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

Date: Wed Nov 21 2012 - 15:26:24 UTC

  • Next message: Greg Roberts: "RE: Labelling unknowns"

    . 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
    -------------- next part --------------
    An HTML attachment was scrubbed...
    Seesat-l mailing list

    This archive was generated by hypermail 2b29 : Wed Nov 21 2012 - 15:26:54 UTC