flashing period of 2005-04 B object 28538

From: alain.figer@club-internet.fr
Date: Sun Apr 29 2012 - 13:25:15 UTC

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    On 15 March 2012, I measured the period of 2005-04 B from 7 consecutive maxima  determined on a series of photos. I derived a period of 11.29s (6 periods).
    On 21 April 2012, using the same photographic method, I found a period of 11.43s (5 periods)
    Although each maximum can be located quite accurately on the satellite's track registered on the photos, the period accuracy is limited by the fact the time of each photo is given at the second only by the clock of my Canon EOS 600D camera. It would need to know the time of each photo at the tenth of second. 
    This problem led to an incertainty up to 0.1 sec (if not more) on the values derived above for the period.
    One of my photos taken on 21 April 2012 (through thin clouds) is shown here :
    Alain Figer
    2.13 E;  48.67 N ; 170 m a.s.l.
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