Re: PAS 1R

From: Edward S Light (light@argoscomp.com)
Date: Tue Apr 02 2002 - 16:38:58 EST

  • Next message: Tony Beresford: "Re: PAS 1R"

    Dear Jonathan,
    
    You wrote:
    > > PAS 1R
    > > 1 26608U 00072A   02079.94130788 -.00000274  00000-0  00000+0 0  
    > > 2939
    > > 2 26608   0.0180 354.4991 0000429 321.3661 156.2908  1.00270296  
    > > 4973
    > 
    > Does this geosat intentionally have an orbital period just barely shorter
    > than 24 hours (23 hours 56 minutes 7 seconds), or is its operators
    > satisfied that it is close enough to a 24 hour orbital period?
    > 
    
    The earth rotates once every 23 hours 56 minutes 4 seconds RELATIVE
    TO THE STARS (24 hours 0 minutes 0 seconds, on average, relative to
    the sun). And incidentally, the "1.00270296" revolutions per [24-hour]
    day in the TLE may well include small factors due to perturbations,
    but that is not the major issue here; the true sidereal rotation
    period of the earth is 24 hours / 1.0027379.. .
    
    Clear skies!
    
    Ed Light
    
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