2010 - Minor Planet Photometry

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Obs Code





Time (UT)



150d 20' 30"

-33d 42' 22"





151d 5' 45"

-33d 56' 51"





150d 20' 30"

-33d 42' 22"









SCT 0.25m

G11 Gemini v2





SCT 0.35m

Celestron CGE

7 (GEG)




Light curves of asteroid periods found in 2008.  All period are light time corrected. The criteria for target selection in Kingsgrove observatory were mainly for its favourable opposition brightness and also its southerly location due to local restrictions to the  observatory‚Äôs northern horizon. Observing is useful for photometry in dark sky(moonless) to about 14.5magnitude. Leura observatory limiting magnitude is 17.5magnitude with precision of <0.03m.

Bracket next to Date Range indicate the location and system used. All period are light time corrected. An asterisk (*) after the name indicate published light curve in Minor Planet Bulletin.

PSABA: Photometric Survey of Asynchronous Binary Asteroids. CALL: Collaborative Asteroid Light curve Link

310 Margarita*

Date range:09/03 -15/04 (1)
Period:12.07000h  + 0.00002h
Amplitude:0.16m + 0.01m
H=10.30: G=0.15: Dia=36.6: Albedo=0.100: Class = SC:PA=13.4,1.1,3.8
LPAB=196,197.6: BPAB=-2.6,-2.1

Observation was done in collaboration with Frederick Pilcher in USA. Period was commensurate to earth rotation period. Resultant combined data taken from different geographic longitude will confirm the period. F. Pilcher publish paper in MPB Volume 37 issue 4.

1194 Alleta*

Date range: 08/03 - 19/03 (1)
Period:20.390h + 0.007h
Amplitude:0.28m + 0.03m
H=10.2: G=0.15: Dia=50.33: Albedo=0.058: Class = C :PA=5.4,6.8
LPAB=168.9,169.1: BPAB=-11.8,-12.1

CALL target. Previous result by Brinsfield was 19.8h +/- 0.1h  

1685 Toro*

Date range:20/04 - 10/05(1)
Period: 10.203h + 0.003h
Amplitude: 0.6m + 0.1m
H=14.23: G=0.15: Dia=4.47: Albedo=0.180: Class = S:PA=12.0,7.6,9.0
LPAB=223.4,221.6: BPAB=-11.5,-10.9

CALL target

2501 Lohja*

Date range: 08/06 - 08/08(2)
Period: 3.80886h + 0.00002h
Amplitude: 0.25m + 0.01m
H=12.08: G=0.15: Dia=12.02: Albedo=0.180: Class = S:PA=7.6,28.3
LPAB=246.7,259.6: BPAB=-4.3,-4

PSABA target for binary asteroid prime suspect. D. Higgins published in MPB volume 38 issue 1.

2121 Sevastopol

Data Range: 15/08 - 16/09
P1: 2.74h + 0.01h
P_Orb : 37.1h + 0.1h
Amplitude: 0.20m + 0.03m:H=12.3: G=0.15: Dia=10.86: Albedo=0.180: Class = S
LPAB=357.4,1.7: BPAB=-2.1,-3.6

PSABA binary asteroid. Recently discovered by David Higgins. Announcement in CBET 2427

2897 OleRomer*

Date range: 06/05 - 10/06(2)
Period:2.6004h + 0.0002h
Amplitude: 0.07m + 0.02m
H=13.4: G=0.15: Dia=6.54: Albedo=0.180: Class = S:PA=7.5,0.8,11.1
LPAB=238.1,239.1: BPAB=-0.8,-2.2

PSABA target for asteroid pair.

3704 Gaoshiqi

Date range: 15/07 - 01/09(2)
Period: 9.7730 + 0.0004h
Amplitude : 0.20m + 0.05m
H=12.5: G=0.15: Dia=9.91: Albedo=0.180: Class = S:PA=9.9,4.4, 14.7
LPAB=308.7,310.7: BPAB=7.5,7.9, 7.8

PSABA target. Initial data taken over 1 month indicated a bimodal light curve but showing considerable amount of dispersion.  The deviations are not resolvable at the current available data sets. Future observations will be needed for clarification. 2 final data sets were provided by Joe Pollock confirming the 9.77h period.

3868 Mendoza

Date range: 10/09 - 12/11
Period: 3.0884h + 0.0002h
Amplitude: 0.10m + 0.03m
H=13: G=0.15: Dia=7.87: Albedo=0.180: Class = S:PA=17.1,3.2, 16.4
LPAB=16.4,20.7: BPAB=-3.1,-6.6

PSABA target. Follow up on subsequent apparition since the discovery apparition last year.

4283 Stoffler*

Date range:08/03 - 25/03 (1)
Period: 154.0h + 1.0h
Amplitude:0.8m + 0.1m
H=12.6: G=0.15: Dia=9.46: Albedo=0.180: Class = S:PA=8.1,14
LPAB=167.3,167.9: BPAB=-12.5,-15.6

CALL Target. Different sessions are internally linked.

6961 Ashitaka*

Date range:15/03 - 14/04 (1)
Period:3.1461h + 0.0002h
Amplitude:0.15m + 0.02m
H=13.4: G=0.15: Dia=6.54: Albedo=0.180: Class = S:PA=15.8,2.1, 2.8
LPAB=197.7, 201: BPAB=-4, -2.8

CALL Target

10357 1993 SL3*

Data Range :  11/09 - 17/09
Period: 2.763h + 0.003h
Amplitude: <0.05m
H=12.7: G=0.15: Dia=9.03: Albedo=0.180: Class = S:PA=12
LPAB=353: BPAB=-16

CALL target. Period is not reliable and could be a long period object but not sufficient data for complete derivation of its period.

14133 1998 RJ17*

Data range: 31/12/10 - 29/01/11
Period: 5.24008h + 0.00007h
Amplitude: 1.15m  + 0.02m:H=14.2: G=0.15: Dia=4.53: Albedo=0.180: Class = S
PA=13.1, 9.7, 12.6
LPAB=111.8,114.5: BPAB=-15, -13.5

PSABA target

15430  1998 UR31

Data range: 22/04 - 15/05(2)
Period_1: 2.5272h + 0.0002h
Amplitude: 0.10m + 0.05m
Period_2: 11.980h + 0.004h
H=13.8: G=0.15: Dia=5.44: Albedo=0.180: Class=S:PA=6.9,37, 9.7
LPAB=219.1: BPAB=5.7

PSABA target. Primary rotation period is obtained however the dispersion apparent in the lightcurve is not clearly understood at this stage. Causes ranging from instrumental faults to true nature of the asteroid has yet to be confirmed. I have exhausted all efforts in eliminating causes internally within software reduction. My next attempt is to try other targets with similar physical  characteristic and see for any similar peculiarities. Previous work has not shown such curves.
If correct, the observed light curve consistent with a Porb of about 12h and P_2 of about the same. However confirmation of such period characteristic require coordinated approach from other observers at other longitudes.

29729 1999 BY1

Date range: 01/09-03/09 (1)
Amplitude: 0.70m + 0.05m
Period: 4.5279h + 0.0001h
H= 13.4: G=0.15:Dia=6.54: Albedo=0.180 Class =S:
PA=5.6, 28.0
LPAB=110.4, 116.9

PSABA target worked together with David Higgins from Hunter hills Observatory.

15700 1987 QD

Date range: 25/09 - 27/09
Period: 3.063h + 0.005h
Amplitude: 0.10m + 0.05m
H=14.4: G=0.15: Dia=4.13: Albedo=0.180: Class = S:PA=12
LPAB=347: BPAB=1

PSABA target. Binary Asteroid candidate was not confirmed due to contradictory results. 2 possible binary orbital periods are 50h and 63h. Result published in CBET 2540

131702 2001 YZ3*

Date range: 09/01 - 22/01(1)
Amplitude: 0.10m + 0.05m
Period: 4.92h + 0.01h
H=14.4: G=0.15: Dia=4.13: Albedo=0.180:Class=S:PA=20
LPAB=126: BPAB= -14, -22

Asteroid is in the same field as 29729 1999 BY1. Data was reduced with CSS method in Canopus V10

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