USA 129, XSS-11 r and Lacrosse 5 elements

From: Ted Molczan (seesat@rogers.com)
Date: Sun Oct 30 2005 - 11:47:18 EST

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    Tony Beresford's observations enabled me to improve the mean motion of USA 129's
    post-reboost elements:
    
    USA 129         15.0  3.0  0.0  5.3 v
    1 24680U 96072A   05303.50099692  .00011300  00000-0  15000-3 0    02
    2 24680  97.9602   5.0557 0524837  82.7029 283.3501 14.73691117    06
    
    Russell Eberst has made the first binocular observation of XSS-11's Minotaur
    upper stage rocket, running about 11 s late relative two month old elements.
    
    The following elements cover different arcs, using Greg Roberts' observations in
    June and August:
    
    XSS-11 r         1.3  1.1  0.0  7.6 v
    1 28637U 05011B   05302.21467809 -.00000039  00000-0 -21701-4 0    02
    2 28637  98.8526 292.9957 0013217 336.5194  23.5372 14.11038044    02
    Arc 2005 Aug 29.72 - Oct 29.24, WRMS residuals = 0.022 deg
    
    1 28637U 05011B   05302.21466164 -.00000007  00000-0 -40897-5 0    08
    2 28637  98.8465 293.0007 0010360 314.7464  45.2863 14.11040131    02
    Arc 2005 Jun 21.73 - Oct 29.24, WRMS residuals = 0.017 deg
    
    The negative decay terms probably are due to solar gravity perturbations.
    
    Scott Campbell has made a nice contribution to the Lacrosse 5 post-manoeuvre
    arc. Additional tracking is required to be certain, but it does appear that
    Lacrosse 5 has established a frozen orbit, like those of its predecessors:
    
    Lacrosse 5       0.0  0.0  0.0  2.9 v
    1 28646U 05016A   05303.03164765  .00000042  00000-0  10000-4 0    05
    2 28646  57.0113 167.8565 0011781  96.4369 263.7986 14.53347941    00
    Arc 2005 Oct 15.81 - 30.16, WRMS residuals = 0.026 deg
    
    The 57 deg inclination Lacrosse frozen orbit results in the argument of perigee
    remaining near 90 deg. The 68 deg Lacrosses have argument of perigee near 270
    deg.
    
    Ted Molczan
    
    
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