Re: Geometry for flashes from DSP USA 39

From: Michael McCants (mmccants@jump.net)
Date: Wed Mar 26 2003 - 16:38:53 EST

  • Next message: Tony Beresford: "Re: Geometry for flashes from DSP USA 39"

    I posted:
    
    >Rainer reported that he observed bright flashes from this object
    >at 22:50 for only two minutes.  The RA at 22:50 on March 21 is
    >about 11 Hrs 15 Mn.  This gives a sun-satellite-earth angle of
    >about 170 degrees and a half angle of about 85 degrees.
    
    Of course this should read:  "This gives a sun-satellite-earth
    angle of about 10 degrees and a half angle of about 5 degrees."
    
    The Earth is about 10 degrees in radius and the DSP rotates around
    an axis that is pointed towards the Earth so that the Earth is scanned
    once every 10 seconds.  So the center of the instrument should point
    about 5 degrees away from the direction towards the Earth.  It is possible
    to imagine that the instrument is 5 degrees off-axis by looking at the
    pictures carefully.
    
    Mike McCants
    
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