TRMM non-obs: maneuver or problem elset?

From: Ed Cannon (ecannon@mail.utexas.edu)
Date: Fri Aug 30 2002 - 05:14:17 EDT

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    Last night I had a pretty good pass of TRMM (predicted +3).  I 
    did not see it.  My predictions were based on these elements 
    (due to not having time to download newer ones before doing 
    predictions):
    
    TRMM             5.0  4.0  0.0  3.5 v   15       402 x 399 km
    1 25063U 97074A   02240.35573839 -.00214987  00000-0 -31147-2 0  7634
    2 25063  34.9809 213.6666 0001597 164.6884 195.3535 15.55626603272809
    
    Here are the latest five that I just got from OIG:
    
    TRMM
    1 25063U 97074A   02242.15243024  .00019502  00000-0  27326-3 0  7688
    2 25063  34.9764 201.7973 0001303 238.6092 121.4487 15.55813452273083
    TRMM
    1 25063U 97074A   02241.51080184 -.00066750  00000-0 -94797-3 0  7677
    2 25063  34.9768 206.0405 0000422 115.3552 244.7906 15.55651222272986
    TRMM
    1 25063U 97074A   02241.44660541  .00060744  00000-0  84903-3 0  7651
    2 25063  34.9744 206.4640 0001652 187.8495 172.2706 15.55799096272975
    TRMM
    1 25063U 97074A   02241.18994367 -.00080905  00000-0 -11505-2 0  7647
    2 25063  34.9733 208.1752 0003161 201.6866 158.4268 15.55658783272932
    TRMM
    1 25063U 97074A   02240.93335696 -.00095518 +00000-0 -13600-2 0 07647
    2 25063 034.9706 209.8706 0005103 219.3927 141.2371 15.55666371272893
    
    I guess it maneuvered.  But I wonder if I might have gotten a 
    less-than-reliable elset.  This is something to watch out for
    with TRMM.  It can be a couple of minutes off, even with recent
    elements.
    
    I was able to see some 90907 flashes last night during the last
    several minutes of its pass (maybe 3:59-4:07 UTC).  Weather was
    less than ideal.  I think that Paul maybe happened to look at a 
    time when it was much fainter.  (On the current passes it's 
    brightening as it moves south and lower, towards perigee.)  It 
    runs about 10 minutes earlier each night.  
    
    Last night observed from BCRC site: 30.315N, 97.866W, 280m.
    
    Ed Cannon - ecannon@mail.utexas.edu - Austin, Texas, USA
    
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