Transtage 3 & 4 : two ancient yet still nice short flashers.

From: alain.figer@club-internet.fr
Date: Wed Nov 21 2012 - 15:26:24 UTC

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    . Transtage 3 obj1001 1965-08 A 
    
    . Transtage 4  obj1359 1965-34A
     
    
    Hi all, 
    
     
    
    I determined photographically the photometric period for both flashers through series of photos imaging the complete light curve.
    
     
    
    Transtage 3 : period = 4.31 sec on 13 september 2012
    
    Transtage 4 : period = 3.72 sec on 10 september 2012
    
     
    
    The period of Transtage 4 was easy to derive, as usual, as this satellite is a regular flasher so that it is an ideal target for visual observing.
    
     
    
    However, Transtage 3 is a more delicate case so that I had to observe it twice (on 10 and 13 september) to ascertain  what was happening.
    
     
    
    In fact, a few "maxima" were recorded as much fainter than average, what might be a trouble for deriving the correct period when lacking precise imaging of the whole light curve.
    
     
    
    My value for the photometric period of Transtage 3 was derived for the 13 sep 2012 by a least squares procedure involving 14 successive timings of max, whose 3 of them were anomalously weak. The weaker maximum do repeat every 4 photometric periods, what is every 17.2 seconds.
    
     
    
    It might be possible during visual watching to lack counting a few 'weak maxima';  hence to derive a spurious period expected to be "longer" than real.
    
     
    
    Take care!
    
     
    
    Alain Figer
    
     
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