of two rotational periods in this binary has appeared in CBET 2020. I'm copying it below for your convenience.

Great work all!

Cheers, Petr

(1509) ESCLANGONA
B. D. Warner, Palmer Divide Observatory and Space Science Institute,
Colorado Springs, CO; P. Pravec and P. Kusnirak, Ondrejov Observatory; A.
W. Harris, Space Science Institute, La Canada, CA; R. Durkee, Shed of
Science Observatory, Minneapolis, MN; R. D. Stephens, Goat Mountain Research
Station, Landers, CA; M. Husarik and M. Pikler, Skalnate Pleso Observatory; F.
Marchis and A. E. Reiss, SETI Institute and University of California at
Berkeley; J. Vilagi, S. Gajdos, and L. Kornos, Modra Observatory; W. Cooney,
J. Gross, and D. Terrell, Sonoita Research Observatory, Sonoita, AZ; and F.
Vachier, Institut de Mecanique Celeste et de Calcul des Ephemerides,
Observatoire de Paris, report that photometric observations of minor planet
(1509) obtained during Sept. 9-Oct. 27 reveal two distinct periods:
3.25285 ± 0.00002 and 6.6423 ± 0.0003 hr. The lightcurve components
associated with two periods are linearly additive and have amplitudes of
0.13 and 0.04 mag, respectively. It appears likely that these two lightcurve
components are due to the rotations of the primary and secondary, respectively,
of the wide binary reported in 2003 by Merline et al. (IAUC 8075). The
separation of the two objects observed by Merline et al. is so large that
catching mutual events (occultations and/or eclipses) is unlikely. Previous
CCD observations (Warner 2005, Minor Planet Bull. 32, 54-58) did not show any
indications of a secondary period or mutual events.

2009 November 16 (CBET 2020) Daniel W. E. Green [2009-11-17 01:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· With the really abundant dataset we have for this one now, I have turned to search for a possible second period in the data. And there indeed turned out to be a clear second period present, 6.6418 h (assuming bimodal shape). See lightcurve components of the two periods:
http://www.asu.cas.cz/~asteroid/01509_09_p1.png
http://www.asu.cas.cz/~asteroid/01509_09_p2.png
and a noise spectrum for P_2:
http://www.asu.cas.cz/~asteroid/01509_09_p2nsp.png

The second period also explains the two decreases that we have suspected to be possible events in Brian's and Russ' data from 09-09 and 09-29; they are explained as being minima of the second period:
http://www.asu.cas.cz/~asteroid/01509_090909.png
http://www.asu.cas.cz/~asteroid/01509_090929.png

The 6.64-h period present there may be a rotation of the known (distant) satellite, though we cannot be really sure with the current knowledge. Anyway, we are going to announce the two periods on a CBET.

The campaign on this binary is over now. Great work all!

Cheers, Petr [2009-11-05 11:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at about 1:00UT but not sure if I will get more than 3 hours again tonight. But it has been raining here for weeks and I have to give it a go.

Russ [2009-10-28 01:59, Shed of Science] Message sent to observers

· Started at 01:30. Should be able to go for 3 or 4 hours before clouds move in.

Russ [2009-10-27 01:46, Shed of Science]

· Starting from ~17:40 UT. Stefan, Jozef [2009-10-25 17:32, Modra]

· Working from SRO tonight. -Walt [2009-10-24 02:47, Sonoita] Message sent to observers

· Working from SRO again tonight. -Walt [2009-10-14 02:54, Sonoita]

· Running from SRO again tonight. -Walt [2009-10-12 02:14, Sonoita]

· Running from SRO tonight. -Walt [2009-10-09 02:11, Sonoita] Message sent to observers

· An extensive dataset has been obtained from PDO, GMARS, S.Pleso, Shed of Science, and Ondrejov. Most of the data fit well with the single period, but there occured two attenuations: the one captured by Brian from PDO on 2009-09-09 (mentioned here before) and another one by Russ from Shed of Science on 2009-09-29, see following plots
http://www.asu.cas.cz/~asteroid/01509_09a_p1.png
http://www.asu.cas.cz/~asteroid/01509_09b_p1.png
http://www.asu.cas.cz/~asteroid/01509_090909.png
http://www.asu.cas.cz/~asteroid/01509_090929.png

Clear Skies, Petr [2009-10-01 13:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will be starting a run about 3:00 UT to 11:00 UT tonight.

Russ [2009-09-30 02:22, Shed of Science] Message sent to observers

· Will start a run on this beginning at about 8:00UT on 9/29 if weather permits. Run on 9/24 only resulted in a handful of useful frames due to clouds.

Russ [2009-09-29 04:07, Shed of Science]

· Observing from 20:03. Jozef, Stefan. [2009-09-27 22:34, Modra]

· After almost 4 months long upgrade of our telescope I'm starting regular observations with this target. Yesterday I observed it for 5 hours and observing from 18:30 UT tonight. Peter K. [2009-09-26 19:02, Ondrejov] Message sent to observers

· May get about 3 hours coverage on this tonight starting at about 8:00 UT, 9/24.

Russ [2009-09-24 04:24, Shed of Science]

· Super-LOTIS, our robotic telescope, is back online.
We will observe 1509 Esclangona from Sep 22 to Sept 30 (02:50 UT - 12:30 UT). This program may be interrupted due to exoplanet transit or GRB events, since we are sharing this telescope with other groups.
More soon hopefully
F. [2009-09-22 00:41, Marchis] Message sent to BinAstPhotSurvey conference

· Observing from 18:20 UT in good conditions. Michal [2009-09-21 18:20, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 18:35 UT in good conditions. Michal [2009-09-20 18:41, SkalnatePleso] [Remove]

· Starting this about 0215 UT (Sep 20). [2009-09-20 01:53, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Observing from 18:30 UT in good conditions at the moment. Michal [2009-09-19 18:35, SkalnatePleso] [Remove]
Message sent to observers

· Started this about 0215 UT (Sep 19). The dual coverage with GMARS will provide confirmation of any events or anomalies. [2009-09-19 02:21, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Brian has observed this one on three nights, captured what may be a mutual event on the 1st night:
http://www.asu.cas.cz/~asteroid/01509_09_p1.png
http://www.asu.cas.cz/~asteroid/01509_090909.png

The asteroid has a known distant satellite that was detected with AO in 2003 (Merline et al. 2003). Since mutual events between the primary and the distant satellite occur fairly infrequently, we have to consider also a possibility that the attenuation captured by Brian may be due to another, close satellite with a much shorter orbital period. There is a precedence case of 3749 Balam that has both a close (P_orb = 33.38 h) and a distant (P_orb one to two orders of magnitude longer) satellite (Marchis et al. 2008a, b). We don't know whether the case of Balam is exceptional or somewhat common, but we have to consider that Esclangona may be a similar case. I encourage a thorough collaboration on the target.

Clear Skies, Petr [2009-09-18 14:32, Ondrejov] Message sent to BinAstPhotSurvey conference

(48652) 1995 VB (Finished) [Add new note]
· Yura,

Great, thanks. Yes, your observations have resolved the ambiguity, the period is 13.7 h,
http://www.asu.cas.cz/~asteroid/048652.png
An uncertainty of the solution is about 0.1 h (as your quick-reduction data are relative, and our linked runs don't overlap in rotation phase), that may be refined with additional planned observations by David, Franck, and/or Joe (though already this result is U = 3 and good enough for the current phase of our work on paired asteroids).

Thanks for the help. I shall add you and A. Sergeev as co-authors of our prepared paper on primary rotations of asteroid pairs.

Cheers,
Petr

> Petr,
>
> The LC is attached.
> It's looked that it's fitted with 13.7hr LC.
> I'm waiting for your news.
>
> Yura
>
>
>> The observations were approximately done from 23.1 to 24.2UT.
>> In a hour I will send you "fast-reduced" LC.
>>
>> Yura
>>
>>
>>> Hello Yura,
>>>
>>> One hour from the different longitude may resolve it, I'll check it but
>>> please give me the interval in UT (I don't know a time zone of the times
>>> 22:30-23:30 you specified). Many thanks.
>>>
>>> Clear Skies, Petr [2009-11-16 02:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have asked observations of (48652) on 1.5 m telescope at Maidanak. The asteroid will be observed during one hour from 22:30 up to 23:30.Is it helped to solve the period's ambiguity?

Good luck,

Yura [2009-11-15 22:58, Kharkiv] Message sent to observers

· We have observed the primary of the asteroid pair 48652-139156 with the Danish 1.5m telescope from La Silla on four partial nights Nov. 12-15. It has turned out to have a longish period (in agreement with our theory, with its Delta H ~ 1.1), but we have got an ambiguity due to alias with 1 day: there are two possible periods 13.7 h and 19.2 h, see the data folded with the shorter period:
http://www.asu.cas.cz/~asteroid/048652.png
At the current asteroid's declination of +24 deg, solar elongation 136 deg (pre-opposition) and with the pointing limitations of the 1.5m telescope (cannot point below elevation 28 deg above the east), we can get sessions shorter than 3 hours only here from La Silla now. To resolve the ambiguity, observations (maybe just one night's run) from a different longitude or a session longer than ours is needed. I ask you to help with this one. Many thanks in advance. The data are to be used for our prepared paper on primary rotations of asteroid pairs.

Clear Skies, Petr [2009-11-15 19:35, Ondrejov] Message sent to BinAstPhotSurvey conference

(2480) Papanov (Finished) [Add new note]
· Don has done this one sufficiently for this 2nd apparition: period in agreement with the data from 2006, good coverage, no deviation seen.
http://www.asu.cas.cz/~asteroid/02480_a9.png
Target closed,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don.

Cheers, Petr [2009-11-04 14:24, Ondrejov] Message sent to observers

· Started at 0100 UT. Will try to run until 0800 UT. Joe [2009-11-04 01:20, Dark Sky & PROMPT]

· Started at 02:10 UT.
Don [2009-10-20 02:12, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 02:45 UT.
Don [2009-10-15 03:40, CarbuncleHill]

· Did a run on this on Oct 12, and plan on another run tonight starting at 02:40 UT.
Don [2009-10-14 01:51, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This one was done by Don from Carbuncle Hill on four nights: unique period, good coverage, a few deviating points seen but nothing that would trustworthilly indicate a binarity. It is finished for the Survey, note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don.

Cheers, Petr [2007-01-02 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this tonight, likely for the last time.
Don [2006-12-28 04:42, CarbuncleHill]

· Last night's run on this was no good due to light casting from a bright star. I'll be doing it again tonight under better conditions.
Don [2006-12-24 23:09, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I plan to do a second night on this, weather permitting. After one night, it looks like a fast rotator, somewhere around 3h.
Don [2006-12-22 01:02, CarbuncleHill]

(5774) Ratliff (Finished) - slow rotator [Add new note]
· Observations by Marek et al. from Skalnate Pleso and by Russ from Shed of Science have revealed that this one is a slow rotators,
http://www.asu.cas.cz/~asteroid/05774.png
The target is closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2009-10-26 12:02, Ondrejov] Message sent to observers

· Taking images of this one tonight.

Russ [2009-09-30 03:20, Shed of Science]

· Will be working this one again tonight. Will take some linking images as I will not be able to cover this one again until the 22nd.

Russ [2009-09-16 01:08, Shed of Science] Message sent to observers

· Doing periodic images of this one starting at 3UT.

Russ [2009-09-11 03:10, Shed of Science]

· Taking some frames of this one tonight. Fog may create problems before too long.

Russ [2009-09-10 04:16, Shed of Science] Message sent to BinAstPhotSurvey conference

· This one we observed in five nights from Aug 25 to Sep 1. But we catched only increasing/decreasing parts of LC, no extrema. I suppose covering LC's key parts from non-European countries. See http://www.ta3.sk/~mhusarik/5774/
Marek [2009-09-07 13:26, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(25068) 1998 QV88 (Finished) - slow rotator [Add new note]
· This slow rotator has been done well by Jozef, Leos and Adrian from Modra, by Don from Carbuncle Hill, and by Russ from Shed of Science,
http://www.asu.cas.cz/~asteroid/25068.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very good linked work, guys.

Cheers, Petr [2009-10-26 07:39, Ondrejov] Message sent to observers

· Several short sessions in 18-22.9. Linked data sent to Peter.
Jozef, Leos [2009-09-23 11:56, Modra]

· Took images and linking data on 9/16. Will send to Peter.

Russ [2009-09-23 03:34, Shed of Science] Message sent to observers

· Doing a few observations tonight starting at about 3UT.

Russ [2009-09-11 03:09, Shed of Science]

· Taking some frames of this one tonight but conditions are likely to turn to fog, so I will only get a few hours.

Russ [2009-09-10 04:17, Shed of Science] Message sent to observers

· Two short periods in the night 8/9. Sept. Jozef, Leos [2009-09-09 11:48, Modra]

· Two short periods in night 7/8. Sept. Jozef, Leos [2009-09-08 13:54, Modra] Message sent to observers

· Observed in two consecutive nights 5/6 and 6/7 Sept.
Leos [2009-09-07 13:02, Modra]

· Started a run at 02:55 UT.
Don [2009-08-27 03:59, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Will start this at 01:40 UT.
Don [2009-08-26 01:24, CarbuncleHill]

· I started this new target at 02:30 UT.
Don [2009-08-18 02:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

2009 KC3 (Finished) [Add new note]
· This radar-target was observed on 12 nights from Modra, SRO, Ondrejov and GMARS. These observations gave almost unique period of 11.768 h. Target is already too faint for our telescopes, so we can close it now.

http://www.asu.cas.cz/~asteroid/2009kc3.png

Peter K. [2009-10-22 08:51, Ondrejov] Message sent to observers

· Observing from 19:15 UT. Peter K. [2009-09-27 21:17, Ondrejov]

· Hello all, we have obtained several nights for this low amplitude object recently (21-25.9.), but seems like the rotation period is close to 12h or worse, 24h (if bimodal). This data would only be useful if combined with other's from a different longitude. In case someone has already done it or is planning to and wishes to combine, please let us know. Jozef. [2009-09-27 15:39, Modra] Message sent to BinAstPhotSurvey conference

(3034) Climenhaga (Finished) - probable binary (unobservable now; waiting for reduction of Prompt data) [Add new note]
· Observed 2009-10-20 in reasonable conditions, deviations detected. Data sent to Peter and Petr. [2009-10-20 21:19, HuntersHill] Message sent to observers

· Observed 2009-10-19 from 09:11UT to 14:33UT in reasonable conditions. Possible deviation noted int he lightcurve. [2009-10-19 22:30, HuntersHill]

· observed for 3 hours started from 10:35UT 10/18. [2009-10-18 20:57, Blue Mountains Obs] Message sent to observers

· Continued observation for this lunation is done for the past 2 nights and tonight. data obtained for 09/23 and 09/24 at from 12.5 and 10 UT respectively. Tonight started at 09:43UT 09/25. Averaging about 6 hours per session. [2009-09-25 13:40, Blue Mountains Obs] Message sent to observers

· I've done a series of observations on the following dates, 08/25,26,27,30,31 starting between 9UT to 10UT averaging 9 hours per session. P_2 is clearly seen but no mutual events noted. [2009-09-01 12:39, Blue Mountains Obs] Message sent to observers

· Got a run 8/25 from 0030-0935. With Julian's run from 0932 to 1832, this covers 18 of 18.95 hours. Joe [2009-08-26 00:27, Dark Sky & PROMPT]

· observed from 09:32UT 08/25 for 9 hours. Some high clouds but overall ok. [2009-08-25 23:18, Blue Mountains Obs] Message sent to observers

· Great dataset by Julian from Leura (21 nights during June 10-August 23) has given a unique solution for both periods apparent in the asteroid:
P_1 = 2.7376 h
P_2 = 18.954 h
http://www.asu.cas.cz/~asteroid/03034_p1.png
http://www.asu.cas.cz/~asteroid/03034_p2.png
It is a probable binary, but no obvious mutual events seen. To resolve the satellite, all we need now is some eclipses :-)

Ok, assuming that the observed P_2 is secondary's rotation and if the satellite is synchronous, there may develop events as asteroid's geometric conditions change. The asteroid moves by about 12 degrees in heliocentric coordinates in 30 days, so there is a chance that events may develop there before this apparition is over. A good coverage of the 18.95-h period with a few long overlaping sessions per lunation would be therefore good. Well, the current coverage in this lunation has not been entirely great yet, see
http://www.asu.cas.cz/~asteroid/03034_p2_090813_23.png
so Julian plans to take a few more long sessions to complete it (short or lower quality sessions wouldn't be useful, so don't bother in poorer conditions). A continued monitoring with the same strategy in next lunations would be good, until events are detected or the apparition is over, what comes first :-)

Clear Skies, Petr [2009-08-24 13:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have worked on this target on the 13,17,18,19,20,22 and 23 of august . the first 4 nights being secondary target i have only obtained 2 hours lenghts sessions. The last 3 with longer runs ranging from 5 to 8.5hours, showing no attenuation however the secondary period is quite apparent(kingsgrove observatory)Data sent in. [2009-08-24 02:34, Blue Mountains Obs] Message sent to observers

· Object is now ~14.0. Began 08/24 run on it at 0130 UT. Joe [2009-08-24 00:57, Dark Sky & PROMPT]

· Observed 0130-1030 UT on 08/05. Joe [2009-08-05 16:19, Dark Sky & PROMPT]

· Observed 0120-1030 UT on 08/04. Just began run tonight. Joe [2009-08-05 01:51, Dark Sky & PROMPT] Message sent to observers

· observed from 13.5UT on 04/08. Although the moon is nearly full, data is still useful. [2009-08-04 23:39, Blue Mountains Obs]

· observed from 10.5 and 10 UT on 08/01 and 08/02 respectively. [2009-08-04 02:33, Blue Mountains Obs] Message sent to observers

· Started run at 0130. Joe [2009-08-04 02:02, Dark Sky & PROMPT]

· Started Prompt run at 0050. Currently 0645. Sky Good Plan to run to 1030. Joe [2009-08-02 06:49, Dark Sky & PROMPT]

· observed from 10:44UT 07/31 for 8.5 hours from kingsgrove. [2009-07-31 21:50, Blue Mountains Obs] Message sent to observers

· observed 0n 07/29 and 07/30 short on 29th and on 30th started from 10.6UT to 18.8UT. Possible event on 15UT. [2009-07-30 23:32, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed 7/29-30 from 0400-1030 UT. Plan to observe again tonight 0100-1030 UT. Joe [2009-07-30 15:10, Dark Sky & PROMPT]

· observed on 07/27 and 07/28 started at 12UT and 11 UT respectively. [2009-07-29 10:44, Blue Mountains Obs] Message sent to observers

· Just started a planned 8 hour session. Joe [2009-07-16 02:39, Dark Sky & PROMPT]

· Just started a planned 7 hour run. Joe [2009-07-13 03:47, Dark Sky & PROMPT]

· Just started run of (hopefully) 8h. Did 6h run last night. Joe [2009-07-10 03:11, Dark Sky & PROMPT] Message sent to observers

· observed on 07/03 and 07/05 short sessions only i'm afraid, under pretty good condition though. [2009-07-06 02:25, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 13:44UT 06/24 under good observing condition. [2009-06-25 12:30, Blue Mountains Obs] Message sent to observers

· started observation at 13UT 06/23. [2009-06-24 10:12, Blue Mountains Obs]

· observed on 06/22 from 13.5UT for 4.5 hours under good condition. data sent in. [2009-06-24 02:31, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed on 2 nights 06/10 and 06/11 from 14UT in good condition. [2009-06-13 04:06, Blue Mountains Obs]

· Joe Pollock has observed this one with Prompt on five nights between May 1 and 24. His data show a 2-period lightcurve. There is an apparently unique period P_1 = 2.7376 h and a few possible solutions for the second period (one of them see below):
http://www.asu.cas.cz/~asteroid/03034_p1.png
http://www.asu.cas.cz/~asteroid/03034_p2.png
More observations are needed to nail down P_2 and to capture possible mutual events. Joe plans to take more observations with Prompt as weather allows (it was cloudy there the past two nights), but a help from station(s) on fairly different longitude(s) would be very useful. Since the asteroid is at declination of -21 deg, Australian stations are probably best suited for it.

Clear Skies, Petr [2009-05-26 07:55, Ondrejov] Message sent to BinAstPhotSurvey conference

(20421) 1998 TG3 (Finished) [Add new note]
· Main period appears to be ~12 h, but there are numerous deviations that we don't understand. Closed for the Survey. Petr [2009-10-01 07:35, Ondrejov]

· Started at 01:25 UT. Last night's attempt failed due to a pointing problem.
Don [2009-08-26 01:21, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started a run at 1:05 UT.
Don [2009-08-25 01:05, CarbuncleHill]

· Tonight, obtained some sparse data between 19:30 and 22:50 UT. Jozef, Stefan [2009-08-16 23:05, Modra]

· Started a run at 01:00 UT.
Don [2009-08-16 01:06, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this one to help out with coverage, planning to observe 19:23-00:00 UT. Jozef, Stefan [2009-08-15 20:26, Modra] Message sent to observers

· I started a run on this at 01:10 UT.
Don [2009-08-15 01:13, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Brian Warner has taken 4 linked nights, they show what appears to be same maximum on each of the nights. Combining also with two nights by Don, its period seems to be nearly commensurate with 1 day,
http://www.asu.cas.cz/~asteroid/20421.png

Brian and Don might not be able to nail it down themselves. One full night from a station on another continent would help them.

Clear Skies, Petr [2009-08-11 10:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Looks like it will clear. I'll see if I can fight the moon and win. [2009-08-05 02:43, PalmerDivide]

· Don's two short nights suggest a period of a few hours, but case unclear. Don has poor sky conditions these weeks to work this one well, he would appreciate another station to help out.
http://www.asu.cas.cz/~asteroid/20421.png

Clear Skies, Petr [2009-08-04 08:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 02:00 UT.
Don [2009-08-02 03:36, CarbuncleHill]

· We stopped observing of this one due to too dense star field.
Marek [2009-07-21 18:07, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 21:20 UT in average conditions only, with no further prediction. Michal [2009-07-19 21:23, SkalnatePleso] [Remove]

· Observing from 21:00 UT in good conditions. Michal [2009-07-17 21:07, SkalnatePleso] [Remove]
Message sent to observers

· This object observed this night. Gabo [2009-07-13 20:48, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(4524) Barklajdetolli (Finished) - slow rotator [Add new note]
· Great result for this slow rotator by Don and Russ. They are going to publish their result in MPB. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-09-09 14:10, Ondrejov] Message sent to observers

· Doing another short run with linking images.

Russ [2009-09-02 03:21, Shed of Science]

· Doing a run tonight with linking images from the last four nights.

Russ [2009-08-29 03:28, Shed of Science] Message sent to observers

· I did a very short run on this at about 03:30 UT.
Don [2009-08-27 03:56, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Getting additional images tonight started at about 4UT.

Russ [2009-08-26 04:19, Shed of Science] Message sent to observers

· Getting some images tonight on this one.

Russ [2009-08-18 05:20, Shed of Science]

· I took a few images of this one to continue the curve.
Don [2009-08-18 02:33, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I will be taking a few images tonight while working another object. Starting at 2:30 UT.

Russ [2009-08-17 02:37, Shed of Science] Message sent to observers

· I'll be taking a few images of this extremely slow rotator.
Don [2009-08-15 01:10, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Short run starting at 4:55UT after taking linking images.
Russ [2009-08-12 04:56, Shed of Science] Message sent to observers

· I will be starting this one at about 3:00UT and taking linking images for my previous nights at the same time.

Russ [2009-08-11 02:17, Shed of Science]

· The miserable conditions have abated for one night. I'll be starting this at 02:10 UT, and taking linking images.
Don [2009-08-02 01:18, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Should be able to start this one at 3:00UT.

Russ [2009-08-02 00:46, Shed of Science] Message sent to observers

· Started at 3:00UT. Taking periodic frames while doing 26471 run since this one appears to be a long period object.

Russ [2009-07-31 03:07, Shed of Science]

· Started this one at about 3:30UT under good conditions.
Russ [2009-07-26 03:48, Shed of Science] Message sent to observers

· Starting this near the end of the 5676 run.
Don [2009-07-11 02:09, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(79165) 1993 FR27 (Finished) [Add new note]
· Unsuccessful - very small amplitude (from four linked nights from Modra). Petr [2009-09-06 09:39, Ondrejov]

· Observing from 20:00 UT. We should obtain a third linked night for (9584). Jozef, Stefan. [2009-08-27 20:20, Modra]

· Planning this one to observe from 19:30 till ~2:00 UT. Also will try to take some data for the nearby (9584). Jozef, Leos. [2009-08-25 20:30, Modra]

(2965) Surikov (Finished) [Add new note]
· A probable solution by Julian from Leura,
http://www.asu.cas.cz/~ppravec/newres.htm
Closed for the Survey.

Petr [2009-08-19 06:44, Ondrejov] Message sent to observers

· observed on 08/17 and 08/18 to get multiple coverage of the complete light curve. Period 9.061h and amplitude of 0.3m. [2009-08-19 00:54, Blue Mountains Obs]

· Observation started on the 08/08,08/12 and 08/16 for 5 to 6 hours each. and 08/09 and 08/13 for short 2 hours. Data was just below limit of allowable precision due to smaller scope used. Period derived to be 9.053h and some back ground stars contamination may occur. [2009-08-17 10:59, Blue Mountains Obs] Message sent to observers

· I started this target with a short session on June 17. Clouds have kept things shut down ever since.
Don [2009-06-22 21:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(5986) Xenophon (Finished) [Add new note]
· This target was observed from Modra on 9 nights (two of them are too noisy and were not used). It's period is unique, coverage sufficient and no deviations were detected. Target is finished.

http://www.asu.cas.cz/~asteroid/05986.png

Peter K. [2009-07-28 12:29, Ondrejov] Message sent to observers

· I plan to finish this target tonight if the weather permits. Adrian [2009-07-21 22:02, Modra] Message sent to BinAstPhotSurvey conference

· Probably one more short session tonight. Adrian [2009-07-20 23:31, Modra]

· Actually, there are more sessions from Modra. The period may be around 6.9 h, amplitude of the lightcurve is about 0.5 mag. We hope it will be finished soon. Adrian [2009-07-20 05:15, Modra] Message sent to BinAstPhotSurvey conference

· Another run in 16/17 night. Leos [2009-07-19 06:32, Modra] Message sent to observers

· Two hours run on 13/14 July. The local minimum occured symmetrically. Leos [2009-07-14 09:08, Modra] Message sent to BinAstPhotSurvey conference

(6384) Kervin (Finished) [Add new note]
· Too dense star field, unsuccessful. [2009-07-02 10:32, Ondrejov]

· another night of observation starting at 8:30UT 06/24 . Tough region of the sky with numerous background stars. [2009-06-25 11:52, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· 2 nights data obtained for 06/22 and 06/23 starting from 12UT [2009-06-24 06:01, Blue Mountains Obs]

· A U=3- solution for its period. Apparent deviations in a few sessions remain unexplained (not repeating with any period), but in any case they don't indicate any possible mutual events. Additional data with errors <=0.01 mag only might be useful, that are not likely to be taken now. We are closing this one for the Survey; it remains a non-detection (no events seen).
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
http://www.asu.cas.cz/~ppravec/kervin.png

Cheers, Petr [2006-05-05 11:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Perhaps I could look at this tonight, although 73P comet so attracts these days. Adrian [2006-05-04 19:54, Modra]

· I'll be doing this tonight.
Brian, you still look clouded out. (?)

Don [2006-04-30 00:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be doing this tonight.

Don [2006-04-28 22:42, CarbuncleHill]

· I'll be doing this tonight.

Don [2006-04-28 00:09, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be doing this tonight.

Brian, if you're doing this one, I'll quit it shortly after you start.

Don [2006-04-26 23:53, CarbuncleHill]

· Working this tonight (Apr 26 UT). [2006-04-26 02:27, PalmerDivide] Message sent to BinAstPhotSurvey conference

· I've worked this since late March. It now appears to warrant some addition attention (see Petr's message below). Be forewarned that while getting a little brighter, the asteorid is fainter than predicted. I've been using exposures of 4-5m guided with the 20" and getting errors of 0.015-0.02m.
Please send me your data as well as to Petr. Thanks!
Petr's Message
A single period indeed doesn't fit. I'm getting a fit with 2-component model, where one period appears to be reasonably secure at 3.616 h, but the longer period needs to be nailed down. The preliminary solution see following pictures:
http://www.asu.cas.cz/~ppravec/kervin_shortpc.png
http://www.asu.cas.cz/~ppravec/kervin_longpc.png
It appears to be another possible/probable binary with two additive components, but no clear mutual events seen (i.e., not a full, regular detection). [2006-04-24 15:12, PalmerDivide]
Message sent to BinAstPhotSurvey conference

(3855) Pasasymphonia (Finished) [Add new note]
· Don has worked this one from Carbuncle Hill on five nights (3.3-4.7 h long): a double solution, both 6.5131 h and 7.542 h fit, a composite for the former:
http://www.asu.cas.cz/~asteroid/03855.png
In the next lunation the asteroid's conditions will not be favorable for northern hemisphere stations (and southern stations will be probably busy with other targets), so we close it for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2009-06-03 13:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:15 UT. Hopefully, this will finish it.
Don [2009-05-20 01:22, CarbuncleHill]

· I started a run at 01:00 UT.
Don [2009-05-16 02:22, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 01:10 UT.
Don [2009-05-14 02:03, CarbuncleHill]

· Started a run at 01:05 UT.
Don [2009-05-13 01:06, CarbuncleHill]

· Nice name. Started this new target at 02:10 UT.
Don [2009-04-30 04:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3748) Tatum (Finished) [Add new note]
· Another slow rotator, this time with a uniquely established period by Jim with 14 nights from Via Capote. Closed for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work on the slow rotator, Jim.

Cheers, Petr [2009-06-01 14:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed target from 04:45 to 11:30 UT. Moonlight increased sky background, reducing S/N. Period seems to be setteling in around 59 hours and .38 mag. In over 24 hours of target time, no deviations noted. Data sent [2009-04-07 13:07, Via Capote] Message sent to observers

· Observed target from 5:30 to 11:30 UT Target appears to have about a 56 hour rotation period. [2009-04-06 13:56, Via Capote]

· Observed from 5:12 to 11:30 UT under good conditions. Target appears to have a long period rotation. Possible maxima observed. [2009-04-05 13:13, Via Capote] Message sent to observers

· Observed this target from 05:05 to 11:35UT under good conditions. .18 mag continuous drop over session [2009-04-04 17:43, Via Capote]

· Plan to begin working this target at 05:00UT under good conditions [2009-04-04 03:58, Via Capote] Message sent to BinAstPhotSurvey conference

(2639) Planman (Finished) [Add new note]
· David has observed this one from Hunters Hill on five nights, revealed that it is a slow rotator. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-06-01 11:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009.05.03 from 10.27UT to 18:53UT in good conditions. Long period confirmed but no indication of a possible period. [2009-05-03 22:55, HuntersHill] Message sent to observers

· Observed 2009.05.01 from 10:30UT to 19:06UT in varing conditions (passing cloud). Target showed a steady increase in brightness of 0.3mag over the 9 hrs observation period indicating a likely period >36hrs [2009-05-01 23:07, HuntersHill] Message sent to BinAstPhotSurvey conference

(6405) Komiyama (Finished) [Add new note]
· Despite an extensive effort from a few stations (Hunters Hill, Carbuncle Hill, SRO, Shed of Science, Ondrejov), there remains an ambiguity in this one: both 9.929 and 19.855 h are possible. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/06405.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good efforts on the somewhat tough target, guys.

Petr [2009-06-01 10:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:30 UT.
Don [2009-05-31 02:03, CarbuncleHill]

· We're going to do this again tonight. Started around 4:15 UT under improving skies.

John G [2009-05-28 04:31, Sonoita] Message sent to observers

· We started this at 4:30 UT under fair but clearing skies.

John G [2009-05-27 04:36, Sonoita] Message sent to BinAstPhotSurvey conference

· I started a run at 01:30 UT.
Don [2009-05-21 02:26, CarbuncleHill]

· Observing this one from 21 UT. Best wishes, Kamil [2009-05-20 21:10, Ondrejov] Message sent to observers

· Did run on 5/19 from 3:45 to 7:45UT

Russ [2009-05-20 03:57, Shed of Science]

· I started a run at 01:15 UT.
Don [2009-05-20 01:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 01:30 UT.
Don [2009-05-16 02:25, CarbuncleHill]

· Last night's run was ruined by a bright star. Started tonight at 02:00 UT.
Don [2009-05-14 02:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting a run at 01:35 UT.
Don [2009-05-13 01:09, CarbuncleHill]

· Observed 2009.05.10 from 09:19UT to 17:10UT in moon effected conditions resulting in errors >0.03mag. However a period of 9.93 +/- 0.02hrs with an amplitude of 0.1 +/- 0.04mag is indicated. [2009-05-10 22:39, HuntersHill] Message sent to observers

· Two nights by David Higgins suggest a period nearly commensurate with 1 day. A few good long nights from a few stations on different continents are needed to establish it. I encourage you to collaborate on this one.

Clear Skies, Petr [2009-05-06 07:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009.05.03 from 10.02UT to 18:10UT in reasonable conditions. Possible period around 8.2hrs but the amplitude is so low that other periods around 12 and 24 hrs are equally possible. [2009-05-03 22:32, HuntersHill] Message sent to observers

· Observed 2009.05.01 from 09:57UT to 18:98UT in varying conditions. Data reveals a very low amplitude curve of around 0.1 +/- 0.01mag with a possible period around 8hrs but too early to tell. [2009-05-01 23:22, HuntersHill] Message sent to BinAstPhotSurvey conference

(8338) Ralhan (Finished) [Add new note]
· Done with five nights by David, Leos, and Kamil: unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/08338.png
Note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-05-07 08:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009.05.06 from 10:21UT to 18:43UT in reasonabel conditions. Some data poitns ignored due to bright field star. Data refined period to 5.273 +/- 0.002hrs with an amplitude of 0.4 +/- 0.02mag [2009-05-06 22:39, HuntersHill] Message sent to observers

· Also observed 2009 05 02/03 23:10 - 1:50 UT. Leos [2009-05-05 12:17, Modra]

· Observed for 3.5h up to 2:05 UT. Best wishes, Kamil [2009-05-05 02:11, Ondrejov] Message sent to observers

· Observed 2009.05.03 from 10.32UT TO 18.58UT in good conditions. Data reveals a period of 5.3 +/- 0.1hrs with an amplitude of 0.4 +/0 0.02 mag. [2009-05-03 22:53, HuntersHill]

· Last week, when we were out of internet connection, we started this asteroid. Quite an easy target, but we haven't finished it yet. Hopefully, we'll finish it soon. [2009-05-03 15:06, Modra] Message sent to BinAstPhotSurvey conference

(5752) 1992 CJ (Finished) [Add new note]
· David has established it to be a slow rotator with five nights from Hunters Hill. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2009-05-06 08:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009.04.17 from 10:18UT to 17:46UT in good conditions. Data reveals a relatively good monomodal fit at 42.8hrs with an amplitude of 0.8 +/- 0.03mag [2009-04-18 01:41, HuntersHill] Message sent to observers

· Observed 2009 04 12 in poor conditions. Extra data may indicate a minima. [2009-04-13 01:37, HuntersHill]

· Observed 2009 04 05 from 10:00UT to 18:47UT in reasonable conditions. Data revealed a continuous increase in brightness of 0.6 mag over the 9 hours of observation indicating a period in excess of 36hrs. [2009-04-05 22:32, HuntersHill] Message sent to BinAstPhotSurvey conference

(7116) Mentall (Finished) [Add new note]
· Five nights by Don and two nights by Kamil and Peter: nearly unique solution, good coverage, no significat deviation,
http://www.asu.cas.cz/~asteroid/07116.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the somewhat tough target.

Cheers, Petr [2009-05-04 09:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 21 UT and expecting ~3hr long run. Best wishes, Kamil [2009-05-03 21:21, Ondrejov] Message sent to observers

· Started a run at 02:30 UT.
Don [2009-04-28 03:54, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(6179) Brett (Finished) [Add new note]
· Six nights by Brian, Don, and Kamil: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/06179.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-05-04 09:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 03:00 UT.
Don [2009-04-30 04:13, CarbuncleHill]

· Started a run at 02:30 UT.
Don [2009-04-28 03:56, CarbuncleHill]

(12466) 1997 AS12 (Finished) [Add new note]
· Seven nights by Don and by Kamil and Peter: U=2+ solution, multiple coverage, no deviation,
http://www.asu.cas.cz/~asteroid/12466.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2009-04-27 12:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 23:05 UT. Best wishes, Kamil [2009-04-19 23:14, Ondrejov] Message sent to observers

· Starting this new target at 03:10 UT.
Don [2009-04-16 02:41, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4171) Carrasco (Finished) [Add new note]
· Six nights by David from Hunters Hill and Gabo, Michal and Marek from Skalnate Pleso have shown it to be a slow(ish) rotator (U=2),
http://www.asu.cas.cz/~asteroid/04171.png
We close it for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-04-23 11:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· This night my object is Carrasco. Gabo [2009-04-21 19:33, SkalnatePleso] [Remove]
Message sent to observers

· My target object this night is Carrasco from 20:00 UT. Gabo [2009-04-19 19:25, SkalnatePleso] [Remove]

· Observed 2009.04.17 from 10:22UT to 17:51UT in good conditions. A new period has been revealed at 16.84 +/- 0.04hrs with an amplitude of 0.15 +/- 0.03mag. The plot, however is not complete so further period derivations are possible. [2009-04-18 01:17, HuntersHill] Message sent to observers

· Observed 2009 04 16 from 09:10UT to 17:54UT in reasonable conditions. Data is noisy but reveals a possible period of 9.91 +/- 0.02 hrs with an amplitude of 0.1 +/- 0.03mag. [2009-04-16 23:32, HuntersHill]

· Observing from 19:40 UT in good conditions. Michal [2009-04-15 19:43, SkalnatePleso] [Remove]
Message sent to observers

· Observed 2009 04 12 from 09:30UT to 17:00UT in poor conditions (moon and cloud). Data barely within 0.03mag limit, low in amplitude (~0.1mag) and noisy, providing no indication of a possible period. [2009-04-13 01:41, HuntersHill] Message sent to BinAstPhotSurvey conference

(99475) 2002 CR118 (Finished) [Add new note]
· Three linked nights by Kamil and Peter from here, supported with one night by Don from Carbuncle have shown that it is a slow rotator. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2009-04-17 09:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Still trying to get a good run on this one. Started at 01:40 UT.
Don [2009-04-16 02:38, CarbuncleHill]

· I will be observing this one from 23:20 UT. Best wishes, Kamil [2009-04-15 21:36, Ondrejov] Message sent to observers

· Observing this one from 23:05 UT. Best wishes, Kamil [2009-04-14 23:12, Ondrejov]

· Started a run at 01:30 UT.
Don [2009-04-14 01:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing this one from 19:18 UT. Best wishes, Kamil [2009-04-13 23:38, Ondrejov] Message sent to observers

· Started this new target tonight.
Don [2009-04-13 03:37, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4285) Hulkower (Finished) [Add new note]
· Four nights by Marek and Michal from S. Pleso, by Leos from Modra, and by Kamil from here: unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/04285.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-04-14 14:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:50 UT in good conditions. Michal [2009-04-13 18:56, SkalnatePleso] [Remove]
Message sent to observers

· Started this one at 23:10 UT as the second target for tonight. Best wishes, Kamil [2009-04-12 23:20, Ondrejov]

· We observed this target on Fri 03.
LC has nice symmetric shape. Period ~6.20h, ampl 0.57mag.
Marek [2009-04-05 12:50, SkalnatePleso] [Remove]
Message sent to observers

· Observed 4.4.2009 22:02 - 03:08 UT. Leos [2009-04-05 11:14, Modra] Message sent to BinAstPhotSurvey conference

(7033) 1994 WN2 (Finished) - Returning 'prime suspect' - confirmation of attenuation needed [Add new note]
· Seven nights by Don from Carbuncle and one night by Kamil from here: a binary suspect, but inconclusive.
http://www.asu.cas.cz/~asteroid/07033_a9.png
Cf. with the data from 2006:
http://www.asu.cas.cz/~asteroid/07033.png
Closed for the Survey for this apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2009-04-07 12:00, Ondrejov]

· Started a run at 00:05 UT
Don [2009-04-01 01:24, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run on this at 00:15 UT.
Don [2009-03-25 01:40, CarbuncleHill]

· I'll be starting this one at 03:40 UT.
Don [2009-03-23 00:30, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Dear colleagues, I will try this one from ~18:30 UT. Best wishes, Kamil [2009-03-21 18:15, Ondrejov] Message sent to observers

· Don has observed this 'prime suspect' on five nights, detected one attenuation by 0.05 mag. More observations with errors not greater than 0.02 mag are needed to confirm it.

Clear Skies, Petr [2009-03-20 10:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on his at about 00:30 UT.
Don [2009-03-18 01:00, CarbuncleHill]

· Doing a run on this tonight.
Don [2009-03-05 04:17, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this returning \"prime suspect\" at 01:10 UT
Don [2009-03-04 01:13, CarbuncleHill]

· Despite an extensive effort during May 26 to June 4 by Don from Carbuncle Hill, by Julian from Leura, by Zbig from Elginfield, and by Adrian from Modra, no additional attenuations have been detected. The one attenuation of 2006-05-24.6 remains unconfirmed. The main period of 2.8158 +/-0.0001 h has rating U=2+, see a composite lightcurve on
http://www.asu.cas.cz/~asteroid/7033.png
The asteroid's observational window has closed for us, so we close the campaign now. A note on it has been added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-06-07 08:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 08:10 June 03 UT. Hope weather stay clear tonight. If so planning for 7 hours.

Julian [2006-06-03 09:27, Blue Mountains Obs]

· Started last night at 10:13UT, June 01UT. Interupted initially by a star and obtain 5.5 hours session after.
2.5 hours session previous night(May 31UT)

Julian [2006-06-02 00:40, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I try to observe this tonight, but I do not believe of any success.
Adrian [2006-05-31 20:56, Modra]

· Started this lastnight at 11:56, May29UT . Session lasted for about 3 hours until about 14:42 when it encountered a star about the same brightness and started to merge.
Seems like the weather is going to be bad for the next few days. So this is the lucky last..

Julian [2006-05-29 23:38, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started this at 01:45, May 29 UT.

Don [2006-05-29 02:04, CarbuncleHill]

· Patchy fog took too much out of this dim object, so my data is useless. Tonight should be better.

Don [2006-05-28 16:16, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Looks like the weather holds. Hope to get 7 hours tonight. started at 09:13, May28 UT

Julian [2006-05-28 11:02, Blue Mountains Obs]

· Started observation at 3:20, May 28 [UT] - Zbig [2006-05-28 03:36, Elginfield] Message sent to BinAstPhotSurvey conference

· Plan to start this at 1:30, May 28 UT.

Don [2006-05-27 23:45, CarbuncleHill]

· Just started observation at 09:25, May26UT

Julian [2006-05-26 10:19, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Data by Don from Carbuncle Hill (10 nights) and by Julian from Leura (2 nights), supported with one short night both by David from Hunters Hill and by Peter K. from here have shown a main period of 2.8158 h (U=2+), see
http://www.asu.cas.cz/~asteroid/7033.png
but there are apparent deviations on two nights. The first one is a brightening before the end of the 1st night (2006-05-05.2) by Don:
http://www.asu.cas.cz/~asteroid/7033_060505_carbunclehill.png
The second deviation has occured recently in the night of 2006-06-24.5 by Julian:
http://www.asu.cas.cz/~asteroid/7033_060524_leura.png
Julian sees no obvious observational problem there. (Despite there was a 6th mag star about 1/3 of fov away, it doesn't seem to affect the observations so significantly.) The brightness drop might be a mutual event, but we need to confirm it with more observations. A search for its possible period suggests that it would be probably longer than 1 day, perhaps even a couple days ....

Clear Skies, Petr [2006-05-26 08:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will start at 01:30, May 26 UT. Clouds approaching, but may hold off a while.

Don [2006-05-26 01:01, CarbuncleHill]

· Started at 08:56 May 25 UT
Julian [2006-05-25 11:16, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started at 01:30, May 25 UT.

Don [2006-05-25 01:31, CarbuncleHill]

· Started at 09:58, May 24UT [2006-05-24 11:14, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started at 01:25, May 24 UT.

Don [2006-05-24 01:38, CarbuncleHill]

· Started at 01:52, May 22 UT.

Don [2006-05-22 01:53, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 21 UT, May 21
Leos [2006-05-21 21:24, Modra]

· Started at 01:25, May 21 UT. Clouds skould stay away.

Don [2006-05-21 01:30, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Five nights by Don from Carbuncle Hill have shown the most likely period of 5.982 hours with a quadrumodal lightcurve, see
http://www.asu.cas.cz/~asteroid/7033.png
Different shapes of the individual extrema suggest that they are indeed four different maxima, but it would be good to nail it down with a couple long sessions with errors <0.03 mag. Particularly useful would be a collaboration of two stations at different longitudes on one night, that would cover the 5.982-h period more than once on a single night. Such good long data should also make us more certain on whether we have not been possibly confused by, e.g.. a 3-h period lightcurve with a sumperimposed second component ....

Cheers, Petr [2006-05-19 09:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 01:15, May18 UT.

Don [2006-05-18 01:25, CarbuncleHill]

· I'll give this a try if the weather holds.

Don [2006-05-16 23:07, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I plan to do a third run on this tonight.

Don [2006-05-06 23:09, CarbuncleHill]

· I'll be starting this one tonight. Partly cloudy conditions may prove troublesome.

Don [2006-05-04 23:40, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3825) Nurnberg (Finished) [Add new note]
· Two good R calibrated nights by Peter K. from here: Unique solution, double coverage, no deviation,
http://www.asu.cas.cz/~asteroid/03825.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Peter.

Cheers, Petr [2009-04-06 13:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:30 UT and expecting 6-hours long session finishing this target. Peter K. [2009-04-04 20:56, Ondrejov]

· I started this one at 21 UT. Peter K. [2009-04-03 22:01, Ondrejov] Message sent to BinAstPhotSurvey conference

(1676) Kariba (Finished) [Add new note]
· David took a third night, and found an observational problem (clock error) in the second night that caused the apparent deviations there, affected data were eliminated. Unique solution, good coverage, no real deviation,
http://www.asu.cas.cz/~asteroid/01676.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-03-31 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will begin observations at about 06:00 UT [2009-03-26 03:08, Via Capote] Message sent to observers

· Observed 2009-03-23 from 11:32UT to 19:14UT in good conditions. Period refined to 3.1682 +/- 0.0003h. No sign of any deviation in tonights data. [2009-03-23 20:44, HuntersHill]

· Hi David,

You commented on your data:
"Data is a little more noisey than I would have expected for such a low error, high amplitude target. It could be masking a deviation - but then again it might not....."

Your data from the second night indeed show a low-amplitude variation in residuals, see following plot (where they are folded with 3x the period):
http://www.asu.cas.cz/~asteroid/01676.png

Similar low-amplitude variations occur sometimes in data for most stations (for some very rarely or almost never, for others occassionally). They mostly turn out to be apparently something observational, as they are not confirmed by other data. In some cases, it is a real variation and a consistent solution is found with more data, usually when such variations have amplitude >0.04 mag. Your data show it just around the amplitude limit, so it is probably worth a check whether it is something real in the asteroid or an observational problem in your data. (We usually don't bother with such deviations if they have amplitudes <0.04 mag.) One good long session with errors <0.02 mag from some other station would be useful.

Clear Skies, Petr [2009-03-22 13:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2009-03-21 from 12:40UT to 19:15UT in good conditions. Period refined to 3.1644 +/- 0.0005h with an amplitude of 0.58 +/- 0.02 mag. Data is a little more noisey than I would have expected for such a low error, high amplitude target. It could be masking a deviation - but then again it might not..... [2009-03-21 20:24, HuntersHill] Message sent to observers

· Observed 2009.03.19 from 11:53UT to 19:12UT in good conditions. Data reveals a period of 3.17 +/- 0.01hrs with an amplitude of 0.58 +/- 0.02mag [2009-03-19 20:26, HuntersHill] Message sent to BinAstPhotSurvey conference

(7557) 1982 FK3 (Finished) [Add new note]
· Don has taken two good nights for this one: Unique solution, double coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/07557.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice, efficient work, Don.

Cheers, Petr [2009-03-27 12:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:55 UT.
Don [2009-03-26 03:42, CarbuncleHill]

· Started this new target at 00:50 UT.
Don [2009-03-25 01:34, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(5596) Morbidelli (Finished) [Add new note]
· Don has done this one: Unique period, useable coverage, no deviation,
http://www.asu.cas.cz/~asteroid/05596.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Sorry, Alan, nothing special in asteroid Morbidelli :-)

Cheers, Petr [2009-03-26 09:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at ~00:30 UT. Hope to finish it up.
Don [2009-03-25 01:38, CarbuncleHill]

· Doing a rn on this starting at ~03:40 UT.
Don [2009-03-23 00:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 00:50 UT
Don [2009-03-18 00:57, CarbuncleHill]

· Observed from 03:00 to 06:50, Mar 16 UT.

Don [2009-03-16 23:03, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3527) McCord (Finished) [Add new note]
· Don's linked data, supported with relative data by Jim Brinsfield, have revealed a period of about 321 h (U=2). We close it for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-03-25 08:38, Ondrejov] Message sent to observers

· Starting run at 03:15UT in good sky conditions with some gusty winds. Reduced sample frequencey [2009-03-23 03:07, Via Capote]

· started run at 03:15UT in good conditions. Reduced sample frequency [2009-03-20 04:34, Via Capote] Message sent to observers

· Started run at 03:30UT in good conditions Reduced sample frequency [2009-03-19 03:53, Via Capote]

· Starting run at 02:45UT in good conditions. Reduced sample frequency. [2009-03-18 02:37, Via Capote] Message sent to observers

· This will be run along with 11116 as a low sample density, long period target.
Don [2009-03-18 01:03, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started run at 0300 UT in good conditions. Monitoring long period rotator [2009-03-17 03:08, Via Capote] Message sent to observers

· Will start run at about 0300 UT in good conditions. As my data indicates thus far, this is a probable long period lightcurve, I am working a second target as well and reducing sample frequency on 3527 McCord to every 20 minutes. [2009-03-16 01:35, Via Capote] Message sent to observers

· Started run at 0300 UT under good conditions [2009-03-14 02:57, Via Capote]

· Low amplitude or long period - two linked nights could resolve it. Petr [2009-03-13 14:43, Ondrejov]

· Started run at 0301UT under good conditions [2009-03-13 03:05, Via Capote] Message sent to observers

· Observed 2009-02-28 from 10:45UT to 13:11UT before closed by cloud. Data revealed a faily flat lightcurve with a coupld of undulations. Amplitude of 0.06mag +/- 0.02mag [2009-03-05 21:13, HuntersHill]

· Started this at 02:00 UT.
Don [2009-03-05 04:33, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this at 01:45 UT.
Don [2009-03-04 03:08, CarbuncleHill]

(2380) Heilongjiang (Finished) [Add new note]
· Five nights by David from Hunters Hill, Adrian from Modra, Don from Carbuncle, and Michal and Marek from S. Pleso: Unique period (slowish rotator),
http://www.asu.cas.cz/~asteroid/02380.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-03-23 12:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:45 UT in good conditions. Michal [2009-03-21 19:45, SkalnatePleso] [Remove]
Message sent to observers

· I'll start a run at ~00:45 UT.
Don [2009-03-21 00:29, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Unfortunately, I am not successful due to local clouds :-( I am still waiting. Adrian [2009-03-20 19:59, Modra] Message sent to observers

· OK, I can try this tonight if the weather, telescope, camera, etc. permits. One never knows. Adrian [2009-03-20 18:20, Modra]

· David Higgins needs a help from some of you observing from other continents - one night might suffice.

Clear Skies, Petr [2009-03-20 12:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Given how close this target is to comensurability with 12/24hrs (11.16hrs) it would be good if we could get some observations from other longitudes. [2009-03-19 22:51, HuntersHill] Message sent to observers

· Observed 2009.03.18 from 09:54UT to 16:01UT when cloud rolled in. Period refined to 11.16 +/- 0.03 hrs with data covering the same 2/3rd of the curve as the previous night. [2009-03-18 21:26, HuntersHill]

· Observed 2009-03-17 from 10:23UT to 17:03UT in reasonable conditions. Data reveals a period of 10.5 +/- 1.5hrs with an amplitude of 0.2 +/- 0.02 mag. [2009-03-17 21:03, HuntersHill] Message sent to BinAstPhotSurvey conference

(6398) Timhunter (Finished) [Add new note]
· Four nights by Russ from Shed of Science and by Leos and Adrian from Modra revealed this one to be a slowish rotator,
http://www.asu.cas.cz/~asteroid/06398.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-03-23 10:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· The weather improved just a few hours before sunrise. We obtained a short session of ~2 h. Leos (and Adrian) [2009-03-21 11:26, Modra] Message sent to observers

· Unexpected clearing...starting at 4:30UT for about 6 hrs.

Russ [2009-03-21 04:33, Shed of Science] Message sent to BinAstPhotSurvey conference

· Began run around 2UT on 3/19 and ran for six hours or so. Good bright target for northern observers.

Russ [2009-03-19 16:13, Shed of Science]

(1446) Sillanpaa (Finished) [Add new note]
· An easy one, for a change. Five nights by Don, David, and Franck and his colleagues/students: Unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/01446.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-03-20 10:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· we started observing it at Lick-1m on March 18 at 04:50 UT. We are planning to continue until 12:15 UT [2009-03-18 05:24, Marchis]

· I'll be starting this around 02:15 UT.
Don [2009-03-18 00:59, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed 2009-03-17 from 10:49UT to 18:19UT in reasonable conditions. Period refined to 9.67 +/- 0.02hrs with an amplitude of 0.5 +/- 0.02mag. No deviations noted [2009-03-17 20:43, HuntersHill] Message sent to observers

· Observed 2009.03.16 from 10:57UT to 18:25UT in reasonable conditions. Data reveals a period of 9.8 +/- 0.6hrs with an amplitude of 0.5 +/- 0.02mag. [2009-03-16 21:08, HuntersHill] Message sent to BinAstPhotSurvey conference

(3376) Armandhammer (Finished) [Add new note]
· This one has turned out to have a low amplitude. Extensive observations by Russ from Shed of Science Observatory, by John, Walt, and Dirk from SRO, by Peter K. from here, by Michal and Marek from Skalnate Pleso, by David from Hunters Hill, and by Leos from Modra gave a U=2 solution:
http://www.asu.cas.cz/~asteroid/03376.png
We close it for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the tough target.

Cheers, Petr [2009-03-13 14:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing in good conditions from 23:00 UT. Michal [2009-03-01 23:13, SkalnatePleso] [Remove]
Message sent to observers

· We have ran this four nights total, 2/17, 2/20, 2/21, 2/24. Data sent to Petr.

John G [2009-02-25 04:26, Sonoita]

· Observed from 18:10 to 21:30 UT, 21.2.2009 Leos K. [2009-02-22 09:51, Modra] Message sent to observers

· We started this tonight at3:00 UT.
John G [2009-02-17 03:53, Sonoita] Message sent to BinAstPhotSurvey conference

· Observed from 10:45UT to 16:52UT in poor conditions. Data reveals a possible period of around 3.9hrs but the data is quite noisy. [2009-01-31 20:50, HuntersHill] Message sent to observers

· Observed from 11:05 to 17:17 UT in poor conditions (very hot weather with a large temp gradient overnight throwing focus off in the second half of the session). [2009-01-31 01:39, HuntersHill]

· Observing from 22:15 UT. Peter K. [2009-01-28 23:14, Ondrejov] Message sent to observers

· Started run at 4:15UT on 1/26. [2009-01-28 04:26, Shed of Science]

· Observed from 23:50 UT (after 76818). Peter K. [2009-01-25 23:58, Ondrejov]

· Started run on 3376 Armandhammer at 8:30 on 1/24 and should be able to continue until about 11:30.

Russ [2009-01-24 08:38, Shed of Science] Message sent to BinAstPhotSurvey conference

(21609) Williamcaleb (Finished) [Add new note]
· Don has obtained six linked nights for this one: slow rotator, U=2. We close it for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don.

Petr [2009-03-04 11:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:15 UT.
Don [2009-02-17 05:37, CarbuncleHill]

· Started a run at 01:00 UT.
Don [2009-02-16 01:17, CarbuncleHill]

· Will start a run on this at 02:10, Jan 30 UT. Intial run looked like it might be a slow rotator.
Don [2009-01-29 23:00, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(19483) 1998 HA116 (Finished) [Add new note]
· This one has been done by Don from Carbuncle and by Julian from Leura: Unique solution, some marginal deviations seen, but not above the detection limit of the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/19483.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don and Julian.

Cheers, Petr [2009-02-25 10:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:30 UT.
Don [2009-02-18 03:51, CarbuncleHill]

· Started a run at 01:40 UT.
Don [2009-02-17 05:36, CarbuncleHill]

· Started a run on this at 01:15 UT.
Don [2009-02-16 01:18, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 01:30 UT. Moon doesn't seem to be a problem.
Don [2009-02-05 03:52, CarbuncleHill]

· observed from 10:20UT to 13:00UT 2009-02-02. Event in the first 0.5h? Data sent in. [2009-02-03 03:40, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I started a run on this at 02:00 UT.
Don [2009-02-02 03:40, CarbuncleHill]

· New target observed from 10:37UT to 13:06UT 2009-01-30. Preliminary period 2.15h with 0.1m amplitude. [2009-01-31 06:28, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(4606) Saheki (Finished) [Add new note]
· David has taken two nights for this one: Unique period, good coverage, no deviation,
http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm
It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, good efficiency, David :-)

Cheers, Petr [2009-02-10 09:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 12:00UT to 18:18UT in poor conditions. Period refined to 4.696 +/- 0.003hrs with an amplitude of 0.56+/- 0.01mag. No deviations detected. [2009-01-31 20:51, HuntersHill] Message sent to observers

· Observed from 12:26UT to 18:00UT in poor conditions. Apparent large amplitude made the result more reliable for this one. Data indicates a period of 5.03 +/- 0.03hrs with an amplitude of 0.56 +/- 0.01mag. [2009-01-31 01:58, HuntersHill] Message sent to BinAstPhotSurvey conference

(84203) 2002 RD133 (Finished) - paired asteroid - collaboration needed [Add new note]
· Closing. [2009-02-09 13:59, Ondrejov]

· David Polishook has observed the paired asteroid with 0.46-m telescope from Israel on three nights during Jan. 19-26. His data are noisy (nightly rms residuals 0.06-0.09 mag), a bit below the requirement for the paired asteroids photometry project (errors <=0.05 mag). Moreover, he got only partial nights for it (sessions 3.5-4.8h long). Its period appears to be on an order of several hours, one possible solution:
http://www.asu.cas.cz/~asteroid/084203.png
A couple full-night sessions with a bigger telescope (>0.5 m) in good conditions are needed. We would appreciate your collaboration.

Clear Skies, Petr [2009-01-30 09:41, Ondrejov] Message sent to BinAstPhotSurvey conference

(35107) 1991 VH (Finished) - returning NEA binary (3-P case) [Add new note]
· Finally, the extensive dataset of 2008Dec-2009Jan obtained by Julian and supported with two nights by SRO revealed a presence of the P_1 component, despite with a lower amplitude in previous apparition (the period agrees well):
http://www.asu.cas.cz/~asteroid/91vh_09_p1.png
A second component is present, and though its solution is less certain, it can be fitted with a period not far from P_2 seen in 2003:
http://www.asu.cas.cz/~asteroid/91vh_09_p2.png
The orbital component:
http://www.asu.cas.cz/~asteroid/91vh_09_porb.png

The low P_1 amplitude of the past two months suggests that our aspect was closer to a pole of the primary than in previous apparition. As the orbit and spin vectors in the system don't appear aligned, an orbital precession may be present. Indeed, PetrS' modeling of the first two apparitions data suggested that the orbit precesses. These new data are a good dataset for further modeling of the system.

Nice observations, Julian et al., for the complex system.

Cheers, Petr [2009-02-09 13:27, Ondrejov] Message sent to observers

· observed from 09:58 UT to 14:54UT 2009-01-28 under good condition. However due to faintness and relatively fast apparent motion, data is <0.05m precision. This is it for me for this target. [2009-01-31 06:30, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 10:29 UT and finished at 17:17UT 2009-01-06 under good condition. [2009-01-07 21:27, Blue Mountains Obs]

· We started a run on this at 2:00 UT.

John G [2009-01-07 03:03, Sonoita] Message sent to observers

· observed from 10:15UT to 17:21UT 2009-01-05 . part of the event captured in the beginning. Data sent in [2009-01-06 06:35, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Another observation was done from 10:40 to 17:40UT 2009-01-01. Condition was good.Data sent in. [2009-01-04 12:35, Blue Mountains Obs]

· observed from 10:53 to 16:15UT 2008-12-30 and 11:42 to 17:27UT 2008-12-31. Good condition and full event captured centered at 14UT. Tonight's weather is holding well, will attempt another run. [2009-01-01 10:37, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 10:41 to 16:56 UT 2008-12-26 and 10:47UT to 16.56 UT 2008-12-28. both nights under good condition. [2008-12-29 07:12, Blue Mountains Obs]

· We have this in the schedule and it should start around 5:30 UT.

John G [2008-12-28 02:10, Sonoita] Message sent to observers

· Merry Christmas every one, hope you have a wonderful holiday break. I have gathered a few short (3-5 hours)light curves from 15/12 to 22/12 due to unsettled weather. Data has been sent to Peter. [2008-12-25 20:37, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Merline et al. have resolved the satellite of 1991 VH with adaptive optics system on the Keck II telescope, see a copy of their report on IAUC below.

Cheers, Petr

S/2008 (35107) 1
W. J. Merline, Southwest Research Institute (SwRI); A. R.
Conrad, W. M. Keck Observatory (WMKO); J. D. Drummond, Starfire
Optical Range, AFRL; P. M. Tamblyn, Binary Astronomy, Dillon, CO,
and SwRI; C. Dumas and B. Carry, European Southern Observatory; R.
D. Campbell and R. W. Goodrich, WMKO; C. R. Chapman, SwRI; and W.
M. Owen, Jet Propulsion Laboratory, report the first-ever near-
infrared imaging of a close-approaching binary minor planet: on
Aug. 9 UT, over a span of about 1 hr, they obtained J-, H-, and
K_p-band images -- using the 10-m Keck II Telescope (+ NIRC2/AO
adaptive-optics system) on Mauna Kea -- of clearly-separated
components of (35107) 1991 VH, which was first suspected as a
binary by Pravec et al. (IAUC 6607). On Aug. 9.236 the satellite,
designated S/2008 (35107) 1, was 0".08 (projected separation 3.1
km) in p.a. 105 deg from the primary (the smallest angular and
physical separations yet for a binary minor planet using adaptive
optics). The brightness difference was Delta(K_p) approximately
2.0 mag. The observed separation and size ratio are consistent
with the parameters derived by Pravec et al. (2006, Icarus 181, 63).

(C) Copyright 2008 CBAT
2008 September 19 (8977) Daniel W. E. Green [2008-09-19 07:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two more nights by Gary Vander Haagen of July 16.2 and 28.2 and one night by Peter K. from here of July 27.9 added: The 0.24-phase event covered again, but solution for P_2 is still not established.
http://www.asu.cas.cz/~asteroid/1991vh_08_p1.png
http://www.asu.cas.cz/~asteroid/1991vh_08_porb.png
http://www.asu.cas.cz/~asteroid/1991vh_08_p1_b.png
http://www.asu.cas.cz/~asteroid/1991vh_08_porb_b.png

Clear Skies, Petr [2008-07-29 07:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:40 UT and expecting about 3-hours long session tonight. Peter K. [2008-07-27 20:43, Ondrejov] Message sent to observers

· Four nights by Gary Vander Haagen (not a member of this consortium) taken between 2008 July 2 and 15 joined in. Current solution for P_1 and P_orb are in a reasonable agreement with estimates from the 1997 and 2003 apparitions, but a solution for P_2 is still pretty uncertain.
http://www.asu.cas.cz/~asteroid/1991vh_08_p1.png
http://www.asu.cas.cz/~asteroid/1991vh_08_porb.png

Further monitoring of events (ephemeris given in my message of July 14) with long sessions and absolutely calibrated data on all orbital phases (to hopefully resolve P_2 eventually) will be useful.

Clear Skies, Petr [2008-07-16 09:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data obtained:
2008-06-30.9, 07-03.0, 5.0, 6.0, and 8.0 by Peter and Kamil from here (linked data)
2008-07-01.9, 10.9, and 11.9 by Adrian et al. from Modra
2008-07-01.2 by John, Walt and Dirk from SRO
2008-07-03.2 by Don from Carbuncle Hill
A solution for P_2 is still not well established (as only a part of available data has been linked to a consistent magnitude system). Mutual events show an evolution, their further monitoring will be useful; ephemeris below.
http://www.asu.cas.cz/~asteroid/1991vh_08_p1.png
http://www.asu.cas.cz/~asteroid/1991vh_08_porb.png

Date/Time UTC (LTc.) Phase
--------------------------
2008- 7-15 16.50 0.240
2008- 7-17 1.30 0.240
2008- 7-18 10.10 0.240
2008- 7-19 18.90 0.240
2008- 7-21 3.70 0.240
2008- 7-22 12.50 0.240
2008- 7-23 21.30 0.240
2008- 7-25 6.10 0.240
2008- 7-26 14.90 0.240
2008- 7-27 23.70 0.240
2008- 7-29 8.50 0.240
2008- 7-30 17.30 0.240

Date/Time UTC (LTc.) Phase
--------------------------
2008- 7-15 0.43 0.750
2008- 7-16 9.23 0.750
2008- 7-17 18.03 0.750
2008- 7-19 2.83 0.750
2008- 7-20 11.63 0.750
2008- 7-21 20.43 0.750
2008- 7-23 5.23 0.750
2008- 7-24 14.03 0.750
2008- 7-25 22.83 0.750
2008- 7-27 7.63 0.750
2008- 7-28 16.43 0.750
2008- 7-30 1.23 0.750
2008- 7-31 10.03 0.750

Clear Skies, Petr [2008-07-14 14:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I know, I know I have just relative data, but, hopefully, they could partly help as well. Last night I probably caught an attenuation. Tonight seems to be fine weather, only Moon is brighter and temperature higher. Adrian [2008-07-11 20:23, Modra] Message sent to observers

· Some tiny clouds accompanied me (and this target) during the whole night. No one know if such observation could be useful. Adrian [2008-07-11 01:05, Modra]

· Observing from 20:50 UT and expecting full-night run. Peter K. [2008-07-07 21:40, Ondrejov] Message sent to observers

· Observed from 20:30 UT to 1 UT last night. Peter K. [2008-07-06 06:31, Ondrejov]

· Observed from 21:15 to 1:10 UT. Peter K. [2008-07-05 01:15, Ondrejov]

· We're planning to start this around 3:30 UT. We're between cloud systems so I am hoping they stay away tonight.

John G [2008-07-03 03:14, Sonoita] Message sent to observers

· I plan to start this at 02:00 UT.
Don [2008-07-03 00:14, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 20:40 UT and expecting full-night run. Peter K. [2008-07-02 21:42, Ondrejov] Message sent to observers

· Modra has problem with Internet connection but is planning to observe this one tonight (as nobody will observe here). Peter K. [2008-07-01 19:44, Ondrejov]

· Our run was cut short at 9:00 UT by clouds.
John G [2008-07-01 14:20, Sonoita] Message sent to observers

· Started a run on this at 3:50 UT. Expect to get a full night.

John G [2008-07-01 03:56, Sonoita]

· Dear colleagues, I will be observing this one from 20:20 UT. Expecting full-night run. Best wishes, Kamil [2008-06-30 17:35, Ondrejov] Message sent to observers

· New data joined in:
2008-06-26.0 by Richard Miles from Golden Hill
2008-06-26.2 by Don from Carbuncle Hill
2008-06-26.3 by Walt, John and Dirk from SRO
2008-06-28.0 and 29.0 by Albino from Saint Barthelemy
2008-06-28.3 by Mike Hicks and S. Somers from TMO
2008-06-28.9 and 29.9 by Kamil from here
All the new data have been useful, but a solution for P_2 is still not unique, basically because it appears to be commensurate with 1 day. (The fit for P_2 presented below is basically formal only, and a real shape of the P_2 lightcurve component may be pretty different.) Albino has covered a part of mutual event on June 28.0.
http://www.asu.cas.cz/~asteroid/1991vh_08_p1.png
http://www.asu.cas.cz/~asteroid/1991vh_08_p2.png
http://www.asu.cas.cz/~asteroid/1991vh_08_porb.png

To establish P_2, absolutely calibrated data only are going to be useful. Observations in the Cousins R band are preferred, though we should be able transform data taken in other bands to Cousins R using a spectrum obtained (Sk classication) or color indices if someone measures them accurately. The absolute calibrations should be accurate to <=0.02 mag. It appears that such absolutely calibrated data can be obtained by Kamil and Peter from here, by Mike and coll from TMO, by Yura and Nelya from Kharkiv/Simeiz, and by Richard from Golden Hill. I encourage them to take more observations for the asteroid through the rest of this lunation.

Monitoring of events (long sessions, doesn't matter if calibrated or relative) will be very useful for the NEA binary; they may develop relatively fast. The ephemeris below may not be very accurate, observations covering times also before or after the predicted times will be useful.

Date/Time UTC (LTc.) Phase
--------------------------
2008- 6-30 15.36 0.270
2008- 7- 2 0.06 0.270
2008- 7- 3 8.76 0.270
2008- 7- 4 17.46 0.270
2008- 7- 6 2.16 0.270
2008- 7- 7 10.86 0.270
2008- 7- 8 19.56 0.270
2008- 7-10 4.26 0.270
2008- 7-11 12.96 0.270
2008- 7-12 21.66 0.270
2008- 7-14 6.36 0.270

Date/Time UTC (LTc.) Phase
--------------------------
2008- 7- 1 8.20 0.785
2008- 7- 2 16.90 0.785
2008- 7- 4 1.60 0.785
2008- 7- 5 10.30 0.785
2008- 7- 6 19.00 0.785
2008- 7- 8 3.70 0.785
2008- 7- 9 12.40 0.785
2008- 7-10 21.10 0.785
2008- 7-12 5.80 0.785
2008- 7-13 14.50 0.785
2008- 7-14 23.20 0.785

Clear Skies, Petr [2008-06-30 09:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Dear colleagues, I will be observing this one from 20:20 UT. Expecting full-night run. The weather should be OK. Best wishes, Kamil [2008-06-29 15:13, Ondrejov] Message sent to observers

· Started a run on 21:30 UT for a full night coverage.

Albino [2008-06-28 22:03, OAVdA (B04)]

· Dear colleagues, I will try this one from 20:30 UT. Expecting full-night run, if weather permit. Best wishes, Kamil [2008-06-28 19:53, Ondrejov] Message sent to observers

· Observed from 21:19 UT to 24:38 UT 2008-06-27 under very clear and stable sky conditions. Probably mutual event captured. The 2008-06-26 session was disturbed by clouds.

Albino [2008-06-28 14:59, OAVdA (B04)] Message sent to BinAstPhotSurvey conference

· Started a run on 22:20 UT, very clear sky, good seeing condition. [2008-06-26 22:26, OAVdA (B04)]

· Two new sessions joined in:
2008 June 24.9 by Peter K. from here (cut short by an instrumental problem before the end of the night)
2008 June 25.2 by Don from Carbuncle Hill; event covered.

Solution for P_2 is improving, but still not unique. More data are needed. More observations by you, Don, John/Walt, Kamil/Peter, and Adrian, through the weekend should be useful to establish P_2 well.
http://www.asu.cas.cz/~asteroid/1991vh_08_p1.png
http://www.asu.cas.cz/~asteroid/1991vh_08_p2.png
http://www.asu.cas.cz/~asteroid/1991vh_08_porb.png

Clear Skies, Petr [2008-06-26 09:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· The clouds parted and we started this at 5:00 UT. We hope to run it until dawn, weather permitting.

John G [2008-06-26 05:14, Sonoita]

· Started this at 02:15 UT in hazy conditions.
Don [2008-06-26 03:24, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this one at about 02:20 UT.
Don [2008-06-25 03:15, CarbuncleHill] Message sent to observers

· Just started and expecting full-night run. Peter K. [2008-06-24 21:09, Ondrejov]

· Three nights by Mike Hicks, J. Somers, and H. Rhoades from Table Mopuntain Observatory joined in. A solution for P_2 is still not unique, one of several possible periods see below. Three clear events have been captured, two from TMO (June 14.3 and 20.3) and one from Modra (June 21.0); they are consistent with a period of 32.67 h found in 1997 and 2003.
http://www.asu.cas.cz/~asteroid/1991vh_08_p1.png
http://www.asu.cas.cz/~asteroid/1991vh_08_p2.png
http://www.asu.cas.cz/~asteroid/1991vh_08_porb.png
(Mike, last hour of the June 14.3 shows an increase that I cannot explain now. Could you please check whether there is all right with the data?)

More observations (long sessions) are needed. Data outside events are needed to establish P_2, and data covering events will be needed to estimate orbital parameters. We are giving the asteroid the highest priority here at the Czech and Slovak stations (Ondrejov, Modra, Skalnate Pleso) during these nights. It would be good if a couple or so stations in America could concentrate on it as well. Mike Hicks and his collaborators may not be able to observe it soon again, so I encourage a couple other US stations to help out. And, Yura and Nelya, if you could observe it from Kharkiv or Simeiz to extend the coverage east of us, it would be great as well.

Clear Skies, Petr [2008-06-23 15:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Jozef and Stefan took four nights from Modra from June 20.0 to 23.0. Their data show the period P_1 = 2.623 h seen in 1997 and 2003, and deviations that appear to be a combination of mutual events (P_orb = 32.6 h) and the third period (detected in 2003), though a unique solution for the additional period has not been obtained from the first data of this apparition yet. More observations (long sessions) are needed. I encourage others to help out.
http://www.asu.cas.cz/~asteroid/1991vh_08_porb.png
http://www.asu.cas.cz/~asteroid/1991vh_08_p1.png

Clear Skies, Petr [2008-06-23 10:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target for 3 nights: June 19,20 and 21, linked data sent to Peter. Jozef, Stefan. [2008-06-23 01:56, Modra]

· Observing in good conditions from 21:15 UT. Michal [2008-06-22 21:24, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(10134) 1993 HL6 (Finished) [Add new note]
· Don has done this one from Carbuncle on four nights: unique solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/10134.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2009-01-26 11:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 01:55 UT.
Don [2009-01-25 01:54, CarbuncleHill]

(34155) 2000 QJ22 (Finished) [Add new note]
· This one has been worked from SRO and Leura: U=2+ solution, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/34155.png
Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Julian and John.

Cheers, Petr [2008-12-15 09:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· We had dome problems last night but we have started this tonight at 2:28 UT and if the dome cooperates we should get a full run.

John G [2008-12-03 03:51, Sonoita] Message sent to observers

· This is our schedule to start near 2:24 UT.

John G [2008-12-02 01:36, Sonoita] Message sent to BinAstPhotSurvey conference

· Leura observatory is back in operation :) Started observing from 10:08UT and finished at 16:50UT 2008-11-30. [2008-12-01 22:44, Blue Mountains Obs]

· We started this around 2:40 UT and should get a full run on it.

John G [2008-11-30 03:37, Sonoita] Message sent to BinAstPhotSurvey conference

· We started a run on this at 03:10 UT.
John G [2008-11-24 03:41, Sonoita]

· Started on new target using my smaller scope. Data is borderline on 2nd night from poor seeing, but should be ok. Initial period 3.029h +/- 0.008h.
2008-10-25 10:29UT and finished at 17:34UT
2008-10-27 12:39UT and finished at 17:37UT
Kingsgrove [2008-10-28 01:50, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(1865) Cerberus (Finished) [Add new note]
· This YORP detection candidate was done from Ondrejov and Leura,
http://www.asu.cas.cz/~ppravec/newres.htm

Cheers, Petr [2008-11-12 13:47, Ondrejov]

· Observing from 16:50 UT while waiting for (1717) Arlon. Peter K. + Kamil H. [2008-11-03 17:22, Ondrejov] Message sent to observers

· Observing from 17:45 UT and expecting full-night run. Peter K. [2008-10-20 18:04, Ondrejov]

· This asteroid was observed to test our UC "new" robotic telescope Super-LOTIS (located at Kitt-Peak) on the following nights:
Sep 25-26 (03:40-10:30 UT)
Sep 26-27
Sep 27-28
Sep 28-29

The data will be processed hopefully soon.

regards
F. [2008-10-01 23:55, Marchis] Message sent to BinAstPhotSurvey conference

· Observed from 14:21 to 16:40UT 2008-09-30. This was done as a secondary target since its relatively low towards northern horizon effected by some local vegetation. Anyone, please feel free to jump in. [2008-10-01 10:31, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(4265) Kani (Finished) [Add new note]
· Three and half nights obtained by Richard from Golden Hill and by Brian from PDO: Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/04265.png
It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-11-03 14:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed 7.4 hr observing run last night. Three minima and two maxima covered. Preliminary analysis yields a rotation period = 5.75+/-0.04 hr. Unequal maxima of amplitude = 0.83+/-0.03 mag and 0.76+/-0.02 mag. [2008-10-25 22:59, Golden Hill Obs.] Message sent to BinAstPhotSurvey conference

· New target: More than 6 hr coverage completed under good conditions - continuing. [2008-10-25 02:55, Golden Hill Obs.]

(185851) 2000 DP107 (Finished) [Add new note]
· Last data by Brian from PDO (4 sessions, two events covered) and by Leos from Modra (1 short session) confirmed the recently somewhat decreased events depth. This apparition of the binary NEA is effectively over now, absolute calibrations of the data need to be completed, but more modeling may be started soon.
http://www.asu.cas.cz/~asteroid/2000dp107_081022_25_p1.png
http://www.asu.cas.cz/~asteroid/2000dp107_081022_25_porb.png

Cheers, Petr [2008-10-29 13:23, Ondrejov] Message sent to observers

· Started observing about 0130 UT (Oct. 28). Sent data from Oct 27 run earlier today to Petr and Peter. [2008-10-28 01:39, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Finished about 0930. Secondary event captured. Data sent to Petr and Peter. [2008-10-24 09:51, PalmerDivide]

· Started about 0115 UT (Oct 24). If skies hold, I should get the complete 0.755 phase event. [2008-10-24 01:31, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Additional data obtained for the return NEA binary since October 3 joined in:
3 nights by Brian from PDO,
3 nights by Stefan and Leos from Modra.
http://www.asu.cas.cz/~asteroid/2000dp107_080929_1019_p1.png
http://www.asu.cas.cz/~asteroid/2000dp107_080929_1019_porb.png
P_1, P_orb, as well as D_2/D_1 are in perfect agreement with data estimated from the 2000 observations. Most recent observations of the primary event by Leos from Modra on Oct. 19 suggest that its depth has decreased by a few 0.01 mag recently. The decreasing depth may mean that we are moving away from eclipse geometry. Data from such geometry will be particularly useful for future detailed modeling of the system. Monitoring of the events (with accuracy not worse than 0.03 mag) during next days would be good to confirm the trend. Ephemeris below.

Date/Time UTC (LTc.) Phase
--------------------------
2008-10-21 15.24 0.256
2008-10-23 9.41 0.256
2008-10-25 3.58 0.256
2008-10-26 21.75 0.256
2008-10-28 15.92 0.256
2008-10-30 10.09 0.256

Date/Time UTC (LTc.) Phase
--------------------------
2008-10-22 12.26 0.755
2008-10-24 6.43 0.755
2008-10-26 0.60 0.755
2008-10-27 18.77 0.755
2008-10-29 12.94 0.755
2008-10-31 7.11 0.755

Clear Skies, Petr [2008-10-21 15:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008 10 19/20 form 17:56 UT to 01:12 UT
Leos [2008-10-21 13:38, Modra] Message sent to observers

· Started observing about 0200 UT. Data from last night (2008 Oct 17) sent to Petr and Peter earlier today. [2008-10-18 01:57, PalmerDivide]

· Started observing about 0200 UT. [2008-10-17 03:05, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Observing it from 17:48 UT on Oct.12, 2008 (in R-filter due to strong moonlight). Just now, cirrus clouds began disturb my attempt for primary (0.250-phase) event catching.

Stefan [2008-10-12 19:27, Modra] Message sent to BinAstPhotSurvey conference

· Observing it from 18:13 UT on Oct.11, 2008. Awaiting full run covering secondary event.

Stefan [2008-10-11 18:31, Modra]

· Started about 0200 UT. Seeing not the best. [2008-10-08 02:57, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Started about 0515 UT (clouds late clearing). [2008-10-03 05:29, PalmerDivide]

· Data obtained for the return NEA binary:
7 nights by Brian from PDO,
2 nights by Peter K. from here,
2 nights by Richard Miles.
P_1, P_orb, as well as D_2/D_1 are in agreement with data estimated from the 2000 observations. The primary event has been covered 3 and half times, no more observations for it are currently needed. The secondary event has been covered less satisfactorily and one more full coverage would be useful; see ephemeris for the 0.75-event further below. The asteroid will be still observable after Oct14 full moon, and taking more data then would be useful for more detailed modeling.
Plots of the orbital lightcurve component:
http://www.asu.cas.cz/~asteroid/2000dp107_080929_1002.png
http://www.asu.cas.cz/~asteroid/2000dp107_080928.png
http://www.asu.cas.cz/~asteroid/2000dp107_080926.png
http://www.asu.cas.cz/~asteroid/2000dp107_080925.png
http://www.asu.cas.cz/~asteroid/2000dp107_080923_24.png

Clear Skies, Petr [2008-10-02 15:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing about 0300 UT. Data from 10/01 sent earlier today (10/1). [2008-10-02 03:37, PalmerDivide] Message sent to observers

· Will start observing around 0330 UT. [2008-09-30 01:17, PalmerDivide]

· Observing starting 0330 UT. [2008-09-29 05:53, PalmerDivide]

· Observing from 18:50 UT in very good condition but some high clouds may come later. Peter K. [2008-09-28 19:52, Ondrejov] Message sent to observers

· Good run on Sept. 28 (UT). Data from then and Sept. 26 forwarded to Petr and Peter. [2008-09-28 17:44, PalmerDivide]

· Observing starting around 0330 UT. Clouds may end the night prematurely. [2008-09-28 03:42, PalmerDivide] Message sent to observers

· Observing from 21:25 UT. Peter K. [2008-09-27 21:27, Ondrejov]

· I'll be starting this around 0430 UT (2008 Sept 26). [2008-09-26 02:45, PalmerDivide]

· Brian has observed the returning binary NEA on three nights Sept. 23-25, captured one complete and a part of another event:
http://www.asu.cas.cz/~asteroid/2000dp107_08_p1.png
http://www.asu.cas.cz/~asteroid/2000dp107_08_porb.png
More data are needed for both events to get more details on the system; ephemeris below. Data outside events are needed as well, both to see whether there don't develop "double events" (that would be spatially separated from the observed events in the current geometry) as well as to detect rotational variation from the secondary; in 2000, we have seen a substantial secondary's lightcurve, and it should be visible in this apparition as well, especially with linked data or long sessions when the asteroid slows down later in this lunation.

Date/Time UTC (LTc.) Phase
--------------------------
2008- 9-27 0.44 0.250
2008- 9-28 18.64 0.250
2008- 9-30 12.84 0.250
2008-10- 2 7.04 0.250
2008-10- 4 1.24 0.250
2008-10- 5 19.44 0.250
2008-10- 7 13.64 0.250
2008-10- 9 7.84 0.250
2008-10-11 2.04 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2008- 9-26 3.32 0.750
2008- 9-27 21.52 0.750
2008- 9-29 15.72 0.750
2008-10- 1 9.92 0.750
2008-10- 3 4.12 0.750
2008-10- 4 22.32 0.750
2008-10- 6 16.52 0.750
2008-10- 8 10.72 0.750
2008-10-10 4.92 0.750
2008-10-11 23.12 0.750

Clear Skies, Petr [2008-09-25 13:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this around 0430 UT (2008 Sept 25) [2008-09-25 07:20, PalmerDivide] Message sent to observers

· Started this about 0430 UT (2008 Sept 24). [2008-09-24 06:50, PalmerDivide]

· It looks like this will clear, so I\'ll give it a run. I think this is the first binary in which I was part of the \"discovery\", so it will be nice to visit this old friend. [2008-09-23 01:47, PalmerDivide] Message sent to BinAstPhotSurvey conference

(3576) Galina (Finished) [Add new note]
· Three nights by Julian and two nights by Peter have revealed a 0.05-mag lightcurve with a U=2 period solution. There is little hope that it should be resolved uniquely, during the rest of this apparition, so we are closing the target now.
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2008-10-29 12:54, Ondrejov] Message sent to observers

· Observing from 17:55 UT. Peter K. [2008-10-25 18:36, Ondrejov]

· observed from 09:36UT to 13:25UT 2008-10-08 . cut short due to pointing error. [2008-10-09 10:44, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Julian has observed this one on two nights: Amplitude of 0.04 mag only, but it looks promissing that we could nail down it with high quality data (full night sessions with errors of 0.01 mag or better). Julian is clouded out during these nights, so I encourage you to help out.
http://www.asu.cas.cz/~asteroid/03576.png

Clear Skies, Petr [2008-10-03 10:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 10:02UT and finished at 18:24UT under good condition. [2008-10-03 07:24, Blue Mountains Obs]

· started on target at 10:24UT and end at 15:23UT 2008-10-01 due to clouds.Period 3.25h . [2008-10-02 01:07, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(3007) Reaves (Finished) [Add new note]
· David has done this one on three nights of September 9 to 11: good coverage, no deviation detected. Finished for its 2nd apparition,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-10-24 08:41, Ondrejov]

· Observed 2008-09-11 from 12:53UT to 19:20UT in cloud affected conditions (a lot of data was lost). Period and amplitude unchanged. [2008-09-11 21:55, HuntersHill] Message sent to observers

· Observed 2008-09-10 from 12:37UT to 19:18UT in good conditions. Period refined to 4.157 +/- 0.002hrs with an amplitude of 0.5 +/- 0.02mag. No deviations detected but the plot shape seems quite interesting - Possible synchronous binary perhaps? [2008-09-10 21:49, HuntersHill] Message sent to observers

· Observed 2008-09-09 from 12:43UT to 19:25UT in good conditions. Data reveals a period of 4.14 +/- 0.03 hrs with an amplitude of 0.5 +/- 0.02mag. [2008-09-09 21:30, HuntersHill] Message sent to BinAstPhotSurvey conference

· This one has been worked by Oleg from Andrushivka and by Vishnu&Ron from Badlands: Unique solution, good coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/03007.png
A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-05-16 13:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this ~ 4UT. Excellent conditions. Should get additional 3+ hours to close this one.

Ron & Vishnu [2007-05-09 04:06, Vishnu Reddy/Tucson]

· Started run ~ 6 UT. Should get 3+ hours data.
Ron & Vishnu [2007-04-26 06:02, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Three nights by Oleg from Andrushivka gave a unique solution, good coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/03007.png
We wait with closing this one for additional data (Apr. 16) taken by Ron and Vishnu.

Cheers, Petr [2007-04-18 10:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run at 4:30 UT. Should get at least 5 hours of data if weather holds.
Ron and Vishnu [2007-04-16 04:49, Vishnu Reddy/Tucson]

· Starting this tonight ~19 UT. [2007-04-13 18:35, Andrushivka] Message sent to BinAstPhotSurvey conference

· Observed 12/13 Apr. Period ~4.1 with an amplitude ~0.37 mag. [2007-04-13 10:37, Andrushivka]

(24242) 1999 XY100 (Finished) [Add new note]
· Adrian et al. have obtained 12 linked nights from 2008 Aug. 25 to Sept. 3, supported with one night by David from Hunters Hill. It is a tumbler, see
http://www.asu.cas.cz/~asteroid/24242.png
The data are not suffitient for a full 2-period solution; PAR = -2. Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work on the slow rotator again, guys.

Cheers, Petr [2008-10-23 15:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-09-11 from 10:27UT to 17:17UT in cloud affected conditions. Data shows a possible peak then steady decline of 0.6 mag over the 7 hrs of observation indicating a period in excess of 28hrs. [2008-09-11 22:12, HuntersHill] Message sent to observers

· Observing it from 20:30 UT on Sep.1 at moderate conditions.

Stefan [2008-09-01 23:07, Modra]

· Started at 20:20 UT, expecting clouds. Jozef, Stefan [2008-08-31 20:55, Modra]

· Starting again at 20:50 UT, conditions are good. Jozef, Stefan. [2008-08-30 20:48, Modra]

· Started at 20:30 UT, variable conditions. Jozef, Stefan. [2008-08-28 20:30, Modra] Message sent to observers

· Started at 21:05 UT, good sky conditions
Leos [2008-08-25 01:16, Modra]

· In 4 hours a part of a curve has been captured, with one minimum and overall variation ~0.2 mag. Will try to work it today as well... and will see what the weather thinks. Jozef [2008-08-13 19:49, Modra]

· Planning to start this one tonight at ~21:30 UT. Jozef [2008-08-12 20:34, Modra] Message sent to BinAstPhotSurvey conference

(9000) Hal (Finished) [Add new note]
· Adrian and his collaborators have obtained linked data on 23 nights from 2008 July 29 to Aug. 24. The best period estimate, assuming a lightcurve symmetry with P/2, is 908 hours,
http://www.asu.cas.cz/~asteroid/09000.png
It is the 3rd or 4th slowest rotators known (competing with 2862 Vavilov where a period estimate is more uncretain), after 1997 AE12 with P ~ 1900 h and 288 Glauke with P ~ 1200 h.
It is close for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work on the extremely slow rotator, Adrian et al.

Cheers, Petr [2008-10-23 14:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Jozef has taken their fourth linked night on July 31.9, it showed a continuous decrease. So, it suggests a period longer than 10 days.
http://www.asu.cas.cz/~asteroid/09000.png

Clear Skies, Petr [2008-08-01 06:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:55 UT in good conditions. Michal [2008-07-31 20:59, SkalnatePleso] [Remove]
Message sent to observers

· Jozef and Leos have obtained two more nights for the asteroid and linked all their three nights to a common reference. Mean nightly levels of the first two nights differ by 0.09 mag, much more than an uncertainty of the linkage, so the asteroid has a long period,
http://www.asu.cas.cz/~asteroid/09000.png
The period cannot be definitely estimated from the available data, but it may be on an order of days. More observations would be useful only if linked to a common (even if instrumental) magnitude scale.

Clear Skies, Petr [2008-07-31 14:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don has taken four nights during July 7-16, revealed a low-amplitude lightcurve. He cannot observe it now since he is moving. Jozef and Leos have taken a high quality session from Modra on July 29.0, the low-amplitude variation is apparent there, but more high quality (full-night sessions with errors <0.01 mag) data are needed to establish it. The asteroid is already pretty bright and it is further brightenning, and it is favorably placed for observers from both hemispheres, so I encourage you to help out. Observations from more than one continent will be probably needed to establish it.
http://www.asu.cas.cz/~asteroid/09000.png

Clear Skies, Petr [2008-07-31 09:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from ~21.3 UT, expecting to finish ~<2.0 UT. Jozef, Leos [2008-07-28 21:34, Modra] Message sent to observers

· I plan to start this at 04:05 UT.
Don [2008-07-13 03:07, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I plan to start this at 04:15 UT.
Don [2008-07-11 02:50, CarbuncleHill]

· Attempting a run to start at 04:30 UT, weather permitting.
Don [2008-07-07 03:38, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting this at 04:45 UT.
Don [2008-07-03 00:15, CarbuncleHill]

· "Open the pod bay doors, Hal".
I couldn't resist this one. Will be starting at 05:15 UT.
Don [2008-06-26 03:26, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3928) Randa (Finished) [Add new note]
· Linked observations by the Modra group revealed it to be a slow rotator with a lower limit on period of 29.9 h. We close it for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the tough slow rotator.

Cheers, Petr [2008-10-22 07:45, Ondrejov] Message sent to observers

· After preliminary linkage of several nights, this one seems to be a slow rotator too. Continuing with monitoring. Jozef [2008-08-13 20:17, Modra]

· Observed August 9/10 and August 10/11. Juraj [2008-08-10 18:01, Modra] Message sent to observers

· Started at 22:30 UT, Juraj [2008-08-07 23:00, Modra]

· After two nights (short, 3-4 hours lasting runs in our latitude) in cirrus sky it seems that Randa is of long period or of very low amplitude (or both the cases?).
Linked sessions will reveal more.
Stefan, Juraj [2008-08-07 02:41, Modra] Message sent to BinAstPhotSurvey conference

· As other targets are of low declination, or are in crowded fields, we started this new target at 22:20 UT on Aug.04, 2008. But, comming cirrus clouds are worsening our sight...

Stefan, Juraj [2008-08-05 22:42, Modra] Message sent to BinAstPhotSurvey conference

(15268) 1990 WF3 (Finished) [Add new note]
· Our announcement on the new binary has appeared on CBET 1542 yesterday, copied below for your convenience and mentioned it on our web pages. The asteroid has faded by about 0.5 mag by now and probably we will not able to take more observations of sufficient quality with our usual instruments during the rest of this apparition, so I am closing the campaign now.

Cheers, Petr

(15268) 1990 WF3
J. Oey, Leura Observatory, N.S.W., Australia; P. Pravec, P. Kusnirak,
and K. Hornoch, Ondrejov Observatory; R. Stephens, Goat Mountain
Astronomical Research Station, Yucca Valley, CA, U.S.A.; S. Gajdos and L.
Kornos, Modra Observatory; and V. Chiorny, Institute of Astronomy, Kharkiv
National University, report that photometric observations obtained during
Sept. 24-Oct. 9 reveal that minor planet (15268) is a binary system with an
orbital period of 25.07 ± 0.02 hr. The primary shows a period of 2.4224
± 0.0001 hr, and it has a lightcurve amplitude of 0.07 mag, suggesting a
nearly spheroidal shape. Mutual eclipse/occultation events indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.27.

2008 October 20 (CBET 1542) Daniel W. E. Green [2008-10-21 14:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed 15:13UT to 18:20 UT 2008-10-09 capturing the whole 0.75 phase. [2008-10-10 00:12, Blue Mountains Obs]

· Another good run capturing phase 0.75. Started observing from 09:10UT and finished at 17:49UT 2008-10-07 [2008-10-08 04:29, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 11:24UT to 18:07 UT capturing phase 0.75 completely. Data sent in. [2008-10-06 23:44, Blue Mountains Obs]

· Three short sessions joined in:
2008-09-30.0 by Vasilij Chiorny from Kharkiv
2008-10-05.0 by Kamil from here, and by Leos from Modra.
Kamil and Leos have covered a part of the 0.25-phase event; P_orb has been refined to 25.04 +/- 0.02 h.
http://www.asu.cas.cz/~asteroid/15268_p1.png
http://www.asu.cas.cz/~asteroid/15268_porb.png
We need to cover the events again, especially the 0.75-phase event which has been covered only partially so far. Ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2008-10- 7 1.30 0.250
2008-10- 8 2.34 0.250
2008-10- 9 3.38 0.250
2008-10-10 4.42 0.250
2008-10-11 5.46 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2008-10- 6 12.89 0.755
2008-10- 7 13.93 0.755
2008-10- 8 14.97 0.755
2008-10- 9 16.01 0.755
2008-10-10 17.05 0.755

Clear Skies, Petr [2008-10-06 10:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data obtained so far:
4 nights by Julian from Leura,
2 nights by Bob from GMARS,
2 nights by Stefan from Modra,
1 night by Peter from here.
Both periods have been established:
P_1 = 2.4221 +/- 0.0006 h
P_orb = 25.1 h (error < 0.1 h)
http://www.asu.cas.cz/~asteroid/15268_p1.png
http://www.asu.cas.cz/~asteroid/15268_porb.png

Before we publish it on CBET, it would be good to cover the events again. The 0.75-phase event has been only partially covered so far, and the 0.25-phase events shows rapid changes that we don't understand yet. Ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2008- 9-30 19.31 0.250
2008-10- 1 20.41 0.250
2008-10- 2 21.51 0.250
2008-10- 3 22.61 0.250
2008-10- 4 23.71 0.250
2008-10- 6 0.81 0.250
2008-10- 7 1.91 0.250
2008-10- 8 3.01 0.250
2008-10- 9 4.11 0.250
2008-10-10 5.21 0.250
2008-10-11 6.31 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2008-10- 1 7.85 0.750
2008-10- 2 8.95 0.750
2008-10- 3 10.05 0.750
2008-10- 4 11.15 0.750
2008-10- 5 12.25 0.750
2008-10- 6 13.35 0.750
2008-10- 7 14.45 0.750
2008-10- 8 15.55 0.750
2008-10- 9 16.65 0.750
2008-10-10 17.75 0.750

Clear Skies, Petr [2008-09-30 10:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 10:15 to 18:39 UT 2008-09-28 in good condition. [2008-09-29 10:08, Blue Mountains Obs]

· I plan to observe the target this night, again (start ~20:15 UT).

Stefan [2008-09-28 17:03, Modra] Message sent to BinAstPhotSurvey conference

· Observed from 09.59UT to 17.47UT 2008-09-27 in good condition. [2008-09-27 22:05, Blue Mountains Obs]

· OK, I canceled my observation of 15268 as Stefan is observing it tonight. Peter K. [2008-09-27 21:23, Ondrejov] Message sent to observers

· Observing from 20:25 UT in variable conditions. Peter K. [2008-09-27 21:14, Ondrejov]

· Observing it from 20:26 UT; full run is ahead.

Stefan [2008-09-27 20:33, Modra] Message sent to BinAstPhotSurvey conference

· Looks like dome problem is fixed for the moment. Started observing at 10.30UT. [2008-09-27 11:31, Blue Mountains Obs] Message sent to observers

· Observing from 4:00 UT. Good conditions at GMARS.

Bob Stephens [2008-09-27 02:19, Santana]

· Observing from 22:10 UT but I'm not sure what weather will allow. Peter K. [2008-09-26 22:45, Ondrejov] Message sent to observers

· observed from 11:03UT to 15:37 UT 2008-09-24 and 10:17UT to 14:10UT 2008-09-25 under good condition. It looks like part an event were caught on the 25th night. Data sent in. [2008-09-26 22:41, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Julian's two nights (half nights only, due to his problem with the dome) show a decrease that may be an event. A good definition of the primary period and lightcurve shape is needed before we can be sure. I encourage others to help out - one or two full night sessions could nail it down.
http://www.asu.cas.cz/~asteroid/15268.png

Clear Skies, Petr [2008-09-26 08:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 11:03UT to 15:37 UT 2008-09-24 and 10:17UT to 14:10UT 2008-09-25 under good condition. It looks like part an event were caught on the 25th night. Data sent in. [2008-09-25 23:21, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started new target tonight 11UT. [2008-09-24 11:11, Blue Mountains Obs]

(7824) Lynch (Finished) [Add new note]
· Bob has taken 14 linked nights from GMARS: unique period of 75.2 h,
http://www.asu.cas.cz/~asteroid/07824.png
Closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work on the slow rotator, Bob.

Cheers, Petr [2008-10-21 13:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have been observing this one for the past week. Five nights of data suggest the period to be in the neighborhood of 150 hours. Observing again tonight from GMARS.

Bob Stephens [2008-09-27 05:06, Santana] Message sent to BinAstPhotSurvey conference

· Observed 2008-09-26 fromn 12:30UT to 18:40UT in wind effected conditions. Data indicated a general rise in magnitude of 0.08 over the 6 hours of observation indiacting a period in excess of 24 hours. [2008-09-27 02:13, HuntersHill] Message sent to BinAstPhotSurvey conference

(1763) Williams (Finished) [Add new note]
· Marek, Zuzana, Michal and Palo observed it from Skalnate Pleso on four nights, saw continuously increasing or decreasing brightness on each of the nights: it is a slow rotator with P > 36 h. We close it for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-10-21 13:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Here are four nights http://www.ta3.sk/~mhusarik/1763/
Marek [2008-10-21 07:34, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 17:00 UT in good conditions. Michal [2008-10-20 17:04, SkalnatePleso] [Remove]

· Only night Oct 18 was used from last four nights. Unfortunately, still the same trend without maxima/minima. My estimation is more than 50 hours.
Marek [2008-10-20 08:51, SkalnatePleso] [Remove]
Message sent to observers

· bserving from 19:00 UT in average conditions.Michal [2008-10-19 19:05, SkalnatePleso] [Remove]

· Observing from 17:00 UT in good conditions.Michal [2008-10-18 17:05, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 17:15 UT in average conditions at the moment. Stopped at 17:45 due to uncomfortable wind cond and seeing. Michal [2008-10-17 17:47, SkalnatePleso] [Remove]

· Observing from 18:30 UT in good conditions. Palo. [2008-10-11 19:41, SkalnatePleso] [Remove]
Message sent to observers

· Here http://www.ta3.sk/~mhusarik/1763/ is the second lightcurve with no evidence of any maxima/minima.
Marek [2008-09-29 11:26, SkalnatePleso] [Remove]

· Here's an image from the first night.
http://www.ta3.sk/~mhusarik/1763/ [2008-09-29 00:08, SkalnatePleso] [Remove]
Message sent to observers

· We started this one from 20 UT.
Marek and Zuzana Kr. [2008-09-28 20:21, SkalnatePleso] [Remove]

· After first night (only 4 h run) we have to say it is long-period object. In the lightcurve there is no sign of maxima/minima. So if this night will be good we will continue with this one. [2008-09-28 14:54, SkalnatePleso] [Remove]
Message sent to observers

· I wanted to observe Pogson tonight but there is a very bright star in the field. So now (1763) Williams was selected. I try it observe from 20:00 UT to 03:00 UT.
Marek [2008-09-27 20:03, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(4711) Kathy (Finished) [Add new note]
· David has got two nights from Hunters Hill: unique period, good coverage, no deviation seen. Done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-10-21 12:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-09-26 from 12:40UT to 19:02UT in wind effected conditions. Data refined period to 4.164 +/0 0.003 hrs with an amplitude of 0.52 +/- 0.02mag. No deviations noted. [2008-09-27 02:11, HuntersHill] Message sent to observers

· Observed 2008-09-25 from 12:25UT to 18:57UT in wind effected conditions. Data reveals a period of 4.18 +/- 0.02hrs with an amplitude of 0.5 +/- 0.02 mag [2008-09-25 22:14, HuntersHill] Message sent to BinAstPhotSurvey conference

(1472) Muonio (Finished) [Add new note]
· Observed for 6.7 hours last night in less than average conditions (moon-light and high cirrus). Fortunately, target was bright enough to get usable data. Now, after 3 nights from HuntersHill and one from here, this target is finished - unique period, no deviations and sufficient (at least double) coverage: http://www.asu.cas.cz/~asteroid/01472.png

Peter [2008-10-11 07:26, Ondrejov] Message sent to observers

· Observed 2008-10-09 in good conditions. Data refined period to 8.707 +/- 0.002hrs. No Deviations detected. Data sent to Peter. [2008-10-09 21:07, HuntersHill]

· Observed 2008-10-02 in windy conditions. Data refined the period to 8.67 +/- 0.01hrs with an amplitude of 0.32 +/- 0.02mag. No deviations noted. Data sent to Petr and Peter. [2008-10-02 22:46, HuntersHill] Message sent to observers

· Observed 2008-10-01 from 13:05UT to 18:15UT in reasonable conditions. Data reveals a period of 6.3 +/- 0.2hrs with an amplitude of 0.32 +/- 0.01mag [2008-10-01 22:20, HuntersHill] Message sent to BinAstPhotSurvey conference

(1800) Aguiler (Finished) [Add new note]
· David has observed it from Hunters Hill on two long nights: Unique period, good coverage, no significant deviation. It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-09-29 07:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-09-25 from 10:40UT to 18:31UT in wind effected conditions. Some deviation noted toward the end of the session but this is the wind effected part of the night. Period refined to 2.478 +/- 0.002hrs, amplitude of 0.11 +/- 0.02mag. [2008-09-25 21:59, HuntersHill] Message sent to observers

· Observed 2008 09 24 from 10:44UT to 18:49UT in reasonable conditions. Dense data reveals a period of 2.482 hrs with an amplitude of 0.11 +/- 0.01 mag. No obvious deviations noted. [2008-09-24 21:41, HuntersHill] Message sent to BinAstPhotSurvey conference

(5985) 1942 RJ (Finished) [Add new note]
· Julian's two nights of Sept. 19 and 20 have nailed down it and completed coverage,
http://www.asu.cas.cz/~asteroid/05985.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Vasilij, Julian, and Peter.

Cheers, Petr [2008-09-22 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 11:09UT to 17:39 UT 2008-09-19 in good condition. Period consistent with 9.6h. [2008-09-20 05:31, Blue Mountains Obs] Message sent to observers

· Vasilij Chiorny has observed the new target on two nights. A period solution of 9.6 h appears unique, but it is needed to nail it down and to complete its coverage. A couple long nights (not necessarily from one station) are needed. Vasilij cannot observe it again before September 21, so I encourage someone to help out.
http://www.asu.cas.cz/~asteroid/05985.png

Clear Skies, Petr [2008-09-10 14:35, Ondrejov] Message sent to BinAstPhotSurvey conference

(7030) Colombini (Finished) [Add new note]
· Four nights by Michal, Marek, and Palo from Skalnate Pleso, and one night by Kamil from here: Unique period, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/07030.png
It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-09-02 07:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will try this one tonight, if weather permit. Best wishes, Kamil [2008-09-01 20:25, Ondrejov] Message sent to observers

· Period 6.593 h and 0.48 mag amplitude. Can it be finished?
Marek [2008-08-31 16:46, SkalnatePleso] [Remove]

· Observing from 20:05 UT in good konditions. Palo [2008-08-30 20:40, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 21:50 UT in good conditions. Michal [2008-08-28 21:51, SkalnatePleso] [Remove]

· Data from two nights tells us that the period could be more than 6 hours and the amplitude about 0.5 mags.
Marek [2008-08-28 07:16, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 21:15 UT in good conditions now. Michal [2008-08-27 23:23, SkalnatePleso] [Remove]

· Observing from 20:20 UT in good conditions. Michal [2008-08-25 20:24, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(4182) MountLocke (Finished) - binary suspect by Behrend et al., later he called it off [Add new note]
· Observed 2008-08-27 and 2008-09-01 in reasonable conditions. Data reveals a period of 3.055 +/- 0.001hrs with an amplitude of 0.16 +/- 0.02mag but I cannot rule out periods of 3.017 or 3.093hrs. [2008-09-01 22:43, HuntersHill] Message sent to observers

· Raoul has called it off. [2008-09-01 12:14, Ondrejov]

· The three Julian's nights reveal a period of 3.018 h, it is a U=3- result, a nearby period is formally not much likely, but it is needed to nail it down with two consecutive nights (not necessarilly full nights), see
http://www.asu.cas.cz/~asteroid/04182.png
An attenuation seen during the last 1.3 h of the Aug. 13 session is correlated with increased photometric errors, so
we are not sure if it is real or artifact; see
http://www.asu.cas.cz/~asteroid/04182_080813.png
Julian doesn't have a favorable weather now, so we encourage someone from another station to help out.

Clear Skies, Petr [2008-08-26 13:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· 3 nights of observations showing a possible event on 2008-08-13 and no attenuations so far on both 08-23 and 08-25. Julian [2008-08-26 10:36, Blue Mountains Obs]

2008 BT18 (Finished) - radar NEA binary [Add new note]
· Current status of data reduction and analyzis:
P_1 solution unique, three attenuation detected by Julian, analyzis of P_orb awaits Prompt data from July, to be reduced by Franck et al.
http://www.asu.cas.cz/~asteroid/2008bt18_080718_26.png
http://www.asu.cas.cz/~asteroid/2008bt18_080729_0811.png

Petr [2008-09-01 13:44, Ondrejov]

· observed for 4 nights on 2008-08-04/08/09/11. No event detected. Julian [2008-08-12 21:40, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Data taken by Julian from Leura and Kingsgrove on 7 nights and by Gianluca with the 1.54m Danish Telescope in La Silla on 5 nights give a unique solution for P_1:
http://www.asu.cas.cz/~asteroid/2008bt18_p1.png
http://www.asu.cas.cz/~asteroid/2008bt18_p1_nsp.png

No more prominent atteuation similar to the one detected by Julian on July 26.6 captured. A few smaller deviations seen in the two Julian's most recent nights, but their nature needs to be understood with more data.

Clear Skies, Petr [2008-08-04 10:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 11:18UT to 19:52UT 2008-08-02 in excellent condition from Kingsgrove. Julian [2008-08-03 05:09, Blue Mountains Obs]

· observed from 10.28UT to 19:53UT 2008-08-01 in reasonable condition. data sent in. Julian [2008-08-01 23:12, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Julian has taken two more sessions for the binary. No event captured. An updated solution for P_1:
http://www.asu.cas.cz/~asteroid/2008bt18_p1.png

Clear Skies, Petr [2008-07-31 12:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Lance and his collaborators has announced the radar binary detection on CBET 1450. I'm copying it here for your convenience.

Cheers, Petr

2008 BT_18
L. A. M. Benner, Jet Propulsion Laboratory (JPL), California Institute
of Technology (CIT); M. C. Nolan and E. S. Howell, Arecibo Observatory,
National Astronomy and Ionosphere Center; C. Magri, University of Maine at
Farmington; J. D. Giorgini, S. J. Ostro, and M. Brozovic, JPL/CIT; M. W.
Busch, CIT; J. L. Margot and P. A. Taylor, Cornell University; M. K.
Shepard, Bloomsburg University; L. M. Carter, Smithsonian Institution; and
T. M. Becker, Lehigh University, report that Arecibo (2380-MHz, 12.6-cm)
and Goldstone (8560-MHz, 3.5-cm) radar observations during July 6, 7, and
11 reveal that minor planet 2008 BT_18 (cf. MPECs 2008-C03, 2008-H06; MPO
140193) is a binary system. Preliminary estimates for the component
diameters are about 0.6 km and > 200 m. The maximum distance between the
components on July 11 is at least 1.5 km.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2008 CBAT
2008 July 29 (CBET 1450) Daniel W. E. Green [2008-07-29 08:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Julian has observed the asteroid from Leura Observatory on three nights 2008 July 18, 21, and 26. (Data from July 26 and a critical part of data from July 21 have been internally linked.) A primary period of 2.57 h appears likely, but it is needed to nail it down with more data (two consecutive nights might do it). Gianluca's observations from ESO (he announced them to the group a few days ago) might already establish it.
http://www.asu.cas.cz/~asteroid/2008bt18_p1.png

Julian has captured a 0.2-mag deep event at 2008 July 26.6. More observations are needed to establish its period. In following plot, the data are folded with an arbitrary period:
http://www.asu.cas.cz/~asteroid/2008bt18_porb.png

Clear Skies, Petr [2008-07-28 09:14, Ondrejov] Message sent to BinAstPhotSurvey conference

(3018) Godiva (Finished) [Add new note]
· Three nights by Michal and Marek from Skalnate Pleso: Unique period of 10.88 h,
http://www.asu.cas.cz/~asteroid/03018.png
The slowish rotator has been done sufficiently for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-09-01 12:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:30 UT in windy conditions. Michal [2008-08-12 20:33, SkalnatePleso] [Remove]
Message sent to observers

· The first estimate is 10.8 h.
Marek [2008-08-12 08:33, SkalnatePleso] [Remove]

· Observing from 20:30 UT in windy, but later good conditions. Michal [2008-08-11 23:10, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 21:05 UT in good conditions. Michal [2008-08-10 21:22, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(1716) Peter (Finished) - non-BinAstPhotSurvey target [Add new note]
· Closing it here. [2008-09-01 12:18, Ondrejov]

· In the field with (3018) Godiva there was another asteroid (1716) Peter. We have observed it last two nights and try to do photometry. It seems that it is object with rot. period more than 10 hrs but with high amplitude approx. 0.8 mag.
Marek [2008-08-12 09:00, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(7043) Godart (Finished) [Add new note]
· Two nights by Vasilij Chiorny from Kharkiv, three nights by Kamil from here, and one night by Russ from Shed of Science observatory: Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/07043.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2008-09-01 11:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 20:40 UT. Best wishes, Kamil [2008-08-31 20:44, Ondrejov] Message sent to observers

· I will be observing this one from 20:45 UT. Best wishes, Kamil [2008-08-30 20:19, Ondrejov]

· Got a run going on Godart. Should get 5 hours or so.

Russ [2008-08-29 05:06, Shed of Science] Message sent to observers

· Kamil's data of 2008-08-28.0 joined in,
http://www.asu.cas.cz/~asteroid/07043.png
Two more sessions covering critical rotation phases could finish it.

Clear Skies, Petr [2008-08-28 08:13, Ondrejov]

· I will try this one tonight from 21UT. Weather should be OK. Best wishes, Kamil [2008-08-27 14:59, Ondrejov] Message sent to observers

· Vasilij Chiorny has observed the asteroid from Kharkiv on two nights. A solution for half period:
http://www.asu.cas.cz/~asteroid/07043.png
One more long session could nail the period solution down (and another one long night might be needed to complete double coverage). Vasilij cannot resume observations before September 4, so I encourage someone to take over and take a couple long sessions in the meantime.

Clear Skies, Petr [2008-08-26 13:50, Ondrejov] Message sent to BinAstPhotSurvey conference

(2527) Gregory (Finished) [Add new note]
· Vasilij Chiorny has taken four nigths from Kharkiv and Russ Durkee has taken one night from Shed of Science Observatory: Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/02527.png
A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2008-08-27 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started a run under good conditions. Should go for 5-6 hours.

Clear Skies
Russ [2008-08-26 03:56, Shed of Science] Message sent to observers

· Vasilij Chiorny has obtained two nights from Kharkiv. One of a few possible periods:
http://www.asu.cas.cz/~asteroid/02527.png
A couple more full nights might nail it down. We encourage observers from other stations to help out.

Clear Skies, Petr [2008-08-18 13:42, Ondrejov] Message sent to BinAstPhotSurvey conference

(8195) 1993 UC1 (Finished) [Add new note]
· This one has been done by Don from Carbuncle Hill (4 nights), by Kamil from here (3), and by Jozef and Stefan from Modra (1): Unique period, good coverage, no significant deviation. A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2008-08-07 06:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one from 19:40 UT with some cirrus in the sky. Best wishes, Kamil [2008-08-06 19:56, Ondrejov] Message sent to observers

· Started this one at 21:25 UT (working together with (1177) in the same field). Best wishes, Kamil [2008-08-04 21:29, Ondrejov]

· Started at 21:55 UT. Jozef, Stefan [2008-08-03 22:13, Modra]

· I started this one at 20:10 UT hoping in full-night run, if weather permit. May to take up it someone from US stations? Best wishes, Kamil [2008-07-30 20:17, Ondrejov] Message sent to observers

· Started this at 03:05 UT.
Don [2008-07-13 03:06, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll start with this at 3:10 UT.
Don [2008-07-11 02:49, CarbuncleHill]

· Started a run at 03:35 UT. Clouds may put an end to this.
Don [2008-07-07 03:37, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(929) Algunde (Finished) [Add new note]
· This "prime suspect" (i.e., a BinAstPhotSurvey target found in its first apparition to have P and A in the range where binaries are frequent) has been worked by Julian from Leura, by Jozef from Modra, and by Kamil from here on six nights with a total coverage of 26 hours in the second apparition now. A period and amplitude seen now is in agreement with data from the first apparition taken in March 2007 by Adrian et al., see
http://www.asu.cas.cz/~asteroid/00929_a8.png
http://www.asu.cas.cz/~asteroid/00929.png
No deviation from the single periodicity detected. The target is done for the 2nd apparition.

In the current apparition, the asteroid has been located 202 deg from its position in the first apparition - an aspect within 22 degrees from opposite. In the next apparition of the asteroid in December 2009/January 2010, it will be about about 121 degrees from its current position, so observations in the 3rd apparition will provide further useful constraints.

Great work, Julian, Jozef, and Kamil. A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-08-04 07:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 21:30 UT. Best wishes, Kamil [2008-08-03 21:30, Ondrejov] Message sent to observers

· Observed from 11.43UT to 19.45UT 2008-08-02 in good condition. Julian [2008-08-03 04:51, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I will be observing this one from 21:30 UT if weather permit. Best wishes, Kamil [2008-08-02 17:28, Ondrejov] Message sent to observers

· Started at 21.8 UT. Jozef [2008-08-01 22:08, Modra] Message sent to BinAstPhotSurvey conference

· Started target at 22.8 UT, unexpectedly. Weather is still uncertain. Jozef [2008-07-31 23:07, Modra]

· Started prime suspect target at 11:35ut and finished at 15:52ut 2008-07-31. Julian [2008-07-31 06:58, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This one has been done well by Adrian, Leos and Jozef from Modra: unique period, good coverage, no significant deviation. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2007-03-27 11:13, Ondrejov] Message sent to BinAstPhotSurvey conference

(153591) 2001 SN263 (Finished) - Ternary system (radar detection) [Add new note]
· Franck Marchis and his student have reduced observations of the ternary taken with Prompt and OHP during February-April 2008. Now I have joined in 10 nights taken with Prompt during March 16-April 4 when the asteroid was on the outbound branch of its trajectory and it was moving slowly in the sky and its geometric conditions changed slowly as well. Observations taken in such conditions are usually best ones for solving complex cases, since a slow apparent sky motion allows observers to take long sessions with same local reference stars (thus eliminating some error/uncertainty sources) and a slowly changing asteroid's geometry provides an opportunity to combine long series (many nights) of observations for a solution without a need to allow for changing lightcurve shapes (i.e., with a managable number of free parameters). In the case of 153591, the "sweet" interval occured during 2008 March 10-April 4, from which I have received more than 4500 data points: 13 nights taken by Julian Oey from Leura, 10 nights by Franck Marchis et al. with Prompt, and 7 nigths by David Higgins from Hunters Hill. The huge amount of good quality data has allowed me to search for a second rotational period in the data with more confidence than I could do before. A period about 14.367 hours has got out from them, see a noise spectrum:
http://www.asu.cas.cz/~asteroid/153591_p2_nsp.png
A lightcurve component for the period:
http://www.asu.cas.cz/~asteroid/153591_p2.png
It has up to four local maxima, but similarly complex secondary lightcurve shapes have been seen in a few others binaries, so it is nothing peculiar. Mike Nolan has obtained a preliminary estimate for the rotation period of the secondary of 15 +/- 3 h from their radar observations, so there is an agreement.

A primary lightcurve from the same interval:
http://www.asu.cas.cz/~asteroid/153591_p1.png
Btw, following plots show the primary lightcurve during previous observational intervals (a lightcurve evolution was seen):
http://www.asu.cas.cz/~asteroid/153591_p1_d.png
http://www.asu.cas.cz/~asteroid/153591_p1_c.png
http://www.asu.cas.cz/~asteroid/153591_p1_b.png
http://www.asu.cas.cz/~asteroid/153591_p1_a.png

Now when we have estimates for both P_1 and P_2, I can get mutual events much better from the data with subtracting the rotational lightcurves than before. When all data reductions are completed (there remains just some data taken from Lowell, do I recall it right, BrianS?), it will be especially useful to do further analyzes and modeling in coordination or collaboration with Mike Nolan et al.. We will keep you informed about progress.

Cheers, Petr [2008-07-31 08:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Analyzes to be completed after complete reductions are received. [2008-06-10 08:49, Ondrejov]

· Observed from 09:19UT to 17:58UT 2008-03-31. [2008-04-01 04:52, Blue Mountains Obs] Message sent to observers

· Observed 29, 30 and 31 March in good conditions. Deviation noted on the 29th, no deviations noted in the 31st data. Data sent to Petr and Peter. [2008-04-01 01:23, HuntersHill]

· observed from 09:33UT to 17:45UT 2008-03-30 in good condition. [2008-03-31 03:50, Blue Mountains Obs] Message sent to observers

· observed from 08:59UT to 17:51UT 2008-03-26 in good condition. [2008-03-27 11:34, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed 2008-03-16 in reasonable conditions. Data split over only 2 sessions this time. Data sent to Petr. [2008-03-17 04:31, HuntersHill] Message sent to observers

· observed from
09:13UT to 15:54UT 2008-03-08
09:11UT to 16:29UT 2008-03-10
09:37UT to 11:15UT 2008-03-11
11:46UT to 18:05UT 2008-03-13.
Julian [2008-03-14 05:07, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed 09:27UT to 13:19UT 2008-03-02 and again on 2008-03-03 for the same duration of time cut short by clouds. I will send in data once linking is done during next photometric night. Julian [2008-03-04 01:21, Blue Mountains Obs] Message sent to observers

· Started at 18:20 UT. The weather still holds, will try to continue till ~0 UT. Jozef [2008-02-27 21:31, Modra]

· Three more nights by Josef and Leos from Modra, and one more attenuation (depth 0.11 mag) detected:
http://www.asu.cas.cz/~asteroid/153591_080224_27.png
http://www.asu.cas.cz/~asteroid/153591_080224_27_a.png
http://www.asu.cas.cz/~asteroid/153591_080223.png
http://www.asu.cas.cz/~asteroid/153591_080223_a.png
http://www.asu.cas.cz/~asteroid/153591_080219_21.png
http://www.asu.cas.cz/~asteroid/153591_080219_21_a.png
http://www.asu.cas.cz/~asteroid/153591_080214_17.png
http://www.asu.cas.cz/~asteroid/153591_080214_17_a.png
A period of the events appears to be close to 140 h. Mike, is it consistent with your radar observations?

Cheers, Petr [2008-02-27 10:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started tonight at 18:10 UT. Jozef, Leos. [2008-02-26 18:30, Modra]

· Started 25.2. at 20:10 UT
Jozef, Leos [2008-02-25 21:43, Modra] Message sent to observers

· This object observed from 21:30 UT. Gabo [2008-02-25 21:01, SkalnatePleso] [Remove]

· Leos has captured a part of another event from Modra on 2008-02-23.8. A depth of the event is >=0.09 mag.
Two more nightly runs, 02-24.2 by Brian from PDO and 02-24.6 by David from Hunters Hill joined in as well, they didn't show any event deeper than a few 0.01 mag.
http://www.asu.cas.cz/~asteroid/153591_080223.png
http://www.asu.cas.cz/~asteroid/153591_080223_a.png
http://www.asu.cas.cz/~asteroid/153591_080219_21.png
http://www.asu.cas.cz/~asteroid/153591_080219_21_a.png
http://www.asu.cas.cz/~asteroid/153591_080214_17.png
http://www.asu.cas.cz/~asteroid/153591_080214_17_a.png

The three events (and other sessions showing no events) are consistent with a period around 140 hours. Or it may be something more complex, cannot tell yet. Mike, is a period near 140 h consistent for with your radar observations of the secondary orbiting the primary? Well, more lightcurve observations will be needed to establish a period of the events.

Cheers, Petr [2008-02-25 14:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 00:35 UT.
Don [2008-02-25 00:37, CarbuncleHill]

· Observed 2008-02-24 from 09:51UT to 16:07UT in reasonable conditions. Target now visible from the southern skies but still moving fast (had to split the observations into 5 sessions). [2008-02-24 22:36, HuntersHill] Message sent to observers

· My object today is 2001 SN 263. February,24. Gabo [2008-02-24 17:11, SkalnatePleso] [Remove]

· Observin session 23/24.2.2008 17:40 - 00:10 UT
I plan also tonight.
Leos [2008-02-24 17:06, Modra] Message sent to observers

· Adrian has observed the ternary from Modra on two nights Feb. 19.8 and 20.9. He captured an attenuation by ~0.10 mag on the last night. The available data don't allow us to get a unique solution yet. If the Adrian's event of Feb. 20.9 and the Albino's event of Feb. 15.1 belong to the same pair of bodies (primary plus one of the two satellites), then I get several possible values for their period, with a lower limit of 35 hours, and most likely values between 70 and 100 hours. If the attenuation captured by Adrian is a secondary event, then it gives a lower limit on the size ratio between the component and the primary of 0.3. More observations may bring more constraints, but a combination with radar observations may be necessary for unique interpretation.
http://www.asu.cas.cz/~asteroid/153591_080219_21.png
http://www.asu.cas.cz/~asteroid/153591_080219_21_a.png
http://www.asu.cas.cz/~asteroid/153591_080214_17.png
http://www.asu.cas.cz/~asteroid/153591_080214_17_a.png

Cheers, Petr [2008-02-21 15:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Looking at my new lightcurve there seems to be an attenuation involved at the second half of the session. Perhaps... Adrian [2008-02-21 00:51, Modra] Message sent to observers

· While clear night I can try to add some session. However, clouds are coming rapidly again. Adrian [2008-02-20 17:39, Modra]

· Not too long - it is cloudy from 22 UT and clouds grow around. They seem to acompany us till the morning. Adrian [2008-02-19 22:44, Modra] Message sent to observers

· I'll try a bit. Adrian [2008-02-19 18:02, Modra]

· Data by Jozef and Stefan from Modra (2 nights) and by Brian from PDO (1 night) joined in. A synodic period of 3.421 h is estimated from the data. (The difference of 0.003 h between the current value and the estimate from the Simeiz data of Jan. 15-Feb. 5 is consistent with a synodic-sidereal effect for the accelerating asteroid.) No more event captured so far.
http://www.asu.cas.cz/~asteroid/153591_080214_17.png
http://www.asu.cas.cz/~asteroid/153591_080214_17_a.png
There are apparent additional small deviations (amplitude on an order of a few 0.01 mag) that cannot be solved from the available data. High quality data with errors (over whole night) <0.01 mag would be needed to resolve them. It doesn't seem likely that such data could be obtained before the asteroid slows down later in this apparition.

Cheers, Petr [2008-02-18 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at ~17:20 UT, expecting full run. Jozef, Stefan. [2008-02-16 18:14, Modra]

· I'll be starting this as soon as it's dark enough. I'll be using the 0.5m and getting V/R images all night. [2008-02-16 00:27, PalmerDivide] Message sent to observers

· Interrupted by clouds at ~0 UT. Jozef,Stefan. [2008-02-16 00:24, Modra]

· Started this at 20:25 UT, 7369 was left in Peter's custody. Jozef, Stefan. [2008-02-15 20:39, Modra] Message sent to observers

· Albino has taken four sessions (covered interval length 7.1 h) on the last night. They show the 3.424-h lightcurve component with a superimposed downward trend for the last 2.5 hours, see
http://www.asu.cas.cz/~asteroid/153591_080214_15.png
I have also plotted the superimposed component (both Albino's nights) in a second plot (a period of 72 h used there in the plot is arbitrary):
http://www.asu.cas.cz/~asteroid/153591_080214_15_a.png
The decrease is by 0.11 mag. It looks like a (part of) decreasing branch of a mutual event with a relatively long orbital period.

Cheers, Petr [2008-02-15 17:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yura and Nelya have sent data from four nights 2008 Jan. 16.0, 17.9, 18.8, and Feb. 5.7. They reveal a period of 3.424 h. The Albino's data taken on Feb. 14.0 are in excellent agreement.

There are seen small deviations from the 3.424-h period. A possible, but not unique solution for an additional, second period gives 10.44 h with an amplitude of 0.03 mag. Though it is not unique (a couple nearby periods are possible as well) and it also relies on the assumption of bimodal lightcurve, it might be a rotation of the secondary. But it needs to be confirmed with more high-quality data. For now, take it as a tentative solution for the small deviations from the main period.

No obvious mutual event seen in the Simeiz+Albino's data.
http://www.asu.cas.cz/~asteroid/153591_08jan_all.png
http://www.asu.cas.cz/~asteroid/153591_08jan_p1.png
http://www.asu.cas.cz/~asteroid/153591_08jan_p2.png
http://www.asu.cas.cz/~asteroid/153591_080214.png

Cheers, Petr [2008-02-15 13:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:30 UT. It will set at 06:50.
Don [2008-02-15 00:31, CarbuncleHill]

· Started a new run at 19:35 UT. Hope to observe up to 02:00 UT.

Best, Albino [2008-02-14 19:37, OAVdA (B04)] Message sent to BinAstPhotSurvey conference

· Albino has taken data for the ternary system on the past night, three relative sessions, each of the 1.7-1.8 h long. They suggest a period around 3.53 h,
http://www.asu.cas.cz/~asteroid/153591.png
The solution needs to be nailed with a second (long) night.

Clear Skies,
Petr [2008-02-14 14:21, Ondrejov] Message sent to BinAstPhotSurvey conference

(5404) Uemura (Finished) [Add new note]
· The ambiguity 1.724 vs 3.448 h has not been resolved satisfactorily, more observations with a 1m telescope to resolve it are planned for August-October 2009.
Petr [2008-07-11 08:27, Ondrejov]

· Started observing at the NASA IRTF for near-IR data at 6:30 UT. Conditions are not the best so data might be marginal. Collecting as much data as possible to beat down the noise but extinction correction might be more challenging due to variable sky conditions.
Vishnu [2008-04-12 07:33, Vishnu Reddy/Tucson] Message sent to observers

· New data by Walt, John, and Dirk from SRO and by David from Hunters Hill have further refined the solution: 1.72444 +/- 0.00005 h,
http://www.asu.cas.cz/~asteroid/05404.png

For your interest, here is a plot with a fit for period twice as long:
http://www.asu.cas.cz/~asteroid/05404_2p.png

The 1.7244h period solution has been established reasonably, no more data are needed in this lunation. More observations with other telescopes (Vishnu with IRTF, Bowell et al. from Lowell in next lunation) are planned.

Cheers, Petr [2008-04-11 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-04-10 from 09:01UT to 17:32UT in reasonable conditions though a bright field star was present (and perhaps the reason for noise in the data). Data suggests a period of 1.727hrs and has been sent to Petr. [2008-04-10 23:04, HuntersHill] Message sent to observers

· The best new data obtained by John, Walt and Dirk from SRO: A solution from the three Modra nights and the long SRO night is 1.7246 h,
http://www.asu.cas.cz/~asteroid/05404.png
For your convenience, I plot also a fit for period twice as long
http://www.asu.cas.cz/~asteroid/05404_2p.png
It has significant signals in even harmonics only (up to the order 12), so the 1.7246h period appears to be a real one.

Additional shorter sessions by Kamil&Peter from here and by Albino from Saint Barthelemy are consistent with the solution as well.

Ok, I read here on the binast-webtool that John et al. plan to take another full night. It will be probably enough data for the asteroid. If someone liked to take more data, only full night data with errors of 0.01 mag are likely to be really useful; don't bother in poorer conditions.

Cheers, Petr [2008-04-10 12:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· We started this at 3:15 UT and should get another full night.

John G [2008-04-10 04:10, Sonoita] Message sent to observers

· Observed 2008-04-09 from 10:28UT to 13:04UT in reasonable conditions bounded by cloud. Data indicates multiple peaks inside a period of ~1.7hrs with an amplitude of 0.12 +/- 0.01mag. [2008-04-09 22:19, HuntersHill] Message sent to observers

· We'll be starting this around 3:15 UT and we should get a full night's data.

John G [2008-04-09 02:53, Sonoita] Message sent to BinAstPhotSurvey conference

· Started at 21 UT, good seeing. If the sky stay clear I make a BVRI photometry.

Albino [2008-04-07 21:44, OAVdA (B04)]

· Observing this one from 19:30 UT. Best wishes, Kamil [2008-04-07 20:02, Ondrejov] Message sent to observers

· Jozef, Stefan, and Adrian have observed this one from Modra on three nights. Their data fit with a period of 1.7244 h,
http://www.asu.cas.cz/~asteroid/05404.png
Possible longer periods would require six (or more) maxima/minima per period, which I consider unlikely, considering also that the data fit precisely with the 1.7244-h period. I rate their 1.7244-h period result with U=3-

The period 1.7244 h is shorter than any other period for asteroids with diameters >1 km. Though it is formally beyond the 2-h spin "barrier" that we see for asteroids larger than 1 km, it still may be a cohesionless body if its bulk density is near 5 g/ccm (e.g., a metallic asteroid). It would be useful to take one more full night (with errors <0.02 mag) both to further refine the period estimate as well as to get a more thorough coverage to look for possible binarity (though there is no sign for that in the Modra data). I encourage someone to help out; Modra may not be able to observe it soon.

Cheers, Petr [2008-04-07 13:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· A strange sky here - unexpectedly not so cloudy as predicted. The lightcurve for rapid rotator could probably be finished, but this one more run could help as well if no attenuation is present. Adrian [2008-04-04 00:05, Modra] Message sent to observers

· Started with it at 20:38 UT on Mar.31, 2008.

Stefan [2008-03-31 21:23, Modra] Message sent to BinAstPhotSurvey conference

· The data shows rapid variation that seems to fit a trimodal curve with amplitude 0.09 and period 1.71 h. Jozef, Stefan. [2008-03-31 03:19, Modra]

· Started at 20:30 UT. Jozef, Stefan. [2008-03-30 21:11, Modra] Message sent to BinAstPhotSurvey conference

(13189) 1997 AF13 (Finished) [Add new note]
· This target was observed on 6 nights (5 of them in current lunation) by Julian. His observations revealed a period of 5.937 h and amplitude of 1.1 mag. The period is unique, LC has sufficient coverage and no deviations were detected. The target is finished now.

Peter K. [2008-06-27 12:13, Ondrejov] Message sent to observers

· observed from 12:19UT to 16:30 UT 2008-08-25 and 9:18UT to 17:15UT 2008-06-26 where light curve affected by 2 relatively bright stars. Julian [2008-06-27 00:52, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 08:15UT to 16.36 UT 2008-06-23. Period refined to 5.9374h +/- 0.0003h. Amplitude increased to about 1.0m. [2008-06-24 02:18, Blue Mountains Obs]

· observed from 10:21 to 17:20 UT 2008-06-22 in good condition. [2008-06-23 13:07, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 12:49 to 18:50 UT 2008-05-30. Period established as 5.94h +/-0.04h. [2008-05-31 07:20, Blue Mountains Obs]

(279) Thule (Finished) [Add new note]
· We don't plan to get more data for the spurious case within this group. Petr [2008-06-19 12:37, Ondrejov]

· We'll likely get about 3.5 hours on this tonight. Started at 3:30 UT.
John G [2008-06-05 03:38, Sonoita] Message sent to BinAstPhotSurvey conference

· Seven long nights by David from Hunters Hill and three short sessions (2.2-2.5 h) by Don from Carbuncle Hill give a period of 15.95 h, but periods of 23.9 h and 7.97 h are possible as well. To resolve the ambiguity, observations from stations at different longitudes than the David's and Don's observatories are needed.
http://www.asu.cas.cz/~asteroid/thule.png

Clear Skies, Petr [2008-06-03 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 01:30, May 30 UT. Last night I measured a nearly flat part of the curve. Perhaps I'll see it again.
Don [2008-05-29 23:34, CarbuncleHill]

· Observed 2008-05-29 in good conditions. I believe I have captured the same minima again. Since all my sessions appear to be the same minima I do not believe I can contribute any more useful data to this target. 23.9hrs still appears to be the best fit for my data. [2008-05-29 22:25, HuntersHill] Message sent to observers

· I have 7 nights worth of data on this target already (including last night) with no indication of deviations. Period fits at 15.9 and 23.9hrs. [2008-05-29 01:53, HuntersHill]

· I should have added that I started a run at 01:30 and will finish at 04:00 UT.
Don [2008-05-29 01:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Well, since this isn't a survey target, maybe I shouldn't post here. I'm listing it here to coordinate with anyone in the group who may be interested in observing it.
Don [2008-05-29 01:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4340) Dence (Finished) [Add new note]
· Despite abundant data obtained by you from Modra and Cabruncle Hill, the ambiguity 7.56 vs 15.12 h cannot be formally resolved. The shorter period appears physically more likely, as for the longer period, the lightcurve has low signals in odd harmonics, but it remains U=2.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys, on the tough case.

Cheers, Petr [2008-06-19 12:35, Ondrejov] Message sent to observers

· Observing it from 20:51UT, planned full run again. Will try link two recent sessions.

Stefan [2008-06-10 21:43, Modra]

· Observing it from 21:00; full but short run will end at 23:30UT (June 9, 2008). Perhaps only linked sessions will help in this season heading to summer solstice.

Stefan [2008-06-09 21:57, Modra] Message sent to BinAstPhotSurvey conference

· The ambiguity 7.56 vs 15.12 h has not been resolved so far, a few more sessions longer than 3 hours with errors of 0.01 mag are needed. Petr [2008-06-02 14:26, Ondrejov]

· Observing it from 20:28 UT on May 13, 2008, awaiting full run.

Stefan [2008-05-13 21:47, Modra] Message sent to BinAstPhotSurvey conference

· Observed it from 20:30 to 01:42 UT on 12/13, May 2008.

Stefan [2008-05-13 12:18, Modra] Message sent to observers

· Observed from 21:52 UT, on Apr.28, 2008.

Stefan [2008-04-28 23:14, Modra] Message sent to BinAstPhotSurvey conference

· Started with this target at 22:15 UT on Apr. 27, 2008.

Stefan [2008-04-27 23:23, Modra]

· Will start this target on about 19:50 UT, Apr.26, 2008.

Stefan [2008-04-26 19:23, Modra] Message sent to BinAstPhotSurvey conference

· Unexpectedly clear, but very bright sky - not knowing for how long this session is "alive". Some tiny clouds make the high background, only brightest stars (and the Moon) are visible. But the telescope with a camera can see even faint stars. Adrian [2008-04-17 22:46, Modra] Message sent to observers

· Started a run at 02:00 UT.
Don [2008-04-17 02:03, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I startd a run on this at 01:50 UT.
Don [2008-04-15 02:08, CarbuncleHill]

· One session obtained by Don was joined in. It's in good agreement with 15-hours solution what should be unique after 1-2 more sessions (5+ hours).

http://www.asu.cas.cz/~asteroid/04340.png

Peter K. [2008-04-14 17:29, Ondrejov] Message sent to observers

· Data from Modra (3 nights, 17.7 hours total covarage) show period of 15.2 h and amplitude 0.08 mag. But more data are still needed to improve solution. Peter K. [2008-04-14 16:45, Ondrejov]

· Did a run on this starting about 3:50 UT.
Don [2008-04-14 15:41, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 19:50 UT. Jozef. [2008-04-13 19:47, Modra]

· Obtained two nights of this new bright target. In both nights the weather turned out much better than forecasted. It seems we caught one maximum and one minimum in at least one of the two ~6h long sessions, with variation not exceeding 0.1 mag.
Jozef, Stefan. [2008-04-13 15:19, Modra] Message sent to BinAstPhotSurvey conference

(137170) 1999 HF1 (Finished) - returning binary NEA [Add new note]
· The data taken from Ondrejov, Carbuncle Hill, SRO, and Skalnate Pleso during 2008 April 13 to May 1 have given parameters estimates that are entirely in agreement with estimates from previous apparition. We will start a more detailed modeling of data from this and previous apparitions to get estimates of more parameters.
http://www.asu.cas.cz/~asteroid/1999hf1_08a_all.png
http://www.asu.cas.cz/~asteroid/1999hf1_08a_porb.png
http://www.asu.cas.cz/~asteroid/1999hf1_08a_p1.png
http://www.asu.cas.cz/~asteroid/1999hf1_08b_all.png
http://www.asu.cas.cz/~asteroid/1999hf1_08b_porb.png
http://www.asu.cas.cz/~asteroid/1999hf1_08b_p1.png

Great work all!

Cheers, Petr [2008-06-19 11:19, Ondrejov]

· Will work from SRO again tonight. -Walt [2008-05-01 01:36, Sonoita] Message sent to observers

· Started this at 02:50 UT.
Don [2008-04-30 03:00, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Will run from SRO tonight.

-Walt [2008-04-30 02:28, Sonoita] Message sent to observers

· Just started and should cover whole event. Peter K. [2008-04-26 20:17, Ondrejov]

· I started this one at 03:10 UT.
Don [2008-04-25 03:27, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be doing a run on this tonight.
Don [2008-04-22 02:46, CarbuncleHill]

· I plan to start a run on this at 03:50 UT.
Don [2008-04-17 02:04, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Three new sessions were joined in: one from Skalnate Pleso (Apr 15.0) and two of them from Carbuncle (Apr 15.3 and 16.3). Session from SP is a bit noisy for unknown reason but those from Carbuncle have good quality. Unfortunately, Don had a telescope problem on first night what caused sparse coverage of event. HF1's ligthcurve looks like we see only one of events.

Due to very low amplitude in orbital component and shallow attenuation(s) only data with errors <0.015 mag are useful (best if linked). Don't bother in worse conditions or with smaller telescopes.

Pictures bellow were updated.

Peter [2008-04-16 15:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 04:00 UT.
Don [2008-04-16 03:53, CarbuncleHill]

· I'll be starting this at 04:00 UT.
Don [2008-04-15 02:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 21:55 UT in good conditions.Michal [2008-04-14 21:57, SkalnatePleso] [Remove]
Message sent to observers

· I observed 1999 HF1 for 5.7 hours last night and caught something like part of an event at the end of my session (needs to be confirmed by further observations). Here is 137170's current status with P_orb derived in 2005 and 2006:

http://www.asu.cas.cz/~asteroid/1999hf1_all.png
http://www.asu.cas.cz/~asteroid/1999hf1_p1.png
http://www.asu.cas.cz/~asteroid/1999hf1_porb.png

More sessions covering both events are needed for modeling this binary system at current apparition.

Peter K. [2008-04-14 17:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 3 hours yesterday in variable conditions with no event detected. Shape and amplitude of its LC is very similar to observations from past (2005 and 2006). I'm observing it also tonight (as main target from 21:15 UT). Peter K. [2008-04-13 22:29, Ondrejov] Message sent to BinAstPhotSurvey conference

(26879) Haines (Finished) [Add new note]
· Adrian and Peter K. have analyzed data taken from Modra, Carbuncle Hill, Ondrejov, and Hunters Hill: U=2+ solution with P = 2.7614 h and A = 0.07 mag. It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work all on the tough target.

Cheers, Petr [2008-06-16 13:43, Ondrejov] Message sent to observers

· The same as yesterday for this Mars crosser. Adrian [2008-06-13 21:56, Modra]

· I can see clouds disappearing here, but maybe just for a while. Not sure if my session may help. Adrian [2008-06-12 22:34, Modra] Message sent to observers

· Solution unclear (low amplitude). Petr [2008-06-12 08:15, Ondrejov]

· Observed 6th and 7th in reasonable conditions. Data reveals a possible period of 10.7 hrs with an amplitude of 0.12mag. Data sent to Petr and Peter. [2008-06-08 11:43, HuntersHill] Message sent to observers

· Observing from 21:10 UT and should get 4 hours of data. Peter K. [2008-06-06 22:05, Ondrejov]

· Don is away since today until June 15. If someone could take over this target, it would be very good; it is past opposition already and its conditions will worsen in next lunation.

Clear Skies, Petr [2008-06-06 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this new target tonight.
Don [2008-05-30 00:53, CarbuncleHill]

(7516) Kranjc (Finished) [Add new note]
· Data by Franck Marchis et al. from Lick joined in: Three of the five nights have a good quality, and they fit well with the data by others, no attenuation captured. Following pages have been updated:
http://www.asu.cas.cz/~asteroid/07516.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
The binary suspect remains unconfirmed.

Petr [2008-06-06 09:51, Ondrejov] Message sent to observers

· We sent processed photometric data collected at Lick-1m to Petr. here the info

ID Name Class StartDate StartTime EndDate EndTime Duration LC_points Filter Telescope
7516 Kranjc MB_I 6/1/2008 5:10:54 6/1/2008 9:01:11 3:50:17 37 B Nickel
7516 Kranjc MB_I 6/2/2008 4:35:00 6/2/2008 9:09:37 4:34:37 144 B Nickel
7516 Kranjc MB_I 6/3/2008 4:22:44 6/3/2008 8:28:43 4:05:59 95 B Nickel
7516 Kranjc MB_I 6/4/2008 4:43:44 6/4/2008 10:03:40 5:19:56 54 B Nickel
7516 Kranjc MB_I 6/5/2008 7:33:40 6/5/2008 9:23:56 1:50:16 26 B Nickel [2008-06-06 00:20, Marchis] Message sent to observers

· Despite an extensive effort by Julian from Leura (17 nights), by Jim from Via Capote (4 nights), by Bob from GMARS (2 nights), and by Walt, John and Dirk from SRO (2 nights), the attenuation observed by Julian on April 26 has not been confirmed. We are closing the campaign on the suspect binary now.
http://www.asu.cas.cz/~asteroid/07516.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2008-06-03 09:07, Ondrejov] Message sent to observers

· just under 6 hours of observation with good conditions. No deviations observed [2008-05-30 12:47, Via Capote]

· will begin data collection at 4:15 UT with good conditions [2008-05-30 02:51, Via Capote] Message sent to observers

· just over 6 hours of observation under good conditions. No deviations observed [2008-05-28 13:26, Via Capote]

· will begin data collection at 4:00 UT with good conditions [2008-05-28 02:42, Via Capote] Message sent to observers

· Data obtained 7:43 to 11:31 UT 2008-05-11 [2008-05-14 14:02, Via Capote]

· data obtained 7:22 to 11:32 UT 2008-05-11 [2008-05-11 23:04, Via Capote]

· More observations were done on the following days:
11:49UT to 18:57UT 2008-05-07
11:03UT to 14:57UT 2008-05-08
11:28UT to 18:54UT 2008-05-09
Data was sent in. Julian [2008-05-10 14:17, Blue Mountains Obs] Message sent to observers

· We started a run on this at 5:10 UT.

John G [2008-05-08 05:10, Sonoita] Message sent to BinAstPhotSurvey conference

· I've done the following observations:
11:28UT to 18:29UT 2008-05-04
11:42UT to 17:50UT 2008-05-05
12:31UT to 18:52UT 2008-05-06. Data sent in
Julian [2008-05-07 13:53, Blue Mountains Obs]

· We should be starting this around 5:45 UT.

John G [2008-05-07 04:54, Sonoita] Message sent to BinAstPhotSurvey conference

· Observed from GMARS on 2008-05-03 and 2008-05-04 starting at 6:00 UT. 2008-05-04 observig session interupted by clouds. [2008-05-04 20:18, Santana] Message sent to observers

· observed from 11:28UT to 18:47UT 2008-05-03 in good condition. [2008-05-04 06:27, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed from 11:01UT to 19:02UT 2008-05-02 in good condtion. Unfortunately i lost 1.7 hours worth of data due to unknown software problem under investigation. data sent in. Julian [2008-05-03 03:51, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· equipment issue limited session to 2 hours [2008-05-02 15:18, Via Capote]

· observed from 12:26 UT for 3 hours ,2008-05-01 [2008-05-02 06:34, Blue Mountains Obs] Message sent to observers

· I plan to start this target at 06:30 UT [2008-05-02 05:13, Via Capote]

· I plan to start this at 04:00 UT.
Don [2008-05-01 00:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Six nights (durations 1.9-7.7 h) by Julian from Leura: Unique period of 3.9668 h, with one night showing deviations that may be a mutual event (actually a "double" event, with both eclipse and occultation occuring temporally shifted), see
http://www.asu.cas.cz/~asteroid/07516.png
http://www.asu.cas.cz/~asteroid/07516_080426.png

Obviously, more observations are needed to capture more events so that the suspect binary nature is confirmed and orbital period derived.

Clear Skies, Petr [2008-04-30 12:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed on 2005-04-25 from 14:34 to 16:40UT and 2005-04-26 from 11:42 to 18:41UT . [2008-04-27 23:04, Blue Mountains Obs]

· observed from 12:43UT and finished at 17:21UT 2008-04-14. Data sent in. [2008-04-16 00:26, Blue Mountains Obs] Message sent to observers

· started observing this target at 13:21UT and finished at 16:00UT 2008-04-12. Preliminary data shows period about 3.3h and 0.2m amplitude. [2008-04-13 11:22, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(14465) 1993 NB (Finished) [Add new note]
· Five good nights total by Don and David have resolved this one well. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-05-29 09:39, Ondrejov] Message sent to observers

· Observed 2008-05-28 in reasonable conditions. Data refines the period to 4.9712 +/- 0.0003hrs with an amplitude of 0.4 +/- 0.03mag. No deviations detected. This will likely finish this target per correspondence with Peter K. [2008-05-29 03:44, HuntersHill] Message sent to observers

· I'll be starting this at 04:00 UT.
Don [2008-05-29 03:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed 2008-05-27 in reasonable conditions though end of session marred by fog. New data reveals a completely different period of 4.9711 +/- 0.0004hrs with an amplitude of 0.4 +/- 0.03 mag. The new data rules out the previously determined period. [2008-05-27 22:30, HuntersHill] Message sent to observers

· Observed 2007-05-22 and 2008-05-24 in poor conditions. Period refined to 5.2430 with an amplitude of 0.45 +/- 0.02 mag. Possibly some deviations but could easily be poor quality data. [2008-05-25 09:11, HuntersHill] Message sent to observers

· Starting a run at 02:00 UT.
Don [2008-05-25 01:44, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed 2008-05-14 in reasonable conditiosn though focus was lost in the later part of the session. Data refines the period to 5.24hrs with an amplitude of 0.45 +/- 0.02 mag. [2008-05-15 04:10, HuntersHill] Message sent to observers

· I started a session on this at 03:00 UT.
Don [2008-05-14 03:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed 2008-05-12 in reasonable conditions. Data indicates a possible period of around 5.1hr with an amplitude of 0.4mag. Had pointing issues last night so data was a little sparse. [2008-05-13 01:49, HuntersHill] Message sent to BinAstPhotSurvey conference

(7743) 1986 JA (Finished) [Add new note]
· Adrian has taken 12 sessions (linked per partes in blocks of 3 sessions) from Modra, and Don has taken 6 linked sessions (plus two unlinked ones). It is a slow rotator with a period near 146.8 h, U=3-. A couple sessions suggest that it may be a NPA rotator, but it is marginal (PAR = -1).
http://www.asu.cas.cz/~asteroid/07743.png
It has been done sufficiently for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work on the slow rotator, Adrian and Don.

Cheers, Petr [2008-05-27 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.
Don [2008-05-25 01:42, CarbuncleHill]

· My partial linkages indicate that the period may be about 146 h (the most probably value). Adrian [2008-05-17 10:06, Modra] Message sent to observers

· This one seems to be not so interesting. Our short runs while not linked are not enough to determine P. Adrian [2008-05-15 20:58, Modra]

· I started this at 02:40 UT. I'll try some linkage images later.
Don [2008-05-14 03:42, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I interrupted 2005 NB7 for a while to resolve the period of this slow rotator better. Adrian [2008-05-01 01:00, Modra] Message sent to observers

· I'll be starting this at 03:30 UT.
Don [2008-05-01 00:40, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting a run at 03:40 UT.
Don [2008-04-30 03:02, CarbuncleHill]

· Hi Don (and all binasters),

By chance, two weeks ago, I tried to observe (7743) on three consecutive nights - from Apr 4 to Apr 6, but all were very short sessions done in the morning after other target was no more than 30 degrees above horizon. At that time it was not in Petr's list and I didn't add it to the web tool due to very short sessions, though it formally fitted criteria for the survey. Only now, after a note from Don I realized that such number is somehow familiar with me. Yes, I also noticed it was probably fainter than expected. I wanted to look at it better this week, but the weather was against. Later even the Moon plans to be against - due to its angular closeness.
No significant changes were noticed during the individual sessions - no wonder for noisy data. I'm not sure, but according to my quick linkages, there is a hint for a long period.

Adrian [2008-04-16 15:36, Modra] Message sent to observers

· The run of April 16 was unsuccessful due to a crowded field. Target seems dimmer than expected.
Don [2008-04-16 15:08, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting this new target at 04:45 UT.
Don [2008-04-16 03:56, CarbuncleHill]

(28434) 1999 XL176 (Finished) [Add new note]
· David's observations on five nights during May 9-24 have shown that this one is a slow rotator. We close it for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-05-27 10:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-05-22 and 2008-05-24 in poor conditions. Not making any headway with this target and it it now getting too faint. [2008-05-25 09:16, HuntersHill] Message sent to observers

· Observed 2008-05-14 in reasonable conditions though focus was lost in the later part of the session. Data indicates a possible monomdal period of approx 46hrs with an amplitude of somewhat greater than 0.5mag. [2008-05-15 04:12, HuntersHill] Message sent to observers

· Observed 2008-05-12 in reasonable conditions. Data still indicates a longish period - perhaps around 39hrs with an amplitude of 0.25mag. [2008-05-13 01:50, HuntersHill]

· We'll be starting this around 4:30 UT if the clouds hold off.
John G [2008-05-12 03:14, Sonoita] Message sent to BinAstPhotSurvey conference

· Observed 2008-05-09 from 09:57UT to 18:41UT in reasonable conditions. Data shows a continual decline over the 9 hrs period of observation indicating that the period is greater than 30hrs with an amplitude greater than 0.3 +/- 0.03mag. [2008-05-10 09:22, HuntersHill] Message sent to BinAstPhotSurvey conference

(4533) Orth (Finished) [Add new note]
· Several periods on an order of several hours possible, U=2-. Have not been done well enough for the Survey. [2008-05-26 14:22, Ondrejov]

· We started observing it today mMay 12 UT at 4 UT. we will continue to observe it until 730 UT. Same program tomorrow if necessary. [2008-05-13 05:10, Marchis] Message sent to BinAstPhotSurvey conference

· Observed for almost 4 hours last night (in variable conditions) and for 1.5 hours tonight (much better sky). Maybe I will take one more session tonight (while observing HF1). Peter K. [2008-04-13 21:06, Ondrejov] Message sent to observers

· I obtained 3 short sessions within 2 hours last night and hoping weather will alow linkages tonight. Peter K. [2008-03-15 10:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· data obtained from 09:47UT to 13:30 UT 2008-03-10 showing constant decline by about 0.02mag . Julian [2008-03-12 13:49, Blue Mountains Obs]

· Observed 2008-03-09 from 07:00 to 11:00 UT from GMARS. No variation in brightness in 4 hours. [2008-03-09 15:09, Santana] Message sent to BinAstPhotSurvey conference

2005 NB7 (Finished) - NEA binary detected by radar [Add new note]
· Our report on photometric observations of the NEA binary has appeared on CBET 1383. In the meantime (after we submitted the report to CBAT) I have received additional data taken by Ninel from Simeiz and by Yura from Kharkiv during May 1-5 (three full-night and two short sessions). They fit reasonably with the data from the other three stations reported on the CBET.

Cheers, Petr

2005 NB_7
P. Kusnirak and P. Pravec, Ondrejov Observatory; A. Galad and L. Kornos,
Modra Observatory; and W. Cooney, J. Gross, and D. Terrell, Sonoita Research
Observatory, Sonoita, AZ, U.S.A., report that photometric observations
obtained during Apr. 30-May 11 reveal the following information for the
binary minor planet 2005 NB_7 (cf. IAUC 8936): orbital period = 15.28 ±
0.01 hr (same as the secondary's rotation period); primary's rotation period
= 3.4883 ± 0.0002 hr; primary's lightcurve amplitude = 0.13 mag, suggesting
a nearly spheroidal shape; secondary's lightcurve amplitude = 0.09 mag; lower
limit on the secondary-to-primary mean-diameter ratio = 0.32.

(C) Copyright 2008 CBAT
2008 May 23 (CBET 1383) Daniel W. E. Green [2008-05-26 13:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Peter K. has observed it from here on two more nights, and he has also linked five of his seven nights. Updated solution (periods unique):
P_1 = 3.4882 +/- 0.0002 h
P_orb = 15.28 +/- 0.01 h
Secondary's rotation is synchronous (P_2 = P_orb)
A_1 = 0.13 mag
A_2 = 0.09 mag
D_2/D_1 >= 0.32
http://www.asu.cas.cz/~asteroid/2005nb7_all.png
http://www.asu.cas.cz/~asteroid/2005nb7_porb.png
http://www.asu.cas.cz/~asteroid/2005nb7_p1.png
http://www.asu.cas.cz/~asteroid/2005nb7_p1_nsp.png

Remaining ambiguity on which one of the observed events is "primary" and which is "secondary" is unlikely to be resolved with more observations during the last few days of the apparition. If it is resolved with Mike Shepard et al.'s analysis of the radar observations, we will be able to constrain D_2/D_1 better.

In any case, our photometric campaign on the NEA binary is over now. Incidentally, we all participating in the campaign (Peter K., Adrian, Leos, and I) will meet on a seminar tomorrow, so we will send a report for CBET to Dan Green tomorrow.

Cheers, Petr [2008-05-11 15:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started last night on this target. As P_orb is now unique I will only improve coverage of some phases tonight. Peter K. [2008-05-10 20:05, Ondrejov] Message sent to observers

· My observation from last night (6-hours long) ruled out longer P_orb (40.73 h) and both periods are now unique. Peter K. [2008-05-10 07:22, Ondrejov]

· Observing from 20 UT. Peter K. [2008-05-09 22:26, Ondrejov] Message sent to observers

· Two 6-h long sessions by Leos from Modra and by Peter K. from here of 2008 May 8.0 and 9.0: Periods are unique or very nearly so:
P_1 = 3.4880 +/- 0.0003 h
P_orb = 15.275 +/- 0.01 h
Secondary's rotation appears synchronous with orbital motion (P_2 = P_orb).
http://www.asu.cas.cz/~asteroid/2005nb7_all.png
http://www.asu.cas.cz/~asteroid/2005nb7_porb.png
http://www.asu.cas.cz/~asteroid/2005nb7_p1.png
http://www.asu.cas.cz/~asteroid/2005nb7_p1_nsp.png
Re. P_orb: It is unique if I assume that only occultation or eclipse (but not both) have occured there. A solution of 40.73 h (= 8/3 * 15.275 h) with both occultation and eclipse events occuring there ("double events", but spatially/temporally separated) is not formally ruled out, though it appears unlikely, but nonetheless would be good to rule out it for certainty with more observationsw. But it may be resolved very soon; a critically placed night may nail it down immediately.

There remains an ambiguity on which one of the events is "primary" and which is "secondary". At solar phases about 60 deg, a primary event that is caused by a transit of the secondary in front of the primary may be shallower than a secondary event because of an uneven distribution of surface brightness on visible disk of the primary at the high solar phase. I am not sure whether more photometric data during this apparition will be able to resolve it. Another possibility is that a combination with radar observations by Shepard et al. may resolve the issue .... At this moment, we can give a lower limit on D_2/D_1 of 0.32.

Cheers, Petr [2008-05-09 13:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:05 UT. Peter K. [2008-05-08 21:26, Ondrejov] Message sent to observers

· We are planning this one tonight, with an expected start at ~20 UT. Jozef, Leos [2008-05-07 18:25, Modra] Message sent to BinAstPhotSurvey conference

· Four more nights (1.7-5.3 h long) by Peter K. from here and one night by Leos from Modra. Two more attenuations attenuations captured, but a solution is not clear yet. A tentative solution (but not much plausible for the orbital component):
http://www.asu.cas.cz/~asteroid/2005nb7_all.png
http://www.asu.cas.cz/~asteroid/2005nb7_porb.png
http://www.asu.cas.cz/~asteroid/2005nb7_p1.png

More data (long or linked sessions).

Clear Skies, Petr [2008-05-07 11:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 20 UT and hoping for full-night session. Peter K. [2008-05-06 20:14, Ondrejov] Message sent to observers

· Observing from 20:05 UT but awaiting clouds within 2 hours or so. Peter K. [2008-05-04 21:05, Ondrejov]

· Observed for 5.5 hours last night in variable conditions (passing high clouds). Something like event there but data are of lower quality and may not be used later. Peter K. [2008-05-04 07:48, Ondrejov] Message sent to observers

· We started this tonight at 4:35 UT with variable high clouds. If the sky holds we should get a good, long run.

John G [2008-05-04 04:39, Sonoita]

· Observing from 20:35 UT but don't know what weather will allow. Peter K. [2008-05-03 21:18, Ondrejov] Message sent to observers

· First one and half nights by Adrian from Modra and by Peter from here show a fast variation with superimposed attenuations on both nights. A tentative solution:
http://www.asu.cas.cz/~asteroid/2005nb7_all.png
http://www.asu.cas.cz/~asteroid/2005nb7_porb.png
http://www.asu.cas.cz/~asteroid/2005nb7_p1.png
The depth of the observed events gives a preliminary estimate for the size ratio D_2/D_1 of 0.40 +/- 0.02. The periods are not unique; the primary period can be shorter (a period 2.33 h fits as well), and there are a few possible solutions for orbital period. More observations are needed to capture more events for the non-Survey binary.

Clear Skies, Petr [2008-05-02 11:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started my first attempt on this binary NEA. Peter [2008-05-01 20:35, Ondrejov] Message sent to observers

· Maybe I could start it tonight for a while depends mainly on weather. Adrian [2008-04-30 19:33, Modra] Message sent to BinAstPhotSurvey conference

(15533) 2000 AP138 (Finished) [Add new note]
· Worked by Don from Carbuncle Hill on six nights (5 of them linked), by Peter and Kamil from here on three nights (calibrated R), by Brian from Palmer Divide Observatory, Bob from GMARS, Judit from McDonald, and Julian from Leura (1 night from each). Thanks to overlaps between observations from Carbuncle Hill, Ondrejov, and PDO, their nine sessions have been effectively linked together, and to the Cousins R. Unique period solution of 114 h, see
http://www.asu.cas.cz/~asteroid/15533.png
The solution assumes a single periodicity, but the data are not abundant enough to show or rule out a possible non-principal axis rotation.

Nice work, Don, Peter, and all. It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-05-02 09:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting at 3:30 UT under good conditions. I hope to get about 5 or 6 hours coverage.

Judit [2008-04-06 03:24, McDonald Observatory] Message sent to observers

· Doing a run on this tonight.
Don [2008-03-30 02:26, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this one at 00:50 UT.
Don [2008-03-27 00:59, CarbuncleHill]

· Started this about 0330 UT. [2008-03-25 03:31, PalmerDivide] Message sent to observers

· Doing a run on this tonight.
Don [2008-03-25 03:21, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don's first night has shown a rapid variation (period needs to be established with more data) with amplitude ~0.07 mag, to which there is superimposed a trend (brightness decrease) by 0.08 mag throught the session, see
http://www.asu.cas.cz/~asteroid/15533.png

Don may not be able to take more data of good quality until after full moon, so I encourage others to help out. Long sessions with errors <=0.02 mag are needed.

Clear Skies, Petr [2008-03-14 09:50, Ondrejov] Message sent to BinAstPhotSurvey conference

(7676) 1995 WN8 (Finished) [Add new note]
· Done sufficiently by Don with 7 linked nights: P = 21.61 +/- 0.01 h with best fit G=0.3. A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don.

Cheers, Petr [2008-04-11 12:54, Ondrejov] Message sent to observers

· Doing this tonight. I'll also be getting linkage images if conditions stay good.
Don [2008-04-09 01:46, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Statrted a run at 00:50 UT.
Don [2008-03-27 00:58, CarbuncleHill]

· Observing from 22:40 UT in good conditions. Michal [2008-03-26 22:54, SkalnatePleso] [Remove]
Message sent to observers

· Run stopped due to mount problem.
Don [2008-03-11 04:14, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I must be testing the web tool's ability to handle non-standard names! The asteroid should be listed as (7676) 1995 WN8 of course.
Don [2008-03-11 03:24, CarbuncleHill]

· I started this new target tonight. Clouds may interfer later. What else is new.
Don [2008-03-11 03:22, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(8663) 1991 DJ1 (Finished) [Add new note]
· Done, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2008-04-10 14:43, Ondrejov]

· Started a run at 00:50 UT.
Don [2008-03-25 03:22, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting run of this one. Best wishes, Kamil [2008-03-09 19:55, Ondrejov] Message sent to observers

· Observing this one from 22:55 UT. I hope in some hours long run if weather permit. Best wishes, Kamil [2008-03-07 22:56, Ondrejov]

· Starting this new target at 02:30 UT.
Don [2008-03-06 01:17, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4425) Bilk (Finished) [Add new note]
· closing this one. [2008-04-10 13:49, Ondrejov]

· I worked this this evening but the data are probably too noisy for the survey but are good enough to find a reasonably secure period.

Data sent to Petr. [2008-03-19 07:28, PalmerDivide] Message sent to observers

· A couple more nights are needed for this target to nail down its solution and to complete coverage. Brian will be probably clouded out after tonight, so I encourage someone to help out.

Clear Skies, Petr [2008-03-11 10:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two nights. Period refined to 5.466 ± 0.002 h, amplitude 0.42 ± 0.03 mag. Another night needed. [2008-03-11 08:40, PalmerDivide] Message sent to observers

· Working this tonight (March 11 UT). [2008-03-11 03:55, PalmerDivide]

· Started working this. It may be too noisy for Survey. However, after only an hour or so it's showing > 0.20 mag amplitude. [2008-03-08 04:29, PalmerDivide] Message sent to BinAstPhotSurvey conference

(4806) Miho (Finished) - finished after 8 nights from SRO [Add new note]
· This slow rotator was observed by Walt Cooney at SRO on 8 nights (from Mar 10 to Apr 04). Its period is 64 hours (unique) and amplitude of 0.86 mag. It is finished for Survey. Nice work, Walt!

Peter [2008-04-06 20:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Walt has written on the past night:
SRO started 4806 Miho last night. Got a monatonically rising curve for our ~five hour run. Data sent to Petr.

Yes, it is a slow(ish) rotator. Period probably >20 h. Two full consecutive nights (but not necessarily dense sampling; it may be worked -alternated- together with another target) would provide a better constraint.

Clear Skies, Petr [2008-03-11 08:52, Ondrejov]

(2912) Lapalma (Finished) [Add new note]
· Period of 5.7108 h (ampl. of 0.9 mag) is unique with sufficient coverage and no deviations. The target is finished. [2008-04-04 07:44, Ondrejov]

· Don Pray has observed this target on three nights (Mar 10, 11 and Apr 03). [2008-04-04 07:41, Ondrejov]

(7369) Gavrilin (Finished) - Synchronous binary candidate [Add new note]
· Peter has finished calibrations of his&Kamil's R observations of the synchronous binary candidate. It has been finished for the BinAstPhotSurvey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work all on the somewhat tough object.

Cheers, Petr [2008-03-17 12:54, Ondrejov] Message sent to observers

· More data have been taken for the synchronous binary candidate since my last report:
2008-02-8.9, 9.9, 10.9, 12.8, and 15.8 by Peter and Kamil from here
2008-02-9.1 by Don from Carbuncle Hill
2008-02-9.9 and 10.9 by Gabo and Marek from Skalnate Pleso
2008-02-11.9, 13.8, and 15.8 by Jozef, Leos, and Stefan from Modra
2008-02-12.5 by David from Hunters Hill.
Most of the observations covered phases outside events. A part of an event has been covered by David before the end of his Feb. 12.5 session. The session of Feb. 15.8 by Jozef and Stefan then covered phases right in the lightcurve minimum, but they showed only a marginal attenuation. It appears that we have already moved almost out of the events geometry. The asteroid's apparition is effectively over now; more observations in the next lunation would require a meter-class telescope to get a needed accuracy. A publication of the suspected synchronous binary (with only a lower limit on D_2/D_1 estimated, as the events that David observed during 2007 Dec. 28-30 might not be total) will be done after calibrations of the Ondrejov R observations are completed.
http://www.asu.cas.cz/~asteroid/07369.png

Cheers, Petr [2008-02-21 16:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 17:22 UT. Jozef, Stefan [2008-02-15 17:31, Modra]

· This object this night from 17:15 UT. Gabo [2008-02-14 16:28, SkalnatePleso] [Remove]
Message sent to observers

· Finished at 20.30 UT, fog came in, we are probably out of business for the rest of the night. Jozef [2008-02-13 21:45, Modra]

· Started at 18h UT. Jozef [2008-02-13 18:12, Modra]

· If you have fog in Ondrejov, we can take this tonight. We are currently just above the fog level. It is uncertain, but all night could be clear as well. Jozef [2008-02-13 17:49, Modra] Message sent to BinAstPhotSurvey conference

· Observed 2008 02 12 from 10:08UT to 16:01UT in average conditions. Focus went a little off in the later part of the session. The data may fit one of the suspected events. [2008-02-12 22:03, HuntersHill] Message sent to observers

· I will try to get 2-3 hours long run for this one from 18 UT if weather hold. Best wishes, Kamil [2008-02-12 16:53, Ondrejov]

· Started this at 02:40UT and will overlap with Modra (wind permitting).
Don [2008-02-12 02:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· All right we can take it over from here, weather seems favourable. Jozef, Leos [2008-02-11 19:22, Modra] Message sent to observers

· Aborted this target for tonight without any useful data due to clouds. I will try some brighter target later tonight if weather permit. Best wishes, Kamil [2008-02-11 18:49, Ondrejov]

· This object observed from 17:37 UT to 01:09 UT, February 10/11. Gabo [2008-02-11 04:22, SkalnatePleso] [Remove]
Message sent to observers

· Observing this one in good conditions. Best wishes, Kamil & Peter [2008-02-10 17:59, Ondrejov]

· This object observed from 20:20 UT to 01:00 UT, February 9/10. Gabo [2008-02-10 04:54, SkalnatePleso] [Remove]
Message sent to observers

· Observing this one tonight. Best wishes, Kamil [2008-02-09 22:06, Ondrejov]

· Started this one at 01:00 UT in good conditions now, but uncertain later.
Don [2008-02-09 01:13, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing this one in unpredictable weather conditions from 18:15 UT with bright star ahead. I will try to continue on 2007 TU24 later when clouds permit. Best wishes, Kamil [2008-02-08 18:30, Ondrejov] Message sent to observers

· More data have been taken for the synchronous binary suspect. Long or linked sessions have been taken by Peter and Kamil (2008 Jan. 30.0, Feb. 2.9 and 3.8) and by Don (Jan. 29.2). Available data are consistent with a period near 49 hours, but the solution hasn't been nailed down yet; no more event has been captured, and data outside events covering the rotational lightcurve are not abundant enough yet for a really good solution for the rotational component only. More data are still needed (long or linked sessions) to establish this one well.
http://www.asu.cas.cz/~asteroid/07369.png

Clear Skies, Petr [2008-02-04 16:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one up to 21:00 UT. Best wishes, Kamil [2008-02-03 20:37, Ondrejov] Message sent to observers

· Observing from 19:35 UT and expecting full-night run. Peter K. [2008-02-02 21:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one tonight.
Don [2008-01-31 02:00, CarbuncleHill]

· I plan to start this at about 00:45 UT.
Don [2008-01-28 21:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 19:30 UT in average conditions. Session closed at 21:00 UT, overcast. Michal [2008-01-28 21:48, SkalnatePleso] [Remove]
Message sent to observers

· Doing a run on this tonight.
Don [2008-01-19 03:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Six nights by David from Hunters Hill and one night by Don from Carbuncle Hill showed relatively slow, gradual brightness changes most of the time, but on the first three nights, there occured more rapid features, apparent attenuations. They may be eclipses with a period of 24.6 or 49.2 h, and the brightness trends outside them may be a rotation of one or both components. We don't see any prominent 2nd period in the available data, so it may be a fully synchronous system. (The other possibility that a fast rotating primary has a very low lightcurve amplitude cannot be ruled out, but the amplitude of the observed rotation lightcurve would require a large secondary if it belonged to it.) If it is indeed a fully synchronous system and if it has D_2/D_1 similar to other known small synchronous binaries (which have nearly equal sized components), we would expect much deeper events if the eclipses were total. So, it looks that the eclipses are partial, and we should see some evolution there during next weeks. Ok, we will see whether the working model is confirmed with more good long or linked data.
http://www.asu.cas.cz/~asteroid/07369.png

Clear Skies, Petr [2008-01-18 09:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting a run on this at 01:40 UT.
Don [2008-01-17 00:27, CarbuncleHill]

· Six nights by David from Hunters Hill indicate a period nearly commensurate with 1 or 1/2 day. Very useful to nail it down could be if someone in Europe or USA took one full night, I encourage you to help out David.

Clear Skies, Petr [2008-01-16 15:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008 01 15 from 11:02UT to 17:05UT in diminishing conditions. Vague fit to 12.2hr data but not a great fit. Data sent to Peter. [2008-01-16 08:10, HuntersHill] Message sent to observers

· Observed 2008-01-10 from 11:21UT to 17:48UT in good conditions. Target in a crowed field requiring 7 star subtractions but resulting data is in agreement with previous nights run indicating a period of 12.217 +/- 0.008hrs with an amplitude of 0.36 +/- 0.03mag. Given the conditions and the density of the star field the target has been observed in, it is not possible to attribute any curve deviations to anything other than observational defects. [2008-01-11 01:56, HuntersHill] Message sent to observers

· Observed 2008-01-09 from 11:23UT to 17:58UT in poor conditions. The first hour of data was tossed due to cloud, high humidity and poor seeing. The new data does not fit the previous data (no obvious overlap) extending the possible period to 12.3 +/- 0.1hrs with an amplitude of 0.36+/- 0.03mag [2008-01-10 04:23, HuntersHill] Message sent to observers

· Observed 2007 12 30 from 12:28UT to 17:40UT in average conditions. Period refined to 8.20 +/- 0.02hrs with and amplitude of 0.2 +/- 0.03mag. Observing basically the same part of the curve each night so will leave this one and move to a new target and pick it up again later unless someone in the US/Europe wishes to pick it up. [2007-12-31 02:14, HuntersHill] Message sent to observers

· Observed 2007-12-29 from 12:31UT to 17:35UT in good but warm conditions. Better SNR tonight and data reveals a period of 8.19 +/- 0.03hrs with an amplitude of 0.2 +/- 0.03mag. [2007-12-30 01:06, HuntersHill]

· Observed 2007-12-28 from 12:40UT to 17:41UT in good conditions. Target appears fainter than expected though small loss in SNR due to presence of the moon. Data indicates a period around 8-10hrs with an amplitude of 0.25 +/- 0.04mag. [2007-12-29 07:42, HuntersHill] Message sent to BinAstPhotSurvey conference

(1797) Schaumasse (Finished) [Add new note]
· David has done this one from Hunters Hill with two long nights: unique solution, sufficient coverage, no deviation. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, David.

Cheers, Petr [2008-03-14 10:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-03-13 in good conditions. Data refined period to 6.102 +/- 0.005hrs with an amplitude of 0.62 +/- 0.01mag. No deviations detected. Data sent to Peter. [2008-03-13 22:27, HuntersHill] Message sent to observers

· Observed 2008-03-12 from 11:12UT to 18:29UT in good conditions. Data reveals a period of 6.0 +/- 0.1 hrs with an amplitude of 0.6 +/- 0.01mag. [2008-03-12 21:14, HuntersHill] Message sent to BinAstPhotSurvey conference

(1855) Korolev (Finished) [Add new note]
· This one has been done by Don from Carbuncle Hill and by David from Hunters Hill: Unique solution, good coverage, some deviations seen in the first two nights are suspected to be observational artifacts rather than real features in the asteroid. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-03-11 10:50, Ondrejov] Message sent to observers

· Observed 2008-03-07 from 10:36UT to 18:29UT in good conditions. Period refined to 4.7221 +/- 0.0004hrs with an amplitude of 0.8 +/- 0.02mag. [2008-03-08 04:47, HuntersHill]

· An error in my observing plan meant I missed this target last night :( [2008-03-06 20:50, HuntersHill] Message sent to observers

· I'll be starting this one at 02:30 UT.
Don [2008-03-06 01:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed 2008-02-29 from 11:16UT to 18:00UT in good conditions. Data reveals a period of 4.67 +/- 0.02hrs with an amplitude 0.75 +/- 0.02mag [2008-03-01 02:31, HuntersHill] Message sent to observers

· Started this new target at 03:00 UT.
Don [2008-02-29 03:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4375) Kiyomori (Finished) [Add new note]
· This one has been worked by Jozef, Stefan, and Leos from Modra (5 partial nights) and by Vasilij Chiorny from Kharkiv (1 full night): Unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/04375.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-03-11 08:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed this target from 0:30-3:30 UT. Data will be linked with yesterday's session. Jozef, Leos. [2008-02-27 04:24, Modra]

· Started this at ~1 UT. Jozef, Leos. [2008-02-26 01:01, Modra] Message sent to BinAstPhotSurvey conference

· Started with it at 2:15 UT on Feb.18, 2008.

Stefan [2008-02-18 02:22, Modra]

· We'll be doing this till 4:30 UT, to finish the night. Jozef, Stefan. [2008-02-17 02:40, Modra]

(5783) Kumagaya (Finished) [Add new note]
· This one has been done by David from Hunters Hill (2 nights) and by Kamil from here (half night): Unique solution, good coverage, no deviation,
http://www.asu.cas.cz/~asteroid/05783.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-03-05 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2008-03-03 from 10:11UT to 17:33UT in good conditions. Data refines period to 3.658 +/- 0.003hrs with an amplitude of 0.25 +/- 0.025mag. A couple of wayward points but no clear indication of any deviations. [2008-03-03 21:26, HuntersHill] Message sent to observers

· Observing this one from 19 UT in windy and partly cloudy conditions. Best wishes, Kamil [2008-03-02 21:31, Ondrejov]

· Observed 2008-03-01 from 10:17UT to 17:44UT in good conditions. Data reveals a period of around 3.7 +/- 0.1hrs with an amplitude of 0.2mag. My data is somewhat noisy with errors right on the BINAST limit. [2008-03-01 21:46, HuntersHill] Message sent to BinAstPhotSurvey conference

(4450) Pan (Finished) - Tumbling slow rotator. [Add new note]
· Seven nights have been taken by Albino from Saint Barthelemy and by Adrian from Modra. The data show it to be a slow rotator, not fitting with a single period; apparent tumbler. Adrian will complete linkages of his data. Anyway, the asteroid is finished for the Survey now,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-02-25 15:33, Ondrejov] Message sent to observers

· This Apollo asteroid has been worked by Albino from Saint Barthelemy on 2008 Feb. 6.0, 6.9, and 7.9 and by Adrian from Modra on Jan. 26.1 and Feb. 9.0. It appears to be a slow(ish) rotator, but its period cannot be really established from the available data (nights unlinked so far), see following plot where the data were folded with arbitrary period and nightly magnitude zero points:
http://www.asu.cas.cz/~asteroid/04450.png
Slow rotators of a size of (4450) are mostly tumblers, so this one might be tumbling as well. More data (and linkages of the data obtained so far) could show it, but the current window for photometry will end soon, as the asteroid accelerates rapidly in the sky as it approaches during these days. If you work it, take long or linked sessions.

Clear Skies, Petr [2008-02-10 16:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'm back for this. Adrian - volunteer of myself :-) [2008-02-09 01:05, Modra] Message sent to observers

· Good to see that Albino can continue with this. I also wanted to observe this NEA tonight (and yesterday), but clouds were against. According to Petr's tentative possible solution from available data (mine and those by Albino) the rotation period could be about 46.3 h. For the binast it would not be so important to nail it down, but for the planned radar observation it could be useful. So, while P is close to 48 h, the continuation of Albino's observation from out of Europe would be valuable (if weather permits). Good luck - with fingers crossed for volunteers :-)

Adrian [2008-02-07 20:48, Modra] Message sent to observers

· Started a new run at 20:20 UT, clear sky and good seeing. Probably not a very long rotator, amplitude about 0.2 mag.

Albino [2008-02-07 20:26, OAVdA (B04)] Message sent to BinAstPhotSurvey conference

· Started a new run at 20 UT in poor seeing conditions due to very strong wind.

Albino [2008-02-06 21:01, OAVdA (B04)]

· Started a run at 22:36 UT. Already observed on January 19 during 3h session but in poor sky conditions. I agree with Adrian that probably is a long rotator.

Best, Albino [2008-02-05 22:43, OAVdA (B04)] Message sent to BinAstPhotSurvey conference

· Just informing that my data from yesterday show continuous decrease in brightness during 4 h session by about 0.09 mag (while the noise of data was about 0.02-0.03 mag). So it seems the asteroid is a long period rotator. A strong wind is predicted here for upcoming two nights so obsevations can hardly be planned. Adrian [2008-01-26 15:41, Modra] Message sent to observers

· Far from ideal conditions due to wind (and Moon). I just try it for a while. Adrian [2008-01-26 00:24, Modra] Message sent to BinAstPhotSurvey conference

(3700) Geowilliams (Finished) - Slowish rotator (U=3), done by David Higgins [Add new note]
· [2008-02-25 08:16, HuntersHill]

· Observed 2008 02 12 from 10:26UT to 18:00UT in average conditions (though the focus went off somewhat during the night). Data now reveals a period around 17.8hrs with an amplitude of 0.75 +/- 0.02mag [2008-02-12 21:47, HuntersHill] Message sent to observers

· Observed 2008 01 15 from 12:44UT to 17:13UT in diminishing conditions. Data extends the possible fits to anything between 11.5 and 14.8hrs (best fit at 14.4hrs) with an amplitude of 0.44 +/- 0.02mag. [2008-01-16 07:23, HuntersHill] Message sent to observers

· Observed 2008-01-10 from 13:16UT to 17:58UT in good conditions. Data reveals a curve showing what amounts to approx 1/4 of a bimodal curve indicating a period of not less than 18hrs with an amplitude of >= 0.42 +/- 0.02mag [2008-01-11 00:57, HuntersHill] Message sent to BinAstPhotSurvey conference

(72396) 2001 CU20 (Finished) [Add new note]
· We have not succeeded to get sufficient data for a unique solution. Closing it. Petr [2008-02-19 12:27, Ondrejov]

· Doing a run on this one tonight.
Don [2008-01-31 02:00, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Perhaps this will be the elusive full night I can never get for this asteroid. Started at 00:01 UT.
Don [2008-01-29 01:51, CarbuncleHill]

· Six partial nights taken for this one: three by Albino from Saint Barthelemy, two by Don from Carbuncle Hill, and one by Michal and Marek from Skalnate Pleso. They have shown a ~0.1-mag variation with a period on an order of 9 h, see a tentative composite:
http://www.asu.cas.cz/~asteroid/72396.png
Two full nights (not necessarilly from one station) could establish it, I encourage observers able to work it with errors <0.02 mag to help out.

Clear Skies, Petr [2008-01-16 15:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Session started at 18:55 UT in a variable windy, but good sky conditions. No prediction. Not sure to cover longer period due to wind condition. Michal [2008-01-15 19:25, SkalnatePleso] [Remove]
Message sent to observers

· I started a run on this at 00:40 UT.
Don [2008-01-08 00:54, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Albino has observed this one from Saint Barthelmy Observatory on three nights with durations 2.7-6.1 h. His data show a low amplitude (<0.1 mag) on each of the nights, several periods in a range 3 to ~16 h appear possible, see
http://www.asu.cas.cz/~asteroid/72396.png
Albino cannot take really high quality data needed for the low amplitude object now, so a take over of the target by another station able to work the V~14.5 asteroid with errors not greater than 0.01 mag is needed. A couple full consecutive high quality nights might establish it.

Clear Skies, Petr [2007-12-18 14:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started new run from 20:56 UT, December 14. Small amplitude lightcurve, uncertain period. [2007-12-15 02:01, OAVdA (B04)]

· Started new run from 20:28 UT, December 13.

Albino [2007-12-14 00:37, OAVdA (B04)] Message sent to BinAstPhotSurvey conference

· Started a run at 22:15 UT

Albino [2007-12-12 22:37, OAVdA (B04)]

2007 TU24 (Finished) - slow rotator [Add new note]
· The small NEA has been observed by Peter and Kamil from here (9 calibrated R nights) and by Ninel and Yura from Simeiz (1 relative night). It is a tumbler, no single period fits the data, a characteristic frequency seen on most nights corresponds to a period roughly 26 hours,
http://www.asu.cas.cz/~asteroid/2007tu24.png
It has been done enough for the Survey, closed.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-02-19 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one in good conditions. Kamil & Peter [2008-02-10 20:27, Ondrejov] Message sent to observers

· Observing this one tonight as second target. Best wishes, Kamil [2008-02-10 00:23, Ondrejov]

· Observing this one under variable conditions (good seeing but clouds). If weather permit, I will stay on this one up to 5 UT. Best wishes, Kamil P.S.: Good luck, Don! :-) [2008-02-09 02:51, Ondrejov] Message sent to observers

· I'll be starting this at about 03:00 UT if conditions permit.
Don [2008-02-09 01:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Kamil&Peter's 3rd night 2008-02-08.1 joined in, a U=2 solution of 38 hours:
http://www.asu.cas.cz/~asteroid/2007tu24.png
The small, slow rotator is in the D-P range where tumblers predominate. The currently available data don't constrain it yet (it is PAR=0 so far), but it will be interesting to see what more observations (long or linked sessions) will show.

Clear Skies, Petr [2008-02-08 11:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Kamil's data from last night are consistent with ~38 hours period. Peter K. [2008-02-08 10:17, Ondrejov] Message sent to observers

· Observing this one from 23:30 UT and expecting end of run at about 5 UT if clouds permit. Best wishes, Kamil [2008-02-08 01:37, Ondrejov]

· Sessions (preliminarily linked) by Peter&Kamil from here on two nights 2008 Feb. 3.1 and 4.0 reveal P near 38 h. Assuming a symmetric lightcurve, it is a unique solution, but let's assign it U=2 until more data are obtained or the assumption is confirmed.
http://www.asu.cas.cz/~asteroid/2007tu24.png

For the BinAstPhotSurvey, the current status of the target -reasonably established slow rotator- is sufficient. I assume, however, that estimating its period more precisely would be useful as a support to or for a combination with the radar observations. So, I encourage other stations to take more data. (We will be probably clouded out here at Ondrejov for a few following nights.) With its current nightly window of ~9 hours for northern hemisphere stations, each full nightly session will probably cover one extremum (minimum or maximum), so even relative full night sessions should be useful. (Short relative sessions, on the other hand, will not likely be much useful, so don't bother unless you can work it most of the night.) Linked sessions of any duration will be useful, of course. Geometric circumstances of the asteroid on several following nights will be favorable for a precise estimation of its long period; the asteroid is on the outbound branch of its trajectory and its geometric conditions will change relatively little, that will facilitate an estimation of its long period.

Clear Skies, Petr [2008-02-04 15:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be giving this a try again. I was clouded out last night, and tonight isn't looking much better.
Don [2008-02-03 23:16, CarbuncleHill]

· I will be observing this one from 21:00 UT and hoping to stay on it all the night if weather permit. Can someone to continue from about 5 UT, please? Best wishes, Kamil [2008-02-03 20:41, Ondrejov] Message sent to observers

· My 4.5-hours long observations from last night revealed that TU24 is slowly rotating asteroid with period of 20+ hours and amplitude >0.25 mag (very preliminary result). If we want to derive its period more precisely colaboration from different longitudes is needed. It's still pretty bright and not so fast already. We're planing to continue tonight.

http://www.asu.cas.cz/~asteroid/2007tu24.png

Peter K. [2008-02-03 13:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Correction: I'll be starting this at *03:00 UT* to overlap with Peter's run. [2008-02-03 01:20, CarbuncleHill]

· Started this one at 1 UT and planning to observe it until 5 UT. Peter K. [2008-02-03 01:05, Ondrejov] Message sent to BinAstPhotSurvey conference

(7267) 1943 DF (Finished) [Add new note]
· This one has been done by Peter K. from here (3 linked nights) and by Don from Carbuncle Hill (2 nights): unique solution, thorough coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/07267.png
It is finished for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-02-18 14:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21 UT and will ending at 5 UT. Object should be finished then. Peter K. [2008-02-17 02:35, Ondrejov]

· I'll be starting this at 03:15 UT if the weather holds, which it probably won't.
Don [2008-02-15 00:58, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this night from 20:30 UT. Gabo [2008-02-14 16:31, SkalnatePleso] [Remove]
Message sent to observers

· I plan to start this after 7369 sets (06:18 UT for me).
Don [2008-02-12 02:50, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3401) Vanphilos (Finished) [Add new note]
· Bob Stephens has taken one more night for this one, completing coverage from Skalnate Pleso,
http://www.asu.cas.cz/~asteroid/03401.png
Info updated accordingly:
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, Gabo, Marek, and Bob.

Cheers, Petr [2008-02-13 09:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been done by Gabo and Marek from Skalnate Pleso: unique solution, no deviation, sufficient coverage,
http://www.asu.cas.cz/~asteroid/03401.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Gabo and Marek.

Cheers, Petr [2008-02-12 10:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object is observed this night from 20:00 UT. Gabo [2008-02-11 18:50, SkalnatePleso] [Remove]
Message sent to observers

· This object observed from 01:45 UT to 04:05 UT, February 11. Gabo [2008-02-11 04:24, SkalnatePleso] [Remove]

· This object observed from 01:45 UT to 04:12 UT, February 10. Gabo [2008-02-10 04:57, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(1126) Otero (Finished) [Add new note]
· Another easy one, done by Bob from GMARS (2 nights) and by Kamil&Peter from Ondrejov (1 night): unique period, no deviation, thorough coverage,
http://www.asu.cas.cz/~asteroid/01126.png
Finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-02-12 12:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· The first three hours of photometry shows 0.6 mag amplitude and period probably little bit shorter than 4 hours. Nice target for worse conditions. Best wishes, Kamil [2008-02-11 22:12, Ondrejov] Message sent to observers

· Right now I started this new bright target. Thanks to Modra observers for take over of (Gavrilin). Best wishes, Kamil [2008-02-11 19:18, Ondrejov] Message sent to BinAstPhotSurvey conference

(22275) 1982 BU (Finished) [Add new note]
· Another slow rotator done by Bob Stephens from GMARS: P = 40.42 h, U = 3.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work on this one, too, Bob.

Cheers, Petr [2008-02-11 10:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a session on 2007-12-31 from GMARS under poor conditions. Period perhaps around 40 hours. [2007-12-31 16:47, Santana] Message sent to observers

· Starting at 8:30 UT from GMARS. [2007-12-30 04:29, Santana] Message sent to BinAstPhotSurvey conference

(3236) Strand (Finished) [Add new note]
· Bob Stephens has found this one to be a slow rotator with a period of 66.13 h (U=3) with his observations from GMARS on 7 nights. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Bob.

Cheers, Petr [2008-02-11 10:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a session in on 2007-12-31 from GMARS. Period perhaps around 50 hours. [2007-12-31 16:48, Santana] Message sent to observers

· Starting at 04:30 UT from GMARS [2007-12-30 04:28, Santana] Message sent to BinAstPhotSurvey conference

(19337) 1997 AT (Finished) [Add new note]
· Five nights by Don and one night by David have revealed P=12.04 (U=2). It is closed for the Survey, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-01-16 15:30, Ondrejov] Message sent to observers

· I started this at about 00:00 UT.
Don [2007-11-30 01:10, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Second attempt since the first nights run was ruined by a mid field mag 5 star! Observed 2007-11-14 from 10:23UT to 17:14UT in reasonable conditions. Data shows low magnitude undulation that would appear to match a 12 rather than 16 hr period. Data sent to Petr. [2007-11-14 21:19, HuntersHill] Message sent to observers

· I'm doing a run on this to help constrain the period.
Don [2007-11-02 02:57, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don has observed this new target on 2 nights (Oct. 30.3 and 31.3) and its period seems to be commensurate with 12/24 hours. Current period estimates from his data are 12 or 16 hours.

Help from someone else on another longitude/continent will be useful for this slower rotator but as long as possible run is needed.

Peter K. [2007-11-01 12:15, Ondrejov] Message sent to BinAstPhotSurvey conference

(7409) 1990 BS (Finished) [Add new note]
· Don's linked data have revealed that it is a longish period (P > 10 h definitely), with most likely solutions around 30 h. We close it for the Survey, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-01-16 14:46, Ondrejov] Message sent to observers

· Doing a run on this tonight.
Don [2007-11-30 01:08, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this one tonight and attempting to link all sessions taken so far. [2007-11-14 00:32, CarbuncleHill]

· I'll be doing this one tonight.
Don [2007-11-11 23:49, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this tonight. Still can't make much sense out of the curve. More data!
Don [2007-11-10 23:07, CarbuncleHill]

· Doing this one again tonight. It's either an unusual curve or I'm just getting noisy data.
Don [2007-11-08 02:50, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 01:40ut. The first session's curve looked a bit irregular.
Don [2007-11-07 01:27, CarbuncleHill]

· This will start after 2501 finishes (around 05:30 UT).
Don [2007-11-02 03:02, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(39969) 1998 GT8 (Finished) [Add new note]
· Target fainter than predicted, behing the magnitude limit of the Survey. A non-target; closing it. [2008-01-15 15:46, Ondrejov]

· Observed 2007-11-15 from 09:58UT to 17:03UT in average conditions. 3hrs of data lost because of dewing. Target much fainter than anticipated with no real indication of a period in the data. Data reveals a low amplitude ~ 0.1 +/- 0.04mag [2007-11-15 23:52, HuntersHill] Message sent to BinAstPhotSurvey conference

(24114) 1999 VV23 (Finished) [Add new note]
· This one has been done by David from Hunters Hill (4 nights) and by Kamil&Peter from here (1 night). The one longer night from here has helped to get a unique solution. The target is finished for the Survey,
http://www.asu.cas.cz/~asteroid/24114.png
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-01-07 15:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Aborted 1293 (too faint) and started 24114. Kamil [2008-01-06 22:13, Ondrejov] Message sent to observers

· Observed 2007 01 04 and 2007 01 05 from 12:59UT to 16:30UT in less than ideal conditions (high humidity, cloud and warm weather. Data reveals a period of 9.950 +/- 0.005hrs with an amplitude of 0.23 +/- 0.02mag.

Deviations are noted at the star or end of each night but these may be attributed to the observing conditions (high airmass at the start and cloud at the end). [2008-01-06 05:12, HuntersHill] Message sent to observers

· Observed 2008-01-01 from 13:30UT to 17:56UT in reasonable conditions. Period refined to 9.77 +/- 0.07hrs with an amplitude of 0.22 +/- 0.02mag. [2008-01-02 00:20, HuntersHill]

· Observed 2007 12 31 from 12:53UT to 17:59UT in good conditions. Indications are for a bimodal fit of approx 10hrs with an amplitude of 0.25 +/- 0.02mag. [2008-01-01 04:22, HuntersHill] Message sent to BinAstPhotSurvey conference

(1810) Epimethius (Finished) [Add new note]
· Don (supported with one night from Skalnate Pleso) has safely established this one to be a slow(ish) rotator. A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2008-01-05 17:12, Ondrejov] Message sent to observers

· I started a run on this at about 04:00 UT. Wind may damage the run.
Don [2008-01-03 04:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don's data have shown a low amplitude or long period (linkages would be useful to check the latter possibility). Two full consecutive nights (from any station) could establish it. Petr [2007-12-13 14:25, Ondrejov]

· I'm doing another run on this starting at 03:30 UT.
Don [2007-12-09 03:44, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I plan to begin a run on this one at about 03:35 UT.
Don [2007-12-07 03:12, CarbuncleHill]

· Observing from 00:25 UT in good conditions. Michal [2007-12-06 00:33, SkalnatePleso] [Remove]
Message sent to observers

· I plan to start this after 8355 if conditions hold.
Don [2007-12-05 01:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting this after 8355 sets.
Don [2007-12-01 02:18, CarbuncleHill]

(8736) 1997 AD7 (Finished) [Add new note]
· Don has got a unique period estimate of 80.5 h with his linked 7 nights. The couple relative nights from Ondrejov and S. Pleso are consistent with the estimate. It is finished for the Survey, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2008-01-03 16:26, Ondrejov] Message sent to observers

· Slow(ish) rotator, but no good solution. Possible tumbler? Calibrated/linked data only would be useful; don't bother with relative data. Petr [2007-12-03 12:23, Ondrejov]

· Observing from 19:55 UT in average conditions. Michal [2007-11-20 20:07, SkalnatePleso] [Remove]
Message sent to observers

· Observing from 18:45 UT in average and windy conditions without any long prediction. Michal [2007-11-19 18:50, SkalnatePleso] [Remove]

· Doing this one tonight, and like 7049, I'll be taking linkage images for it.
Don [2007-11-14 00:33, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.
Don [2007-11-11 23:48, CarbuncleHill]

· Doing this tonight. This is a slow rotator with no estimated period as yet.
Don [2007-11-10 23:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this after 32039. It looks like a slow rotator.
Don [2007-11-08 02:46, CarbuncleHill] Message sent to observers

· Started this new target at 02:45 UT.
Don [2007-11-02 03:03, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4703) Kagoshima (Finished) [Add new note]
· This one with an amplitude of 0.03 mag has remained a U=2 solution (6 nights by Don and 3 nights by David),
http://www.asu.cas.cz/~asteroid/04703.png
It is only a second asteroid in the size range D<15 km with so low amplitude for which a period has been estimated at U=2 level! To establish it uniquely (U=3), very high accuracy data with errors about 0.005 mag or lower would be needed. Such are beyond capabilities of people with a time to work the target now, so we are closing it. Summary data put to the file linked on
http://www.asu.cas.cz/~ppravec/newres.htm
but the object is not included into the BinAstPhotSurvey sample as its period has not been established uniquely. Nevertheless, it was a very good work on the tough case, Don and David.

Happy New Year!

Cheers, Petr [2008-01-03 13:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· David and Don have taken two new good sessions on Dec. 12.6 and 13.1. They are really good data, with mean photometric errors <0.01 mag. A likely period is 4.093 +/- 0.001 h, see
http://www.asu.cas.cz/~asteroid/04703.png
but it is of course only a U=2 solution, as a few longer periods with more complex lightcurve shapes are possible as well. I am not sure whether more data for the asteroid (which came through opposition a week ago) would improve its solution significantly; Don and David, it's up to you whether you will work it more (on best nights only), or if we close it right away. It is only the second asteroid in the Harris and Warner LC dabatase with amplitude 0.03 mag and period estimated on U=2 level!

Cheers, Petr [2007-12-14 11:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:45 UT. Good conditions now, but they may not last all night.
Don [2007-12-13 00:53, CarbuncleHill]

· Observed 2007-12-12 from 10:32UT to 16:45UT in average conditions with broken data toward the end as cloud moved in. Very low amplitude light curve with a possible fit around 3.00hrs. Data sent to Petr. [2007-12-12 21:08, HuntersHill] Message sent to observers

· Don has worked this one on five nights, found it to show a low amplitude of 0.03-0.04 mag. Several periods possible, a following plot is for one of them:
http://www.asu.cas.cz/~asteroid/04703.png
Though the amplitude is very low, it is not an entirely hopeless case, as there appear to be characteristic features in the lightcurve that might allow a unique resolution of its period if high quality data with photometric errors about 0.005 mag are taken. If there is someone able to take such high quality data for the V=15 asteroid on two consecutive nights, I encourage to do it.

Cheers, Petr [2007-12-10 15:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start a run on this at about 00:30 UT.
Don [2007-12-08 22:24, CarbuncleHill]

· I started this at 01:00 UT.
Don [2007-12-07 01:03, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 01:25 UT.
Don [2007-12-05 01:59, CarbuncleHill]

· Doing another run on this tonight.
Don [2007-12-01 02:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I starting this new target at 01:20 UT.
Don [2007-11-30 01:12, CarbuncleHill]

(8828) 1988 RC7 (Finished) [Add new note]
· David has done this one from Hunters Hill: unique period, no deviation. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-12-21 09:42, Ondrejov] Message sent to observers

· Observed 2007-12-04 from 11:00UT to 15:07UT in average conditions. Data refined period to 12.935 +/- 0.002hrs with an amplitude of 0.28 +/- 0.03mag [2007-12-05 00:12, HuntersHill]

· Observed 2007-11-19 from 12:07UT to 17:45UT in average conditions. Period refined to 12.929 +/- 0.003hrs with an amplitude of 0.33 +/- 0.02mag. No deviations noted in the plot. [2007-11-19 21:16, HuntersHill] Message sent to observers

· Observed 2007-11-15 from 11:27UT to 16:38UT in average conditions. Large gap in data due to dewing up of the corrector plate and data was tossed. Good data did cover the gap and the period remains at 12.92 +/- 0.01 mag [2007-11-15 23:40, HuntersHill] Message sent to observers

· Observed 2007-11-14 from 11:22UT to 18:00UT in reasonable conditions. New data removes alias's and reveals a solid period of 12.92 +/- 0.02hrs with an amplitude of 0.4 +/- 0.02mag. One small portion of the curve has not been covered (approx 2 hrs with overlap). [2007-11-14 21:05, HuntersHill] Message sent to observers

· Observed 2007-11-13 from 11:37UT to 18:02UT in average conditions. Data reveals a sawtooth shaped curve with a period of 12.89 +/- 0.02 hrs with an amplitude of 0.44 +/- 0.02 mag. This is not a unique solution as yet with possible periods at 10.30, 11.39, 15.19 and 17.20 hrs though the 11.39, 15.19 and 17.20 periods would appear unlikely at this stage. [2007-11-13 21:22, HuntersHill] Message sent to observers

· Observed 2007-11-11 from 12:37UT to 18:06UT in reasonable conditions. Data indicates a possible monomdal period ~ 7-7.5hrs with an amplitude of ~ 0.35 +/- 0.02mag. Some lost points due to bad pointing and several more due to a bright field star. [2007-11-11 21:40, HuntersHill] Message sent to BinAstPhotSurvey conference

2007 PU11 (Finished) [Add new note]
· This Amor has been done by Albino Carbognani from Saint Barthelmy Observatory on six nights (Albino, welcome to the BinAstPhotSurvey), by Don from Carbuncle Hill on three nights, and by Stefan from Modra on one night. It is a slow rotator (U=3-),
http://www.asu.cas.cz/~asteroid/2007pu11.png
Finished for the Survey, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Albino, Don and Stefan.

Cheers, Petr [2007-12-09 12:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object is too far south for me now, so someone else may want to pick it up?
Don [2007-12-01 02:51, CarbuncleHill] Message sent to observers

· Data by Stefan from Modra of Oct. 17.0 and by Don from Carbuncle Hill of Oct. 21.3 indicate a probable lower limit on its period of 37 h,
http://www.asu.cas.cz/~asteroid/2007pu11.png

The data for the slow rotator are sufficient for the BinAstPhotSurvey, so no collaboration is requested.

Cheers, Petr [2007-10-22 12:05, Ondrejov] Message sent to observers

· Correction: Started this at ~00:45.
Don [2007-10-21 00:59, CarbuncleHill]

· The asteroid was observed during 9-12 Oct. After preliminary reduction the period is 27.3 h.
Yura [2007-10-17 21:37, Kharkiv] Message sent to observers

· Observed this new target from 19:43 to 03:46 UT on Oct.16/17, 2007. Next strange object :-), period seems
about 26 hours or a little more, amplitude about 1 mag.
Data sent to Petr/Peter.

Stefan [2007-10-17 04:40, Modra] Message sent to BinAstPhotSurvey conference

(8355) 19889 RQ1 (Finished) [Add new note]
· This one has been done by David from Hunters Hill (2 nights), by Don from Carbuncle Hill (2), and by Peter from here (1). Despite a bit noisy data, it is a unique solution, good coverage, no significant deviation seen. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-12-06 11:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 01:40 UT, under slightly hazy conditions.
Don [2007-12-05 01:45, CarbuncleHill] Message sent to observers

· Observed 2007-12-04 from 10:50UT to 15:00UT in average conditions before clouded out (first night in weeks we didn't have rolling thunderstorms and rain). Many periods seem to fit but something in the 5-6hr range is likely. Forecast is not good for more observations. [2007-12-04 22:52, HuntersHill] Message sent to observers

· I started this at 00:05 UT, hopefully to finish it.
Don [2007-12-01 00:08, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Peter K. has taken a good session in moonlight sky conditions on the past night. A current solution (not unique):
http://www.asu.cas.cz/~asteroid/08355.png
One more full night is needed to establish it uniquely (and probably finish it). Peter will not be able to take the needed additional night soon because there will be students programs on our telescope on the next couple nights, so I encourage someone from another station able to work the target with errors of 0.03 mag to help out.

Clear Skies, Petr [2007-11-28 11:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 18:30 UT and planning to observe as long as possible (what my weather allows). Peter K. [2007-11-27 18:45, Ondrejov]

· Observed 2007-11-19 from 11:56UT to 17:24UT in average conditions. Late start due to clearing thunderstorms meant older targets couldn't be covered long enough. Data reveals a period of 5.6 +/- 0.2hrs with an amplitude of 0.5 +/- 0.03mag. [2007-11-19 21:02, HuntersHill] Message sent to BinAstPhotSurvey conference

1453 Fennia (Finished) - Hungaria Binary [Add new note]
· Our CBET on this one has appeared on Saturday. Its text is pasted below for your convenience. I'm going to update web pages accordingly.

Tomorrow I plan to give out an update of the Binary Asteroid Parameters dataset
http://www.asu.cas.cz/~asteroid/binastdata.htm
with seven new binaries that we have discovered during July-November.

Cheers, Petr

(1453) FENNIA
B. D. Warner, Palmer Divide Observatory, Colorado Springs, CO; A. W.
Harris, Space Science Institute; P. Pravec, Ondrejov Observatory; R. D.
Stephens, Goat Mountain Astronomical Research Station, Yucca Valley, CA; D.
Pray, Carbuncle Hill Observatory, Greene, RI; W. Cooney, J. Gross, and D.
Terrell, Sonoita Research Observatory, Sonoita, AZ; S. Gajdos and A. Galad,
Modra Observatory; and Yu. Krugly, Institute of Astronomy of Kharkiv
National University, Main Astronomical Observatory of National Academy of
Science of Ukraine, report that photometric observations made during Nov.
4-23 reveal that minor planet (1453) is a binary system with an orbital
period of 22.99 ± 0.01 hr. The primary shows a period of 4.4121 ±
0.0001 hr, and it has a lightcurve amplitude of 0.18 mag, suggesting a
nearly spheroidal shape. Mutual eclipse/occultation events indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.28 ±
0.02.

(C) Copyright 2007 CBAT
2007 December 1 (CBET 1150) Daniel W. E. Green [2007-12-03 10:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yura has taken two nights Nov. 23.0 and 23.9 from Kharkiv, covered the secondary events. Updated solution:
P_orb = 22.99 ± 0.01 h
P_1 = 4.4121 h (syn-sid diff. ±0.0004 h)
A_1 = 0.18 mag
D_2/D_1 = 0.28 ± 0.02
http://www.asu.cas.cz/~asteroid/01453_all.png
http://www.asu.cas.cz/~asteroid/01453_porb.png
http://www.asu.cas.cz/~asteroid/01453_porb_contacts.png
http://www.asu.cas.cz/~asteroid/01453_p1.png

Cheers, Petr [2007-11-25 10:29, Ondrejov] Message sent to observers

· This was started at 18:30UT in good conditions. Hope to continue up to 3:30UT.
Yura [2007-11-23 01:16, Kharkiv]

· Ephemeris for events:

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-27 6.64 0.250
2007-11-28 5.64 0.250
2007-11-29 4.64 0.250
2007-11-30 3.64 0.250
2007-12- 1 2.64 0.250
2007-12- 2 1.64 0.250
2007-12- 3 0.64 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-27 18.01 0.745
2007-11-28 17.01 0.745
2007-11-29 16.01 0.745
2007-11-30 15.01 0.745
2007-12- 1 14.01 0.745
2007-12- 2 13.01 0.745
2007-12- 3 12.01 0.745

Clear Skies, Petr [2007-11-22 15:12, Ondrejov]

· Two sessions Nov. 18.3 and 19.3 by Walt, John and Dirk from SRO joined in. Updated solution:
P_orb = 23.00 ± 0.01 h
P_1 = 4.4124 h
A_1 = 0.18 mag
D_2/D_1 = 0.28 ± 0.02
http://www.asu.cas.cz/~asteroid/01453_all.png
http://www.asu.cas.cz/~asteroid/01453_porb.png
http://www.asu.cas.cz/~asteroid/01453_porb_contacts.png
http://www.asu.cas.cz/~asteroid/01453_p1.png

Cheers, Petr [2007-11-21 10:34, Ondrejov] Message sent to observers

· Two new sessions by Brian from PDO, solution refined:
P_orb = 23.00 ± 0.01 h
P_1 = 4.4123 h
A_1 = 0.18 mag
D_2/D_1 = 0.28 ± 0.02
http://www.asu.cas.cz/~asteroid/01453_all.png
http://www.asu.cas.cz/~asteroid/01453_porb.png
http://www.asu.cas.cz/~asteroid/01453_porb_contacts.png
http://www.asu.cas.cz/~asteroid/01453_p1.png

Cheers, Petr [2007-11-19 13:55, Ondrejov] Message sent to observers

· We're working this tonight at SRO. Started the run at 02:25 UT.
John G [2007-11-17 02:59, Sonoita]

· New data joined in:
2007-11-12.3 and 14.3 by Don from Carbuncle Hill
2007-11-13.9 by Stefan and Adrian from Modra
2007-11-15.3 by Brian from PDO
The solution has been refined to:
P_orb = 23.00 +/- 0.02 h
P_1 = 4.4126 +/- 0.0003 h
A_1 = 0.18 mag
D_2/D_1 = 0.28 +/- 0.02
http://www.asu.cas.cz/~asteroid/01453_all.png
http://www.asu.cas.cz/~asteroid/01453_porb.png
http://www.asu.cas.cz/~asteroid/01453_porb_contacts.png
http://www.asu.cas.cz/~asteroid/01453_p1.png
The secondary event has been covered about ok, it would be good to cover the primary event a couple more times, as well as phases between the events (on the other side of its orbit than which has been covered so far). But it looks promissing that we can make it before the full moon.

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-16 17.64 0.250
2007-11-17 16.64 0.250
2007-11-18 15.64 0.250
2007-11-19 14.64 0.250
2007-11-20 13.64 0.250
2007-11-21 12.64 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-17 5.01 0.745
2007-11-18 4.01 0.745
2007-11-19 3.01 0.745
2007-11-20 2.01 0.745
2007-11-21 1.01 0.745

Cheers, Petr [2007-11-16 10:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· I've tried sending data from a run last night to Petr three different times under different account. I've received no reply to the first two and a "you're not on my white-list" to the third, and so don't know if the messages are getting through. There's no point in using the link on this page since that just invokes my email program.

Can someone at Ondrejov please look into why my email address has become black-listed? Thanks. [2007-11-15 17:29, PalmerDivide] Message sent to observers

· Working this tonight starting around 0100-0200 UT. [2007-11-14 22:14, PalmerDivide]

· Started this at 03:50UT.
Don [2007-11-14 03:51, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Under worsening conditions we observed shortly near predicted 0.25 orbital phase. We are afraid of noisy data. Stefan and Adrian [2007-11-14 01:10, Modra] Message sent to observers

· Observing this tonight, presuming clouds stay away as predicted. Will start about 0600 UT. [2007-11-12 23:44, PalmerDivide]

· Two nights Nov. 10 and 11 by Bob Stephens from GMARS, one night of Nov. 11.3 and one new night by Brian from PDO have resolved the orbital period:
P_orb = 23.05 h (uncertainty about 0.1 h)
P_1 = 4.4127 +/- 0.0003 h
A_1 = 0.19 mag
D_2/D_1 = 0.28 +/- 0.03
http://www.asu.cas.cz/~asteroid/01453_all.png
http://www.asu.cas.cz/~asteroid/01453_porb.png
http://www.asu.cas.cz/~asteroid/01453_porb_contacts.png
http://www.asu.cas.cz/~asteroid/01453_p1.png
A possible weak P_2 suggested by the first few sessions has not been confirmed with the new data, we suspect it might be caused by small residual effects of faint background stars in the first few sessions. At this moment, a rotation of the secondary is unconstrained.

Congratulations, Brian, for your new Hungaria binary.

Guys, before announcing this one on a circular, a few more events (and completing coverage outside events) are needed to nail down the solution. The 0.25-phase event (looks to be a primary event) requires one or two good coverages, and the 0.75-phase event (likely secondary) needs at least one good coverage to see whether it has an entirely flat bottom. Only good data with errors not greater than 0.02 mag are likely to be useful for the binary now, so don't bother in poorer conditions or where there are serious star interferences around event time. Ephemeris for both events is below, but take some data also outside events to complete coverage there.

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-12 22.23 0.265
2007-11-13 21.28 0.265
2007-11-14 20.33 0.265
2007-11-15 19.38 0.265
2007-11-16 18.43 0.265
2007-11-17 17.48 0.265
2007-11-18 16.53 0.265
2007-11-19 15.58 0.265

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-13 9.19 0.740
2007-11-14 8.24 0.740
2007-11-15 7.29 0.740
2007-11-16 6.34 0.740
2007-11-17 5.39 0.740
2007-11-18 4.44 0.740
2007-11-19 3.49 0.740

Cheers, Petr [2007-11-12 10:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this at around 04:00 UT.
Don [2007-11-11 23:47, CarbuncleHill]

· Also working this tonight. If Don and Bob were successful, we'll have an extended run with overlapping coverage that will confirm any features. [2007-11-11 06:42, PalmerDivide] Message sent to observers

· I'll be doing this after 2501, and should get about a six hour run.
Don [2007-11-10 23:04, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Obtained about 10 hours of data from GMARS and detected an apparent event. Data sent to Petr. Wind permitting, will get another run in tonight. Bob Stephens [2007-11-10 20:45, Santana] Message sent to observers

· I have just updated the analysis with Brian's data of the past night. P_1 refined, a solution for P_2 improving (but more high quality data still needed to establish it well). For P_orb, the possible solutions 23.0 and 46 h still hold, but we need to capture more events. (A couple last points in your recent session dropped, but it will be probably good to take the before-end-of-session feature with care unless you are sure the last couple points are good.)
http://www.asu.cas.cz/~asteroid/01453_p1.png
http://www.asu.cas.cz/~asteroid/01453_p2.png
http://www.asu.cas.cz/~asteroid/01453_p2_nsp.png
http://www.asu.cas.cz/~asteroid/01453_porb.png

Data at any time are needed to capture more events and establish P_orb.

Cheers, Petr [2007-11-09 16:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· 1453 Fennia looks to be a strong binary candidate. It is moving through crowded fields, so be careful. Petr's analysis of the initial data follows.

Indeed, it is a serious binary candidate. P_1 = 4.412 h is firmly established. P_2 is weak, but it may be 7.12 h (assuming bimodal shape), but it is not unique at all. The attenuation in the 1st session is well established, and if also the end of attenuation captured in the
beginning of the 2nd session is ok, then P_orb may be 23.0 or 46 h, i.e., nearly commenusurate with 1 day.

http://www.asu.cas.cz/~asteroid/01453_p1.png
http://www.asu.cas.cz/~asteroid/01453_porb.png [2007-11-09 16:14, PalmerDivide] Message sent to BinAstPhotSurvey conference

(32039) 2000J023 (Finished) - Binary or ternary, nailing down the estimated P_orb = 360 h with more data needed [Add new note]
· Our announcement has appeared on CBET 1147, copied below for your convenience. I'm going to update the web pages accordingly.

Cheers, Petr

(32039) 2000 JO23
D. Pray, Carbuncle Hill Observatory, Greene, RI; P. Pravec, P. Kusnirak
and K. Hornoch, Ondrejov Observatory; D. Higgins, Canberra, Australia; W.
Cooney, J. Gross, and D. Terrell, Sonoita Research Observatory, Sonoita,
AZ; J. Oey, Leura, N.S.W., Australia; A. Galad, L. Kornos, S. Gajdos, and J.
Vilagi, Modra Observatory; R. Stephens, Goat Mountain Astronomical Research
Station, Yucca Valley, CA; F. Marchis and M. Baek, SETI Institute; B.
Macomber, University of California at Berkeley; V. Reddy, Department of
Earth System Science and Policy, University of North Dakota, Grand Forks;
and M. Husarik and M. Pikler, Skalnate Pleso Observatory, report that
photometric observations obtained during Sept. 3-Nov. 8 reveal that minor
planet (32039) is a binary system. Mutual events observed on Sept. 16.3,
Oct. 1.3, and 8.8 suggest an orbital period of 360 hr, and their depth of
0.32 mag indicates a lower limit on the secondary-to-primary mean-diameter
ratio of 0.58. Two additive lightcurve components have been observed, one
with a period of 3.2990 ± 0.0002 or 6.5979 ± 0.0009 hr and amplitude
0.05 mag, and the other one with a period of 11.099 ± 0.003 hr and
amplitude 0.08 mag. The former appears to be a rotation lightcurve of the
primary, but an interpretation of the latter lightcurve component as
belonging to the secondary is less certain and model-dependent. Calibrated
data give an estimated mean absolute magnitude H_R = 15.39 and slope
parameter G = 0.25, both with formal uncertainties of 0.03.

2007 November 23 (CBET 1147) Daniel W. E. Green [2007-11-24 11:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don and Michal&Marek have taken four more session for this one, but unfurtunately all were outside events. The asteroid is still bright enough for some of us to get data with errors not greater than 0.05 mag for its exteremly long orbital period, so I encourage you who can work it to do so on Nov. 14 and 15; there is predicted an event for Nov. 15, about 8 UT, but the prediction is fairly uncretain given that we have last seen the event on Oct. 1.

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-15 7.7 0.241

Clear Skies, Petr [2007-11-09 11:51, Ondrejov] Message sent to observers

· Doing another run in search of the elusive "big drop". I saw nothing last night.
Don [2007-11-08 02:43, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this several hours before the approximate predicted event time. Taking an exposure every 20-24 min.
Don [2007-11-07 01:20, CarbuncleHill]

· Observing from 18:00 UT in good conditions. Michal [2007-11-01 18:15, SkalnatePleso] [Remove]
Message sent to observers

· This long-P_orb one will be already pretty faint after the full moon, but some of us could be still able to observe it with errors not greater than 0.05 mag. As no more events have been covered since Oct. 8 and the period estimate of 360 h has not been nailed down, predicted times of next events are necessarily somewhat tentative and uncertain (perhaps even up to 1 day). If you liked, however, to invest your telescope time to observing the extraordinary object, you may try to capture it on nights around the times predicted below. Observations well away from the predicted times will be less likely to bring new information, but wouldn't be worthless as well if you have a free time.

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-31 7.7 0.241

Date/Time UTC (LTc.) Phase
--------------------------
2007-11- 7 19.9 0.742

Clear Skies, Petr [2007-10-23 08:41, Ondrejov] Message sent to observers

· Observing from 18 UT and should get 6-hours long run. Peter K. [2007-10-17 01:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-16 from 09:38UT to 14:58UT in fair conditions. Noisy data at the error limit. [2007-10-17 01:25, HuntersHill] Message sent to observers

· Observed 2007-10-16 from 09:38UT to 14:58UT in fair conditions. Noisy data at the error limit. [2007-10-16 22:55, HuntersHill]

· Observing from 18 UT and should get 6-hours long run. Peter K. [2007-10-16 18:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data for the long-P_orb binary joined in:
2007-10-09.3 by Franck Marchis, Brent Macomber, M. Baek, and Vishnu Reddy from Lick
2007-10-13.1 and 15.1 by Don from Carbuncle Hill
2007-10-13.5, 14.5, and 15.5 by David from Hunters Hill
2007-10-13.8 by Peter and Kamil from here
2007-10-14.6 by Julian from Leura.
The new data are consistent with the proposed 360-h orbital period, see
http://www.asu.cas.cz/~asteroid/32039_porb_07oct.png
We will see what more data taken in the rest of this lunation will show, but we will probably have to take more data in the next lunation if we wanted to really nail down the P_orb solution. Well, it is a really time consuming object for its extremely long P_orb ....

Clear Skies, Petr [2007-10-16 16:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-15 from 09:27UT to 15:14UT in poor conditions. No significant deviations detected. [2007-10-15 22:27, HuntersHill] Message sent to observers

· observed from 12:20 UT to 15:34 UT 2007-10-14 . [2007-10-15 02:52, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started at 23:55, Oct 14,UT.
Don [2007-10-15 00:38, CarbuncleHill]

· Observed 2007-10-14 from 09:43UT to 15:16UT in poor conditions. Just within max error and no significant deviations noted. [2007-10-14 22:31, HuntersHill] Message sent to observers

· Observed 2007-10-13 from 09:08UT to 15:25UT in reasonable conditions. Right on the edge of acceptable error margin but no significant deviation detected. Data sent to Petr. [2007-10-14 02:36, HuntersHill]

· Observing from 17:55 UT. We are planning to cover one full rotation (3.5 h). Peter K. + Kamil [2007-10-13 18:36, Ondrejov] Message sent to observers

· Two good (though only 3.6-3.8 h long, limited by clouds) sessions by Peter and Kamil from here and by Leos from Modra of Oct. 8.8 and 8.9 have captured an event:
http://www.asu.cas.cz/~asteroid/32039_porb_x.png
Actually, both sessions were taken fully (with a possible exception of a couple points) inside the event, so they cannot be linked with the whole dataset using overlaps of points outside the event, but a regular photometric linkage will do it when we get a photometric sky.

We cannot tell yet whether the October 8.8 event is the same event as the possible one of Sept. 24.2 by Don - there may occur double events, or the 360h period solution may be slightly off. It will be solved with more data.

Cheers, Petr [2007-10-09 11:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· There is one additional dataset that, if correct, suggests that an event may occur tomorrow Oct. 9, 8 UT: A session by Don of Sept. 24.2 has shown a few very decreased points before its end, but they coincided with very worsened conditions,
http://www.asu.cas.cz/~asteroid/32039_porb_x.png
We are not sure whether the drop is real or due to the bad conditions, but definitely observing the system tomorrow should be extremely useful.

Clear Skies, Petr [2007-10-08 14:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data by Bob Stephens from GMARS and by Walt, John and Dirk from SRO taken on Oct. 7.2 rule out the 141h candidate orbital period. So, the whole dataset indicate P_orb = 360 h (+/- a few hours).
http://www.asu.cas.cz/~asteroid/32039_p1.png
http://www.asu.cas.cz/~asteroid/32039_p2.png
http://www.asu.cas.cz/~asteroid/32039_porb.png

The very long orbital period needs to be nailed down with more data. Only one event can be predicted: October 16, 8 UT. Other event(s) may occur in gaps in coverage of the orbital period (see the plot above). It would be worthwhile to cover the gaps so that other event(s) may be captured. Relevant phases will occur during following times:

2007 Oct. 8, 8 UT - Oct. 13, 21 UT (phases 0.71-0.08)
2007 Oct. 14, 11 UT - Oct. 15, 9 UT (phases 0.12-0.18)
2007 Oct. 16, around 8 UT (event, phase 0.24)
2007 Oct. 16, around 17.5 UT (phase 0.269)
2007 Oct. 17, 7 - 19 UT (phases 0.31-0.34)
2007 Oct. 17, around 23 UT (phase 0.351)
2007 Oct. 18, around 9 UT (phase 0.378)
2007 Oct. 18, 17 UT - Oct. 19, 1 UT (phases 0.40-0.42)
2007 Oct. 19, 9 UT - Oct. 20, 2 UT (phases 0.44-0.49)

So, as you can see, an almost continuous coverage would be needed. It of course is principally because to cover the 360h orbital period, a total time interval of observations needs to be on the same order. It is very time expensive, but would be very useful for the extraordinary system. Please give it a high priority; unless you have other urgent target for a given night, observing 32039 is the best program.

Clear Skies, Petr [2007-10-08 10:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started imaging at 4:00 UT at GMARS.
Bob Stephens [2007-10-07 05:22, Santana] Message sent to observers

· We started this at 2:00 UT. John G [2007-10-07 03:48, Sonoita]

· A good session taken by Walt, John and Dirk from SRO on October 4.3 joined in. Fits well with the two short periods, no event captured, consistent with both 141 h and 360 h candidate orbital periods.
http://www.asu.cas.cz/~asteroid/32039_p1.png
http://www.asu.cas.cz/~asteroid/32039_p2.png
http://www.asu.cas.cz/~asteroid/32039_porb.png

Hopefully we will have a better luck with weather for next predicted events.

Clear Skies, Petr [2007-10-05 09:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· We started this at 2:10 from SRO. John G [2007-10-04 02:13, Sonoita] Message sent to observers

· So, Don and Julian have captured another deep event centered 2007 October 1, 8 UT. Its duration is 5.5 h. They didn't cover a central part of the event, a lower limit on its depth is 0.3 mag.
Other useful data added recently:
2007-09-29.0 and 30.9 by Jozef and Stefan from Modra
2007-09-29.4 and 30.5 by Julian from Leura.

The whole dataset gives two possible values for P_orb: 141 or 360 hours. To resolve between them, we need to cover more events (prediction below). Given the duration of the events and an uncertainty of the prediction (which varies between <1 hour to a few hours for individual events), observations during a pretty wide interval (at least several hours before/after) around the predicted times will be needed.
http://www.asu.cas.cz/~asteroid/32039_p1.png
http://www.asu.cas.cz/~asteroid/32039_p2.png
http://www.asu.cas.cz/~asteroid/32039_porb.png

Predicted events for P_orb = 141 h:

Date/Time UTC (LTc.) Phase
--------------------------
2007-10- 3 23.3 0.241 probably decisive
2007-10- 9 20.3 0.241 useful, but ambiguity may remain
2007-10-15 17.3 0.241 decisive
2007-10-21 14.3 0.241 decisive

Date/Time UTC (LTc.) Phase
--------------------------
2007-10- 7 5.0 0.792 useful, but ambiguity may remain
2007-10-13 2.0 0.792 probably decisive
2007-10-18 23.0 0.792 probably decisive

For P_orb = 360 h, only one event can be predicted with a reasonable precission:

Date/Time UTC (LTc.)
--------------------
2007-10-16 8.0

Cheers, Petr [2007-10-02 09:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 09:20UT to 16:21 UT 2009-10-01. Interesting light curve with deep event caught in the first 2 hours. Amplitude >0.3m ( could be more due to back ground star interference.) Don, you may have caught the beginning.. [2007-10-02 02:19, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observed from 08:55UT and finished at 11:27UT 2009-09-29, followed the next day with 08:57UT to 15:57UT 2009-09-30 in good condition. data sent in. [2007-10-01 05:07, Blue Mountains Obs]

· Started this at 00:00, Oct 1 UT.
Don [2007-10-01 03:45, CarbuncleHill] Message sent to observers

· we plan to cover this one tonight, starting 18:00, till 0:40 UT, weather seems favourable. jozef, stefan [2007-09-30 18:17, Modra]

· Of course, there is also another, somewhat "crazy" (but not quite) solution for the observed lightcurves: The 11.097h-period component that is nearly constant outside its minima maybe an eclipse lightcurve of a small satellite (size ratio 0.2); see following picture where durations and shapes (e.g., flat bottom of the second minimum) of the minima are shown to be consistent with the small close satellite solution:
http://www.asu.cas.cz/~asteroid/32039_p1_contacts.png

If it is a true solution, then the deep event captured by Don on Sept. 16.2 would be due to another, much larger and more distant satellite. We will see if more data in future will constrain the possible solution; high accuracy data with errors of 0.01 mag will be needed to study if the shallow minima of the 11.097h component are due to the suspected small close satellite.

Cheers, Petr [2007-09-24 11:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2007-09-19.2 and 21.2 by Don from Carbuncle Hill
2007-09-20.3 by Walt, John and Dirk from SRO
2007-09-20.6, 21.6 and 22.5 by David from Hunters Hill
2007-09-20.9 and 21.9 by Adrian from Modra
2007-09-21.5 and 22.6 by Julian from Leura.
The two periods are:
11.097 +/- 0.001 h (a half period is less likely due to apparent differences in shapes of minima of the lightcurve component), amplitude 0.08 mag;
3.2983 +/- 0.0006 h (monomodal) or 6.597 +/- 0.001 h (bimodal), amplitude 0.04 mag.
http://www.asu.cas.cz/~asteroid/32039_p1.png
http://www.asu.cas.cz/~asteroid/32039_p2.png
http://www.asu.cas.cz/~asteroid/32039_p2_nsp.png
We cannot tell from the available data what the two periods belong to.
No more deep event captured so far. In following picture, I have plotted the data taken from Sept. 16 to 22 that cover the nearly 7-day long interval fairly frequently:
http://www.asu.cas.cz/~asteroid/32039_070916_22.png
The Don's session of Sept. 16.2 with the deep event is on the left side. An only other deviation from the two-periodic solution is in session Sept. 17.2 by Don, but it is much more shallow and short (duration <1 h; see the decreased points about phase 0.76 in the first plot for the 11.097h period above); if it is an event, it must be another, short partial one. We cannot constrain a period of the deep event much; it is certainly longer than 2 days, and probably longer than 4 days.

The two lightcurve periods have been established as best as we could (despite the remaining ambiguity), and though their interpretation remains uncertain, more data for them are not needed now. Attempting to capture more events -observations with gaps of 0.5h would be still OK for the purpose, so the target may be conveniently worked together with another one- would be still worthwhile after the Moon is away. Good luck with more observations of the tough binary.

Cheers, Petr [2007-09-24 10:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-21 from 09:16UT to 16:49UT is fair conditions. One bright star subtraction. Data sent to Petr. [2007-09-23 01:55, HuntersHill]

· Observed from 11:12UT to 17:13UT 2007-09-22 in good condition. [2007-09-23 00:28, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I only manage a short 3 hours run last night. 09:54 to 12:44UT 2007-09-21 [2007-09-22 02:37, Blue Mountains Obs]

· Observed 2007-09-21 from 10:00UT to 16:50UT in good conditions. Data sent to Petr. [2007-09-22 01:41, HuntersHill] Message sent to BinAstPhotSurvey conference

· I'll be extending Adrian's run on this tonight. Fog is forecast later, unfortunately, so I don't know how much data I'll get.
Don [2007-09-21 23:56, CarbuncleHill]

· It seems we had a quite long nearly continuous session yesterday thanks to "baton pass" from David through me to Don. :-) Tonight it will be with some of my interruptions but we run further not to miss the attenuation. Adrian [2007-09-21 20:05, Modra] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-20 from 10:52UT to 16:51UT in good conditions after a rain front passed through. I dropped 7870 to increase density of coverage for this target. Data sent to Petr. [2007-09-21 01:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Starting at 00:15 UT.
Don [2007-09-20 23:57, CarbuncleHill]

· My observing time after many nights - I'll try to study this. Adrian [2007-09-20 18:48, Modra] Message sent to BinAstPhotSurvey conference

· A good session by David from Hunters Hill of 2007-09-18.6 joined in.
I have looked in a bit more detail at the solution for P_1. It is actually possible that the period is twice 5.55 h, i.e., 11.10 h. Critical for resolving it will be more good long data with errors <=0.02 mag that will reveal shapes of the lightcurve around its maxima.
A solution for P_2 is still weak, but 6.60 h holds with new data. Hopefully we will resolve it with more data too.
Cannot tell yet which of the two periods belongs to primary and which belongs to secondary. We will see whether more data will allow us to resolve it.
It is important to observe the asteroid from a range of longitudes, both to nail down the periods and to capture more events.
http://www.asu.cas.cz/~asteroid/32039_p1.png
http://www.asu.cas.cz/~asteroid/32039_p2.png
http://www.asu.cas.cz/~asteroid/32039_p2_nsp.png

Cheers, Petr [2007-09-19 08:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:30 UT in excellent conditions, but with possible fog later.
Don [2007-09-19 00:33, CarbuncleHill]

· Observed 2007-09-18 from 10:42UT to 17:01UT in good conditions. Telescope had pointing problems which left holes in the data coverage but data appears to be just inside the 0.02mag error margin required. [2007-09-18 23:47, HuntersHill] Message sent to BinAstPhotSurvey conference

· More data joined in:
2007-09-16.0 by Peter K. from here
2007-09-17.2 and 18.2 by Don from Carbuncle Hill.
P_1 is being nailed down as new data come (5.550 h). A solution for P_2 is improving as well, it looks likely to be 6.60 h. See
http://www.asu.cas.cz/~asteroid/32039_p1.png
http://www.asu.cas.cz/~asteroid/32039_p2.png
http://www.asu.cas.cz/~asteroid/32039_p2_nsp.png

Those periods are unusual in themselves, but may be ok for a relatively wide system with large D_2/D_1. Assuming that the single deep event captured is a secondary event, a lower limit on D_2/D_1 is 0.6. And the fact that the captured event has a relatively long decreasing branch suggests that orbital period is relatively long too. So, it may take some effort (and luck) to capture more events, but it is definitely worthwhile to do it. For now, Don and others who can contribute, keep taking data with a reasonably dense sampling so that the two periods can be estimated well. After they are established, the strategy may be changed as for capturing more events, a very dense sampling is not necessary; gaps as long as 0.5 hour would be ok, so this target might be worked together with another target then.

Cheers, Petr [2007-09-18 17:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:30 UT.
Don [2007-09-18 03:09, CarbuncleHill]

· Observing from 18:45 UT but awaiting clouds within 3 hours or so. Peter K. [2007-09-17 18:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don has worked this one on 7 nights since September 3. Data from the first six sessions didn't fit well with a single period, so there occured a suspicion that there may be a second period present, but a good soluion was not possible from the limited data. Finally, Don's seventh night of Sept. 16.2 has revealed what appears to be a ~0.37mag-deep event. Peter Kusnirak has supported him with a high quality 7.3h-long session from here on the past night.
http://www.asu.cas.cz/~asteroid/32039.png
A possible main period is 5.55 h, but more good long sessions with errors not greater than 0.02 mag and taken from stations on different continents are needed to really establish it. And, of course, we need to capture more events to establish P_orb.

Clear Skies, Petr [2007-09-17 12:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 00:45, Sep 17 UT, and will extend Peter's run.
Don [2007-09-17 02:10, CarbuncleHill]

· Tonight's run on this one I started at 18:50 UT a should be able to observe to 2 UT. 32039 will be my main (and only one) target as 10208 is passing close to a background star tonight. Sky conditions are excellent. Peter K. [2007-09-16 18:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 22:30 UT to 2:15 UT (Sep 15/16). Peter K. [2007-09-16 01:58, Ondrejov]

· I'll starting this at 00:40 UT.
Don [2007-09-16 00:27, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 00:45 UT.
Don [2007-09-14 00:58, CarbuncleHill]

· Don,

Yes, 13.5h is a possible solution, but more full night sessions with errors not greater than 0.02 mag are needed to really to establish it.

This target would benefit from a collaboration with a station on another continent, but I am affraid that it will have to wait until after the new binaries are completed .... Anyway, if someone in Europe and/or Australia was looking for a target to help with, this one is an obvious choice.

Clear skies, Petr [2007-09-10 08:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began a run on this at 01:20 UT.
Don [2007-09-08 02:07, CarbuncleHill]

· Starting this one tonight at 03:15 UT.
Don [2007-08-15 02:56, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(7281) 1988 RX4 (Finished) [Add new note]
· David has worked it on five nights, showed a period around 16.7 h (U=2). It has been done sufficiently for the BinAstPhotSurvey, so we are closing it, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-11-23 10:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-11-15 from 09:53UT to 13:31 in average conditions. Session cut short due to dewing over so not sure just how reliable the data will be (I had to delete 3 hrs worth of images as it was). Period of 16.6 or 16.8hrs both fit equally well. [2007-11-15 17:05, HuntersHill] Message sent to observers

· Observed 2007-10-19 from 10:26UT to 18:00UT in poor conditions (cloud started moving in 1/2 way through). New possible period 16.7 +/- 0.2 hrs with an amplitude a little over 0.1mag +/- 0.03mag [2007-10-20 03:34, HuntersHill] Message sent to observers

· Observed 2007-10-18 from 10:38UT to 13:42UT in good conditions until closed by a wind storm. Data now reveals a period in the vicinity of 25-26hrs with an amplitude 0.1 +/- 0.03 based on a reasonable monomodal curve fit at 13.1 +/- 0.2hrs. [2007-10-18 22:47, HuntersHill] Message sent to observers

· Observed 2007-10-17 from 10:49UT to 15:08UT in good conditions until session terminated by a rogue cloud.... No period could be resolved as yet. [2007-10-17 23:17, HuntersHill]

· Observed 2007-10-16 from 11:57UT to 18:15UT in fair conditions. Data shows a low amplitude general increase in brightness over the entire session - possibly a peak. Total amplitude 0.1 +/- 0.02 mag [2007-10-16 22:30, HuntersHill] Message sent to BinAstPhotSurvey conference

(7870) 1987 UP2 (Finished) - period not established well enough (U=2-) [Add new note]
· See
http://www.asu.cas.cz/~asteroid/07870.png
It is not sufficient to be included into the BinAstPhotSurvey sample. [2007-11-20 14:37, Ondrejov]

· I started this at 00:01 Oct 15 UT.
Don [2007-10-15 00:42, CarbuncleHill] Message sent to observers

· Started at 00:00, Oct 14 UT.
Don [2007-10-14 00:07, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 20:10 UT in good conditions, plan to take few hours run. Stopped 21:15 UT due to unsuitable wx cond. Michal [2007-10-06 21:18, SkalnatePleso] [Remove]
Message sent to observers

· Observed 2007-10-04 from 09:01UT to 14:44UT in reasonable conditions. Data fits well with Petr's defined period. [2007-10-04 23:44, HuntersHill]

· We started a run on this around 02:46 UT.
John G [2007-09-30 03:22, Sonoita] Message sent to observers

· Worked this from about 0215-0415. I had to shut down due to high winds and poor seeing. [2007-09-22 07:22, PalmerDivide] Message sent to BinAstPhotSurvey conference

· I'll be starting this at around 00:15 UT.
Don [2007-09-22 00:00, CarbuncleHill]

· Session started at 19:25 UT in a relatively good conditions at the moment. Plan to run it as long as possible acc. wx forecast. Expecting to take 4-5 hours. Michal [2007-09-21 19:31, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· I worked this early Sept 20 UT. I found a low amplitude curve, 0.07 mag, with a period around 10 hours (assuming bimodal). I've sent my data to David to merge with his. I could be latching onto minor oscillations in a much longer period curve, too. [2007-09-21 04:05, PalmerDivide] Message sent to BinAstPhotSurvey conference

· I started this at 00:10 UT.
Don [2007-09-21 00:08, CarbuncleHill]

· The winds subsided and I'm working this. Getting about 50 SNR, or about 0.02 mag precision. [2007-09-20 02:50, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Assuming the winds die down a little, I'll work this tonight (Sept 19-20). [2007-09-20 00:14, PalmerDivide]

· David's data for this one of Aug. 3, 6, and particularly the new good quality long session of Sept. 18 suggest a longish period, but obviously no real solution yet. It would benefit from having good long data from another continent, especially since the period may be close to 12 hours; see following plot where the data are folded with one of a number of possible periods:
http://www.asu.cas.cz/~asteroid/07870.png
I encourage you observers in Europe or America to help David with this one, on a night when you are not busy with the new binaries (e.g., because others cover them on the night) or with your other targets.

Clear Skies, Petr [2007-09-19 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-18 from 08:45UT to 16:24UT in good conditions. Had some pointing problems so some gaps in the data. No good solution is presenting itself as yet. [2007-09-18 23:59, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-06 from 11:29UT to 16:42UT in good conditions until ended by heavy fog. Target still exhibits apparently low amplitude and relatively noisy data. Best fits, depending on how the sessions are aligned are 6hr and 11hrs though there are a considerable number of other possibilities. [2007-08-07 00:33, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-03 from 11:53UT to 15:58UT in varying conditions cut short by wind and cloud. Target appears a little fainter than expected. Lightcurve showed little variation other than a very slight but steady decline over the duration of the session, an 0.08 +/- 0.03 magnitude amplitude over 4 hrs. [2007-08-04 03:03, HuntersHill] Message sent to BinAstPhotSurvey conference

(16635) 1993QO (Finished) - Binary [Add new note]
· Our announcement has appeared on CBET 1143, I'm copying its text below for your convenience. Web pages will be updated shortly.

Cheers, Petr

(16635) 1993 QO
D. Pray, Carbuncle Hill Observatory, Greene, RI; P. Pravec, P. Kusnirak,
and K. Hornoch, Ondrejov Observatory; Yu. Krugly and V. Chiorny, Institute
of Astronomy, Kharkiv National University, National Academy of Science of
Ukraine; M. Husarik and M. Pikler, Skalnate Pleso Observatory; J. Vilagi, S.
Gajdos, and A. Galad, Modra Observatory; W. Cooney, J. Gross, and D. Terrell,
Sonoita Research Observatory, Sonoita, AZ; N. Gaftonyuk, Simeiz Observatory;
R. Stephens, Goat Mountain Astronomical Research Station, Yucca Valley, CA;
R. Durkee, Minneapolis, MN; F. Marchis and M. Baek, SETI Institute; B.
Macomber, University of California at Berkeley; V. Reddy, Department of Earth
System Science and Policy, University of North Dakota, Grand Forks; F. Colas
and J. Lecacheux, IMCCE and Pic du Midi Observatory; and J. Ries, McDonald
Observatory, report that photometric observations obtained during Sept. 2-
Nov. 9 reveal that minor planet (16635) is a binary system with an orbital
period of 32.25 ± 0.03 hr. Additive rotation lightcurves of system's
components have periods 2.2083 ± 0.0002 and 7.622 ± 0.002 hr and
amplitudes 0.17 and 0.05 mag, respectively. Mutual events indicate a lower
limit on the secondary-to-primary mean-diameter ratio of 0.27. Calibrated
data give an estimated mean absolute magnitude H_R = 14.0 ± 0.3, assuming G
= 0.15 ± 0.2.

(C) Copyright 2007 CBAT
2007 November 19 (CBET 1143) Daniel W. E. Green [2007-11-19 12:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· New observations by Judit and Don suggest that the system is moving away from the event's geometry. More observations before Nov. 19 from stations that can work it with errors not greater than 0.02 mag (probably only Francois, Judit, and Nelya with 1m or larger telescopes) would be still useful to show whether the events don't disappear completely; ephemeris below. We will announce the binary after the campaign is over.

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-13 2.94 0.250
2007-11-14 11.19 0.250
2007-11-15 19.44 0.250
2007-11-17 3.69 0.250
2007-11-18 11.94 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007-11-13 19.40 0.760
2007-11-15 3.65 0.760
2007-11-16 11.90 0.760
2007-11-17 20.15 0.760

Cheers, Petr [2007-11-12 11:43, Ondrejov]

· I observed it from 18 to 21:20 UT. Nelya. [2007-11-10 00:34, Simeiz] Message sent to observers

· I have started at 1:30 UT Nov 9, and hope to catch most of the 0.251 event, and more. The weather looks good.

Judit [2007-11-09 01:54, McDonald Observatory]

· Doing this to catch the 0.752 event at 1.86ut. Hopefully data will be within acceptable tolerance.
Don [2007-11-07 01:22, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Here is an ephemeris for events in this binary (probably only Francois with the 1m telescope can take data with errors of 0.02 mag needed for it now):

Date/Time UTC (LTc.) Phase
--------------------------
2007-11- 2 8.97 0.251
2007-11- 3 17.22 0.251
2007-11- 5 1.47 0.251
2007-11- 6 9.72 0.251
2007-11- 7 17.97 0.251
2007-11- 9 2.22 0.251
2007-11-10 10.47 0.251
2007-11-11 18.72 0.251

Date/Time UTC (LTc.) Phase
--------------------------
2007-11- 1 16.86 0.752
2007-11- 3 1.11 0.752
2007-11- 4 9.36 0.752
2007-11- 5 17.61 0.752
2007-11- 7 1.86 0.752
2007-11- 8 10.11 0.752
2007-11- 9 18.36 0.752
2007-11-11 2.61 0.752

Clear Skies, Petr [2007-11-01 14:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Francois Colas and Jean Lecacheux have covered the 0.25-phase event well from Pic du Midi on 2007-10-20.0:
http://www.asu.cas.cz/~asteroid/16635_p2_porb_b.png
The data show a more evolution of the event, but not sure how far from central geometry we are now.

Calibrated data by Peter&Kamil from here of 2007-10-05.8 indicate H_R = 14.0 +/- 0.25 (assuming G= 0.15 +/- 0.2). So, the asteroid will be R~16.4 (V~16.8) after the full moon. Is there someone with a telescope time available able to take data with errors not higher than 0.02 mag after the full moon?

Petr [2007-10-22 09:59, Ondrejov] Message sent to observers

· Short session started at 21:50 UT in underaverage conditions with no prediction. Michal [2007-10-19 21:54, SkalnatePleso] [Remove]

· Yura has observed it on the same night as Michal and Marek, effectively prolonging their session, covered the 0.75-phase event. It is there and pretty deep, though apparently not quite central yet. We will see what will more data show on further evolution of both events.
http://www.asu.cas.cz/~asteroid/16635_p2_porb_b.png

Clear Skies, Petr [2007-10-19 09:13, Ondrejov] Message sent to observers

· Observations by Michal and Marek from Skalnate Pleso on Oct. 17.8 have been terminated by incoming cold front just before the event,
http://www.asu.cas.cz/~asteroid/16635_p2_porb_b.png

Petr [2007-10-18 13:18, Ondrejov] Message sent to observers

· Observing from 17:00 UT in good conditions. Michal [2007-10-17 17:33, SkalnatePleso] [Remove]

· Walt has checked the SRO data of Oct. 15.2 that showed the strange behaviour, and he has found that there was a nearby offending star that contaminated asteroid aperture. It affected data in the whole event, so the apparent strange behaviour -"non event" of Oct. 15.2 while there was a normal event in the Oct. 15.9 data from Skalnate Pleso- was actually an artifact. See
http://www.asu.cas.cz/~asteroid/16635_p2_porb_b.png
where I left for now for comparison also the originally reduced data of Oct. 15.2 (with the artifact at times of the expected event). An analysis of available data with the revised SRO dataset of Oct. 15.2 shows a reasonably behaving binary, with events evolving towards deeper ones recently. So, there is still a reasonable chance that more data for events during following nights at more central geometry will bring a good estimate for D_2/D_1 for the interesting binary. Those of us who can work it with errors not greater than 0.02 mag, please try to take more data for events during the next few nights before Moon interferres too much.

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-18 14.19 0.250
2007-10-19 22.44 0.250
2007-10-21 6.69 0.250
2007-10-22 14.94 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-17 22.21 0.755
2007-10-19 6.46 0.755
2007-10-20 14.71 0.755
2007-10-21 22.96 0.755

Cheers, Petr [2007-10-17 09:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Additional data joined in:
2007-10-05.2 and 15.2 by Walt, John and Dirk from SRO
2007-10-06.0 by Don from Carbuncle Hill
2007-10-09.3 by Franck Marchis, Brent Macomber, M. Baek, and Vishnu Reddy from Lick
2007-10-15.9 by Michal and Marek from S. Pleso.
A behaviour of the binary seen in the recent data is really strange: while the 0.25-phase event still occurs on Oct. 15.9, the 0.75-phase event is not seen in the SRO data of Oct. 15.2,
http://www.asu.cas.cz/~asteroid/16635_p2_porb_b.png

Clearly, there is something unusual in the binary. I'm not sure, however, if more observations of the fading target well past opposition and in a somewhat denser than usual star field would bring a resolution of the complex case. Anyway, if someone likes to work it with errors <0.03 mag on a free night, it could be still worthwhile to take more data with a hope that they could bring a new key information to resolve the case. Next events will occur at times given below, but considering the complex behaviour, data at any time might be useful. Please work it if you feel like investing a telescope time to something strange but difficult. After this lunation is over for the target (in about one week), I will give it another carefull look to see if I can find what it is there in the asteroid finally.

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-17 5.85 0.247

Date/Time UTC (LTc.) Phase
--------------------------
2007-10-17 22.21 0.755

Clear Skies, Petr [2007-10-16 16:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Plan to start from 17:15 UT. Conditions good. Michal [2007-10-15 16:30, SkalnatePleso] [Remove]
Message sent to observers

· Working from SRO tonight to catch .755 event. [2007-10-15 01:27, Sonoita] Message sent to BinAstPhotSurvey conference

· We canceled our tonight's plan on 16635 due to background stars near asteroid's path. Peter K. + Kamil [2007-10-13 18:34, Ondrejov] Message sent to observers

· We should be able to catch the event predicted for tonight (phase 0.755) although there will be some interference from
nearby background stars. Best wishes, Kamil & Peter [2007-10-13 08:51, Ondrejov]

· Trying to catch whole 0.250 phase, perhaps with wings, if cirrus permits. Started at 18:21 UT on Oct.11, 2007.

Stefan [2007-10-11 18:55, Modra] Message sent to BinAstPhotSurvey conference

· Peter has covered most of the 0.75-phase event on the past night Oct. 5.8. The event has deepened since its previous last good coverage on Sept. 17.0.
Other recent data:
2007-09-29.9 and 10-03.8 by Jozef, Stefan and Adrian from Modra, covered a part of the 0.25-phase event;
2007-10-01.1 by Don from Carbuncle Hill, covered the 0.25-phase event, but a residual variation after the event not understood;
2007-10-01.8 by Peter K. from here, short session covering a part of the 0.75-phase event, may be useful after linkage;
2007-10-03.8 by Vasilij Chiorny from Kharkiv, short session in the 0.25-phase event, usefully combined with the Oct. 03.8 session from Modra.
http://www.asu.cas.cz/~asteroid/16635_p1.png
http://www.asu.cas.cz/~asteroid/16635_p2.png
http://www.asu.cas.cz/~asteroid/16635_p2_porb.png

Ok, the deepening of the event is a feature we have been looking for. More good data (errors not greater than 0.02 mag) covering events are needed to describe it well and further monitor the evolution. Ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2007-10- 6 11.94 0.250
2007-10- 7 20.19 0.250
2007-10- 9 4.44 0.250
2007-10-10 12.69 0.250
2007-10-11 20.94 0.250
2007-10-13 5.19 0.250
2007-10-14 13.44 0.250
2007-10-15 21.69 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007-10- 7 4.21 0.755
2007-10- 8 12.46 0.755
2007-10- 9 20.71 0.755
2007-10-11 4.96 0.755
2007-10-12 13.21 0.755
2007-10-13 21.46 0.755
2007-10-15 5.71 0.755
2007-10-16 13.96 0.755

Cheers, Petr [2007-10-08 08:09, Ondrejov]

· I started this at 00:00 UT in uncertain conditions. I could potentially catch part of the 0.760 phase event if it stays clear.
Don [2007-10-06 00:27, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I finished my observation at 23 UT due to fog. Peter K. [2007-10-05 23:36, Ondrejov] Message sent to observers

· Just started this target (18:30 UT) and should be able to observe it to 1 UT and catch tonight's event but some background stars will interfere. Peter K. [2007-10-05 18:31, Ondrejov]

· We switched to this target to continue Don's run. We started at 2:45 UT. John G [2007-10-05 02:47, Sonoita] Message sent to observers

· Started this at about 00:00, Oct 5 UT. If it doesn't fog up, I should catch the 0.255 phase event.
Don [2007-10-05 00:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Just an attempt to help - no success expected under changing conditions. Adrian [2007-10-03 19:06, Modra] Message sent to observers

· I started this at about 00:00 Oct 1 UT to catcg the 0.255 phase event.
Don [2007-10-01 03:47, CarbuncleHill]

· we are trying to catch the 0.255 event, the second half at least. will see if the clouds disappear soon enough...jozef, stefan [2007-09-29 18:54, Modra]

· For this binary, we need one more coverage of one of its events (errors <0.02 mag) to see how the events evolve. If we are lucky and the events evolve towards more central, we will get an opportunity to estimate D_2/D_1 better than the earlier data have allowed so far. Then it will be ready for publication.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-29 18.61 0.255
2007-10- 1 2.86 0.255
2007-10- 2 11.11 0.255
2007-10- 3 19.36 0.255
2007-10- 5 3.61 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-30 10.91 0.760
2007-10- 1 19.16 0.760
2007-10- 3 3.41 0.760
2007-10- 4 11.66 0.760
2007-10- 5 19.91 0.760

Cheers, Petr [2007-09-25 08:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 23:50, Sep 20 UT to catch the 0.757 phase event.
Don [2007-09-20 23:56, CarbuncleHill]

· I started a run at 00:24 UT to catch the 0.261 phase event.
Don [2007-09-19 00:26, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· New data joined in:
2007-09-14.9, 15.9 and 17.0 by Jozef and Stefan from Modra
2007-09-16.2 by Don from Carbuncle Hill
2007-09-16.3 by Bob from GMARS.
The solution has been nailed down:
P_1 = 2.2084 +/- 0.0002 h
P_2 = 7.624 +/- 0.002 h
P_orb = 32.25 +/- 0.03 h
A_1 = 0.17 mag
A_2 = 0.05 mag
except for size ratio where only a lower limit has been estimated because the events are not central (don't show a flat bottom):
D_2/D_1 >= 0.26
http://www.astro.cz/~asteroid/16635_all.png
http://www.astro.cz/~asteroid/16635_porb_p2.png
http://www.astro.cz/~asteroid/16635_p1.png
http://www.astro.cz/~asteroid/16635_p2.png
http://www.astro.cz/~asteroid/16635_p2_nsp.png

Before we announce this one on a circular, it would be good to check whether the events geometry doesn't evolve towards more central. If it does, then we may get an opportunity to establish D_2/D_1 better later on. If no, we will go with the lower limit on the size ratio for now. To show that, additional good observations of events before the full moon will be needed, with errors <0.02 mag. Ephemeris is below. No more data outside events (except phases before and/or after the events, so that the additional data can be joined properly with the previous data) are needed.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-18 8.55 0.757
2007- 9-19 16.80 0.757
2007- 9-21 1.05 0.757
2007- 9-22 9.30 0.757
2007- 9-23 17.55 0.757

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-17 16.55 0.261
2007- 9-19 0.80 0.261
2007- 9-20 9.05 0.261
2007- 9-21 17.30 0.261
2007- 9-23 1.55 0.261

Great work all on this one so far.

Cheers, Petr [2007-09-17 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:30 UT.
Don [2007-09-17 02:04, CarbuncleHill]

· I will be extending Don's run, starting at about 4:00 UT.

Bob [2007-09-16 02:06, Santana] Message sent to BinAstPhotSurvey conference

· I'll be extending Modra's run tonight. Started run at 00:20 UT.
Don [2007-09-16 00:22, CarbuncleHill]

· Continuing tonight with another session, started at 19.00 UT, expecting a few hours of good weather. Jozef, Stefan [2007-09-15 19:18, Modra] Message sent to BinAstPhotSurvey conference

· Last night for this one was good only for the first 2 hours. Then came here a fog. So I sent to Ondrejov short arc of LC.

Next night looks not good for observation, I see on weather maps clouds and stronger wind.
Marek [2007-09-15 11:56, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Session started at 4:00 UT at GMARS. [2007-09-15 03:06, Santana]

· SRO is back in business after the monsoon. We will try to get a long run on this tonight.

-Walt [2007-09-15 02:33, Sonoita] Message sent to BinAstPhotSurvey conference

· Session started at 19:55 UT in perfect conditions, hope to take 4-5 hours run = if weather persist.Michal & Marek. [2007-09-14 20:05, SkalnatePleso] [Remove]

· New data joined in:
2007-09-13.2 and 14.2 by Don from Carbuncle Hill
2007-09-14.0 by Michal and Marek from Skalnate Pleso
2007-09-14.0 by Stefan and Jozef from Modra.
In all the data taken so far, but especially in the four latest high quality sessions, there appeared also a small additional variation outside events. With the more abundant and high quality dataset now, I have been able to solve for it. A full solution that fits all the variation seen there is
P_1 = 2.20838 +/- 0.00003 h
P_2 = 7.617 +/- 0.002 h
P_orb = 32.27 +/- 0.03 h
A_1 = 0.17 mag
A_2 = 0.04 mag
D_2/D_1 >= 0.27
http://www.asu.cas.cz/~asteroid/16635_all.png
http://www.asu.cas.cz/~asteroid/16635_p1.png
http://www.asu.cas.cz/~asteroid/16635_porb_p2.png
http://www.asu.cas.cz/~asteroid/16635_p2.png
http://www.asu.cas.cz/~asteroid/16635_p2_nsp.png
A proposed interpretation for P_2 is that it is a rotation of an asynchronous secondary.

A few more good sessions with errors <0.02 mag are needed both in and outside events to nail down the solution.

Cheers, Petr [2007-09-14 17:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started a run on this at 00:30 UT in excellent conditions.
Don [2007-09-14 00:47, CarbuncleHill]

· Session stated at 20:00 UT with seeing, but in clear sky conditions - hope to take 4-5 hours at least. Michal [2007-09-13 20:05, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Two new sessions joined in
2007-09-05.0 by Vasilij Chiorny from Kharkiv (2.9h long)
2007-09-12.2 by Russ Durkee from Shed of Science Observatory (5.8h long)
Russ has covered the 0.25-phase event. Solution for P_orb has shifted slightly to ~32.27 h. One more session covering the event could nail it down. It should also establish its shape better than we have it now. Shape of the other event around orbital phase 0.75 has been poorly established so far, a couple good sessions covering it are needed. A few more sessions outside events are also needed, to complete coverage of the long-period component there.
http://www.asu.cas.cz/~asteroid/16635_all.png
http://www.asu.cas.cz/~asteroid/16635_longpc.png
http://www.asu.cas.cz/~asteroid/16635_shortpc.png

Cheers, Petr [2007-09-13 08:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at 00:30 UT.
Don [2007-09-13 00:45, CarbuncleHill]

· Did a run on this one on 9/12 starting at 3UT.

Russ [2007-09-12 20:00, Shed of Science] Message sent to BinAstPhotSurvey conference

· Four good long sessions by Don of Sept. 5, 6, 7, and 8 joined in, he caught one and half event. A solution P_orb = 32.4 h is being nailed down. One more good coverage of each of the two events as well as completing a coverage outside events is needed to finish the discovery phase for this one.
http://www.astro.cz/~asteroid/16635_longpc.png

Great work, Don, on the binary so far!

Cheers, Petr [2007-09-10 08:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run at around 01:20 UT after some early equipment problems.
Don [2007-09-08 02:06, CarbuncleHill]

· Started at 00:40UT.
Don [2007-09-07 02:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Our marginal suspicion that 16635 might be binary from the first two nights that we communicated here on August 16 has become much more serious with three new sessions that Don took recently. The short period appears unique: 2.20836 h. For a long period component, a possible solution is 32.4 h, but more data (at any time) are needed to really establish it.
http://www.asu.cas.cz/~asteroid/16635_all.png
http://www.asu.cas.cz/~asteroid/16635_longpc.png
http://www.asu.cas.cz/~asteroid/16635_shortpc.png

So, now we have three new binaries in works: 32008, 10208, and 16635. 32008 should be finished soon (see my message I sent here a few ten minutes ago). Then, please, those of us who can work the fainter one 10208 with sufficient accuracy (errors not greater than 0.03 mag) please concentrate on it. If you cannot work 10208, then please try 16635 which is a bit brighter (again, errors <=0.03 mag are needed).

Clear Skies, Petr [2007-09-05 11:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:30 UT under very good conditions.
Don [2007-09-02 00:28, CarbuncleHill]

· Don has taken two sessions for this one. There are a few possible periods, and some more promissing of them have a few points attenuated. So, it might be a binary, but we cannot call it to be a real binary suspect until the main period is well established and deviations from it are obvious. One possible solution, with a few deviating points marked with x's, see
http://www.asu.cas.cz/~asteroid/16635.png
Don will be probably clouded out for the next couple nights, and then he will be on a trip until Aug 25, so we encourage one or more stations to take it over and observe it thoroughly.

Cheers, Petr [2007-08-16 09:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yes, me once again. Doing a second run on this starting at 02:45 UT. Now watch, the sky will fog up.
Don [2007-08-15 03:04, CarbuncleHill]

(7517) 1989 AD (Finished) [Add new note]
· Bob has done this one with two full nights: Unique period, good coverage (a small gap in double coverage is tolerable), no deviation seen,
http://www.asu.cas.cz/~asteroid/07517.png
It is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Bob.

Cheers, Petr [2007-11-05 10:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a second night from GMARS. Unique period of 9.703 with an amplitude of almost 1.2 magnitudes. No deviations seen. Data sent ot Peter. [2007-11-04 18:02, Santana] Message sent to observers

· Starting tonight from GMARS. Bob [2007-11-03 01:21, Santana] Message sent to BinAstPhotSurvey conference

(1405) Sibelius (Finished) [Add new note]
· This one has been done by Don from Carbuncle Hill (4 nights), by Peter and Kamil from here (3 calibrated nights), and by Adrian from Modra (1 night): U=3- result, good coverage, no significant deviation that would suggest a binarity.
http://www.asu.cas.cz/~asteroid/01405.png
It is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don, Peter, Kamil and Adrian, on this low-amplitude one.

Cheers, Petr [2007-10-23 09:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data by Peter and Kamil from here (3 calibrated nights), by Don from Carbuncle Hill (4 nights), and by Adrian from Modra (1 night) have revealed that it is 6.06 or 12.12 h:
http://www.asu.cas.cz/~asteroid/01405_6h.png
http://www.asu.cas.cz/~asteroid/01405_12h.png
Two high quality full night sessions, one from Europe and one from USA in good conditions after the Moon isn't an issue will be needed to resolve the ambiguity.

Cheers, Petr [2007-10-22 11:48, Ondrejov] Message sent to observers

· Started at 01:45 UT.
Don [2007-10-21 00:56, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Interrupted due to clouds...Adrian [2007-10-17 19:35, Modra] Message sent to observers

· As 16635 is done by Michal I left it. This target was recommended to be done by Peter as clouds are expected in Ondrejov. So I'm trying - but some clouds are expected even here (later). Adrian [2007-10-17 18:12, Modra] Message sent to observers

· I started this at 23:45, Oct 16 UT.
Don [2007-10-16 23:43, CarbuncleHill]

· I will be observing this one between 22:30-02:45 UT. Best wishes, Kamil [2007-10-15 21:16, Ondrejov] Message sent to observers

· I started this at 00:06 UT in very good conditions.
Don [2007-10-15 00:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· We tried this target last night for 1,5 h and will continue tonight. It will be complementary target for 4029. Peter K. + Kamil [2007-10-14 18:00, Ondrejov]

· Began this new target at 23:40, Oct 13 UT.
Don [2007-10-14 00:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(2896) Preiss (Finished) [Add new note]
· Abundant data by Don from Carbuncle Hill supported by David from Hunters Hill (3 nights), by Kamil from here (1) and by Russ from Shed of Science Observatory (1) suggest a period commensurate with 1 day, but no good solution. As a P>10 h object, we close it for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2007-10-23 09:26, Ondrejov] Message sent to observers

· Observed 2007-10-19 from 09:30UT to 15:29UT in reasonable conditions. I believe that I am taking the same part of the curve each night resolving a period of approx 24.14 +/- 0.06 hrs with an amplitude > 0.2 +/- 0.01mag [2007-10-20 01:35, HuntersHill] Message sent to observers

· Observed 2007-10-18 from 09:14UT to 13:33UT in good conditions until a wind storm hit and closed the observatory. [2007-10-18 22:31, HuntersHill]

· Observed 2007-10-17 from 09:23UT to 14:54UT in good conditions till cloud ended the session. [2007-10-17 23:00, HuntersHill] Message sent to observers

· This little devil (w/ a period around 24h) is included in tonight's run with low density coverage.
Don [2007-10-05 00:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll start a run on this at ~01:30 UT.
Don [2007-09-19 00:35, CarbuncleHill]

· Started at 01:45 UT.
Don [2007-09-18 03:13, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this at ~1:30 UT.
Don [2007-09-17 02:11, CarbuncleHill]

· Starting at about 01:40 UT.
Don [2007-09-16 00:28, CarbuncleHill]

· Just enough room left in tonight's schedule for this mag 14.2 object. Starting at 01:50 UT.
Don [2007-09-13 01:43, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 02:40 UT. I had room left on one scope for a bright object that needed lower density coverage.
Don [2007-09-07 02:51, CarbuncleHill]

· Observed this last night from 3:30UT to about 9:30UT

Russ [2007-09-04 20:29, Shed of Science] Message sent to BinAstPhotSurvey conference

· I'll be doing this one at 02:30 UT.
Don [2007-09-02 00:30, CarbuncleHill]

· I'll be starting this at 03:51 UT to extend Kamil's run.
Don [2007-08-15 02:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I will be observing (2896), from 23:45 to 02:00 UT. Best wishes, Kamil [2007-08-14 21:30, Ondrejov]

· Will be starting this at 04:20 UT. The first night was clouded out.
Don [2007-08-09 01:58, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting this one tonight.
Don [2007-08-06 02:12, CarbuncleHill]

(1150) Achaia (Finished) [Add new note]
· Adrian et al. have done this slow rotator pretty well from Modra (11 linked nights), Vasilij Chiorny has contributed with two relative nights from Kharkiv. A unique solution:
http://www.asu.cas.cz/~asteroid/01150.png
It is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work, Adrian et al.

Cheers, Petr [2007-10-23 08:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Additional data for this one joined in. The five Modra nights (four of them linked) and the two relative Kharkiv nights indicate a period of 61.2 h (U=2+),
http://www.asu.cas.cz/~asteroid/01150.png
The target has a low priority for the Survey, it might be good as a secondary target.

Cheers, Petr [2007-10-09 13:53, Ondrejov] Message sent to observers

· Three nights by Stefan and Adrian from Modra and one night by Vasilij from Kharkiv have revealed that this one is a slow rotator. A minimum (bimodal) period is 31 h.
http://www.asu.cas.cz/~asteroid/01150.png

Cheers, Petr [2007-10-08 09:08, Ondrejov] Message sent to observers

· Just a very short session by me on Oct 5/6, but linked with session by Leos on Oct 6/7. All data up to date indicate a long period - maybe around 62 h. The amplitude of the lightcurve is about 0.4 - 0.5 mag. Adrian [2007-10-07 14:46, Modra] Message sent to observers

· Due to high background (Moon+cirrus) I started this bright new target at 23:23UT on Oct.1, 2007. Thus, result is very uncertain. A weather forecast is poor, too.

Stefan [2007-10-01 23:49, Modra] Message sent to BinAstPhotSurvey conference

(10443) van der Pol (Finished) [Add new note]
· Closing it, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2007-10-23 08:09, Ondrejov]

· For this target, one more session during these nights could resolve remaining ambiguity,
http://www.asu.cas.cz/~asteroid/10443.png
It doesn't look likely that stations that worked it so far (Modra, S. Pleso, Carbuncle Hill) will be able to take the one more needed night, so a help from another station able to work the target (V~16.8, Dec~-9 deg) is requested.

Clear Skies, Petr [2007-10-04 12:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object observed from 19:00 UT to 23:10.UT, 20. September. Gabo [2007-09-20 23:09, SkalnatePleso] [Remove]

· I catched 2.7h run only. Yes, I suggest the period is about 3.3h.
Here I have to say that the weather has no favourable prognosis for next two nights (Mon/Tue and Tue/Wed) for Skalnate Pleso. [2007-09-16 23:31, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· I try this one at 19:00 UT. But sky is variable (stronger wind and not clear). I suppose do it about 5 hours.
Marek [2007-09-16 19:04, SkalnatePleso] [Remove]

· Adrian has reduced the third Modra night for this one. It is good data, the period is 3.35 h (U=2+):
http://www.asu.cas.cz/~asteroid/10443.png
It looks promissing that the target will be done easily with a few good nights in the next lunation when it is near opposition and brightest.

Cheers, Petr [2007-07-31 08:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been also picked up by observers themselves. It didn't get through my selection criteria into the list of proposed targets for the July lunation because it was just below the nominal limit of the Survey, but it will be bright enough in the August lunation to do it well, so it should be OK. The three initial nights (2 by Stefan from Modra and 1 by Don) suggest a period of about 3.33 h (U=2+):
http://www.asu.cas.cz/~asteroid/10443.png
but good data around its opposition in the next lunation will be needed to establish this one well.

Cheers,

Petr [2007-07-30 13:53, Ondrejov] Message sent to BinAstPhotSurvey conference

(10313) Vanessa-Mae (Finished) [Add new note]
· U=1 ressult, not sufficient to be included into the BinAstPhotSurvey sample. Closing it. Petr [2007-10-22 14:33, Ondrejov]

· Observed 2007-08-29 from 09:04UT to 15:54TU in moon affected conditions. Poor SNR lead to higher than expected errors (~0.04mag). That said, some indications of a period of around 2.8hrs with an amplitude of 0.35 +/- 0.04mag. [2007-08-30 06:16, HuntersHill] Message sent to BinAstPhotSurvey conference

· I may not be able to continue with this target soon since my resources are tied up with 10208. Please feel free to continue on with it. Unfortunately the moon will be around for a while and 10313 has just past opposition. [2007-08-26 06:10, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started this target at 11:10UT and completed at 17:21 UT 2007-08-12. Good condition. Some scatters present with uncertain period. Data sent in [2007-08-12 21:36, Blue Mountains Obs]

(10208) 1997 QN1 (Finished) - BINARY [Add new note]
· Julian has taken three sessions monitoring an evolution of the 0.20/0.26-phase events during Sept. 28.5-Oct. 15.5.
http://www.asu.cas.cz/~asteroid/10208_longpc_07sept_oct.png
Current apparition for the binary is over.

Cheers, Petr [2007-10-17 10:28, Ondrejov]

· Observed from 09:14UT to 14:13 UT 2007-10-15 capturing the 0.2 phase event. [2007-10-16 02:45, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed from 08:58UT to 14:29UT capturing both 0.2 and 0.26 events. Data sent in. [2007-10-01 04:54, Blue Mountains Obs]

· Our announcement on (10208) has appeared on CBET 1087. I am copying a text of the announcement here for your convenience.

Cheers, Petr

(10208) 1997 QN1
J. Oey, Leura, N.S.W., Australia; P. Pravec and P. Kusnirak, Ondrejov
Observatory; Yu. Krugly and V. Chiorny, Institute of Astronomy of Kharkiv
National University, Main Astronomical Observatory, National Academy of
Science of Ukraine; and J. Ries, McDonald Observatory, report that
photometric observations obtained during Aug. 6-Sept. 18 reveal that minor
planet (10208) is a binary system with an orbital period of 58.55 ± 0.02
hr. The primary shows a period of 3.3484 ± 0.0001 hr, and it has a light-
curve amplitude of 0.13 mag. Mutual eclipse/occultation events, with a depth
of 0.21 mag on Sept. 15, indicate a secondary-to-primary mean-diameter ratio
of 0.46 ± 0.02. Calibrated data give an estimated mean absolute magnitude
H_R = 14.2 ± 0.2, assuming G = 0.15 ± 0.2.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2007 CBAT
2007 September 25 (CBET 1087) Daniel W. E. Green [2007-09-25 15:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· An announcement on this binary should appear soon. Monitoring evolution of events in October will be useful for future modeling of the system. Conditions for the target are favorable for Julian only.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-28 10.18 0.205
2007- 9-30 20.73 0.205
2007-10- 3 7.28 0.205
2007-10- 5 17.83 0.205
2007-10- 8 4.38 0.205
2007-10-10 14.93 0.205
2007-10-13 1.48 0.205
2007-10-15 12.03 0.205

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-28 13.37 0.260
2007- 9-30 23.92 0.260
2007-10- 3 10.47 0.260
2007-10- 5 21.02 0.260
2007-10- 8 7.57 0.260
2007-10-10 18.12 0.260
2007-10-13 4.67 0.260
2007-10-15 15.22 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-29 15.42 0.705
2007-10- 2 1.97 0.705
2007-10- 4 12.52 0.705
2007-10- 6 23.07 0.705
2007-10- 9 9.62 0.705
2007-10-11 20.17 0.705
2007-10-14 6.72 0.705
2007-10-16 17.27 0.705

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-29 18.67 0.760
2007-10- 2 5.22 0.760
2007-10- 4 15.77 0.760
2007-10- 7 2.32 0.760
2007-10- 9 12.87 0.760
2007-10-11 23.42 0.760
2007-10-14 9.97 0.760
2007-10-16 20.52 0.760

Cheers, Petr [2007-09-25 10:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2007-09-14.5, 15.5, 17.5, and 18.5 by Julian from Leura
2007-09-15.2 by Judit from McDonald Observatory
2007-09-15.9 by Peter K. from here.
Current solution:
P_1 = 3.3484 +/- 0.0001 h
A_1 = 0.13 mag
P_orb = 58.55 +/- 0.02 h
Depth of total secondary event: 0.21 mag on Sept. 15
D_2/D_1 = 0.46 +/- 0.02.
Data taken during Sept. 12-18 have revealed that there have developed other shallower events at orbital phases 0.05 before the main events,
http://www.asu.cas.cz/~asteroid/10208_longpc_07sept.png
They are the other kind of events (eclipses/occultations) than the main events; shadow and projected profile are spatially separated at solar phases around 20 deg in the relatively wide binary, so the resulting events are separated temporally. The features will be very useful in future modeling of the system. Below are predicted times for the four events that will occur before the Moon begins to interfere seriously. The 0.705-phase event can be covered from Europe tonight. The 0.76-phase one might be covered at least partially by Don tonight (if you can work the asteroid with errors not greater than 0.03 mag right after dusk). The 0.205- and 0.26-phase events on Sept. 21 might be covered from US stations. After Sept. 21, the discovery phase for the binary should be over and we will announce it on a circular.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-19 21.22 0.705
2007- 9-20 0.47 0.760
2007- 9-21 2.53 0.205
2007- 9-21 5.72 0.260

Great work, Julian and all on this one.

Cheers, Petr [2007-09-19 11:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observe from 08:50 UT to 15:04 UT 2007-09-18. Primary lightcurve data only. [2007-09-19 02:05, Blue Mountains Obs]

· Observation done from 10:26UT to 15:35UT 2007-09-17 in good condition before being cut short by cloud. Event of Phase 0.76 captured fully at 14:15UT but with contamination from background star. Data looks OK after REduction with SBG. [2007-09-18 01:21, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· New data joined in:
2007-09-12.6 and 13.5 by Julian from Leura
2007-09-12.8 by Vasilij from Kharkiv.
They covered the 0.76phase event on Sept 12 - the decreasing branch was covered by Julian and the increasing branch by Vasilij, with only 45-min gap inbetween (almost a continuous coverage from Leura+Kharkiv :-) . The orbital period is refined to 58.56 +/- 0.02 h now.
http://www.asu.cas.cz/~asteroid/10208_all.png
http://www.asu.cas.cz/~asteroid/10208_longpc.png
http://www.asu.cas.cz/~asteroid/10208_shortpc.png
One more coverage of both events, as well as some data outside them, are needed to nail down the solution. An updated events ephemeris:

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-17 14.15 0.763
2007- 9-20 0.71 0.763

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-16 8.67 0.260
2007- 9-18 19.23 0.260
2007- 9-21 5.79 0.260

Cheers, Petr [2007-09-16 10:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· observed from 08:48UT to 16:39 UT 2007-09-15 in excellent condition. If weather holds, I should be able to capture the second half of event tonight. [2007-09-16 03:23, Blue Mountains Obs]

· Trying this one from 19:40 UT with our new CCD and will observe to 22:30 UT. Peter K. [2007-09-15 20:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 09:00UT and finished at 16:15UT 2007-09-14 in good condition. [2007-09-15 12:44, Blue Mountains Obs]

· I got a little more than 5 hours of data. Unfortunately, for the first 4 hours it was moving slowly between two medium and a bright star. The humidity was a bit high, but otherwise clear.

Data will be sent to Petr in a day or two.

Judit [2007-09-15 09:44, McDonald Observatory] Message sent to BinAstPhotSurvey conference

· Started observing at 2:45 UT. Missed the beginning of the event, but if the weather holds, I will be able to follow it for 4 to 5 more hours.

Judit [2007-09-15 06:55, McDonald Observatory]

· Observed from 09:42UT to 14:42 UT 2007-09-13 cut short by sudden cloud cover. [2007-09-14 02:21, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed from 10:38UT to 17:13UT 2007-09-12 in good condition. Event captured as predicted. Data sent in. [2007-09-13 00:52, Blue Mountains Obs]

· Observations were done on 2007-09-12 from 17:40 to 22:00.
Yura and Vasilij Ch. [2007-09-12 22:14, Kharkiv] Message sent to BinAstPhotSurvey conference

· Yes, Julian, a nice primary event captured. P_orb of 58.6 h appears very likely now. (One small uncertainty see my comment in email I sent you separately.)
http://www.asu.cas.cz/~asteroid/10208_all.png
http://www.asu.cas.cz/~asteroid/10208_longpc.png
http://www.asu.cas.cz/~asteroid/10208_shortpc.png
More data for both events as well as outside them are needed to nail down the solution for the events as well as to describe an apparent small evolution of the primary lightcurve component. Ephemeris for the events:

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-13 22.15 0.280
2007- 9-16 8.80 0.280
2007- 9-18 19.45 0.280
2007- 9-21 6.10 0.280

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-12 17.36 0.790
2007- 9-15 4.01 0.790
2007- 9-17 14.66 0.790
2007- 9-20 1.31 0.790

Cheers, Petr [2007-09-12 08:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· An interesting night after more than a week of bad weather. Session started at 09:02UT and finished at 16:24UT in variable condition due to patchy cloud. I believe that I have captured a full deep event presumably primary. Weather report predicted to be fine for the rest of the week. Anyone care to help? Relatively faint target now at 16.5m and receeding. Data sent in. [2007-09-11 23:57, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· You will be interested to read that Julian has caught a couple deep events in 10208 recently. See following plots (a solution for long period component is not good yet):
http://www.asu.cas.cz/~asteroid/10208_all.png
http://www.asu.cas.cz/~asteroid/10208_longpc.png
http://www.asu.cas.cz/~asteroid/10208_shortpc.png

After 32008 is done (hopefully in a few days), we should certainly turn our efforts to 10208 to help Julian with it.

Cheers, Petr [2007-09-03 13:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Session started from 08:50 UT and finished at 15:49UT 2007-09-02 under good condition. Cut short by late clouds. No events detected. [2007-09-02 23:30, Blue Mountains Obs]

· Session started at 09:20 UT and finished at 16:45UT 2007-08-31 under good condition. Looks like I captured the whole event lasting about 2.5 hours starting from 12:00UT. [2007-09-01 09:33, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observation were done on 2007-08-26 for a full night but only the first 4 hours were deemed useful due to bright moon 25 deg away. Data sent in. [2007-08-27 06:06, Blue Mountains Obs]

· 2 nights of observations done on 2007-08-17 at 11:17UT and 18:42 UT and 2007-08-25 at 09:16 to 17:48UT. There appear to be an event caught in the first hour of 25/08 data. Data sent in for analysis. [2007-08-26 06:01, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This object has been worked by Julian from Leura on five nights during 2007-08-06.6 to 11.6. His data have revealed a period of 3.350 h. Most of the data fit together well, except what appeared to be a more or less steady decrease during the first night and a similar effect before the end of the fourth night. Since both nights were taken in somewhat poorer sky conditions, Julian suspected that the deviations in the first and before the end of the fourth night might be artifacts due to the poorer conditions. And since the deviation in the first night didn't look like an attenuation, and both were a bit marginal (near a nominal detection limit of the Survey), we agreed that the object didn't appear to be a good binary candidate and closed it as a binary non-detection a couple days ago. Yesterday, however, Julian re-reduced the first night's observations carefully, eliminated images most affected by the poor conditions of the night, and his re-reduced data show a good fit for more than half of the session plus what appears to be an attenuation detected just at the limit of the Survey (depth of 0.04 mag). Assuming that also the decrease before the end of the fourth night was a partially covered attenuation and not an artifact as suspected before, I have got a tentative solution for the events of P=63 hours. See following plots
http://www.asu.cas.cz/~asteroid/10208_all.png
http://www.asu.cas.cz/~asteroid/10208_longpc_contacts.png
http://www.asu.cas.cz/~asteroid/10208_shortpc.png
If the solution is correct, next events are predicted to occur around following times:

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8-17 5.54 0.755
2007- 8-19 20.54 0.755
2007- 8-22 11.54 0.755
2007- 8-25 2.54 0.755

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8-15 22.07 0.255
2007- 8-18 13.07 0.255
2007- 8-21 4.07 0.255
2007- 8-23 19.07 0.255

I encourage you to observe this one (errors <0.03 mag are needed) to help Julian to confirm the events and to establish the solution. Observations around the above times should be most constraining, but long sessions taken at any times should contribute to the solution well.

Cheers, Petr [2007-08-15 10:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has been done by Julian from Leura on five nights: Unique solution, very good coverage, no event seen,
http://www.asu.cas.cz/~asteroid/10208.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-08-13 07:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· 2 more nights of observations done. 10:37 to 16:10 UT 2007-08-10 in poor condition. Images were bloated but useful however gradual dimming of lightcurve may be caused by the poor seeing. Better condition were observed on the following night of 2007-08-11 between 09:35 and 19:20 UT. Again no deviation detected. Data sent in. [2007-08-12 00:05, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed from 08:21 to 17:50UT 2007-08-08. Period refined to 3.355h +/- 0.003h. No deviation detected. [2007-08-09 11:20, Blue Mountains Obs]

· Observed from 11:14 to 18:46 UT 2007-08-07 in good condition. Data sent in. [2007-08-08 05:37, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observation started on this target at 10:08UT and completed at 19:40 UT. Preliminary period is 3.41h +/-0.02h. [2007-08-07 02:15, Blue Mountains Obs]

(1736) Floirac (Finished) [Add new note]
· This one has been done by David from Hunters Hill (3 nights), by Stefan and Leos from Modra (3), by Peter and Kamil from here (1), by Don from Carbuncle Hill (1), and by Michal and Marek from S. Pleso (1): Unique period, good coverage, no significant deviations seen,
http://www.asu.cas.cz/~asteroid/01736.png
It is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2007-10-16 10:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this at about 01:30 UT, and will extend Michal's run.
Don [2007-10-15 00:37, CarbuncleHill]

· Observing from 22:50 UT in good conditions. Michal [2007-10-14 22:53, SkalnatePleso] [Remove]
Message sent to observers

· I plan to start this at 01:40 UT.
Don [2007-10-14 00:09, CarbuncleHill]

· Three nights by David from Hunters Hill have revealed two possible periods: both 6.78 h and 7.908 h fit equally well. The two solutions differ by 0.5 rot/day (i.e., there occur 3.54 and 3.04 cycles per day, respectively). The ambiguity can be resolved with a single night from a station on another continent. I encourage someone who is not busy with other targets to help out.
http://www.asu.cas.cz/~asteroid/01736.png
http://www.asu.cas.cz/~asteroid/01736_a.png

Clear Skies, Petr [2007-10-09 09:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-08 from 11:18UT to 18:31UT in good conditions. Data refines period to 6.779 +/- 0.004hrs with an amplitude of 0.08 +/0 0.005mag. Data sent to Petr. [2007-10-08 22:26, HuntersHill] Message sent to observers

· Observed 2007-10-05 from 11:17UT to 15:50UT in poor conditions (strong wind, haze and closed due to cloud. Data refines the period to 6.793 +/- 0.014hrs with an amplitude of 0.09 +/- 0.02mag. No deviations noted but double coverage has not yet been achieved. [2007-10-06 03:28, HuntersHill] Message sent to observers

· Observed 2007-10-04 from 11:34UT to 18:49UT in reasonable conditions. Data reveals a period of 6.78 +/- 0.08hrs amplitude 0.09 +/- 0.01mag. (Discovered a new Eclipsing Binary in the field) [2007-10-04 22:30, HuntersHill] Message sent to BinAstPhotSurvey conference

(3544) Borodino (Finished) [Add new note]
· David has done this one from Hunters Hill: Unique solution, good coverage, no significant deviation. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work again, David.

Cheers, Petr [2007-10-04 12:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-03 from 10:01UT to 18:43UT in poor conditions. Period refined to 5.442 +/- 0.002hrs with amplitude 0.6 +/- 0.01mag. No deviations noted in the curve. [2007-10-03 22:28, HuntersHill] Message sent to observers

· Observed 2007-10-02 from 10:05UT to 18:39UT in poor conditions. All data after 17:50UT removed due to very bright field star. Data reveals a period of 5.40 +/- 0.02hrs with an amplitude of 0.6 +/- 0.01mag. [2007-10-02 23:21, HuntersHill] Message sent to BinAstPhotSurvey conference

(85275) 1994 LY (Finished) [Add new note]
· After August 9, only one short session has been taken by Vishnu and Ron from Badlands on Aug. 11.2, covering phases outside events. So, no good solution for P_orb and D_2/D_1 has been obtained.
P_1 = 2.6962 +/- 0.0005 h
A_1 = 0.11 mag during 2007 July 30 to Aug. 11
H_R = 15.68 +/- 0.13, G = 0.07 +/- 0.05 (formal errors, real errors may be greater due to a possible aspect change)
http://www.asu.cas.cz/~asteroid/85275_07aug_all.png
http://www.asu.cas.cz/~asteroid/85275_07aug_longpc.png
http://www.asu.cas.cz/~asteroid/85275_07aug_shortpc.png

Ok, so this non-Survey binary discovered by Yura Krugly et al. has not been completed satisfactorily. Yura, feel free to discuss how you would like to publish the incomplete detection.

Petr [2007-09-25 11:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· This non-Survey target suspected to be binary by Yura and Nelya from their July observations from Kharkiv and Simeiz (with an assistance by a few more stations) has been observed on several nights in the current lunation:
2007-08-02.1, 3.1, 5.1, 6.1, and 9.1 by Don from Carbuncle Hill,
2007-07-30.9 by Juraj from Modra,
2007-08-03.9 and 4.9 by Yura from Kharkiv,
2007-08-04.9 and 5.9 by Peter K. from here.
The short period is well established: 2.6960 +/-0.0003 h, that is in perfect agreement with the estimate 2.6963 h (SynSid difference about 0.0003 h) from the July data.
All the recent sessions are relatively short (2-4 hours) due to the target's short nightly window, so a likelihood of detection of possible mutual events for the binary suspect has been limited. Nevertheless, there appear attennuations at beginnings of each of the three last sessions by Don. A drop before the end of the Juraj's session of July 30.9 supports it too. The data suggest a period commensurate with 1 day: 48.5 h, 24.3, or 16.2 h. A solution is also complicated by the fact that the asteroid's solar phase is high (around 50 deg) and its geometry changes relatively rapidly. The circumstances will cause that obtaining a good unique solution for the events will take more effort than for usual Survey targets. Below, I am giving a list of times around which observations should be particularly constraining and should help to establish the solution most, but observations at other times should be useful as well. Data with errors <0.03 mag only should be useful. In the first two following plots, the data are folded with the 48.5-h candidate period:
http://www.asu.cas.cz/~asteroid/85275_07aug_all.png
http://www.asu.cas.cz/~asteroid/85275_07aug_longpc.png
http://www.asu.cas.cz/~asteroid/85275_07aug_shortpc.png

Date/Time UTC (LTc.)
--------------------
2007- 8-11 2.16
2007- 8-12 2.46
2007- 8-13 2.76
2007- 8-14 3.06
2007- 8-15 3.36
2007- 8-16 3.66
2007- 8-17 3.96
2007- 8-18 4.26

Date/Time UTC (LTc.)
--------------------
2007- 8-11 14.30
2007- 8-12 14.60
2007- 8-13 14.90
2007- 8-14 15.20
2007- 8-15 15.50
2007- 8-16 15.80
2007- 8-17 16.10
2007- 8-18 16.40

Date/Time UTC (LTc.)
--------------------
2007- 8-10 18.85
2007- 8-11 11.05
2007- 8-12 3.25
2007- 8-12 19.45
2007- 8-13 11.65
2007- 8-14 3.85
2007- 8-14 20.05
2007- 8-15 12.25
2007- 8-16 4.45
2007- 8-16 20.65
2007- 8-17 12.85
2007- 8-18 5.05

Date/Time UTC (LTc.)
--------------------
2007- 8-11 2.47
2007- 8-11 18.67
2007- 8-12 10.87
2007- 8-13 3.07
2007- 8-13 19.27
2007- 8-14 11.47
2007- 8-15 3.67
2007- 8-15 19.87
2007- 8-16 12.07
2007- 8-17 4.27
2007- 8-17 20.47
2007- 8-18 12.67

Petr [2007-08-10 09:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 01:20 UT.
Don [2007-08-09 01:52, CarbuncleHill]

· Starting this one at 01:30 UT in excellent conditions.
Don [2007-08-06 01:34, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 20:40 UT. Peter K. [2007-08-05 21:25, Ondrejov]

· Observed for 2.7 hour last night. Peter K. [2007-08-05 08:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one at 01:15 UT in good conditions.
Don [2007-08-05 01:16, CarbuncleHill]

· I'm trying this one again tonight. Conditions are better.
Don [2007-08-02 01:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Moonlight and background stars ruined this run.
Don [2007-08-01 15:13, CarbuncleHill]

· Two smaller but useful sessions by Don from Carbuncle Hill taken on July 25.2 and 26.2 (duration 3+ hr each) fit well, the main period has been refined to 2.6963 +/-0.0002 h.
http://www.asu.cas.cz/~asteroid/85275_all.png
http://www.asu.cas.cz/~asteroid/85275_longpc.png
http://www.asu.cas.cz/~asteroid/85275_shortpc.png
No more attenuations seen in the best data so far, so the binary suspect has not been confirmed yet.

Three sessions reduced by Vishnu sent in, one from Lick (June 15) and the other two from Badlands (July 13 and 26). The isolated Lick June15 night is good and consistent with the solution. The two Badlands nights are of a slightly lower quality (higher noise/short duration), they are consistent with the solution from the best data above, but they don't improve it much.

The object is still observable in this lunation, but its conditions are gradually worseing. If you continue to work the object for Yura and Nelya, remember that long sessions (duration >2 h) with errors <0.02 mag are needed for it.

Cheers, Petr [2007-08-01 13:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run on this at 02:00 UT 8/01, after dealing with a computer problem. (No, it did not involve a sledge hammer.)
Don [2007-08-01 02:12, CarbuncleHill]

· Started observation at 20:00 UT
Juraj [2007-07-31 19:48, Modra] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-30/31. Juraj [2007-07-31 09:49, Modra]

· Trying this again tonight, although the moon may have an influence. [2007-07-25 03:14, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight, but clouds may interfere.
Don [2007-07-22 03:03, CarbuncleHill]

· Yura Krugly and Ninel Gaftonyuk have observed this Amor asteroid on four nights from Kharkiv and Simeiz. They found it to be a serious binary candidate. A main period is unique: 2.6971 +/-0.0002 h. There appeared a low-amplitude (0.03 mag) variation with a longer period on each of the four nights, and the latest night of July 16.9 showed a drop by 0.05 mag that may be an event (though only partial for its duration). A possible solution for the long period is ~12.6 h.
http://www.asu.cas.cz/~asteroid/85275_all.png
http://www.asu.cas.cz/~asteroid/85275_longpc.png
http://www.asu.cas.cz/~asteroid/85275_shortpc.png

Yura would appreciate if you could help him to catch more events so that their period can be established. Long sessions with errors <0.02 mag are needed for the low event depth.

Clear Skies,

Petr [2007-07-19 08:46, Ondrejov] Message sent to BinAstPhotSurvey conference

2007 DT103 (Finished) [Add new note]
· Last data for an event in this non-Survey binary have been taken by Don from Carbuncle Hill on August 12.0 and a short session by Vasilij from Kharkiv on August 17.0. No more data were taken later when the asteroid was favorably placed for southern hemisphere stations, apparently because the observers were busy with other targets. The available data don't allow a precise estimate of D_2/D_1, though the periods have been reasonably estimated:
P_1 = 2.5845 +/- 0.0005 h
P_2 = 15.32 +/- 0.1 h
A_1 = 0.16 mag during 2007 Aug. 5-8
http://www.asu.cas.cz/~asteroid/2007dt103_longpc.png
http://www.asu.cas.cz/~asteroid/2007dt103_longpc_070801_03.png

Don has linked a part of his sessions, but completing linkages will have to wait until the fields are observable again in the next year.

Petr [2007-09-25 11:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Three more nights joined in:
2007-08-08.0 by Vasilij Chiorny from Kharkiv
2007-08-09.3 and 12.2 by Don from Carbuncle Hill.
The Vasilij's Aug8.0 session joins nicely with the Modra session of the same night, the 0.7-phase event partially covered. Don has covered the 0.7-phase event again on Aug. 9.3, and the full 0.32-phase event on Aug. 12.3, see
http://www.asu.cas.cz/~asteroid/2007dt103_longpc_new.png

The 0.2/0.7 phase events have been evolving (shallowing) rapidly since Aug. 2 and we are not sure whether they disappear or merge with the 0.32/0.82 phase events as the geometry changes during following days. Updated ephemerides for the events are below, but don't limit your observations just around the predicted times as data outside events are needed as well.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8-13 11.37 0.200
2007- 8-14 2.70 0.200
2007- 8-14 18.03 0.200
2007- 8-15 9.36 0.200
2007- 8-16 0.69 0.200
2007- 8-16 16.02 0.200

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8-13 13.22 0.320
2007- 8-14 4.55 0.320
2007- 8-14 19.88 0.320
2007- 8-15 11.21 0.320
2007- 8-16 2.54 0.320
2007- 8-16 17.87 0.320

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8-13 19.34 0.720
2007- 8-14 10.67 0.720
2007- 8-15 2.00 0.720
2007- 8-15 17.33 0.720
2007- 8-16 8.66 0.720
2007- 8-16 23.99 0.720

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8-13 20.88 0.820
2007- 8-14 12.21 0.820
2007- 8-15 3.54 0.820
2007- 8-15 18.87 0.820
2007- 8-16 10.20 0.820
2007- 8-17 1.53 0.820

Cheers, Petr [2007-08-13 09:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 04:40 UT, and will catch the 08:06 event if all goes well.
Don [2007-08-09 01:56, CarbuncleHill]

· Stefan has covered about a half of the 0.7-phase event on the past night of Aug. 8.0. The event, like its counterpart 180 deg apart in anomaly around phase 0.2, is shallower now than it was on Aug. 2 when observed by Don the first time. Long period component of Aug. 4-8:
http://www.asu.cas.cz/~asteroid/2007dt103_longpc_new.png
Updated ephemerides for the events:

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8- 8 8.95 0.200
2007- 8- 9 0.35 0.200
2007- 8- 9 15.75 0.200
2007- 8-10 7.15 0.200
2007- 8-10 22.55 0.200
2007- 8-11 13.95 0.200
2007- 8-12 5.35 0.200
2007- 8-12 20.75 0.200
2007- 8-13 12.15 0.200
2007- 8-14 3.55 0.200
2007- 8-14 18.95 0.200

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8- 8 10.89 0.325
2007- 8- 9 2.29 0.325
2007- 8- 9 17.69 0.325
2007- 8-10 9.09 0.325
2007- 8-11 0.49 0.325
2007- 8-11 15.89 0.325
2007- 8-12 7.29 0.325
2007- 8-12 22.69 0.325
2007- 8-13 14.09 0.325
2007- 8-14 5.49 0.325
2007- 8-14 20.89 0.325

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8- 8 16.66 0.700
2007- 8- 9 8.06 0.700
2007- 8- 9 23.46 0.700
2007- 8-10 14.86 0.700
2007- 8-11 6.26 0.700
2007- 8-11 21.66 0.700
2007- 8-12 13.06 0.700
2007- 8-13 4.46 0.700
2007- 8-13 19.86 0.700
2007- 8-14 11.26 0.700
2007- 8-15 2.66 0.700

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8- 8 18.58 0.825
2007- 8- 9 9.98 0.825
2007- 8-10 1.38 0.825
2007- 8-10 16.78 0.825
2007- 8-11 8.18 0.825
2007- 8-11 23.58 0.825
2007- 8-12 14.98 0.825
2007- 8-13 6.38 0.825
2007- 8-13 21.78 0.825
2007- 8-14 13.18 0.825
2007- 8-15 4.58 0.825

Cheers, Petr [2007-08-08 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying it from 23:05 UT on Aug.7, 2007.

Stefan [2007-08-07 23:41, Modra]

· Following data have been analysed:
2007-08-01.9, 4.1, 5.0, 6.0, and 7.0 by Stefan and Juraj from Modra
2007-08-02.3, 3.2, 5.3, and 6.2 by Don from Carbuncle Hill.
A unique solution for the primary and a probable solution for the orbital period:
P_1 = 2.584 +/-0.001 h
P_orb = 15.35 h
D_2/D_1 >= 0.47
A_1 = 0.16 mag
The binary observed at high solar phases showed as many as four attenuations per orbit; both occultations and eclipses occured (separated in time for the high solar phase):
http://www.asu.cas.cz/~asteroid/2007dt103_all.png
http://www.asu.cas.cz/~asteroid/2007dt103_longpc.png
http://www.asu.cas.cz/~asteroid/2007dt103_shortpc.png
One of the four attenuations, the one around orbital phase 0.2, has been covered thrice: on Aug. 1.9, 3.2, and 7.0. It is evolving rapidly, suggesting that it is an occultation (with the line of the centers approximately aligned with the earth-asteroid line at the time). It is already rather shallow now, and further change of the geometry may cause it (as well as the other occultation 180 deg apart in anomaly, around phase 0.7 in the above plot) to disappear. Nailing down the solution with more data and monitoring an evolution of the events with changing geometry during following days will be needed. Also, the current estimate for D_2/D_1 of 0.47 is formally a lower limit, as shapes of the events suggest that they were not central; if the geometry moves to more central, we will be able to estimate the size ratio precisely. A help from more stations would be appreciated to cover it well. Below are ephemerides for the events, but don't limit your observations just around the predicted times.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8- 7 17.34 0.225
2007- 8- 8 8.69 0.225
2007- 8- 9 0.04 0.225
2007- 8- 9 15.39 0.225
2007- 8-10 6.74 0.225
2007- 8-10 22.09 0.225
2007- 8-11 13.44 0.225
2007- 8-12 4.79 0.225
2007- 8-12 20.14 0.225
2007- 8-13 11.49 0.225
2007- 8-14 2.84 0.225
2007- 8-14 18.19 0.225

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8- 7 19.35 0.355
2007- 8- 8 10.70 0.355
2007- 8- 9 2.05 0.355
2007- 8- 9 17.40 0.355
2007- 8-10 8.75 0.355
2007- 8-11 0.10 0.355
2007- 8-11 15.45 0.355
2007- 8-12 6.80 0.355
2007- 8-12 22.15 0.355
2007- 8-13 13.50 0.355
2007- 8-14 4.85 0.355
2007- 8-14 20.20 0.355

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8- 8 0.94 0.720
2007- 8- 8 16.29 0.720
2007- 8- 9 7.64 0.720
2007- 8- 9 22.99 0.720
2007- 8-10 14.34 0.720
2007- 8-11 5.69 0.720
2007- 8-11 21.04 0.720
2007- 8-12 12.39 0.720
2007- 8-13 3.74 0.720
2007- 8-13 19.09 0.720
2007- 8-14 10.44 0.720
2007- 8-15 1.79 0.720

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8- 8 3.01 0.855
2007- 8- 8 18.36 0.855
2007- 8- 9 9.71 0.855
2007- 8-10 1.06 0.855
2007- 8-10 16.41 0.855
2007- 8-11 7.76 0.855
2007- 8-11 23.11 0.855
2007- 8-12 14.46 0.855
2007- 8-13 5.81 0.855
2007- 8-13 21.16 0.855
2007- 8-14 12.51 0.855
2007- 8-15 3.86 0.855

Cheers, Petr [2007-08-07 09:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 22:57 UT on Aug.6, 2007.

Stefan [2007-08-07 01:30, Modra]

· Doing another run tonight on this interesting target. Will be starting at 04:30 UT.
Don [2007-08-06 01:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Although "officially" not a survey target, I've done two sessions on it so far, and may have detected one or two deep events. I'm doing a third run tonight starting at 04:25 UT. Perhaps a site west of Rhode Island could pick it up and help characterize the system while it's still observable?
Don [2007-08-05 01:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(1418) Fayeta (Finished) [Add new note]
· This slow rotator has been done sufficiently by David from Hunters Hill. It is closed for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-09-24 14:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-22 from 10:20UT to 17:15UT in fair conditions. New data fits existing curve refining the period to 63.641 +/- 0.016hrs with an amplitude of 0.24 +/- 0.01mag [2007-09-23 02:30, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-21 from 10:29UT to 17:54UT in good conditions. New data fills in a large gap and is in agreement with the previous 63.62hr period assessment. [2007-09-22 03:22, HuntersHill]

· Observed 2007-09-20 from 11:06UT to 17:55UT in good conditions after a rain front passed. Found a good period fit of 63.62 +/- 0.02 hrs after removing data taken on 12/09. (That data appears to show the comp stars were not exactly linear - but further analysis will be required.) The data also fit very well with a monomodal period of 31.82 +/- 0.02mag. [2007-09-21 01:40, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-18 from 09:43UT to 18:09UT in good conditions. Still no closer to a solution. [2007-09-18 23:57, HuntersHill]

· Observed 2007-09-12 from 10:38UT to 18:11UT in good conditions. Still can't resolve a definitive period but a fit at around 98hrs seems plausible. Data sent to Petr and Peter. [2007-09-12 23:18, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-09 from 10:51UT to 17:42UT in good conditions. Data is still indicating a potentially very long period (>32hrs) [2007-09-10 01:18, HuntersHill]

· Observed 2007-09-01 from 15:24UT to 19:27UT in good conditions. No closer to a solution though the solution appears >30hrs. [2007-09-02 02:57, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-25 from 11:48UT to 19:06UT in average conditions. This session showed a continuous decline in magnitude of ~0.15 +/- 0.01 mag. Indications are the target has a period > 24hrs. [2007-08-26 03:06, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-23 from 13:48UT to 19:55UT in reasonable conditions. The target lightcurve revealed a flat line with undulations of amplitude 0.02 +/- 0.01mag. [2007-08-23 21:16, HuntersHill]

1739 Meyermann (Finished) [Add new note]
· Vishnu and Ron have done this one from Badlands on three nights during Sept. 16-22: Unique solution, no significant deviation,
http://www.asu.cas.cz/~asteroid/01739.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Vishnu and Ron.

Cheers, Petr [2007-09-24 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting run at 3:30 UT. Should get some good data. High winds last night (50 mph) Vishnu and Ron [2007-09-22 03:28, Vishnu Reddy/Tucson]

· Started run around 3 UT. Should get 6 hours of data if weather holds. Vishnu and Ron [2007-09-21 04:15, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Started Run 3 UT. Should get 6 hours of data if weather hold. Vishnu & Ron [2007-09-16 03:40, Vishnu Reddy/Tucson]

(68220) 2001CT38 (Finished) [Add new note]
· This one has been worked by Don on 10 nights. There is a weak variation (amplitude only ~0.04 mag) with a period of 6 or 8 hours or commensurate (a full resolution would require accurate long data from more than one continent),
http://www.asu.cas.cz/~asteroid/68220.png
There are additional low-amplitude variations on some nights, but no consistent solution for them.

Petr [2007-09-21 13:25, Ondrejov]

· I started this at 00:27 UT.
Don [2007-09-19 00:27, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 00:15 UT.
Don [2007-09-18 03:10, CarbuncleHill]

· Started this along with 16635 at 00:30 UT.
Don [2007-09-17 02:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting a run on this, apparently, two-period object at 00:40 UT.
Don [2007-09-16 00:25, CarbuncleHill]

· Began a run at 00:40 UT.
Don [2007-09-14 00:48, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started a run at 00:40 UT.
Don [2007-09-13 00:46, CarbuncleHill]

· Started this one at 01:40 UT.
Don [2007-09-08 02:08, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started a run on this at 01:40 UT.
Don [2007-09-07 02:27, CarbuncleHill]

· I'll be starting this one tonight at 03:30 UT.
Don [2007-08-15 02:54, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(32008) 2000 HM53 (Finished) [Add new note]
· The announcement has appeared on CBET 1078, copied below for your convenience. I'm going to put it to the web sites.

Cheers, Petr

(32008) 2000 HM53
P. Pravec, P. Kusnirak, and K. Hornoch, Ondrejov Observatory; J.
Vilagi, L. Kornos, and A. Galad, Modra Observatory; D. Higgins, Canberra,
Australia; V. Chiorny, Institute of Astronomy, Kharkiv National University,
National Academy of Science of Ukraine; D. Pray, Carbuncle Hill Observatory,
Greene, RI; R. Stephens, Goat Mountain Astronomical Research Station, Yucca
Valley, CA; V. Reddy, Department of Earth System Science and Policy,
University of North Dakota, Grand Forks; and R. Dyvig, Quinn, SD, report
that photometric observations obtained during Aug. 5-Sept. 14 reveal that
minor planet (32008) is a binary system with an orbital period of 40.24 ±
0.02 hr -- or, less likely, 20.12 ± 0.01 hr. The primary shows a period
of 3.0171 ± 0.0001 hr, and it has a lightcurve amplitude of 0.19 mag.
Mutual eclipse/occultation events indicate a lower limit on the secondary-
to-primary mean-diameter ratio of 0.4. Calibrated data give an estimated
mean absolute magnitude H_R = 14.17 ± 0.1, assuming G = 0.15 ± 0.2.

(C) Copyright 2007 CBAT
2007 September 20 (CBET 1078) Daniel W. E. Green [2007-09-20 12:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vasilij has covered most of the 0.25-phase event on 2007-09-11.8. So, the last data we were waiting for have been already taken.
http://www.asu.cas.cz/~asteroid/32008_longpc.png
Adrian will check a few points in the August 15.0 Modra session that are critical for D_2/D_1 estimation on Monday, and then we will publish this one on a circular right away.

Nice work all on this unusual one!

Cheers, Petr [2007-09-14 08:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run at 3 UT. Should get about 4 hours of data before the object gets too low to observe. Vishnu & Ron. [2007-09-14 03:22, Vishnu Reddy/Tucson]

· New data joined in:
2007-09-05.9 by Vasilij from Kharkiv (2.0h)
2007-09-07.1 by Don from Carbuncle Hill (2.9h)
2007-09-09.5 and 12.5 by David from Hunters Hill (7.6h and 6.8h)
David has covered the 0.75-phase event well on the last night. The event is shallow now but it is still there. The ambiguity 20 vs 40 h in P_orb is resolved now: P_orb = 40.24 +/- 0.02 h. A lower limit on D_2/D_1 is 0.5 (We cannot nail it down with the available data as we didn't get a thorough enough coverage when the events were most central around mid-August.)
http://www.asu.cas.cz/~asteroid/32008_longpc.png

One more coverage of the 0.25-phase event would be good before we publish an announcement on the binary on a circular; ephemeris is below. Adrian will also check a few points in the August 15.0 Modra session that are critical for D_2/D_1 estimation.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9-13 10.59 0.255
2007- 9-15 2.83 0.255
2007- 9-16 19.07 0.255
2007- 9-18 11.31 0.255
2007- 9-20 3.55 0.255

Cheers, Petr [2007-09-13 09:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-12 from 09:24UT to 16:13UT in reasonable conditions (first couple of hours was quite windy) and some star subtractions. Data sent to Petr. [2007-09-12 23:14, HuntersHill]

· Observed 2007-09-09 from 08:44UT to 16:19UT in good conditions. Better quality data that previously obtained though still near the BINAST limit. Data sent to Petr. [2007-09-09 22:33, HuntersHill] Message sent to BinAstPhotSurvey conference

· I thought I could work this. Another night lost to late building thunderstorms. [2007-09-09 01:04, PalmerDivide]

· I started this at about 00:45 UT, Sep 7. If the P_orb is 40h, then I'll see no event at 3.96 UT. The sky clouded over once, already, so, hopefully, that won't happen again.
Don [2007-09-07 02:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don has covered a critical time on September 2, saw no event. So, either the system's P_orb is 40.26 h, or the events have already disappeared (see comments below on an unusually rapid evolution of events in the system).
Current solution:
P_1 = 3.0170 +/- 0.0001 h
A_1 = 0.19 mag
P_orb = 40.26 +/- 0.02 h or 20.13 +/- 0.01 h
Depth of events 0.07-0.29 mag
D_2/D_1 >= 0.5
H_R = 14.17 +/- 0.1 (assuming G=0.15 +/-0.2)
http://www.asu.cas.cz/~asteroid/32008_all.png
http://www.asu.cas.cz/~asteroid/32008_longpc.png
http://www.asu.cas.cz/~asteroid/32008_shortpc.png
The system is showing an unusually rapid evolution of events. They were deepest on August 16, and they appeared much more shallow on August 29 and September 2. One more good coverage for each of the two events, before we publish an announcement on this one and turn our effort fully to the other needed targets, would be good to see how the events have evolved most recently and whether they haven't already completely disappeared . An ephemeris for the events is below. Note also that the satellite is relatively large for an asynchronous binary, that is also an interesting characteristic. So, the system appears to be unusual and challenging. We will see what it reveals to us in future when we get more data and modeling.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9- 6 18.03 0.260
2007- 9- 8 10.29 0.260
2007- 9-10 2.55 0.260
2007- 9-11 18.81 0.260
2007- 9-13 11.07 0.260
2007- 9-15 3.33 0.260

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9- 5 21.49 0.750
2007- 9- 7 13.75 0.750
2007- 9- 9 6.01 0.750
2007- 9-10 22.27 0.750
2007- 9-12 14.53 0.750
2007- 9-14 6.79 0.750
2007- 9-15 23.05 0.750

Cheers, Petr [2007-09-05 10:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Ok, it looks that so far we had not got a luck with covering key phases to resolve the 20 vs 40 h ambiguity in Porb for this one. Here is an extended events ephemeris for the 20.13h candidate period. Observations around times in the second table will be most constraining to remove the ambiguity; if events occur there, it is 20.13h, if they don't occur, it is 40.26h.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9- 5 1.65 0.250
2007- 9- 5 21.78 0.250
2007- 9- 6 17.91 0.250
2007- 9- 7 14.04 0.250
2007- 9- 8 10.17 0.250
2007- 9- 9 6.30 0.250
2007- 9-10 2.43 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007- 9- 5 11.70 0.750
2007- 9- 6 7.83 0.750
2007- 9- 7 3.96 0.750
2007- 9- 8 0.09 0.750
2007- 9- 8 20.22 0.750
2007- 9- 9 16.35 0.750
2007- 9-10 12.48 0.750

On Sept 5, there is an opportunity for David to cover the phase of 0.75. On September 6 and 7, the phase moves to America. Guys, do some of you see it likely that you will be able to cover it on some of the next few nights? If no one sees it likely to cover it, I might ask Marc Buie who has offered to help us with their 0.8m telescope at Lowell with critical targets; I would write to him tomorrow. If we don't succeed to cover the critical phases before Sept 8, then the window moves to Europe again so we may cover it from here if weather improves as expected.

Clear Skies,

Petr [2007-09-04 14:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-09-02 from 08:50UT to 15:46UT in reasonable conditions. Data sent to Petr. [2007-09-03 09:10, HuntersHill]

· Observed 2007-09-01 from 08:44UT to 16:45UT in good conditions. [2007-09-02 03:33, HuntersHill] Message sent to BinAstPhotSurvey conference

· I started this at 00:30 UT to determine if there is an event at 03.18.
Don [2007-09-02 00:27, CarbuncleHill]

· Observed 2007-08-29 from 08:49UT to 16:09UT in moon affected conditions. Data sent to Petr. [2007-08-30 06:52, HuntersHill] Message sent to BinAstPhotSurvey conference

· Enclosed below is a prediction for events for the 20.13-h candidate Porb solution. If it is 40.26h rather than 20.13h, then only events listed in the first of the two tables below will occur. So, observations around times in the second table will be most constraining to remove the ambiguity; if events occur there, it is 20.13h, if they don't occur, it is 40.26h.

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8-31 0.87 0.250
2007- 8-31 21.00 0.250
2007- 9- 1 17.13 0.250
2007- 9- 2 13.26 0.250
2007- 9- 3 9.39 0.250
2007- 9- 4 5.52 0.250
2007- 9- 5 1.65 0.250
2007- 9- 5 21.78 0.250

Date/Time UTC (LTc.) Phase
--------------------------
2007- 8-31 10.92 0.750
2007- 9- 1 7.05 0.750
2007- 9- 2 3.18 0.750
2007- 9- 2 23.31 0.750
2007- 9- 3 19.44 0.750
2007- 9- 4 15.57 0.750
2007- 9- 5 11.70 0.750
2007- 9- 6 7.83 0.750

Clear Skies, Petr [2007-08-29 09:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Following data joined in since the last update I wrote before the workshop:
2007-08-17.9 by Kamil from here,
2007-08-18.3 by Bob from GMARS,
2007-08-22.9 and 24.0 by Adrian and Jozef from Modra,
2007-08-23.6 by David from Hunters Hill.
Bob has caught a part of an event, other data covered orbital phases outside events. The short period is refined to 3.0169 +/- 0.0001 h, but for the long period, the ambiguity 20.13 h vs. 40.26 h still remains. The 20.13-h period looks more likely, but it needs to be resolved with more data after the Moon is away to establish the binary well.
In the first two of following plots, the data are folded with the 20.13-h candidate period:
http://www.asu.cas.cz/~asteroid/32008_all.png
http://www.asu.cas.cz/~asteroid/32008_longpc.png
http://www.asu.cas.cz/~asteroid/32008_shortpc.png

Cheers, Petr [2007-08-27 11:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-08-23 from 13:36UT to 17:25UT in reasonable conditions (last 1/2 of the session only due to cloudy conditions). Data sent to Peter K for analysis. [2007-08-24 02:08, HuntersHill]

· We are still in business tonight, somehow. observing from 22:50 UT, expecting 2 hours of data. Adrian and Jozef [2007-08-23 23:24, Modra] Message sent to BinAstPhotSurvey conference

· We would like to add some observation tonight - but clouds are approaching. In any case it is probably our last night before dome reconstruction :-( Adrian and Jozef [2007-08-22 20:36, Modra]

· Caught what appears to be an event last night. Will send data to Petr and Peter.

Bob Stephens [2007-08-18 15:44, Santana] Message sent to BinAstPhotSurvey conference

· Will try observing from GMARS tonight. [2007-08-18 03:32, Santana]

· I will try to observe this one tonight if weather permit. Best wishes, Kamil [2007-08-17 17:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two new long nights by Jozef and Leos from Modra of 2007-08-15.0 and 16.0. They caught two events, one of them fully and the other one partially covered. A unique solution for the short period: P_1 = 3.0165 +/-0.0002 h. A solution for the orbital period needs to be nailed down with more data, but a period of 40.2 h or 20.1 h appears likely. In the first two of following plots, the data are folded with the 40.2-h candidate period:
http://www.asu.cas.cz/~asteroid/32008_all.png
http://www.asu.cas.cz/~asteroid/32008_longpc.png
http://www.asu.cas.cz/~asteroid/32008_shortpc.png
D_2/D_1 appears to be at least 0.4. We will see how it is nailed down with more data. More observations at any time are needed (see also the sparsely covered long period in the plot above).

Cheers, Petr [2007-08-17 14:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Five nights (but all relatively short, 2-3 h) have been taken for this one:
2007-08-05.0, 6.0, 7.0, and 14.9 by Peter K. and Kamil from here,
2007-08-14.0 by Leos and Juraj from Modra.
The relatively short durations of the sessions hampered us to get a solution from first few nights, but now I am coming to a solution: There is a short period of 3.0168 h (U=2+ or 3-; needs to be nailed down with one more long night, preferrably from outside Europe), and with an attenuation on the first night, see following plots:
http://www.asu.cas.cz/~asteroid/32008.png
http://www.asu.cas.cz/~asteroid/32008_070805_ondrejov.png
Ok, more data are needed, to nail down the main period, to catch more events and to estimate their period. I would like to ask you to help out. Kamil should take more data tonight and on the Fri/Sat night, but then he as well as Peter K. will be away (I will be attending the workshop on binaries that will be held in Colorado in the next week), so other stations are encouraged to take over. Btw, the relatively long time we needed to get to a solution (11 days since the first night) points out the need to take longer sessions as well as the need to ask other stations to help out with an unclear case, especially when there occurs a break in the observing run, like we got between Aug. 7 and 14. Don't hesitate to ask others for a help with an unclear case sooner rather than later.

Cheers, Petr [2007-08-16 14:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I will be observing (32008), up to 22:30 UT. Best wishes, Kamil [2007-08-14 21:29, Ondrejov]

· Observing from 23 UT. Peter K. [2007-08-05 23:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 2.4 hour last night. Seems to be a short-period and low-amplitude object. Peter K. [2007-08-05 09:00, Ondrejov]

(9120) 1998DR8 (Finished) [Add new note]
· Don has done the P=14.75h target well from Carbuncle Hill,
http://www.asu.cas.cz/~asteroid/09120.png
It is finished,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2007-09-14 10:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Last, but not least, started a run on this at 02:20 UT.
Don [2007-09-14 02:27, CarbuncleHill]

· Doing a run on this one, hopefully to finish it.
Don [2007-09-13 01:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don,

Yes, it is a U=2 solution with period of 14.750 +/-0.002 h, but a period of 21.81 h is possible as well. One or two more sessions during following nights, either from your, or even better, from a station on a differnt continent, may resolve the ambiguity and then the target can be closed right away. Well, given that other collaborative targets have a higher priority, you will probably have to take the additional session(s) by yourself. But you wrote that weather forecast for your station is poor for this week. Well ....

Clear Skies, Petr [2007-09-10 08:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run around 01:20 UT.
Don [2007-09-08 02:04, CarbuncleHill]

· I started a third run on this slow rotator at 02:10 UT.
Don [2007-08-15 02:51, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3936) Elst (Finished) [Add new note]
· This one has been done with four 3-4h long sessions from S. Pleso (plus three shorter ones that were of limited use), and with one 6h-long session from Badlands:
http://www.asu.cas.cz/~asteroid/03936.png
It is done for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

So, the one of our current long-standing targets has been finished finally :-)

Cheers, Petr [2007-09-12 07:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this target at 3 UT. Conditions excellent,should get in a long run.

Ron & Vishnu [2007-09-11 03:07, Vishnu Reddy/Tucson]

· Started run at 5 UT. Should get 5 hours worth of data. Hope our friends at SkalnatePleso don't mind our help with this target. Vishnu and Ron [2007-09-06 04:37, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Observing from 20:15 UT in good conditions. Michal [2007-09-02 20:17, SkalnatePleso] [Remove]

· Observing from 20:15 UT in average conditions. Michal [2007-09-01 20:15, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This one shows 6.633 h period with 0.13 mag amplitude. It needs to cover double about 40% of lightcurve or it would be best to take full phase. We still caught the same parts of the phase and once full phase.
Marek [2007-08-26 20:47, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This object observed from 19:57 UT to 02:10 UT, August 25/26. Gabo [2007-08-26 02:27, SkalnatePleso] [Remove]

· This object observed from 21:10 UT to 01:58 UT, August 16/17. Gabo [2007-08-17 02:07, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This object observed from 19:30 UT to 02:00 UT, August 15/16. Gabo [2007-08-16 02:06, SkalnatePleso] [Remove]

· This object observed from 22:23 UT to 02:08 UT, August 14/15. Gabo [2007-08-15 02:14, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 20:30 UT in variable sky quality conditions at the moment. Michal [2007-08-11 20:37, SkalnatePleso] [Remove]

· Observing from 00:30 UT in good conditions. Michal [2007-08-11 01:00, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 21:45 UT in good conditions. Michal [2007-08-09 23:59, SkalnatePleso] [Remove]

(3722) Urata (Finished) [Add new note]
· Closing it here as the data by Bob and Don were sufficient. Gianluca, I'll add your additional data when you send me them. Petr [2007-08-28 13:34, Ondrejov]

· Hi,

started at 21UT. I will follow it all night. So far two hours of data, showing nearly two maxima, with an amplitude of 0.5 mag.

Kind regards,
Gianluca Masi [2007-08-14 23:09, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· Three good long nights, two by Bob from GMARS and one by Don from Carbuncle Hill (plus one additional shorter session in less good conditions by Don) have done this one well:
http://www.asu.cas.cz/~asteroid/03722.png
It is finished for the BinAstPhotSurvey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Bob and Don.

Cheers, Petr [2007-08-06 09:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a second night at GMARS with a complete period. Data send to Petr and Peter. Period of 5.57 hours is unique with no deviations. [2007-08-05 19:49, Santana]

· Doing a second night on this one (first night was Aug 3 in only fair conditions).
Don [2007-08-05 01:22, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Obtained a bit more than a complete rotation last night. The period appears to be about 5.63 hours with an amplitude of 0.6 magnitudes. Nothing unusual in the lightcurve. I should be able to wrap it up in a night or two. [2007-08-04 15:54, Santana] Message sent to BinAstPhotSurvey conference

· Started observing 6 hours UT from GMARS. [2007-08-04 06:02, Santana]

(5615) Iskander (Finished) [Add new note]
· This one has been done by Don from Carbuncle Hill: unique period, sufficient coverage, no significant deviation seen. It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-08-13 08:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 02:45 UT.
Don [2007-08-09 01:59, CarbuncleHill]

· Doing a run on this tonight.
Don [2007-08-06 02:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing a second night one this. On Aug 3, conditions led to poor results, but I can see it's a very high amplitude object.
Don [2007-08-05 01:26, CarbuncleHill]

(10497) 1986 RQ (Finished) [Add new note]
· Michal and Marek have done this one sufficiently from S. Pleso during 2007-08-06.9 to 9.0:
http://www.asu.cas.cz/~asteroid/10497.png
It is finished for the Survey,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-08-09 08:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21:30 UT, new cam testing. Michal [2007-08-08 22:13, SkalnatePleso] [Remove]

· Observing from 20:45 UT in underaverage sky condtions at the moment. Michal [2007-08-07 21:14, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· More than 2h run shows no nice deviations in LC. Very low amplitude like in the case of finished (14868) 1990 RA7. [2007-08-07 07:07, SkalnatePleso] [Remove]

· Observing from 21:35 UT. Cirrus degrades the sky quality a bit. Michal [2007-08-06 21:37, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(7832) 1993 FA27 (Finished) [Add new note]
· Four+one night by David+Michal give a U=2 solution of P=8.31 h, A=0.03 mag. Petr [2007-08-02 13:26, Ondrejov]

· Observing from 19:30 UT in good conditions. Michal [2007-07-26 19:46, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observed 2007-07-20 from 10:35UT to 18:52UT in good conditions. Period seems to be extending after each night. Todays solution shows 8.3 hrs. Data sent to Peter. I'm going to call this one done unless Peter identifies that it is worthwhile pursuing. [2007-07-21 06:44, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-18 from 10:35UT to 19:03UT in average conditions. The data is still low amplitude and relatively noisy given the 0.005mag error bars and the best fit to date is 10.67 +/- 0.02hrs with an amplitude of around 0.05mag. [2007-07-18 22:55, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-15 from 10:52UT to 17:05UT in increasingly foggy conditions. Plot is still very flat with an amplitude of ~0.02mag +/- 0.01mag. Some periodicy is apparent with a possible period at 7.61 +/- 0.02hrs. [2007-07-16 07:45, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-10 from 13:28UT to 19:31UT in good conditions. Some interference from bright stars (data points deleted) and the plot shows a pretty flat line with possible periodicy (but with an amplitude ~ 0.02 +/- 0.01mag. [2007-07-10 22:47, HuntersHill] Message sent to BinAstPhotSurvey conference

(3163) Randi (Finished) [Add new note]
· David has done this one well (P=60.0 h, U=3) from Hunters Hill. Closed for the Survey, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well established slow rotator, David.

Cheers, Petr [2007-08-01 12:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-22 from 13:06UT to 19:40UT in good conditions. Period refined to 59.93 +/- 0.02mag with more than 50% coverage and double coverage on part. I believe this is a pretty solid 2 and done for the survey though I will continue to refine the period. [2007-07-23 00:04, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-20 13:36UT to 19:32UT in good conditions. First obvious overlap in plot and a good monomodal fit presents a period of 59.93 +/- 0.02 hrs though there is still too much of the plot uncovered to give such an error margin. Amplitude appears around 1.2 +/- 0.01mag [2007-07-21 03:39, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-15 and 2007-07-18 in reasonable conditions. Target still appears to be a long period rotator with a fit at 61.5 +/- 0.2hrs and an amplitude of ~1mag but less than 1/2 the period has been covered. (Taking points at approx hourly intervals for this one) [2007-07-18 22:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-10-11 13:25 to 18:59 is reasonable conditions. Period confirmed to be very long with tonights observations recording the later part of a minima. [2007-07-11 22:22, HuntersHill]

· Observed 2007-07-10 from 13:44UT to 19:43UT in good conditions. This target appears to have a period > 48 hrs with an amplitude > 1.6mag The data shows the part of a curve leading to a maxima. [2007-07-10 22:30, HuntersHill] Message sent to BinAstPhotSurvey conference

(66335) 1999 JZ61 (Finished) [Add new note]
· This target was observed on 8 nights from CarbuncleHill (5), Ondrejov (2) and HuntersHill (1). Its period of 12.97 h is unigue now and coverage is sufficient for targets with P>10 h.

http://www.asu.cas.cz/~asteroid/66335.png

It's finished now. Nice work guys.

Peter K. [2007-07-26 08:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Trying a run on this tonight.
Don [2007-07-22 03:04, CarbuncleHill]

· Don+David's data show a period of ~12.97 h:
http://www.asu.cas.cz/~asteroid/66335.png
One more night could nail down this one entirely.

Cheers, Petr [2007-07-12 08:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-11 from 13:19UT to 19:15UT in reasonable conditions. Data reveals a potential monomodal fit at ~6.3hrs with an amplitude of ~0.3 +/- 0.01mag. [2007-07-11 22:33, HuntersHill]

· Don's data for this one show an increasing branch and a maximum on each of his four nights, that indicates a period near commensurability with 1 day. Candidate periods are near 9.6, 12, 16, and 24 h. Data folded with the ~16-h candidate period see
http://www.asu.cas.cz/~asteroid/66335.png
To nail it down, we need a couple nights from Europe and/or Australia. Don might appreciate to be assisted also with an US station, see his message:
"I'll probably only have Thursday night to observe it again, and then I'll be gone until July 22."
Don has also noted:
"Again, this one is in a crowded star field so the data isn't as clean as it might be."
so work it only if you can handle it reasonably.

Clear Skies, Petr [2007-07-11 12:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· If the clouds off, I'll be doing this tonight.
Don [2007-07-10 03:36, CarbuncleHill]

· The first night didn't tell me much. I'll be doing it again tonight.
Don [2007-06-25 22:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(14868) 1990 RA7 (Finished) [Add new note]
· Closing this unsuccessfull one. [2007-07-17 11:43, Ondrejov]

· Observing from 20:55 UT in good conditions. Michal [2007-06-12 21:00, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· David's data show that it is a low amplitude or long period, but they cannot resolve it. The observations are not sufficient for the target to be included into the Survey's sample. A few accurately linked nights (with linking errors of 0.01 mag) could resolve it, if there is someone able to take them.

Petr [2007-06-11 11:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-06-10 from 10:09UT to 17:51UT in average conditions. Data still very low amplitude and object is fainter than anticipated. Best period is 9.78hrs but not certain. Data sent to Petr. [2007-06-11 10:02, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-06-06 from 10:14UT to 18:14UT in good conditions. Error bars are +/- 0.03 and the amplitude is still around 0.1mag or less making it difficult to resolve a period. Now possibly something around 10 hrs with a few 'bad' points. [2007-06-06 23:11, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007-06-05 from 12:09UT to 15:02 in poor conditions. Heavy cloud delayed the session and heavy cloud ended the session. Noisy data reveals a possible period of around 2.2 hrs with an amplitude of around 0.1 +/- 0.03mag but too early to tell. [2007-06-05 22:58, HuntersHill] Message sent to BinAstPhotSurvey conference

(16698) 1995 CX (Finished) [Add new note]
· Closing this unsuccessfull one for the survey. [2007-07-17 09:58, Ondrejov]

· Data for this one obtained so far by Don from Carbuncle Hill (5 nights), by David from Hunters Hill (2 long nights), by Francois from PdM (1 night), by Vishnu and Ron from Badlands (1 night), and by Peter K. here (1 short session) don't fit together. Some sessions show no variation greater than a few 0.01 mag, but other show local peaks. Following plot where the data are folded with 12-h period just for purpose of illustration, shows the different behaviors in different sessions:
http://www.asu.cas.cz/~asteroid/16698.png
Considering the very crowded star field, I suspect that the local peaks may be due to faint background stars that are not corrected well (or at all). Since the asteroid will stay at low galactic latitudes also during following days, I don't encourage to take more data. Only reliable data are needed, and such are difficult to take for the targets for most stations. Don (and all), when you select a target yourself, remember to check galactic latitude - targets within 20 deg from the galactic equator around June-July opposition have mostly too crowded fields for many stations to work well, and I don't propose such in my target lists.

Petr [2007-06-24 10:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2007-06-23 09:37UT to 18:01UT in good conditions. Data still noisy and a few subtractions required. Data indicates an 0.08mag amplitude with no solid data fit. Data sent to Petr. [2007-06-24 09:08, HuntersHill] Message sent to BinAstPhotSurvey conference

· Due to an equipment problem, I started this at 03:15 UT.
Don [2007-06-24 03:22, CarbuncleHill]

· Going to start run at 4 UT. Should get good data till ~9UT if the weather holds. Vishnu and Ron [2007-06-23 03:45, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Started at 02:15 UT. Hopefully, it will stay clear.
Don [2007-06-23 02:17, CarbuncleHill]

· Observed from 2007-06-22 09:14UT to 18:07UT in good conditions. Target located in a fairly crowded field requiring 6 star subtractions and resulting in some noisy data. With 2 intermediate humps, the data appeared to indicate a slow decline in brightness over the entire session though it may also indicate a period around 9.2hrs in length. [2007-06-22 21:46, HuntersHill] Message sent to BinAstPhotSurvey conference

· I've added the target to my observing list for tonight. Should start observing at ~10:00UT for a 7-8hr session. [2007-06-22 08:52, HuntersHill]

· Don has picked up a new target 16698, his first two nights suggest a period around 2.3 h (not unique), and there is a decrease in the second night that may be an event, see
http://www.asu.cas.cz/~asteroid/16698.png
http://www.asu.cas.cz/~asteroid/16698_070621_carbunclehill.png
Collaborative work from a few stations is encouraged to establish the main period well, to confirm the event, and to find its period.

Cheers, Petr [2007-06-22 08:06, Ondrejov] Message sent to BinAstPhotSurvey conference

(5477) 1989 UH2 (Finished) [Add new note]
· Julian's three nights of July 6, 11, and 12 have covered the secondary event. Plots of the May-June and the July data:
http://www.asu.cas.cz/~asteroid/5477_a7_all.png
http://www.asu.cas.cz/~asteroid/5477_a7_longpc.png
http://www.asu.cas.cz/~asteroid/5477_a7_shortpc.png
http://www.asu.cas.cz/~asteroid/5477_a7jul_all.png
http://www.asu.cas.cz/~asteroid/5477_a7jul_longpc.png
http://www.asu.cas.cz/~asteroid/5477_a7jul_shortpc.png
Estimated main parameters:
P_1 = 2.9940 +/-0.0002 h
A_1 = 0.12 +/-0.01 mag
P_orb = 24.43 +/- 0.02 h
Secondary's rotations appears synchronized with the orbital motion,
A2 = 0.05 +/-0.01 mag.

The estimates are in a perfect agreement with data obtained in the discovery apparition of 2005Nov-Dec:
P_1 = 2.9941 +/-0.0002 h
A_1 = 0.11 +/-0.01 mag
P_orb = 24.42 +/- 0.02 h
A2 = 0.04 +/-0.01 mag.

A corrected amplitude of the secondary (extracting a light from the primary) is 0.3 mag, so the secdondary is moderately elongated with estimated axial ratio
(a/b)_2 = 1.3 +/-0.1.

Events in both apparitions appeared total or very nearly so. Size ratio estimates from the two apparitions:
D_2/D_1 (2005) = 0.37 +/-0.02
D_2/D_1 (2007) = 0.43 +/-0.02
differ slightly. It is not clear now what the small but non-negligible difference means, more data will reveal it in future. For now, I adopt
D_2/D_1 = 0.40 +/-0.04.

A combination of the data from the two apparitions will constrain an orientation of the orbital plane. Since the observations in the two apparitions were taken in positions about 166 deg distant in the sky, a third apparition taken in a rather different geometry will be needed to establish the orbit's orientation well. Next apparition will occur during 2008Dec-2009Feb when the asteroid will be around RA=8.6 h and Dec=+58 deg and at V~17.5, so observations with a 1-m telescope in a northern hemisphere station will be needed. We will look for it.

Cheers, Petr Pravec [2007-07-16 09:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started from 09:29UT to 14:38UT 07/12. Part of secondary event captured near the end. This will be my last night on this target for this lunation. Data sent in. [2007-07-13 04:19, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started from 10:33UT to 15:13UT 07/11. part of the event captured. Data sent in. [2007-07-12 07:38, Blue Mountains Obs]

· observe from 09:53 to 14:33UT . Secondary event captured. Will attempt another session tonight . [2007-07-07 05:46, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Julian, your three sessions have covered the primary event; the attribution of it to be primary and not secondary event is based on that it is significantly deeper than a total secondary event could be for the binary, and it is supported also by a characteristic shape of the event in the minimum.
http://www.asu.cas.cz/~asteroid/5477_a7_all.png
http://www.asu.cas.cz/~asteroid/5477_a7_longpc.png
http://www.asu.cas.cz/~asteroid/5477_a7_longpc_a.png
http://www.asu.cas.cz/~asteroid/5477_a7_shortpc.png
The event has been covered well, no more data are needed now or during next few days. Secondary events will occur within your nightly observing window during June 26-July 15, so please take a couple good long sessions during the time interval (best after the Moon doesn't disturb after the June 30 Full Moon). Primary events will move out of your observing window on June 19, and since it is not likely that more data for the primary event taken during the five days between now and June 19 would bring a much useful information, I think you may consider the target as done for this lunation and resume its observations after the Full Moon in early July for the secondary events.

Very nice work on the return binary so far!

Cheers, Petr [2007-06-13 09:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· I did about 9 hours last night starting from 07:50 UT under good condition, 3-4 background stars successfully eliminated with SBG. Petr, Could you please tell me what my strategy for 5477 now that I have captured 3 events daily. Should I pause for a week or two before I start again? If porb is 12 hours, then I would think that the secondary event will be around 20h UT now. If that’s the case than I will be able to capture both events in a single night around 7-8 days from today. [2007-06-13 02:18, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I am doing this one again tonight started at 09:00UT. Hope the weather will hold. Planning for a long session. [2007-06-11 11:26, Blue Mountains Obs]

· So, the events were indeed "hidding" in the gap in coverage in the May data. Julian has covered the gap on the last night and he revealed an event there:
http://www.asu.cas.cz/~asteroid/5477_a7_all.png
http://www.asu.cas.cz/~asteroid/5477_a7_longpc.png
http://www.asu.cas.cz/~asteroid/5477_a7_longpc_a.png
http://www.asu.cas.cz/~asteroid/5477_a7_shortpc.png
A second night would be good to describe the event's shape well so that it can be best modeled.

Cheers, Petr [2007-06-11 10:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations were done from 13:16UT to 17:13UT June3 in excellent condition. No events noted. Data sent in. [2007-06-04 12:47, Blue Mountains Obs]

· Long sessions for the return binary have been taken by Julian from Leura on May 26.6 and 27.6 and by David from Hunters Hill on May 26.6. Fixing the periods at the values we measured in 2005, I have got following solution:
http://www.asu.cas.cz/~asteroid/5477_a7_all.png
http://www.asu.cas.cz/~asteroid/5477_a7_longpc.png
http://www.asu.cas.cz/~asteroid/5477_a7_longpc_a.png
http://www.asu.cas.cz/~asteroid/5477_a7_shortpc.png
(Note that in the first two pictures above, the data are plotted with Porb/2.)
Amplitudes of both rotational lightcurve components are very close to that we saw in Nov-Dec 2005, see
http://www.asu.cas.cz/~ppravec/5477_longpc.png
http://www.asu.cas.cz/~ppravec/5477_shortpc.png
There occur no events above the Survey's detection limit in the covered part of the orbital period now. The coverage needs to be completed with a couple long sessions after the Full Moon. A following ephemeris for times of the center of the gap (in Porb/2) occuring for the Australian station is basically for Julian and David's curiosity only; in practice, it is simply needed to take two full nights in good conditions on any nights after the full Moon.

Date/Time UTC (LTc.)
--------------------
2007- 6- 4 10.83
2007- 6- 5 11.25
2007- 6- 6 11.68
2007- 6- 7 12.10
2007- 6- 8 12.52
2007- 6- 9 12.95
2007- 6-10 13.37

If no event of a significant depth is seen after adding more data after the full moon, it will constraint orbit pole of the binary significantly.

Cheers, Petr [2007-05-28 15:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observation done from 10:00UT to 18:28 UT in good contition. Data sent in. [2007-05-28 10:12, Blue Mountains Obs]

· Observation done from 08:14UT to 18:10UT. Encountered about 4 nearly similar brightness stars and the corrupted data were deleted. No other faint background stars noted. Data sent in along with 2 short sessions from 16/05 and 25/05 [2007-05-27 10:35, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed from 2007-05-26 09:08UT to 18:04UT in good conditions. Data had somewhat higher errors than I would have liked but still might be useful. Somewhat confused curve at 2.98hrs. Data sent to Petr. [2007-05-27 04:33, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started observation on this return binary at about 11:00UT. Good weather if hold will expect 7h run. [2007-05-25 11:01, Blue Mountains Obs]

· Working 5477 from SRO tonight. The weather is not great so the data may not be of use.

-Walt [2005-12-09 03:22, Sonoita] Message sent to BinAstPhotSurvey conference

· I'll be trying this tonight if the wind allows it,

Don [2005-12-07 22:11, CarbuncleHill]

· Last night's run was not usable. Clouds, bad seeing, and the asteroid being too faint for the available telescope added up to errors too large to make the data usable. [2005-12-01 13:35, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Yesterday - 4-h session covering nearly the whole primary event.

Adrian [2005-12-01 11:20, Modra]

· Starting observations shortly (about 00:45 UT Dec. 1). Will go until morning twilight or snow starts, whichever comes first. [2005-12-01 00:16, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Starting second night here. Should get at least another 8 hours of data. First night data has been reduced. [2005-11-24 02:27, Vishnu Reddy/Tucson]

· Clear skies here at Badlands. Started observing run at 01:00 UT...should get at least 8 hours of data.
Ron and Vishnu [2005-11-23 03:49, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· So, and just now we ended our 3/4 hour lasting attempt.
A fog is getting up from Zochova chata valley, Petr
knows it (both, the valley and a fog :-)) Stefan/Jozef [2005-11-11 23:21, Modra]

· OK, conditions are better now, we started at 22:05 UT
with it. Stefan/Jozef [2005-11-11 22:09, Modra] Message sent to BinAstPhotSurvey conference

· Obtained data last night (11-11-2005). Data sent to Petr. I was following 3 targets with one scope - I think 2 should be the absolute maximum...... [2005-11-11 21:01, HuntersHill]

· I'll be trying this tonight, weather permitting.

Don [2005-11-10 22:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this one at 18:30 UT, expected coverage till 02:30 UT, if weather permits. [2005-11-09 18:47, Modra]

· Started a run on this target tonight (split scope operations between this target and 15350). [2005-11-09 10:41, HuntersHill] Message sent to BinAstPhotSurvey conference

· There are good indications that (5477) 1989 UH2 is a binary. This is based on three nights of observations from Palmer Divide. Here's Peters analysis

A single periodic lightcurve with P~12 h doesn't fit well, but as you note, we need more data to rule out it with full certainty.

A two-period model fits nicely with Pshort of 3.0 h and Plong either 16.25 or 24.4 h, see

http://www.asu.cas.cz/~ppravec/5477_longpc_16h.png
http://www.asu.cas.cz/~ppravec/5477_longpc_24h.png

The shapes of the minima fit nicely with a binary model with Ds/Dp~0.48 (a relatively large satellite). (A long period of 12.18 h appears less likely, but more data will be needed to rule out it with full certainty.)

Given the 16/24h secondary period, both commensurate with 24h, help is needed from Europe or Australia (if it's not too low, David).

Please send data directly to me and I will forward it to Petr after merging it with the data I'm getting.

Thanks for any help.

Brian [2005-11-04 17:07, PalmerDivide] Message sent to BinAstPhotSurvey conference

(96562) 1998 SZ138 (Finished) [Add new note]
· Last night's session by Don has completed this one: unique period, good coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/96562.png
It is finished, a note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

A somewhat less easy shape of its lightcurve could make this one a potentially tough target, but your good data have solved it well: So, Nice work, Don and David.

Cheers, Petr [2007-07-13 17:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be doing a (hopefully) final session on this tonight.
Don [2007-07-13 03:13, CarbuncleHill]

· Don+David's data give a unique solution of 2.5688 +/-0.0002 h:
http://www.asu.cas.cz/~asteroid/96562.png
No significant deviation seen in the available data, but one more good session covering at least one period well would be useful to improve coverage; some data are relatively short or have increased errors.

Cheers, Petr [2007-07-12 08:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-07-11 from 13:10UT to 19:05UT in reasonable conditions. Data indicates a period of 2.55 +/- 0.02 hrs with an amplitude of 0.2 +/- 0.01mag. Data sent to Petr. [2007-07-11 23:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· Don has found this one to be a fast rotator, a candidate period is 2.569 h,
http://www.asu.cas.cz/~asteroid/96562.png
Two consecutive nights (best if from different continents) could nail it down, so I encourage a station from Europe or Australia that is able to work the relatively faint object in slightly crowded field to help out.

Cheers, Petr [2007-07-11 12:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· If the clouds hold off, I'll be doing a run on this tonight.
Don [2007-07-10 03:35, CarbuncleHill]

· The first night on this looks like it could be a fast rotator (2-3h). I'll be doing a second run tonight, but starting late, since it rises at 04:45 ut.
Don [2007-06-25 22:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(30220) 2000 GP126 (Finished) [Add new note]
· Closing here the finished target. [2007-07-13 07:23, Ondrejov]

· Unique period found to be 3.3670 +/- 0.0003h. amplitude is 0.50 +/- 0.05mag. Multiple coverage of the light curve achieved. no significant deviation seen. This target is now closed. http://minorplanet.haoeydental.com.au/light_curves_2007.htm [2007-07-12 14:27, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observe from 11:00UT to 17:41UT 07/11. some scattering due to background stars. No deviation detected. data sent in. [2007-07-12 12:33, Blue Mountains Obs]

· session started from 10:43 and finished at 14:56UT. Period refined to 3.3702 +/- 0.0006h. [2007-07-07 05:48, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observe from 11:28 to 18:28UT 04/07. Period found 3.35h +/- 0.02h amplitude 0.60m . [2007-07-05 00:07, Blue Mountains Obs]

(2275) Cuitlahuac (Finished) [Add new note]
· Julian observed this target on 5 nights from Leura Obs.: unique period, no significant deviations and double coverage. We're closing it now. Nice work!

Peter K. [2007-07-03 08:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:30UT and finished at 19:28UT under bright full moon but clear condition. Data sent in. [2007-07-01 02:19, Blue Mountains Obs]

· Observation started from 12:49UT and completed at 19:58UT under good condition. Problem with 2 relatively bright star on both maxima. Attempt to clean it with SBG with perhaps some residuals. Period refined to 6.290h +/- 0.004h. All data sent to Petr. [2007-06-23 03:22, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· 2 nights observation done. A short 1 hour on 06/20 and on 06/21 started at 12:49 UT for 4 hours. Preliminary period 6.28h +/-0.01h with a huge 1mag amplitude. [2007-06-22 06:51, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2696) Magion (Finished) [Add new note]
· Adrian et al. have obtained (partially linked) data on 21 nights from Modra for the very slow rotator. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-06-18 13:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another target that could be closed at once for binast - with P probably about 360 h if not 480 h... I prefer the latter value and I hope my linkages were right. Adrian [2007-06-01 22:44, Modra]

· Observed from 22:52 to 00:26 UT on May 24/25, 2007

Stefan [2007-05-25 01:14, Modra] Message sent to BinAstPhotSurvey conference

· Observed 2007 05 19 from 20:53 to 00:35 UT, it seems to be a very long (several tens of hours) period. Leos [2007-05-20 16:52, Modra]

· Another run expected, but probably too hard to reveal period with our telescope. Adrian [2007-05-18 20:12, Modra] Message sent to BinAstPhotSurvey conference

· The sky unexpectedly cleared tonight. I plan this very low amplitude target. Adrian [2007-05-16 19:38, Modra]

· According to my first estimate this asteroid seems to be a very bad choice to recognize rotational period. There is no feature on lightcurve, constant brightness within errors. Adrian [2007-04-19 22:29, Modra] Message sent to BinAstPhotSurvey conference

· I just wanted to look at something else than at 14921 all the time. I will process data later. It was a short session tonight. Adrian [2007-04-19 02:35, Modra]

(5440) Terao (Finished) [Add new note]
· This slow rotator has been done well (P=50.32 h, U=3) by Adrian et al. from Modra (9 nights) and by Peter K. from Ondrejov (3 nights). A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys, on the slow rotator.

Cheers, Petr [2007-06-18 12:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another run for ~50h period asteroid (tumbling state can't be ruled out). Adrian [2007-06-01 20:59, Modra]

· It is about to finish this object soon. For binast it could be closed at a stroke, but I prefer to cover the composite lightcurve better. Adrian [2007-05-31 21:38, Modra] Message sent to BinAstPhotSurvey conference

· Observed from 21:17 to 22:36 UT, on May 24, 2007

Stefan [2007-05-24 22:56, Modra]

· Observed from 20:40 to 00:44 UT on Apr.30/May01, 2007.

Stefan [2007-05-01 01:08, Modra] Message sent to BinAstPhotSurvey conference

· Observed from 20:47 to 00:52 UT on Apr.29/30, 2007.

Stefan [2007-04-30 02:15, Modra]

· Observed from 20:37 to 01:02 UT on Apr.28/29, 2007. Period seems >20h.

Stefan [2007-04-29 02:24, Modra] Message sent to BinAstPhotSurvey conference

· First session on this one tonight. Peter K. [2007-04-16 00:22, Ondrejov]

(95711) 2003 AK (Finished) [Add new note]
· We close this slow rotator for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2007-06-18 11:56, Ondrejov]

· Observing this one on third night. Peter K. [2007-04-15 01:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on Apr.11/12 and will continue later tonight (after Duponta). Peter K. [2007-04-13 19:32, Ondrejov]

(24682) 1990 BH (Finished) [Add new note]
· This one was observed for 4 nights from Carbuncle and Skalnate Pleso (two nights from each station) but is too faint (and noisy) for BinAst Survey. So we are closing it now.

Peter K. [2007-06-13 09:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 21:50 UT in good conditions. Michal [2007-06-11 21:51, SkalnatePleso] [Remove]

· Started at 02:45 UT. Clouds are threatening.
Don [2007-06-11 03:01, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 22:35 UT in good conditions. Michal [2007-06-08 22:42, SkalnatePleso] [Remove]

· Started this at 02:00 UT.
Don [2007-06-07 02:10, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(7055) 1989 KB (Finished) [Add new note]
· Bob's further investigation of the May13 data has indeed led to finding that the drop of the latter session of the night was largely instrumental and not a real effect. His re-reduced data fit reasonably, no significant deviation above the 0.04-mag limit of the Survey seen.
http://www.asu.cas.cz/~asteroid/07055.png
The target is finished, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-06-05 08:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by David from Hunters Hill of June 3.6. In the meantime, Bob has checked his data of May 13.4 where the entire second session of the night has dropped, and he doesn't have a trust in a reality of the drop as there were some observational problems (though an exact cause of the deviation has not been identified yet). In following plot, the session is taken as relative (i.e., unlinked to the first session of the night):
http://www.asu.cas.cz/~asteroid/07055.png

So, this one looks to be worked enough. Bob may attempt to investigate more what was an exact cause of the drop of the second session of the May13 night, but we think that it was just an artifact and not a real feature. We will close the target after Bob's possible additional investigation of the data.

Petr [2007-06-04 14:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2007-06-03 from 09:11UT to 17:50UT in variable conditions. Good data, no deviations detected. Period refined to 4.1687 +/- 0.0002hrs with an amplitude of 0.6 +/- 0.02mag. Data sent to Petr [2007-06-04 00:23, HuntersHill] Message sent to BinAstPhotSurvey conference

· New data:
2007-05-25.6 and 27.6 by David from Hunters Hill
2007-05-27.9 by Stefan from Modra
They fit well with the period 4.1685 h:
http://www.asu.cas.cz/~asteroid/07055.png
Bob will check the unfitting data of May 13.4 (not shown in the above plot) after he is back from SAS meeting.

Petr [2007-05-28 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2007-05-27 09:57UT to 18:25UT in reasonable conditions. Period refined to 4.1689 +/- 0.0006hr with an amplitude of 0.56+/- 0.01mag. No deviations noted. Data sent to Petr [2007-05-28 01:31, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observing from 21:33UT under moderate conditions (fine cirrus clouds + Moon), ending perhaps on 00:12UT.

Stefan [2007-05-27 22:29, Modra]

· Observed from 2007-05-25 09:48UT to 18:36UT in excellent conditions. Data reveals a period of 4.172 +/- 0.007hrs with an amplitude of 0.5 _/- 0.01mag. Data sent to Petr. [2007-05-26 02:38, HuntersHill] Message sent to BinAstPhotSurvey conference

· Short session taken from 23:35 UT. Michal [2007-05-24 23:39, SkalnatePleso] [Remove]

· Two nights by Bob Stephens from GMARS and one night by Leos from Modra gave a unique period of 4.1686 +/-0.0001 h. The two sessions of the Bob's second night May13 (separated by a 1.6-h long gap due to an asterism), however, differ by 0.08 mag in mean level. Bob has checked that there is no reduction problem, so the drop of the entire second (0.8-h long) session of the night might be due to a satellite. It might look, e.g., as follows:
http://www.asu.cas.cz/~asteroid/07055.png
More data for this one are needed.

Clear Skies, Petr [2007-05-24 13:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Worked 2007-05-13 from GMARS. Clouds, wind and background stars conspired resulting in only a couple hours of data. Period refined to 4.16 hours but alias still exist. [2007-05-14 03:04, Santana] Message sent to BinAstPhotSurvey conference

· Obtained 5 hours of data on 2007-05-12 from GMARS. Period appears to be around 4.1 hours with an amplitude of 0.6 magnitudes. [2007-05-12 18:15, Santana]

· Working 2007 May 12 from GMARS. [2007-05-12 05:51, Santana] Message sent to BinAstPhotSurvey conference

(6949) 1982 RZ (Finished) [Add new note]
· This one has been done well from Badlands, Hunters Hill, Kharkiv, Ondrejov, and Skalnate Pleso:
http://www.asu.cas.cz/~asteroid/06949.png
A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-05-29 11:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vishnu has checked the Badlands data from the night May 10.4 and he found that the decrease there was apparently due to a very worsened seeing during the interval. So, the deviation seen there is probably an artifact and not a real feature.

All other data for the asteroid fit reasonably well, there is no need to work it more. We will close it after joining in all data (some reduction pending).

Petr [2007-05-20 11:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:05 in good conditions at the moment. Michal [2007-05-19 20:37, SkalnatePleso] [Remove]

· Observed 20070516 12:18UT to 16:03UT (cut short due to cloud). Data refined period slightly, no deviations seen. Data sent to Petr and Peter. [2007-05-17 09:56, HuntersHill] Message sent to BinAstPhotSurvey conference

· Began at 5:35 UTC and hope to get 5h under fairly good conditions...light wind.

Ron & Vishnu [2007-05-17 06:17, Vishnu Reddy/Tucson]

· Hi David, your latest data fit reasonably well, except a few isolated points,
http://www.asu.cas.cz/~asteroid/06949_070514.png
They probably are not significant.

Clear Skies, Petr [2007-05-15 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2007.05.14 12:11UT to 19:47UT in average conditions. Some data had to be tossed due to bright field stars. Period refined to 3.637 +/- 0.003 hrs with an amplitude of 0.28 +/- 0.03mag. Possible attenuation toward end of the session. Data sent to Petr [2007-05-14 22:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· David's session (7.2-h long) has nailed down the period solution of 3.635 h. The apparent attenuation on the night May 10.4 by Vishnu and Ron (guys, I assume that there was everything OK with the observations and reduction of the night, can you confirm?) needs to be confirmed by more observations. I encourage all to work this one now.
http://www.asu.cas.cz/~asteroid/06949.png
http://www.asu.cas.cz/~asteroid/06949_070510.png

Cheers, Petr [2007-05-14 07:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2007.05.13 12:09UT to 19:45UT in varying conditions. Large errors at start and end of run and some lost points due to crowded field. Data reveals a period of around 3.64 hrs. Data sent to Petr. [2007-05-13 22:10, HuntersHill] Message sent to BinAstPhotSurvey conference

· Completed another run of 4+ hours last night. Could not report it here because if Internet outage. Images will be sent to Vishnu for reduction.

Ron & Vishnu [2007-05-13 15:29, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Three nights (but only 3-4 hours long due to a shorter night and window for the asteroid) by Vishnu and Ron from Badlands reveal a U=2+ solution of 3.635 h, but more data, best if from another station on different longitude, are needed to nail it down.
http://www.asu.cas.cz/~asteroid/06949.png

A part of the second night's data doesn't fit well. We will see what it is after the period is well established ....

Clear Skies, Petr [2007-05-13 11:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began this at 6 UT and if good conditions hold we should get ~ 5h.

Ron & Vishnu [2007-05-12 06:11, Vishnu Reddy/Tucson]

· Began this at ~ 7 UT under good conditions.

Ron & Vishnu [2007-05-09 07:24, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

(4570) Runcorn (Finished) [Add new note]
· Two nights by Oleg from Andrushivka and by Julian from Leura have shown that this one is a slow rotator. We are closing it for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2007-05-25 09:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data by Oleg from Andrushivka and by Julian from Leura both show a continuous increase by 0.07 and by 0.12 mag, respectively, during the ~5h-long sessions. The period is clearly longer than 10 h, and probably longer than 20 hours. A following plot is just for a purpose of illustration (period as well as vertical positions of both relative sessions are arbitrary):
http://www.asu.cas.cz/~asteroid/04570.png

Oleg and Julian, feel free to work it or close it for the Survey as you like.

Cheers, Petr [2007-03-19 10:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data of 2007-03-13.0 by Oleg Gerashchenko from Andrushivka showed a continuous increase by 0.07 mag over the 5.3-h longsession. It suggests a period >20 h, in agreement with the P>30h estimate by Julian from Leura. Being a slow rotator, the target is of low urgency for the BinAstPhotSurvey; Julian and Oleg, feel free to work it or close it as you like.

Cheers, Petr [2007-03-18 13:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this target last night at 10:35UT 15/03 to 15:07UT. Looks like a slow rotator P>30h. [2007-03-16 03:44, Blue Mountains Obs]

(6615) Plutarchos (Finished) [Add new note]
· This serious binary suspect has been worked by Julian from Leura on 10 nights and by Don from Carbuncle Hill on two usable nights. Though an amplitude of only 0.06 mag has been observed, its period has been uniquely established, 2.3247 +/- 0.0001 h. Three attenuations of depth ~0.07 mag and length ~1 hour have been caught. A period of the three attenuations appears to be 40.02 h (uncertainty <0.1 h).
http://www.asu.cas.cz/~asteroid/06615_shortpc.png
http://www.asu.cas.cz/~asteroid/06615_longpc.png
Well, though the solution appears likely, this detection is not quite up to the standards of the BinAstPhotSurvey. It will have to be confirmed on a future apparition with high quality data (errors 0.01 mag or lower). As a sub-standard detection, it is not to be published on a circular, but I suggest to Julian and Don to publish the serious suspect in MPB so that it is logged in into the system.

Very good work, Julian and Don, on the pretty tough case.

Petr [2007-05-23 13:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Poor seeing and a bright background star made data on this object useless.
Don [2007-05-14 16:57, CarbuncleHill]

· Started at 01:05 UT. I should be able to get about 4.5 hours on this.
Don [2007-05-14 02:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observation were for 6 hours starting from about 09UT but the last 3 hours were severely compromised due to dew formation. I managed <0.02m with 600s integration. Data sent in. [2007-05-12 03:39, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Fog shut me down soon after the run started.
Don [2007-05-12 03:06, CarbuncleHill]

· I started this at 01:40 UT in good conditions. This is a long exposure effort (420s) as this object is reaching 17th mag.
Don [2007-05-12 02:04, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· A late start just managed 2.5 h from 11:56UT to 14:34 UT. Could have caught the end of event in the beginning but unsure. Data sent in. [2007-05-07 10:06, Blue Mountains Obs]

· Started this at 01:00 UT, under good conditions. The moon may disturb this one as it's getting increasingly dim.
Don [2007-04-25 03:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Don has caught another attenuation for this one on April 21.1. The short period is 2.3245 h (U=2+ to 3-):
http://www.asu.cas.cz/~asteroid/06615_nsp.png
A possible solution for orbital period is 40 hours, see the data folded with a half period:
http://www.asu.cas.cz/~asteroid/06615_longpc.png

More data with errors not greater than 0.02 mag are needed to nail down the orbital period.

Cheers, Petr [2007-04-23 09:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 00:45 UT.
Don [2007-04-23 00:47, CarbuncleHill]

· Clouds caused a late start. Observing from 03:00 UT.
Don [2007-04-22 03:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting this at 01:30 UT. A week and a half of clouds and rain are finally over!
Don [2007-04-21 01:25, CarbuncleHill]

· started from 11:57UT to 15:51UT 20/04. No attentuation detected. [2007-04-21 00:59, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Yes, the period solution is stabilizing at a value of 2.324h:
http://www.asu.cas.cz/~asteroid/06615_nsp.png
A couple more full-night high quality data may nail down it well.

If the 2.324h period is correct, then the Julian's last night data show another attenuation similar in depth and duration to that seen four nights earlier:
http://www.asu.cas.cz/~asteroid/06615_070414_leura.png
http://www.asu.cas.cz/~asteroid/06615_070418_leura.png
I encourage observers able to take long sessions with errors not greater than 0.02 mag to work the target.

Clear Skies, Petr [2007-04-19 09:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· A good long run from 08:53 to 16:26UT 18/04. The condition were so stable that didn't even notice a front was approaching. Period refined to 2.3247 +/- 0.0005h. appear to be better fitting than 3.3..h period. Data sent to Petr. [2007-04-19 04:51, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· target acquired at 12:28UT and completd at 16:12 UT 15/04. Data was useful but no dip observed. [2007-04-16 00:45, Blue Mountains Obs]

· target acquired at 09:28 UT and completed at 15:21 UT in very good condition. Data sent in for analysis. [2007-04-15 00:36, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Julian has worked this target on three recent nights. It turned out to be a tough target with a small amplitude of only 0.05 mag. A period solution is not unique; a few periods around 2.3 h as well as around 3.5 h are possible:
http://www.asu.cas.cz/~asteroid/06615_nsp.png
His last night showed, however, a dip by about 0.07 mag:
http://www.asu.cas.cz/~asteroid/06615_070414_leura.png
Observing conditions were excellent and there was no observational problem. The dip may be an event. We need to confirm it with more data, long sessions with errors <0.02 mag are needed. It will be probably a bit tough to establish this one well as it is already past opposition, but there are a few stations which might be able to get such data. I encourage them to work the target if they get good conditions.

Clear Skies, Petr [2007-04-15 08:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing at 09:32UT finished around 14:52 UT . Due to low altitude and faintness 2 hours of data has to be discarded. Initial period 'looks like' 2.5h with amplitude about 0.05m. Data sent to petr [2007-04-12 23:46, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started observing at 10:10 UT and finished at 16:18 UT 10/04. Unable to determine the period yet and amplitude at 0.1m. Target is quite faint at 16.3m. will attempt longer integration tonight. [2007-04-11 06:29, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(16173) 2000 AC98 (Finished) [Add new note]
· This one has been done by Michal and Marek from S. Pleso (2 nights) and by Peter K. from here (three calibrated nights). Unique solution of 6.4842 +/-0.0004 h. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-05-23 09:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 3 hours last night. Peter K. [2007-05-13 00:40, Ondrejov]

· Observed it last night (under not very good sky) and I'm planning to observe it again. It should be finished after tonight's run. The sky seems to be much better than it was yesterday. Peter K. [2007-04-25 19:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· The first data shows ~5.5 h period and 0.3 mag amplitude. [2007-04-16 12:24, SkalnatePleso] [Remove]

· Observed from 19:50 UT to 02:30 UT. Michal [2007-04-16 03:25, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 19:40 UT. Quality is low due to variable wind cond. at the moment Michal. [2007-04-14 20:20, SkalnatePleso] [Remove]

(14921) 1994 QA (Finished) [Add new note]
· This 12.913-h period target has been done from Modra, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2007-05-20 11:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Several sessions added up to yesterday. Perhaps it could be finished. I just need to link all sessions. P nearly 13 h. Adrian [2007-04-19 02:33, Modra]

· Observed 10/11 April, 00-03 UT
Leos [Remove] [2007-04-11 15:38, Modra] Message sent to BinAstPhotSurvey conference

· Observed 9/10 April, 22-03 UT
Leos [2007-04-10 15:57, Modra]

· After a nice lightcurve obtained for 1696 (rapid rotator) I would like to add a session for this slower rotating body and link with yesterday data to resolve its period. Adrian [2007-04-07 01:09, Modra] Message sent to BinAstPhotSurvey conference

· Added a new session. Adrian [2007-04-06 03:29, Modra]

· With Moon shining bright this target could be chosen till dawn. Adrian [2007-04-05 00:23, Modra] Message sent to BinAstPhotSurvey conference

· Observing it from 21:49UT, Apr.2 instead of 5484 (too close to the Moon now).

Stefan [2007-04-03 00:12, Modra]

· Observing from 21:25 UT - new ccd camera - testing! Michal [2007-03-26 22:02, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(23971) 1998 YU9 (Finished) [Add new note]
· This one has been done by Don from Carbuncle Hill (3 nights), by Peter and Kamil from here (2 nights), and by Judit from McDonald (1 night): Unique period, good coverage, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/23971.png
A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-05-19 09:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:40 UT. Peter K. + Kamil H. [2007-05-18 21:55, Ondrejov]

· Dear all, I will be observing this one tonight up to 1:15 UT. Best wishes, Kamil, Ondrejov [2007-05-17 19:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Unexpected clear sky has allowed a run to start at 02:15 UT.
Don [2007-05-16 02:13, CarbuncleHill]

· I am clouded out, and it was my last night. The previous night's data was sent to Petr, it shows a period of about 6 to 8 hours.

Judit [2007-05-15 05:47, McDonald Observatory] Message sent to BinAstPhotSurvey conference

· I started on (23971) at 05 UT. I will have one hour before I need to take a break, but I will resume observing at about 8:30 UT till dawn.

Judit [2007-05-14 05:42, McDonald Observatory]

· I'll be starting this after 6615 for a short run.
Don [2007-05-14 02:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3356) Resnik (Finished) [Add new note]
· This slow rotator revealed by David is closed for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-05-18 08:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 20070516 09:08UT to 14:51UT cut short by cloud. Data from tonight was flatlined +/- 0.02 mag over the nearly 6 hour session. Pretty sure this one have a very, very, long period and it's probably done for the survey! [2007-05-17 10:41, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2007.05.05 from 09:37UT to 17:44UT in poor conditions. Data shows a steady decline in magnitude over the 8hr session with no indication of maxima or minima indicating that the target has a period well in excess of 32hrs. [2007-05-06 01:59, HuntersHill] Message sent to BinAstPhotSurvey conference

(86829) 2000 GR146 (Finished) [Add new note]
· This NEA has been worked by Yura and Vasilij from Kharkiv (10 nights) and by Adrian and Stefan from Modra (5 nights): unique period of 3.0996 h, no significant deviation seen. It is finished for the Survey, a note added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2007-05-16 12:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· One more (last?) run observed on May 14, 2007, from 20:31 to 24:00 UT under moderate conditions. Data sent to Petr/Peter. In your hands is the final decision...

Stefan [2007-05-15 22:52, Modra] Message sent to BinAstPhotSurvey conference

· Three nights by Yura and Vasilij from Kharkiv and one night by Stefan from Modra during May 6-13. The data fit well, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/86829_070506_13_kharkiv_modra.png
Yura, Vasilij, Stefan, Adrian, let me know whether you want to work this one more, or if we close it for the Survey right away. The short shallow attenuation that occured on April 19 was marginal, below the limit of the Survey.

Petr [2007-05-15 08:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed on May12/13, 2007, from 22:36 to 01:26 UT under very nice conditions. Data sent to Petr/Peter.

Stefan [2007-05-13 16:00, Modra]

· This NEA has been worked on five nights by Yura Krugly and Vasilij Chiorny from Kharkiv, and on three nights by Adrian from Modra. The data give a good solution very close to 3.100 h (an update will be in order after receiving a confirmation from Yura on whether their data were LT corrected or not). The lightcurve shape was changing due to a rapid change of geometry during the two weeks of observations, but data in each of the three blocks fit well:
http://www.asu.cas.cz/~asteroid/86829_070417_19_kharkiv.png
http://www.asu.cas.cz/~asteroid/86829_070427_28_kharkiv.png
http://www.asu.cas.cz/~asteroid/86829_070502_04_modra.png
with only one minor deviation in the night April 19.9, where there occured a short shallow attenuation about 1.5 hours before the end of the session, see
http://www.asu.cas.cz/~asteroid/86829_070419_kharkiv.png
(Another minor deviation there, the few increased points after the gap, may be a residual artifact of an effect causing the gap there.) The apparent attenuation is only 0.03-mag deep therefore below the nominal limit of the BinAstPhotSurvey. Yura and Adrian, let us know whether you want to work this marginal one from your stations more to possibly catch the attenuation again (but the geometry might have changed already). Confirming it and establishing its period would require a significant effort from your stations. As this one is below the nominal detection limit of the Survey, I don't pursue it to be worked from other stations.

Petr [2007-05-09 09:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observations of this NEA were affected by tiny clouds (while 1487 still without significant changes). According to the weather forecast the clouds will be here in upcoming nights. Adrian [2007-05-03 01:14, Modra] Message sent to BinAstPhotSurvey conference

· After my unusual evening target - 1487 - which is not for binast, but where one attenuation probably appeared (while not confirmed later anymore) I observed this NEA in the morning last night for about 3 h. Quite a good object for deriving rotational period (which I assume to be 3.3 h or so) if I could continue again this morning at least. As for 1487 - the orbital period of its satellite could be even 100 h or more according to Petr's estimate. I'm afraid this is not for me alone to catch... Adrian [2007-05-02 20:35, Modra] Message sent to BinAstPhotSurvey conference

(28736) 2000 GE133 (Finished) [Add new note]
· David's three nights gave a unique solution, good coverage, no significant deviation seen. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David.

Cheers, Petr [2007-05-15 08:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2007.05.14 10:41UT to 18:39UT in average conditions. Guiding a problem due to the field of Dark Nebula. Period refined to 4.658 +/- 0.003hrs with an amplitude of 0.44 +/- 0.03mag. No deviations noted. Data sent to Petr. [2007-05-14 22:26, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 2007.05.13 10:44UT to 18:53UT in varying conditions. Target was passing through what appears to be a void (1/3 the field contained no stars at all). Some cloud and faint comp stars produced reasonably high errors but reveals a period of 4.658 +/- 0.006hrs with an amplitude of 0.5 +/- 0.03mag. [2007-05-13 22:53, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 2007.05.12 13:50UT to 18:24UT in worsening conditions (cloud). Data after ~16:00UT were unusable due to very high error (> 0.1mag). Data that could be used indicate a period of approximately 6 hours with an amplitude around 0.5 mag. [2007-05-13 01:27, HuntersHill] Message sent to BinAstPhotSurvey conference

(3364) Zdenka (Finished) [Add new note]
· Observed from 2007-05-11 10:30 UT to 13:37 UT in good conditions. Period refined to 7.584 +/- 0.002 hr with an amplitude of 0.43 +/- 0.01 mag.

Session cut short as Petr announced it finished for the survey. [2007-05-12 14:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 2007.05.11 10:44UT to 18:58UT in excellent conditions. Period refined to 7.586 +/- 0.005hrs with an amplitude of 0.44 +/- 0.01 mag. It's still an interesting curve and perhaps worthy of further monitoring? [2007-05-12 02:52, HuntersHill] Message sent to BinAstPhotSurvey conference

· David, Yes, a good solution about 7.58 h. A second night of similar quality and length is needed to get a double coverage. Re. interpretation of the lightcurve shape: There are obviously non-convex shape features, but to get an evidence for a synchronous binary nature, it would be needed to see a characteristic evolution of the lightcurve minima with solar phase and aspect. No binary system with separation within the Roche's limit (corresponding to orbital period of ~9.5 h for the bulk density of 2 g/cm^3) has been found so far, so we would need an extraordinary evidence to interpret this one so.
http://www.asu.cas.cz/~asteroid/03364.png

Cheers, Petr [2007-05-11 08:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 2007.05.10 10:21UT to 18:59UT in excellent conditions (though very high humidity). Data reveals a period of 7.56 +/- 0.02hrs with an amplitude of 0.44 +/- 0.01 mag.

One minima is flat. The other may be flat but there is insufficient coverage to say for sure. Plot shape reminds me of an EB/EW Binary star. Data sent to Petr and Peter. [2007-05-10 23:29, HuntersHill] Message sent to BinAstPhotSurvey conference

4951 Iwamoto (Finished) [Add new note]
· Our announcement on the extraordinary binary has appeared on IAUC 8836 today. I'm going to mention it in our web pages.

With this one published now, I can finish an update of our binaries parameters dataset. Our paper Pravec and Harris, Binary Asteroid Population. 1. Angular Momentum Content, where the dataset is introduced, is in print in Icarus, I did proofs for it a couple weeks ago, and the proof version should be available online on the Icarus preprint pages soon. I plan to put the updated binaries parameters dataset online after a final check by Tuesday.

Cheers, Petr

(4951) IWAMOTO
V. Reddy, Department of Earth System Science and Policy,
University of North Dakota, Grand Forks; R. Dyvig, Badlands
Observatory, Quinn, SD; P. Pravec and P. Kusnirak, Ondrejov
Observatory; A. Galad, L. Kornos, S. Gajdos, and J. Vilagi, Modra
Observatory; D. Pray, Carbuncle Hill Observatory, Greene, RI; W.
Cooney, J. Gross, and D. Terrell, Sonoita Research Observatory,
Sonoita, AZ; Yu. Krugly, Kharkiv Observatory; J. Ries, McDonald
Observatory; K. Archer, Ironwood Observatory, Oahu, HI; J. Oey,
Leura, N.S.W., Australia; M. Pikler and M. Husarik, Skalnate Pleso
Observatory; R. Durkee, Minneapolis, MN; F. Colas, Pic du Midi
Observatory; and A. Harris, Space Science Institute, report that
photometric observations obtained during 2006 Dec. 25.1 to 2007 Mar.
23.9 UT reveal that minor planet (4951) is a synchronous binary
system with a period of 118.0 ± 0.2 hours. A combined rotation
lightcurve has an amplitude of 0.34 mag, and superimposed mutual
events indicate a lower limit on a secondary-to-primary mean-
diameter ratio of 0.76. An estimated mean absolute magnitude in
the Cousins R system of 13.26 ± 0.05 and measured color index of
V-R = +0.48 ± 0.03 give an absolute V magnitude of 13.74 ± 0.06.
This yields estimated mean diameters for the two bodies of 4.0 and
3.5 km (uncertain by about 20 percent), assuming a geometric V
albedo of 0.20 ± 0.07 for its 'S' classification from 'SMASS II'
visible spectroscopy. The system's parameters are extraordinary in
comparison with other known small binaries, in terms of system
angular momentum and evolution to its present synchronous state;
thus, further observations are warranted. [2007-05-11 16:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hello guys,

This is to keep you informed on a development with our announcement on 4951 Iwamoto. A communication with Dan Green (see below) was a bit slow during past days, mostly because of his travel. A last section of the announcement with comments on the extraordinary character of the binary was what we discussed. Now we seem to be approaching to a reasonable compromise. We should condense the last section into a single sentence. I am going to reword it, and after a check by Alan Harris (who is extremely good in condesing English expressions while still keeping a main line of the message) later today, I will circulate it among you for your last check. I plan to resubmit it tomorrow morning.

Cheers, Petr

Hi, Petr. Sorry for the delay, but I've been continuing to
travel this past week (I will not get home to Boston until
late Wednesday or Thursday)...

On May 2, you wrote:
> > > Hi, Petr. Sorry for the silence, but I'm midway through a two-week
> > > trip in which my computer access is more spotty than usual. A
> > > referee has commented that the last portion of your text, starting
> > > with "The system's parameters are extraordinary ...", is not very
> > > appropriate for either a CBET or an IAUC. Do you have some strong
> > > reason for thinking that it should be included here, or would you be
> > > agreeable to dropping that? Kind regards, Dan Green
> >
> >
> > We would like it to be included there. We believe that mentioning an
> > extraordinary character of the system would be appreciated by readers
> > interested to observe it more.
> >

The IAUCs are not intended for the exposition of theoretical ideas.
The publication of observations should themselves be sufficient
to inspire further observations. Do you think you could condense
that last section into a single sentence that might purvey the
uniqueness of the system as you see it, in a way that might interest
potential observers without being overly theoretical and verbose?

Thanks, Dan [2007-05-09 07:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Submitted version of the announcement on this binary is enclosed below.

Cheers, Petr

(4951) IWAMOTO
V. Reddy, Department of Earth System Science and Policy, University of
North Dakota, Grand Forks; R. Dyvig, Badlands Observatory, Quinn, SD;
P. Pravec and P. Kusnirak, Ondrejov Observatory; A. Galad, L. Kornos,
S. Gajdos, and J. Vilagi, Modra Observatory; D. Pray, Carbuncle Hill
Observatory, Greene, RI; W. Cooney, J. Gross, and D. Terrell, Sonoita
Research Observatory, Sonoita, AZ; Yu. Krugly, Kharkiv Observatory, Ukraine;
J. Ries, McDonald Observatory; K. Archer, Ironwood Observatory, HI;
J. Oey, Leura Observatory, N.S.W., Australia; M. Pikler and M. Husarik,
Skalnate Pleso Observatory; R. Durkee, Minneapolis, MN; F. Colas,
Pic du Midi Observatory; and A. Harris, Space Science Institute, CA,
report that photometric observations obtained during
2006 Dec. 25.1 to 2007 Mar. 23.9 reveal that minor planet (4951)
is a synchronous binary system with a period of 118.0 +/- 0.2 hours.
A combined rotation lightcurve has an amplitude of 0.34 mag, and
superimposed mutual events indicate a lower limit on a secondary-to-primary
mean-diameter ratio of 0.76. Estimated mean absolute magnitude in the
Cousins R system of 13.26 +/-0.05 and measured color index (V-R) of
0.48 +/- 0.03 give the absolute V magnitude of 13.74 +/- 0.06.
It gives estimated mean diameters for the two bodies of 4.0 and 3.5 km
(uncertain by about 20%), assuming geometric V albedo of 0.20 +/- 0.07 for
its S classification from SMASS II visible spectroscopy.
The system's parameters are extraordinary in comparison with other known
small binaries (cf. Pravec and Harris, Icarus, in press, DOI
http://dx.doi.org/10.1016/j.icarus.2007.02.023 ); in particular, it has
an anomalously high total angular momentum content, exceeding that possible
for a single body held together only by gravity. Thus, it must have either
formed as two separate bodies, or acquired additional angular momentum
since formation. Tidal evolution to its present synchronous spin-orbit
configuration would require a time longer than the age of the solar system,
implying that some more rapidly acting mechanism must be responsible. [2007-04-27 11:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· The campaign on this target has been finished with observations by Yura Krugly from Kharkiv on March 23. His data covered phases where the 0.21-phase event was observed in February and on March 13, and they show no deep minimum, revealing that the event has also disappeared, just like the 0.71-phase event did as the March 21 observations from SRO revealed. Yura's calibrated R and V observations also give the color index (V-R)=0.47 +/-0.03.

Peter Kusnirak is completing calibrations of his R observations from here during these days (thanks to the nice photometric weather we have got with the present anticyclone, which brings also a beautifull spring here). We expect the dataset will be final in a few days, and then we will prepare an announcement for IAUC on the extraordinary binary.

Cheers, Petr [2007-04-14 11:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting at 17 UT in Kharkov. [2007-03-23 18:38, Simeiz]

· Data by Walt, John and Dirk from SRO (two linked nights March 20.2 and 21.2) and by Vishnu and Ron (night March 21.2) have covered the phases where the 0.71-phase event was on March 11, and they showed no deep minimum, revealing that we have already moved out of event geometry:
http://www.asu.cas.cz/~asteroid/04951_b.png
http://www.asu.cas.cz/~asteroid/04951_b_event2.png

It would be very useful if an Ukrainian station (Oleg? Nelya?) could cover the 0.21-phase event predicted for tomorrow March 23, 17.9 UT (LTcorr.), to see whether it has disappeared too. (Effects like asymmetric limb profile or small eccentricity may cause that evolutions of the two events may not be exactly the same.)

We will prepare an announcement on the extraordinary binary for IAUC then. The asteroid will be too faint for our instruments in the next lunation, so it will be an end of the campaign too.

Cheers, Petr [2007-03-22 12:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run at 4 UT. Clouds going by. Vishnu & Ron [2007-03-21 03:36, Vishnu Reddy/Tucson]

· Will try to cover the event tonight although forecast looks iffy.

-Walt [2007-03-21 01:21, Sonoita] Message sent to BinAstPhotSurvey conference

· Working from SRO tonight.

-Walt [2007-03-20 03:14, Sonoita]

· Data by Peter K. and Tomas Henych from here (five linked nights) and by Walt, John and Dirk from SRO (four linked nights) joined in. They have shown a moderate evolution of the lightcurve shape:
http://www.asu.cas.cz/~asteroid/04951_b.png
A detail of the 0.72-phase event observed by Julian from Leura on March 11.5 (and missed apparently by only minutes from SRO with their session of March 11.2):
http://www.asu.cas.cz/~asteroid/04951_b_event2.png
The 0.22-phase event was partially covered by Peter K. from here on March 13.9. The depth of the events decreases; compare the first plot above with
http://www.asu.cas.cz/~asteroid/04951_a.png
We may move out of the events geometry soon. It would be therefore useful to cover both events again. Next couple events are predicted to occur on following times:

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3-21 6.7 0.713

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3-23 17.9 0.213

The March 21 event centered around 6.7 UT could be covered from western US stations. The March 23 event centered around 17.9 h UT is best placed for Ukrainian stations
(Czech and Slovak stations could cover its end). It will be very useful to see what depth the events have now, or whether they haven't already disappeared .... An announcement of the extraordinary binary on CBET should be in order then.

Cheers, Petr [2007-03-19 12:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing tonight's event (from 18:40 UT). Peter K. [2007-03-13 19:06, Ondrejov]

· Starting for about 3h run after clouds cleared.

Ron & Vishnu [2007-03-13 06:07, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Julian's data of March 11 joined in. Yes, they covered a part -bottom and increasing branch of the 0.72-phase event, see
http://www.asu.cas.cz/~asteroid/04951.png
http://www.asu.cas.cz/~asteroid/04951_event2.png
The event is apparently less deep now then it was on February 10 when observed from Modra. If the same evolution is seen in the 0.22-phase event, it will indicate that we have already got past the most central event phase. An updated ephemeris for the 0.72-phase event follows.

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3-16 8.4 0.713
2007- 3-21 6.7 0.713 [2007-03-12 13:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 09:24UT 11/03 for about 4 hours under poor condition. Object maximum elevation is about 28deg. from Leura obs. I manage to get part of the 0.72 phase. Data sent in. [2007-03-12 04:15, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observing from SRO again tonight. Should be third night in a row. All data will be linked since asteroid moving slowly now and staying in the same field.

-Walt [2007-03-12 01:34, Sonoita]

· Observed for almost 4 hours last night (Mar.10/11) and also tonight (as a complementary target). Peter K. [2007-03-11 21:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from SRO tonight.

-Walt [2007-03-10 01:50, Sonoita]

· For this extraordinary binary, more observations of the events will be needed to establish it better. It should be particularly interesting to see whether the depth of the events further deepened (events becoming even more central), or if it already gets beyond the maximum events phase and the events' depth becoming less again.

Clear Skies, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3- 8 23.7 0.220
2007- 3-13 22.1 0.220
2007- 3-18 20.4 0.220

Date/Time UTC (LTc.) Phase
--------------------------
2007- 3-11 10.8 0.720
2007- 3-16 9.2 0.720
2007- 3-21 7.5 0.720 [2007-02-28 13:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data taken around 2007 Feb. 22.2 by Don from Carbuncle Hill and by Vishnu and Ron from Badlands joined in. Don has covered the full 0.22-phase event. Very important is also an addition of linkage of three nights Feb. 7.3-8.3 by Walt, John and Dirk from SRO; they nailed down the solution of the rotational lightcurve as all blocks of data are now linked together. Also added were linkages of three January nights by Don - consistent to within 0.02 mag as well.

Current solution:
http://www.asu.cas.cz/~asteroid/04951.png
Very interestign is a detailed look at the event:
http://www.asu.cas.cz/~asteroid/04951_event1.png
It reveals that the event actually evolved fast during the past few weeks: In February, it was first caught on Feb. 7.3 (SRO, LC 29), then around Feb. 12.3 (Carbuncle and Ironwood Obs., LCs 33 and 34), then on Feb. 17.2 (McDonald Obs., LC 35), and then on Feb. 22.2 (Carbuncle, LC 37). The event has continually deepened during the interval, see the picture above. While on Feb. 7.3 it was only 0.18-mag deep wrt the fit to the rotational component, it was nearly three times deeper (0.50 mag) on the last night of Feb. 22.2. So, the system's geometry was moving rapidly towards more central one during February. It also explains why the other event around phase 0.72 caught on Feb. 10.0 from Modra was not seen in January (the previous coverage of the respective phases was on Jan. 26) - the system was outside of event geometry at that time. Ok, it is well possible that the system is still moving towards more central events now. A coverage of the next event on Feb. 27.1 and Mar. 4.1 may be difficult due to the nearby bright Moon, but definitely it should be covered after the full moon on March 9.0. It will no doubt bring new data needed for understaning of the system.

Cheers, Petr

PS: In the light of the fact that the currently seen event around phase 0.22 has apparently developed during the past few weeks, it seems likely that the Dec25 event (Badlands, LC 1) was in fact not the same event as we see there now, but that it was the other one (eclipse vs. occultation). It should help a lot in modeling the system when there are more data in future. [2007-02-24 12:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Judit has observed it around Feb. 17.2 from McDonald Observatory. For the first time in this object, a full event was covered. Its depth is about 0.62 mag with respect to the mean light level outside event. There is an uncertainty on an order of a few 0.01 mag in the estimate, as no data in the block covering the minimum were accurately linked to data on other phases. An estimation of Ds/Dp is further uncertain as we cannot split rotational lightcurves of the primary and secondary. A lower limit on Ds/Dp is about 0.67.
http://www.asu.cas.cz/~asteroid/04951.png

More data obtained by Don and by Vishnu and Ron on Feb. 21-22 should cover the event again (hopefully another full coverage). If they have covered it from 23:30 to 10 UT as indicated on the webtool, they should have covered the event as well as a sufficient interval around it. If so, one more coverage (and confirmation in doing so) of the other event around phase 0.72 is needed to establish the binary well. The next event is predicted to occur around Feb. 24, 16 UT. It is probably too soon for the Czech and Slovak stations -they can start observing at about 18 UT- but even that should be very useful, since the prediction of the 0.72-phase event is particularly uncertain; it is based on one poorly covered detection and on assumption of symmetry with P/2. So, I encourage at least one of the stations here -Ondrejov, Modra, or Skalnate Pleso- to observe this one on the Saturday evening (until at least 23 UT). And if there is a station east of us (in Ukraina perhaps) able to observe on the evening Feb. 24, it would be better suited to cover the missing event.

Clear Skies, Petr [2007-02-23 09:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run at 01:50 UT 22nd Feb. Should get data till 10 UT if weather holds.Vishnu & Ron [2007-02-22 01:56, Vishnu Reddy/Tucson]

· I started this at 23:30, Feb 21 UT.
Don [2007-02-22 00:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Tonight there is an event predicted to occur around 5 h UT (Feb. 22). A coverage of +/- several hours around the predicted time is needed because (1) we need to cover also phases outside the event, and (2) there may develop another event before or after the observed event - a shadow displacement at the current solar phase may be up to five hours. I estimate that a coverage of at least +/-7 hours around the predicted time would be useful to really see well what happens there.

Cheers, Petr [2007-02-21 13:25, Ondrejov] Message sent to BinAstPhotSurvey conference

· My got, the event was yesterday, not tonight :-( [2007-02-20 20:59, Modra]

· Probably to late to start now and catch the secondary event - but it was more cloudy before. Adrian [2007-02-20 20:25, Modra] Message sent to BinAstPhotSurvey conference

· I got the full eclipse (8 hours, more than 100 points) Just before and after there is extra noise due to nearby stars of comparable brightness, but it is still very nice.

Judit [2007-02-17 11:10, McDonald Observatory] Message sent to BinAstPhotSurvey conference

· Started at 2007 2-17 2UT, trying to catch the eclipse. The sky and the weather looks good.
Judit [2007-02-17 02:40, McDonald Observatory]

· Started run at 4 UT using small telescope in AZ. Should get 8 hours of low res data. [2007-02-16 04:29, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· New data joined in by Peter K. here:
Feb. 08.3 and 9.3 from SRO,
Feb. 10.0 by Adrian from Modra,
Feb. 12.2 by Don Pray,
Feb. 12.4 by Vishnu Reddy and Ken Archer, Ironwood Observatory, Hawaii.

Don and Vishnu caught parts of the predicted Feb12 event.
The rotational period of 118.4 h is also a period of the events,
http://www.asu.cas.cz/~asteroid/04951.png
The system is at least partially synchronous (maybe fully, but we don't have an evidence whether the observed rotational lightcurve belongs to one or both bodies).

On Feb. 10.0 Adrian has caught what appears to be a second event aroudn phase 0.75. It wasn't seen before -the same phases were last covered on Jan26- that maybe due to an evolution of the observational geometry. It needs to be confirmed and better covered with more observations.

Below is an ephemeris for the rest of the lunation. Predicted mid-times of the events are listed, but keep in mind that the event duration is about 5 hours and we need to cover also parts outside them (or linked data are necessary if there are only phases inside events covered).

Date/Time UTC (LTc.) Phase
--------------------------
2007- 2-17 6.8 0.221
2007- 2-22 4.9 0.221
2007- 2-27 3.1 0.221

Date/Time UTC (LTc.) Phase
--------------------------
2007- 2-14 19.6 0.721
2007- 2-19 17.7 0.721
2007- 2-24 15.9 0.721

Clear Skies,

Petr and Peter [2007-02-13 14:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run from Hawaii at 7:40 UTC. Should get 3 hours or so worth of data. [2007-02-13 07:51, Vishnu Reddy/Tucson]

· Managed to get access a small scope (14-incg) in Hawaii. Just completed the run. Got data from 5-11 UT but the calibration is not that perfect (crappy flats). And guess what...right around 9:15 UT there is a massive background star contamination! Go figure. I have finals today so will reduce data after I finish that and get some sleep. Vishnu and Ken Archer, Ironwood Observatory, Hawaii. [2007-02-12 13:26, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Clouds are holding off so far, so I'll start this and see how long it stays clear.
Don [2007-02-12 01:06, CarbuncleHill]

· After last night I would like to raise hopes that secondary event may just arise for this asteroid with strange lightcurve. When I interrupted observation of 5407 due to background star for a while I just point the telescope to this asteroid and at the end of session, when fog came in I try to observe this once more. The difference in magnitude seems to me larger than expected. Adrian [2007-02-10 11:18, Modra] Message sent to BinAstPhotSurvey conference

· Working from SRO again tonight.

-Walt [2007-02-09 03:27, Sonoita]

· Yes, Walt caught an event on his last night:

http://www.asu.cas.cz/~asteroid/4951.png

The next opportunity to cover it again is in UT-morning of Feb 12 (assuming P_orb of 118.5 h). It will be a good opportunity for any US-station. Don't forget to observe!

Peter K. [2007-02-08 10:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· May have gotten an event last night. Will observe again tonight.

-Walt [2007-02-08 03:04, Sonoita]

· Will image from SRO tonight.

-Walt [2007-02-07 03:11, Sonoita] Message sent to BinAstPhotSurvey conference

· New data joined in:
Jan. 25.4 and 6.3 by Vishnu and Ron from Badlands
Jan. 25.8 by Peter from here
Jan. 25.9 and 26.8 by Adrian from Modra
Jan. 26.0 by Michal and Marek from Skalnate Pleso.

No deep minimum was caught since the first session of 2006 Dec. 25.1 by Vishnu and Ron. Most of the data are relative so far, only a few sessions were mutually linked, so a period solution have to wait for completing linkages (here at Ondrejov, and probably also at Modra, possibly also the three sessions by Don). Nonetheless, the preliminary period estimate of ~118 hours appears roughly ok,
http://www.asu.cas.cz/~asteroid/4951.png
The deep minimum observed on 2006 Dec. 25.1 doesn't repeat with period 118h/2. We have no good clue on its period. At this point, we think that it is OK to close this one now. We will wait for completing linkages here and possibly also at Modra and Carbuncle Hill before estimating the lightcurve period with a reliability. If/when the asteroid is observed again, it should be done with linked data only.

Petr [2007-01-27 12:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Finishing of tonight observations due to stronger wind and clouds. Adrian [2007-01-26 20:10, Modra]

· Starting this to continue and link yesterday's session. Clouds are approaching me so I can hardly obtain good quality data of (2478) tonight. Adrian [2007-01-26 19:20, Modra] Message sent to BinAstPhotSurvey conference

· Just completed a long run. Images toward the end were compromised by wind, but otherwise the conditions were excellent. Hopefully we captured another event. Early on, Vishnu notified Walt at SRO, and they switched targets to (2486) Metashovi.

Ron & Vishnu [2007-01-26 13:28, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· We have Iwamoto in the scheduler for tonight. Should run from about 4:30 UT to about 12:00 UT.

-Walt [2007-01-26 01:04, Sonoita]

· I'll start this at 01:30 UT, weather permitting.
Don [2007-01-26 00:30, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Running from 00:05 UT in average conditions. Michal [2007-01-26 00:25, SkalnatePleso] [Remove]

· A very short run, but hoping to link with tomorrow data if the weather allows. Adrian [2007-01-25 22:19, Modra] Message sent to BinAstPhotSurvey conference

· Clouds have cleared enough to give this a try for 5 or 6 hours. Conditions look better for a long run tomorrow night...hopefully to capture another event.

Ron & Vishnu [2007-01-25 07:29, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Will work from SRO tonight while Brian gets 2478 Tokai.

-Walt [2007-01-25 00:41, Sonoita]

· For this unusual object, data on 13 nights were obtained so far (some nights covered from more than one station):
Vishnu and Ron from Badlands, 2 nights
Adrian and Stefan from Modra, 6 nights
Don from Carbuncle Hill, 3 nights
Walt, John and Dirk from SRO, 2 nights
Peter K. from here, 4 nights
Michal and Marek from Skalnate Pleso, 1 night
Russ from Shed of Science Observatory, 1 night
A part of the Modra sessions were mutually linked, and the four Ondrejov nights will be linked too on a photometric night here, but most data are relative so far. A solution of 119 hours using the mostly relative data is therefore still a bit preliminary,
http://www.asu.cas.cz/~asteroid/4951.png
The deep minimum (apparently an event) observed by Vishnu and Ron on the first night was not caught again yet, but it might be just a bad luck so far. If it is a synchronous system, the next minimum will occur about January 26, 11 h UT. I encourage US stations to work this one on the night.

Cheers, Petr [2007-01-24 10:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Working from SRO tonight.

-Walt [2007-01-23 02:29, Sonoita]

· Observing from 19:20 UT. Peter K. [2007-01-21 22:00, Ondrejov]

· Started at 3:30 UT, should be able to continue until about 12:00 UT or so.

Russ [2007-01-17 04:43, Shed of Science] Message sent to BinAstPhotSurvey conference

· Started at 02:30 UT, in clear but breezy conditions.
Don [2007-01-17 02:28, CarbuncleHill]

· Observing from 18:00 UT in variable sky conditions. Expecting only few hours run due to a weather. The quality of the data - still good in my opinion, but suppose to get worse soon. Michal [2007-01-16 19:27, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 19:40 UT. Peter K. [2007-01-15 21:43, Ondrejov]

· Observing from 19:35 UT and expecting full-night run under very good conditions. Peter K. [2007-01-14 21:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Began at 4 UT. Plan to get in full run if conditions hold.

Ron & Vishnu [2007-01-10 04:42, Vishnu Reddy/Tucson]

· Doing this tonight under occasional high clouds.
Don [2007-01-10 04:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Vishnu and Ron as well as Stefan observed this one from Badlands and Modra on 2006 Dec. 25.1 and 27.0, respectively. Vishnu and Ron have detected what looks to be an increase from a very deep event (0.5 mag):
http://www.asu.cas.cz/~asteroid/4951.png
The suspected satellite is unusually large, with Ds/Dp >=0.7. The data don't give a good clue on periods yet, detecting more events as well as covering phases outside events is needed to establish this rather unusual one.

Cheers, Petr [2007-01-04 14:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· A short session added and data linked with those obtained yesterday. If the fog still waits below us I would like to be back in the morning for a while - after 15424. Adrian [2006-12-28 01:25, Modra] Message sent to BinAstPhotSurvey conference

· Started at 21:38 UT, Dec. 26. Should get about 4,5 hours data under very good conditions.

Stefan [2006-12-26 21:55, Modra]

· Started run at 08:00 UT Dec. 25. Should get at least 5 hours worth of data if weather holds.
Vishnu and Ron [2006-12-25 08:37, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

5053 Chladni (Finished) [Add new note]
· For this one, a U=3- solution has been obtained, but coverage has not been sufficient for the BinAstPhotSurvey, so it is not to be included in the Survey's sample. A summary line put to
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2007-05-03 08:07, Ondrejov]

· Started run at 2:30 UT. Should get 4 hours of data. Vishnu & Ron [2007-04-15 02:41, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Will try to extend your run Kamil. Ron and Vishnu and Brian are clouded out. Our forecast is for some clouds but hopefully we'll get some useful data.

-Walt [2007-04-09 02:15, Sonoita]

· I will try to observe this one up to ~22:30 UT (if weather permit). Could be possible to get additional data from some
USA station after my run? Best wishes, Kamil [2007-04-08 17:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:40 UT as a complementary target to 3918. Peter K. [2007-03-14 21:11, Ondrejov]

· Started run at 04:20 UT. Should get good data if the weather holds. Vishnu and Ron ! [2007-02-18 04:41, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Started run at 04 UT on 27th Jan. Some low passing clouds. Will have to wait and see what we get. Vishnu & Ron [2007-01-27 04:14, Vishnu Reddy/Tucson]

(24410) 2000 AZ236 (Finished) [Add new note]
· The limited data for this one are not sufficient for the BinAstPhotSurvey. We are closing the target. Petr [2007-05-02 15:36, Ondrejov]

· Imaged last night from GMARS. Asteroid dimmer than expected. Six hours of noisey data showed a mostly flat curve with one brief interesting peak. [2007-04-14 17:04, Santana] Message sent to BinAstPhotSurvey conference

2006 VV2 (Finished) [Add new note]
· Yura Krugly has sent three additional nights obtained by Nelya from Simeiz on March 20.1 and by him from Kharkiv on March 24.0 and 24.9. The data fit well, no event seen. A fit of the two Kharkiv sessions with three additional shorter sessions by Adrian from Modra and by Oleg from Andrushivka see:
http://www.asu.cas.cz/~asteroid/2006vv2_070321_24_mainpc.png

Yura has also mentioned that he has taken additional observations on March 28-30. He plans to reduce the data carefully (for the asteroid's rapid apparent motion during the days) later on. Since the data will be potentially very important -they may show another attenuation, in addition to the first one caught by Don on March 28.2- we are waiting for them before drafting an announcement on our results.

Cheers, Petr [2007-05-02 13:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don has linked his March 28 data:
http://www.asu.cas.cz/~asteroid/2006vv2_070328_gmasi_dpray.png
http://www.asu.cas.cz/~asteroid/2006vv2_070328_gmasi_dpray_a.png
The event is well established. It has a flat bottom, so it may be a total event. Assuming it is a total secondary event, it suggests Ds/Dp of 0.26.

Julian has observed the binary on April 4 and 9. The April 4 sessions have been linked. The data fit well, no event seen:
http://www.asu.cas.cz/~asteroid/2006vv2_070404_leura.png
http://www.asu.cas.cz/~asteroid/2006vv2_070404_leura_a.png
http://www.asu.cas.cz/~asteroid/2006vv2_070409_leura.png

The dataset on this binary is final now. It will be good to announce the accurately derived primary period, the observed event, and the additional period present (though not uniquely established) on a circular. I will write a draft and iterate it with you through the mailing list.

Cheers, Petr [2007-04-27 11:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Target observed for 8hours from 08:20UT to 16:19UT under difficult condition. object is moving though starfield making subtraction with SBG useless. those that are obviously contaminated were removed (10%). 3 trimodal curves were revealed. Observation done from Kingsgrove. Data sent to Petr [2007-04-16 00:54, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Don has done a preliminary linkage of his sessions taken around March 28.1. Following plots show them combined with the Gianluca's linked sessions of March 27.9-28.0; the combined data effectively form one 8h-long session:
http://www.asu.cas.cz/~asteroid/2006vv2_070328_gmasi_dpray.png
http://www.asu.cas.cz/~asteroid/2006vv2_070328_gmasi_dpray_a.png
It appears that Don has caught an event around 2007 March 28.20! Don will complete his linkages when he gets good sky conditions; this result is still preliminary. If it is a total secondary event, it suggests Ds/Dp around 0.29.

Don has also linked his data taken around March 29.3. They show only small deviations from the primary period, within the nominal detection limit of the Survey:
http://www.asu.cas.cz/~asteroid/2006vv2_070329_dpray.png
http://www.asu.cas.cz/~asteroid/2006vv2_070329_dpray_a.png

Cheers, Petr [2007-04-11 17:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray asked what the radar observations showed in 2006 VV2. Lance et al. published an announcement on IAUC 8826 on April 5, I'm copying it below for your convenience. I have heard from Lance and Steve Ostro that the radar data are great and that they see it promissing that they will be able to construct a model of the system as detailed as the model of 1999 KW4 published in last Fall. Lance may write more details.

Cheers, Petr

2006 VV_2
L. A. M. Benner, S. J. Ostro, and J. D. Giorgini, Jet
Propulsion Laboratory (JPL), California Institute of Technology
(CIT); M. W. Busch, CIT; R. Rose, M. A. Slade, and R. F. Jurgens,
JPL/CIT; M. C. Nolan and A. A. Hine, Arecibo Observatory; G. J.
Black, University of Virginia; and L. M. Carter, Smithsonian
Institution, report that Goldstone (8560 MHz, 3.5 cm) and Arecibo
(2380 MHz, 12.6 cm) radar observations during Mar. 27-Apr. 3 reveal
that the minor planet 2006 VV_2 (cf. MPEC 2006-V47, 2006-W87),
which passed only 0.0226 AU from the earth around Mar. 31.25 UT
(with computed V = 10.0) and has H = 16.7 (MPO 118180), is a binary
system. Preliminary estimates for the component diameters are 1.8
and > 0.3 km. The maximum orbital distance between the components
is at least 1.5 km.

(C) Copyright 2007 CBAT
2007 April 5 (8826) Daniel W. E. Green [2007-04-11 10:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Carl,
Your calibrated R data taken around March 30.3 show the primary component amplitude of 0.44 mag at solar phase about 59 deg; the asteroid's amplitude was decreasing with solar phase from 0.49-0.52 mag during March 13-28 at solar phases 99-85 deg to 0.3 mag observed by Bob Stephens around March 31.3 around solar phase of 43 deg. The combined data show a prominent change of the synodic period that shortened around the time of the closest approach by 0.004 hours, that is consistent with synodic-sidereal effect due to the asteroid's fast apparent motion and it may help to resolve a possible ambigituity in inversion of radar observations if there occurs some. Re. secondary period: Your March 30 data don't show it at a level higher than +/-0.01 mag, except a few outlying points (see the second picture below; cf. with the secondary amplitude of ~0.06 mag observed on earlier dates and higher solar phases). We will see from future analyses whether it is due to the limited length of the session (7.4 h), or if it wasn't absorbed into the solution where I had to vary the slope of the phase relation (G) for the observations with rapidly decreasing solar phase.
http://www.asu.cas.cz/~asteroid/2006vv2_070330_carlhergenrother.png
http://www.asu.cas.cz/~asteroid/2006vv2_070330_carlhergenrother_a.png

Cheers, Petr

Carl Hergenrother wrote:

"I was able to observe 2006 VV2 for most of the night of Mar 30 UT minus
a few hours when some clouds and flurries moved through. The attached
file contains the time of observation (in hours UT), absolutely calibrated
R magnitudes, and the IRAF derived 1-sigma error which is most likely
underestimated. The times are light travel corrected. The data has not
been corrected for geocentric distance but I can do that if you like.

I was also able to get good BVRI colors. The resulting colors

B-V = +0.78 ± 0.02
V-R = +0.45 ± 0.02
V-I = +0.83 ± 0.02

are somewhat ambiguous wrt taxonomic type. On a B-V/V-R plot VV2 lies
right on the C/S boundary. On a V-R/V-I plot it lies on the X/S
boundary. So I'd say it is a S-type but it is not definitive. Has anyone
else gotten colors?" [2007-04-04 07:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Bob Stephens' observations taken around March 31.3 show a primary amplitude decreased to about 0.3 mag that is an expected evolution for its decreasing solar phase where shadowing effects are smaller. The data don't fit well with the main period, but a longer period component cannot be solved well with the 0.5h-long unlinked sessions.
http://www.asu.cas.cz/~asteroid/2006vv2_070331_santana.png

Petr [2007-04-02 08:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got 6-1/2 hours of data last night from Santana Observatory. Data sent to Petr and Peter. [2007-03-31 15:31, Santana]

· Starting imaging from Santana Observatory. [2007-03-31 02:51, Santana] Message sent to BinAstPhotSurvey conference

· Gianluca has linked his additional data from March 27.9-28.0. About a half of the main period is covered twice there:
http://www.asu.cas.cz/~asteroid/2006vv2_070327_gmasi.png
The linked data don't show any prominent attenuation in the doubly covered parts of the curve that would be deeper than 0.04 mag (our nominal limit), as they fit to within +/-0.02 mag.

Petr [2007-03-29 14:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· A 2.1h-long session by Gianluca Masi shows the main period:
http://www.asu.cas.cz/~asteroid/2006vv2_070327_gmasi.png
No obvious event, but with the single coverage (the Gianluca's data cover 86% of the period), it couldn't be recognized well. Don's data taken since 0:15 UT on the same night may provide the needed second coverage.

Clear Skies, Petr [2007-03-28 13:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this at 00:15 UT on the off chance of catching an event as the geometry rapidly changes.
Don [2007-03-28 01:19, CarbuncleHill]

· Linked data by Don from Carbuncle Hill of March 26.1-26.3 joined in. Since they overlap with the Peter's data, the data from both stations are now linked making it effectively a 12.3h-long session. Here follows a fit to the Peter+Don's data:
http://www.asu.cas.cz/~asteroid/2006vv2_070325_26.png
http://www.asu.cas.cz/~asteroid/2006vv2_070325_26_mainpc.png
http://www.asu.cas.cz/~asteroid/2006vv2_070325_26_secondarypc.png
Note that now I have used there a second period of 18 hours, as now it becomes possible to fit a bimodal curve to the data (though higher orders would be needed to get a perfect fit, but a use of such higher orders is hampered by the remaining large gap in coverage).

Still not a detection at the level we require for the Survey, but it is notable how the growing amount of data makes it more interesting. In this case, the radar should reveal it in a day or so, thus we don't need to bother that the case will remain unsolved. If it was our normal target with a much longer window and much better observing circumstances, we would probably have a good amount of time to obtain sufficient data to confirm (or not) the second periodicity and to nail down it well. The criterion of having sufficient time available to get a good solution is of course one of key criteria I use when selecting proposed targets for the BinAstPhotSurvey. Objects with short windows and difficult circumstances, like 2006 VV2, are normally not proposed. The need to run the Survey in a consistent and simulable way eliminates such short-window/unfavorable-circumstances objects from proposed target list.

Cheers, Petr [2007-03-26 17:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Linked data by Peter K. here of 2007 March 25.8 to 26.1 don't fit with a single period, too. Here is how the two blocks of data, the first one of March 13-17 (with the solution driven with the first three long nights from Modra) and the second one of March 25.8-26.1 look like:
http://www.asu.cas.cz/~asteroid/2006vv2_070313_17.png
http://www.asu.cas.cz/~asteroid/2006vv2_070313_17_mainpc.png
http://www.asu.cas.cz/~asteroid/2006vv2_070313_17_secondarypc.png
http://www.asu.cas.cz/~asteroid/2006vv2_070325_26.png
http://www.asu.cas.cz/~asteroid/2006vv2_070325_26_mainpc.png
http://www.asu.cas.cz/~asteroid/2006vv2_070325_26_secondarypc.png
http://www.asu.cas.cz/~asteroid/2006vv2_070325_26_secondarypc_a.png
The first plot for each block shows how the data fit together when folded with the main period (2.4302 h). A second plot for each block then shows how it improves when a second period of 9 hours is included. The third plot shows how the component for the second period of 9 hours looks like. The fourth plot (for the March 25.8-26.1 data) then shows how the second period lightcurve component went during the night, revealing that it was at maximum in the beginning of the night, then went through minimum and then raised again.

Ok, what the data tell us? The main period is well established: 2.4302 h (dimensional estimate of the synodic-sidereal difference is +/-0.0007 h). There are observed deviations from the main periodicity that are eliminated well when we fit the data with a second period about 9 hours included. The character of the fit for the second period resembles that we have seen in other two-period asteroids (without events), but in this case of 2006 VV2, we have not established the second period well enough to interpret it consistently. The standard is to get a unique solution with repeated coverage, that was not obtained for this one so far. So, it remains a suspicious object, but not a reliable detection. I am not sure whether we should lower our standards in this special case and give out something now when we have just a suspicion, but not a reliable detection, but I think that we don't need to publish it in its current incomplete shape. In any case, since no events (deeper than our detection limit) were seen, it remains a non-detection for the Survey's sample anyway. I recall that regular binary photometric detections are such where mutual events are seen. Taking more data tonight would be likely of little value for the Survey, so I don't pursue the target more.

Cheers, Petr [2007-03-26 14:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· Will run from SRO tonight. Should have some overlap with Don to help chain the data together and extend the run further.

-Walt [2007-03-26 02:59, Sonoita]

· Started this at ~00:45, Mar 26 UT. This should extend Peter's run.
Don [2007-03-26 00:59, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observing from 19 UT. Peter K. [2007-03-25 19:54, Ondrejov]

· Three short sessions were joined in:
2007-03-16.5 by Vishnu and Ron from Badlands
2007-03-16.8 by Peter K. from here
2007-03-21.8 by Adrian from Modra
They refined the main period:
2.43026 h (dimensional estimate of the synodic-sidereal difference is +/-0.0007 h),
http://www.asu.cas.cz/~asteroid/2006vv2_shortpc.png
(Note that its amplitude of 0.49 mag is observed at solar phase of 98 degrees; the body may actually have only a small elongation.)
But because of their duration of about 2 hours each, the new data didn't contribute to resolving the second, longer period. So, the second period seen on the first three long Modra nights has not been confirmed yet.

Since the asteroid will be observed from Goldstone on March 27, it would be good to give something out tomorrow. Though this detection is not up to the standards of the BinAstPhotSurvey and normally we give out conclusive detections only, in this special case we could perhaps make an exception to the rule and give out the inconclusive one. Well, there is still a chance that Oleg's data obtained from Andrushivka on the past night, or data by Peter Kusnirak here from tonight (the sky is clearing up), if linked properly over a few fields due to the asteroid's rapid apparent motion, might confirm it. We will see tomorrow.

Clear Skies, Petr [2007-03-25 11:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started run at 18:40UT 24 Mar. in average conditions. [2007-03-25 00:26, Andrushivka]

· Changing conditions and very bad local position of our telescope, so it may happen it will not be used. Adrian [2007-03-21 18:40, Modra] Message sent to BinAstPhotSurvey conference

· Jozef, Leos, Stefan: Nice work from Modra on the five nights. Yes, the main period is resolved quite well:
2.4302 +/-0.0001 h, see
http://www.asu.cas.cz/~asteroid/2006vv2_shortpc.png
(Btw, its amplitude of 0.48 mag is observed at solar phase of 98 degrees; the body may actually have only a small elongation.)
On each of the first three long nights (duration 7.6-8 h each) there are, however, apparent systematic deviations from the single periodicity. My search for a second period showed a few possible ones, with the shortest (monomodal) one of 9.04 h with an amplitude of 0.05 mag, see
http://www.asu.cas.cz/~asteroid/2006vv2_longpc.png
http://www.asu.cas.cz/~asteroid/2006vv2_longpc_nsp.png
If it is actually a bimodal lightcurve, a real period would be 18.08 h. The two-period lightcurve suggests a presence of a second body, but no mutual event have been seen so far. We urgently need to take more data, both to confirm that the second period seen in the three Modra nights is a real feature and not some instrumental effect, and to nail down the second period solution. The asteroid is speeding up and we have just a few days before it moves uncomfortably fast.

Cheers, Petr [2007-03-18 13:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· We tried to observe this target on four nights between March 12 and 16. In spite of significant crowding turned out quite well, period seems unique ~2.43h, amplitude ~0.48m, curve shows a trimodal shape. Data sent to Petr...Jozef, Leos, Stefan. [2007-03-17 10:06, Modra] Message sent to BinAstPhotSurvey conference

(5484) Inoda (Finished) [Add new note]
· This one has turned out a bit tough because of its somewhat unusual lightcurve shape (but still dominated with the 2nd harmonic) with a longish period, but eventually we have got a unique solution with data from Modra, Kharkiv, Ondrejov, Skalnate Pleso, and GMARS, 11 nights in total:
http://www.asu.cas.cz/~asteroid/05484.png
It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work on the tough target, guys.

Cheers, Petr [2007-04-18 11:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed April 14 from GMARS. Data sent to Petr. Period appears to be around 20 hours with an amplitude of .2 magnitudes. [2007-04-16 23:03, Santana]

· Bad sky conditions, poor internet connection. Just lurking here. Adrian [2007-04-16 22:07, Modra] Message sent to BinAstPhotSurvey conference

· Observing from 20:43 UT, Apr.1 at moonlight. It's no joke.

Stefan [2007-04-01 21:26, Modra]

· Observing from 21:18 UT, Mar31 at moonlight.

Stefan [2007-03-31 21:51, Modra] Message sent to BinAstPhotSurvey conference

· Observing from 19:00 UT. Quality is lower due to high lunation and previous cloud coverage. Michal [2007-03-29 19:27, SkalnatePleso] [Remove]

· Observing this one tonight. Peter K. [2007-03-29 00:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 26/27.3.2007 00:25 - 03:15 UT. During this session gradually increasing brightness ~ 0.1 mag.

Jozef, Leos [2007-03-27 10:16, Modra]

· Observing from 20:30 UT in good conditions. Michal [2007-03-15 20:47, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

(2991) Bilbo (Finished) [Add new note]
· Yes, this one is finished for the Survey. Unique period, good coverage, no significant deviation. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David.

Cheers, Petr [2007-04-18 07:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed in changing conditions (heavy dew, fog and cloud) from 11:31UT to 18:05UT though Bilbo produced good quality data. Period refined to 4.0637 +/- 0.0011hr with an amplitude of 0.41 +/- 0.02mag. No deviations detected. I think this one is done. Data sent to Petr. [2007-04-17 22:46, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 12:04UT to 16:15UT in hazy conditions. Session start late and ended early due to cloud. Reasonable data refines the period to 4.064 +/- 0.002hrs with an amplitude of 0.4 +/- 0.02mag. No deviations noted but at least one more long session is required.

The bimodal curve is very symmetrical and fits very well to a monomodal solution even with the 'bent' curve shape. [2007-04-16 22:26, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:42UT to 17:59UT in good conditions but a huge temperature drop cutting the session short due to bad focus. Data indicates a period of 4.13 +/- 0.04hrs with an amplitude of 0.4 +/- 0.02mag. [2007-04-15 22:28, HuntersHill] Message sent to BinAstPhotSurvey conference

(23177) 2000 JD58 (Finished) [Add new note]
· This one has been done well from Skalnate Pleso on three nights: Unique period, good coverage, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/23177.png
It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Michal and Marek.

Cheers, Petr [2007-04-16 09:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:05 UT in good conditions. Michal [2007-04-13 20:09, SkalnatePleso] [Remove]

· This one shows 4.4h period with 0.6mag amplitude based on the first night. Reduction of the second night will be prepared later due to some problems with the observing computer. [2007-04-13 10:49, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 21:50 UT in good conditions. Michal [2007-04-12 21:52, SkalnatePleso] [Remove]

· Observing from 19:56 UT in good conditions. Michal [2007-04-11 19:59, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

2003 CJ11 (Finished) [Add new note]
· This one is P=5.23 h (U=2),
http://www.asu.cas.cz/~asteroid/2003cj11.png
The campaign has been closed.
Petr [2007-04-15 10:15, Ondrejov]

· We'll pick it up tonight as well Don so that we can get a very long overall run on this one.

-Walt [2007-03-28 02:45, Sonoita] Message sent to BinAstPhotSurvey conference

· Started this at 00:15, and should extend Peter's run (if clouds hold off.
Don [2007-03-28 01:18, CarbuncleHill]

· Observing from 18:30 UT and expecting full-night run (9 hours). Peter K. [2007-03-27 21:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20 UT and planning to 3:30 UT. Who will continue? Peter K. [2007-03-27 00:50, Ondrejov]

· Observed 25/26.3.2007 23:40 - 2:45 UT
Leos [2007-03-26 12:19, Modra] Message sent to BinAstPhotSurvey conference

· This one has been worked by Oleg from Andrushivka on 2007-03-15.8. The data show a relatively fast variation, see
http://www.asu.cas.cz/~asteroid/2003cj11.png
Oleg may not be able to take more data before too late because of their poor weather now, so if someone wants to take over, you are welcome.

Clear Skies, Petr [2007-03-18 13:52, Ondrejov] Message sent to BinAstPhotSurvey conference

(29801) 1999 CX84 (Finished) [Add new note]
· Another one done well by Don: three nights, unique period, good coverage, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/29801.png
It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work again, Don.

Cheers, Petr [2007-04-13 07:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 03:35 UT.
Don [2007-04-11 03:41, CarbuncleHill]

· Starting this tonight.
Don [2007-04-09 02:12, CarbuncleHill]

(27065) 1998 SJ64 (Finished) [Add new note]
· Good result for this one, David: Unique period, good coverage, no significant deviation seen. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-04-10 09:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 09:49UT to 17:26UT in average conditions cut short by fog. Period refined to 4.560 +/- 0.005hrs with an amplitude of 0.20 +/- 0.02 mag. No deviations have been detected. [2007-04-09 23:53, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 09:59UT to 16:59UT in reasonable conditions but lost data points due to occasional cloud. Period refined to 4.562 +/- 0.009hrs with an amplitude of 0.2 +/- 0.03mag. Needs to be refined further. No deviations noted as yet. [2007-04-09 02:38, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:05UT to 13:33UT when clouds terminated the session. Possible period revealed of around 4 hours with an amplitude of 0.16 +/- 0.03mag. [2007-04-08 06:37, HuntersHill]

3166 Klondike (Finished) [Add new note]
· Started this target at 12:46 UT to 18:52 UT. Target appear to be a slow rotator >20h. The third one this month... just my luck.
Julian [2007-04-10 01:54, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(13006) Schwaar (Finished) [Add new note]
· Insufficient data for this one; closing it for the BinAstPhotSurvey. Petr [2007-04-02 09:14, Ondrejov]

· 2 More nights on 13006 on the 10th and 11th. However, the data is noisey and I see no pattern whatsoever. Other target data taken on the same nights seem fine so I am ruling out anythign to do with the hardware or reduction process. Some StarBGone subtractions involved and the very low amplitude may be the reason behind the noise. [2007-01-12 08:40, HuntersHill] Message sent to BinAstPhotSurvey conference

· 3 nights (18, 26 and 27th) in relatively poor conditions. 1 night of reasonable data but the other 2 are pretty noisey. Best fit so far is around 6 hrs. [2006-12-28 01:12, HuntersHill]

(2422) Perovskaya (Finished) [Add new note]
· light curve show a slow decline over the 9 hour session indicating a slow rotator with period>40h. data sent to Petr/peter [2007-03-31 07:53, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Start new target at 10:46 UT to 19:16 UT. Relatively easy target even when moon is nearby. Weather condition is good [2007-03-30 21:18, Blue Mountains Obs]

(3851) Alhambra (Finished) [Add new note]
· Yes, a satisfactory result for the slow-ish rotator. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David.

Cheers, Petr [2007-03-29 10:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 27Mar 09:59UT to 27Mar 18:20UT in average conditions. Entire session showed a downward slope of 0.24mag but fits existing data revealing a reasonably reliable period of 26.4 +/- 0.03mag. Still gaps in the plot. [2007-03-28 22:53, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed over the last week in average to poor conditions. 10/11/13 and 14th. Data reveals a possible period of 20.8hrs (possible monomodal) with an amplitude of 0.15 +/- 0.02 mag. [2007-03-16 11:29, HuntersHill] Message sent to BinAstPhotSurvey conference

(29337) 1995 AE1 (Finished) [Add new note]
· Yes, David, this one is well done: Unique period, good coverage, no deviation seen. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work.

Cheers, Petr [2007-03-29 09:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 27Mar 10:48UT to 27Mar 18:04 in good conditions. Period further refined to 4.5096 +/- 0.0002hrs with an amplitude of 0.38 +/- 0.01 mag. No deviations noted. [2007-03-28 22:03, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 13:48UT to 18:18UT in good conditions. Data revelas a Period of 4.51 +/- 0.01 hrs with an amplitude of 0.36 +/- 0.01 mag but there are many other fits in the vicinity from 4.3 to 4.8hrs. [2007-03-24 04:18, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed on 10/3/2007 full night in average conditions. Data reveals a period of 4.52 +/- 0.04 hrs with an amplitude of 0.4 +/- 0.03 mag. [2007-03-16 22:41, HuntersHill]

(6555) 1989 UU1 (Finished) [Add new note]
· David has done this slowish rotator well enough, it is closed for the Survey now, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David, on the slightly tough one.

Cheers, Petr [2007-03-29 09:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 27Mar 08:59UT to 27Mar 14:25UT near the moon. Very Average data covers the gap in the previous curve (+/- 0.04) and refines the period to 12.6778 +/- 0.0003hrs with an amplitude of 0.27 mag +/- 0.02mag. No deviations detected.

I think this one can be called done. [2007-03-28 22:32, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 22 and 23rd in average conditions. Data still overlapping the previously covered part of the curve. Period refined to 12.6779 +/- 0.0003hrs. [2007-03-24 12:43, HuntersHill]

· Observed 22 and 23rd in average conditions. Data still overlapping the previously covered part of the curve. Period refined to 12.6779 +/- 0.0003hrs. [2007-03-24 04:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 11th, 13th and 14th in average conditions. Data still confirms a period of 12.6784 +/- 0.0004 hrs with an amplitude of 0.25 +/- 0.01 mag. Still have 1/4 of the plot not covered and 1/2 the plot not covered well. [2007-03-16 23:18, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:32UT to 18:27UT in good conditions though some moon reflection in the images (last night this lunation for this target). Data reveals a period of 12.68 +/- 0.02hrs with an amplitude of 0.28 +/- 0.02mag.

No deviations in the curev have yet been noticed. [2007-01-28 00:23, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:35UT to 18:18UT in good conditions that quickly deteriorated. Data reveals multiple possibilities for a period between 12 and 15hrs. [2007-01-27 01:19, HuntersHill]

· Observed from 12:12UT to 18:04UT in hot and dry conditions. Data indicates a period around 14hrs with an amplitude of 0.25 +/- 0.02mag [2007-01-21 01:01, HuntersHill] Message sent to BinAstPhotSurvey conference

(3918) Brel (Finished) [Add new note]
· This "primary suspect" (for being a binary missed in its first apparition for the BinAstPhotSurvey) has been done well by Peter K. from here. The period estimates from the two apparitions are in a good agreement (within a few sigma), good coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/03918_2007.png
It is finished for the Survey again, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Peter.

Cheers, Petr [2007-03-27 14:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:50 UT as a main target tonight. Peter K. [2007-03-14 21:10, Ondrejov]

· Doing second night of this target (short sessions only). Peter K. [2007-03-12 01:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· David Higgins' session of 2005-11-19.5 joined in. It is nailed down, unique period, multiple coverage, no significant deviations greater than a couple 0.01 mag seen. Well done for the Survey. Composite lightcurve see picture:
http://www.asu.cas.cz/~ppravec/3918_Brel.png

Nice work, Ron, Vishnu and David!

Cheers, Petr [2005-11-21 08:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vishnu&Ron has sent their third night of 2005-11-18.3. Their three nights appear to fit together with a single period of 3.096 h, see
http://www.asu.cas.cz/~ppravec/3918_Brel.png
The David's data of November 19 should nail it down. We will also see then whether they all fit well with the single period. At this moment, it looks that the observations obtained so far -three nights by Ron&Vishnu and one night by David- may be enough for this one, so no additional observations are called for this one at the current stage.

Cheers, Petr [2005-11-20 18:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Ron Dyvig and Vishnu Reddy have obtained data for this one on November 11 and 13. They also announced that they have taken one more night recently (Nov19 ?). I have analysed their data from the first two nights, a period likely about 3.1 h but not a unique period solution (apparently because of a sub-optimal coverage; the two nights were not consecutive and they also were not long). I will be glad to join all the data together, so please send me them.

Btw, I encouraged Vishnu and Ron to announce the first results here so that you all were informed, but perhaps because it was their first data after an upgrade of the Badlands Observatory, they didn't announce it here then. I would like to encourage them as well as all observers to put at least a very brief note on each object you work here so that observations can be well coordinated.

Cheers, Petr [2005-11-20 13:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Analysis of the first short session indicates a period around 3.2 hrs with an amplitude of 0.2mag.

http://www.users.bigpond.com/higginsdj/3918Brel.htm [2005-11-20 01:57, HuntersHill]

· Closed up 14:00UT due to heavy cloud [2005-11-19 14:10, HuntersHill] Message sent to BinAstPhotSurvey conference

· Conditions are not great but I am starting a run on this target at 10:30UT [2005-11-19 10:40, HuntersHill]

(4949) 1988 WE (Finished) [Add new note]
· This "primary suspect" (for being a binary missed in its first apparition for the BinAstPhotSurvey) has been done well by Don from Carbuncle Hill in its second apparition for the Survey: The period estimates from the two apparitions, 2.6798 +/-0.0002 and 2.6800 +/-0.0003 h are in perfect agreement, good coverage, no significant deviation seen. It is finished for the Survey again, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don, on the follow-up target.

Cheers, Petr [2007-03-25 10:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· Continuing with this tonight.
Don [2007-03-21 00:36, CarbuncleHill]

· A short run (~2.5h) on this will start after 4936 sets.
Don [2007-03-12 03:19, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I got a short run on this last night , and will (should) get a full run tonight.
Don [2007-03-10 04:44, CarbuncleHill]

· Very nice work, David. Unique solution, multiple coverage, well done for the BinAstPhotSurvey. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-10-11 10:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Some additional data obtained (once again broken up due to faint background stars). The period was further refined to 2.6798 +/- 0.00023hrs. Nothis special was noted.

http://users.bigpond.com/higginsdj/4949-1988WE.htm

This will be my last night on the target before full moon and the target will be too faint for me in the next lunation (magnitude 16+) [2005-10-10 22:50, HuntersHill] Message sent to BinAstPhotSurvey conference

· Finally a break in the weather (albeit windy) so I am doing what may well be the final run on this target. [2005-10-10 10:49, HuntersHill]

· Completed a second (short - 3.5hr) run on the target. Period refined slightly to 2.681hrs but otherwise nothing special noted.

If conditions hold I will do another run tonight. [2005-10-04 01:46, HuntersHill] Message sent to BinAstPhotSurvey conference

· Well this one turned out to be an easy target. Completed an 8 hour session and derived a period of 2.679 +- 0.009hrs (3 complete periods covered). Amplitude 0.1 +- 0.01mag.

Looks like a straightforward target. For the purposes of the survey is there a need for more coverage?

http://users.bigpond.com/higginsdj/4949-1988WE.htm [2005-10-03 02:10, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commencing run on this target at Hunters Hill. If conditions hold I may get a 6 hour run though it has been a very windy day. [2005-10-02 10:14, HuntersHill]

(4936) Butakov (Finished) [Add new note]
· This one has been shown to have a period of 13.83 h (U=2) by Don from Carbuncle Hill (6 nights), supported with one night by Julian from Leura. It is sufficient data for the slowish rotator for the BinAstPhotSurvey, we are closing it here now, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don and Julian, on the tough case.

Cheers, Petr [2007-03-20 08:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at about 00:00ut.
Don [2007-03-12 03:16, CarbuncleHill]

· Yes, any help will be appreciated but only if you can do it with errors <0.03 mag. It's 16.6 mag now and fading. Peter K. [2007-03-10 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Continuing with this tonight. Any help appreciated as it's dimming rapidly.
Don [2007-03-10 04:42, CarbuncleHill]

· Started run at 00:47 UT.
Don [2007-03-09 02:04, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this one tonight.
Don [2007-03-07 23:46, CarbuncleHill]

· Starting this one tonight.
Don [2007-02-25 00:10, CarbuncleHill]

3541 Graham (Finished) [Add new note]
· Yes, this target is finished yet -- unique period solution, multiple coverage and no attenuations seen. Nice work! Peter K. [2007-03-16 11:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· All 4 nights sent to Ondrejov. Period = 3.529 h with 0.13 mag amplitude. I think it will be finished. [2007-03-16 07:34, SkalnatePleso] [Remove]

· Observing from 19:30 UT in good conditions. Michal [2007-03-14 19:36, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 18:30 UT in good conditions. Michal [2007-03-13 18:41, SkalnatePleso] [Remove]

· Observing from 19:00 UT in a bit windy conditions. Michal [2007-03-12 22:34, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· This object observed from 18:13 UT to 03:25 UT, March 11/12. Gabo [2007-03-12 03:55, SkalnatePleso] [Remove]

(2472) Bradman (Finished) [Add new note]
· The available data didn't provide a reasonably secure result. We are closing this one for the Survey now. Petr [2007-03-08 08:17, Ondrejov]

· Doing this in the continuing quest to get some decent data, and finish it.
Don [2007-02-25 00:08, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.
Don [2007-02-19 02:52, CarbuncleHill]

· Started a run at 01:15 ut.
Don [2007-02-17 01:40, CarbuncleHill]

· Doing another run on this in somewhat windy conditions.
Don [2007-02-16 02:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this tonight, and will possibly finish it.
Don [2007-02-13 00:44, CarbuncleHill]

· Starting this one tonight.
Don [2007-02-10 03:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4374) Tadamori (Finished) [Add new note]
· Vishnu and Ron have done this one with two nights from Badlands: Unique period of 4.5047 h, good coverage, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/04374.png
It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Vishnu and Ron.

Cheers, Petr [2007-02-28 08:44, Ondrejov] Message sent to BinAstPhotSurvey conference

(6790) Hiromiyuki (Finished) [Add new note]
· Don Pray has done this one with three nights from Carbuncle Hill: Unique period of 6.827 h, double coverage, no deviation seen. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2007-02-27 14:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this tonight, but in the usual windy conditions.
Don [2007-02-19 02:51, CarbuncleHill]

(2874) Jim Young (Finished) [Add new note]
· Don's linked data revealed it to be a slow rotator with a period about 131.5 h. We close it for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work, Don.

Cheers, Petr [2007-02-26 08:49, Ondrejov]

· I'll be starting this after 3073. Wind and clouds are causing some problems so far.
Don [2006-12-28 04:41, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be doing this later tonight. This is a fairly slow rotator and will need linked sessions, which I will do.
Don [2006-12-24 23:12, CarbuncleHill]

· I plan to start this around 05:00 ut...if clouds hold off.
Don [2006-12-22 00:59, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting this a little past 05:00 ut.
Don [2006-12-21 01:14, CarbuncleHill]

· Started this at 05:10 ut.
Don [2006-12-20 05:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting my second run on this one about 05:30 ut.
Don [2006-12-19 03:46, CarbuncleHill]

(2776) Baikal (Finished) [Add new note]
· Closing this unsuccessfull one. Petr [2007-02-25 16:00, Ondrejov]

· I'm still at vacation. Expected reducing on next Friday 5.
Marek [2006-12-30 21:25, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 20:45 UT, but expecting only short session due to weather. Michal [2006-12-30 21:07, SkalnatePleso] [Remove]

· Observing from 23:00 UT in good conditions. Michal [2006-12-29 23:01, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 21:45 UT in relatively good conditions. Michal [2006-12-27 21:52, SkalnatePleso] [Remove]

(13497) Ronstone (Finished) [Add new note]
· This one was done by Don from Carbuncle Hill and by Adrian from Modra: unique period of 11.85 h, sufficient coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/13497.png
It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don and Adrian.

Cheers, Petr [2007-02-23 12:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· I hope I could finish this at last - I plan to start just now to finally cover uncovered part of the composite lightcurve. Adrian [2007-02-22 17:20, Modra]

· I try this now, but it could hardly help to cover missing part of the composite lightcurve. It seems Don's morning data in the upcoming nights would cover the rest. Adrian [2007-02-20 21:15, Modra] Message sent to BinAstPhotSurvey conference

· We got a short run from 1:30 to 4:30 UT, Feb.17, 2007

Stefan/Jozef [2007-02-18 00:51, Modra]

· 13497 has a period slightly less than 12h. It will require an observer in Europe to close the gap. A single session should do it, and great conditions aren't needed since the amplitude is about 1 mag. Any help would be appreciated.
Don [2007-02-10 21:46, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing another run on this. First session looked like a period in the area of 12h.
Don [2007-02-10 03:25, CarbuncleHill]

· Starting this tonight.
Don [2007-02-09 01:58, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(2086) Newell (Finished) [Add new note]
· Bob Stephens has found this one to be a slow rotator with a period of 78 hours. It has been well done for the BinAstPhotSurvey, we close this one here now, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Bob.

Cheers, Petr [2007-02-19 10:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 20 Jan. from GMARS. Will observe this evening. [2007-01-20 22:45, Santana]

· Observed 13 January from GMARS. No minimums or maximums observed over 8 hour session. [2007-01-15 00:12, Santana] Message sent to BinAstPhotSurvey conference

(6737) Okabayashi (Finished) [Add new note]
· Following sessions joined in
2007-02-16.3 by Judit Ries from McDonald Observatory
2007-02-17.2 by Don Pray from Carbuncle Hill
A good period solution (U=3-), multiple coverage, no deviation above the nominal limit of the Survey (0.04 mag) seen.
http://www.asu.cas.cz/~asteroid/06737.png
It is done for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Don and Judit.

Cheers, Petr [2007-02-18 15:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· The first two nights by Don suggest a period of 2.550 h (U=2),
http://www.asu.cas.cz/~asteroid/06737.png
His third session of the past night as well as the Judit's data of Feb 16 (overlaping with Don's second session) should hopefully nail it down. Then we will see whether it is strictly periodic (within detectability limit) or not.

Cheers, Petr [2007-02-17 10:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· I see variations in last night data, about 0.2-0.25 mag in R on about a one hour scale (maybe with a longer term superimposed?) Final reduction is in progress.

Judit [2007-02-17 03:20, McDonald Observatory] Message sent to BinAstPhotSurvey conference

· Started a run on this at 01:15 ut.
Don [2007-02-17 01:41, CarbuncleHill]

· Observing the object on Feb 16 (UT) from McDonald Observatory. The sky looks good for the next 6 to 7 hours.

Judit [2007-02-16 04:12, McDonald Observatory] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.
Don [2007-02-16 02:46, CarbuncleHill]

· Starting this tonight.
Don [2007-02-13 00:45, CarbuncleHill]

(2424) Tautenburg (Finished) [Add new note]
· Closing this unsuccessfull one. [2007-02-15 09:53, Ondrejov]

· These three nights were test only. No one was reduced. [2007-01-25 11:50, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 00:00 UT in windy conditions. Michal [2007-01-15 00:01, SkalnatePleso] [Remove]

· Observed from 22:00 UT, just as test, conditions poor. Michal [2007-01-14 03:21, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 23:10 UT in average conditions. Michal [2007-01-12 23:14, SkalnatePleso] [Remove]

(14142) 1998 SG10 (Finished) [Add new note]
· This object was observed by Don Pray. Linked data from 7 nights show it's a slow rotator with period of 50-60 hours or so. For this reason it's finished for our Survey.

Peter K. [2007-02-12 12:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight.
Don [2007-02-10 03:27, CarbuncleHill]

· Doing a run on this. It appears to be a slow rotator. I'll be taking linkage images tonight to link five sessions.
Don [2007-02-09 01:56, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this tonight.
Don [2007-02-08 04:12, CarbuncleHill]

· Doing a second night on this, but wind may be a problem.
Don [2007-02-06 02:53, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(2768) Gorky (Finished) [Add new note]
· This one was finished by Don Pray after 4 nights of observations. Peter K. [2007-02-09 22:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight. This will likely finish it up.
Don [2007-02-09 01:57, CarbuncleHill]

· Doing this one tonight.
Don [2007-02-08 04:13, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Starting this tonight in windy conditions.
Don [2007-02-06 02:54, CarbuncleHill]

(46598) 1993 FT2 (Finished) [Add new note]
· This one was done by Don from Carbuncle Hill on four nights: unique solution, good coverage, no significant deviation. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2007-01-27 16:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing a second night on this.
Don [2007-01-21 04:23, CarbuncleHill]

(3573) Holmberg (Finished) [Add new note]
· This one was done by Adrian et al. from Modra: Unique period, good coverage, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/03573.png
It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Adrian et al.

Cheers, Petr [2007-01-26 09:38, Ondrejov] Message sent to BinAstPhotSurvey conference

(1790) Volkov (Finished) [Add new note]
· Bob did this one from GMARS on four nights: Unique period of 10.74 h, no deviation seen. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice result, Bob.

Cheers, Petr [2007-01-22 09:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 20 Jan from GMARS. Planning a run for this evening. [2007-01-20 22:45, Santana]

· Observed 13 and 14 January from GMARS. Period appears to be around 11 hours. [2007-01-15 00:08, Santana] Message sent to BinAstPhotSurvey conference

(3314) Beals (Finished) [Add new note]
· This one was done by Don Pray from Carbuncle Hill on three long nights: Unique period, good coverage, no deviation. It is finished for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2007-01-18 14:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this one tonight.
Don [2007-01-10 04:22, CarbuncleHill]

44060 (Finished) [Add new note]
· Closing this. Petr [2007-01-16 08:28, Ondrejov]

· started at 18:00 UT. as yet, weather seems favourable. jozef [2006-12-08 18:48, Modra] Message sent to BinAstPhotSurvey conference

(2328) Robeson (Finished) [Add new note]
· David has done this one sufficiently from Hunters Hill: a longish period with U=2. It is done for the Survey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David, on the somewhat tough target.

Cheers, Petr [2007-01-12 10:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed 3 more nights on the 7th, 10th and 11th. Data reveals a period of 18.682 +/- 0.007hrs with an amplitude of 0.2 +/- 0.04mag. No deviations detected and there is a small gap (~ 2hrs) in the curve at phase 0.75.

Getting good data has been difficult due to the smoke haze and hot dry nights... [2007-01-12 08:08, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full night observed 10:24UT to 15:03UT. Target getting too faint for Survey precision but indications are for a bimodal period of around 18 hrs based on a reasonable fit monomodal at 9.0hrs with an amplitude of 0.18 +/- 0.04mag. [2007-01-06 03:52, HuntersHill] Message sent to BinAstPhotSurvey conference

· 2 almost full nights (26th and 27th) producing some reasonable data in relatively poor conditions indicate a period in the order of 10-13hrs. However, interfearance from bright field stars cannot be ruled out. [2006-12-28 01:09, HuntersHill] Message sent to BinAstPhotSurvey conference

· 2 nights started at 10:09 UT 07/12 (2hrs) and 10:04 UT 10/12(5hrs). Data sent in . [2006-12-11 10:33, Blue Mountains Obs]

· said too soon , fog rolled in .. no useful data. [2006-12-06 11:39, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Start with this new target at 10:00UT 05/12. Weather good expect a full session [2006-12-05 10:11, Blue Mountains Obs]

(15424) 1998 QE100 (Finished) [Add new note]
· This one has been done well from Modra: unique period of 10.9 h, no significant deviation. It is done for the BinAstPhotSurvey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Adrian et al.

Cheers, Petr

Btw: Our mail server has had some hickups recently. I hope it will be fixed later today. Please resend tomorrow if you don't receive my reply by then. Sorry for the inconvenience. [2007-01-10 08:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing 15424 tonight - just above fog. Adrian [2006-12-28 01:20, Modra]

· Observing under slightly changing conditions, but longer session than yesterday. Adrian [2006-12-14 03:42, Modra] Message sent to BinAstPhotSurvey conference

· Trying this one again. Poor conditions last night prevented getting useable data.
Don [2006-12-12 01:03, CarbuncleHill]

· Starting this one tonight. Most of the run will occur after my other targets.
Don [2006-12-11 00:17, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(9111) Matarazzo (Finished) [Add new note]
· This one has been shown to be a slow rotator by David Higgins from Hunters Hills in November. We close it for the BinAstPhotSurvey now, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2007-01-04 15:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:18UT to 17:16UT in poor conditions. This session observed a virtually flat line. This would tend to indicate a minima or maxima of a very long period target (based on last nights continual increase I would suggest that this is a maxima) [2006-11-26 21:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 12:05UT to 17:53UT in average conditions.

This target was located in satellite alley - there were more satellites than images and lost images due to satellite passage directly through the target or one or more comp stars! In any case, 9111 has a period in excess of 20hrs as the plot shows a continuous increase in magnitude over the duration of the session of 0.3 +/- 0.02mag [2006-11-26 01:09, HuntersHill] Message sent to BinAstPhotSurvey conference

(4299) WIYN (Finished) [Add new note]
· Closing this slow rotator, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2007-01-04 14:12, Ondrejov]

· Observed from 11:57UT to 18:22UT in good conditions. Good SNR. Plot showed a continuous increase in brightness over the duration of the session indicating the target must have a period in excess of 26 hours. [2006-10-23 22:48, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:56UT to 18:28UT in good conditions. SNR for better than 0.005mag precision however the plot shows a gentle undulation and rise over the 6.5 hrs session with a total amplitude of 0.06mag. This one might be a bit of a challenge :-) [2006-10-22 22:02, HuntersHill] Message sent to BinAstPhotSurvey conference

(25458) 1999 XT13 (Finished) [Add new note]
· This one is a U=3- result; the most likely period is 3.6593 h, but a half period (1.829 h) cannot be ruled out though it is unlikely physically. In any case, the coverage is good and there is no indication of binarity seen,
http://www.asu.cas.cz/~asteroid/25458.png
There is little chance that data of sufficient quality to rule out the half period would be taken in the next lunation, so we are closing it now. A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2006-12-01 10:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one has likely a period of 3.659 h as found by David Higgins (3 nights) and with two nights from Modra. A half period, 1.829 h, fits however entirely well too.
http://www.asu.cas.cz/~asteroid/25458.png
With the amplitude of 0.28 mag, the half period cannot be entirely ruled out on a basis of physical implausibility. It would be of course a rather unusual asteroid (rotation faster than all other asteroids in its size range, suggesting a high bulk density), the period of 3.659 h is likely the real one, but it would be good to resolve it deterministically with high quality data with errors not greater than 0.01 mag. If there is someone able to get one or two full nights with such high accuracy for the target, I encourage to work it to resolve possible smaller features that would rule out the half period.

Clear Skies, Petr [2006-11-20 16:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:30UT to 17:06UT in good conditions. Period refined to 3.6596 +/- 0.0004hrs with no nearby matches. Amplitude of 0.24 +/- 0.03mag. No significant deviations found in the plot.

Data sent to Petr and Peter. [2006-11-18 01:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:04UT to 17:11UT in good conditions. Target fainter than expected but data revealed a period of 3.6972 +/- 0.0004 hrs with an amplitude of 0.24 +/- 0.03 mag. [2006-11-16 21:38, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 20:47 UT on Nov.9,2006 under variable cloudiness.

Stefan/Jozef [2006-11-09 23:20, Modra]

· Observed from 10:58UT to 13:21UT in marginal conditions (bright moon and bright field star). Night cut short due to impending front.

Data indicates a monomodal fit around 2.2hrs with an amplitude of 0.28 +/- 0.04mag I believe the target is a little fainter than expected. [2006-11-01 21:27, HuntersHill] Message sent to BinAstPhotSurvey conference

(3590) Holst (Finished) [Add new note]
· Period of 12.763 h derived with seven nights by David Higgins from Hunters Hill supported with one night from Skalnate Pleso is a U=2 solution,
http://www.asu.cas.cz/~asteroid/03590.png
More relative data with errors about 0.018 mag wouldn't be likely to nail it down in the rest of this lunation, and the asteroid will be fainter in the next lunation, so we are closing it here for the BinAstPhotSurvey now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-11-30 15:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 16:35 UT in a relatively good sky conditions. Finished at 00:35 UT. Michal [2006-11-28 00:38, SkalnatePleso] [Remove]

· This target was observed by David Higgins on 7 nights. The most probable solution is 12.764 h but 1/2 and 3/2 of it are also possible:

http://www.asu.cas.cz/~asteroid/03590.png

We need more accurate data (errors <0.01 mag) to resolve between them. One or two long runs (as long as possible) should be enough.

Peter K. [2006-11-26 08:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:07UT to 15:59UT in average conditions. The gap has been filled int he curve and the 'jink' is real! Period refined to 12.7650 +/- 0.0013hrs with an amplitude of 0.16 +/- 0.02mag.

Other than a couple of deviating points at the end of a single session, no deviations are noted so I think this one is done. Data sent off to Petr and Peter. [2006-11-25 00:36, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:21UT to 16:11UT in less than ideal conditions. Period refined to 12.765 +/- 0.0014hrs with an amplitude of 0.14 +/- 0.02mag.

However, there is a small gap in the plot (about 30 minutes) and each side of the gap look like they would not align well (bit of a jink required) so more data required. [2006-11-23 21:23, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:12UT to 16:10UT is ordinary conditions. Best fit to a period of 12.906 +/- 0.002hrs on a curve that does not line up well with other fits at 12.62 and 12.77.

Based on a half period best fit at 6.383 I think 12.767 offers the best solution so far. Hopefully Dons data will help. My data sent to Petr and Peter. [2006-11-22 21:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started this one in hazy conditions. It's forecast to clear, which I have my doubts about.
Don [2006-11-22 00:54, CarbuncleHill]

· Started at 00:10, Nov 21 UT.
Don [2006-11-21 00:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:25UT to 16:18UT in average conditions. Period refined to 12.609 +/- 0.003hrs with an amplitude of 0.1 +/- 0.01mag. Still more than 1/3 of the plot not covered. [2006-11-19 21:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:19UT to 18:10UT in reasonable conditions. Period refined to 12.69 +/- 0.02hrs with an amplitude of 0.1 +/- 0.02mag. Result supported by very good fit at 1/2 period (monomodal). No significant deviations seen.

As the result is so close to 12hrs, it will take quite some time to complete the entire curve without assistance from US/Europe. [2006-10-29 21:46, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:23UT to 18:02UT in reasonable conditions. Best period is 8.47hrs but not unique as yet and I can't rule out alias's either. [2006-10-29 03:18, HuntersHill]

· Observed from 11:26UT to 14:26UT in average conditions cut short by cloud. Data indicates a period in the vicinity of 6-7 hours with an amplitude of approx 0.1mag [2006-10-25 22:50, HuntersHill] Message sent to BinAstPhotSurvey conference

(3279) Solon (Finished) [Add new note]
· This one has been done well by Bob from GMARS supported with one short session by Peter from here. Unique period, good coverage, no significant deviation. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-11-30 15:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 1,5 hour only due to high clouds. I hope it will be useful when combining with Bob's data. Peter K. [2006-11-23 05:44, Ondrejov]

· I see Solon was added to the list of new targets. I got a night in on Nov. 19. It appears to have a period just over 8 hours and an amplitude of around 0.9 magnitudes. It is on my schedule for this weekend. [2006-11-22 16:41, Santana] Message sent to BinAstPhotSurvey conference

(3533)Toyota (Finished) [Add new note]
· This one has been done well by Don from Carbuncle Hill and by Michal, Gabo and Marek from Skalnate Pleso. Unique period, good coverage, no significant deviation:
http://www.asu.cas.cz/~asteroid/3533.png
A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2006-11-30 14:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object observed from 19:48 UT to 01:04 UT, November 29/30. Gabo [2006-11-30 01:29, SkalnatePleso] [Remove]

· Observing from 18:45 UT in a relatively good conditions. Michal [2006-11-28 18:51, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Started around 02:00ut in fair conditions. Fog may close things down later.
Don [2006-11-28 03:07, CarbuncleHill]

· Observing from 00:45 UT in a good conditions. Michal [2006-11-28 00:45, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Started around 02:00 ut. Conditions are good now, but clouds loom to the west, and may interfere.
Don [2006-11-26 03:05, CarbuncleHill]

· Starting this one tonight in good conditions.
Don [2006-11-25 03:57, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(1065) Amundsenia (Finished) [Add new note]
· This one took a bit of collaboration between Skalnate Pleso, Carbuncle Hill, GMARS, and Ondrejov to get a unique result. Eventually, it has been resolved:
http://www.asu.cas.cz/~asteroid/1065_2006oct.png
http://www.asu.cas.cz/~asteroid/1065_2006nov.png
Unique period, no significant deviation, good coverage. It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys!

Cheers, Petr [2006-11-20 16:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· The clouds came in solid, so that's it for tonight. No useful data.
Don [2006-11-19 02:19, CarbuncleHill]

· I started this at 23:10, Nov.18 UT. Partly cloudy conditions make things unpredictable.
Don [2006-11-18 23:18, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· My earlier targets have set, so I'm doing 1065 for the remainder of the night. I'm also giving Adrian's 11657 a try.
Don [2006-11-18 04:44, CarbuncleHill]

· Observing from 16:45 UT. Peter K. [2006-11-15 18:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:20, Nov.11 UT.
Don [2006-11-11 00:44, CarbuncleHill]

· I started this at 23:30, Nov. 9 UT.
Don [2006-11-09 23:38, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This object observed from 18:00 UT to 03:51 UT, October 25/26. Gabo [2006-10-26 04:05, SkalnatePleso] [Remove]

· Observing from 19:00 UT in a changeable wx conditions. Michal [2006-10-23 19:07, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 17:20 UT in a good conditions at the moment. Michal [2006-10-22 18:33, SkalnatePleso] [Remove]

· Observing from 20:00 UT in a good weather conditions. Michal [2006-10-21 20:27, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

2006 RZ (Finished) [Add new note]
· Additional data (actually the most accurate ones) taken by Judit Ries on Sept. 23.2, 24.2 and 25.2 joined in. They are in excellent agreement with the previous data.

The solution from the best data we have got for this one: 4 nights by Peter Kusnirak from here, 3 nights by Judit Ries, and 1 night by Mike Hicks from TMO (1 night) taken during 2006 Sept. 23.0 to 25.9 (while it was approaching and in favorable conditions): 4.960 +/- 0.003 h, see
http://www.asu.cas.cz/~asteroid/2006rz.png
The Peter's and Mike's data were calibrated in the Cousins R system to Landolt fields, and they fit nicely to within 0.01 mag in the absolute level.
We have not been able to eliminate a half period (2.480 h) solution with the available data, but radar data ruled out it.

Additional data with somewhat higher errors (just slightly below the requirement for the Survey) were obtained by Gianluca Masi on one night of 2006 Sept. 30-Oct. 1 and by Gary Vander Haagen on two nights 2006 Sept. 29 and Oct. 2:
http://www.asu.cas.cz/~asteroid/2006rz_gmasi_gvhaagen.png
They are consistent with the period of 4.96 h found from the Sept. 23-25 data and they should be useful for future modeling of the asteroid (assumed together with the radar data).

The data by Peter, Judit, and Mike are of sufficient quality for the BinAstPhotSurvey, I'm going to include them into the Survey's sample here. A note on it will be put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
shortly.

Cheers, Petr [2006-11-15 13:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· The run lasted 6 hours, finally. Reasonably usable sky conditions. Star density over average.

Once reduced, data will be send to Petr.

Gianluca and Sergio [2006-10-01 00:29, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· started at 18:20 UT. Several stars are going to be involved with the target as it moves. We plan 5h of coverage. Clear skies now, bit tiny clouds at the horizon.

Gianluca Masi, Sergio Foglia [2006-09-30 21:00, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· I'll be trying this one in a crowded star field.
Don [2006-09-28 02:58, CarbuncleHill]

· Peter K. has completed absolute calibrations of his R data. So, the five nights (4 from here and 1 from TMO) are now calibrated to the Cousins R system, and their levels agree to within +/-0.01 mag for a best fit G of -0.04.

Cheers, Petr

PS: I will be busy with local matters for the rest of this week, so please remember to send your new data to Peter K. here who will attend to them when I am busy. [2006-09-27 08:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Four nights by Peter Kusnirak from Ondrejov and one night by Mike Hicks from Table Mountain Observatory give a double solution for period of 2006 RZ:
2.483 +/- 0.002 h
or
4.964 +/- 0.003 h
Composite lightcurves see
http://www.asu.cas.cz/~asteroid/2006rz_a.png
http://www.asu.cas.cz/~asteroid/2006rz_b.png
Brian Warner's night of Sept. 25.2 fits with the periods as well, but it shows a few outliers (or real deviations?) that Brian plans to check, so we will see whether they mean something later on.

To resolve the ambiguity, data with lower errors about 0.01 mag or so are needed. If there is someone able to take them, I encourage you to do so. A couple nights with a 1-m sized telescope might be enough to resolve the ambiguity.

Supplementary information: The first three of the four Ondrejov nights by Peter K. have been mutually linked; their magnitude scale zero points fit well to +/-0.01 mag for both solutions. Mike Hicks has calibrated his session in the R system: It gives an H_R estimate of 19.9 but with an error of +/-0.3 (as we extrapolate from 33 deg to zero solar phase). For colors measured by Mike, it gives H=H_V about 20.3 (but again with an error of at least +/-0.3).

Cheers, Petr [2006-09-26 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a run about 02:00 UT (Sept 26). Hoping for 7hr run. The thing is running into somewhat crowded fields. [2006-09-26 03:21, PalmerDivide]

· We try to help with this object. Started from 19:42 UT. Conditions seem to be good to the morning.
Marek and Gabo [2006-09-25 20:38, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Started about 02:00 UT. Skies look to be good for 7hr run. [2006-09-25 02:31, PalmerDivide]

· Just started 3rd night for 2006 RZ. No clear solution yet, so I'm hoping this night will help. Peter K. [2006-09-24 18:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 18:35 UT and expecting full-night run (ending at 2 UT). Peter K. [2006-09-23 20:29, Ondrejov]

· Observing from 18:35 UT and expecting full-night run (ending at 2 UT). Peter K. [2006-09-23 19:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started observing in R on Sept. 23 02 UT from McDonald Observatory.
Judit G. Ries [2006-09-23 02:32, McDonald Observatory]

· Observing from 22 UT -- helping to Brian W. who started it 2 nights before. Peter K. [2006-09-22 22:21, Ondrejov] Message sent to BinAstPhotSurvey conference

(6497) Yamasaki (Finished) [Add new note]
· This one has been done well by Don from Carbuncle Hill, 7 sessions, unique period solution, good coverage, no significant deviation seen. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, Don.

Cheers, Petr [2006-11-13 10:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started this at 00:20, Nov.11 UT. Hopefully, this run will finish it.
Don [2006-11-11 00:46, CarbuncleHill]

· Starting this one at 3:00UT.
Don [2006-10-30 02:57, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I started this at 02:20UT.
Don [2006-10-27 03:50, CarbuncleHill]

· I'll doing this one after the run on 2754 is over (04:00).
Don [2006-10-22 00:20, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· This was on the list a few weeks ago, but disappeared for some reason. I did a short run on it on 9/28, and am continueing with it tonight. (Finished w/ 2754 for tonight).
Don [2006-10-19 02:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(3402) Wisdom (Finished) [Add new note]
· This one took some time to finish, by eventually sufficient data were obtained. Done by Don from Carbuncle Hill, supported by Michal from Skalnate Pleso and by Peter from here. Unique period, coverage marginal but sufficient eventually , no significant deviation seen. It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-11-04 17:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 19:30 UT in not perfect conditions but data should be usable. Peter K. [2006-10-22 20:18, Ondrejov]

· Observing from 18:30 UT in increasing wind speed. Catching the whole period can not be guaranteed for the moment. Michal [2006-10-19 18:33, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 18:35 UT in a good weather conditions.Observation stopped at 20:10 UT due to a gust wind -increasing tendency. Michal [2006-10-18 20:20, SkalnatePleso] [Remove]

· I started this around 02:30, Sept 28 UT.
Don [2006-09-28 02:57, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting this around 02:00, Sept 27UT.
Don [2006-09-26 23:15, CarbuncleHill]

· I'll be starting this in a few minutes.
Don [2006-09-26 00:13, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(6815) Mutchler (Finished) [Add new note]
· This one will be already rather faint after the full moon (V about 17 and fading). The fairly extensive effort by Don from Carbuncle Hill, by Adrian from Modra, by Bob from GMARS, and by Peter from here have established its main period well, and one prominent and two shallow/incomplete attenuations have been caught, but their period is probably relatively long and there is little hope that low quality data in the next lunation would establish it satisfactorily. Therefore, we close this one for the BinAstPhotSurvey now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-11-04 15:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 18:35 UT Oct.30. Soon after start clouds caused a gap, but now is run OK. Considering Don's planned begin of session, I will end my run at about 1:20 UT Oct.31. Some overlapping is suitable.

Stefan [2006-10-31 00:23, Modra] Message sent to BinAstPhotSurvey conference

· I'll be starting this around 01:00ut in good conditions.
Don [2006-10-30 22:47, CarbuncleHill]

· Peter K.'s data of 2006-10-25.9 showed another attenuation, this one being more pronounced that the lower amplitude/incomplete ones caught by Don on October 19.2 and 24.1, see
http://www.asu.cas.cz/~asteroid/06815_061025_ond.png
This one is relatively long (duration about 3.3 h), suggesting a relatively long orbital period of the binary candidate.

Long or linked sessions with photometric errors about 0.02 mag or better will be useful for this one. Don't bother in poorer conditions.

Clear Skies, Petr [2006-10-30 09:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing in breezy conditions. Hopefully, things will settle down.
Don [2006-10-30 02:53, CarbuncleHill]

· Doing this one tonight.
Don [2006-10-27 03:56, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Between wind, clouds and a bright, nearby star, data was useless and not submitted.
Don [2006-10-26 20:52, CarbuncleHill]

· Started around 01:00ut
Don [2006-10-26 01:16, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed for almost 5 hours (18-23 UT, Oct.25). Peter K. [2006-10-26 00:20, Ondrejov]

· I'll be doing this one tonight.
Don [2006-10-24 01:05, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting this one around 03:00, Oct 22 UT.
Don [2006-10-22 00:17, CarbuncleHill]

· My attempt again this night - and again conditions are far from perfect due to thin clouds. Adrian [2006-10-19 22:33, Modra] Message sent to BinAstPhotSurvey conference

· I'll be starting this one around 03:00, Oct 19 UT.
Don [2006-10-19 00:38, CarbuncleHill]

· OK, I will try to do this target tonight at least partly - but also linkages for 1703 are needed as according to weather forecast some clouds are coming. Adrian [2006-10-18 19:26, Modra] Message sent to BinAstPhotSurvey conference

· Don Pray has started this new target, a marginal solution so far:
http://www.asu.cas.cz/~asteroid/06815.png
more data with errors not greater than 0.02 mag are needed. If you can help out, take a couple nights right away. Don has noted that the asteroid appears somewhat dimmer than predicted, but it should be still workable by some of you with the sufficient quality (and it will be in opposition in a few days, so it is an ideal time to work it now).

Clear Skies, Petr [2006-10-18 17:21, Ondrejov] Message sent to BinAstPhotSurvey conference

(23260) 2000 YA34 (Finished) [Add new note]
· Data obtained for this one gave only U=1 result. The asteroid is faint now so we cannot take sufficient data to solve it, therefore we close the target here now.

Petr [2006-11-04 15:22, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 09:30UT to 16:26UT in average conditions. Things looked good until 1/2 way through the session when what appears to be some haze and moon reduced SNR.

Given the noise and error in the second half of the session the original assessment of siomething around 9 hrs may still hold but the amplitude is stillv ery low and my errors were equal to the amplitude.... [2006-10-10 22:47, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:18UT to 17:28UT in reasonable conditions. Data still flat with an amplitude under 0.04 +/- 0.005mag. Data is still too flat and noisey to make any period stand out. Lots of possibilities though Canopus likes 8.8hrs. [2006-09-28 23:58, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:42UT to 17:21UT in thin cloud. I guess I am paying for all those short period targets I got for the first half of the year..... This one shows an amplitude of 0.04 +/- 0.005mag over the entire 7 hr session. There is some smoothish variation within that amplitude (3.06hr period at a stretch) but chances are it is just 'noise'. [2006-09-27 22:55, HuntersHill] Message sent to BinAstPhotSurvey conference

(7825) 1991 TL1 (Finished) [Add new note]
· Two nights by Rui Goncalves from Linhaceira showed that this one has a period longer than 10 hours (probably longer than 20 h). Demonstrating long(ish) period is sufficient result for the BinAstPhotSurvey for slow rotators, and since it is not likely that more good data will be obtained for this one, we are closing it here now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-11-03 16:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· This target was observed from 20:35UT to 01:54UT Oct.12/13 and from 20:44UT to 00:58UT Oct.13/14. For each session a similar steady slope of 0.04-0.05 mag is observed. Probably period is a long one (of 24h?). Continuous fallow up this target with long/or linked session are needed. Target apparent velocity is 61"/h, with 15.1 mag and fading. Weather conditions are now very bad and will stay that way for several days more.
Data sent to Petr. [2006-10-18 15:25, Linhaceira] Message sent to BinAstPhotSurvey conference

5171 (Finished) [Add new note]
· Really nice work, Adrian, on the very slow rotator with a period near 480 hodin! Your 23 linked nights (in two blocks) show it uniquely. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
Note: In
http://www.asu.cas.cz/~asteroid/05171.png
each point plotted is an average of about 20 measurements.

It is the fifth slowest rotator in our database now, slower ones are only 288 Glauke, 1220 Crocus, 1997 AE12, and 1998 XB. Though not a topic of the BinAstPhotSurvey, data on such extreme slow rotators should be useful for other studies.

Cheers, Petr [2006-10-31 18:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· No reason to continue with this - we can close it. Rotation period is about 20 days! Moreover, it is probably a tumbler. Adrian [2006-10-31 16:59, Modra]

· I hope I could join another point to the unknown very long period. Linkages will probably be a difficult task. Adrian [2006-10-18 18:15, Modra] Message sent to BinAstPhotSurvey conference

· Observation status: we done shorter runs on September, 23./24.(2x), 24./25.(4x), 26./27.(1x), 27./28.(1x), 28./29.(2x), 29./30.(1x), 30.9./1.10.(1x); on October, 1./2.(1x), 8./9.(1x), 9./10.(1x), 10./11.(2x), 11./12.(1x), 14./15.(1x), 15./16.(1x). We are observing it still, and linking continuously (truly difficult task).

Stefan, Jozef [2006-10-15 21:13, Modra] Message sent to BinAstPhotSurvey conference

· Second night 24/25.9. [2006-09-25 22:35, Modra]

· Start observing from 20 UT. leos [2006-09-23 22:00, Modra]

(1703) Barry (Finished) [Add new note]
· Nice work, Adrian et al., on the slow rotator. Yes, your 11 linked nights give a unique solution of 107.1 h. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-10-31 18:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· We can close even this - with period of about 107 h. It may be a tumbler as well, but again the number of points is poor. Adrian [2006-10-31 17:03, Modra]

· I can take it for a while. Starting at 02:00 UT. Michal [2006-10-20 02:08, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· I'm afraid, some thin clouds came faster, so linkages for 1703 and my first (short) run for 6815 were influenced. Data are of unsufficient quality. Adrian [2006-10-19 00:43, Modra]

· Observation status: to date we done longer/shorter runs,
as follows: October, 5./6.(1xlong), 6./7.(1xlong), 9./10.(1xlong), 10./11.(1x), 11./12.(1x), 14./15.(2x). Linkage
is ahead :-(

Stefan/Jozef [2006-10-16 02:22, Modra] Message sent to BinAstPhotSurvey conference

· I chose this from the previous Petr's object list as no other working object could be done here during the two previous nights with full Moon in the background. However, it is a slow rotator again (P of several dozens hours) - nothing for our binast group :-) I could hardly continue with this - as probably only linked observations will be valued. Adrian [2006-10-07 08:25, Modra] Message sent to BinAstPhotSurvey conference

(6263) 1980 PX (Finished) [Add new note]
· Data obtained for this one by Julian from Leura plus one night by Adrian from Modra didn't establish its period clearly, it is not sufficient to be included into the Survey's sample. There is little hope that more data for the faint target now or after the full moon would bring a resolution, so we are closing it here now.

Petr [2006-10-30 12:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started session at 11:02 UT and finished at 17:08UT 28/10. Period is probably >13h at amplitude of 0.1mag +/-0.05mag. Precision is borderline, between 0.02-0.03mag . With the moon getting brighter, it may be difficult to improve even with a long integration time of 10 min.
Julian [2006-10-29 10:29, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This one is a going to be a tough object. Its currently at 16.6 mag and receeding. From last night observation started at 09:54UT and finished at 16:40 UT 27/10, the curve is gradually declining by about 0.05 mag with a lot of scatter. +/-0.05 mag.
Will attempt another session tonight and increasing integration time to 10min. Hope this will get a better SNR.
Julian [2006-10-28 08:54, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed from 09:59 UT to 15:33 UT 12/10. No clear period derived. Further observations required.
Julian [2006-10-13 01:28, Blue Mountains Obs]

(3773) Smithsonian (Finished) [Add new note]
· This one has been well done by Bob Stephens from GMARS and Santana. A unique period, good coverage, no significant deviation seen. It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-10-23 08:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Bob Stephens has observed (3773) from GMARS on the last night:
http://www.asu.cas.cz/~asteroid/3773_gmars_061015.png
His data are pretty good, they refine the period to 6.9804 h, but show a higher amplitude than the previous two nights taken from GMARS three weeks ago. It is apparently just amplitude-phase effect. One more night covering one full period will quite likely finish it. Bob will not be able to take such data during next six days at least, so if someone could help out and take one 7-h long session, it would be useful.

Cheers, Petr [2006-10-15 20:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Obtained 5 nights of observations from September 13 to 24 at Santana and GMARS Observatories. The period is well established at 6.98 hours with no deviations seen. [2006-09-24 18:18, Santana]

15415 Rika (Finished) [Add new note]
· This one has been done well by Gabo and Marek from Skalnate Pleso. Unique period, double coverage, no significant deviation,
http://www.asu.cas.cz/~asteroid/15415.png
It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, guys.

Cheers, Petr [2006-10-18 13:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object observed from 18:53 UT to 22:18 UT, October 14. Gabo [2006-10-15 03:46, SkalnatePleso] [Remove]

· This object observed from 17:15 UT to 03:13 UT, October 11/12. Gabo [2006-10-12 03:19, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· More than full period (P=6.37+/-0.002 hours) covered with 1 mag amplitude.
Marek [2006-10-11 08:35, SkalnatePleso] [Remove]

· This object observed from 23:15 UT to 03:25 UT, October 9/10. Gabo [2006-10-10 03:34, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

1998 FH 115 (Finished) [Add new note]
· This object was observed on six nights at Skalnate Pleso Obs. Derived period of 16.6062 +/- 0.0008 h is unique, no deviations seen and its coverage is sufficient for BinAst survey. Object is finished now, see a composite light-curve:

http://www.asu.cas.cz/~asteroid/12081.png

Nice work, Marek, Gabo & Michal!

Peter K. [2006-10-18 11:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object observed from 17:38 UT to 03:38 UT, October 17/18. Gabo [2006-10-18 03:43, SkalnatePleso] [Remove]

· This object observed from 17:20 UT to 03:40 UT, October 16/17. Gabo [2006-10-17 03:40, SkalnatePleso] [Remove]
Message sent to BinAstPhotSurvey conference

· Observing from 00:00 UT in a good weather conditions. Michal [2006-10-06 00:14, Skalnate Pleso]

· Observing from 00:15 UT. Partly cloud coverage at the moment, but sky clears up a bit. Expecting to take a few hours session, if possible. Michal [2006-10-03 00:18, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Observing from 00:30 UT. Sky condition good at the moment, but expecting deterioration in quality in the next few hours. Michal [2006-10-02 00:46, Skalnate Pleso]

· Observing from 19:00 UT. Sky clear. Expecting to take 8 hours session. Michal [2006-09-30 19:00, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· This object observed from 19:08 UT to 21:42 UT, September 26. Gabo [2006-09-26 22:18, Skalnate Pleso]

· This object observed from 18:40 UT to 23:47 UT, September 24. Gabo [2006-09-25 06:57, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· This object observed from 18:56 UT to 00:16 UT, September 23/24. Gabo [2006-09-24 00:40, Skalnate Pleso]

(3258) Somnium (Finished) [Add new note]
· Julian has found a problem with his light-curves and his re-reduced data fit well with the rest. The period is 5.3378 +/- 0.0002 h and unique. As there are no no deviations greater than 0.04 mag visible this object is finished.

http://www.asu.cas.cz/~asteroid/03258.png

Peter K. [2006-10-17 12:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Short run (only two hours long) from Modra Obs. last night (Oct.15/16) is consistent with amplitude of 0.78 mag. Hope they will get another longer run soon. Don't know what is wrong with Julian's two hight-amplitude nights.

Peter K. [2006-10-16 12:02, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another 2 sessions done. 1st session started on 11:31 UT and finished at 18:25UT 13/10 . This one showing an interesting light curve with amplitude of >2.2 mag. 2nd session started 09:26UT and finished at 11:52UT 14/10 cut short by cloud. The amplitude appear to have dropped to 1.6mag (light curve too short to be sure). Next couple of nights might be a wash out for me. Any help will be great.
Julian [2006-10-15 07:36, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Session started at 10:09UT 11/10 and finished 18:20 UT 11/10. [2006-10-13 00:44, Blue Mountains Obs]

· Session started at 12:57 UT and finished at 18:24 UT 10/10. No deviation detected . Period refined to 5.33+/- 0.01h. I will attempt another night. Data sent to Peter/Petr [2006-10-10 23:58, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started on this target at 10:00 UT 09/10 and session end at 18:13 UT. Target is bright enough even when moon is close by. Initial period is 5.32+/- 0.03h with amplitude of 0.80mag. [2006-10-10 01:09, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

(2910) Yoshkar-Ola (Finished) [Add new note]
· Julian has established a main period of 3.4233 h for this one well. His 1st (shorter) session doesn't fit with the rest of the data, but we don't consider it to be worth to pursue further. We close it for the Survey. A note put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-10-06 08:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· 2 more nights on 3/10 and 4/10 with 4 hour and 9 hour long session both showing a clean 0.38 mag amplitude data. This may be a non detection of binary
after all.
Julian [2006-10-05 11:26, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Done a third night to confirm the amplitude. Started at 10:13UT 27/09 and finish at 18:46 UT. Period is 3.4235h+-0.0005h. Amplitude were 0.48mag then dropped down to between 0.36 to 0.38 mag for 3rd and 2nd session resp. Data sent to Petr/peter. [2006-09-28 11:22, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· observation were done at 10:11UT 24/09 for 6 hours. Period is shown to be 3.43h with a huge amplitude of 0.5mag. Something not seen for a while.
Julian [2006-09-25 12:31, Blue Mountains Obs]

· Started observation of this new target lastnight 24/09 from 16:12 UT. Session was for 3 hours. [2006-09-23 21:48, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

1634 Ndola (Finished) [Add new note]
· Nice work, David, on the slow rotator. Yes, we may call it done for the BinAstPhotSurvey. I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-10-04 08:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:44UT to 18:38UT in average conditions, damp sky and bright moon resulting in somewhat noisey data. Data fits well with the 64.23 +/- 0.05hr solution (3 night running) so I might call this one done with 80% phase coverage including some overlaps. [2006-10-03 22:19, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:52UT to 18:48UT in good conditions. Long period still fits and period refined to 64.13 +/- 0.07h with an amplitude of 0.4 +/- 0.02mag [2006-10-01 03:12, HuntersHill]

· Observed from 11:09UT to 18:34UT in good conditions. Data fits the latest curve confirming a Bimodal period of 64.2 +/- 0.2 hrs with an amplitude of 0.4 +/- 0.02mag. [2006-09-30 02:15, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:10UT to 18:56UT in reasonable conditions. The data showed a continuous decrease in magnitude of 0.24mag over the entire session and does not fit at all with my last derived period. Back to the drawing board....

Edit: I have a rough monomodal fit at 32.1hrs amplitude 0.4mag. It's not pretty but it is the best I can do for the moment. Bimodal at 64.2 hrs is plausable. [2006-09-28 23:11, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:07UT to 18:52UT with thin cloud. I've been able to finally piece something together that looks liek a reasonable curve and derived a period of 29.34 +/- 0.06hrs with an amplitude of 0.2 +/- 0.02mag [2006-09-27 22:30, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:21UT to 19:01UT in reasonable conditions. The data showed a continual brightening of 0.15 mag over the entire session. I think it is safe to say this one has a period in excess of 32 hrs. A best fit with the data starts at 39 hrs. [2006-09-26 22:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:20UT to 18:45UT in good conditions. This third night allowed Canopus to get a very good fit (monomodal) at 7.7hrs. The corresponding bimodal curve at 15.4 hrs seems to fit but looks a little 'rough' due to the noisiness of the first sessions data. Other periods at 11 and 14 hrs also indicated. Plot has an amplitude of around 0.08 +/- 0.01 mag.

More data required. [2006-09-25 22:56, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:35UT to 17:10UT when closed by Cloud. This part of the data indicates a possible low amplitude maxima. Indications are for a Bimodal period of not less than 24hrs. [2006-09-24 02:32, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 12:39UT to 19:10UT in average conditions. Data shows a somewhat noisey low amplitude decline over the 7 hr period with errors approx 0.01mag. Indications are that the period exceeds 28hrs. [2006-09-17 22:03, HuntersHill] Message sent to BinAstPhotSurvey conference

2430 Bruce Helin (Finished) [Add new note]
· Adrian has shown this one to be of a period near 128 h with their Modra data (preliminarily linked). David has found a general consistency of his relative data taken from Hunters Hill with the period as well. The long period of the target has been well established. We close it for the BinAstPhotSurvey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Adrian and David.

Cheers, Petr [2006-10-02 17:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 13:04UT to 18:52UT in good conditions. Period holding at 126.72 +/- 0.05hrs. Another part of the gap in the curve has been covered. [2006-09-30 02:36, HuntersHill]

· Observed from 13:33UT to 19:03UT in reasonable conditions. Data fits well with 126.72 +/- 0.05hr solution. Amplitude of 0.65 +/- 0.02mag. 70% phase coverage has been acheived with some overlap. [2006-09-28 23:26, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 1319UT to 18:58UT in cloudy conditions. Data still fits with 126.7hr curve. [2006-09-27 22:41, HuntersHill]

· Observed from 13:14UT to 18:54UT in reasonable conditions. Data still fits with the long period. Some adjustments made to the delta V to a couple of sessions moves the period a little to 126.86 +/- 0.06hrs.

Still a lot of gaps to fill in but this is no longer a BINASTPHOT target of interest. Anyone wishing to contribute some data would be most welcome. [2006-09-26 23:23, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 14:15UT to 18:51UT (first hour obscured by a bright star). Slowly filling in the gaps in the curve with the period apparently stabilising on 126.7hrs. Amplitude indicated is approx 0.65 +/- 0.02 mag. [2006-09-25 23:09, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 13:22UT to 18:01UT when closed by cloud. Data fits with 126.7 +/- 1hr period (bimodal) identified with Adrians 3 linked nights with an amplitude of 0.5 +/- 0.02 mag. [2006-09-24 02:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· Third night data linked indicate 126-127 h period (supposing two maxima). With its supposed size it is close to tumbler region. Adrian [2006-09-23 04:34, Modra]

· I have obtained another run. Only the latest two are linked, which is not enough for P determination. It can be even 127 h long. I should try to observe and link tomorrow if weather permits. Adrian [2006-09-22 04:01, Modra] Message sent to BinAstPhotSurvey conference

· Observing and hoping I could continue tomorrow and link data (P is probably 30 h or more).
Adrian [2006-09-21 03:24, Modra]

· Observed from 13:46UT to 19:00UT in average conditions. Long period indicated. Best fit to date around 30 to 34 hrs with an amplitude under 0.2 +/- 0.01mag. [2006-09-17 22:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 13:45UT to 17:34UT. Long period still indicated, possibly around 27hrs. [2006-09-17 04:28, HuntersHill]

· Observed from 15:47UT to 19:08UT. Good conditions, long period still indicated. [2006-09-16 11:15, HuntersHill] Message sent to BinAstPhotSurvey conference

· I can confirm similar behaviour as I observed this object too. Unfortunately, it was during last week on Sept 10 early in the morning, and it was quite a short run of about 2.5 h. I noticed just a steady and slow increase in brightness (0.06 - 0.07 mag). So I realized that it was a slow rotator (with low priority here) and linked data would be very useful (or continuous data from various longitudes). Adrian [2006-09-12 19:55, Modra] Message sent to BinAstPhotSurvey conference

· Observed from 13:58UT to 19:25UT in average conditions. Somewhat brighter than expected.

Plot shows a continual decline over most of the session with a drop of 0.09 mag, flattening in the last portion of the session indicating a possible minima. [2006-09-12 00:54, HuntersHill] Message sent to BinAstPhotSurvey conference

(2259)Sofievka (Finished) [Add new note]
· Three linked nights by Peter K. here have confimed that it is a slow rotator. An U=2 solution of 37.8 h. A refined period estimate will be made after Peter links his fourth (and last) night he got for it. Nevertheless, we are closing the slow rotator for the Survey now. A note added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Peter, Marek and Gabo.

Cheers, Petr [2006-10-02 16:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Unlinked sessions available for this one so far (four nights by Gabo from Skalnate Pleso, two nights by Peter K. from here, and one session by Julian from Leura all show a little or no variation. The longest (7.6 h) and highest quality session by Gabo of Sept 13.0 indicates that it is actually a long period object. More unlinked data wouldn't be of a use for the low amplitude, long period object, so don't bother with it unless you link your sessions. (Peter will link his two sessions on a photometric night.)

Petr [2006-09-18 14:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started observing this target at 16:42 UT 16/09 . Only 2 hours of data obtained. Not sure whether this is useful or not . It is the last 2 hours of the night run after Mendoza 3868. The 2 hours showed a very low amplitude of 0.05 mag with an upward trend. Data sent to Petr/Peter. [2006-09-16 10:37, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· This object observed from 20:27 UT to 03:00 UT, September 13/14. Gabo [2006-09-14 03:17, Skalnate Pleso]

· This object observed from 19:20 UT to 03:00 UT, September 12/13. Gabo [2006-09-13 03:16, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· This object observed from 20:00 UT to 03:00 UT, September 11/12. Gabo [2006-09-12 03:16, Skalnate Pleso]

· This object observed from 23:30 UT to 02:55 UT, September 10/11. Gabo [2006-09-11 03:25, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

(4080) Galinskij (Finished) [Add new note]
· This target was observed on 4 nights from Skalnate Pleso Obs.: period 7.36 h, amplitude 1.0 mag, multiple coverage, no significant deviations seen. It's finished now.

http://www.asu.cas.cz/~asteroid/04080.png

Nice work, Marek at al.!

Peter K. [2006-10-01 14:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Asteroid shows 7.36 h period with 0.99 mag amplitude. I think it can be finished.
Marek [2006-10-01 13:25, Skalnate Pleso]

· Observing from 19:25 UT. Sky clear. Hope good conditions for catching whole period. Michal [2006-09-29 19:34, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Observing from 22:00 UT. Cloud coverage is droping off at the moment. Expecting good conditions for the next 6 hours.Michal [2006-09-28 22:13, Skalnate Pleso]

· Observing from 23:10 UT, but sky quality poor and changeable.
Cs trans at 5000m aprox. Not expecting great improvement, but some of the data will be hopefully usable. Michal [2006-09-27 23:36, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Observing from 23:35 UT. Expecting a good weather conditions for the next 5 hours.Michal [2006-09-22 23:41, Skalnate Pleso]

(4335) Verona (Finished) [Add new note]
· This one has been finished after 2 nights from here -- unique period solution of 3.5943 +/- 0.0001 h, multiple coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/04335.png
It is finished for the Survey.

Peter K. [2006-09-30 17:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:30 UT, Sept. 29. Peter K. [2006-09-29 21:04, Ondrejov]

· Observing from 22:45 UT, Sept. 26. Peter K. [2006-09-26 23:54, Ondrejov] Message sent to BinAstPhotSurvey conference

(11131) 1996 VO30 (Finished) [Add new note]
· This one has been done well with three nights by David from Hunters Hill and one night by Michal and Marek from Skalnate Pleso. Unique period solution of 2.7890 +/-0.0005 h, multiple coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/11131.png
It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2006-09-27 08:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 09:53UT to 17:16UT. Period refined to 2.7884 +/- 0.0007hrs with an amplitude of 0.12 +/- 0.02mag. No deviations detected.

Data sent to Petr and Peter to determine if the target is done. [2006-09-25 23:20, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:10UT to 17:24 when closed by cloud (and rain - lucky I woke up when I did). Data slightly noisey but not unexpected given it's low amplitude and have good agreement with the first nights period. 2.787 +/- 0.002 hrs with an amplitude of 0.1 +/- 0.01. The second peaks amplitude is much smaller. [2006-09-24 01:50, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observing from 19:30 UT. Hope to catch whole period. Conditions very good. (Mesage delayed due to connection problems.)Michal [2006-09-22 21:03, Skalnate Pleso]

· Second half of session doomed by wind. Some data was recoverable indicating a period of 2.87 +/- 0.03hrs but other fits are also possible. Amplitude of 0.1 +/- 0.02mag indicated. [2006-09-20 22:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observation started at 10:00UT in average and windy conditions and I do not expect a full session as the radar shows cloud on it's way and strong winds are predicted for tommorrow. As a consequence, imaging limited to BIN 2x2.

Early indications are for a period around 3 hrs with an amplitude of 0.1 +/- 0.01mag [2006-09-20 12:17, HuntersHill] Message sent to BinAstPhotSurvey conference

3868 Mendoza (Finished) [Add new note]
· After a long campaign that span for nearly 3 months, this object is finally marked as close. Although there are 4 attenuations caught during that time ( 5th is a suspect in the 20/09) there appear to be no solution for the Porb with the Pprim to be well established as 2.7711 hr.
I will write an article for submission to MPB in due course. I may need to get the data from those that has worked with this target. Please email me privately at julianoey1@optusnet.com.au [2006-09-23 07:11, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· 3 more nights of observations done (18/09, 19/09, 20/09 UT) each about 5 hours. [2006-09-21 11:56, Blue Mountains Obs]

· 2 nights of good weather. 16/09 and 17/09 with 6 and 5 hours respectively. The later was cut short by a bright star. Will continue again tonight. [2006-09-18 06:16, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I am returning to this target for now. started at 11:47 UT 15/09. Session lasted 4 hours. [2006-09-16 10:41, Blue Mountains Obs]

· further 2 nights sessions on 02/09 (3hours) and 03/09 ( 6 hours). Data sent to Petr and peter. [2006-09-04 09:43, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· completed a 3 hours observation last night started at 12:12 ut Sep 01. Continue on tonight hopefully the weather improves [2006-09-02 12:37, Blue Mountains Obs]

· Julian has caught another attenuation on Aug 18.5, see
http://www.asu.cas.cz/~asteroid/3868_060818_leura.png
This one is a complex one, we have a couple ideas what it might be but the data are not sufficient to check or reject them. It appears to have a rather long orbital period. Julian is pretty sure that the data are good. A comparison with other data he took during this lunation, which fit well with little deviations:
http://www.asu.cas.cz/~asteroid/3868_shortpc_060811_20.png

For completness, the pictures of the previous two partial attenuations caught in July by Julian and Russ follow:
http://www.asu.cas.cz/~asteroid/3868_060712_leura.png
http://www.asu.cas.cz/~asteroid/3868_060729_shedofscience.png

Petr [2006-08-23 12:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· started tonight 08:21UT 20/08. Expected for a full session.
Julian [2006-08-20 10:51, Blue Mountains Obs]

· 3 nights on 14/08,16/08 and 18/08 with 3h,7.5h and 6.5h sessions respectively. Unfortunately the 16/08 session is badly marred with interlopping stars rendering it useless. Tonight started at 08:51 UT 19/08 . Hope the background stars are more manageble.
Julian [2006-08-19 11:50, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· 2 nights on 11/8 and 12/8 UT taken. 8 hours and 3 hours respectively. Data sent to Petr and Peter. Tonight started at 09:17 UT 14/8.
Julian [2006-08-14 09:44, Blue Mountains Obs]

· I'm posting this to keep the group informed on situation with this binary candidate.

There are 19 good nights for 3868 Mendoza so far (typical length >4 hours, but some are shorter and/or with gaps due to severe star contaminations); 7 by Julian from Leura, 4 by David from Hunters Hill, 4 by Russ from Shed of Science Obs., and 4 by Gianluca et al. from Campo Catino. The data have revealed a unique period of 2.7710 h, see
http://www.asu.cas.cz/~asteroid/3868_all.png
but there occured two partial attenuations:
http://www.asu.cas.cz/~asteroid/3868_060712_leura.png
http://www.asu.cas.cz/~asteroid/3868_060729_shedofscience.png
Both Julian and Russ checked the deviating points in their respective sessions and they found no observational problem there. So, it is a binary candidate, though the available data (which are of a limited coverage; only limited data were taken outside of Australia) don't allow to get a solution for Porb so far. Julian et al. plan to go on with it to hopefully catch more attenuations.

Clear Skies, Petr [2006-08-10 13:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 09:36 UT lastnight 07/08 and finished at 16:24 UT. Continued on tonight at 10:05 UT for another session fighting the moon and little faint stars again. [2006-08-08 12:49, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I am back on this target again tonight started 08:15UT. Looks like weather is going to hold for full session. Although the moon may be aproblem but object is pretty bright. [2006-08-06 07:59, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Observed full session from 8:55UT to 17:08UT in reasonably good conditions. Crowded field but only a few star removals and field was not perfectly flat due to moon.

Data sent to Petr and Peter. [2006-08-06 01:26, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started session lastnight 29/07 at 11:53UT for 6.5 hours. Continue on tonight 30/07 at 09:08 UT hopefully for a full session of 8 hours. [2006-07-30 10:45, Blue Mountains Obs]

· Started run about 3:30 UT on 7/29. Should be able to go until around 8 UT. Temp around 32C (86F) tonight! Russ [2006-07-29 05:14, Shed of Science] Message sent to BinAstPhotSurvey conference

· glad to be back on this target after a long stretch of bad weather. With luck it will hold for another night. Nearly 8.5 hours session obtained started at 09:55UT 28/07 . Good data of <0.01 mag error with tiny stars eliminated with SBGone. Period of 2.771h observed with no apparent deviation. [2006-07-29 01:02, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Starting a run on 7/27 around 4 UT. Should be able to cover it until about 8 UT. Russ [2006-07-27 04:14, Shed of Science]

· Finished a longer run on 7/23. Sent data off to Peter and Petr. Russ [2006-07-24 04:51, Shed of Science] Message sent to BinAstPhotSurvey conference

· Completed a run last night 7/18. Lots of closely spaced background stars. [2006-07-19 01:25, Shed of Science]

· Most of the Julian's last night data fit well with the main 2.77-h period (but the second period is still not unique). There occured however, an attenuation about 0.18-mag deep before the end of the session. See following pictures
http://www.asu.cas.cz/~asteroid/3868_all.png
http://www.asu.cas.cz/~asteroid/3868_shortpc.png
http://www.asu.cas.cz/~asteroid/3868_longpc.png
More long sessions are needed to catch more attenuations as well as to get a solution for the long period, low amplitude variation.

Cheers, Petr [2006-07-14 14:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started lastnight (12/07) at 11:36 UT. Session end at 18:15 UT. Good results with errors 0.01-0.02 [2006-07-13 12:25, Blue Mountains Obs]

· The 5+ hour long run by Julian from the last night joined in. The 2.77-h period is well established. With the accumulating good data, we are beginning to see some pattern in the deviations. For search of a second period, I am using only sessions at least 5 hours long and where there were no problems reported. There are four such good long sessions now, three by David and one by Julian. A possible second period seen in them is about 14.57 h. The lightcurve decomposited with the 2.77 and 14.57 h periods see following pictures:
http://www.asu.cas.cz/~asteroid/3868_all.png
http://www.asu.cas.cz/~asteroid/3868_shortpc.png
http://www.asu.cas.cz/~asteroid/3868_longpc.png
The solution for the second period is not unique, more long sessions with errors not higher than 0.02 mag are needed. If/when the second period is confirmed, the asteroid will become a possible/probable binary. The four best sessions don't show a mutual event, so it is not a regular binary detection so far.

Cheers, Petr [2006-07-11 12:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· a 5.5 hours taken starting at 11:25 UT . good result with <0.01 errors. Sent to Petr for addition. [2006-07-11 01:30, Blue Mountains Obs]

· Three nights by Marek Husarik and his colleagues from Skalnate Pleso joined in. They are relatively short sessions (2-3 hours), so their interpretation is somewhat less certain, but the first and the third night fits nicely with the 2.769-h period. The second night fits poorly, but since it is only 2.1-h long, it is hard to tell what the deviations are.
http://www.asu.cas.cz/~asteroid/3868.png

Long sessions with errors <0.02 mag will be needed in the next lunation.

Cheers, Petr [2006-07-10 14:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· The current dataset with the two additional nights by David shows the 2.77-h period (U=2), see
http://www.asu.cas.cz/~asteroid/3868.png
There are apparent some deviations (but no good period for them apparent so far), their nature is not understood yet, so more long sessions with errors <0.02 mag will be needed in the next lunation.

Clear Skies, Petr [2006-07-09 14:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Complete session with good weather, crowded field (thank goodness for StarBGone) observed from 11:25UT to 19:14UT with 0.01mag errors. I cannot resolve a unique period as yet.
Data sent to Petr and Peter. Weather has turned foul so this is likely the last session on this object this lunation. [2006-07-09 01:26, HuntersHill] Message sent to BinAstPhotSurvey conference

· Another full session observed from 11:26UT to 19:35UT. More complete data this time, StarBGone was required for several background stars and the plot at 2.77hrs shows what looks like overlapping periods.

Data sent to Petr and Peter. [2006-07-08 00:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· David's data indeed don't fit well with a single period. A poor fit is for a period of 2.77 h, see
http://www.asu.cas.cz/~asteroid/3868.png
but there are a number of deviations. More long sessions (best if linked) are needed to resolve this one.

Clear Skies, Petr [2006-07-07 08:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Full session observed from 11:06UT 19:51UT with a large gap due to grossly wind affected images. Remainder of the data was still good but still have no idea what to make of the data. Maybe a tumbler or a possible binary!

Data sent to Petr and Peter. [2006-07-07 01:55, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 11:13UT to 18:54UT but last part of session severely affected by wind (event though SNR shows up ok!)

Still can't make anything of the data. Sent to Petr and Peter. [2006-07-05 22:45, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:18UT to 16:34UT before cloud and extreme dew ended the session (I had to mop out the observatory). Still can't make any sense of the data. Maybe one of these nights I will get a full unaffected run. [2006-07-04 22:53, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started new target with observations from 11:57UT to 17:18UT however cloud/dew significantly affected the SNR so no reliable period could be extracted though a period around 4 hours may be viable.
Forcast at Hunters Hill is for poor weather for the next few days so assistance on the target would be welcome. [2006-06-29 22:32, HuntersHill] Message sent to BinAstPhotSurvey conference

1314 Paula (Finished) [Add new note]
· Four sessions by Gabo and Marek from Skalnate Pleso and one session by Peter K. from here have finished this one well: Unique period, good coverage, no deviation seen:
http://www.asu.cas.cz/~asteroid/1314.png
I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys!

Cheers, Petr [2006-09-21 08:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started and planing to cover one missing minimum (to 22:15 UT). It should be finished then. Peter K. [2006-09-20 21:03, Ondrejov]

· Observing from 18:40 UT. Cloud coverage seems to be unstable tonight.A 3/8 Ac in two layers based 500m and 1000m above station at the moment. Catching the whole period probably could not be guaranted for the night.Situation unpredictable. Michal [2006-09-18 18:58, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· This object observed from 19:31 UT to 21:25 UT, September 16. Gabo [2006-09-16 21:59, Skalnate Pleso]

· Two nights show nice 5.949 h period with 0.82 mag amplitude.

Marek [2006-09-16 09:50, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· This object observed from 18:32 UT to 00:28 UT, September 15/16. Gabo [2006-09-16 02:08, Skalnate Pleso]

· This object observed from 18:38 UT to 02:01 UT, September 14/15. Gabo [2006-09-15 03:12, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

2590 (Finished) [Add new note]
· Jozef and Stefan from Modra have done this one well: unique period of 15.59 h, no deviation seen. (For periods longer than 10 h, a full coverage of the period is not required within the BinAstPhotSurvey.) See
http://www.asu.cas.cz/~asteroid/2590.png
It is finished for the Survey. I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Jozef and Stefan.

Cheers, Petr [2006-09-19 06:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· observing tonight from 19:30, the weather still holds. 2430 could also be worked later, from 0:00 UT, however that still does not look very promissing. Jozef, Stefan. [2006-09-14 22:02, Modra]

· obtained another run (20:30-02:30 UT). Jozef [2006-09-14 03:57, Modra] Message sent to BinAstPhotSurvey conference

· planning to observe this target 19:30-2:30 UT. Jozef [2006-09-12 19:16, Modra]

· starting a new object now, weather looks good, possibly will attend to Efimov later this night (23 UT). Jozef [2006-09-11 19:41, Modra] Message sent to BinAstPhotSurvey conference

(12735) 1991 VV1 (Finished) [Add new note]
· Petr agrees that it's time to close this one. The great preponderance of data indicate nothing unusual and there are other targets in more critical need.

I'll be putting a paper together for the Minor Planet Bulletin. If you contributed data, please send me the names/institutions involved.

brian@MinorPlanetObserver.com

Thanks! [2006-09-18 17:31, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Observing from 19 UT and hoping in full-night run, but it depends on the weather outside. Peter K. [2006-09-17 22:45, Ondrejov]

· Observing from 19 UT and hoping in full-night run, but it depends on the weather outside. Peter K. [2006-09-17 20:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 08:48UT to 15:12 UT in good conditions. Data is pretty noisey and a large gap due to bright field star. [2006-09-16 11:32, HuntersHill]

· Observed from 09:41UT to 15:15UT in cloudy conditions. Major deviation in curve noted. 2/3rd of the data coincides with a background star subtraction. The other 3 points may have been affected by the subtract area but it is a large deviation from the curve (0.15mag).

It would appear the deviation is an artifact of StarBGone. Data sent to Petr and Brian for analysis [2006-09-14 22:57, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observing from 19:20 UT and expecting 5 hours long run. Peter K. [2006-09-13 21:03, Ondrejov]

· New data by Adrian and Jozef from Modra (3 nights), by Peter K. from here (2 sessions), and by David from Hunters Hill (2 nights) taken during Sept. 1 to 12 joined with the previous four Brian's nights. The main period has been nailed down well: 3.2606 h, see
http://www.asu.cas.cz/~asteroid/12735.png
Most data fit well, prominent deviations have been observed on the night Aug. 29.3 by Brian (reported here before) and on the night Sept. 11.5 by David (the four points decreased by 0.08 mag), see
http://www.asu.cas.cz/~asteroid/12735_060829_pdo.png
http://www.asu.cas.cz/~asteroid/12735_060911_huntershill.png
David sees no observational problem with the four decreased points; they may be a shallower, possibly partial event. We will see what more data show.

Cheers, Petr [2006-09-13 07:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started about 0300 UT (Sep 13). Should go to about 0815.

First clear skies (some haze still but usable) since Sept 5. Before that, Aug. 29-31. Before that - July 28! August was literally washed out. [2006-09-13 04:04, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Observed from 09:07UT to 15:31UT in increasingly humid/foggy conditions. Data appears to fit well with last nights and has been sent on to Petr and Peter for analysis. [2006-09-12 22:55, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observing from 19:05 UT and expecting 5.5 hour long run. Peter K. [2006-09-11 23:46, Ondrejov]

· Observed from 09:27UT to 15:29UT in average conditions. General fit to 3.24hr period.

Data sent to Petr and Peter. [2006-09-11 22:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observing from 19:05 UT and expecting 5.5 hour long run. Peter K. [2006-09-11 21:39, Ondrejov]

· Observations possible for this asteroid tonight, but not yesterday as it was in front of many stars. Adrian [2006-09-10 22:44, Modra] Message sent to BinAstPhotSurvey conference

· We started a observation right now. The weather seams to be fine. Zuzana [2006-09-02 19:39, Skalnate Pleso]

· Planning a run tonight at 19:30, thin clouds could be a problem later.Jozef [2006-09-02 18:53, Modra] Message sent to BinAstPhotSurvey conference

· Started at 19:30 UT but some cirrus may be a problem later tonight. Peter K. [2006-09-01 20:03, Ondrejov]

· Clouds came in about an hour after I started. [2006-09-01 07:29, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Starting this a little late (05:00 UT) with hopes the clouds will stay away. [2006-09-01 04:55, PalmerDivide]

· Brian Warner has found this one showing a deviation that is suggestive of a binary nature, see
http://www.asu.cas.cz/~asteroid/12735.png
Though the main period itself needs to be nailed down with more data, the progressing attenuation towards the end of the session Aug. 29.3 appears to be a real feature. Brian will be probably clouded out during the next couple nights, and observations from other longitudes would be useful as well, so I encourage you who are able to observe the target with errors not greater than 0.03 mag to contribute so that the main period is nailed down and more attenuations detected.

Cheers, Petr [2006-08-31 16:57, Ondrejov] Message sent to BinAstPhotSurvey conference

12071 Davykim (Finished) [Add new note]
· Well done by David from Hunters Hill: unique period of 3.548 +/- 0.002 h, good coverage, no significant deviation. Finished for the Survey. I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David.

Cheers, Petr [2006-09-18 13:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:08UT to 17:45UT. Period refined to 3.458 +/- 0.002hrs with an amplitude of 0.30 +/- 0.02mag. No deviations detected.

Data sent to Petr to determine if the target should be finished. [2006-09-17 04:25, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:14UT to 19:14UT in good conditions. Period of 3.55 +/- 0.02 hrs established and no deviations noted as yet. First night indicated no deviations - just a narrowing of the amplitude. Taking one more night just in case! [2006-09-16 11:18, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11.11UT to 19:19UT. Cloudy conditions and a very bright (mag 4 or 5) field star that the target approached until dawn. This lead to pretty ordinary data and the targets period amplitude narrowed the closer it got to the bright field star BUT it did reveal a definitive period (bimodal) of 3.48 +/- 0.03hrs with an amplitude in the vicinity of 0.3 +/- 0.02mag. [2006-09-14 23:25, HuntersHill] Message sent to BinAstPhotSurvey conference

3913 Chemin (Finished) [Add new note]
· This one has been well done by David from Hunters Hill.
Unique period, good coverage, no prominent deviation. (A few marginally deviating points are not likely to be something special.) It is finished for the Survey. I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
with a link to the David's page with the result.

Good work, David.

Cheers, Petr [2006-09-13 06:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 08:57UT to 15:37UT in increasingly foggy conditions. Data fits well with existing period and no deviations detected.

Data sent to Petr and Peter for analysis [2006-09-12 22:56, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 09:00UT to 17:00UT in average conditions. Some bad points - bad star subtract and odd data near a bright (but not blooming) field star toward the end of the night. Some gaps due to pointing problems.

Data does fit the exiting 3.408 period well and indicates a couple of interesting points though the errors are largish. 3.4078 +/- 0.0004hrs with an amplitude of 0.22 +/- 0.03mag (avg)

Data sent to Petr and Peter. [2006-09-12 00:19, HuntersHill] Message sent to BinAstPhotSurvey conference

· This object observed from 19:30 UT to 22:00 UT, September10. Gabo [2006-09-11 03:21, Skalnate Pleso]

· Observed from 9:23UT to 14:30UT when cut short by cloud. Average observing conditions. Period of 3.408 +/- 0.002 with an amplitude of 0.17 +/- 0.03mag. [2006-08-31 00:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 9:22UT to 15:44UT when session cut short due to cloud.

Period refined a little to 3.405 +/- 0.003hrs with an amplitude of 0.22 +/- 0.03mag. [2006-08-30 03:24, HuntersHill]

· Observed from 9:04UT to 17:50UT in good conditions. Data reveals a period of 3.402 +/- 0.003hrs with an amplitude of 0.22 +/- 0.03mag.

Might be an interesting target but then again could be just a few wayward points. More data required. [2006-08-29 02:22, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 9:09UT to 10:29UT before session curtailed by cloud. Data indicates a possible period in the order of 2.5 hrs with an amplitude around 0.15mag.

Conditions in Canberra are not expected to improve at least for the next few days so this might be a good target for someone to take on. [2006-08-26 23:35, HuntersHill] Message sent to BinAstPhotSurvey conference

(70091) 1999 JN93 (Finished) [Add new note]
· David has shown that this one has a long period. Its observing conditions are worseing and it looks unlikely that more (linked) data will be taken for it, so we are closing the target for the Survey. I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
with a link to the David's page with the result.

Petr [2006-09-06 09:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 9:14UT to 17:42UT in good conditions. Object is fainter than expected resulting in 0.03-0.04mag errors. However, this appears to be a very long period object as the brightness decreased steadily by 0.22mag over the 8.5 hour observing period. As such I would not expect this object to have a period less than 32hrs. [2006-09-01 00:46, HuntersHill] Message sent to BinAstPhotSurvey conference

2510 Shandong (Finished) [Add new note]
· Just confirming the David's message: Yes, this one has been done well with four nights from his station. Unique period, good coverage, no deviation. Finished for the Survey. I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
with a link to the David's page with the result.

Well done, David.

Cheers, Petr [2006-09-05 09:36, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:51UT to 19:32UT in good conditions. Period refined to 5.9463hrs +/- 0.0003hrs, amplitude 0.44 +/- 0.01mag.

No deviations detected. I think this one is done. [2006-09-04 21:59, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:04UT to 19:28UT in good conditions. Period refined to 5.947 +/- 0.002hrs with an amplitude of 0.44 +/- 0.01mag. No deviations detected.

Data sent to Petr and Peter for analysis. [2006-08-31 23:59, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed as a secondary target from 11:10UT to 15:35UT when extreme dew generated either fog or cloud cutting the session short.

Period refined to 5.951 +/- 0.006hrs with an amplitude of 0.44 +/- 0.01mag. [2006-08-30 03:11, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 14:52UT to 19:45. Based on a good monomodal curve at 2.9 hrs this target has a likely period of around 5.8hrs with an amplitude of 0.44 +/- 0.01 mag. [2006-08-29 01:53, HuntersHill] Message sent to BinAstPhotSurvey conference

(2943) Heinrich (Finished) [Add new note]
· This one has been well done by Don from Carbuncle Hill, by Leos, Jozef and Juraj from Modra, and by Peter from here. A unique solution, good coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/2943.png
It is finished for the Survey. Note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys!

Cheers, Petr [2006-09-02 10:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20:15 UT. Peter K. [2006-08-31 21:52, Ondrejov]

· We observed MP 26/27.8. from 21 UT to 02 UT. Good weather. Juraj, Leos [2006-08-27 10:55, Modra] Message sent to BinAstPhotSurvey conference

· I'll be starting this around 03:15, Aug23 UT.
Don [2006-08-23 01:25, CarbuncleHill]

· I'll be starting this one around 03:40, Aug 22 UT.
Don [2006-08-21 23:49, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· We'll be doing this from 21 UT. Leos, Jozef [2006-08-19 20:23, Modra]

· I should be doing this at 03:40, Aug 19 UT.
Don [2006-08-19 00:26, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Last night we were lucky to obtain some data on this one (22-01 UT), interrupted by weather. Leos, Jozef. [2006-08-18 19:57, Modra]

· Doing a second run on this tonight.
Don [2006-08-18 01:55, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting this one tonight.
Don [2006-08-17 02:25, CarbuncleHill]

(1494) Savo (Finished) [Add new note]
· Four nights by Gianluca Masi supported with one shorter night by Rui Goncalves gave a unique solution and good coverage for this one, see
http://www.asu.cas.cz/~asteroid/1494.png
The only significant change there was in the deep minimum, apparently related to the decreasing solar phase. No indication of binarity. It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Gianluca and Rui!

Cheers, Petr [2006-09-01 15:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· finished at 2:20 UT. Data looks quite good and tomorrow I will send them to Petr.

Cheers,
Gianluca [2006-09-01 03:01, BellatrixObservatory]

· Started at 20:56UT, under excellent conditions. Hope to cover more than a period.

Cheers,
Gianluca [2006-09-01 01:35, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· Started at 20:56UT, under excellent conditions. Hope to cover more than a period.

Cheers,
Gianluca [2006-09-01 00:46, BellatrixObservatory]

· I planned to observe this tonight, but weather is turning bad enough to say it will not be a good night. If someone can take care of it tonight, we can probably close it.

Cheers,
Gianluca [2006-08-30 18:34, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· session ended at 2:10 UT. Great skies conditions. Data are leaving for Petr.

A quick check, using all the available data, provides a period of P=5.3507h, with a total amplitude of 0.5 mag.

No attenuations.

Cheers,
Gian [2006-08-26 02:33, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· Started at 20:45UT. I plan to sit on this all night, weather assisting.

Gianluca [2006-08-25 21:08, BellatrixObservatory]

· Clouds finally arrived, observations finished. Tomorrow I will reduce both nights sendiong data to Petr.

Good night/day,
Gianluca [2006-08-24 01:19, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

· Observations started at 22.14UT. Don't know how long, as clouds are around.

Gianluca [2006-08-23 22:19, BellatrixObservatory]

· Done from Bellatrix Observatory on 22 Aug 2006. Started at 22:35, finished at 02:02 UT. Two maxima are visible. A period guess by eye would say something close to 5h. The amplitude is at least 0.4 mag.

I plan to start another run in few hours, if weather holds.

Gianluca/Bellatrix [2006-08-23 17:51, BellatrixObservatory] Message sent to BinAstPhotSurvey conference

13070 SeanConnery (Finished) [Add new note]
· Data by David Higgins from Hunters Hill and by Rui Goncalves from Linhaceira revealed a period of 7.085 h (or twice that, but it is considered less likely since the data repeat pretty well with the shorter period), see
http://www.asu.cas.cz/~asteroid/13070.png
A few points there show deviations, but they appear correlated with higher reported errors, so presumably they were related to small observational problems. Only one group of a few points on Aug21 is somewhat suspicious, but the possible attenuation has a depth just at the limit of the Survey of 0.04 mag. David is not likely to get more data of good quality in the remaining of this lunation, and it will be fainter in the next lunation. So, considering the marginality of the apparent deviation, we close the target for the Survey now. A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-08-31 12:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 9:08UT to 13:45UT. Period refined to 7.086 +/- 0.003 hrs. The deviations of the 21st appear again at the start of tonight session!

Data sent to Petr and Peter. [2006-08-30 14:10, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 9:06UT to 15:23UT. Canopus prefers 7.09hr or double (though the double period just doesn't look right) over the 10.6hr solution.

What I find 'disturbing' is that a second target 45263 in the same images has the exact same period but a very different shaped plot! For this target I ruled out the 10.6hr solution as I could not achieve a suitable monomodal plot. [2006-08-30 04:30, HuntersHill] Message sent to BinAstPhotSurvey conference

· Six nights were joined in -- three of them were taken by David Higgins and three by Rui Goncalves (Tomar, Portugal) and data fit with three possible periods: 7.085 h (or double) and 10.627 h. Without more data we are not able to resolve the true one. No apparent deviations seen, except few points (probably outliers or affected by stars).

Peter K. [2006-08-29 16:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 9:27UT to 17:16UT in good conditions. Period refined to 7.087 +/- 0.004hrs with an amplitude of 0.16 +/- 0.02mag.

There appear to be some deviations from the base curve so this may well be a target of interest. Data sent to Petr and Peter. [2006-08-29 03:08, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:04UT to 18:06UT in average conditions. Period fits at 7 and 9.5 hours though one part of the curve does not match - possible attenuation? More data needed. [2006-08-22 00:13, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 09:55UT to 16:56UT in windy conditions. Possible period around 7 hrs or integer thereoff but too early to tell. [2006-08-21 00:22, HuntersHill]

(22321) 1991 RP (Finished) [Add new note]
· David Higgins is investigating this one more. It shows features that seem to be repeating with a period commensurate with 1 day. If someone can help out to cover it from a different longitude on a couple or a few nights, it could break the commensurability.

Petr [2006-08-25 09:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· This one looks to have a very low amplitude of 0.05 mag or so, but it may be also a longer period object with a higher amplitude. If someone could take a couple or a few linked nights, it might resolve this one.

Petr [2006-08-23 11:21, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 10:25UT to 18:54UT in average conditions. The data looks OK but now the period/solution is a complete mystery to me.

Data sent to Petr and Peter for analysis. [2006-08-22 02:39, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:36UT to 17:07UT in windy conditions. Still nothing definitive but last nights data seems to fit the previous nights very well indicating a period close to 12 hours or an integer thereof. Very low amplitude target approx 0.09 +/- 0.01 mag.

Data sent to Petr and Peter for analysis. [2006-08-21 00:50, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:38UT to 19:00UT (last hour affected by light fog/cloud). Still a very low amplitude target that shows possible solutions from 2 to 26 hours.

Given that this last session showed a straight line decrease in magnitude with a possible maxima at the start, this target could also have a long period. [2006-08-20 01:14, HuntersHill] Message sent to BinAstPhotSurvey conference

· Only 6 data points. Inidcation is still for a period in the order of 5-6 hours, 5.8 now favoured but more data required. Amplitude is very low, probably under 0.1 mag [2006-08-16 23:06, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 11:17UT to 17:30UT (Cut a couple of hours short due to dense fog). Low amplitude (~ 0.1mag) starting to show some promise with a possible period of around 5.3 hours. [2006-08-15 22:52, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 12:00UT to 19:27UT. Low amplitude somewhat noisy data with 0.02 error indicates a possible period around 5 hours. [2006-08-08 05:30, HuntersHill]

7169 Linda (Finished) [Add new note]
· Yes, this one appears to be a long period object (on an order of several tens of hours), though an exact period estimate is not possible from the available data. Its period longer than 10 h has been demonstrated sufficiently for the Survey, we close it here. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-08-22 08:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 9:34UT to 17:56UT in average conditions but what appears to be suprisingly good data. Apart from an apparent minima at the start the rest was a straight line increase over the duration of the session.

Data sent to Petr and Peter to see if they can make anything of it but it appears to be a long period. [2006-08-20 00:07, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:07UT to 13:09UT. Session cut short due to approach front and increased wind. Last 2 nights alone show a flat line with 0.05mag amplitude but there may be some shape there so I will continue to monitor this target. [2006-08-16 22:56, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 10:29UT to 17:18UT (cut short a couple of hours due to dense fog). This third night is almost a flat line with slight increase of 0.02mag and some noise.

Still cannot resolve a period. [2006-08-15 22:50, HuntersHill] Message sent to BinAstPhotSurvey conference

· Second night no better than the first. Observed from 11:50UT to 19:03UT. Both nights show a general increase in magnitude by about 0.07mag each night. Best guess - somewhere around 48-50hrs but the noise in the data may be a direct result of interferance from the moon. [2006-08-08 05:09, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full session observed 10:56UT to 19:11UT showing a low amplitude and noisy plot. Possible fit at 2.46hrs but more likely a long period low amplitude target. [2006-08-06 01:57, HuntersHill]

6009 (Finished) [Add new note]
· This one has been well done by Stefan, Jozef and Leos from Modra and by Don from Carbuncle Hill (2 nights from both stations). A unique period of 3.030 h, multiple coverage, no significant deviation seen:
http://www.asu.cas.cz/~asteroid/6009.png
Finished for the Survey. I've put a note on it to the Survey's webpage,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys.

Cheers, Petr [2006-08-21 11:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· we obtained another 6h of data, unfortunately much more star contaminated. leos, jozef [2006-08-17 02:40, Modra]

· Doing a run on this tonight. This will extend Modra's run.
Don [2006-08-16 00:10, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· looks like tonight the sky will be clear, planning to cover an interval of cca 6.5h. jozef [2006-08-15 20:11, Modra]

· Doing a run on this tonight.
Don [2006-08-13 02:14, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Clouds ended the run after 2,5 hours. Quick look gives P ~ 3h and A ~ 0.15 mag.

Stefan [2006-08-03 13:19, Modra]

· Started with the object at 20:40UT on Aug02. I don't know for how long run, clouds are crossing through mid Europe...

Stefan [2006-08-02 20:55, Modra] Message sent to BinAstPhotSurvey conference

(5247) Krylov (Finished) [Add new note]
· The extensive observations by Adrian et al. from Modra and by Don from Carbuncle Hill have shown that this one is a NPA rotator, PAR= -2 tending to -3, with the main period of about 81.5 h. A linkage of a part of the Modra data needs to be completed, a preliminary analysis suggests a second period about 68.5 h, see
http://www.asu.cas.cz/~asteroid/krylov.png
Three unlinked sessions from Skalnate Pleso and one session from Elginfield are consistent with the solution as well. We close it for the BinAstPhotSurvey, a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Adrian et al. and Don!

Cheers, Petr [2006-08-10 12:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· I got a short run in on this on starting at 3:40 on July 12. [2006-07-12 14:13, Shed of Science]

· The sky cleared, so I started this at about 03:20, June 21 UT.

Don [2006-06-21 03:50, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started at 01:30 , June 19 UT.

Don [2006-06-19 01:48, CarbuncleHill]

· Started at 02:45 , June 18 UT.

Don [2006-06-18 02:50, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Observed through clouds, but uncertainty in my linkages increase. There is probably a bonus for variable star hunters - 15 mag object "close to" this asteroid with amplitude of about 0.7 mag. But as in my previous similar cases with variable check stars in the past I do not know who cares. I didn't (if it is known, what is its type, to whom I could send data,...).
Adrian [2006-06-17 02:11, Modra] Message sent to BinAstPhotSurvey conference

· My third night - and probably linked data - are at disposal. But how to fit all data available?
Adrian [2006-06-16 02:10, Modra]

· Another successful night with linked data. Its size and rotational period place it close to a tumbler border line.
Adrian [2006-06-15 02:09, Modra] Message sent to BinAstPhotSurvey conference

· I hope I could add some part of the lightcurve. But some faint stars are projected nearby. And who knows what the weather will be like tomorrow to link short runs.
Adrian [2006-06-13 23:11, Modra] Message sent to BinAstPhotSurvey conference

· Observing from 21:40 UT. Michal [2006-06-07 21:58, Skalnate Pleso]

· Started this around 03:00, June 6 UT.

Don [2006-06-06 03:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Plan to start this at 2:45, May 29 UT.

Don [2006-05-29 02:05, CarbuncleHill]

· Plan to start this at 2:45, May 28 UT.

Don [2006-05-27 23:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Will start this slow rotator around 3:00, May 25 UT.

Don [2006-05-25 01:32, CarbuncleHill]

· Will start around 3:00, May 24 UT.

Don [2006-05-24 01:29, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this around 03:30, May 23 UT.

Don [2006-05-23 03:23, CarbuncleHill]

· Starting this one if the weather holds.

Don [2006-05-22 02:35, CarbuncleHill] Message sent to BinAstPhotSurvey conference

3665 Fitzgerald (Finished) [Add new note]
· The extensive work on this one by Julian from Leura, by David from Hunters Hill, and supported with one night by Peter K. from here has provided a good estimate of its period of 2.4142 h, see
http://www.asu.cas.cz/~asteroid/3665.png
One attenuation of 2006 June 18.4
http://www.asu.cas.cz/~asteroid/3665_060618_leura.png
has not been confirmed. It has been done sufficiently for the Survey, I'm closing it here now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, Julian, David and Peter.

Cheers, Petr [2006-08-09 15:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· After a week of bad weather and instruments faults, I did a 7.5 hours session lastnight started at 08:08 UT and finished at 15:36 UT 2006-07-08. With the moon just less than 20 deg away, the result is rather poor with error between 0.03-0.05. For what its worth, data is sent to Petr and Peter for analysis [2006-07-09 05:26, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I started last night 07:53UT 2006-06-28 and only have 2.5 hours before everything dews up. And that is the end of a good dry run. Rain has returned. [2006-06-30 06:18, Blue Mountains Obs]

· An 8.5 hours session done last night. Started at 08:20UT 2006-06-28. [2006-06-28 23:52, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Data for 7.5 hours were obtained . Started at 08:20 UT 2006-06-27. Very low amplitude of 0.15mag and error at <0.02 mag.

Julian [2006-06-28 00:37, Blue Mountains Obs]

· Weather prediction looks excellent for the rest of night. started today at 08:51UT 2006-06-26. Will go for 8 hours.
Last night 4 hours reaffirm the 2.414h period. No deviation detected.

Julian [2006-06-26 10:44, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Started tonight at 13:36 2006-06-24 UT. Started quite late due to equipment trouble. aiming for 4 hours.

Julian [2006-06-24 16:10, Blue Mountains Obs]

· Five nights taken by Julian from Leura suggest a period of 2.412 h (U=2+), but there is an apparent attenuation on his last night, see
http://www.asu.cas.cz/~asteroid/3665_060618_leura.png
The night has been cut short due to clouds, but the attenuation shouldn't be affected. We need to confirm it on another night. Data with errors not greater than 0.03 mag are needed for this one.

Clear Skies, Petr [2006-06-22 13:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· I started tonight at 08:55UT but cut short at 12:08 UT , by incoming clouds.
Excellent seeing for 3 hours [2006-06-18 21:05, Blue Mountains Obs]

· did an 8 hour session last night at 8:11 UT. lost 1 hour and abit to clouds but rest is ok.

Julian [2006-06-18 09:51, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· did an 8 hour session last night at 8:11 UT. lost 1 hour and abit to clouds but rest is ok.

Julian [2006-06-18 00:04, Blue Mountains Obs]

· Data obtained by David Higgins and Julian Oey between May 29 and Jun 16 shows that (3665) could be a binary. There are two additive components present in the data with P1 = 2.41 h and P2 = 18.33 h without any occultations/eclipses seen. See:

http://www.asu.cas.cz/~asteroid/3665_all.png
http://www.asu.cas.cz/~asteroid/3665_longpc.png
http://www.asu.cas.cz/~asteroid/3665_shortpc.png

More accurate data (with errors <0.02 mag) will be needed to finish its discovery phase. It is a low amplitude target (0.06 and 0.09 mag respectively) at -5. Nice work, David & Julian.

Peter K. [2006-06-17 06:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started tonight at 09:27 UT. It looks like a real good night and hope it remains. Planning for 7 hours

Julian [2006-06-16 10:31, Blue Mountains Obs]

· I did 6 hours of this asteroid with error between 0.01-0.02 mag. I have a solution at 2.41h period. Definitely need more data. Started at 10:07h UT 2006-06-15. [2006-06-16 01:44, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· I started this object at 09:32 UT. Although the moon is still bright, at least it is 60 deg. away. Seeing is excellent. Hope I will get good result tonight. [2006-06-14 11:58, Blue Mountains Obs] Message sent to BinAstPhotSurvey conference

· Not sure I am going to get anywhere with this target. Moon effected data is now > +/- 0.05 mag errrors. I will have to drop this one. [2006-06-12 22:42, HuntersHill]

· There are a few solutions in the range 9 to 20 hours,
http://www.asu.cas.cz/~asteroid/3665.png
The David's data with errors around or slightly above the Survey's requirement of 0.03 mag don't allow to resolve it, but a few long sessions with errors <0.03 mag might be able to resolve it. Julian, do you think that you might do it with your system able to take integrations of several minutes?

Cheers, Petr [2006-06-08 08:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Short session has revealed nothing new - still noisey data and difficult to nail a period. Data sent to Petr/Peter for analysis.

Though highly unlikely I get a quasi fit at 3.5 hrs and another at 19 hrs - could it be like sized objects orbiting each other every 19 hrs - wishful thinking :-) [2006-06-08 03:01, HuntersHill] Message sent to BinAstPhotSurvey conference

· Another 1/2 session with noisey data. No real change in the period but there are others around the 18/19 hour mark that fit. Low amplitudes are killing me lately! [2006-06-05 22:36, HuntersHill] Message sent to BinAstPhotSurvey conference

· A half session completed with 0.03-0.05 errors. The period seesm to now indicate something in the order of 18.6 hrs with an amplitude of 0.1mag. [2006-06-05 00:13, HuntersHill]

· Another full night and data just as noisy but no general decline with a rough period match at 9.9 or 10.65 hrs (given the end of one session dips below the curve). Amplitude is low (0.1 mag at best) and my data precision is still only 0.03 to 0.05mag)

Needs lots more data :-) [2006-05-31 02:29, HuntersHill] Message sent to BinAstPhotSurvey conference

· A little faint for me at the moment but observed for 8.5hrs. Data (+/- 0.03 to 0.05mag) shows a bumpy 0.18mag decline over the entire period. However, if the decline wasn't there one might guess a period of around 5.5 hours! [2006-05-29 22:21, HuntersHill] Message sent to BinAstPhotSurvey conference

(4082) Swann (Finished) [Add new note]
· Six nights by Marek et al. from Skalnate Pleso and two nights by Peter K. from here: unique solution, multiple coverage, no significant deviation seen,
http://www.asu.cas.cz/~asteroid/4082.png
It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys.

Cheers, Petr [2006-08-07 09:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Peter's data of the last night have resolved the ambiguity: the unique period is 4.0364 h,
http://www.asu.cas.cz/~asteroid/4082.png
No significant deviation seen in the data so far. There are two more nights from Skalnate Pleso that Marek will reduce by Monday, so we will wait for them before marking it as finished. But no more data are needed at this moment and we may turn to other targets.

Nice work, Peter and Marek et al.

Cheers, Petr [2006-08-03 11:31, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just started but don't know what the weather will allow.

Peter K. [2006-08-02 21:36, Ondrejov]

· Four nights by Marek et al. from Skalnate Pleso and two nights by Peter K. from here revealed a period nearly commenurable with 1 day. There are two possible periods: 4.04 h and 4.84 h, see
http://www.asu.cas.cz/~asteroid/4082.png
(A few more longer periods there are apparently aliases.)
Since the runs were only about 3 hours long and they were taken from nearby longitudes, they have not been able to resolve the ambiguity 4.04 vs 4.84 h so far. A single long session from another continent should resolve the ambiguity right away. I encourage someone to help out to nail down this one.

Cheers, Petr [2006-08-01 14:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· This object observed from 21:43 UT to 01:32 UT, July 31/August 01. Gabo [2006-08-01 01:44, Skalnate Pleso]

· This object observed from 21:15UT to 01:45UT, July 28/29. Gabo [2006-07-29 01:54, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Observing from 22:30 UT and expecting 3 hours long run. Peter K. [2006-07-24 23:23, Ondrejov]

· This one observed from 22:30 UT (July 22) to 01:15 UT.
Marek, Zuzana [2006-07-24 10:25, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Clouds disallow us to get next data to this one. We acquired 1 hour run only.
Marek [2006-07-21 23:55, Skalnate Pleso]

· The first period estimate says 4.2 hours. Amplitude 0.6 mag. [2006-07-21 03:39, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Next run on this one started from ~22:00 UT to ~02:00 UT
Marek [2006-07-19 22:09, Skalnate Pleso]

· Note on July 17 night:
One maximum catched. Due to not very good weather conditions and Moon there are mag errors > 0.03. Amplitude seems to be more than 0.6!

In these nights we have the telescope unhealthy. So next data are not guaranteed.

Marek [2006-07-19 14:26, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· Starting this one from 23:00 UT (July 17) to ~02:00 UT
Marek [2006-07-17 23:12, Skalnate Pleso]

1273 Helma (Finished) [Add new note]
· Yes, nice work, David. Your three nights give a unique solution, satisfactory coverage, no significant deviation seen. It is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-08-05 10:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 11:04UT to 19:26UT. Good data refined the period to 6.0851 +/- 0.0006hrs with an amplitude of 0.3 +/- 0.01 mag. No deviations noted.

Data sent to Petr and Peter to perhaps close this one off. [2006-08-05 05:17, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed from 15:30OU to 19:59UT. Good data refined period to 6.085 +/- 0.002 hrs with an amplitude of 0.32 +/- 0.01 mag. Limited data but no deviations evident.

Data sent to Peter and Petr. [2006-07-28 21:51, HuntersHill] Message sent to BinAstPhotSurvey conference

· Finally got a clear night and took on this new target. Observed from 11:44UT to 19:25UT and found a period of 6.10 +/- 0.05 hrs with an amplitude of 0.3 +/- 0.01 mag [2006-07-26 23:39, HuntersHill] Message sent to BinAstPhotSurvey conference

11574 d'Alviella (Finished) [Add new note]
· Six nights by David from Hunters Hill and two nights by Nelya from Simeiz revealed that the period is 12.55 h or 25.10 h, see
http://www.asu.cas.cz/~asteroid/11574.png
The U=2 result for the slowish rotator is sufficient for the Survey, we are closing it here now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-08-02 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data obtained by Ninel Gaftonyuk (Simeiz) on Jul 05 and Jul 06 and sent to me by Yurij Krugly ruled out 8- and 16-hour periods definitely. Current best fit is for 12.550 h but a double period is still possible. Well, we need even more data (David?).

Peter K. [2006-07-28 21:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data taken by David Higgins joined in. They fit with period of 12.546 h (or double) and they ruled out periods of 8 and 16 hours, as it seems now. But it could be only an effect of changed geometry and we need more new data to confirm it. Best if supported from another continent as all possible periods are in commensurability with 24 hours. What we need are sessions as long as possible with errors ~0.01 mag. This target is bright enough (14.8 mag) but at -13 decl. Who is able to observe it?

Three images linked in Petr's last message were updated with David's new data.

Peter K. [2006-07-28 12:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Full session from 10:50UT to 19:12UT with soem fog at the end. Data appears good but not fit to bimodal curves at 8, 12 or 16 hrs.

Data sent to Petr and Peter [2006-07-27 00:26, HuntersHill] Message sent to BinAstPhotSurvey conference

· The two new long sessions with good quality by David joined in. Per his note "the previous 2 sessions last 1/2 of each session was greatly affected by wind so the data can be considered suspect. (ie stars were not round and 2-3 times their normal size", I have eliminated the affected points of the two previous nights of July 5.7 and 6.7 from the solution. (Yes, stars 2-3 times their normal size are VERY poor conditions, such data may contain high errors and they are not reliable at all, so it is best simply to eliminate such highly affected points from the solution.)
The current dataset shows three possible periods, which David has already mentioned. The best estimates are:
16.72 h, 12.53 h, and 8.36 h. See following pictures
http://www.asu.cas.cz/~asteroid/11574_16h.png
http://www.asu.cas.cz/~asteroid/11574_12h.png
http://www.asu.cas.cz/~asteroid/11574_8h.png
More long sessions with errors of 0.01 mag are needed to eliminated the ambiguity. (At least one session should be taken from another continent, to break the commenasurability of the period with 1 day.) In any case, there is no significant deviation in the current dataset.

Cheers, Petr [2006-07-09 14:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Full session observed from 12:09UT to 20:03UT in relatively good conditions. Good data with 0.01mag precision. Plot reveals many possible solutions at 8.2, 12.6, 16.5 and beyond. I find 16.48 +/- 0.02hrs the most likey given that a reasonable single modal curve fits at 8.2 hrs.
Data sent to Petr and Peter. This is the last session this lunation. [2006-07-09 01:55, HuntersHill] Message sent to BinAstPhotSurvey conference

· A full session in good conditions observed from 11:59UT to 20:02UT. Note that in the previous 2 sessions last 1/2 of each session was greatly affected by wind so the data can be considered suspect. (ie stars were not round and 2-3 times their normal size - same applies to 3868)

Data sent to Petr and Peter. [2006-07-08 00:55, HuntersHill] Message sent to BinAstPhotSurvey conference

· David, your data are indeed unusual. No period shorter than 24 hours fits them well, and longer periods would require many extrema per cycle. More long sessions are needed to resolve this one. So far there are effectively only two and half nights; your first two relative sessions are <2 h long with low enough errors and they provide only little constraints.

Clear Skies, Petr [2006-07-07 08:17, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed full session but there is a gap in the middle due to grossly wind affected images. Periods are hard to resolve for this one but I think something around 12 hours may be the most likely.
Data sent to Petr and Peter [2006-07-07 02:23, HuntersHill] Message sent to BinAstPhotSurvey conference

· I observed it Jul 04 from 21:50 to 0:30 UT and started at 22 UT.
Nelya. [2006-07-05 23:00, Simeiz]

· Observed from 12:11UT to 19:44UT but severely affected by wind so even though the SNR of data points looks OK I think the measuring is suspect. However, it appears that a period of 10.01 hrs may be valid.

Data sent to Petr and Peter.

Observed from 12:17UT to 16:22UT and have reasonable data though session cut short due to cloud and extreme fog.
This one has a very odd lightcurve with a period of 5.217 +/0 0.003 hrs with an amplitude of 0.25 +/- 0.02. There is one peak with the rest of the curve basically flat. The data in the peak (on both nights) has errors of 0.06mag and occurs toward the end of the session. Maybe it's just coincidence! More data needed. [2006-07-04 23:08, HuntersHill]

Started new target and observed from 12:39UT to 17:29UT when cloud/dew ended the session. SNR was affected by Cloud/Dew. A possible period of around 10 hours was extracted by Canopus.
The forcast at Hunters Hill is for rain over the next few days so assistance with this taregt is welcome. [2006-06-29 22:35, HuntersHill] [2006-07-05 22:51, HuntersHill] Message sent to BinAstPhotSurvey conference

· Note wierd things are happening to this BINASTPHOT WEBtool record for this target. I think the entries that now have "\" in them should be deteted. [2006-07-05 22:48, HuntersHill]

(2557) Putnam (Finished) [Add new note]
· Ten linked nights by Leos and Stefan from Modra plus one night by Don from Carbuncle Hill indicate a period longer than 10 hours. The data fit reasonably with a period of 14.23 h, but other periods are not ruled out, so it is an U=2 solution, see
http://www.asu.cas.cz/~asteroid/2557.png
Nonetheless, the slowish rotator has been done sufficiently for the Survey and we may close it. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, folks, on the tough slowish rotator!

Cheers, Petr [2006-08-01 14:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· As feared, the humid air fogged the sky. The run never got started.
Don [2006-07-31 03:02, CarbuncleHill]

· This is again my main target - during the last night before my August holidays. Its period must be revealed after so many nights. Am I right?
Adrian [2006-07-31 01:28, Modra] Message sent to BinAstPhotSurvey conference

· I'll be doing this one tonight assumming no fog.
Don [2006-07-31 00:28, CarbuncleHill]

· Started run at 03:40, July 29 UT.
Don [2006-07-29 03:56, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Interrupting my holidays during hot days I try to help with this - at least tonight as clouds are expected tomorrow.
Adrian [2006-07-28 23:01, Modra]

· This target is worked at Modra observatory (don't know why they didn't put any note here). My analysis of their 9 night reveals a period of 14.25 h as a best fit but it is not a unique solution and two "near" periods are still possible, 8.9 and 17.8 h:

http://www.asu.cas.cz/~asteroid/2557.png
http://www.asu.cas.cz/~asteroid/2557_ff.png

As all three periods are in commensurability with one day it is impossible to resolve true one. We need another observer(s) at different longitude who is able to get a series of linked nights (Don?). This target is an easy one: 14.9 mag at -2 dec, no dense field.

Peter K. [2006-07-26 20:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be doing this one later tonight.

Don [2006-07-17 00:36, CarbuncleHill]

· Moon too close. Got nothing useful. I'll try again tonight.

Don [2006-07-14 13:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing a run on this tonight, July 14 UT.

Don [2006-07-14 02:06, CarbuncleHill]

· Starting this one tonight, June 22 UT.

Don [2006-06-22 01:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(19204) 1992 ME (Finished) [Add new note]
· Two linked Ondrejov nights and one Modra night taken in the May-June lunation have shown that this one actually has a period longer than 10 hours (amplitude of 0.1 mag or greater). It is not likely that more data will be taken in the rest of this apparition, so I'm closing it here now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-07-11 12:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 2:40 UT and hoping to observe until 8:00 UT. [2006-06-25 02:45, Elginfield]

· Observing from 21:50 UT. Peter K. [2006-06-05 22:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed June 3 & 4 from GMARS. This low amplitude asteroid is now getting into crowded fields. [2006-06-05 00:29, Santana]

· Observing from 20:45 UT. Peter K. [2006-05-24 21:48, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yes, a weak solution of 5.5 hours
http://www.asu.cas.cz/~asteroid/19204.png
Most useful now would be two full linked consecutive nights. I think that Peter K. at Ondrejov or folks from Modra might be best suited to take them.

Petr [2006-05-22 09:20, Ondrejov] Message sent to BinAstPhotSurvey conference

· On May 20 & 21 I got 6 and 5 hours of data from GMARS. The target is very low in amplitude, around 0.05 magnitudes. In addition, there does not appear to be any distinct features in the lightcurve. A very preliminary guess for the period is around 5.5 hours. However, this is very suspect. I will not be able to get back to this target for a couple of weeks because I will be traveling. The data has been sent to Peter and Petr. [2006-05-21 20:13, Santana] Message sent to BinAstPhotSurvey conference

(20452) 1999 KG4 (Finished) [Add new note]
· The three nights by David have done this one well for the BinAstPhotSurvey, as David has already marked here a couple days ago. Now a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work again, David.

Cheers, Petr [2006-07-01 15:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· A full session observed from 08:16UT to 16:27UT with double coverage and good data reveals a binmodal solution of 3.849 +/- 0.002 hrs with an amplitude of 0.34 +/- 0.01mag.
As no deviations are seen, Petr has suggested I call this target finished. [2006-06-28 22:58, HuntersHill] Message sent to BinAstPhotSurvey conference

· A near full session from 09:18UT to 16:32UT (some wind issues) with double coverage on each nigh refines the period to 3.857 +/- 0.002hrs with an amplitude of 0.34 +/- 0.01mag. No deviations have been detected. [2006-06-27 22:30, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full session observed from 09:11UT to 16:38UT reveals a period of 3.85 +/- 0.02hrs with an amplitude of 0.35 +/- 0.02mag. [2006-06-26 23:10, HuntersHill]

(6406) 1992 MJ (Finished) [Add new note]
· The two full and one partial night by David have done the target well for the BinAstPhotSurvey, as David has already marked here a couple days ago. Now a note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, David.

Cheers, Petr [2006-07-01 13:18, Ondrejov] Message sent to BinAstPhotSurvey conference

· Small amount of extar data obtained before heavy fog. Refines the solution to 6.819 +/- 0.002hrs with an amplitude of 1.1 +/- 0.02mag.
No deviations seen and as suggested by Petr this target is finished. [2006-06-28 23:00, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full nights run from 12:25UT to 20:00UT and a little more than 1 period coverage per night refines the period to 6.818 +/- 0.003hrs with an aplitude of 1.1 +/- 0.02mag. No deviatiosn in the curve have been detected. [2006-06-27 22:09, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full nights run from 12:46UT to 19:59UT reveals a period of 6.74 +/- 0.04hrs with an amplitude of 1.1 +/- 0.01mag. [2006-06-26 22:19, HuntersHill]

1293 Sonja (Finished) [Add new note]
· David has done this one well with his two long sessions: unique solution, multiple coverage, no deviation seen. Well done for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Yura Krugly has informed me that they have unpublished absolutely calibrated data for the asteroid obtained within their Kharkiv-Simeiz phase curves project in Fall 2003. Their current observing effort from the Simeiz Observatory is basically a continuation of their phase curve project. Nelya, if you liked to provide this apparition's data taken from your station (even before their absolute calibrations are completed) also for the BinAstPhotSurvey, you will be welcome, just send me them as you reduce them and I can join them here with the David's ones.

Btw, Yura has mentioned that their 2003 calibrated data gave a rather fainter H value of 13.8 than the rough MPC's values of 12.0. It is a big difference, so I encourage you to at least prepublish your H estimate on a website. It will be interesting to see if the current apparition's H value is similarly faint.

Cheers, Petr [2006-06-26 10:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Session started very late due to cloud. Observed target from 13:31UT to 19:22UT refines the period to 2.879 +/- 0.002hrs with an amplitude of 0.2 +/- 0.01mag. No deviations have been detected as yet. [2006-06-25 22:33, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full session on 1293 12:20UT to 19:19UT 24 Jun 2006 reveals a period of 2.89 +/- 0.02hrs with an amplitude of 0.2 +/- 0.01 mag. A quick measure in Canopus shows it at Mag 14.9 [2006-06-24 22:59, HuntersHill] Message sent to BinAstPhotSurvey conference

· I observed 1293 June 17, 21:40-0 UT. It is fainter than the MPC's H value.
Nelya. [2006-06-18 10:05, Simeiz]

7262 Sofue (Finished) [Add new note]
· This one has been well done with five nights by Russ from Shed of Science Observatory supported with one night by Don from Carbuncle Hill. Unique solution, double coverage, no significant deviation. It is finished for the Survey.
http://www.asu.cas.cz/~asteroid/7262.png
A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, Russ and Don.

Cheers, Petr [2006-06-24 11:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Thanks Don!,
I started a run at about 3:00 UTC June 22 and should be able to run until about 8:30.

Russ [2006-06-22 04:18, Shed of Science]

· I can provide some help with this, hopefully. I'm starting what will be a fairly short run at about 01:30, June 22 UT.

Don [2006-06-22 01:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Hi All,
I am looking for some help finishing up 7262 Sofue. Looks like two consecutive nights will do it. Somehow though, I have only gotten a few scattered clear nights lately and things dont look super promising for the next few nights.

This is a pretty bright object, around 14th mag and looks like a 8-9 hour period with a ~.1m amplitude. Good for smaller scopes. It would be especially useful to coordinate a long run on a single night.

Regards,

Russ [2006-06-21 19:46, Shed of Science] Message sent to BinAstPhotSurvey conference

· Starting a run on 6/19 at 3:00. Clouds here and there...so this might be a short run. Best I can expect is a 5 hr run tonight. Russ [2006-06-19 03:37, Shed of Science]

· Got in another run in on 6/15 despite a bright moon. Russ [2006-06-16 05:13, Shed of Science] Message sent to BinAstPhotSurvey conference

· One ~5 hr run on this object suggests a ~9hr period. Assistance appreciated after the full moon. Russ [2006-06-09 13:40, Shed of Science]

(20031) 1992 OO (Finished) [Add new note]
· This one has been done well by Don from Carbuncle Hill and by Peter K. from here. Unique solution of 10.838 h, sufficient coverage, no deviation seen. Well done for the Survey.
http://www.asu.cas.cz/~asteroid/20031.png
A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don and Peter.

Cheers, Petr [2006-06-22 11:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 3 hours last night but some high clouds and background stars affected my run.

Peter K. [2006-06-21 08:54, Ondrejov]

· My 4-hours long run from the last night confirms current solution and refines it to 10.831 h (ampl. >0.32 mag).

Peter K. [2006-06-19 15:06, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started at 02:45, June 18 UT.

Don [2006-06-18 02:50, CarbuncleHill]

· I observed it for 4 hours last night. Current best fit is ~10.8 h, ampl. >0.3 mag (data combined with Don's, assuming bimodal shape).

Short night should be a problem so some help from different longitudes is welcome.

Peter K. [2006-06-08 12:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· With unexpected clearing, I started this object. Fog is a possibility later.

Don [2006-06-06 03:24, CarbuncleHill]

3212 Agricola (Finished) [Add new note]
· We have not got enough data for this one, the two nights by Vishnu and Ron from Carbuncle Hill provide only a lower limit of P>6 h, U=1. It is not sufficient for our Survey, so this object doesn't enter into the BinAstPhotSurvey sample, but I have put the U=1 result at least to the summary page linked on
http://www.asu.cas.cz/~ppravec/newres.htm

Petr [2006-06-07 13:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· 2nd night on this object began ~ 3 UT...should get in 5+ hours again.

Vishnu & Ron [2006-05-07 04:42, Vishnu Reddy/Tucson]

· Finished this object after a run of ~5h.

Vishnu & Ron [2006-05-06 09:06, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Started run on this object. Should get at least 5 hours tonight if all goes well.
Vishnu & Ron [2006-05-06 04:16, Vishnu Reddy/Tucson]

(12290) 1991 LZ (Finished) [Add new note]
· Hi David,
Yes, I see how the (relatively) long period, low amplitude lightcurve intricated against. A probable (U=2) solution is 21.96 h, see
http://www.asu.cas.cz/~asteroid/12290.png
(A few points that are probably residual spikes of close encounters with background stars you mentioned have been excluded from the fit and they are marked with x's in the picture above.)
In any case, your data demonstrated it that it is a slow rotator with a period >10 hours, so it is sufficient for the BinAstPhotSurvey. We may close it here now. I've added a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-05-31 09:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another night for 12290 but this time I can't get a curve to fit. This one looks really noisey even though errors are under 0.03.
Data sent to Petr and Peter for analysis. [2006-05-31 03:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full sessions the last 2 nights. Possible single modal solution at 10.9 hrs and a bimodal at 21.7 hrs. Data is within required precision but it looks noisey. Total amplitude is still around 0.1 mag. [2006-05-29 22:59, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full session (crowded field) but using StarBGone the data appears reasonably good given it's low amplitude. A period in the mid to high teens seems likely with an amplituded of around 0.15 +/- 0.02mag. [2006-05-24 22:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Full session but in the same field as a mag 5 star so the data may be suspect. Period possibly around 14 hrs with an amplitude around 0.16. [2006-05-22 22:49, HuntersHill]

(33116) 1998 BO12 (Finished) [Add new note]
· Three and half nights by David from Hunters Hill for this one: unique period, good coverage, no significant deviation seen. It is finished for the Survey. Note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, David!

Cheers, Petr [2006-05-25 12:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another full night has refined the period somewhat to 6.345 +/- 0.002hrs. No deviations detected. Data has been sent off to Petr and Peter. [2006-05-24 22:33, HuntersHill]

· Another full night with good data refines the period to 6.341 +/- 0.003 hrs with an amplitude of 0.3 +/- 0.03 mag. No deviations noted though there is one small gap in the plot (missing images which I need to investigate)

Data sent to Petr and Peter [2006-05-22 22:31, HuntersHill] Message sent to BinAstPhotSurvey conference

· Good coverage and good data last night reveals a period of 6.34 +/- 0.01 hrs with an amplitude of 0.3 +/- 0.03 mag. Going for another session tonight. [2006-05-22 08:53, HuntersHill]

· Obtained coverage until cloud ended session. Just a little more than what looks like 1/2 period indicates perhaps a 5 hour duration. [2006-05-18 13:06, HuntersHill] Message sent to BinAstPhotSurvey conference

(2942) Cordie (Finished) [Add new note]
· The linked 14 nights data by Don Pray showed that this one is a slow rotator with a main period likely around 80 hours and deviations suggesting tumbling. It has been done sufficiently for the BinAstPhotSurvey, so we are closing it here now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work on this slow rotator, Don.

Cheers, Petr [2006-05-23 16:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· A surprise break in the continuous rain of the past week may allow a run on this. I'll give it a try.

Don [2006-05-16 23:06, CarbuncleHill]

· I spoke too soon. Moon is too close to do this one tonight.

Don [2006-05-07 01:15, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'm doing yet another run on what appears to be a very slow rotator, possibly a tumbler.

Don [2006-05-06 23:10, CarbuncleHill]

· I'll be doing this one tonight. I sound like a broken record...

Don [2006-04-30 00:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be doing this one tonight. [2006-04-28 22:42, CarbuncleHill]

· I'll be doing this one tonight.

Don [2006-04-28 00:10, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be doing this one tonight, but like last night will be sampling sparsely as it's a slow rotator.

Don [2006-04-26 23:54, CarbuncleHill]

· I'll be doing this one tonight, but like last night will be sampling sparsely as it's a slow rotator.

Don [2006-04-22 00:45, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be doing this one tonight, but like last night will be sampling sparsely as it's a slow rotator.

Don [2006-04-20 22:31, CarbuncleHill]

· I'll be doing this one tonight, but sampling sparsely as it's a slow rotator.

Don [2006-04-19 23:11, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing this one tonight under more favorable conditions than last night.

Don [2006-04-17 00:41, CarbuncleHill]

· Taking a first look at this tonight, Apr 16 UT.

Don [2006-04-16 02:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(10909) 1997 XB10 (Finished) [Add new note]
· This one has been done well by David from Hunters Hill: a unique period, good coverage, no significant deviation seen. Finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, David.

Cheers, Petr [2006-05-22 13:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· Reduced the data. Good data has revised the period to 3.2483 +/- 0.0002hrs. No significant deviation seen. Taking one more at least part night tonight. Data sent to Petr and Peter. [2006-05-22 08:34, HuntersHill] Message sent to BinAstPhotSurvey conference

· Got what looks like a full nights run ont he target but won't be able to reduce the data for a while (another 10 hours) - I'm on Jury Duty... [2006-05-21 22:04, HuntersHill]

· Average conditions and short session due to cloud. Data fits existing period of 3.2483 +/- 0.0005hrs. No significant deviations seen but too much of the data is lower than the required precision to rule it out. [2006-05-18 13:08, HuntersHill] Message sent to BinAstPhotSurvey conference

· Low precison data due to poor conditions. Canopus finds the best solution (by a long long way) at 6.5 hrs (4 peak) but a 2 peak solution fits well at 3.249hrs (and the1/2 period 1 peak is a nice domed plot).

Data sent to Petr and Peter. [2006-05-17 21:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· A second complete night (4th session) refines the solution to 3.248 +/- 0.001hrs with an amplitude of 0.4 +/- 0.02 mag. No deviations in the curve have been detected as yet. [2006-05-16 22:15, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced around 11:00 UT but session cut short by cloud. 1.5 periods covered revealing a period of 3.24 +/- 0.03 hrs with an amplitude of 0.4 +/- 0.02 mag

Moon will most likely obscure the taregt tonight. [2006-05-10 22:44, HuntersHill] Message sent to BinAstPhotSurvey conference

(31667) 1999 JL3 (Finished) [Add new note]
· Sorry - that should read 7.305 +/- 0.004hrs. [2006-05-17 03:37, HuntersHill] Message sent to BinAstPhotSurvey conference

· Second complete night for this target. Far too faint for me for this Surveys purposes. I derive a period of 7.499 +/- 0.006 hrs with an amplitude of 0.2 +/- 0.04 mag.

As the target is fading Petr suggested I call it finished when I am done with the target - I'm calling this one finished. [2006-05-16 22:34, HuntersHill] Message sent to BinAstPhotSurvey conference

· Target is fainter than expected at around mag 16.7. Session commenced at 11:00 and cut short by cloud. Data reveals a possible period of 7.6 hrs with an amplitude of 0.15 +/- 0.05mag. [2006-05-10 22:46, HuntersHill] Message sent to BinAstPhotSurvey conference

(24891) 1997 AT2 (Finished) [Add new note]
· This one has stayed here for a long time, as I waited for a check of a couple deviations in the night of 2005-10-29.2 from Elginfield. No definite word from Shannon yet, but my revisit of the data here suggests that the couple deviations are quite likely an interference with background stars. Otherwise, the result is usable: unique period, errors about 0.03 mag, multiple coverage, no deviation indicating a binarity. So, we may close it as finished; a note on it put
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
http://www.asu.cas.cz/~ppravec/24891.png

Cheers, Petr [2006-05-04 14:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· A joint analysis of the data taken by Don Pray from Carbuncle Hill on 2005-10-31.2 with those by Nelya Gaftonyuk from Simeiz during 10-04 to 10-10 show a unique solution with a period 6.171 h and error well below 0.001 h. It looks like Don may be able to complete the double coverage with usable errors well by himself, but he may surely ask for an assistance in the group if his conditions turned worse.

Cheers, Petr [2005-10-31 18:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Nelya Gaftonyuk has sent me their data. She has derived a unique period of 6.171 h, see her message enclosed below. The dataset is, however, insuficcient in coverage and errors of a part of the data for the BinAstPhotSurvey. So, if Don and/or someone can cover it well (double coverage, errors not greater than 0.03 mag) now, do it.

Cheers, Petr

Dear Petr ,
I observed 24891 1997 AT2 in during four nights. Period is P=6.171 h ± 0.004 and amplitude is about 1 mag ( A=0.96mag).

Best regards,
Nelya. [2005-10-31 15:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Fyi, this one has been done by Ninel Gaftonyuk from Simeiz in the past lunation:

24891 1997 AT2 (R)
05-10-3/4 00:40 - 02:40
05-10-4/5 23:20 - 02:40
05-10-5/6 23:20 - 01:50
05-10-10/11 18:00 - 23:30 cal.

but I haven't seen her results yet. Ninel, if you can reduce them fast, please do so, so that we can plan if and how much additional observations are needed for it. Thanks.

Cheers, Petr [2005-10-31 12:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Starting this at 00:20 10/31 ut under a very transparent sky. It's at the edge of my magnitude limit, so we'll see what happens.

Don [2005-10-31 00:30, CarbuncleHill]

(2862) Vavilov (Finished) [Add new note]
· Three calibrated nights for this one by Peter K. here have suggested a very slow rotation. Peter has taken three more nights, but the fields can be calibrated not sooner than in Autumn. I'm closing it here now, and put a note on the preliminary (U=2-) estimate of 200 h to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
for now.

Cheers, Petr [2006-05-04 13:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Three linked nights by Peter K. here suggest a very long period (several days). Peter will continue this one as a secondary target here (taking 2-3 short linked series per night), but if some other station able to link its data to (at least) its own instrumental system could collaborate on establishing it, it would be a tremendous help. Bob? Others? If you are interested to help out with this one, contact us.

Cheers, Petr [2006-01-30 13:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 7+ hours tonight. It seems to be long-period asteroid.

Peter K. [2006-01-28 04:26, Ondrejov]

· Looks like that two linked nights with errors of 0.01 mag will be needed to show what this one is like. Guys, who of us do take up the challange?

Clear Skies, Petr [2006-01-22 12:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2862 for about 5.5 hours before interfering stars cut off session.

Possible period in the range of 6-8 hours, but very low amplitude, 0.03 or so. Could also be a long period with some wiggles. Looks like this one is too dim for my system to get the necessary accuracy. I'll discontinue observations, and leave this for others.

Good luck.

Bob Koff [2006-01-21 15:21, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Starting observations on 2862 tonight at Antelope Hills.

Bob Koff [2006-01-21 04:20, AntelopeHills]

(2348) Michkovitch (Finished) [Add new note]
· This one has been shown to be a slow rotator by David from Hunters Hill; he estimated P>28 h:
http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm
The slow rotator's U=2 result is sufficient for the Survey, and since no more observations are likely to be taken for it in the rest of this apparition, I am closing it,
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-05-04 13:46, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2348 from 09:41UT to 16:12UT. Continually decending (at a much steeper rate that the first night. Possible period in the vicinity of 35 hours! [2006-03-09 21:26, HuntersHill]

· Great nights data with 0.005 precision but for the entire 6.5 hour run the targets magnitude continually declined with no hint of a peak or trough (total amplitude over the run was 0.12mag). Targets period is likely in excess of 26 hours. [2006-03-04 00:45, HuntersHill] Message sent to BinAstPhotSurvey conference

· Trying a new target since 17260 is obscured. Should get 6 hours if the weather holds. [2006-03-03 11:08, HuntersHill]

(1629) Pecker (Finished) [Add new note]
· Despite the extensive effort with high quality data by Bob from Antelope Hills and Don from Carbuncle Hill, supported by Adrian et al. from Modra and by Peter K. from here, the ambiguity in this one -8.217, 12.325, or 16.433 h- has not been resolved. It remains a U=2 result. Nevertheless, deviations apparent there are small (a couple 0.01 mag) and they don't indicate a binarity. So, this case may be considered as a safe non-detection, even if we cannot be sure in its period. It's closed for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
http://www.asu.cas.cz/~ppravec/1629.png

Petr [2006-05-04 09:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Unfortunately, it seems that my enthusiasm is over - suddenly clouds came here and I am not a meteorologist to know if the sky will be clear tonight again.
Adrian [2006-05-03 21:03, Modra]

· So it is up to me to finish it? With pleasure - providing that the weather, stars in the background, telescope guiding, and so on allow me. The third maximum out of four in the composite lightcurve is expected to be covered. It is the strangest one - with wavy structure. Let's go.
Adrian [2006-05-03 20:29, Modra] Message sent to BinAstPhotSurvey conference

· Started with it on May2, 21:54UT.

Stefan [2006-05-02 23:13, Modra]

· I plan to do this tonight IF other(s) are planning for it as well.

Don [2006-04-26 13:31, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll give (1629) a try tonight, starting at about 04:30.

Bob [2006-04-26 00:34, AntelopeHills]

· Like yesterday, I'm clouded out here tonight. Wednesday and Friday nights are forecast to be good.

Don [2006-04-25 22:18, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Yesterday we obtained only 2 hours of data because of clouds, chances are tonight we get more lucky, plan to finish at cca 2:00 UT with 5 hours of data. hopefully some of u can pick it up (Bob, Don?). Jozef [2006-04-25 21:47, Modra] Message sent to BinAstPhotSurvey conference

· Clouded out at Antelope Hills, and will not be able to add to Modra's observations.

Bob Koff [2006-04-24 22:49, AntelopeHills]

· We started this at 21:15 UT and plan to continue till dawn (~1:45 UT), if the cirrus allows. Leos, Jozef [2006-04-24 21:44, Modra] Message sent to BinAstPhotSurvey conference

· I will plan to start a run on (1629) about 05:00 UT April 21.

Bob [2006-04-20 22:36, AntelopeHills]

· I can do a couple hours on this one if Bob will pick it up at 5:00UT.

Don [2006-04-20 22:33, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· I'll be starting this at 03:40, Apr 20 UT and run about two hours to lengthen Bob's run.

Don [2006-04-19 23:08, CarbuncleHill]

· Planning to start a session on (1629) at about 0500 UT April 20.

Bob [2006-04-19 22:21, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Four night by Bob from Antelope Hills and two night by Don from Carbuncle Hill have revealed a period of 8.23 h that is unique assuming a bimodal lightcurve.
http://www.asu.cas.cz/~ppravec/1629.png
We will attempt to rule out a remaining ambiguity of possibly different number of extrema per period (half-integer multiple periods) with high quality data when the Moon doesn't disturb (i.e., well after the full moon; the asteroid will further brighten by then, so really high quality data should be possible). A couple nights by Bob, Don, and Peter or Adrian in the next week might suffice.

Wishes for Easter!

Petr [2006-04-14 09:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started a session at 05:15 UT April 13.

Bob [2006-04-13 05:37, AntelopeHills]

· Started a session on (1629) at 05:30 UT April 12.

Bob [2006-04-12 05:42, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Don's data of the past night joined in with the two Bob's linked nights. No shorter period than 15.0 h fits the available data:
http://www.asu.cas.cz/~ppravec/1629.png

We'll see if the quadrumodal lightcurve solution holds with more data.

Cheers, Petr [2006-04-11 16:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· I plan to start this about 03:35, Apr11 UT.

Don [2006-04-11 03:15, CarbuncleHill]

· This one may have a period around ~10 hours, see Bob's linked data on
http://www.asu.cas.cz/~ppravec/1629.png
But it is still rather uncertain solution. Bob will take more data, but since he may observe it for just ~6 hours in a night, he would appreciate a help by another station at a different longitude. Keeping errors of 0.01 mag that Bob has got so far should be good (so don't bother with it when the Moon is too close).

Cheers, Petr [2006-04-10 16:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Obtained a second night of observations on (1629) on a
April 10. Sending data to Petr.

Bob Koff [2006-04-10 14:01, AntelopeHills]

· Started observing (1629) Pecker at 05:30 UT April 9th.

Bob Koff [2006-04-09 05:55, AntelopeHills] Message sent to BinAstPhotSurvey conference

(11271) 1988 KB (Finished) [Add new note]
· This one has been well done by Don from Carbuncle Hill (05-01.2) and by Peter K. from here (05-03.0). Two more sessions by Zbig from Elginfield are mostly consistent, though there are a few small deviations (suspected to be due to faint background stars; Zbig, did you check for them well?), so those data are not used in the solution for now. Unique period, satisfactory coverage (a few gaps in the double coverage are of a tolerable length), no significant deviation seen. It is finished for the Survey.
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
http://www.asu.cas.cz/~asteroid/11271.png

Nice work, guys.

Cheers, Petr [2006-05-03 08:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 20 UT and expecting full-night run (6 hours). Peter K. [2006-05-02 20:36, Ondrejov]

· I'll be starting this one tonight, May 1, UT.

Don [2006-04-30 22:47, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(34442) 2000 SS64 (Finished) [Add new note]
· Two good long nights by both David from Hunters Hill and Peter K. from here (plus a few less ideal sessions) for this one: unique period, good coverage, no significant deviation. Done for the Survey. A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
http://www.asu.cas.cz/~asteroid/34442.png

Cheers, Petr [2006-04-26 08:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed for 5.5 hours tonight. Peter K. [2006-04-26 04:04, Ondrejov]

· Observed from 20 UT and just finishing full-night run (5.5 hours). The weather was less than perfect with quick changing clouds but data are of sufficient quality and target should be finished now.

Peter K. [2006-04-25 01:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another short session - this time cloud. Additional poitns were reasonable data no deviations noted. Period refined to 5.3318 +/- 0.0002 hrs, amp 0.85 +/- 0.03 [2006-04-23 22:46, HuntersHill]

· My automation software failed right after I went to bed so only managed 5 points covering the first part of the curve. Nothing special noted. [2006-04-23 04:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Got nearly full coverage after rain with very good data. No deviations noted in the plot and period refined to 5.3317 +/- 0.0003hrs with an aplitude of 0.85 +/- 0.03 mag

http://www.david-higgins.com/Astronomy/asteroid/images/34442.gif

I think this one is done. Data sent to Peter and Petr. [2006-04-22 01:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Got a partial wind affected session that tied in with the existing period refined to 5.3315 +/- 0.0005hrs, amplitude 0.85 +/- 0.03 mag [2006-04-20 22:25, HuntersHill]

· Session terminated due to cloud [2006-04-12 22:11, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started session 10:30UT [2006-04-12 11:52, HuntersHill]

· Mediocre data is very poor conditons reveals a period of 5.338 +/- 0.002hr ampl 0.8 +/- 0.05mag. [2006-04-11 22:02, HuntersHill] Message sent to BinAstPhotSurvey conference

· Good data in poor conditions on what looks like a simple target. Period 5.37 +/- 0.03hr, amp 0.8 +/- 0.03mag. One full period covered.

http://www.david-higgins.com/Astronomy/asteroid/images/34442.gif [2006-04-09 23:08, HuntersHill] Message sent to BinAstPhotSurvey conference

(9992) 1997 TG19 (Finished) [Add new note]
· This one has been finished well by collaborative observations from Hunters Hill, Ondrejov, Modra, and Carbuncle Hill. After a careful check of data, no significant deviation seen. Unique period, well covered, so it is finished for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
http://www.asu.cas.cz/~asteroid/9992.png

Btw, my counter here shows that we have covered (found binary, finished, or closed) 100 objects within the BinAstPhotSurvey now. So, we are a halfway in the basic plan of the Survey, which is to get a sample of 200 objects within the Survey, that should be sufficient for basic analyses.

Cheers, Petr [2006-04-24 12:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Well I took a look at my 09 Apr data again and remeasured them again and this time there is no deviation. Some factors:
1. Object came close to a bright galaxy,
2. Few comp stars.
For this variation I think I either chose ones that got too close to the edge of the image or at least 1 is slightly variable or having picked up on the variable one I selected the wrong comp star to ignore when re-measuring.

In any case the large deviation is no longer present. (Petr and Peter have my data)

http://www.david-higgins.com/Astronomy/asteroid/images/9992LC.gif

I think this one is done! Sorry for leading you all down the garden path. [2006-04-22 02:09, HuntersHill] Message sent to BinAstPhotSurvey conference

· Completed 1/2 session after the open observatory got rained on. Reasonably good data and no deviations from the primary curve noted.

http://www.david-higgins.com/Astronomy/asteroid/images/9992LC.gif [2006-04-22 01:41, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started at 00:30, Apr 22 UT.

Don [2006-04-22 00:44, CarbuncleHill]

· Planning this for tonight. Peter K. [2006-04-21 12:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a largish part of a session tonigt but the data was wind affected. Tied in with existing period plot and no deviations (other than caused by the wind) noted.

Period refined to 5.7415 +/- 0.0012 hr, amplitude 0.40 +/- 0.03 mag. [2006-04-20 22:30, HuntersHill] Message sent to BinAstPhotSurvey conference

· I'll be doing this one tonight.

Don [2006-04-20 22:29, CarbuncleHill]

· Target for tonight. I hope at least several images will be of good quality, but who knows while working with old telescope with worsening guiding.
Adrian [2006-04-20 21:36, Modra] Message sent to BinAstPhotSurvey conference

· Observing from 19:45 UT but my weather is getting worse (high cirrus). I don't know how long it will be usable.

Peter K. [2006-04-19 22:26, Ondrejov]

· Observed for 2.5 hour under conditions slightly degraded by clouds. My observation agrees with a period of 5.745 h, no deviating points seen.

Peter K. [2006-04-19 02:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· The period of 5.743 h seems to be well established, but the deviating points seen in the last third of the first night are suspicious indeed. It might be a binary, but more data are needed to confirm. The asteroid is well observable from both hemispheres, so I encourage others here to help out David with this one.

Cheers, Petr [2006-04-18 11:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another full night. Nights 2 and 3 match well but night 1 is only a partial match to a solution of 5.743 +/- 0.003hrs with an amplitude of 0.55 +/- 0.05mag.

http://www.david-higgins.com/Astronomy/asteroid/images/9992LC.gif [2006-04-17 01:40, HuntersHill] Message sent to BinAstPhotSurvey conference

· Another full night on 9992 but the moon was a factor. Best period I can come up with from relatively noisey data is 6.2 hrs but there are anomolies for Petr/Peter to look at. Maybe a target of interest.

http://www.david-higgins.com/Astronomy/asteroid/images/9992LC.gif [2006-04-16 01:45, HuntersHill] Message sent to BinAstPhotSurvey conference

· Possibly interesting target. Full session in not so good conditions reveals a period of around 5.2 +/- 1hr (assuming bimodal) with an amplitude of 0.6 +/- 0.05. Raw plot:

http://www.david-higgins.com/Astronomy/asteroid/images/9992LC.gif [2006-04-09 23:06, HuntersHill] Message sent to BinAstPhotSurvey conference

2195 Tengstrom (Finished) [Add new note]
· This one has been done well enough with two long (7-8 h) nights by David from Hunters Hill. The period is reasonably established (U=3-), no significant deviation from the main period seen. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Good work, David!

Cheers, Petr [2006-04-18 08:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another full session. Although noisy, the data agrees with the first night resolving a period of 2.816 +/- 0.003hrs with an amplitude of 0.2 +/- 0.03mag.

http://www.david-higgins.com/Astronomy/asteroid/images/2195LC.gif [2006-04-17 01:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· First night on this target competing with the moon. Relatively noisy data revealed a period of 2.82 +/- 0.03 hrs with an amplitude of 0.2 +/- 0.03mag. Period covered twice in this session.

http://www.david-higgins.com/Astronomy/asteroid/images/2195LC.gif [2006-04-16 01:48, HuntersHill] Message sent to BinAstPhotSurvey conference

(10772) 1990 YM (Finished) [Add new note]
· Data (partially linked) by Adrian et al. from Modra, by Bob from Antelope Hills, and by Brian from PDO have shown that this one is a slow rotator. Though Adrian will study it a bit more to see whether its possible NPA rotation can be constrained, it has been already worked well enough for the Survey, so we close it now. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-04-11 10:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· I would prefer 4786 to 10772, but not under current changing conditions. I'm back again on this and an attempt to link data 3 nights ago. Hoping this week is the last chance to finish this target whatever is the result.
Adrian [2006-04-04 22:19, Modra] Message sent to BinAstPhotSurvey conference

· Bob has sent his data of 2006-03-24.3 that begin just before Adrian left off on his night of 2006-03-24.0, so the two datasets together effectively make a single 16-h long run. A very useful strategy for slow rotators (and not only). In addition to making an effective single long run, it also ties the two different systems of the two stations together for this one.

The period solution of 68.5 ±0.5 h holds, see
http://www.asu.cas.cz/~ppravec/10772.png

Cheers, Petr [2006-03-26 12:07, Ondrejov] Message sent to BinAstPhotSurvey conference

· The Adrian's estimate of P=68.5 h (with an error ~0.5 h) from the linked Modra data is unique, assuming a PA rotation, despite a highly incomplete coverage:
http://www.asu.cas.cz/~ppravec/10772.png

Further (linked) data might be useful to nail it down. But it has a low priority within the BinAstPhotSurvey now, I don't pursue an extended campaign for this one here as its slow rotation has been already well established. Adrian, Bob, others, it is up to you to decide whether you work it more (long linked sessions, though they might be just a few points per night), or if we close it now.

Nice work, Adrian et al.!

Cheers, Petr [2006-03-25 13:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· I could observe through thin clouds for about 1 hour tonight and I chose this. P seems to be about 68.5 h. We could join our data with those by John and Bob. For binast it is probably not important. The question is if it is tumbling, or not. Perhaps it is not.

Adrian [2006-03-24 21:38, Modra] Message sent to BinAstPhotSurvey conference

· Observed for two short sessions about eight hours apart, and curve was rising through both sessions.

Bob Koff [2006-03-24 19:09, AntelopeHills]

· Since Sonoita is also on this asteroid, I will switch to another target tonight.

Bob Koff [2006-03-24 04:50, AntelopeHills] Message sent to BinAstPhotSurvey conference

· I was on this object tonight and the lightcurve was rising continuously. I estimate the period of about 70 h. So there is no need to stay on it the whole night - just two - three points (short sessions) per night is a good choice. But linked observations are recommended. :-)

Adrian [2006-03-24 04:26, Modra] Message sent to BinAstPhotSurvey conference

· Started a run here on 060324 at 3:30 UT .

John G [2006-03-24 03:46, Sonoita]

· Started a run on (10772) March 24 at 03:20 UT.

Bob Koff [2006-03-24 03:28, AntelopeHills] Message sent to BinAstPhotSurvey conference

· The weather doesn't allow me to do much photometry. I tried this object as it is high above horizon, then 4786 for a while, but now I'm back again as southern part of our sky here is far from being clear.

Adrian [2006-03-22 23:13, Modra] Message sent to BinAstPhotSurvey conference

· Oh yes, it appears to be a slow rotator. Long linked series will be needed for this one. A collaboration with a US station would be useful (Bob? This one is relatively bright, V~15.3). It might be conveniently alternated with another target as a continuous coverage is not necessary if its long period is confirmed.

Cheers, Petr [2006-03-20 08:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· It seems of a long period, during 4,5 hour run brightened slowly up of about 0,1 mag. Data sent to Petr.

Stefan/Jozef [2006-03-20 04:56, Modra]

· We started with this new target on Mar19, 22:22UT, because of its brightness that is slowly getting fainter. This is a first probe. As we know, nothing is known about it, yet...

Stefan/Jozef [2006-03-19 22:46, Modra] Message sent to BinAstPhotSurvey conference

(31383) 1998 XJ94 (Finished) [Add new note]
· Nice work, David. I'm marking it here as finished. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

No hurry with that, but please don't forget to send to me or Peter K. (who checked an analysis of your first two nights for the object here) data from your nights 04/05 and 04/08; I need to extract coverage data for all Survey targets with periods less than 5 hours for modeling of the Survey. Thanks.

Cheers, Petr [2006-04-09 08:42, Ondrejov] Message sent to BinAstPhotSurvey conference

· Full session achieved with good data. Period resolved is 4.16783 +/- 0.00018hrs amplitude 0.60 +/- 0.02 (previously announced period was an error due to my failure to look at periods below 4.17hrs)

No deviations noted and target has multiple coverage. Target is finished

http://www.david-higgins.com/Astronomy/asteroid/images/31383LC.gif [2006-04-09 02:08, HuntersHill] Message sent to BinAstPhotSurvey conference

· Starting what shoudl be the final run at 09:45UT. Sharing this run with 2501 Lohja. [2006-04-08 11:22, HuntersHill]

· Recovering from a disaster (Obs PC went down with all software/settings/system calibrations et al) I did a trial run on 31383 and got a little over 2 hours data that conforms to the exiting plot. (Great sky but strong winds closed the observatory after that 2 hours)

Period 4.17000 +/- 0.00006hrs amplitude 0.58 +/- 0.02mag.

http://www.david-higgins.com/Astronomy/asteroid/images/31383LC.gif [2006-04-05 22:24, HuntersHill] Message sent to BinAstPhotSurvey conference

· Completed run at 18:00UT due to cloud. Semi crowded field but good data perfectly matching the first night resolving a period of 4.170 +/- 0.001hr, Amp 0.58 +/- 0.02mag

No deviations seen in the curve.

http://www.david-higgins.com/Astronomy/asteroid/images/31383LC.gif [2006-04-02 22:28, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced run at 10:00UT April 2 in poor conditions [2006-04-02 11:51, HuntersHill]

· Commenced run at 10:00UT and finished run at 18:20UT. Solid period with good data. Period 4.162 +/- 0.007 hrs, amp 0.56 +/- 0.02mag.

http://www.david-higgins.com/Astronomy/asteroid/images/31383LC.gif [2006-04-01 21:50, HuntersHill] Message sent to BinAstPhotSurvey conference

(6361) 1978 VL11 (Finished) [Add new note]
· The last gap in the double coverage for this one has been covered by Stefan Galdos from Modra on the past night. Nine of the ten sessions for this one fit well with the single period (9.1122 h), a few deviations up to +/-0.05 mag seen in one session by Bob Koff have not a character of a binary. Though they remain unexplained, we don't consider them as an indication of something special in the asteroid. It is finished for the Survey, I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work all!

Cheers, Petr [2006-03-21 09:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006-3-2.1 by me,
2006-3-3.2 by Brian Warner
and both datasets don't show nothing unusual, see: http://www.asu.cas.cz/~asteroid/06361.png

I think we will close this target soon. Deviations in Bob Koff's data from 2006-2-22.3 were not confirmed. If we formaly exclude them there is already one short 'gap' not covered twice. It's around the phase of 0.49 and will be good to cover it again to finish this target.

Here is an ephemeris for next days before the Moon will be too close (at least 3-hours long run centered at this times is needed):

2006-03-06 01.831 UT
2006-03-06 10.943
2006-03-06 20.055
2006-03-07 05.167
2006-03-07 14.279
2006-03-07 23.391
2006-03-08 08.503
2006-03-08 17.616
2006-03-09 02.728
2006-03-09 11.840
2006-03-09 20.952
2006-03-10 06.064

Peter K. [2006-03-05 10:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing from 1:30 UT (after finishing 1717) and expecting 2.5-hour long run. Peter K. [2006-03-02 02:21, Ondrejov]

· Data from one more night (2006-02-28.1, Modra) were added. They agree well and no deviations are visible. Image bellow was updated.

Peter K. [2006-03-01 20:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Brian Warner's new data from 2006-02-28.3 and 2006-03-01.3 (4.5 and 7.4 hour long runs) agree well with period 9.11 h, see http://www.asu.cas.cz/~asteroid/06361.png

No new deviations seen but more data, to confirm those seen in Bob Koff's 2nd night, are still needed.

Peter K. [2006-03-01 19:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· Assuming the good weather predicted for the next couple of days actually happens, I'll work this with the 0.5m scope. [2006-02-27 15:56, PalmerDivide]

· Bob Koff's observations (3 nights) have shown a unique period of 9.11 h, but there were deviations on at least one night, see
http://www.asu.cas.cz/~ppravec/6361.png
points around phases 0.16, 0.43, and possibly also around 0.63. They are greater than our nominal limit of 0.04 mag, so we need to explain them. Bob hasn't found any observational problem with the data, so we must consider that the deviations are real and we need to confirm them with observations with higher accuracy. Two or three full nights with errors not greater than 0.02 mag (note that the asteroid is 1+ mag dimmer than predicted by the MPC) are needed to confirm the deviations seen in the Bob's data.

Fyi, I will be distracted by other matters for the rest of lunation starting on Wednesday, so my role of joint data analyser for this one will be done by Peter Kusnirak here (peter@asu.cas.cz) during the time I will be away. So, send your data to him directly so that he may join them together right away.

Cheers, Petr [2006-02-27 09:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Results so far for 6361 are a period of 9.11 hours with an amplitude of about 0.6 mag. The lightcurve shape looks ordinary.

This asteroid appears to be much dimmer than predicted, ranging from approximately 15.8 to 16.4 magnitude. I'm using 180-second integrations to get .02 - .03 photometry. If not for the good amplitude, I couldn't work it.

I plan on taking one more night tonight, to get close to double coverage, and then I'll send the data to Petr.

Bob Koff [2006-02-22 19:37, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Planning on a second night of observations of 6361 tonight.

Bob Koff [2006-02-22 01:04, AntelopeHills]

· Planning to start this asteroid tonight, 2/21 UT.

Bob Koff [2006-02-20 23:45, AntelopeHills] Message sent to BinAstPhotSurvey conference

(2274) Ehrsson (Finished) [Add new note]
· The slow rotation (P=78 h) of this one has been well established here, see
http://www.asu.cas.cz/~ppravec/2274.png
It is sufficient for the Survey. Further observations would be useful only if accurately linked (to establish its PA or NPA rotation), but it is outside the scope of the binary survey. So, we are closing it here now. A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work all on this slow rotator!

Cheers, Petr [2006-03-17 10:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed 2274 from 10:55UT to 18:12UT. Data sent to Peter. [2006-03-09 21:23, HuntersHill]

· I just finished joining of all data I have (please check if it is all):

4 short nights from Skalnate Pleso (2006-2-24.1, 3-2.1, 3-3.1 and 3-6.0),
3 nights from David Higgins (Hunters Hill, 2006-3-5.6, 3-6.6 and 3-7.6),
5 linked(!) nights from Bob Koff (Antelope Hills, 2006-3-3.3, 3-4.3, 3-5.3, 3-6.3 and 3-7.3), they are crucial for the analysis,
2 short (also linked) night from Modra (2006-3-7.0 and 3-8.0),

Most of them fits well with single period solution and period of 79.27 hour, see: http://www.asu.cas.cz/~asteroid/02274.png

Data not fitting well are: first night from Skalnate Pleso but is was six days before the rest and this deviation may be explained by changing aspect. Another not fitting part is around the phase 0.77 but both datasets were re-checked and look OK.

As (1717) Arlon is not observable now (2274) is the primary target for the rest of this lunation. We need more data to confirm that deviations if they are real. So, if you can do it!

May it be binary? It has a long period and large amplitude to be an ordinary binary, but who knows...

Nice work all!

Peter K. [2006-03-08 13:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· We tried to link our short runs from the last two nights.
Adrian & Stefan [2006-03-08 08:54, Modra]

· Observed from 11:03 to 18:16 UT and got an entire peak. My guestimate is around 85hrs for this one. [2006-03-07 21:22, HuntersHill] Message sent to BinAstPhotSurvey conference

· Observed 2274 from 04:55 to 11:20. Continuous upward trend.

Bob Koff [2006-03-07 15:26, AntelopeHills]

· Skies cleared enough to start observing 2274 at 05:00 UT.

Bob Koff [2006-03-07 05:18, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Observed about 2 hours, ended previously due to clouds.

Stefan [2006-03-07 01:08, Modra]

· Started with this long period case on Mar06, 21:34UT, conditions are not best. We follow jumping around the world, too. After SkPl, AHills, HHill, we are back in Europe :-) Who will be next?

Stefan [2006-03-06 22:25, Modra] Message sent to BinAstPhotSurvey conference

· Observed 2274 between 11:42UT and 18:10UT. Curve pitched down over the entire session. [2006-03-06 21:15, HuntersHill]

· Began observing 2274 at 04:45 UT, and curve look like it was just reaching maximum. The curve declined for the rest of the run under partly cloudy conditions.

My guess is a period of around 78 hours. I've sent linked observations from all nights to Peter.

Bob Koff [2006-03-06 15:20, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Planning to observe 2274 tonight, March 6, from about 05:00 to 11:30 UT. Will try to link my sessions tonight.

Last night I observed from 05:30 to 11:30, so Hunters Hill picked it up about the time I left off. Between us we have almost 13 hours of continuous uptrend. If the lightcurve is bimodal and symmetrical, we're looking at a period in excess of 52 hours. [2006-03-05 22:42, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Observed 2274 from 11:50 UT to 18:18 UT displaying a continuous upward trend. [2006-03-05 22:26, HuntersHill]

· Observed 2274 for 6 hours. Continuous upward trend in lightcurve. Last two hours compromised by interfering stars and clouds. Hope to observe again tonight, 3/6 UT. [2006-03-05 12:24, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Observed 2274 for about 6.5 hours. Lightcurve showed an inflection point at a maximum. No anomalies so far. Will resume observations tonight if possible. Peter, I'll send in observations as soon as I am able to link them night-to-night.

Bob Koff [2006-03-04 13:40, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Observed 2274 from 05:05 to 09:53. Lightcurve descending througout the run. With Skalnate Pleso observations, that is almost 9 hours of descending lightcurve.

I will resume observing 2274 tonight if possible.

Bob Koff [2006-03-03 14:44, AntelopeHills] Message sent to BinAstPhotSurvey conference

· Started observing 2274 at 05:00 UT on March 3

Bob Koff [2006-03-03 05:15, AntelopeHills]

(85804) 1998 WQ5 (Finished) [Add new note]
· Current observing circumstances for this one don't allow us to get enough observations to resolve this one, it remains U=1. Not good enough to be included into the Survey's sample. I'm closing it here now.

Petr [2006-03-16 16:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yes, a few periods are still possible, the new noisy data didn't help to resolve it. Well, accurate data with errors <0.02 mag, long sessions, are needed to nail it down.

Clear Skies, Petr [2006-01-11 09:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Got a third night night of data but a system failure cut the session in half. Hopefully this is an isolated incident perhaps due to the very hot conditions (last nights minimum was 26c. Session commenced at 31c (at 11.30pm)

Not sure if the data is of much use because it was very difficult to attain focus and the resultant SNR meant an average of +/- 0.04mag. The data roughly fit 4.10, 3.74, 5.62 and 6.29 hrs in order of best fit

Data has been sent to Petr for what it's worth. [2006-01-10 20:52, HuntersHill] Message sent to BinAstPhotSurvey conference

· David sent me his two nights for 85804 (each about 4.5 h long). Well, the period is not unique, I'm getting a formally best fit with a period of 3.71 h, see
http://www.asu.cas.cz/~ppravec/85804.png
but a few other periods are possible. More data (errors <0.02 mag, long sessions) are needed to nail it down. Particularly useful would be data from a different longitude, so if someone can spare some time from Arlon and Bascom, this one is a good target.

Cheers, Petr [2006-01-09 08:01, Ondrejov] Message sent to BinAstPhotSurvey conference

· 2nd night - average data due to clouds and high temps but the data has resulted in a period of 4.024 +/- 0.009hrs with an amplitude of 0.1 mag +/- 0.03mag.

The 120 second integrations solved the trailing problem.

On hot nights I am having hot pixel problems (even though the ST-8E is cooled to the same set temp -10c) I have had to resort to calibrations in MaxIm using a Bad Pixel Map to kill the 'hot pixels' that the darks are not removing! [2006-01-08 21:37, HuntersHill] Message sent to BinAstPhotSurvey conference

· 85804 is an NEO. It was moving a little fast for my 240 second exposures producing short trails but Canopus seems to have coped with it. Initial analysis shows a period of around 4.1 hours with an amplitude around 0.1mag.

Given the trail - I could reduce my exposures to 120 sec for the same SNR!

http://www.users.bigpond.com/higginsdj/85804-1998WQ5.htm [2006-01-08 01:46, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started 1st night at 11:30UT. Doing this target and (6084) Bascom. [2006-01-07 13:27, HuntersHill]

(7088) Ishtar (Finished) [Add new note]
· This binary NEA is V>17 during this lunation, too faint for useful follow-up observations. Closing it now.

Cheers, Petr [2006-03-16 15:52, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data by Vishnu and Ron of 2006-02-01.3 have further refined the solution for orbital period:
Porb = 20.63 +/-0.01 h.
http://www.asu.cas.cz/~ppravec/ishtar_all.png
http://www.asu.cas.cz/~ppravec/ishtar_longpc.png
http://www.asu.cas.cz/~ppravec/ishtar_shortpc.png
http://www.asu.cas.cz/~ppravec/ishtar_contacts.png
Other parameters didn't change significantly since the CBET discovery announcement.

Cheers, Petr

PS: I should write on how to follow up this as well as our other recent binaries later on. [2006-02-14 13:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Just completed 6+ hours at Badlands.

Ron & Vishnu [2006-02-01 13:27, Vishnu Reddy/Tucson]

· Began run at 4:30 UT and hope to get in 6+ hours.

Ron & Vishnu [2006-02-01 04:28, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Our discovery announcement has been published on CBET 384. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
The text of the CBET is copied below for your convenience.

Cheers, Petr

(7088) ISHTAR
V. Reddy, Department of Space Studies, University of North
Dakota, Grand Forks; R. Dyvig, Quinn, SD; P. Pravec and P. Kusnirak,
Ondrejov Observatory; and S. Gajdos, A. Galad, and L. Kornos, Modra
Observatory, report that photometric observations obtained during
2006 Jan. 23 to 29 reveal that minor planet (7088) is a binary
system with an orbital period of 20.65 ± 0.02 hours. The primary
rotates with a period of 2.6790 ± 0.0002 hours, and its
lightcurve amplitude of 0.11 mag is indicative of a nearly spheroidal
shape. The secondary is moderately elongated, and it rotates
synchronously with orbital motion. Mutual eclipse/occultation events
that are 0.18- to 0.21-mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.42 ± 0.02.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2006 CBAT
2006 January 31 (CBET 384) Daniel W. E. Green [2006-01-31 14:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Calibrated R data by Peter K. here resulted in obtaining an estimate for its mean total H_R=16.5 +/-0.2 assuming G=0.15 +/-0.2. Assuming V-R=0.4 +/-0.1, it gives H=16.9 +/-0.3.

Cheers, Petr [2006-01-31 12:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· Thanks to all for helping on this one. Sky conditions turned cloudy here at Badlands, preventing us from filling in the missing pieces!

Ron [2006-01-29 15:40, Vishnu Reddy/Tucson]

· New data by Leos Kornos from Modra of 2006-01-29.0 joined in. They cover most of the missing phases between the events, nailing down the solution for the secondary rotation. An updated solution:
Pprim = 2.6790 +/-0.0002 h
Porb = 20.65 +/-0.02 h
Aprim = 0.11 mag
Asec = 0.10 mag
Ds/Dp = 0.42 +/-0.02
http://www.asu.cas.cz/~ppravec/ishtar_all.png
http://www.asu.cas.cz/~ppravec/ishtar_longpc.png
http://www.asu.cas.cz/~ppravec/ishtar_shortpc.png

Very nice work all! We are preparing a discovery announcement on this one.

Cheers, Petr [2006-01-29 14:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined in:
2006-01-26.3 by Ron and Vishnu from Badlands
2006-01-28.0 by Adrian from Modra
The Adrian's data fit well and they complete a second coverage of the event. The Ron&Vishnu's data show a few deviations, but I suspect that they may be just observational artifacts; we will look at it together. The current solution is:
Pprim = 2.6791 +/-0.0002 h
Porb = 20.65 +/-0.02 h
Aprim = 0.11 mag
Asec ~ 0.08 mag (to be nailed down when the coverage is completed; see below)
Ds/Dp = 0.43 +/-0.03 (to be refined after coverage is completed, also after re-visiting the 01-26.3 data)
http://www.asu.cas.cz/~ppravec/ishtar_all.png
http://www.asu.cas.cz/~ppravec/ishtar_longpc.png
http://www.asu.cas.cz/~ppravec/ishtar_shortpc.png

So, the present situation with this one is such that all but one dataset fits well with the current solution, and that 2/3 of the orbital period have been covered well. Assuming that our revisiting of the dataset of 01-26.3 will confirm my suspicion that the few deviations there are just observational problem, we are about to finish a discovery phase for this one. Of course, covering the missing part of the curve is needed to nail down the solution for the secondary's rotation, so if we can do it before we publish a discovery announcement on this one, it would be best, but I don't expect it will change the main things, so it is up to Vishnu and Ron (the discoverers of this one) whether they want to publish it now or wait until we complete the coverage. In any case, I'm enclosing ephemerides for phases 0.85 and 1.22 so that we can plan when to cover the phases missing coverage:

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-28 21.67 0.850
2006- 1-29 18.32 0.850
2006- 1-30 14.97 0.850
2006- 1-31 11.62 0.850
2006- 2- 1 8.27 0.850
2006- 2- 2 4.92 0.850
2006- 2- 3 1.57 0.850
2006- 2- 3 22.22 0.850
2006- 2- 4 18.87 0.850
2006- 2- 5 15.52 0.850

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-29 5.31 0.220
2006- 1-30 1.96 0.220
2006- 1-30 22.61 0.220
2006- 1-31 19.26 0.220
2006- 2- 1 15.91 0.220
2006- 2- 2 12.56 0.220
2006- 2- 3 9.21 0.220
2006- 2- 4 5.86 0.220
2006- 2- 5 2.51 0.220
2006- 2- 5 23.16 0.220

Cheers, Petr [2006-01-28 11:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· I think our 01/26/06 data from Badlands will have also covered the 0.75 event. Vishnu is now enroute to Mauna Kea for observing, but I think he plans on sending it to you from there (possibly Saturday).

Ron [2006-01-27 13:32, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Data by Peter K. from here of 2006-01-27.0 joined in. The solution is now:
Pprim = 2.6786 +/-0.0004 h
Porb = 20.66 +/-0.02 h
Aprim = 0.10 mag
Asec ~ 0.09 mag (to be nailed down when the coverage is completed)
Ds/Dp ~ 0.43 (to be nailed down after the coverage is completed).
The current solution see following pictures:
http://www.asu.cas.cz/~ppravec/ishtar_all.png
http://www.asu.cas.cz/~ppravec/ishtar_longpc.png
http://www.asu.cas.cz/~ppravec/ishtar_shortpc.png
A small difference between the two events (also an apparent plateau at the bottom of the one around orbital phase 0.75) needs to be confirmed with a second coverage of the 0.75-phase event so that we can resolve which one is primary and which is secondary. After completing its coverage as well as that of the phases between the two events (orbital phases 0.8-1.2), we can publish this one. It may go fast as it looks.

Cheers, Petr [2006-01-27 09:43, Ondrejov] Message sent to BinAstPhotSurvey conference

· My run was only 5.7-h long because I had to finished at 2:45 UT due to near bright star. But part of the event at 0.75-phase was captured. [2006-01-27 04:51, Ondrejov]

· Observing from 21 UT and expecting full-night run (8 hours). [2006-01-26 21:34, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data by Ron and Vishnu from Badlands of 2006-01-25.3 joined in. An updated solution see following pictures
http://www.asu.cas.cz/~ppravec/ishtar_all.png
http://www.asu.cas.cz/~ppravec/ishtar_longpc.png
http://www.asu.cas.cz/~ppravec/ishtar_shortpc.png
The new data have covered the other event (around orbital phase 0.75 in the pictures above; the previous two observed events were about orbital phase 0.25). Both periods appear unique now, but we need to complete the coverage so that we nail down the solution for the rotation of the secondary. (It also affects an estimation of Ds/Dp; a preliminary estimate is 0.42, but it will be refined.) When all orbital phases are covered well, we will announce this one on CBET, it might go fast in this case. Ephemerides for the events are enclosed below, but we need to cover also phases outside eclipses, so don't confine your observations to just around the events; full night runs constrain the solution best.

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-26 16.11 0.255
2006- 1-27 12.77 0.255
2006- 1-28 9.43 0.255
2006- 1-29 6.09 0.255
2006- 1-30 2.75 0.255
2006- 1-30 23.41 0.255
2006- 1-31 20.07 0.255
2006- 2- 1 16.73 0.255
2006- 2- 2 13.39 0.255

Date/Time UTC (LTc.) Phase
--------------------------
2006- 1-27 2.49 0.758
2006- 1-27 23.15 0.758
2006- 1-28 19.81 0.758
2006- 1-29 16.47 0.758
2006- 1-30 13.13 0.758
2006- 1-31 9.79 0.758
2006- 2- 1 6.45 0.758
2006- 2- 2 3.11 0.758
2006- 2- 2 23.77 0.758

Cheers, Petr [2006-01-26 09:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· Commenced observing run at 4:15 UT from Badlands. We hope to get in ~ 4h before clouds move in.

Ron [2006-01-26 04:44, Vishnu Reddy/Tucson]

· We observed Ishtar regularly on Jan. 25 between 5:40UT and 14:18UT (sampling ~25 min), integration time ~200 s with the Lick-1m
good weather and seeing conditions... [2006-01-25 14:56, Marchis] Message sent to BinAstPhotSurvey conference

· Data by Stefan Gajdos from Modra of 2006-01-24.9 joined in; another event caught. An updated preliminary solution (with the long period being plotted at half of its real value) see following pictures
http://www.asu.cas.cz/~ppravec/ishtar_all.png
http://www.asu.cas.cz/~ppravec/ishtar_longpc.png
http://www.asu.cas.cz/~ppravec/ishtar_shortpc.png
The short period appears to be unique (2.679 h). The long period needs to be nailed down, but it appears to be near 20.7 h.

Cheers, Petr [2006-01-25 11:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Run completed at 11:30 UT covering ~ 7 hrs, except for a gap due to observer falling asleep at the wheel! :( I hope someone else covered the gap! I didn't get my afternoon nap today!

Ron [2006-01-25 11:42, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Run commenced at 4:30 UT from Badlands. We hope to achieve 6+ hours, with relatively clear skies.

Ron [2006-01-25 04:54, Vishnu Reddy/Tucson]

· We will observe it with the Lick 1m telescope tonight (Jan 25 UT). We will start at 05:30UT and stop at 13:30 UT.
this night should be clear.
F. [2006-01-25 02:38, Marchis] Message sent to BinAstPhotSurvey conference

· Data by Vishnu and Ron from Badlands of 2006-01-24.3 joined in. They show deviations from a single periodicity again, though not as large as in the night of 01-23.3; it looks like no deep event in the new night occured. A tentative solution see following pictures:
http://www.asu.cas.cz/~ppravec/ishtar_all.png
http://www.asu.cas.cz/~ppravec/ishtar_longpc.png
http://www.asu.cas.cz/~ppravec/ishtar_shortpc.png
The short period may be relatively well established, but the longer period is mostly a guess (and it is set at half value in the pictures above). More data (best if catching another deep event :-) ) are needed to confirm this one.

Cheers, Petr [2006-01-24 18:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· To add to the Ron's announcement of their finding of the possible new binary, I present following three pictures. The first one shows the one night data showing the interesting behavior:
http://www.asu.cas.cz/~ppravec/ishtar_all.png
A VERY tentative deconvolution (might be entrirely wrong) of its two components see following pictures:
http://www.asu.cas.cz/~ppravec/ishtar_longpc.png
http://www.asu.cas.cz/~ppravec/ishtar_shortpc.png
So, this is to encourage you here to observe the Amor, to confirm and resolve the behavior of the one Badlands night.

Cheers, Petr [2006-01-24 09:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Vishnu and Ron would like to report that we began a 3rd night on this target from Badlands at 5:30 UT tonight and should get in a complete 6-hour session. Vishnu has sent preliminary data to Petr, who has indicated the possibility of superimposed components and a possible binary. The first night was compromised by clouds.

Ron [2006-01-24 09:18, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

(3260) Vizbor (Finished) [Add new note]
· Don Pray's observations on six nights has shown it to be a slow rotator (P~64 h, U=2). It is sufficient for the Survey, so we are closing it here now. A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2006-02-23 09:39, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one tonight, Feb 22.

Don [2006-02-22 00:11, CarbuncleHill]

· Doing this one tonight, Feb 21.

Don [2006-02-20 22:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Doing another run on this one.

Don [2006-02-20 01:17, CarbuncleHill]

· Doing this tonight under windy but clear conditions.

Don [2006-02-19 01:02, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· The single night data by Don indicate a period longer than 10 h, but perhaps not much longer. Since weather forecast is poor for him for following nights, I encourage others to help out with this one. Long sessions are needed, best if linked, but even unlinked ones may contribute well.

Cheers, Petr [2006-01-30 11:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started this one tonight. I chose this one for my 0.25m scope because the remaining "official" targets are too dim.
3260 seems to meet the criteria for being a survey target. [2006-01-29 02:23, CarbuncleHill] Message sent to BinAstPhotSurvey conference

2003 SA224 (Finished) [Add new note]
· This one has been closed at U=2 (OK within the Survey for its long period). A note on it has been added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-02-15 09:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Three nights by Vishnu and Ron from Badlands and two nights by Peter K. from here joined in. The two Peter's sessions have been linked together, and one of the three nights by Vishnu&Ron was approximately tied to the same magnitude scale as it followed (though not actually overlaped) one of the Peter's nights. The data don't fit together for any period if we assume a bimodal lightcurve. For lightcurve shapes with more than two maxima/minima per period, some long periods (tens hours) fit, but there is also a possibility that it is actually a tumbler with a dominating period around 27 or around 35 hours.

Giving that our survey is not aimed to study slow rotators/tumblers, and also that describing such object well would require to take several long linked sessions, the current state of our work on this object is sufficient for the BinAstPhotSurvey. Unless someone plans to take more linked observations, we may close this one at its current state (U=2, PAR=0).

Petr [2006-02-06 13:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hmmm...so much for my ability to predict the weather! Clouds moved in sooner than I thought! I'm closing for the night at 8:10 UT.

Cheers,

Ron [2006-02-03 08:03, Vishnu Reddy/Tucson]

· Started observing ~ 6:35 UT. Bright star will compromise early images, but will improve after that. Weather looks good for at least 4 hours.

Vishnu & Ron [2006-02-03 06:55, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Just completed 6 hour run from Badlands...clouds were not a problem.

Vishnu & Ron [2006-02-02 13:31, Vishnu Reddy/Tucson]

· Data by Vishnu&Ron from Badlands of 2006-01-30.4 that is a 5.8-h long session show a well defined minimum, so there is a consistency between the Badlands and the Ondrejov data, but there are of course a lot of possible periods satisfying them, since they are three days apart and not too long sessions. More data are needed to establish this one.

Cheers, Petr [2006-02-02 13:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· Peter K. has taken a 2.8-h long session for this Amor on 2006-02-02.2 (after finishing the session on Bascom). His data show a continuous decrease (but with a changing slope; the second derivative is positive, so he might be approaching a minimum) by 0.10 mag during the 2.8-h interval. Assuming a symmetric bimodal lightcurve gives an approximate lower limit of 11 hours, but it may be shorter or (maybe much) longer. In any case, more data are needed to establish this one.

Cheers, Petr [2006-02-02 09:58, Ondrejov] Message sent to BinAstPhotSurvey conference

· Commenced observing run at 6:45 UT. Hope to get in ~6 hours. Some images may get compromised by passing clouds.

Vishnu & Ron [2006-02-02 06:46, Vishnu Reddy/Tucson]

· Completed 2nd night with 6 hours, but many of the images were compromised by clouds.

Ron [2006-01-31 13:13, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· Began run at 6:35 UT. Hope to get in 6 hours.

Ron [2006-01-31 06:35, Vishnu Reddy/Tucson]

· Just started our first night on 2003 SA224. Should get at least 6 hours worth of data.
Vishnu & Ron [2006-01-30 07:04, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

(15362) 1996 ED (Finished) [Add new note]
· Observations from Brian Warner at Palmer Divide and Bob Stephens at GMARS over seven nights between 2006-01-28 and 2006-02-06 show the period to be 31.4 hours with an amplitude of 0.5 magnitudes. No significant deviations were seen. Athough a couple more nights would refine the period, we are declaring it finished for the survey. [2006-02-07 01:27, Santana] Message sent to BinAstPhotSurvey conference

· %^&* clouds again! Still, I got enough data on both nights to see that 30h is a reasonable solution. I've asked for Bob Stephens' data. I'll keep working this as weather allows. [2006-02-02 07:33, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Only a short run on early Feb 2 UT because of clouds. I'll try again, Feb 3 UT, though clouds might move in again sometime over night. [2006-02-02 00:30, PalmerDivide]

· Started imaging about 2:00 UT. Assuming clouds hold off, I'll get a 10 hour run. [2006-02-01 04:59, PalmerDivide] Message sent to BinAstPhotSurvey conference

· I'll be able to work this starting Feb. 1 (UT) or as weather allows. I'll get calibration images to link nights as well. [2006-01-31 16:33, PalmerDivide]

· A look at the Bob's two nights data confirms his finding that it is P>24 h, with a possible solution about 30 h. Bob cannot take more observations for it any time soon, so if someone could help out with a couple long nights (might be alternated with another target during the night), it would be useful.

Cheers, Petr [2006-01-31 07:19, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observered from GMARS on 2006-01-28 and 2006-01-29 getting 8 hours and 6 hours of data respectively. I had trouble with high thin clouds from time to time on both nights. The seeing and transparency was generally poor. The period is long, with a single extrema observed on each night. The period exceeds 24 hours, with about 30 hours being a possible fit assuming the two observed maximums are are same. The observed amplitude is 0.45 magnitudes, however no minimums were observed. [2006-01-29 21:47, Santana] Message sent to BinAstPhotSurvey conference

(3267) Glo (Finished) [Add new note]
· This one has been done well by Marek Husarik et al. from Skalnate Pleso and by Jozef Vilagi and Leos Kornos from Modra. Unique period, double coverage, no significant deviation seen. Well done for the Survey. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work, guys!

Cheers, Petr [2006-02-01 10:06, Ondrejov] Message sent to BinAstPhotSurvey conference

(2094) Magnitka (Finished) [Add new note]
· Well done by Peter K. from here and by Don from Carbuncle, analyzed by Peter K., unique period, double coverage, no deviation indicating a binarity. Well done for the Survey and finished. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys!

Cheers, Petr [2006-01-29 09:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from 1:15 to 4:30 UT and completed double coverage of all phases. No deviations visible and this one should be finished.

Peter K. [2006-01-29 07:04, Ondrejov]

· Observed this on 1/27. Parameters agree with Peter Kusnirak's findings. Will be doing a run on it tonight (1/28). [2006-01-27 23:28, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Finished my third night (one of them very short) on this target. It was done for approx. 2 hours after finishing 6084 or 7088. Current data are confirming my results from the last opposition (10/2004, 3 nights) when it was observed within the field of another targeted asteroid. 2004's observations revealed period of 6.1125 h and amplitude of 0.94 mag. Current data shows period of 6.11 h and amplitude of 0.82 mag but almost 40% of rotational phases are still not covered. [2006-01-27 05:19, Ondrejov] Message sent to BinAstPhotSurvey conference

(6185) 1987 YD (Finished) [Add new note]
· Observations by Bob Stephens from GMARS, by Stefan Gajdos from Modra, by Peter Kusnirak from here, and from Skalnate Pleso have revealed a period of 21.05 h (U=3-). Well done for the Survey. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys!

Cheers, Petr [2006-01-25 10:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Continuing in Peter`s effort, observing from 21:39 UT and expecting full run up to morning.

Stefan [2006-01-24 01:51, Modra]

· Observing from 18 UT and expecting 2-hours long run. [2006-01-23 18:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed from Goat Mountain Astronomical Research Station on Friday and Saturday nights (2006-01-21 and 2006-01-22). Period appears to be in the 18 to 22 hour range with an amplitude of 0.8 magnitudes. [2006-01-22 19:59, Santana] Message sent to BinAstPhotSurvey conference

4222 Nancita (Finished) [Add new note]
· This one has been well done by Ron and Vishnu from Badlands and by David from Hunters Hill, see a joint solution:
http://www.asu.cas.cz/~ppravec/nancita.png
Unique period solution (3.8732 +/-0.0003 h), doubly covered, no deviation greater than our nominal limit (0.04 mag) for detection of binaries seen, so this one is well done and finished for the Survey. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys!

Cheers, Petr [2006-01-22 12:03, Ondrejov] Message sent to BinAstPhotSurvey conference

· Another 6 hr session completed. Nothing special noted. Period refined to 3.873hr +/- 0.002hrs

http://www.users.bigpond.com/higginsdj/4222Nancita.htm [2006-01-22 00:46, HuntersHill]

· Thunderstorm has passed but left hot and humid conditions plus scattered cloud. Planning a run tonight. [2006-01-21 11:01, HuntersHill] Message sent to BinAstPhotSurvey conference

· Just completed ~4 hours at Badlands. WE had to terminate because of clouds and wind. [2006-01-21 09:23, Vishnu Reddy/Tucson]

· Completed a 6 hour run at Hunters Hill. Some cloud to increase SNR here and there but a definite period of 3.86 hrs +/- 0.01hrs with an amplitude just a little under 1.0 mag +/- 0.01mag.

http://www.users.bigpond.com/higginsdj/4222Nancita.htm

Forcast for Hunters Hill is thunderstorms so I do not know if I will be able to cover it a second night. [2006-01-21 01:12, HuntersHill] Message sent to BinAstPhotSurvey conference

· I completed a 6 hour run at Santana Observatory. Field stars interrupted observations three times, but the period appears to be around 3.8 hours with an amplitude of around 0.8 magnitudes. [2006-01-20 16:09, Santana] Message sent to BinAstPhotSurvey conference

· Completed 6 hour run. We will try again tonight. [2006-01-20 11:33, Vishnu Reddy/Tucson]

· Commenced run at 11:20 UT but I am not confident of a long session. [2006-01-20 10:47, HuntersHill] Message sent to BinAstPhotSurvey conference

· We (Vishnu and Ron) began a run at Badlands on 4222 Nancita about 4 hours ago...should be able to get about 3 additional hours tonight. [2006-01-20 08:45, Vishnu Reddy/Tucson]

(24814) 1994 VW1 (Finished) [Add new note]
· This one has not been determined well enough for the BinAstPhotSurvey, and it is already too faint to get needed data with errors <0.01 mag with our instruments now, so I'm closing it here now.

Petr [2006-01-17 10:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· The David's data (three nights) didn't bring a unique solution, partially because of low amplitude of the asteroid and also because the nights were not consecutive (their length of 6+ hours was, however, fine). One of possible periods, assuming a bimodal lightcurve, see
http://www.asu.cas.cz/~ppravec/24814.png
As David has noted, the first and third nights fit together well, while the 2nd night shows some deviations. They may be due to an observational problem (presence of a bright field star), and their amplitude is also below our nominal detection limit for binaries (minimal deviation amplitude of 0.04 mag), but it would be good to solve the case well with two consecutive nights with errors <0.01 mag with a larger telescope (Gianluca 0.8m from Campo Catino or Peter K 0.65m from here) in the next lunation, best if reinforced with a single nearby night (errors <0.02 mag) from a different longitude. Such two/three consecutive nights should nail down the period (leaving no more than perhaps just an ambiguity with number of extrema per rotation there) and they should also show whether the lightcurve is strictly periodic or if the small deviations in the Dec09 lightcurve meant something.

Cheers, Petr [2005-12-12 09:30, Ondrejov] Message sent to BinAstPhotSurvey conference

· 7 hour run reduced and prodcued a similar curve to that obtained on 1/12. I will remeasure my data from 9/12 to see if I can see any errors. [2005-12-11 21:10, HuntersHill]

· Commenced run 10:15UT. According to the infrared satellite animation I should get a 6-7 hr run completed before the clouds roll in! [2005-12-11 12:35, HuntersHill] Message sent to BinAstPhotSurvey conference

· Completed a 7 hour run last night. Reduced it and added it to the night of 01 Dec but can not make head or tail of the data. [2005-12-10 11:18, HuntersHill]

· Commencing run on target at 10:15 UT. If current weather holds I will get another 6-7 hr run. [2005-12-09 10:13, HuntersHill] Message sent to BinAstPhotSurvey conference

· Unable to follow up due to storms. [2005-12-02 11:56, HuntersHill]

· Commenced run 10:20 UT 2005.12.01
Full run observed and data analysis shows a very low amplitude curve around 6 hour period (0.06 +/- 0.005mag) or just noise on a very long period object!

http://users.bigpond.com/higginsdj/24814-1994VW1.htm [2005-12-01 21:19, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started 10:15 UT. I'm not expecting a long session. [2005-12-01 10:37, HuntersHill]

(5080) Oja (Finished) [Add new note]
· This one has been well done (P=7.222 h, U=3) by Don Pray from Carbuncle Hill and by Adrian Galad and Stefan Gajdos from Modra. A unique period, double coverage, no deviation seen. A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, guys!

Cheers, Petr [2006-01-11 09:10, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two recent nights (the second was short) added and linked from Modra.

Adrian and Stefan [2006-01-11 02:31, Modra]

· Don Pray has taken a single night of 2005-12-31.2 (session 6.1 h long) for this one, but then he got an unexpected poor weather so he was not able to take a second night to nail it down. The single night's data suggest a period of ~7 h and amplitude of ~0.4 mag. If someone can help out with two nights (each at least a few hours long, but preferrably full night to get a double coverage, errors of 0.03 mag or better), it would be helpful.

Clear Skies, Petr [2006-01-03 10:36, Ondrejov] Message sent to BinAstPhotSurvey conference

(1950) Wempe (Finished) [Add new note]
· This one has been well done (P=16.79 h, U=3) by Don Pray from Carbuncle Hill with a contribution by Stefan Gajdos from Modra. A note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, guys!

Cheers, Petr [2006-01-10 18:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Doing this one tonight Dec 11, weather permitting. This appears to be a high amplitude object.

Don [2005-12-10 22:43, CarbuncleHill]

· Attempting a first run on this tonight.

Don [2005-12-10 03:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

2005 JE46 (Finished) [Add new note]
· This one is already too faint for us to nail it down with two long nights with errors <=0.03 mag, so I close it here now.

Petr [2006-01-03 15:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· The David's data suggest a period of 10.5 h, but it is not unique, a U=1+ result. See a composite on
http://www.asu.cas.cz/~ppravec/2005je46.png
The asteroid will be still observable after the Full Moon, and two long nights with errors of 0.03 mag or better from a northern station could nail it down. It will be, however, about V=17 and fading by 0.1 mag/day, so it is not much likely that we will succeed to take the two needed nights. In its current shape, it doesn't enter into the BinAstPhotSurvey sample.

Petr [2005-12-12 12:13, Ondrejov]

· Plotted the data removing some 'probable' bad points.

http://users.bigpond.com/higginsdj/2005JE46.htm [2005-12-11 02:25, HuntersHill] Message sent to BinAstPhotSurvey conference

· Cloud ended the session at around 15:00UT but the data was not very good with very low SNR (probably a thin vail of cloud) with the resulting plot not matching the previous 2 nights and having wild variations.

This target is now to faint for me. [2005-12-11 00:57, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced run 10:15 UT. [2005-12-10 11:23, HuntersHill]

· Full run completed at 16:45UT. Object is just a little too faint for me as I can only achieve 0.02-0.04mag precision. 2 consecutive nights show a period of 7.02 hrs +/- 0.02 hrs with an amplitude around 0.1mag

This NEO target is a PHA at mag 15.7 and a Dec of +10.

I do not believe I will be able to follow this target up tonight as the chart puts it right next to a magnitude 4 star. I'll be doing 24814 instead.

http://users.bigpond.com/higginsdj/2005JE46.htm
[2005-12-08 21:36, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started session 10:00 UT and should get a 6-7hr run if the weather holds. [2005-12-08 10:30, HuntersHill]

· Session ended 14:00 UT. Initial analysis revealed possible low amplitude object with a period <10 hrs though data was pretty noisey. Some encounters with hot pixels and background stars left some gaps in the data. [2005-12-07 21:27, HuntersHill] Message sent to BinAstPhotSurvey conference

· Starting the night with this new target before swtiching to 28887 to close the final gap. Start 10:00 UT, expected end 14:00 UT [2005-12-07 10:19, HuntersHill]

2002 RX211 (Finished) [Add new note]
· The ambiguity 5.068 vs 10.137 h in this one is unlikely to be resolved during this apparition, so we may close it now.

Petr [2006-01-03 15:05, Ondrejov]

· It is a U=2 solution; both the 5.068 and 10.137 h periods are possible, see
http://www.asu.cas.cz/~ppravec/2002rx211.png
http://www.asu.cas.cz/~ppravec/2002rx211_2.png
The longer period fits formally slightly better, but it may still be the shorter period if we allow for some systematic errors there.
A couple nights with errors <0.02 mag should nail it down. Probably best to leave it for the next lunation when it moves to the celestial equator and northern stations can help out.

Cheers, Petr [2005-11-09 13:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· Well another complete night (with thunderstorms passing 30 km north all night) and some good data. I think this one is nailed but I will leave it to Petr to call finished.

Period of 5.06893 +/- 0.00054hrs, 0.22 +/- 0.03mag Amplitude

Nothing special noted about this NEO. [2005-11-08 21:51, HuntersHill] Message sent to BinAstPhotSurvey conference

· No sooner had I started when the clouds came rolling in - maybe tommorrow. [2005-11-05 10:11, HuntersHill]

· Commenced run 12:15 UT after blanket thin cloud cleared (though it may come back) [2005-11-04 12:34, HuntersHill] Message sent to BinAstPhotSurvey conference

· Completed a 6+hr run. Data was OK. Remeasured data from 28OCT and 01NOV and although I got slightly better correlation on the data from 01NOV, the data from 28OCT only partially matches with no obvious problems other than poor conditions.

More, better quality, data is still needed. (Based on the 2 long runs matching quite well I have derived a period of 5.07hrs +/- 0.002hrs.) [2005-11-02 21:55, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced run 10:00UT. If conditions hold I should get at least 6 hrs of data. [2005-11-02 10:39, HuntersHill]

· Conditions were pretty bad. Hot, high humidity, lots of cloud, could not get the tube cooled (the outer rim of my images were heat currents) but the data I was able to use in the short 3 hour run did help to nail the period, though better coverage is required.

http://www.users.bigpond.com/higginsdj/2002RX211.htm [2005-11-01 21:43, HuntersHill] Message sent to BinAstPhotSurvey conference

· Starting a third night on this target but conditions are pretty woefull. I'll try for a full night regardless. [2005-11-01 10:19, HuntersHill]

· Hyperlinks on my 2 plots have been fixed. [2005-10-29 01:14, HuntersHill] Message sent to BinAstPhotSurvey conference

· Second night, weather still poor but got a short run in before cloud closed me down. Data indicates 2 possible solutions for primary period as shown:

http://users.bigpond.com/higginsdj/2002RX211.htm [2005-10-28 14:49, HuntersHill] Message sent to BinAstPhotSurvey conference

· Weather has been poor of late and with so many people covering 9260 AND with clouds to my north I decided to take on a new target - NEO 2002 RX211 (its at Dec 25 south).

This was my first unattended session (left the scope to it's own devices relying on the script for pointing, focusing and shutting down) I am pleased to report that I got a good 7.5 hrs worth of data. Being a work night I would normally have only got 3-4hrs worth of data.

Initial indication was no fit but with nearly 4 peaks I tried a fit on 5.08 hrs and got a good curve with the exception that one of the valleys has a distinct 'event' (a further 0.1mag dip below minimum on a curve with an amplitude of 0.25mag total).

http://users.bigpond.com/higginsdj/images/2002RX211LC.gif

Early days of course and I will get more data as the opportunities arise. [2005-10-28 03:47, HuntersHill] Message sent to BinAstPhotSurvey conference

(27136) 1998 XJ16 (Finished) [Add new note]
· Also this one is unlikely to get more (linked) data during this apparition, so we may close it now. It has P~26 h with U=2-, so, like (14835), it is marginally usable for statistical purposes. I have put it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-01-03 14:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· Data of 2005-11-13.0 by Zuzana Kanuchova and Marek Husarik from Skalnate Pleso joined in. Since they overlap with the Don Pray's data of 11-13.2, the combined data of the night that is effectively 11.5-h long rules out a period shorter than 10 h.
A longer period is not unique, though a period about 27 hours is slightly preferred (U=2-), see
http://www.asu.cas.cz/~ppravec/27136.png

If someone liked to take a few linked nights for this one, it would be useful to nail it down. Don't bother much with relative data, they wouldn't be much useful for this low-amplitude slow rotator (unless a well coordinated campaign from Europe, America and Australia is organized so that very long "nights" result. But I don't pursue it, as this target has a lower priority within the Survey now.)

Cheers, Petr [2005-11-21 10:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two nights of 2005-11-12.2 and 13.2 by Don Pray from Carbuncle Hill indicate a long-ish period, see
http://www.asu.cas.cz/~ppravec/27136.png
Marek Husarik has announced that data from Skalnate Pleso by Zuzana Kanuchova will be available soon, maybe later today.

So, no more observations are called for this one right now; we shall see what the combined Don's and Zuzana's data will reveal. If it has a period longer than 10 hours, we might be satisfied with it even if it was a U=2 result. We shall see.

Cheers, Petr [2005-11-21 09:23, Ondrejov] Message sent to BinAstPhotSurvey conference

· As a parting shot this lunation, I'll try this one on the next two nights (weather and moonlight permitting). [2005-11-11 21:18, CarbuncleHill]

(14835) Holdridge (Finished) [Add new note]
· Alan, Brian and I are working on an update of the Alan's lightcurve list. Going through the list of worked targets
here, I see that this one is unlikely to get more (linked) data during this apparition, so we may close it now. It has P>10 h with U=2-, so it is usable for statistical purposes. I have put it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2006-01-03 14:24, Ondrejov] Message sent to BinAstPhotSurvey conference

· Yes, it looks to have a period on the order of 20 h, but it is only a U=1+ or 2- result. It cannot be worked well without linkages.

Petr [2005-11-09 13:54, Ondrejov]

· I've taken three nights on this one. It's a slow rotator, so I'll put it on hold in favor of higher priority targets. [2005-11-08 21:25, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(9948) 1990 QB2 (Finished) [Add new note]
· As we have already discussed before, this one has not been worked with quality needed for the Survey, so it has not entered into the Survey's sample.

Petr [2005-12-20 15:11, Ondrejov] Message sent to BinAstPhotSurvey conference

· First three nights analysed by Peter K., David, and me. This case is a good case as a new experience how to deal with such casual targets.

Actually, the observations of this casual target do not fullfil requirements of the BinAstPhotSurvey: only about 1.5 h of coverage (by Peter from Ondrejov) has errors of 0.03 mag or lower. It is not sufficient, so this one cannot be taken as a regular target within the Survey; the asteroid with V~17 was obviously too faint to be a BinAstPhotSurvey target for David, and Peter couldn't work it well enough to get a double coverage. It will be fainter in the next lunation, so it is OK to call it done (as a non-Survey target); the solution is unique and a joint publication by Peter&David for MPB will be fine, but I don't include this one into the BinAstPhotSurvey sample (unless there are more data of good quality and coverage from Modra or Campo Catino available).

The unique solution and the Peter's data (showing the one and half hour of coverage with good errors) see
http://www.asu.cas.cz/~ppravec/9948.png
http://www.asu.cas.cz/~ppravec/9948_051109ond.png

Cheers, Petr [2005-11-12 19:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Open again tonight and getting data on this target as well as 15350. This will likely be the last night for Hunters Hill until after Full moon. [2005-11-12 11:08, HuntersHill]

· Obtained data last night (11-11-2005). Data sent to Petr. I was following 3 targets with one scope - I think 2 should be the absolute maximum......

I have derived a period of 3.526 +/- 0.001hrs 0.77 +/- 0.05 mag Amplitude (Includes Peters Data) [2005-11-11 21:01, HuntersHill] Message sent to BinAstPhotSurvey conference

· Yes, a serentipitious target with H>12 and a<2.50 AU can obviously become a BinAstPhotSurvey target as well. It doesn't matter how you chose a given target (planned or casually); the only thing that matters is if you plan to cover it according to the Survey's strategy.

Clear Skies,
Petr

PS: I was working on my new flat today. Now I'm checking new emails, and I can attend to new data that you may send by now or during next hour. [2005-11-11 16:08, Ondrejov] Message sent to BinAstPhotSurvey conference

· Peter Kusnirak of Ondrejov also got this target. I joined his data with mine to achieve a period of 3.532 +/- 0.005 hrs with an amplitude of 0.77mag.

I am taking more data of this object tonight (along with 5477 and 15350) [2005-11-11 12:50, HuntersHill] Message sent to BinAstPhotSurvey conference

· Well I would have missed this one except for doing Astrometry on 5477! 2 Targets for the price of one :-)

MPC gives this target a=2.38, h=14.5 so it fits the parameters for the survey.

One four hour session solved to 3.6 +/- 0.1 hrs, amplitude of 0.8 +/-0.1 mag (I was imaging a mag 14 target and this one is sitting at 16.5) [2005-11-11 02:55, HuntersHill] Message sent to BinAstPhotSurvey conference

(4608) 1988 BW3 (Finished) [Add new note]
· This one has been well done by Don Pray from Carbuncle Hill; four good long nights, a unique period of 13.94 h derived, no significant deviation seen, well done for the Survey. Put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Nice work, Don.

Cheers, Petr [2005-12-09 10:37, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be trying this tonight if the wind allows it.

Don [2005-12-07 22:12, CarbuncleHill]

· I'm doing a run on this tonight (12/7).

Don [2005-12-06 22:55, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Getting a first look at this. Got a late start due to clouds and wind.The 0.25m scope needs a brighter target than those in the project list. [2005-12-03 02:58, CarbuncleHill]

(28887) 2000 KQ58 (Finished) [Add new note]
· Nice work, David!
Note on it put to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-12-08 12:32, Ondrejov] Message sent to BinAstPhotSurvey conference

· Nailed shut and Finished.

Period 6.84290 +/- 0.00011hrs
Amplitude 0.51m +/- 0.01mag

No deviations or mutual events detected. [2005-12-07 21:05, HuntersHill]

· Hi David,

The gap in the repeated coverage between phase 0.9 and 1.0 may be tolerated; it is not much likely that you could miss an event there. Well, partial events may be even that short, so if you wanted to be quite sure that you didn't miss anything there and complete its coverage, it wouldn't harm as well; for such case, I am enclosing an ephemeris below. Note that if you shoot it again, you should plan for at least two hours of coverage even though the gap is shorter; the new data would need to be checked for a possible event as well, so the minimum length of coverage would be needed. It is up to you now if you wanted to invest another shorter session to it, or if you turn to another target right away. It is a very nice work in any case!

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2005-12- 6 12.174 0.950
2005-12- 6 19.017 0.950
2005-12- 7 1.860 0.950
2005-12- 7 8.703 0.950
2005-12- 7 15.546 0.950
2005-12- 7 22.389 0.950
2005-12- 8 5.232 0.950
2005-12- 8 12.075 0.950
2005-12- 8 18.918 0.950
2005-12- 9 1.761 0.950
2005-12- 9 8.604 0.950
2005-12- 9 15.447 0.950
2005-12- 9 22.290 0.950
2005-12-10 5.133 0.950
2005-12-10 11.976 0.950
2005-12-10 18.819 0.950 [2005-12-06 08:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Unattended Observing session ended just over an hour early when something (most probably cloud) caused the guiding to fail. The data almost covered the required but left a gap between phase 0.9 and 1. Period further refined to 6.8430 +/- 0.00034hr.

http://users.bigpond.com/higginsdj/28887-2000KQ58.htm [2005-12-05 21:15, HuntersHill] Message sent to BinAstPhotSurvey conference

· If conditions hold I will attempt to finish this one off tonight. Expect to start imaging 10:00UT [2005-12-05 08:32, HuntersHill]

· The 2.5 hours of observation covered the top half of the second peak and refined the period to 6.8444 +/- 0.0008hrs amplitude 0.51 +/- 0.01mag.

http://users.bigpond.com/higginsdj/28887-2000KQ58.htm [2005-11-30 21:14, HuntersHill] Message sent to BinAstPhotSurvey conference

· Closed up 12:15 UT. The clouds finally got me. [2005-11-30 12:24, HuntersHill]

· Started observing 10:00 UT (1/2 way through the second peak) between clouds! [2005-11-30 09:48, HuntersHill] Message sent to BinAstPhotSurvey conference

· Nice result, nailed down well, no significant deviations greater than a few 0.01 mag seen in the double-covered part of the curve. A last session covering the phases 0.4-1.0 (4.1-h long) that have been covered once so far will be needed to finish it for the Survey. Below I give an ephemeris for the two phases so that you can plan the one last session well.

Cheers, Petr

Date/Time UTC (LTc.) Phase
--------------------------
2005-11-28 8.835 0.400
2005-11-28 15.679 0.400
2005-11-28 22.523 0.400
2005-11-29 5.368 0.400
2005-11-29 12.212 0.400
2005-11-29 19.056 0.400
2005-11-30 1.900 0.400
2005-11-30 8.744 0.400
2005-11-30 15.589 0.400
2005-11-30 22.433 0.400
2005-12- 1 5.277 0.400
2005-12- 1 12.121 0.400
2005-12- 1 18.965 0.400
2005-12- 2 1.810 0.400
2005-12- 2 8.654 0.400
2005-12- 2 15.498 0.400
2005-12- 2 22.342 0.400
2005-12- 3 5.186 0.400
2005-12- 3 12.031 0.400
2005-12- 3 18.875 0.400
2005-12- 4 1.719 0.400
2005-12- 4 8.563 0.400
2005-12- 4 15.407 0.400
2005-12- 4 22.252 0.400
2005-12- 5 5.096 0.400
2005-12- 5 11.940 0.400
2005-12- 5 18.784 0.400

Date/Time UTC (LTc.) Phase
--------------------------
2005-11-28 12.934 0.999
2005-11-28 19.778 0.999
2005-11-29 2.622 0.999
2005-11-29 9.466 0.999
2005-11-29 16.310 0.999
2005-11-29 23.155 0.999
2005-11-30 5.999 0.999
2005-11-30 12.843 0.999
2005-11-30 19.687 0.999
2005-12- 1 2.531 0.999
2005-12- 1 9.376 0.999
2005-12- 1 16.220 0.999
2005-12- 1 23.064 0.999
2005-12- 2 5.908 0.999
2005-12- 2 12.752 0.999
2005-12- 2 19.597 0.999
2005-12- 3 2.441 0.999
2005-12- 3 9.285 0.999
2005-12- 3 16.129 0.999
2005-12- 3 22.973 0.999
2005-12- 4 5.818 0.999
2005-12- 4 12.662 0.999
2005-12- 4 19.506 0.999
2005-12- 5 2.350 0.999
2005-12- 5 9.194 0.999
2005-12- 5 16.039 0.999
2005-12- 5 22.883 0.999 [2005-11-28 09:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· Finally - a full night. This session covered just a little more than one period and might have nailed the period. No mutual events detected in the first peak....

http://users.bigpond.com/higginsdj/28887-2000KQ58.htm [2005-11-27 21:20, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started run at 10:00 UT after a full day of rain. [2005-11-27 10:45, HuntersHill]

· Analysis of data from second short night appears to have covered the second peak (no link between the peask yet) indicating the period could be as short as 7 hrs. More data required.

http://users.bigpond.com/higginsdj/28887-2000KQ58.htm [2005-11-25 23:34, HuntersHill] Message sent to BinAstPhotSurvey conference

· Ended run due to heavy cloud - 13:30UT [2005-11-25 13:35, HuntersHill]

· Commenced run at 10:00 UT [2005-11-25 11:09, HuntersHill]

· Heavy cloud building and forcast is for rain so I probably won't get to this target tonight. [2005-11-22 02:55, HuntersHill] Message sent to BinAstPhotSurvey conference

· Analysis of single 2.5 hours worth of data shows a period in the vicinity of 8 or 9 hours with an amplitude of at least 0.4mag [2005-11-21 13:14, HuntersHill]

· Ended run due to heavy cloud cover from an Easterly change 12:30UT [2005-11-21 12:58, HuntersHill] Message sent to BinAstPhotSurvey conference

· Started run on this new target 10:00 UT [2005-11-21 10:01, HuntersHill]

(13928) Aaronrogers (Finished) [Add new note]
· Since just a single night was taken and U=1+ result for this one, it doesn't come into the BinAstPhotSurvey sample. It is already too faint for us to get data needed to nail it down now, so I close it now.

Petr [2005-11-28 17:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Since just a single night was taken and U=1+ result for this one, it doesn't come into the BinAstPhotSurvey sample. It is already too faint for us to get data needed to nail it down now, so I close it now.

Petr [2005-11-28 16:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Don Pray has taken a single night of 2005-11-03.2 for this one. (It was displaced by higher priority targets then.)
The data suggest a period around 3.5 hours, but it is only a U=1+ result, see
http://www.asu.cas.cz/~ppravec/13928.png
Since it is about V=16.7 now and good data are needed for it, only stations with larger instruments are capable to work it.

Petr [2005-11-21 09:44, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll have a first look at this tonight (11/03 UT) [2005-11-02 22:48, CarbuncleHill]

(4440) Tchantches (Finished) [Add new note]
· Brian and I have received last data by Yura Krugly and Nelya Gaftonyuk. A unique period derived, a few deviations in some datasets taken crowded star fields not explained, but they don't provide an indication of binarity. The asteroid has been finished and we close the campaign.

Petr [2005-11-23 14:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· (4440) Tchantches was observed Nov 8 about 4.5h
(23-03:30 UT). [2005-11-10 12:22, Simeiz]

· (4440) Tchantches was observed Nov 8 about 4.5h
(23-03:30 UT). [2005-11-10 01:20, Simeiz] Message sent to BinAstPhotSurvey conference

· Started this about 01:30 UT, Nov. 2. It looks like it might be clear enough of stars for a large part of the night. [2005-11-02 01:51, PalmerDivide]

· One more time! Starting on this at about 01:30 UT, Oct. 27. [2005-10-27 01:03, PalmerDivide] Message sent to BinAstPhotSurvey conference

· 01:30 UT, Oct. 26. I'm working this this evening. TheSky says I'll have a reasonably good shot at data as the asteroid darts among the stars. [2005-10-26 01:28, PalmerDivide]

· This has been worked by PDO and others several nights. There are inidications of it being binary but more data is need. The primary period is about 2.78h.

The asteroid is in somewhat crowded fields, so please be careful to include only data that is <0.03m precision - look out for faint field stars!

Coverage of 4-5h minimum would be preferred with coordinated efforts among those at well-separated longitudes being particularly helpful.

Please send me data as well so that I can maintain a combined set here. Thanks!

Brian [2005-10-24 12:51, PalmerDivide] Message sent to BinAstPhotSurvey conference

(65784) 1995 UF4 (Finished) [Add new note]
· This one is about V=17.3 and fading now so we will not be able to nail down its U=2 solution of P=6.59 h obtained by Walt, John and Dirk in September from SRO in this apparition. I am closing it now, put the result to the prepublication web page
http://www.asu.cas.cz/~ppravec/newres.htm

Since we need unique solution (U=3) for asteroids with periods shorter than 10 hours so that to be able to use them well for studies within the BinAstPhotSurvey, this one doesn't qualify to be included into the BinAstPhotSurvey data sample. Well, generally, we have to pay an attention to nail down such cases as much as possible, to remove the bias there as much as possible.

Petr [2005-11-21 16:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· Walt, John, Dirk, and all,
Your four nights data from 2005-09-11.3 to 14.4 provided a U=2 solution of 6.59 hr, see
http://www.asu.cas.cz/~ppravec/65784.png
Period half that (3.295 hr) is possible as well. (A few longer periods don't fit very well, their likelihood is remote.) It will be needed to nail the solution down with high accuracy data in the next lunation. Your data have rms. residuals about 0.018 mag, so data with errors about 0.01 mag or better will be needed. The asteroid will be of similar brightness in the next lunation as it is now (V~15.6), so a larger instrument than yours will be probably needed. One full night (at least 6 hours coverage) might suffice, but we will see. So, if someone able to work it with the accuracy <=0.01 mag can take a full night for it in the next lunation, do it.

Cheers, Petr [2005-09-17 11:49, Ondrejov] Message sent to BinAstPhotSurvey conference

· Walt, John, Dirk at SRO,
Yes, your two nights for this one suggest a period of ~7 hours. (I am getting a good fit also for 6.5 hr, but other periods are possible as well, especially if it was multimodal or more complex.) A couple additional nights will probably nail it down.

Cheers, Petr [2005-09-13 08:13, Ondrejov] Message sent to BinAstPhotSurvey conference

· We got a second night on 1995 UF4 at SRO. Possible period of about 7.5 hours with amplitude about 0.1 mags. Data is noisy so period may not be correct. Nothing unusual seen in shape of curve so far. Will work for a couple of additional nights.

-Walt [2005-09-12 22:39, Sonoita] Message sent to BinAstPhotSurvey conference

· First night of 4 1/2 hours duration. Amplitude less than 0.1 magnitudes. Will work again tonight from SRO. [2005-09-11 21:52, Sonoita]

· We'll be running this asteroid from Sonoita beginning tonight. The weather looks to be improving considerably. [2005-09-11 03:44, Sonoita] Message sent to BinAstPhotSurvey conference

(12331) 1992 UH6 (Finished) [Add new note]
· This one is very unlikely to be followed by someone with a high accuracy needed to improve its solution now. Since it is just a U=1 solution, it is not sufficient for the BinAstPhotSurvey, so we don't include this one into the Survey's data sample. I close it here now. The result have been already put into a paper by David Higgins et al. for MPB, so it will be published there.

Petr [2005-11-21 15:57, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hi David,

Yes, your data reveal a very low amplitude variation on each of the four nights. In fact, your data are of fairly good accuracy (errors 0.01-0.02 mag for most of your points from the three recent nights), but the amplitude seen on each of the nights is only 0.02 mag! So, very accurate data would be needed to solve this case. Unless there is someone with a larger telescope able to work the southern target with errors not greater than 0.005 mag, we must give up this one. (Sure, I don't like us giving up targets, as that causes a bias in our statistics which cannot be reasonably modeled, but in a case like this, we have no choice at the time being. A suggestion on strategy with further targets: it would be good if you targeted preferably objects north of Dec of -10 deg, as such objects might be easily followed up by others here with larger telescopes in cases you cannot solve well yourself.)

To conclude, unless there turns out to be someone able to work (12331) with a 1-m class southern telescope for at least one full night, publish the data you already have, though it is only a U=1 result.

Petr [2005-09-05 15:52, Ondrejov]

(3854) George (Finished) [Add new note]
· Brian Warner wrote to the list:
Pending Petr's review, I'm going to close the book on these two asteroids. There
appears to be nothing unusual with 4440 that can be confirmed. The possibility
that 3854 is a binary remains but lacks sufficient confirmation. With 3854
rapidly fading and the ability to get 0.02m or better, even for the larger scopes
in the group, it's time to put it aside and work on other targets.

Yes, we can close the campaign on 3854 now. Deviations seen there on a few nights have not been resolved satisfactorily with further data from Palmer Divide Observatory and Modra; no period that would explain them found.

Petr [2005-11-20 16:14, Ondrejov] Message sent to BinAstPhotSurvey conference

· Struggling again with bad and changing conditions but synodic period seems to be unique (3.34 h, amplitude 0.14 mag).

Adrian [2005-11-17 23:55, Modra]

· Started on this about 02:00 UT, Nov. 4. [2005-11-04 02:33, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Started this about 01:30, Nov. 2. [2005-11-02 01:52, PalmerDivide]

(14257) 2000 AR97 (Finished) [Add new note]
· This one has been done well by Don Pray from Carbuncle Hill; slow-ish rotator (P=13.58 h), nice unique solution. Finished for the Survey. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-11-04 09:26, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll attempt a first look at this tonight.

Don [2005-10-20 21:48, CarbuncleHill]

(7760) 1990 RW3 (Finished) [Add new note]
· Don Pray, Adrian Galad et al., and Marek Husarik have done this slow rotator (P=25.90 h) well. It is finished for the Survey. A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-11-02 15:40, Ondrejov] Message sent to BinAstPhotSurvey conference

· Started the run on this object at 19.20 UT
Marek [2005-10-30 19:54, Skalnate Pleso]

· I'll try a run on this tonight.

Don [2005-10-20 21:39, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· My latest three nights data of very short duration added to Don's data indicate P of about 25.8 h. The amplitude unknown - perhaps about 0.3 - 0.4 mag. Still uncertain and observations (preferably linked)are welcomed.
Adrian [2005-10-10 00:52, Modra] Message sent to BinAstPhotSurvey conference

· The first night's data show a slow rotator. Help with this one would be appreciated, particularly from sites distant from 71 west longitude.

Don [2005-10-02 19:57, CarbuncleHill]

· I'm starting this one tonight (Oct 2 UT).

Don [2005-10-01 22:07, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(4674) Pauling (Finished) [Add new note]
· Another run on Oct. 24 UT shows no repeat of the extinction seen once by PDO and maybe by Carbuncle Hill. Additional work would not be efficient use of time.

This asteroid is now complete. Period 2.5307 +/- 0.0001h. Good work and thanks to all who took part.

Brian [2005-10-24 12:45, PalmerDivide] Message sent to BinAstPhotSurvey conference

· I've started this at 12:00 AM UT.

Don [2005-10-22 01:06, CarbuncleHill]

· I will attempt a run on this tonight if weather cooperates.

Don [2005-10-20 21:34, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Hi Brian,

Great info!
Could you send us a link or image for your lightcurve(s)?

Marek [2005-10-19 07:36, Skalnate Pleso]

· More data is needed on this asteroid. It's a known binary
but one session from PDO indicates the possibility of a _third_ body in the system, i.e., a satellite closer to the parent body than the one found with AO observations.

Efforts on this need to be coordinated to provide the
best chance of success. The primary period has been well
established, so it is not required to get data with
significant overlap, i.e., from stations similar in
longitude.

1. Long sessions, at least 4-5 hours and more, are needed.
Short sessions will have a small chance of providing
the needed data.

2. Precision of <0.03m is required. The target is about
15.4 and fading to 15.6 for the next 10 days.

3. Data from stations well separated in longitude from the
same day would be best so as to create a nearly
continuous session.

I'll be working this every clear night once the moon is
out of the way. However, clouds may have me socked in and I'll be glad for some help - so please check with me if you have some free time. If I'm clear, you'll be able to keep working your other targets or some of the other pending targets in Petr's list. Something similar would be good among those in Europe (sorry Down Under folks, it's at +23 and so probably a bit low).

Thanks for everyone's help. If this pans out, it would be
quite a find for the group.

Clear Skies,
Brian [2005-10-18 20:44, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Starting a run at 02:30 UT, Oct. 14. [2005-10-14 01:26, PalmerDivide]

· I'm making a run on this (2005 Oct. 13 UT). I should get about 5h of data, if the weather holds. [2005-10-13 07:19, PalmerDivide] Message sent to BinAstPhotSurvey conference

· I did ~1.5 h run tonight but interupted by background stars. My data are linked and calibrated (but not processed yet), so your tonight's observations, Marian, will be useful. Especially if there will be some overlap in your and our data. Peter [2005-10-10 20:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observing this one tonight at Skalnate Pleso...

Marian [2005-10-10 19:36, Skalnate Pleso]

· Combined observations from Palmer Divide, Ondrejov, and Modra, give a primary period of 2.5310 +/- 0.0007h and amplitude of about 0.05m.

Additional observations may be needed. Petr can say more after he returns from the weekend. [2005-10-09 16:48, PalmerDivide] Message sent to BinAstPhotSurvey conference

· Observing this tonight. Poor seeing but most data should still be usable. [2005-10-08 05:47, PalmerDivide]

· There are clouds around, but this is quite high in declination so I stay on it this night. Some parts of the lightcurve will probably be useful.

Adrian [2005-10-07 00:23, Modra] Message sent to BinAstPhotSurvey conference

· This is a known binary. However its period had not been determined. After two nights, I had conflicting results. Here's Petr's interpretation:

Since it is a distant binary (Ds/Dp estimated about 0.3 from the AO observations, but with Porb on the order of 2000 hours), you may actually see a rotation of the secondary superimposed to the rotation of the primary. (The econdary cannot be synchronized with the orbital motion at so large distance between the components.) So, it will be needed to cover its lightcurve well so that we could separate the two components. It may be a case similar to Kastel, 2002 XD58, and 6611.

So, if you have an opportunity to get at least 3 hours of good data, <= 0.02m, please do so and send it directly to me. I will merge the data into a single set and then work with Petr in trying to find solutions for the system.

Thanks in advance for any help!

Brian D. Warner
Palmer Divide Observatory [2005-10-04 16:48, PalmerDivide] Message sent to BinAstPhotSurvey conference

(13906) Shunda (Finished) [Add new note]
· This one has been done well by Don Pray from Carbuncle hill, secure solution, multiple coverage, no deviation see; finished for the Survey. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-10-19 14:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· Seems to have a period <3h. I'll be doing it again tonight.

Don [2005-10-01 22:05, CarbuncleHill]

· I'll be starting this tonight. Clear weather continues.

Don [2005-10-01 00:36, CarbuncleHill] Message sent to BinAstPhotSurvey conference

(16403) 1984 WJ1 (Finished) [Add new note]
· Though I have formally closed the campaign on this one yesterday, later on I investigated further why there remained the ambiguity 7.54 vs 11.31 h; the curve was relatively symmetric, but not quite (one maximum of noticeably lower height), and the accurate full night observations that Peter was taking here during the past fwe nights should in principle allow to resolve the ambiguity. I have found that the ambiguity remained there because of a particular kind of "interference" between the 11.31 h period and the ~7.7-h long coverage that Peter was able to take on each of the nights. I have found that the "interference" would be broken on the past night, so I suggested to Peter to follow up this object on the one more night. He has got good data, and the ambiguity has been resolved; the data fit well with the period of 7.54 h, but not with the period 11.31 h. I have updated it on the results summary page linked on
http://www.asu.cas.cz/~ppravec/newres.htm

It is always good to get a unique solution. One additional well-planned night can bring critical data for resolving an ambiguity, as demonstrated by this case.

Cheers, Petr [2005-10-13 08:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· Four linked nights 2005-10-09.0 to 12.0 by Peter K. here have helped a lot to resolve this case. Don has revisited one unfitting session and found an observational problem there; re-measured data of the session fit well with the other data now. This case has therefore been resolved as not showing any sign of binarity. The ambiguity of 7.54 h vs 11.31 h has not been resolved formally; due to the high degree of symmetry of the lightcurve, both periods are formally possible, but the longer period is considered implausible as it would have prominent signal in the 3rd harmonic only; we adopt the period of 7.54 h and assign it U=3- In any case, the period has been covered multiple times, so the target is finished for the Survey. I put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-10-12 11:59, Ondrejov] Message sent to BinAstPhotSurvey conference

· I just started my 4th night devoted to (16403), our main target in these days. I should be able to get ~7.5 h of linked/calibrated observations if weather holds. There are very well sky conditions outside, at this moment. [2005-10-10 20:15, Ondrejov] Message sent to BinAstPhotSurvey conference

· Observed again for 7.6 h. Some cirrus in the evening but data looks good. Peter [2005-10-09 05:46, Ondrejov]

· Observed for 7.4 h last night. There was some cirrus in the sky and a bright star near the target. But it should be usable, I hope.

Peter [2005-10-08 05:33, Ondrejov] Message sent to BinAstPhotSurvey conference

· Two new sessions joined in:
2005-10-02.0 by Stefan Gajdos and Jozo Vilagi from Modra
2005-10-02.2 by Don Pray from Carbuncle Hill

The solution is still not entirely unique, though a period of 7.53 h appears plausible, see
http://www.asu.cas.cz/~ppravec/16403.png
Moreover, there are present the unexplained prominent deviations in some of the Don's nights. They appear to be real indeed, so we need to resolve this case with thorough coverage (long sessions). Unfortunately, both Don Pray as well as we at Ondrejov are out during these nights, so we cannot follow up this one now. I encourage you at other stations to help us and to observe this one thoroughly during these nights; there really appears to be something interesting in the asteroid.

Clear Skies!
Petr [2005-10-04 15:53, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be doing this again tonight.

Don [2005-10-01 21:42, CarbuncleHill]

· New session by Don of 2005-10-01.2 joined in. This case is still unclear, the best fit solution assuming a bimodal shape see
http://www.asu.cas.cz/~ppravec/16403.png
Some data don't fit well, deviations are up to 0.06 mag. So, thorough monitoring of this case (long sessions) from a few stations spread over in longitude is needed to reveal what is indeed there in the asteroid.

Clear Skies, Petr [2005-10-01 18:04, Ondrejov] Message sent to BinAstPhotSurvey conference

· New session 2005-09-30.3 by Don from Carbuncle Hill joined in. The trimodal lightcurve solution with P=11.3 h fits most data except a block of eight points around phase 0.7 in picture
http://www.asu.cas.cz/~ppravec/16403.png
Last four of the eight points have large errors (Don reported haze there) but the first four points should be good, and the general downward trend seems real, as Don's noted. So, this one is turning more and more interesting with additional data.
Of course, more data are needed.

Clear Skies, Petr [2005-09-30 16:55, Ondrejov] Message sent to BinAstPhotSurvey conference

· The session by Bob Koff of 2005-09-27.4 joined in. The possible solution with trimodal lightcurve and P~11.3 h suggested by Don still fits, see
http://www.asu.cas.cz/~ppravec/16403.png
but nothing firm yet. More observations (long sessions) needed to find whether the trimodal solution is real, or whether it is something else ....

Clear Skies, Petr [2005-09-30 15:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have a short session from 9/27, where I observed for about two hours. I will send the data to Petr.

Bob Koff
Antelope Hills Observatory [2005-09-30 14:09, AntelopeHills]

· This is a quick info that a short session (1.3 h) by Peter K. from here of 2005-09-30.0 is consistent with a trimodal curve with P~11.3 h, but obviously doesn't nail it down. (It will be useful especially after linkage/calibrations.)

Clear Skies, Petr Pravec [2005-09-30 10:54, Ondrejov] Message sent to BinAstPhotSurvey conference

· After two session on this, the lightcurve looks like it could be somewhat complex, possibly trimodal with P~11.3h.

Assistance from other stations is requested, the further removed from 71 deg. west longitude, the better. Thanks.

Don [2005-09-29 21:42, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Started this on 9/28ut.

Don [2005-09-29 04:38, CarbuncleHill]

1998 ST49 (Finished) [Add new note]
· This one has been well done by Adrian Galad from Modra. A unique period of 2.301 h (error <0.001 h), multiple coverage, no significant deviation from the strict periodicity; finished for the BinAstPhotSurvey. We have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-10-10 17:45, Ondrejov] Message sent to BinAstPhotSurvey conference

· Very tough target - projected to the galactic equator. Three nights data indicate P 2.3 h and A 0.12 mag. But hard to find any possible attenuations.
Adrian [2005-10-10 00:57, Modra]

(1906) Naef (Finished) [Add new note]
· This one has been well done by Russ Durkee from Shed of Science Observatory: a unique solution with period of 11.009 h (error <0.001 h). A note on it added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-10-10 15:12, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed the third night of (1906) Naef. Looks like an 11 hr period ~.8 mag amplitude. Lightcurve looks essentially complete.

Regards,

Russ Durkee [2005-10-09 16:46, Shed of Science]

2002 XD58 (Finished) [Add new note]
· The three nights of 2005-10-01.2 to 03.1 by Shannon and Zbig from Elginfield Observatory show the same two-periodic behavior as during 2005-08-25 to 09-08, but no mutual event revealed, so the status of this asteroid remains a probable but not certain binary. The periods have been refined to
P1 = 2.96488 hr (error <0.0001 hr)
P2 = 7.9539 hr (error <0.001 hr)
The new UWO data see
http://www.asu.cas.cz/~ppravec/2002xd58_oct_all.png
http://www.asu.cas.cz/~ppravec/2002xd58_oct_shortpc.png
http://www.asu.cas.cz/~ppravec/2002xd58_oct_longpc.png
The shapes of both components are similar to those seen during 08-25 to 09-08, their amplitudes changed little or not, respectively; now they are
Ampl1 = 0.18 mag
Ampl2 = 0.08 mag

This probable binary is finished within the Survey. It will be good to publish it together with other similar cases of probable binaries, namely 3982 Kastel (unless it develops mutual events when we re-target it in the next lunation so that it would become a certain binary detection) and 6611 (observed earlier in this year).

Great work all!

Cheers,
Petr Pravec [2005-10-05 06:29, Ondrejov] Message sent to BinAstPhotSurvey conference

· I have been working on this target for the past two nights and hopefully Zbig will get another full 8 hours tomorrow night.
Shannon [2005-10-02 06:48, Elginfield]

· Double coverage of its long period (7.95 h) with errors <0.03 mag is needed to monitor a potential development of mutual events in this probable binary.

Cheers, Petr [2005-09-30 14:35, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined into the solution:
2005-09-06.3 by Shannon/Zbig from Elginfield
2005-09-07.2 and 08.2 by Don from Carbuncle Hill
2005-09-08.0 by Peter K. from here
as well as updated data from Modra (rereduced by Adrian Galad) of
2005-09-03.0.

The solution is stable:
P1 = 2.9650 +/- 0.0002 hr
P2 = 7.954 +/- 0.002 hr
Ampl1 = 0.14 mag
Ampl2 = 0.09 mag
See
http://www.asu.cas.cz/~ppravec/2002xd58_all.png
http://www.asu.cas.cz/~ppravec/2002xd58_shortpc.png
http://www.asu.cas.cz/~ppravec/2002xd58_longpc.png

So, the new data have confirmed the solution well. The additive two-periodic character of the asteroid is interpreted as rotational lightcurves of two bodies in binary system. We have not seen any deviation that would prominently indicate a mutual event. (There is one deviation on a beginning of one night pending to be checked, but we think that it is just an observational artifact at this moment.) So, this is a probable binary, but not a certain (regular) detection. Anyway, we can consider it finished for this lunation. In the next lunation we may re-target it again to see whether its geometry doesn't change and mutual events don't begin to occur ---it will be easy to plan such follow up observations since we know its periods now--- but for this lunation, it is finished.

Great work all! We will consider how to publish this and other such probable but non-regular binary detections.

Cheers, Petr Pravec [2005-09-08 16:38, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined into the solution:
2005-09-06.2 by Don Pray from Carbuncle Hill
2005-09-07.0 by Peter Kusnirak from here
2005-09-07.3 by Zbyszek Krzeminski from Elginfield
as well as updated data from Modra (rereduced by Adrian Galad) of
2005-09-02.0.

The solution has stabilized: The short period is entirely unique: 2.9647 +/- 0.0002 hr. (No alias is possible as we see lightcurve features there repeating exactly with the short period above.) The long period has been finally nailed down with the additional data: 7.952 +/- 0.002 hr. (Fyi on what was the problem that didn't allow me to resolve the long period well with the less abundant data before: For this 7.95-h period, there are 6 maxima/minima per ~1 day; the lightcurve is dominated with its 2nd harmonic. The earlier data suggested that solutions with either 5 maxima per ~1 day (~9.3 h) or 7 maxima per ~1 day (6.8 hr period) are also possible. Now, with the higher quality and more abundant data, the ambiguity has been resolved and it is clear now that there actually are 6 maxima of the long period per ~1 day; i.e., the long period is 7.95 hr.

The solution see
http://www.asu.cas.cz/~ppravec/2002xd58_all.png
http://www.asu.cas.cz/~ppravec/2002xd58_shortpc.png
http://www.asu.cas.cz/~ppravec/2002xd58_longpc.png
You may be also interested to see how the model fits with
the last night's data by Zbig from Elginfield:
http://www.asu.cas.cz/~ppravec/2002xd58_050907_uwo.png

Well, now when we have the two periods nailed down, we can begin to interpret the data. Since no mutual events have been detected, our interpretation of the two-period additive lightcurve as being rotational lightcurves of two bodies in a binary system is probable, but not certain. We will therefore publish it as a probable binary, but not a certain (regular) detection. And, of course, we cannot derive its orbital period with no events seen.

So, what further observations would be useful for this one?
The golden rule for complex cases like this one is to take one more night than strictly necessary to obtain a unique solution, to increase stability of the solution (by having some additional redundancy in the dataset). So, Zbig/Shannon, a 2nd night from your station would be useful to confirm the solution, if you still have very good sky conditions. For the same rule, Peter K. should observe it from here tonight as well (again, only if there are again such very good conditions allowing a full night session with good accuracy). Those two nights from our two stations should be the last ones that we need to confirm the solution. Unless they reveal something unexpected, we will close the campaign on this probable binary after them.

Cheers, Petr Pravec [2005-09-07 13:27, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data joined to the solution:
2005-09-05.0 and 05.9 by Peter K. here
2005-09-05.2 by Don from Carbuncle Hill.
The data still require a second period to be fitted, see current solution:
http://www.asu.cas.cz/~ppravec/2002xd58_all.png
http://www.asu.cas.cz/~ppravec/2002xd58_shortpc.png
http://www.asu.cas.cz/~ppravec/2002xd58_longpc.png
The two periods are 2.964 and 6.79 hr. (The longer period of 9.29 hr suggested by the earlier analysis, see below, appears to be just an alias according to the analysis of the new dataset. Btw, the possible "event" mentioned in my previous message, see below, has been absorbed into the new solution well.) The solution is still not very good, more data (long sessions, errors <0.03 mag) are needed. I don't speculate what the second period is until we establish it well.

Cheers, Petr [2005-09-06 14:28, Ondrejov] Message sent to BinAstPhotSurvey conference

· New data by Don of 2005-09-03.2 and 04.2 added. The solution is still not quite certain, though I am getting the best fit with the same two periods as mentioned below.

If, and here is big IF, the solution is correct, than the deconvolved data show an attenuation event ~0.16 mag deep in the last night, see
http://www.asu.cas.cz/~ppravec/2002xd58_longpc.png
http://www.asu.cas.cz/~ppravec/2002xd58_shortpc.png
We need more data of good quality to
1) confirm the solution is correct
2) detect further attenuation events.

So, if you can take long sessions with errors <0.03 mag for this one, do it.

Cheers, Petr [2005-09-05 15:46, Ondrejov]

(5580) Sharidake (Finished) [Add new note]
· This is an info that Don Pray, with assistance from Skalnate Pleso, Ondrejov and Modra, has finished (5580) Sharidake. Well done for the Survey, unique period of 14.59 hr derived, no deviation seen. I have added it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Well done, folks!

Cheers, Petr Pravec [2005-10-02 16:05, Ondrejov] Message sent to BinAstPhotSurvey conference

· Only short run (3hours), stopped by clouds at 23:10 UT.
Continuous decrease by 0.35mag. [2005-10-02 04:30, Modra]

· I'll be doing a run on this tonight, although clouds may eventually shut me down. [2005-09-28 22:24, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Skalnate Pleso is in the clouds. This night is out. [2005-09-28 20:50, Skalnate Pleso]

· Wednesday and Thursday night have uncertain forecasts for Rhode Island, but I also plan to do runs on 5580 if possible. [2005-09-28 15:52, CarbuncleHill] Message sent to BinAstPhotSurvey conference

· Weather forecast is not very optimistic for aour location Skalnate Pleso. High probability of the clear skies is till to midnight (Wed to Thu). So I'll try run anyway. [2005-09-28 09:32, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· This is basicly to let Don know that Marek Husarik from Skalnate Pleso took 2.7-h long data which showed a continuous decrease by 0.3 mag. So, this one looks to have a period >10 h. Don and Marek, please collaborate on this one together so that to derive its period well. (Btw, with its long-ish period, it may be even alternated with another target, if your system allows that ....)

Clear Skies, Petr [2005-09-28 09:09, Ondrejov] Message sent to BinAstPhotSurvey conference

· I'll be doing a run on 5580 tonight. [2005-09-27 23:31, CarbuncleHill]

· I'm starting 5580 Sharidake session. The sky is not clear here. [2005-09-27 22:04, Skalnate Pleso] Message sent to BinAstPhotSurvey conference

· I'm starting 5580 tonight. [2005-09-25 01:20, CarbuncleHill]

6556 (Finished) [Add new note]
· Third night and nailed it. Bimodal it is.

Tonight was also my first use of MPO_Connections (as opposed to ACP4 and MaxIm DL) to run the scope control and image capture. Hey it may be coincidence but the data is so much better than the other nights and last night I had to contend with the wind!

http://users.bigpond.com/higginsdj/6556Arcimboldo.htm

Petr, I'll email you my data (as soon as I can locate the email about the data format you want) [2005-10-02 04:21, HuntersHill] Message sent to BinAstPhotSurvey conference

· David,

The bimodal solution seems likely, but yes, as Brian has noted and you plan, at least one more night on it is in order. The most important for this one now is to take a night soon after a previous one; with the 7-day gap you have got between your two nights for this one so far, the solution cannot be unique. Take at least two consecutive nights. (If you observe it tonight, it would be that.) If you couldn't take two consecutive nights by yourself, ask someone else for assistance. (A longitudinal difference would actually further help to resolve the ambiguities.)

Cheers, Petr [2005-10-01 07:51, Ondrejov] Message sent to BinAstPhotSurvey conference

· Completed my second run (5 hours) and now have 4 possible fits:
2.5157 +- 0.0003hrs 0.25 +- 0.02m Bimodal
3.8020 +- 0.0001hrs 0.25 +- 0.02m 3 peaks
4.9573 +- 0.0005hrs 0.25 +- 0.02m 4 peaks
5.1070 +- 0.0007hrs 0.25 +- 0.02m 4 peaks

They are all good fits and other than the number of peaks I see nothing unusual about this one. 3.8020 hrs appears to be the best fit (and was Canopus' best fit choice) but I will try to get at least one more night on it.

Plots can be seen here:
http://users.bigpond.com/higginsdj/6556Arcimboldo.htm [2005-10-01 02:38, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commencing my second run on 6556. Conditions are not great but I should get around 5 hours of data. [2005-09-30 15:20, HuntersHill]

· Initial run of 6.5 hours indicates a period of approximately 3.8 hours. Data was not perfect (I was experimenting with new guide software so 1/5th of the images were trailed).

There may be something interesting in this one but it is way too early to tell.

http://users.bigpond.com/higginsdj/6556Arcimboldo.htm [2005-09-24 02:37, HuntersHill] Message sent to BinAstPhotSurvey conference

· Commenced a run on this target at E14 Hunters Hill. With luck this first run should be 6-7 hours. [2005-09-23 16:02, HuntersHill]

(2139) Makharadze (Finished) [Add new note]
· Another very nice collaboration between Don Pray from Carbuncle Hill and Adrian Galad and Leos Kornos from Modra. This one is well done for the Survey, the period solution is unique, no significant deviation seen. I have put a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Great work, Don, Adrian and Leos!

Cheers, Petr [2005-09-25 17:47, Ondrejov] Message sent to BinAstPhotSurvey conference

· Seems to be finished, though some parts of the lightcurve were observed through clouds.

Adrian [2005-09-24 09:17, Modra]

· Yesterday was my first night with telscope after two month of holidays and conference in ACM. As I see my name here the night was devoted at least partly to 2139. I would like to continue tonight. I could join data with Don's data.

Adrian Galad (Modra) [2005-09-08 09:21, Modra] Message sent to BinAstPhotSurvey conference

· The target is V<15 and at Dec~+2 deg, so there will be very likely someone able and willing to help you with this one (Adrian at Modra and/or David Higgings come to mind first). Folks, if you cannot work 2002 XD58 well and don't have any other target worked out, help Don to cover the ~12-h object. One or two nights from your station may suffice to nail the solution down. (With the 12-h period, it may be even alternated with another target, if your system allows that.)

Petr

> Group,
>
> I'm currently observing 2139 Makharadze, which meets the criteria for
> the survey, in this case a = 2.46, H = 12.8. After two nights, it
> looks like its period is very close to 12 h. With that period, a
> single station will take a long time to complete it. I'm at 71d, 46m,
> so if anyone at a significantly different longitude can help, it would
> be appreciated.
>
> Don Pray
> Carbuncle Hill Observatory [2005-09-05 15:35, Ondrejov]

51773 (Finished) [Add new note]
· Additional data of the past night by Don have finalized the dataset for this one. The solution is unique, there are some small deviations on a level of a few hundredths mag, but no indication of a binarity. We may consider this one finished for the Survey. I have added it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Very nice work, Adrian and Don!

Cheers, Petr [2005-09-24 20:41, Ondrejov] Message sent to BinAstPhotSurvey conference

· Adrian and Don,
Very good data and solution; I'm getting 3.9975 +/-0.0002 h with your dataset. The data fit reasonably well with the single periodicity, deviations are small. Ok, we wait for your final data before concluding this one.

Nice work!

Cheers, Petr [2005-09-24 18:16, Ondrejov] Message sent to BinAstPhotSurvey conference

· According to Don's and Modra data it seems 3.9991 h is the possible solution for P. A is about 0.19 mag. Only there are several points that are scattered much higher and lower from the expected values so I probably have to processed those parts again.

Adrian [2005-09-24 09:15, Modra] Message sent to BinAstPhotSurvey conference

· I'll try to get a few hours on this tonight. [2005-09-23 02:58, CarbuncleHill]

· Two nights of short duration and of changing conditions in the end of July and 3 more nights in September from Modra show no clear solution for P, nor for the amplitude. Two consecutive nights of good quality are recomended to solve it. It is a good target for us when weather co-operates :-)
0.02 mag accuracy or better is welcomed.
Adrian [2005-09-21 20:46, Modra] Message sent to BinAstPhotSurvey conference

(24643) MacCready (Finished) [Add new note]
· I'm preparing a list of targets for the upcoming lunation. One of the objects worked in the past lunation, (24643) MacCready, is not well observable now, we have to close it though it hasn't been finished well for the BinAstPhotSurvey. Specifically, its period estimate of 4.5 hr derived from August observations by Shannon Nudds from Elginfield (roughly consistent with a slightly noisier July data by Ron and Vishnu from Badlands) hasn't been nailed down well enough, it is U=2 result. (In the past lunation, they were quite busy with the binary 76818 as well as the probable binary 2002 XD58, so they couldn't finish it.) I have added a note on it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2005-09-19 12:59, Ondrejov] Message sent to BinAstPhotSurvey conference

(28017) 1997 YV13 (Finished) [Add new note]
· This is an info that this one has been finished. Calibrated/linked observations by Peter Kusnirak from Ondrejov and by Bob Koff from Antelope Hills have revealed that it has a long period on an order of 40 hours but it doesn't fit well with any single period, and it likely is a tumbler. We will finish its analysis after completing calibrations here from Ondrejov. Anyway, we have closed the campaign on this one now, note added to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Petr [2005-09-14 08:56, Ondrejov] Message sent to BinAstPhotSurvey conference

· Hello Bob,

Very good you worked this one, as it appears to be a long period object from new observations by Peter K. here (3 nights between 2005-08-27.0 to 30.0). They are mutually linked, a tentative solution of 36 hr (may be quite off) see
http://www.asu.cas.cz/~ppravec/28017.png
(Absolute calibrations of the R data will processed later.)

Your linked data taken from the different longitude will contribute to the solution likely in a critical way. I suggest both you and Peter here continues to observe the target for a few more nights until the solution is well established.

Petr

PS: Ron and Vishnu, your data are consistent with long period, but since they are relative, they couldn't reveal it as the amplitude is low. Calibrated or linked data are needed. [2005-09-05 15:54, Ondrejov]

(66251) 1992 GJ2 (Finished) [Add new note]
· This ~1-km sized Amor asteroid has been finished. The data of four nights from Modra and one night from Badlands reveal a unique period 2.4621 +/- 0.0002 hr, no deviation seen, so this one is well done for our Survey. I have added it to
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm

Cheers, Petr [2005-09-13 06:50, Ondrejov] Message sent to BinAstPhotSurvey conference

· This is just to confirm the Adrian's analysis: The period of 2.462 hr and amplitude of 0.13 mag is unique, no significant deviation seen in the four nights data from Modra. We wait with stating this asteroid as finished after Vishnu&Ron finish their data/observations. Cheers, Petr [2005-09-10 17:00, Ondrejov] Message sent to BinAstPhotSurvey conference

· Letting the group know that we just started another run tonight. Hope to get in 3-4 hours before clouds roll in. Plan also to get one more full session of 6-7 hours tomorrow night. [2005-09-10 04:13, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· This target seems to be done or very close to it - using 4 nights from Modra and 2 from Badlands. The rotational period seems to be short - about 2.46 h, while the lightcurve amplitude is 0.14 mag.

Adrian [2005-09-09 21:55, Modra] Message sent to BinAstPhotSurvey conference

· Just want to let everyone know that Ron and I have completed a second night on the object and we will be doing one last night tonight (weather permitting).
Vishnu [2005-09-08 14:18, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

· 66251 was also done in Modra by my colleagues. Data need to be processed. I hope it could be done this week and joined with Badland's data.

Adrian [2005-09-08 09:25, Modra]

· Hello Everyone

Just want to let you know that Ron and I will be working on this object for this lunation (at least 3 nights, weather permitting). The first night of observations is currently under way (Sept.6-7 UT).
clear skies
Vishnu [2005-09-07 06:50, Vishnu Reddy/Tucson] Message sent to BinAstPhotSurvey conference

(5386) 1975 TH6 (Finished) [Add new note]
· Done by David Higgins and Gianluca Masi.

The inner MB asteroid (5386) 1975 TH6 has been finished by David Higgins from Hunters Hill (6 nights) and by Gianluca Masi from Chile (1 night; Gianluca, any details on the station to be mentioned on
http://www.asu.cas.cz/~asteroid/observ.htm ?)
I have linked its data summary on
http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm
The period is uniquely derived, no deviation seen, the
asteroid is well done and finished for the BinAstPhotSurvey.

Very good work, David and Gianluca!

Cheers,

Petr [2005-09-05 15:09, Ondrejov]

Maintained by Petr Scheirich (petr.scheirich@centrum.cz) and Peter Kusnirak. (You can mail to P.S. or to Petr Pravec - ppravec@asu.cas.cz)

(0000) Test (Finished) - Finished		[Add new note]
·	[2024-04-09 08:50, Ondrejov]

·	Test, please ignore. [2024-04-09 08:44, Ondrejov]



·	XXXX [2019-12-04 15:06, Ondrejov]

·	This is a test message only. Please ignore. Petr [2019-12-04 10:05, Ondrejov]

·	bbbb [2019-12-02 10:31, Ondrejov]

·	aaaa [2019-12-02 09:54, Ondrejov]

·	XXXXXX [2019-11-08 09:00, Ondrejov]

·	Test - please ignore. [2019-11-04 10:19, Ondrejov]

(20325) Julianoey (Finished) - binary		[Add new note]
·	This one is closed for that apparition. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2024-03-01 13:14, Ondrejov]



·	Julian Oey has observed "his" binary asteroid from Leura recently :) Lc decomposition: http://www.asu.cas.cz/~asteroid/20325_2021a_porb.png http://www.asu.cas.cz/~asteroid/20325_2021a_p1.png More data (error < 0.03 mag) would be useful for future modeling of the binary. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2021-11- 6 5.47 0.256 2021-11- 7 5.01 0.256 2021-11- 8 4.55 0.256 2021-11- 9 4.08 0.256 2021-11-10 3.62 0.256 2021-11-11 3.16 0.256 2021-11-12 2.70 0.256 2021-11-22 21.60 0.256 2021-11-23 21.14 0.256 2021-11-24 20.68 0.256 2021-11-25 20.21 0.256 2021-11-26 19.75 0.256 2021-11-27 19.29 0.256 2021-11-28 18.82 0.256 2021-11-29 18.36 0.256 2021-11-30 17.90 0.256 2021-12- 1 17.44 0.256 2021-12- 2 16.97 0.256 2021-12- 3 16.51 0.256 2021-12- 4 16.05 0.256 2021-12- 5 15.58 0.256 2021-12- 6 15.12 0.256 2021-12- 7 14.66 0.256 2021-12- 8 14.19 0.256 2021-12- 9 13.73 0.256 Date/Time UTC (LTc.) Phase -------------------------- 2021-11- 5 17.69 0.756 2021-11- 6 17.23 0.756 2021-11- 7 16.77 0.756 2021-11- 8 16.30 0.756 2021-11- 9 15.84 0.756 2021-11-10 15.38 0.756 2021-11-11 14.92 0.756 2021-11-12 14.45 0.756 2021-11-23 9.36 0.756 2021-11-24 8.90 0.756 2021-11-25 8.43 0.756 2021-11-26 7.97 0.756 2021-11-27 7.51 0.756 2021-11-28 7.04 0.756 2021-11-29 6.58 0.756 2021-11-30 6.12 0.756 2021-12- 1 5.66 0.756 2021-12- 2 5.19 0.756 2021-12- 3 4.73 0.756 2021-12- 4 4.27 0.756 2021-12- 5 3.80 0.756 2021-12- 6 3.34 0.756 2021-12- 7 2.88 0.756 2021-12- 8 2.41 0.756 2021-12- 9 1.95 0.756 Clear Skies, Petr [2021-11-05 11:46, Ondrejov]

·	start to observe from 13:24 to 17:48 UT 10/01 [2021-10-01 23:36, Blue Mountains Obs]



·	This binary has got insufficient data in this year to be decomposed accurately. Target closed for this apparition. Petr [2019-06-13 11:14, Ondrejov]

·	observed on 01/01, 01/03, 01/12, 01/14, 01/15, 01/16 [2019-01-17 11:03, Blue Mountains Obs]

·	Started observing the return binary [2019-01-01 21:00, Blue Mountains Obs]



·	Done in the 3rd apparition. Petr [2017-09-17 05:58, Ondrejov]

·	Julian Oey has observed this binary Julianoey :-) on 8 nights in July: http://www.asu.cas.cz/~asteroid/20325_2017a_porb.png http://www.asu.cas.cz/~asteroid/20325_2017a_p1.png More data (with errors <= 0.03 mag) would be useful for further refining its orbital model; event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2017- 9- 9 14.10 0.257 2017- 9-10 13.63 0.257 2017- 9-11 13.17 0.257 2017- 9-12 12.70 0.257 2017- 9-13 12.23 0.257 2017- 9-14 11.76 0.257 2017- 9-15 11.29 0.257 2017- 9-16 10.83 0.257 2017- 9-17 10.36 0.257 2017- 9-18 9.89 0.257 2017- 9-19 9.42 0.257 2017- 9-20 8.95 0.257 2017- 9-21 8.49 0.257 2017- 9-22 8.02 0.257 2017- 9-23 7.55 0.257 2017- 9-24 7.08 0.257 2017- 9-25 6.61 0.257 2017- 9-26 6.15 0.257 2017- 9-27 5.68 0.257 2017- 9-28 5.21 0.257 Date/Time UTC (LTc.) Phase -------------------------- 2017- 9- 9 2.32 0.757 2017- 9-10 1.86 0.757 2017- 9-11 1.39 0.757 2017- 9-12 0.92 0.757 2017- 9-13 0.45 0.757 2017- 9-13 23.98 0.757 2017- 9-14 23.52 0.757 2017- 9-15 23.05 0.757 2017- 9-16 22.58 0.757 2017- 9-17 22.11 0.757 2017- 9-18 21.64 0.757 2017- 9-19 21.18 0.757 2017- 9-20 20.71 0.757 2017- 9-21 20.24 0.757 2017- 9-22 19.77 0.757 2017- 9-23 19.30 0.757 2017- 9-24 18.84 0.757 2017- 9-25 18.37 0.757 2017- 9-26 17.90 0.757 2017- 9-27 17.43 0.757 2017- 9-28 16.96 0.757 Clear Skies, Petr [2017-08-31 09:32, Ondrejov]

·	Appropriately, I Started observing the return binary on July 15,19,20,21,22,23,24,26 [2017-08-05 12:54, Blue Mountains Obs]

(8306) Shoko (Finished) - 3-period system		[Add new note]
·	This 3-period system is closed for the 3rd apparition. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2024-03-01 13:06, Ondrejov]



·	Starting this return 3-period system tonight. Don [2023-08-23 00:36, Sugarloaf]



·	Our discovery has been published in IAUC 9268, see the copy below. Cheers, Petr (8306) SHOKO P. Pravec, P. Kusnirak, K. Hornoch, and A. Galad, Ondrejov Observatory and European Southern Observatory, La Silla; Yu. N. Krugly and V. Chiorny, Kharkiv Observatory; R. Inasaridze, O. Kvaratskhelia, and V. Ayvazian, Abastumani Observatory; O. Parmonov, Maidanak Observatory; J. Pollock, Appalachian State University; S. Mottola, Calar Alto Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; J. Zizka and J. Vrastil, Charles University, Prague; I. Molotov, Keldish Institute of Applied Mathematics, Moscow; and D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A. LaCluyze, Physics and Astronomy Department, University of North Carolina at Chapel Hill, report that photometric observations obtained during 2013 Sept. 7-Dec. 7 reveal that minor planet (8306) is a binary system with an orbital period of 36.20 ± 0.04 hr. The primary shows a period of 3.3503 ± 0.0002 hr, and it has a lightcurve amplitude of 0.11 mag at solar phases 3-13 deg, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are up to 0.26 mag deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.40. The secondary shows a period equal to the orbital period, indicating synchronous rotation. Residuals of the fit show an additional brightness variation that may be due to rotation of a third body of the system. The mean absolute R magnitude of the system is H_R = 14.83 ± 0.07, assuming G = 0.24 ± 0.11. These observations were run as a part of their photometric project "NEOSource" within its task to study binary and multiple systems among minor-planet pairs [i.e., pairs of minor planets that are in highly similar heliocentric orbits (see Vokrouhlicky and Nesvorny 2008, A.J. 136, 280; Pravec et al. 2010, Nature 466, 1085)]. Minor planet (8306) was selected as a target when found that it appears paired with minor planet 2011 SR_158 using the method of Pravec and Vokrouhlicky (2009, Icarus 204, 580), modified with use of the mean elements from AstDyS-2 (see website URL http://hamilton.dm.unipi.it/astdys2/) and with backward integrations of their orbits using the method of Vokrouhlicky (2009, Ap.J. 706, L37). The integrations indicate that the pair separated from a single body between 300 and 650 kyr ago. 2013 December 28 (9268) Daniel W. E. Green [2013-12-31 08:41, Ondrejov]

·	Started a run at 00:20 UT and will, clouds permitting, catch most of the 0.735 phase event. Don [2013-11-08 00:22, Sugarloaf]

·	Started a run at 23:00, Nov 1 UT and hope to catch the 0.735 phase event. Don [2013-11-01 23:03, Sugarloaf]

·	Observed for 6 hours tonight and covered 0.25-phase event. Peter K. [2013-10-30 23:23, Ondrejov]

·	Observed for 3 hours last night (with cadence of one "point" per hour). Peter K. [2013-10-29 09:15, Ondrejov]

·	Event ephemeris updated with our 2013 Oct 25-28 observations with DK154: Date/Time UTC (LTc.) Phase -------------------------- 2013-10-29 7.29 0.235 2013-10-30 19.49 0.235 2013-11- 1 7.69 0.235 2013-11- 2 19.89 0.235 2013-11- 4 8.09 0.235 2013-11- 5 20.29 0.235 2013-11- 7 8.49 0.235 2013-11- 8 20.69 0.235 2013-11-10 8.89 0.235 Date/Time UTC (LTc.) Phase -------------------------- 2013-10-30 1.41 0.735 2013-10-31 13.61 0.735 2013-11- 2 1.81 0.735 2013-11- 3 14.01 0.735 2013-11- 5 2.21 0.735 2013-11- 6 14.41 0.735 2013-11- 8 2.61 0.735 2013-11- 9 14.81 0.735 Clear Skies, Petr [2013-10-28 13:13, Ondrejov]

·	Additional observations for this 3-period paired asteroid were taken by Peter Kusnirak and Kamil Hornoch with DK154 on La Silla (2 nights), O. Parmonov and Yura Krugly from Maidanak (2), Don Pray from Sugarloaf Mountain (2), Julian Oey from Leura (1), Vasilij Shevchenko from Kharkiv (1), and R. Inasaridze from Abastumani (1). Current solution: http://www.asu.cas.cz/~asteroid/008306_porb.png http://www.asu.cas.cz/~asteroid/008306_p1.png http://www.asu.cas.cz/~asteroid/008306_p2.png More observations for the events in particular would be useful. Errors < 0.03 mag are needed. Events ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2013-10-23 6.15 0.253 2013-10-24 18.30 0.253 2013-10-26 6.45 0.253 2013-10-27 18.60 0.253 2013-10-29 6.75 0.253 2013-10-30 18.90 0.253 2013-11- 1 7.05 0.253 2013-11- 2 19.20 0.253 2013-11- 4 7.35 0.253 2013-11- 5 19.50 0.253 2013-11- 7 7.65 0.253 2013-11- 8 19.80 0.253 2013-11-10 7.95 0.253 Date/Time UTC (LTc.) Phase -------------------------- 2013-10-22 11.92 0.749 2013-10-24 0.07 0.749 2013-10-25 12.22 0.749 2013-10-27 0.37 0.749 2013-10-28 12.52 0.749 2013-10-30 0.67 0.749 2013-10-31 12.82 0.749 2013-11- 2 0.97 0.749 2013-11- 3 13.12 0.749 2013-11- 5 1.27 0.749 2013-11- 6 13.42 0.749 2013-11- 8 1.57 0.749 2013-11- 9 13.72 0.749 Clear Skies, Petr [2013-10-15 06:32, Ondrejov]

·	Started tonight on 16UT at Abastumani. Regars, Yura [2013-10-09 17:22, Kharkiv]

·	Thanks to the great effort from a few stations, we are getting a solution now. And it is an interesting one. Since my message on October 3, following observations were added: 5 nights by Peter Kusnirak, Kamil Hornoch and Jan Vrastil from here, 2+1 nights by Joe Pollock with Prompt+SSOPrompt, 1 night by Julian Oey from Leura, and 1 night by Vasilij Chiorny from Kharkiv. Three more events were captured. We have a unique solution for the orbital period: 36.15 h. The events are evolving rapidly, they deepen from night to night; we are apparently moving into the eclipse geometry fast. Monitoring the events during following days and weeks will be very useful. This is the first case ever where I had to fit as many as THREE rotational lightcurve components (outside events). There is a period of 3.3503 h which apparently belongs to the primary. Then there is a rotational lightcurve component with period equal to the orbital period; it is apparently a lightcurve of the eclipsing, and synchronous, satellite. And, in addition, we have there present a third lightcurve component for which I'm getting a likely period (U = 2+) of 60.9 h. See following plots of the individual components: http://www.asu.cas.cz/~asteroid/008306_porb.png http://www.asu.cas.cz/~asteroid/008306_p1.png http://www.asu.cas.cz/~asteroid/008306_p2.png (Note that in the first plot, observations taken earlier in the lunation didn't show mutual events; we are moving into the eclipse geometry recently.) The 60.9-h lightcurve component may belong to a third body in the system, but we will need more data to establish interpretation. Ideally, we would like to get events also from the ternary. Well, there is a chance that its events will begin to occur as we are moving deeper into the eclipse geometry for the secondary, if the ternary's orbit is co-planar. We'll see. More data for the events in particular are needed; events ephemeris is below. Outside events, only calibrated/linked data are going to be useful for this complex system; don't bother taking relative data at times substantially away from the events. Date/Time UTC (LTc.) Phase -------------------------- 2013-10- 9 16.59 0.247 2013-10-11 4.74 0.247 2013-10-12 16.89 0.247 2013-10-14 5.04 0.247 2013-10-15 17.19 0.247 Date/Time UTC (LTc.) Phase -------------------------- 2013-10-10 10.72 0.749 2013-10-11 22.87 0.749 2013-10-13 11.02 0.749 2013-10-14 23.17 0.749 Clear Skies, Petr [2013-10-09 13:56, Ondrejov]

·	Started this at 00:50 UT, Oct 9. I should get 5.5 hours on it. Don [2013-10-09 01:03, Sugarloaf]

·	Observing from 18 UT tonight. Event captured. Peter K. [2013-10-09 00:10, Ondrejov]

·	Last Night Prompt Chile - Observed from 0236-0452 UT then 0519-0553 UT. Otherwise clouds. Hopefully got event at 0426. Last Night Prompt Siding Spring - Continuous run from 0942-1653 UT under good conditions. Joe [2013-10-08 17:18, Dark Sky & PROMPT]

·	Began run from Prompt in Chile at 0235 UT. Hope to cover possible event at 0426 UT. Joe [2013-10-08 02:37, Dark Sky & PROMPT]

·	Observing from 18:10 UT. Peter K. [2013-10-07 22:33, Ondrejov]

·	observed from 10 h to 16h 10/04. Clear weather. [2013-10-04 21:52, Blue Mountains Obs]

·	Trying this one in unpredictable (now worsened) conditions. Best wishes, Kamil [2013-10-04 19:24, Ondrejov]

·	Began observations from Prompt Chile at 2345 UT. Hope to run until 0745 UT. Will then try to observe from Prompt Siding Spring from about 0900 UT to 1700 UT. Joe [2013-10-03 23:56, Dark Sky & PROMPT]

·	Observing from 18:20 UT tonight. Peter K. [2013-10-03 19:26, Ondrejov]

·	Dear All, We are working the primary of the asteroid pair 8306-2011SR158 since 2013-09-07. We took 8 calibrated nights from Ondrejov, Stefano Mottola took two relative nights from Calar Alto, R. Inasaridze and Yura Krugly took one relative night from Abastumani, and Vasilij Chiorny took one relative night from Kharkiv. The asteroid shows a short period of 3.35 h, as expected for the low size ratio of this pair (Delta H ~ 3.1) from the rotational fission formation theory (Pravec et al. 2010), but there is more than that. The paired asteroid is probably a binary system, like a few other systems we found within our NEOSource project with the Danish 1.54-m telescope at La Silla recently, see the talk I gave on the Binaries 3 meeting on Hawaii in June: http://www.asu.cas.cz/~ppravec/Bin-3_abs_Pravec.pdf http://www.asu.cas.cz/~ppravec/bin3.ppt In 8306, there appears to be a second rotational lightcurve component with a likely period of 64.3 h (U = 2+), and there are also additional deviations, some of which may be mutual events in the system. Particularly suspicious are two sharp, short (~1.2 h ) attenuations that we observed on 09-29.9 and 10-02.9 (the x-ed points in the second plot below). See the primary and the probable secondary lightcurves: http://www.asu.cas.cz/~asteroid/008306_p1.png http://www.asu.cas.cz/~asteroid/008306_p2.png We need to nail down P_2 and to establish P_orb (different from P_2). As they both are long, we need your help. We would highly appreciate if you could observe the asteroid during coming nights. Long sessions and photometric errors not greater than 0.02 mag are needed. Calibrations of your data in a consistent magnitude system would be quite useful if they are accurate to 0.02 mag. Clear Skies, Petr [2013-10-03 09:27, Ondrejov]

(7344) Summerfield (Finished) - binary		[Add new note]
·	This one is closed for the 3rd apparition. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2024-03-01 13:01, Ondrejov]

·	I did a session on this on Nov 20. Don [2023-11-21 17:10, Sugarloaf]



·	Done in 2nd apparition. Petr [2021-07-19 10:29, Ondrejov]

·	observed on 05/16 and 05/17 [2021-05-19 12:41, Blue Mountains Obs]

·	Starting an out of event run on this at 01:40 UT. Don [2021-05-14 01:37, Sugarloaf]

·	Don Pray took a good session covering event yesterday; current lc decomposition: http://www.asu.cas.cz/~asteroid/07344_2021a_porb.png http://www.asu.cas.cz/~asteroid/07344_2021a_p1.png More good data (errors < 0.02 mag) are needed. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2021- 5-13 14.91 0.255 2021- 5-14 8.32 0.255 2021- 5-15 1.74 0.255 2021- 5-15 19.16 0.255 2021- 5-16 12.57 0.255 2021- 5-17 5.99 0.255 2021- 5-17 23.40 0.255 2021- 5-18 16.82 0.255 2021- 5-19 10.24 0.255 2021- 5-20 3.65 0.255 2021- 5-20 21.07 0.255 Date/Time UTC (LTc.) Phase -------------------------- 2021- 5-13 23.61 0.755 2021- 5-14 17.02 0.755 2021- 5-15 10.44 0.755 2021- 5-16 3.85 0.755 2021- 5-16 21.27 0.755 2021- 5-17 14.69 0.755 2021- 5-18 8.10 0.755 2021- 5-19 1.52 0.755 2021- 5-19 18.93 0.755 2021- 5-20 12.35 0.755 Clear Skies, Petr [2021-05-13 12:18, Ondrejov]

·	I started a run on this at 02:20 UT. Don [2021-05-12 02:25, Sugarloaf]

·	This return binary was observed by Hana Kucakova and Kamil Hornoch from here on the past two nights. There appears to be a part of event; a tentative lc decomposition: http://www.asu.cas.cz/~asteroid/07344_2021a_porb.png http://www.asu.cas.cz/~asteroid/07344_2021a_p1.png More high-quality data (errors < 0.015 mag) are needed. As there will be other high-priority targets here on coming nights ---this target was observed as a supplementary target here on the past nights and we don't have a telescope time to take more data for it on coming nights---, I encourage others here to take over. A tentative event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2021- 4-11 8.22 0.250 2021- 4-12 1.63 0.250 2021- 4-12 19.04 0.250 2021- 4-13 12.45 0.250 2021- 4-14 5.86 0.250 2021- 4-14 23.27 0.250 2021- 4-15 16.68 0.250 2021- 4-16 10.09 0.250 2021- 4-17 3.50 0.250 2021- 4-17 20.91 0.250 2021- 4-18 14.32 0.250 2021- 4-19 7.73 0.250 2021- 4-20 1.14 0.250 2021- 4-20 18.55 0.250 2021- 4-21 11.96 0.250 2021- 4-22 5.37 0.250 2021- 4-22 22.78 0.250 2021- 4-23 16.19 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2021- 4-11 16.91 0.750 2021- 4-12 10.32 0.750 2021- 4-13 3.73 0.750 2021- 4-13 21.14 0.750 2021- 4-14 14.55 0.750 2021- 4-15 7.96 0.750 2021- 4-16 1.37 0.750 2021- 4-16 18.78 0.750 2021- 4-17 12.19 0.750 2021- 4-18 5.60 0.750 2021- 4-18 23.01 0.750 2021- 4-19 16.42 0.750 2021- 4-20 9.83 0.750 2021- 4-21 3.24 0.750 2021- 4-21 20.65 0.750 2021- 4-22 14.06 0.750 2021- 4-23 7.47 0.750 Clear Skies, Petr [2021-04-11 06:55, Ondrejov]



·	Insufficient data, target closed. Petr [2019-12-10 09:01, Ondrejov]

·	Started this rather dim target on Dec 1 UT. Don [2019-12-02 01:16, Sugarloaf]



·	Our announcement on this one has appeared on CBET 4412, copied below for your convenience. Cheers, Petr (7344) SUMMERFIELD D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; P. Pravec, H. Kucakova, K. Hornoch, and P. Kusnirak, Ondrejov Observatory; V. Chiorny, Kharkiv Observatory; N. Gaftonyuk, Crimean Astrophysical Observatory; and V. Benishek, Belgrade Astronomical Observatory, report that photometric observations taken with a 0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.65-m telescope at the Ondrejov Observatory, a 0.70-m telescope at the Chuguev station of the Kharkiv Observatory in Ukraine, a 1.0-m telescope at the Crimean Astrophysical Observatory, and a 0.35-m telescope at the Sopot Observatory in Serbia during May 16-June 15 reveal that minor planet (7344) is a binary system with an orbital period of 17.41 Â± 0.01 hr. The primary shows a period of 2.58975 Â± 0.00003 hr and has a lightcurve amplitude of 0.17 mag at solar phases 9-15 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.03- to 0.07-magnitude deep indicate a secondary-to-primary mean-diameter ratio of 0.18 Â± 0.03. The mean absolute R magnitude in the Cousins system is H_R = 12.88 Â± 0.08, assuming the phase relation slope parameter G = 0.24 Â± 0.11. 2017 July 5 (CBET 4412) Daniel W. E. Green [2017-07-10 06:57, Ondrejov]

·	We have finished observations for this new binary, and do a CBET now. With D_2/D_1 = 0.18 +/- 0.03, this one is at the effective limit for our binary asteroid survey ---btw, it's still the same limit as we had in our binary NEA survey Pravec et al. 2006---, but the events are consistently detected thanks to the good quality data with errors 0.01-0.02 mag. http://www.asu.cas.cz/~asteroid/07344_porb.png http://www.asu.cas.cz/~asteroid/07344_p1.png Cheers, Petr [2017-07-04 09:04, Ondrejov]

·	Plan to start this at 01:40 to catch the 0.25 event at 4.56 UT. Don [2017-06-21 01:25, Sugarloaf]

·	I observed the event 0.25. Nelya. [2017-06-16 01:52, Simeiz]

·	I started this at 01:40 UT, and hope to catch the 0.250 event. Don [2017-06-15 01:52, Sugarloaf]

·	Observed on June 03-04, 20:04-01:12 UT. Vladimir [2017-06-04 16:13, Sopot AO]

·	Our current solution: http://www.asu.cas.cz/~asteroid/07344_porb.png http://www.asu.cas.cz/~asteroid/07344_p1.png P_orb is unique now. One more coverage of the 0.25-phase event with errors < 0.02 mag (probably after the Full Moon) is needed before we publish this one on CBET. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2017- 6- 4 22.95 0.250 2017- 6-12 22.46 0.250 2017- 6-13 15.87 0.250 2017- 6-14 9.28 0.250 2017- 6-15 2.69 0.250 2017- 6-15 20.10 0.250 2017- 6-16 13.51 0.250 2017- 6-17 6.92 0.250 2017- 6-18 0.33 0.250 2017- 6-18 17.74 0.250 2017- 6-19 11.15 0.250 2017- 6-20 4.56 0.250 2017- 6-20 21.97 0.250 2017- 6-21 15.38 0.250 2017- 6-22 8.79 0.250 2017- 6-23 2.20 0.250 2017- 6-23 19.61 0.250 2017- 6-24 13.02 0.250 2017- 6-25 6.43 0.250 2017- 6-25 23.84 0.250 2017- 6-26 17.25 0.250 2017- 6-27 10.66 0.250 2017- 6-28 4.07 0.250 2017- 6-28 21.48 0.250 2017- 6-29 14.89 0.250 2017- 6-30 8.30 0.250 2017- 7- 1 1.71 0.250 2017- 7- 1 19.12 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2017- 6- 5 7.71 0.754 2017- 6-12 13.81 0.754 2017- 6-13 7.22 0.754 2017- 6-14 0.63 0.754 2017- 6-14 18.04 0.754 2017- 6-15 11.45 0.754 2017- 6-16 4.86 0.754 2017- 6-16 22.27 0.754 2017- 6-17 15.68 0.754 2017- 6-18 9.09 0.754 2017- 6-19 2.50 0.754 2017- 6-19 19.91 0.754 2017- 6-20 13.32 0.754 2017- 6-21 6.73 0.754 2017- 6-22 0.14 0.754 2017- 6-22 17.55 0.754 2017- 6-23 10.96 0.754 2017- 6-24 4.37 0.754 2017- 6-24 21.78 0.754 2017- 6-25 15.19 0.754 2017- 6-26 8.60 0.754 2017- 6-27 2.01 0.754 2017- 6-27 19.42 0.754 2017- 6-28 12.83 0.754 2017- 6-29 6.24 0.754 2017- 6-29 23.65 0.754 2017- 6-30 17.06 0.754 2017- 7- 1 10.47 0.754 2017- 7- 2 3.88 0.754 Clear Skies, Petr [2017-06-04 14:25, Ondrejov]

·	I started this at 02:40 UT. Don [2017-06-04 02:35, Sugarloaf]

·	Started this one at 02:00 UT. Don [2017-06-03 01:57, Sugarloaf]

·	At last, a clear night. I started this at 01:45 UT. [2017-06-02 01:50, Sugarloaf]

·	I observed this target on 01 June from 19:15 UT. Vasilij Ch. [2017-06-01 23:47, Kharkiv]

·	Another night by Hana Kucakova and Kamil Hornoch from here joined in, captured another event. P_orb is likely 17.41 h, but a couple other values are not entirely ruled out yet, so more data at any times are needed. The current preferred solution: http://www.asu.cas.cz/~asteroid/07344_porb.png http://www.asu.cas.cz/~asteroid/07344_p1.png I point out that errors not greater than 0.02 mag are needed and long sessions are preferred. Clear Skies, Petr [2017-06-01 09:29, Ondrejov]

·	Additional observations by Hana Kucakova, Kamil Hornoch and Peter Kusnirak from here and by Vladimir Benishek from Sopot were taken. Thanks to the precisely linked Ondrejov observations, we have resolved another event. There are several possible values for P_orb, the following plot is for one of them: http://www.asu.cas.cz/~asteroid/07344_porb.png http://www.asu.cas.cz/~asteroid/07344_p1.png We need to capture more events so that we can nail down it. Errors not greater than 0.02 mag are needed and long sessions are preferred. Clear Skies, Petr [2017-05-31 05:15, Ondrejov]

·	Started this target at 20 h UT. Nelya. [2017-05-28 21:32, Simeiz]

·	This new target has been observed by Don Pray from Sugarloaf Mountain, by Vasilij Chiorny from Kharkiv, and by Hana Kucakova and Kamil Hornoch from here. There appears to be an attenuation in the first 10 points of the 2017-05-21 run, see http://www.asu.cas.cz/~asteroid/07344.png http://www.asu.cas.cz/~asteroid/07344_20170521.png We need to take more data to confirm it. Errors not greater than 0.02 mag are needed and long sessions are preferred. I encourage others here to help out Don. Clear Skies, Petr [2017-05-27 11:34, Ondrejov]

·	Observed this one on 24 May from 20:55 to 23:40 UT. Vasilij Ch. [2017-05-24 23:48, Kharkiv]

·	Observed this target about 4 hrs from 19:25 UT. Vasilij Ch. [2017-05-23 23:31, Kharkiv]

·	Don Pray took first data for this new target. However, the solution is not unique; one of a couple possible solutions: http://www.asu.cas.cz/~asteroid/07344.png Two consecutive nights (with errors < 0.03 mag) are needed to nail down it. As the weather forecast for Don's station is poor for the next week, we encourage others here to help out with (effectively take over) this target. Clear Skies, Petr [2017-05-22 12:23, Ondrejov]

·	Did a run on this new target on May 16 UT. Don [2017-05-17 01:39, Sugarloaf]

(7343) Ockeghem - Returning paired asteroid		[Add new note] [Send data to: peter@asu.cas.cz ]
·	I have one isolated clear night. So I will try to get a run on this object for this lunation. Russ [2024-02-13 01:23, Shed of Science]

·	Started this one on Jan 15. Don [2024-01-16 01:29, Sugarloaf]



·	Done for this apparition. Petr [2021-03-11 09:53, Ondrejov]

·	I took 2 sessions on this on Mar 8 and 10. Don [2021-03-10 20:37, Sugarloaf]



·	Done for this apparition. Petr [2019-10-07 12:09, Ondrejov]

·	I did a second run on this Sep 21. Don [2019-09-22 01:09, Sugarloaf]

·	Starting this at 01:55 UT. Don [2019-09-20 01:34, Sugarloaf]



·	Done for this apparition. Petr [2016-12-28 13:48, Ondrejov]

·	Started a run at 22:45, Dec 25 UT, and will observe until 03:00, Dec 26. Don [2016-12-26 01:08, Sugarloaf]

·	Started this at 01:00 UT. DOn [2016-10-26 01:29, Sugarloaf]

·	Did a run on this returning paired asteroid on Sep 23 UT. Don [2016-09-24 18:25, Sugarloaf]



·	Don Pray observed it on five nights in this lunation: http://www.asu.cas.cz/~asteroid/007343_201401.png http://www.asu.cas.cz/~asteroid/007343_201311.png Taking one last session (one period sufficient) in the next lunation will be useful for future spin&shape modeling. Clear Skies, Petr [2014-01-10 08:49, Ondrejov]

·	Started a run at 23:50, Jan 7 UT. Don [2014-01-08 03:39, Sugarloaf]

·	Started a run at 23:50, Jan 4 UT. Don [2014-01-05 00:22, Sugarloaf]

·	Cancelling 3073 and doing this one instead. Don [2014-01-04 03:22, Sugarloaf]

·	Don Pray observed this return paired asteroid from Sugarloaf Mountain recently: http://www.asu.cas.cz/~asteroid/007343_b3.png This is sufficient data for this lunation. Cheers, Petr [2013-12-02 09:20, Ondrejov]

·	Observed at Abastumani on Nov 23/24. [2013-12-02 09:15, Kharkiv]

·	Started a run at 02:45 UT. Don [2013-11-30 02:36, Sugarloaf]



·	This primary of the asteroid pair 7343-154634, also a "prime suspect" for being a binary, has been worked well for this apparition. We have received following data: 4 nights from Modra, 1 night from Skalnate Pleso and 1 night from SRO. Current solution: http://www.asu.cas.cz/~asteroid/007343_b1.png More data have been announced here in the binast-webtool, they will be joined in when they come. No more observations are needed for now. Cheers, Petr [2011-02-28 14:43, Ondrejov]

·	Will work later tonight from SRO. -Walt [2011-02-28 03:23, Sonoita]

·	Observing from 17:20 UT in good conditions. Michal [2011-02-27 20:45, SkalnatePleso]	[Remove]

·	Working from SRO tonight. -Walt [2011-02-25 02:52, Sonoita]

·	Object observing from 22:20 UT. Gabo [2011-02-24 21:54, SkalnatePleso]	[Remove]

·	Observed 23/24.2. 19:00-2:30 UT, data fit in well with our january observations. Jozef, Leos. [2011-02-24 11:31, Modra]

·	Began observing from T1M at Pic du Midi 02/01 at 22 UT until 5 UT we observed the previous night, but rapidly the fog came... [2011-02-02 23:38, Pic du Midi]

·	Observing from 23:05 UT in good conditions. Michal [2011-02-01 23:08, SkalnatePleso]	[Remove]

·	Began observing from T1M at Pic du Midi 02/01 at 22 UT until 5 UT we observed the previous night, but rapidly the fog came... [2011-02-01 23:05, Pic du Midi]

·	Began observing from Prompt 02/01 at 0245 UT under good conditions but high wind interrupted at 0450 UT. Joe [2011-02-01 16:29, Dark Sky & PROMPT]

·	Interrupted at ~23UT. Jozef [2011-01-31 01:34, Modra]

·	Another try tonight, starting ... surrounded by fog. Jozef [2011-01-30 20:32, Modra]

·	Weather did not hold, so anyone can take over now. Jozef, Stefan. [2011-01-29 20:39, Modra]

·	Planning this one tonight, if weather permits. Jozef, Stefan. [2011-01-29 16:17, Modra]

·	Observing it from 20:24 UT on Jan.28, 2011. Stefan/Jozef [2011-01-28 22:42, Modra]

·	Observed it on Jan. 27/28, 2011. Jozef/Stefan [2011-01-28 15:45, Modra]

(11548) Jerrylewis		[Add new note] [Send data to: peter@asu.cas.cz ]
·	Completed a few nights on this object and sent the data to Petr. Russ [2024-01-19 01:07, Shed of Science]



·	Vladimir Benishek observed this new target from Sopot: Good solution and coverage, no significant deviation. http://www.asu.cas.cz/~asteroid/11548.png Target closed. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2019-12-17 15:08, Ondrejov]

(7355) Bottke (Finished) - binary		[Add new note]
·	Our report on this one has appeared on CBET 5319, copied below for your convenience. Cheers, Petr (7355) BOTTKE V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; and J. Oey, Blue Mountains Observatory, Leura, NSW, Australia, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.63-m telescope at the Sugarloaf Mountain Observatory, and a 0.35-m telescope at the Blue Mountains Observatory during Oct. 29-Nov. 17 reveal that minor planet (7355) is a binary system with an orbital period of 40.85 Â± 0.04 hr. The primary shows a period of 2.6364 Â± 0.0002 hr and has a lightcurve amplitude of 0.26 mag at solar phases 15-22 degrees. Mutual eclipse/occultation events that are 0.13 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.36. 2023 November 27 (CBET 5319) Daniel W. E. Green [2023-11-27 08:37, Ondrejov]

·	Observed 11/16 and 11/17 under good condition. [2023-11-18 07:08, Blue Mountains Obs]

·	More data taken for this one by Vladimir Benishek from Sopot. Likely solution: https://www.asu.cas.cz/~asteroid/07355_2023a_porb.png https://www.asu.cas.cz/~asteroid/07355_2023a_p1.png The events are W-shaped, as expected for the eclipses and occultations occuring at significantly non-zero solar phases for this system where the two bodies are not quite close one to each other. More data (errors not greater than 0.015 mag) are needed to confirm the solution. Event ephemeris (but don't limit your observations too narrowly around the predicted mid-event times, as the solution is still not very reliable): Date/Time UTC (LTc.) Phase -------------------------- 2023-11-14 1.98 0.241 2023-11-15 18.88 0.241 2023-11-17 11.78 0.241 2023-11-19 4.68 0.241 2023-11-20 21.58 0.241 Date/Time UTC (LTc.) Phase -------------------------- 2023-11-14 22.57 0.745 2023-11-16 15.47 0.745 2023-11-18 8.37 0.745 2023-11-20 1.27 0.745 Clear Skies, Petr [2023-11-13 12:17, Ondrejov]

·	Vladimir Benishek has observed this returned "prime suspect" from Sopot, detected a suspect attenuation. A tentative lc decomposition (may be wrong): https://www.asu.cas.cz/~asteroid/07355_2023a_p1.png https://www.asu.cas.cz/~asteroid/07355_2023a_porb.png (Note: The period in the 2nd plot above was set just for plotting purpose, there is no real determination of P_orb yet.) More data (errors not greater than 0.015 mag) are needed to confirm it and establish its orbit period. Clear Skies, Petr [2023-11-02 15:05, Ondrejov]



·	This new target was observed by Don Pray from Sugarloaf Mountain and by Vasilij Chiorny from Grakovo (Kharkiv): a U=2 result for the lightcurve symmetry allowing it to have a different number of maxima/minima per period than the assumed two, but otherwise it's a good coverage and no deviations seen, http://www.asu.cas.cz/~asteroid/07355.png Done for the Survey, http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Cheers, Petr [2013-11-19 14:29, Ondrejov]

·	I started a run on this at 01:20 UT. Got a good lc on it last night, but running it again as it's in the binary suspect range. Don [2013-11-09 01:32, Sugarloaf]

·	I plan to run this along with 5477 starting at 04:15, and running until 09:30 UT. Don [2013-11-08 00:26, Sugarloaf]

·	This new target I observed 5 November 2013 about 4 hr and 6 November - 2 hr. Period about 2.6 hr, ampl 0.2 mag. Vasilij Ch. [2013-11-07 20:26, Kharkiv]

(16233) 2000 FA12 - Returning prime suspect		[Add new note] [Send data to: peter@asu.cas.cz ]
·	I've 2 runs on this so far. Don [2023-11-02 22:48, Sugarloaf]



·	Vladimir Benishek has taken two usable nights from Sopot for this return "prime suspect". No significant deviations seen, http://www.asu.cas.cz/~asteroid/16233_b5.png Cf. with the data from the first two apparitions: http://www.asu.cas.cz/~asteroid/16233_b2.png http://www.asu.cas.cz/~asteroid/16233.png Target closed, http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Good work Vladimir despite your less-than-ideal weather these days. Petr [2015-12-15 12:44, Ondrejov]

·	Observed this target on Dec. 12-13, 19:18-04:23 UT and Dec. 13-14, 19:52-01:37 UT. Vladimir [2015-12-15 11:38, Sopot AO]



·	This "prime suspect" was done by Don Pray in this 2nd apparition, no prominent deviation seen: http://www.asu.cas.cz/~asteroid/16233_b2.png Cf. with the 2006 data by Oleg Gerashchenko from Andrushivka: http://www.asu.cas.cz/~asteroid/16233.png Target closed, http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2012-04-02 11:28, Ondrejov]

·	Started this around 00:30 UT as a secondary target with less dense data collection than for 3481. Don [2012-02-27 01:34, Sugarloaf]

·	Started this at 00:10 UT for a 6 hour run. This will be the final run on this one. At 06:00 UT I'll attempt a run on the fast-moving radar target 2000 ET70 and could potentially get 4 hours on that. [2012-02-18 00:44, Sugarloaf]

·	Started a run at 00:25 UT and will go until clouds arrive in a few hours. Don [2012-01-31 00:49, Sugarloaf]

·	Started a run at 00:40 UT, and may get 4-5 hours in before the clouds come. Don [2012-01-30 04:04, Sugarloaf]

·	Started this new target at ~01:50 UT. Light breeze isn't helping, but is forecast to diminish. Don [2012-01-22 02:00, Sugarloaf]



·	Three nights by Oleg Gerashchenko from Andrushivka Astronomical Observatory for this one: a unique period, good coverage, no significant deviation seen: http://www.asu.cas.cz/~asteroid/16233.png It has been done well for the Survey. A note on it put to http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Pretty work on both targets, Oleg! Keep up the nice work. Cheers, Petr [2006-10-30 13:38, Ondrejov]

(1785) Wurm - Returning prome suspect		[Add new note] [Send data to: peter@asu.cas.cz ]
·	I've observed this one twice so far. Don [2023-11-02 22:45, Sugarloaf]



·	Don Pray observed this "prime suspect" from Sugarloaf Mountain in its current apparition: No significant deviation seen. http://www.asu.cas.cz/~asteroid/01785_c0.png Target closed. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2020-12-21 13:43, Ondrejov]

·	Started this one at 03:10 UT. Don [2020-12-07 02:05, Sugarloaf]



·	Closed (it's insufficient data for BinAstPhotSurvey from this apparition). [2018-05-03 12:38, Ondrejov]

·	1785 Wurm observed last night from SARA SOUTH Chile. [2018-02-22 22:32, IAO-Isaac Aznar Obs.]



·	Don Pray has done this return "prime suspect" from Sugarloaf Mountain on three nights: Unique solution, good coverage, no significant deviation. http://www.asu.cas.cz/~asteroid/01785_b6.png Target done. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2016-09-27 06:53, Ondrejov]

·	Started this prime suspect Sep 23 UT. Don [2016-09-24 18:39, Sugarloaf]



·	Julian has done this one from Leura: Unique solution, sufficient coverage, excellent fit. It is finished for the Survey, http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Excellent work, Julian. Cheers, Petr [2008-03-07 10:27, Ondrejov]

·	Another excellent night for this target taken from 10:11UT to 18:37UT 2008-03-06. Period refined to 3.2696h+/-0.0004h. Amplitude remains the same. Julian [2008-03-07 03:45, Blue Mountains Obs]

·	observed from 10:27UT to 14:40UT in excellent condition. Initial period estimation 3.26 +/- 0.01h with period 0.22 +/- 0.01mag. Here hoping the clouds, fog and instrument gremlins will stay away for good. [2008-03-04 01:15, Blue Mountains Obs]

(7144) Dossobuono - new binary, more data needed		[Add new note] [Send data to: peter@asu.cas.cz ]
·	Starting a run on this one in good conditions. Russ [2023-09-21 01:09, Shed of Science]

·	Two more nights by Vladimir Benishek from Sopot joined in. A likely solution: https://www.asu.cas.cz/~asteroid/07144_2023a_porb.png https://www.asu.cas.cz/~asteroid/07144_2023a_p1.png More data (errors < 0.02 mag) are needed to confirm and improve the solution. A tentative event ephemeris (but don't limit your observations just around the predicted mid-event times; the solution is not very certain yet): Date/Time UTC (LTc.) Phase -------------------------- 2023- 9- 3 2.97 0.270 2023- 9- 4 15.77 0.270 2023- 9- 6 4.57 0.270 2023- 9- 7 17.37 0.270 2023- 9- 9 6.17 0.270 2023- 9-10 18.97 0.270 2023- 9-12 7.77 0.270 2023- 9-13 20.57 0.270 2023- 9-15 9.37 0.270 2023- 9-16 22.17 0.270 2023- 9-18 10.97 0.270 2023- 9-19 23.77 0.270 2023- 9-21 12.57 0.270 2023- 9-23 1.37 0.270 Date/Time UTC (LTc.) Phase -------------------------- 2023- 9- 3 20.38 0.743 2023- 9- 5 9.18 0.743 2023- 9- 6 21.98 0.743 2023- 9- 8 10.78 0.743 2023- 9- 9 23.58 0.743 2023- 9-11 12.38 0.743 2023- 9-13 1.18 0.743 2023- 9-14 13.98 0.743 2023- 9-16 2.78 0.743 2023- 9-17 15.58 0.743 2023- 9-19 4.38 0.743 2023- 9-20 17.18 0.743 2023- 9-22 5.98 0.743 2023- 9-23 18.78 0.743 Clear Skies, Petr [2023-08-29 07:28, Ondrejov]

·	Vladimir Benishek has observed this returned binary suspect from Sopot on 6 nights. A tentative lc decomposition (may be wrong): https://www.asu.cas.cz/~asteroid/07144_2023a_porb.png https://www.asu.cas.cz/~asteroid/07144_2023a_p1.png More high-quality data (errors < 0.015 mag) are needed to catch more events so that we can establish it well and determine its orbital period. Clear Skies, Petr [2023-08-25 08:17, Ondrejov]



·	This new target was worked by Vladimir Benishek from Sopot and by Walt Cooney and coll. from SRO. The period appears to be reasonably detected (U = 2+), but the two apparent attenuations seen in the first two nights by Vladimir need to be confirmed (and their period established) in the future. http://www.asu.cas.cz/~asteroid/07144.png http://www.asu.cas.cz/~asteroid/07144_nsp.png http://www.asu.cas.cz/~asteroid/07144_20150612.png http://www.asu.cas.cz/~asteroid/07144_20150613.png Petr [2015-07-02 10:25, Ondrejov]

·	Started this at 01:35 UT. Don [2015-06-25 01:37, Sugarloaf]

·	Got a free night on this one the other night when it was in the field with (8474) Rettig. Will work it again tonight. -Walt [2015-06-18 02:14, Sonoita]

(3042) Zelinsky		[Add new note] [Send data to: peter@asu.cas.cz ]
·	Sent three nights data to Petr and Peter on this one. Will continue to work when I can. Russ [2023-09-09 19:04, Shed of Science]



·	This new target was done by Don Pray from Sugarloaf Mountain and Vladimir Benishek from Sopot: It's a good U = 2 solution (for the low amplitude), multiple coverage, no deviation seen. http://www.asu.cas.cz/~asteroid/03042.png http://www.asu.cas.cz/~asteroid/03042_nsp.png Target closed for the BinAstPhotSurvey. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Good work guys on the low-amplitude object. Cheers, Petr [2016-07-29 06:53, Ondrejov]

·	Another session was obtained on July 11-12, 21:34-01:33 UT. Vladimir [2016-07-12 11:56, Sopot AO]

·	Plan to start this one at 04:30 UT. Don [2016-07-12 01:38, Sugarloaf]

·	I observed this target on July 10-11, 22:05-01:30 UT. Vladimir [2016-07-11 09:50, Sopot AO]

·	I started this new target on July 6. I also plan to observe it tonight. Don [2016-07-07 01:35, Sugarloaf]

(6108) Glebov - binary suspect, more data needed		[Add new note] [Send data to: peter@asu.cas.cz ]
·	observed on 08/25,08/24, 08/16. Good condition and data sent in. [2023-08-26 05:31, Blue Mountains Obs]

·	Starting a run on this under good conditions. Russ [2023-08-16 02:16, Shed of Science]

·	Russ Durkee has observed this target on two nights, found it to be a binary suspect. A tentative lc decomposition: https://www.asu.cas.cz/~asteroid/06108_2023b_p1.png https://www.asu.cas.cz/~asteroid/06108_2023b_porb.png (The period in the 2nd plot above was set just for plotting purpose. There is no real solution for P_orb yet.) More data are needed to confirm it. Clear Skies, Petr [2023-08-14 13:28, Ondrejov]

·	Starting a second night on this one. Russ [2023-08-14 03:46, Shed of Science]



·	This is a U = 2+ result. Closed for now, note put to http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2010-09-21 14:09, Ondrejov]

·	Observed 2010-08-30 in average conditions cut short by cloud. Data reveals a period of 2.84 +/- 0.02 hrs. Data is sparse and somewhat noisy with error bars on the 0.03mag limit. [2010-08-31 07:12, HuntersHill]

·	HHO has restricted observing capability but was able to provide some coverage of this target. Limited data in less than ideal conditions reveals a period of 2.74 +/- 0.03 hrs, 0.22 +/- 0.03 mag [2010-08-30 01:44, HuntersHill]

(8167) Ishii - binary or ternary candidate		[Add new note] [Send data to: peter@asu.cas.cz ]
·	Plan on starting this one in about 1 hour. Russ [2023-08-26 03:18, Shed of Science]

·	Did a short night on this one. Will continue to follow this lunation. Russ [2023-08-13 18:03, Shed of Science]



·	This new target was observed by Vladimir Benishek from Sopot and by Russ Durkee from Shed of Science South. It has two additive periods and there were superimposed two deep attenuations on February 6.1 and 9.1 suggesting mutual events with a longer period, see http://www.asu.cas.cz/~asteroid/08167_2021a_p1.png http://www.asu.cas.cz/~asteroid/08167_2021a_p2.png It is a serious binary (and possible ternary) candidate, but it needs to be established with high-quality thorough observations in the future. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2021-07-20 09:02, Ondrejov]

·	More observations by Vladimir Benishek from Sopot and by Russ Rurkee from Shed of Science South have led to an apparently unique solution for both rotational periods. Russ also catched on February 6 what appears to be an event (with a longer period), see the x-ed points in following plots: http://www.asu.cas.cz/~asteroid/08167_2021a_p1.png http://www.asu.cas.cz/~asteroid/08167_2021a_p2.png More data (errors <= 0.03 mag) are needed to catch more events and establish their period. I encourage others here to help out. Clear Skies, Petr [2021-02-09 09:03, Ondrejov]

·	Following this one tonight. Russ [2021-02-07 02:57, Shed of Science]

·	Vladimir Benishek has observed this new target from Sopot on 3 nights, found an interesting complex lightcurve. There seem to be two (or more) lc components, but the data are insufficient to get a solution. See following to get idea: http://www.asu.cas.cz/~asteroid/08167.png I encourage others here to help out. Clear Skies, Petr [2021-02-04 13:47, Ondrejov]

·	I worked this target on several nights. Vladimir [2021-02-03 08:04, Sopot AO]

(2496) Fernandus (Finished)		[Add new note]
·	Russ Durkee observed this returned "prime suspect" on 4 nights in its current 3rd apparition. Good coverage, no significant deviation seen. http://www.asu.cas.cz/~asteroid/02496_c3.png Target closed. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Good fast work, Russ! Petr [2023-08-03 08:51, Ondrejov]

·	I have two nights on this object and will follow tonight as well assuming the moon is far enough away. Russ [2023-07-26 00:21, Shed of Science]



·	Vasilij Chiorny observed this new target from Kharkiv on four nights: Unique solution, good coverage, no significant deviation. http://www.asu.cas.cz/~asteroid/02496.png Target closed for the Survey. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Good fast work, Vasilij. Petr [2019-04-16 12:48, Ondrejov]

(2883) Barabashov (Finished) - binary		[Add new note]
·	Incomplete coverage of P_orb/2, unfortunately. Petr [2023-07-13 08:20, Ondrejov]



·	Doing a run on this one tonight. Don [2022-11-20 00:26, Sugarloaf]

·	I observed this on Nov 2,3 and 4. Don [2022-11-08 02:52, Sugarloaf]



·	Our report on this new binary has appeared on CBET 4722, copied below for your convenience. Congratulations Russ for your first definite binary asteroid discovery! Cheers, Petr (2883) BARABASHOV R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; and P. Pravec, H. Kucakova, and K. Hornoch, Ondrejov Observatory, report that photometric observations taken with a 0.50-m telescope at the Shed of Science South Observatory and a 0.65-m telescope at the Ondrejov Observatory during 2019 Dec. 17-2020 Jan. 20 reveal that minor planet (2883) is a binary system with an orbital period of 43.12 Â± 0.01 hr. The primary shows a period of 2.6839 Â± 0.0002 hr and has a lightcurve amplitude of 0.08 magnitude at solar phases 1-7 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.06 to 0.08 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.25 Â± 0.02. 2020 February 5 (CBET 4722) Daniel W. E. Green [2020-02-06 08:21, Ondrejov]

·	Started this one tonight, hoping to catch the 0.75 deviation. Russ [2020-01-20 05:01, Shed of Science]

·	Recent observations by Russ Durkee from Shed of Science South and by Hana Kucakova, Kamil Hornoch and Peter Kusnirak from here provide a likely solution for this one: http://www.asu.cas.cz/~asteroid/02883_2019b_porb.png http://www.asu.cas.cz/~asteroid/02883_2019b_p1.png http://www.asu.cas.cz/~asteroid/02883_2019a_porb.png http://www.asu.cas.cz/~asteroid/02883_2019a_p1.png More high-quality (errors 0.01 mag) data are needed to improve the solution. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2020- 1-14 1.89 0.250 2020- 1-15 20.99 0.250 2020- 1-17 16.09 0.250 2020- 1-19 11.19 0.250 2020- 1-21 6.29 0.250 2020- 1-23 1.39 0.250 2020- 1-24 20.49 0.250 2020- 1-26 15.59 0.250 2020- 1-28 10.69 0.250 2020- 1-30 5.79 0.250 2020- 2- 1 0.89 0.250 2020- 2- 2 19.99 0.250 2020- 2- 4 15.09 0.250 Date/Time UTC (LTc.) Phase -------------------------- 2020- 1-14 23.20 0.745 2020- 1-16 18.30 0.745 2020- 1-18 13.40 0.745 2020- 1-20 8.50 0.745 2020- 1-22 3.60 0.745 2020- 1-23 22.70 0.745 2020- 1-25 17.80 0.745 2020- 1-27 12.90 0.745 2020- 1-29 8.00 0.745 2020- 1-31 3.10 0.745 2020- 2- 1 22.20 0.745 2020- 2- 3 17.30 0.745 Clear Skies, Petr [2020-01-09 08:17, Ondrejov]

·	Starting this one tonight at about 1 UT on 1/7 Russ [2020-01-07 03:02, Shed of Science]

·	Started this one again At 1UT on 1/6 Russ [2020-01-06 02:01, Shed of Science]

·	Should be able to follow this again tonight under good conditions starting at about 01:30 UT on 1/5 Russ [2020-01-04 23:29, Shed of Science]

·	Following again tonight under marginal conditions. Russ [2019-12-24 02:31, Shed of Science]

·	Following tonight, conditions not very good though. Russ [2019-12-23 04:39, Shed of Science]

·	Started again tonight about 3UT Russ [2019-12-22 05:08, Shed of Science]

·	Observing again tonight starting at about 3UT. Russ [2019-12-19 03:08, Shed of Science]

·	Will start tonight 12/18 3UT. Also have data from last night. Will process. Russ [2019-12-18 03:19, Shed of Science]



·	This new target was observed by Don Pray from Sugarloaf Mountain on six nights, supported with one night by Romain Montaigut and Arnaud Leroy from OPERA. http://www.asu.cas.cz/~asteroid/02883.png http://www.asu.cas.cz/~asteroid/02883_nsp.png Despite the period ambiguity, no significant deviation is apparent. Object closed. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Good effort guys on the tough target. Petr [2017-03-22 08:46, Ondrejov]

·	We also observed this new target on the night of 16/03. It seems to have a small amplitude. Arnaud and Romain [2017-03-19 00:08, OPERA]

·	I've observed this one on Mar 3,5,6 and 18. Don [2017-03-18 21:24, Sugarloaf]

(1829) Dawson (Finished) - binary suspect		[Add new note]
·	Suspect attenuations seen, but no consistent solution. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2023-07-13 08:00, Ondrejov]



·	Following Dawson again tonight. Russ [2022-09-30 02:10, Shed of Science]

·	Weather looks good tonight, will follow again. Russ [2022-09-28 00:09, Shed of Science]

·	Starting on this one again tonight. Russ [2022-09-20 02:01, Shed of Science]

·	Got two nights on this one on 9/16 and 9/17 will continue to follow. Russ [2022-09-18 15:28, Shed of Science]



·	Don Pray did this return "prime suspect" from Sugarloaf Mountain on three nights, supported with one night by Julian Oey: Good solution and coverage, no significant deviation. http://www.asu.cas.cz/~asteroid/01829_b7.png Target closed. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2017-02-06 07:40, Ondrejov]

·	I plan to start this prime suspect at 03:50 UT. Don [2017-02-02 01:11, Sugarloaf]



·	Closed for the 3rd apparition. One suspect attenuation unconfirmed. Petr [2015-10-26 09:33, Ondrejov]

·	Observed last night Oct. 03, 17:39 - 21:40 UT. Vladimir [2015-10-04 11:07, Sopot AO]

·	Observed on Oct. 02, 17:46 - 21:39 UT. Vladimir [2015-10-03 12:58, Sopot AO]

·	observed for 09/13 and 09/14 for 5 and 6 hours respectively. [2015-09-15 06:54, Blue Mountains Obs]

·	Julian Oey has taken four nights for this return "prime suspect" from Leura in its current 3rd apparition. There are two suspect attenuations, a deeper one on 09-01 and a shallow one on 09-12, see http://www.asu.cas.cz/~asteroid/01829_201509_porb.png http://www.asu.cas.cz/~asteroid/01829_201509_p1.png (The period in the first plot above is arbitrary; no solution for P_orb has been obtained.) No prominent deviations were seen in three good-quality runs taken by Michal Pikler and Marek Husarik from Skalnate Pleso in August http://www.asu.cas.cz/~asteroid/01829_201508_p1.png nor in the previous data taken by Don Pray and David Higgins from Carbuncle Hill and Hunters Hill in 2005 and 2007, respectively. A confirmation is needed; I enourage others here to help out. Good quality data (errors not greater than 0.02 mag) only will be useful. Clear Skies, Petr [2015-09-14 11:26, Ondrejov]

·	observed on 09/12 from 09:42 UT for 6 hours. [2015-09-13 01:27, Blue Mountains Obs]

·	observed on 09/09 and 09/11 [2015-09-12 05:00, Blue Mountains Obs]

·	observed on 09/01 found to have period of 4.2h and 0.26m amplitude [2015-09-02 11:05, Blue Mountains Obs]

·	Michal performed observations on two nights (5. and 6.Aug). Marek [2015-08-07 12:05, SkalnatePleso]	[Remove]



·	This "primary suspect" has been done well enough by David from Hunters Hill in its second apparition for the BinAstPhotSurvey: The period estimates from the two apparitions are in a reasonable agreement (within a few sigma), David has covered it reasonably, no significant deviation seen. It is finished for the Survey again, a note on it put to http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm In due time I will check for this (and other) follow-up targets how their 2nd apparition data improve a probability of binary detection .... Good work, David, on the follow-up target. Cheers, Petr [2007-03-22 17:13, Ondrejov]

·	Have been observing over the last week on and off between weather. 10/11/13/14th in average to poor conditions and lots of background stars to subtract. Data reveals a period of 4.2463 +/- 0.0009hrs with an amplitude of 0.20 +/- 0.02mag. No significant deviations noted. Cheers David [2007-03-16 10:35, HuntersHill]



·	This is an info that Don Pray has finished the target: P=4.254 +/- 0.001 h, three nights, double coverage, no deviation seen. Well done for the Survey. The note added to http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Very nice work, Don! Cheers, Petr [2005-09-20 06:20, Ondrejov]

·	I'll be starting this tonight (sep 11, 2005), weather permitting. [2005-09-10 22:53, CarbuncleHill]

(1169) Alwine (Finished) - binary candidate		[Add new note]
·	Remains a binary candidate. Needs to be confirmed with extensive and high-quality observations from two or more stations. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2023-07-13 07:47, Ondrejov]



·	Doing a run on this one tonight. Don [2022-10-15 01:31, Sugarloaf]

·	I'm doing a run on this one tonight, Sep 24 UT. Don [2022-09-24 00:54, Sugarloaf]

·	I started this on Sep 15 UT. Don [2022-09-15 20:28, Sugarloaf]



·	Despite extensive effort by Don Pray, Paolo Bacci and Vladimir Benishek, we have not obtained a satisfactory solution for this binary candidate. Several apparent attenuations fit roughly with a period of 54.45 h, but the fit is not very good, see following plots. http://www.asu.cas.cz/~asteroid/01169_2019a_porb.png http://www.asu.cas.cz/~asteroid/01169_2019a_p1.png http://www.asu.cas.cz/~asteroid/01169_2019b_porb.png http://www.asu.cas.cz/~asteroid/01169_2019b_p1.png http://www.asu.cas.cz/~asteroid/01169_2019c_porb.png http://www.asu.cas.cz/~asteroid/01169_2019c_p1.png http://www.asu.cas.cz/~asteroid/01169_2019d_porb.png http://www.asu.cas.cz/~asteroid/01169_2019d_p1.png It needs to be confirmed in the future. Target closed for this apparition. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2020-04-06 10:18, Ondrejov]

·	Started this at 00:05 UT. Don [2020-03-05 00:03, Sugarloaf]

·	Started this one at 00:10 UT. Don [2020-03-01 01:02, Sugarloaf]

·	Observing this one tonight. Don [2020-02-29 01:41, Sugarloaf]

·	Started a run on this one tonight....finally some clear skies! Russ [2020-02-25 02:26, Shed of Science]

·	Did a run on this on Feb 24 UT. Don [2020-02-24 20:59, Sugarloaf]

·	I observed this last night, Feb 22, and started a run tonight at 23:40, Feb 22 UT. Don [2020-02-22 23:52, Sugarloaf]

·	We observer on feb 21/22 22:15 UT to 01:20 UT from 104 B&M [2020-02-21 23:49, Paolo Bacci]

·	I observed this on Feb 20 and 21. Don [2020-02-21 21:02, Sugarloaf]

·	I got a session on this one on Feb. 15-16 UT. Vladimir [2020-02-16 13:57, Sopot AO]

·	I started this one at 00:45 UT. Don [2020-02-15 00:41, Sugarloaf]

·	A (still somewhat tentative) decomposition of our current data for this new binary: http://www.asu.cas.cz/~asteroid/01169_2019b_porb.png http://www.asu.cas.cz/~asteroid/01169_2019b_p1.png There remains an ambiguity in the P_orb solution that we need to resolve with more data. Only good data with errors < 0.02 mag will be useful; don't bother in less ideal conditions. Clear Skies, Petr [2020-02-06 10:05, Ondrejov]

·	I observed this one last night (Feb. 01-02). Vladimir [2020-02-02 13:30, Sopot AO]

·	Observing this tonight, Jan 30 UT. Don [2020-01-29 23:55, Sugarloaf]

·	I observed this one again on Jan 22 UT. Don [2020-01-22 13:59, Sugarloaf]

·	Don Pray has observed this new target from Sugarloaf Mountain. There appears to be a 0.06-mag deep attenuation in the first hour of his last night, see following tentative lc decomposition: http://www.asu.cas.cz/~asteroid/01169_2019b_porb.png http://www.asu.cas.cz/~asteroid/01169_2019b_p1.png More data (errors < 0.02 mag) are needed to confirm. Clear Skies, Petr [2020-01-22 09:51, Ondrejov]

·	Did a run on this Dec 23. Don [2019-12-24 01:51, Sugarloaf]

·	I observed this last night and plan to again, tonight (Dec 21). Don [2019-12-21 01:24, Sugarloaf]

(25884) Asai (Finished) - Paired Asteroid		[Add new note]
·	Target finished for this apparition. Petr [2023-07-11 09:28, Ondrejov]



·	Doing this one tonight. Don [2022-11-29 01:48, Sugarloaf]

·	Observing this tonight, Nov 22, UT. Don [2022-11-21 23:51, Sugarloaf]

·	Doing this one tonight. Don [2022-11-20 00:25, Sugarloaf]

·	I did runs on this paired asteroid on Oct 28 and 30. Don [2022-10-31 00:28, Sugarloaf]



·	This paired asteroid was done enough for this apparition. Petr [2016-08-31 07:36, Ondrejov]

·	observed 08/26 and 08/27 [2016-08-30 11:29, Blue Mountains Obs]

·	New target deep in the South [2016-07-02 22:57, Blue Mountains Obs]

(4905) Hiromi (Finished)		[Add new note]
·	Target closed for this apparition. Petr [2023-07-10 13:26, Ondrejov]



·	observed on several consecutive nights of this paired asteroid to obtain a period of 6.0449h consistent with previous result. 12/19,12/24,12/25,12/26,12/27,12/28 sessions were done. [2023-01-10 21:16, Blue Mountains Obs]



·	Target closed for this apparition. Petr [2019-03-19 13:54, Ondrejov]

·	Doing a run on this tonight for this lunation. Don [2019-02-01 02:27, Sugarloaf]



·	Done for the 3rd apparition. Petr [2017-11-19 12:35, Ondrejov]

·	Doing a run on this tonight for this lunation. Don [2017-11-18 00:35, Sugarloaf]

·	I did a run on this on Sep 10. Don [2017-09-10 20:10, Sugarloaf]

·	I observed this on Aug 22. DOn [2017-08-23 21:48, Sugarloaf]



·	Nice observations of the primary of the asteroid pair (our NEOSource project target) were taken by Don Pray from Sugarloaf Mountain and Julian Oey from Leura): http://www.asu.cas.cz/~asteroid/004905.png Done for now. Cheers, Petr [2013-09-30 10:26, Ondrejov]

·	observed from 13.5 to 18UT 09/29 , period about 6 hours. [2013-09-30 04:30, Blue Mountains Obs]

·	Plan to do a run on this at 04:20 UT. Don [2013-09-24 23:32, Sugarloaf]

·	I'll be starting this new target after 76818 sets at 04:35 UT. Don [2013-09-24 01:06, Sugarloaf]

(5554) Keesey (Finished)		[Add new note]
·	This new target done, closed for the Survey. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2023-07-10 13:08, Ondrejov]



·	Starting a third night on this one. RUss [2022-09-30 02:10, Shed of Science]

(2227) OttoStruve (Finished) - prime suspect		[Add new note]
·	Done in 2nd apparition. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2023-07-10 11:51, Ondrejov]



·	Covering this tonight. [2022-11-29 03:01, Shed of Science]

·	Following this one again tonight. Russ [2022-11-27 22:39, Shed of Science]

·	Follwed last night on 11/27. I will likely follow again on 11/28. Russ [2022-11-27 16:37, Shed of Science]

·	Got one night on this. Will continue to follow. [2022-10-29 14:21, Shed of Science]



·	Vladimir Benishek observed this new target from Sopot: Unique solution, good coverage, no deviation. http://www.asu.cas.cz/~asteroid/02227.png Target closed. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Good fast work, Vladimir. Petr [2020-01-09 08:36, Ondrejov]

·	Started this new target tonight. Vladimir [2020-01-05 22:16, Sopot AO]

(2653) Principia (Finished)		[Add new note]
·	Done in the 2nd apparition. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2023-06-30 11:06, Ondrejov]

·	Did a run on this last night 1/26 UT. Will cover again tonight. Russ [2023-01-27 02:20, Shed of Science]



·	This new target was observed by Don Pray from Sugarloaf Mountain and by Julian Oey from Leura: Unique solution, good coverage, no significant deviation. http://www.asu.cas.cz/~asteroid/02653.png Object closed for the Survey. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2019-01-07 09:16, Ondrejov]

·	data to be combined with Don's. No attenuation noted. Data sent in [2018-12-30 21:38, Blue Mountains Obs]

·	started new target [2018-12-30 07:23, Blue Mountains Obs]

(1523) Pieksamaki (Finished)		[Add new note]
·	Done in 2nd apparition. https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2023-06-28 11:46, Ondrejov]

·	Did a run on this on 1/26 UT. Will also cover tonight. Russ [2023-01-27 02:05, Shed of Science]



·	Don has done this one well from Carbuncle Hill with four long sessions during 12-22.3 to 28.3. Period of 5.320 h (U=3), doubly covered, no deviation seen. A note on it put to http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Nice work, Don. Cheers, Petr [2006-01-02 12:15, Ondrejov]

·	Attempting third session on this tonight. Looks like 5.3h period. Hopefully, this run will finish it. Don [2005-12-24 04:33, CarbuncleHill]

(21526) Mirano (Finished) - prime suspect		[Add new note]
·	This new target was done in its 1st apparition: https://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2023-06-12 13:24, Ondrejov]

(2966) Korsunia (Finished) - binary		[Add new note]
·	Our report on this one has appeared on CBET 5269, copied below for your convenience. Cheers, Petr (2966) KORSUNIA V. Benishek, Belgrade Astronomical Observatory; P. Pravec and P. Kusnirak, Ondrejov Observatory; F. Vachier, Observatoire de Paris; and A. Klotz, P. Thierry, and J. Berthier, Observatoire des Makes, Reunion, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia and a 0.6-m telescope at the Observatoire des Makes during Apr. 20-May 23 reveal that minor planet (2966) is a binary system with an orbital period of 17.521 Â± 0.004 hr. The primary shows a period of 2.31419 Â± 0.00007 hr and has a lightcurve amplitude of 0.12 mag at solar phases 6-21 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.06 magnitude deep indicate a secondary-to-primary mean-diameter ratio of 0.24. 2023 June 6 (CBET 5269) Daniel W. E. Green [2023-06-07 07:14, Ondrejov]

·	Vladimir Benishek has taken more observations from Sopot for this one. Current preferred solution: https://www.asu.cas.cz/~asteroid/02966_2023a_porb.png https://www.asu.cas.cz/~asteroid/02966_2023a_p1.png (One session, 2023-04-21.9, shows a shallower event than the two later sessions 2023-04-26.9 and 29.9. It may be an observational issue for the sub-optimal observing conditions at Sopot on that night, or it may be a real evolution of the mutual event. More data should show.) More observations (errors < 0.02 mag) are needed to improve the solution. Event ephemeris for the preferred solution: Date/Time UTC (LTc.) Phase -------------------------- 2023- 5- 9 0.54 0.257 2023- 5- 9 18.04 0.257 2023- 5-10 11.54 0.257 2023- 5-11 5.04 0.257 2023- 5-11 22.54 0.257 2023- 5-12 16.04 0.257 2023- 5-13 9.54 0.257 2023- 5-14 3.04 0.257 2023- 5-14 20.54 0.257 2023- 5-15 14.04 0.257 2023- 5-16 7.54 0.257 2023- 5-17 1.04 0.257 2023- 5-17 18.54 0.257 2023- 5-18 12.04 0.257 2023- 5-19 5.54 0.257 2023- 5-19 23.04 0.257 2023- 5-20 16.54 0.257 2023- 5-21 10.04 0.257 2023- 5-22 3.54 0.257 2023- 5-22 21.04 0.257 2023- 5-23 14.54 0.257 2023- 5-24 8.04 0.257 2023- 5-25 1.54 0.257 2023- 5-25 19.04 0.257 2023- 5-26 12.54 0.257 2023- 5-27 6.04 0.257 Date/Time UTC (LTc.) Phase -------------------------- 2023- 5- 9 9.16 0.750 2023- 5-10 2.66 0.750 2023- 5-10 20.16 0.750 2023- 5-11 13.66 0.750 2023- 5-12 7.16 0.750 2023- 5-13 0.66 0.750 2023- 5-13 18.16 0.750 2023- 5-14 11.66 0.750 2023- 5-15 5.16 0.750 2023- 5-15 22.66 0.750 2023- 5-16 16.16 0.750 2023- 5-17 9.66 0.750 2023- 5-18 3.16 0.750 2023- 5-18 20.66 0.750 2023- 5-19 14.16 0.750 2023- 5-20 7.66 0.750 2023- 5-21 1.16 0.750 2023- 5-21 18.66 0.750 2023- 5-22 12.16 0.750 2023- 5-23 5.66 0.750 2023- 5-23 23.16 0.750 2023- 5-24 16.66 0.750 2023- 5-25 10.16 0.750 2023- 5-26 3.66 0.750 2023- 5-26 21.16 0.750 Clear Skies, Petr [2023-05-03 07:47, Ondrejov]

·	Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. There are several possible values for its orbital period; one of them: https://www.asu.cas.cz/~asteroid/02966_2023a_porb.png https://www.asu.cas.cz/~asteroid/02966_2023a_p1.png More data (errors < 0.02 mag) are needed to nail down it. Clear Skies, Petr [2023-04-25 06:56, Ondrejov]

(1990) Pilcher (Finished) - binary		[Add new note]
·	Our report on this one has appeared on CBET 5244, copied below for your convenience. Cheers, Petr (1990) PILCHER V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; M. Husarik, A. Voitko, D. Tomko, M. Pikler, and G. Cervak, Skalnate Pleso Observatory; and A. Marchini and R. Papini, Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of Siena, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.35-m telescope at the Organ Mesa Observatory, 0.61-m and 1.3-m telescopes at the Skalnate Pleso Observatory, and a 0.30-m telescope at the Astronomical Observatory of the University of Siena during 2022 Dec. 29-2023 Feb. 20 reveal that minor planet (1990) is a binary system with an orbital period of 17.146 Â± 0.002 hr. The primary shows a period of 2.84096 Â± 0.00007 hr and has a lightcurve amplitude of 0.11 mag at solar phases 3-9 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.05 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.22. 2023 April 22 (CBET 5244) Daniel W. E. Green [2023-04-24 12:49, Ondrejov]

·	Our current data for this one: https://www.asu.cas.cz/~asteroid/01990_2023a_porb.png https://www.asu.cas.cz/~asteroid/01990_2023a_p1.png https://www.asu.cas.cz/~asteroid/01990_2023b_porb.png https://www.asu.cas.cz/~asteroid/01990_2023b_p1.png https://www.asu.cas.cz/~asteroid/01990_2023c_porb.png https://www.asu.cas.cz/~asteroid/01990_2023c_p1.png Taking more good data (errors < 0.015 mag) would be good before we publish this one on CBET. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2023- 3-10 15.32 0.243 2023- 3-11 8.46 0.243 2023- 3-12 1.61 0.243 2023- 3-12 18.75 0.243 2023- 3-13 11.90 0.243 2023- 3-14 5.04 0.243 2023- 3-14 22.19 0.243 2023- 3-15 15.33 0.243 2023- 3-16 8.48 0.243 2023- 3-17 1.62 0.243 2023- 3-17 18.77 0.243 2023- 3-18 11.91 0.243 2023- 3-19 5.06 0.243 2023- 3-19 22.20 0.243 2023- 3-20 15.35 0.243 2023- 3-21 8.49 0.243 2023- 3-22 1.64 0.243 2023- 3-22 18.78 0.243 2023- 3-23 11.93 0.243 2023- 3-24 5.07 0.243 2023- 3-24 22.22 0.243 2023- 3-25 15.36 0.243 2023- 3-26 8.51 0.243 2023- 3-27 1.65 0.243 Date/Time UTC (LTc.) Phase -------------------------- 2023- 3-10 23.88 0.743 2023- 3-11 17.03 0.743 2023- 3-12 10.17 0.743 2023- 3-13 3.32 0.743 2023- 3-13 20.46 0.743 2023- 3-14 13.61 0.743 2023- 3-15 6.75 0.743 2023- 3-15 23.90 0.743 2023- 3-16 17.04 0.743 2023- 3-17 10.19 0.743 2023- 3-18 3.33 0.743 2023- 3-18 20.48 0.743 2023- 3-19 13.62 0.743 2023- 3-20 6.77 0.743 2023- 3-20 23.91 0.743 2023- 3-21 17.06 0.743 2023- 3-22 10.20 0.743 2023- 3-23 3.35 0.743 2023- 3-23 20.49 0.743 2023- 3-24 13.64 0.743 2023- 3-25 6.78 0.743 2023- 3-25 23.93 0.743 2023- 3-26 17.07 0.743 2023- 3-27 10.22 0.743 Clear Skies, Petr [2023-03-07 10:05, Ondrejov]

·	Our current data for this one: https://www.asu.cas.cz/~asteroid/01990_2023a_porb.png https://www.asu.cas.cz/~asteroid/01990_2023a_p1.png https://www.asu.cas.cz/~asteroid/01990_2023b_porb.png https://www.asu.cas.cz/~asteroid/01990_2023b_p1.png The lightcurve is evolving and it would be good to take more data (errors < 0.015 mag) so that we see how it develops. Event ephemeris: Date/Time UTC (LTc.) Phase -------------------------- 2023- 2- 9 8.36 0.242 2023- 2-10 1.50 0.242 2023- 2-10 18.65 0.242 2023- 2-11 11.79 0.242 2023- 2-12 4.94 0.242 2023- 2-12 22.08 0.242 2023- 2-13 15.23 0.242 2023- 2-14 8.37 0.242 2023- 2-15 1.52 0.242 2023- 2-15 18.66 0.242 2023- 2-16 11.81 0.242 2023- 2-17 4.95 0.242 2023- 2-17 22.10 0.242 2023- 2-18 15.24 0.242 2023- 2-19 8.39 0.242 2023- 2-20 1.53 0.242 2023- 2-20 18.68 0.242 2023- 2-21 11.82 0.242 2023- 2-22 4.97 0.242 2023- 2-22 22.11 0.242 2023- 2-23 15.26 0.242 2023- 2-24 8.40 0.242 2023- 2-25 1.55 0.242 2023- 2-25 18.69 0.242 2023- 2-26 11.84 0.242 2023- 2-27 4.98 0.242 2023- 2-27 22.13 0.242 Date/Time UTC (LTc.) Phase -------------------------- 2023- 2- 9 16.97 0.745 2023- 2-10 10.12 0.745 2023- 2-11 3.26 0.745 2023- 2-11 20.41 0.745 2023- 2-12 13.55 0.745 2023- 2-13 6.70 0.745 2023- 2-13 23.84 0.745 2023- 2-14 16.99 0.745 2023- 2-15 10.13 0.745 2023- 2-16 3.28 0.745 2023- 2-16 20.42 0.745 2023- 2-17 13.57 0.745 2023- 2-18 6.71 0.745 2023- 2-18 23.86 0.745 2023- 2-19 17.00 0.745 2023- 2-20 10.15 0.745 2023- 2-21 3.29 0.745 2023- 2-21 20.44 0.745 2023- 2-22 13.58 0.745 2023- 2-23 6.73 0.745 2023- 2-23 23.87 0.745 2023- 2-24 17.02 0.745 2023- 2-25 10.16 0.745 2023- 2-26 3.31 0.745 2023- 2-26 20.45 0.745 2023- 2-27 13.60 0.745 Clear Skies, Petr [2023-02-02 11:57, Ondrejov]

·	New data for this one taken by Marek Husarik from Skalnate Pleso and by Alessandro Marchini and Riccardo Papini from University of Siena. Likely solution: https://www.asu.cas.cz/~asteroid/01990_2023a_porb.png https://www.asu.cas.cz/~asteroid/01990_2023a_p1.png More data (errors < 0.015 mag) are needed to nail down it. Date/Time UTC (LTc.) Phase -------------------------- 2023- 1-16 18.49 0.244 2023- 1-17 11.63 0.244 2023- 1-18 4.77 0.244 2023- 1-18 21.91 0.244 2023- 1-19 15.05 0.244 2023- 1-20 8.19 0.244 2023- 1-21 1.33 0.244 2023- 1-21 18.47 0.244 2023- 1-22 11.61 0.244 2023- 1-23 4.75 0.244 2023- 1-23 21.89 0.244 2023- 1-24 15.03 0.244 2023- 1-25 8.17 0.244 2023- 1-26 1.31 0.244 2023- 1-26 18.45 0.244 2023- 1-27 11.59 0.244 2023- 1-28 4.73 0.244 2023- 1-28 21.87 0.244 2023- 1-29 15.01 0.244 2023- 1-30 8.15 0.244 2023- 1-31 1.29 0.244 2023- 1-31 18.43 0.244 Date/Time UTC (LTc.) Phase -------------------------- 2023- 1-17 3.07 0.745 2023- 1-17 20.21 0.745 2023- 1-18 13.35 0.745 2023- 1-19 6.49 0.745 2023- 1-19 23.63 0.745 2023- 1-20 16.77 0.745 2023- 1-21 9.91 0.745 2023- 1-22 3.05 0.745 2023- 1-22 20.19 0.745 2023- 1-23 13.33 0.745 2023- 1-24 6.47 0.745 2023- 1-24 23.61 0.745 2023- 1-25 16.75 0.745 2023- 1-26 9.89 0.745 2023- 1-27 3.03 0.745 2023- 1-27 20.17 0.745 2023- 1-28 13.31 0.745 2023- 1-29 6.45 0.745 2023- 1-29 23.59 0.745 2023- 1-30 16.73 0.745 2023- 1-31 9.87 0.745 Clear Skies, Petr [2023-01-16 08:26, Ondrejov]

·	Vladimir Benishek has observed this off-list target from Sopot, found it to be a binary suspect. A tentative lc decomposition: https://www.asu.cas.cz/~asteroid/01990_2023a_porb.png https://www.asu.cas.cz/~asteroid/01990_2023a_p1.png More data (errors < 0.015 mag) are needed to establish it well. Happy New Year! Petr [2023-01-02 15:09, Ondrejov]

(2827) Vellamo - Prime Suspect		[Add new note] [Send data to: peter@asu.cas.cz ]
·	Doing a run on this tonight, Mar 20 UT. Don [2023-03-20 00:03, Sugarloaf]



·	This returned "prime suspect" was observed by Russ Durkee from Shed of Science South, supported with one session by Vladimir Benishek from Sopot. Good solution and coverage, no significant deviation. http://www.asu.cas.cz/~asteroid/02827_c1.png Target closed. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2021-12-14 11:20, Ondrejov]

·	Doing one more night on this one. Russ [2021-11-12 02:21, Shed of Science]

·	Did a run on this one last night. Will do another tonight. Russ [2021-10-30 01:11, Shed of Science]



·	Russ Durkee observed this return "prime suspect": Unique period, acceptable coverage, no significant deviation. http://www.asu.cas.cz/~asteroid/02827_b9.png Target closed. http://www.asu.cas.cz/~asteroid/binastphotsurvey.htm Petr [2019-01-11 14:35, Ondrejov]

·	Will start about 3UT and run until 9UT on 1/5 Russ [2019-01-04 22:22, Shed of Science]

·	Starting at 3:00 UT 1/1/19 run until about 9UT. Russ [2019-01-01 03:06, Shed of Science]

(97034) 1999 UK7 (Finished) - binary		[Add new note]
·	Our report on this one has appeared on CBET 5232, copied below for your convenience. Cheers, Petr (97034) 1999 UK_7 V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; and A. Marchini and R. Papini, Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of Siena, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia and a 0.30-m telescope at the Astronomical Observatory of the University of Siena during Feb. 15-23 reveal that the Mars-crossing minor planet (97034) is a binary system with an orbital period of 15.57 Â± 0.03 hr. The primary shows a period of 2.3757 Â± 0.0005 hr and has a lightcurve amplitude of 0.06 mag at solar phases 14-20 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.06 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.24. 2023 March 12 (CBET 5232) Daniel W. E. Green [2023-03-13 08:46, Ondrejov]

·	Vladimir Benishek has observed this new target from Sopot on 4 nights, found it to be a binary suspect. A tentative lc decomposition: https://www.asu.cas.cz/~asteroid/97034_2023a_porb.png https://www.asu.cas.cz/~asteroid/97034_2023a_p1.png More data (errors < 0.015 mag) are needed to establish it well. Clear Skies, Petr [2023-02-20 09:06, Ondrejov]

·	Worked this new target on 3 nights. Vladimir [2023-02-18 00:15, Sopot AO]

(118303) 1998 UG (Finished) - binary		[Add new note]
·	Our report on this one has appeared on CBET 5223, copied below for your convenience. Cheers, Petr (118303) 1998 UG V. Benishek, Belgrade Astronomical Observatory; and P. Pravec, Ondrejov Observatory, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia during 2022 Nov. 29-2023 Jan. 2 reveal that minor planet (118303) is a binary system with an orbital period of 35.69 Â± 0.04 hr. The primary shows a period of 3.3545 Â± 0.0003 hr and has a lightcurve amplitude of 0.11 mag at solar phases 15-16 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.08 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.28. 2023 February 20 (CBET 5223) Daniel W. E. Green [2023-02-22 09:08, Ondrejov]

·	More data taken by Vladimir Benishek for this one. A likely solution: https://www.asu.cas.cz/~asteroid/118303_2022b_porb.png https://www.asu.cas.cz/~asteroid/118303_2022b_p1.png https://www.asu.cas.cz/~asteroid/118303_2022a_porb.png https://www.asu.cas.cz/~asteroid/118303_2022a_p1.png More data (errors < 0.02 mag) are needed to nail it down. Event ephemeris for the likely solution (but don't limit your observations just around the predicted mid-event times): Date/Time UTC (LTc.) Phase -------------------------- 2023- 1-10 19.95 0.251 2023- 1-12 7.65 0.251 2023- 1-13 19.35 0.251 2023- 1-15 7.05 0.251 2023- 1-16 18.75 0.251 2023- 1-18 6.45 0.251 2023- 1-19 18.15 0.251 2023- 1-21 5.85 0.251 2023- 1-22 17.55 0.251 2023- 1-24 5.25 0.251 2023- 1-25 16.95 0.251 2023- 1-27 4.65 0.251 2023- 1-28 16.35 0.251 Date/Time UTC (LTc.) Phase -------------------------- 2023- 1-10 2.08 0.751 2023- 1-11 13.78 0.751 2023- 1-13 1.48 0.751 2023- 1-14 13.18 0.751 2023- 1-16 0.88 0.751 2023- 1-17 12.58 0.751 2023- 1-19 0.28 0.751 2023- 1-20 11.98 0.751 2023- 1-21 23.68 0.751 2023- 1-23 11.38 0.751 2023- 1-24 23.08 0.751 2023- 1-26 10.78 0.751 2023- 1-27 22.48 0.751 Clear Skies, Petr [2023-01-05 14:08, Ondrejov]

·	Vladimir Benishek has observed this new target from Sopot on four nights, found it to be a binary suspect. A tentative lc decomposition: https://www.asu.cas.cz/~asteroid/118303_2022a_porb.png https://www.asu.cas.cz/~asteroid/118303_2022a_p1.png (Note: The period in the porb plot above was set just for the plotting purpose. There is no real solution for P_orb yet.) More observations (errors < 0.02 mag) are needed to confirm it. Vladimir would appreciate a help by others, as the weather on his station is mostly poor these nights. Clear Skies, Petr [2022-12-15 12:35, Ondrejov]

(1857) Parchomenko - binary candidate, more data needed		[Add new note] [Send data to: peter@asu.cas.cz ]
·	Vladimir Benishek has observed this binary candidate (Stephens et al. 2006) from Sopot on 10 nights in its current apparition so far, catched apparent events. A tentative decomposition: https://www.asu.cas.cz/~asteroid/01857_2023a_porb.png https://www.asu.cas.cz/~asteroid/01857_2023a_p1.png https://www.asu.cas.cz/~asteroid/01857_2023b_porb.png https://www.asu.cas.cz/~asteroid/01857_2023b_p1.png (Note: The period in the porb plots above was set just for plotting purpose. No meaningful P_orb has been estimated yet.) Vladimir would appreciate a help with this one. Data with errors not greater than 0.015 mag are needed; don't bother in less ideal conditions. Clear Skies, Petr [2023-02-16 11:51, Ondrejov]