Re: Obs Feb 6 & non obs of 22702

From: Mike McCants (mikem@fc.net)
Date: Sun Feb 06 2000 - 11:24:46 PST

  • Next message: Allen Thomson: "Bad data in elsets (was something else)"

    Jim Nix posted:
    
    >Running 4 secs late on:
    >COSMOS 2366
    >1 25892U 99045A   00035.16279445  .00004051  00000-0  42900-2 0  1190
    >2 25892  82.9214  63.4863 0032076 181.5025 178.5925 13.73938238 22192
    
    I thought this seemed unusual, so I checked a few past elsets.
    
    Many elsets back to October have a BStar term of "42900-2".
    This translates to a drag term of .00004051.  But this drag value
    is about 50 times too big.
    
    I found one correct elset:
    
    1 25892U 99045A   00006.68790088  .00000067  00000-0  70755-4 0   885
    2 25892  82.9253  84.5792 0030883 264.5662  95.2571 13.73912558 18287
    
    The elsets with the wrong drag also typically have mean motion values
    that are about 0.000250 larger than the correct value.  This explains
    the 4 second discrepancy that Jim noted, even though his observation
    was only 2 days after the epoch of the elset.
    
    Mike McCants
    
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