USA 129 elements

From: Ted Molczan (molczan@home.com)
Date: Mon May 01 2000 - 11:59:59 PDT

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    Pierre Neirinck and I produced the following elements, using observations by
    David Brierley, Russell Eberst, Bjoern Gimle, Mike McCants, Pierre Neirinck,
    Ted Molczan and Peter Wakelin, from 28 to 30 April UTC:
    
    Pierre obtained the following:
    
    USA 129         15.0  3.0  0.0  5.1 v
    1 24680U 96072A   00121.85394300  .00025080  00000-0  32518-3 0  4633
    2 24680  97.8874 185.6441 0526202 133.5287 230.9638 14.73849060    03
    
    I see excellent agreement with his final pre-maneouvre elements,
    
    1 24680U 96072A   00117.84807680  .00033163  00000-0  42040-3 0  4561
    2 24680  97.8890 181.7289 0476051 145.4020 217.7886 14.84899008    08
    
    in that inclination and perigee distance are essentially unchanged (within the
    normal uncertainty of the observations), as would be have been expected after a
    coplanar, apogee-raising maneouvre performed at perigee:
    
    My corresponding elements, produced with Elcor, show a similar relationship to
    one another:
    
    1 24680U 96072A   00121.85395255  .00024713  00000-0  35394-3 0    07
    2 24680  97.8809 185.6419 0517190 134.0843 230.4338 14.73847765    08
    
    1 24680U 96072A   00117.84807680  .00031871  00000-0  42527-3 0    00
    2 24680  97.8916 181.7422 0471326 146.3342 216.8717 14.84895836    01
    
    Both pairs of orbits nearly intersect, within a second or two of the time of
    the manoeuvre, about 21:00:12 UTC on 26 April 2000, within the margin of
    uncertainty due to orbital decay.
    
    I have a few of Pierre's earlier elsets that I have not had time to put into
    SGP4 format, but which I will post later.
    
    Ted Molczan
    
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