RE: TJM obs of 2003 Apr 25 UTC; IGS 1A and IB elements - EARLY!

From: Ted Molczan (molczan@rogers.com)
Date: Sat Apr 26 2003 - 05:51:18 EDT

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    Björn Gimle wrote:
    
    > Missed pasting the splits!
    > 
    > 2000.
    > "03-09A","20:01:57.0",13.290,55.13,2
    > "03-09A","20:02:27.8",14.703,82.58,2
    > "03-09A","20:03:10.3",13.290,55.13,2
    > "03-09A","20:03:40.7",00.615,60.32,2
    
    This turns out not to have been IGS 1A. The first point is close to:
    
    ADEOS 2 r       11.0  4.0  0.0  4.5 d
    1 27601U 02056E   03113.72447178  .00000084  00000-0  48014-4 0   407
    2 27601  98.7092 188.3296 0074354  42.1562 318.5296 14.30251114 18682
    
    The remaining points are not as close, but they are not IGS 1A, which passed a
    couple of minutes later. Daniel Deak subsequently observed it running a bit
    early.
    
    > 1B was about time predicted, but again I can't make the splits fit.
    > "03-09B","20:59:45.9",07.807,26.22,2
    > "03-09B","21:00:15.4",06.859,33.37,2
    > "03-09B","21:00:40.5",06.000,37.27,2
    
    The second and third of these points are a good fit to IGS 1B, and I used them
    to update the orbit:
    
    http://satobs.org/seesat/Apr-2003/0293.html
    
    The first point is off by and 1 s and half a degree. This alternate version is
    no better:
    
    > "03-09B","20:59:45.9",08.139,24.02,2
    
    Ted Molczan
    
    
    
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