PSABA - Minor Planet Photometry

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PSABA

Photometry > 2018
(21282) Shimizuyuka

The asteroid light curve was measured to be 5.216h
Followed the next month with a longer light curve of 5.276h, a margin of error that is not acceptable.
Attempt to confirm the correct light curve failed due to poor weather condition in the following month, dimming and change viewing geometry to polar aspect causing a considerable reduction in the lightcurve amplitude.
Shortening of the observing session also did not help.
(3865) Lindbloom

The PSABA asteroid has very low amplitude
Its light curve period is not well defined . The period recorded here is U=2
Period estimated at 3.57h
Pravec et al. (2018) found it at 5.42h at U=2
(10450) Girard

Asteroid is found to have a unique period of 4.1979h
(10108) Tomlinson

PSABA target with confirmed binary. Observation is to support the discovery phase
Refer to Discovery page for detail.
(31450)_1999_CU9.PNG
MBA

PSABA
Absolute mag (H): 13.2 mag

Previous work done:
[Warner, B.D. (2016) Minor Planet Bull. 43, 57-65.]
1151 Ithika

PSABA target. the data show some attenuation in the light curve but not confirmed.
July data need to be refined particularly more data points needed for a more refined light curve.
Unable to determine the correct period. Possibly due to double period.
1696 Nurmela

PSABA target at the current 4th apparation of this "primary suspect"
Previously detection of second period is probable.
After multiple sessions, there may be a second period but no event detected. Will continue with observation to try to confine the second period.
(1967) Menzel

Initial attenuation was detected on the 07/22 and 07/21
Further observation show secondary period shown here either P2=106h or double of that of P2=211h
No zero point adjustmet were made.

1967 Menzel

18 Sessions was completed and 8 sessions zero point was forcely adjusted to fit the detected attenuation
Primary period is 2.83478h with amplitude 0.24m
Secondary period is 63h with amplitude of 0.14m

(3382) Cassidy

Data taken over 2 months was instigated by an attenuation earlier in May.
However it was shown that the attenuation was caused by background star subtraction artefact
however the reduction show possible second period of P=47h
4666 Dietz

Previous apparition on 2011 and 2015 did not capture any events. However this is a prime suspect that turned out to show the existence of a second period which indicated a probable binary. This current third apparition where events were captured, confirmed that this asteroid is a binary.

Continuation of observations during June lunation still show the progression of the events evolution.
The current geometry at LPAB 350-0 and BPAB -22
2015 Geometry is LPAB 15 BPAB -22
2011 Geormetry LPAB 340 BPAB -25
Secondary orbital period of 33.1h

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