Updated 09052C elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Mon Feb 15 2010 - 13:22:37 UTC

  • Next message: Tony Beresford: "Satobs feb 15 for 8597"

    Derek Breit, Brad Young, and I, contributed observations used to determine
    the following element set:
    
    STSS Demo r                                              157 X 422 km
    1 35939U 09052C   10046.11442138  .03178161  00000-0  90126-3 0    01
    2 35939  59.6338 285.6632 0199000   7.1677 353.2200 15.94340914    09
    Arc 20100214.13-0215.14 WRMS resid 0.039 totl 0.030 xtrk
    
    Brad's observations between mine and Derek's, generally confirmed the
    earlier solution I posted, but I believe this one may be a bit more
    accurate.
    
    The visibility window now extends from about 30 N to 56 N, which includes
    most of the active observers. The southernmost observers still have limited
    visibility of the orbit, but it will improve somewhat each day. Precession
    is bringing the orbital plane closer, but drag is shaving several tens of
    kilometres from the apogee each day, which slows the rate of improvement of
    the passes.
    
    It would be prudent to allow for at least 60 s early arrival, 24 h after the
    epoch. If observing at high elevation, with a narrow field of view, be sure
    to check for the effect of Earth's rotation on the predicted path, over the
    uncertainty interval. 
    
    When planning observations of objects with a significant time uncertainty,
    it is useful to look for a fence of reasonably closely spaced stars lying
    roughly perpendicular to the track, and spanning the uncertainty in the
    path, thus improving the probability of making at least one accurate
    observation. 
    
    Using Satevo 0.51, I estimate decay no later than early 2010 Feb 19 UTC.
    
    Ted Molczan
    
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