Re: PAS 1R

From: Harald Edens (edens@weather-photography.com)
Date: Tue Apr 02 2002 - 16:28:49 EST

  • Next message: Edward S Light: "Re: PAS 1R"

    23h56m is the approximate siderial rotational period of earth, so this 
    should be correct for geostationary satellites.  A 24-hour period would
    shift the satellite about 4 minutes (or 0.4 deg.) to the west every day.
    The days are just 24 hours long in order to keep the civillians with the
    sun due south near midday every day in the year.
    
    Harald Edens
    
    
    
    ----- Original Message ----- 
    From: "Jonathan T Wojack" <tlj18@juno.com>
    To: <SeeSat-L@satobs.org>
    Sent: Tuesday, April 02, 2002 22:49
    Subject: Re: PAS 1R
    
    
    > > 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?
    > 
    > FWIW, it will return to the same spot over the Earth in 740 days,
    > according to my crude calculations.  More crude calculations reveal that
    > it moves 8 arc-minutes against the stars daily (one degree of arc in 7.5
    > days).
    > 
    > ------------------------------
    > Jonathan T. Wojack                 tlj18@juno.com
    > 39.706d N   75.683d W            5 hours behind UT (-5)         
    > ***DOZENS OF SCIENTIFIC AMERICAN, ASTRONOMY, 
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