USA 129 post-manoeuvre elements

From: Ted Molczan (molczan@rogers.com)
Date: Fri Mar 19 2004 - 13:46:06 EST

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    Since my earlier post, I have received a number of accurate observations made on
    two consecutive passes, which confirm the manoeuvre, and my speculation that its
    main effect was to increase the inclination by nearly 0.2 deg. Also, the apogee
    has been raised by about 7 km.
    
    Observation arc 2004 Mar 18.85 - 18.92 UTC:
    
    USA 129         15.0  3.0  0.0  5.3 v
    1 24680U 96072A   04078.90726061  .00019764  00000-0  26010-3 0    06
    2 24680  97.9883 140.4603 0532000 184.8784 174.7122 14.72332198    08
    
    WRMS residuals = 0.039 deg
    
    Due to the short arc, I set the eccentricity to conform with my assumption that
    the mean perigee distance has remained unchanged at about 284 km relative
    Earth's mean radius of 6371 km. I also froze the B* decay term at its
    pre-manoeuvre value.
    
    The change in inclination was required to correct the perturbing effects of
    solar gravity, which strongly affects sun-synchronous orbits. 
    
    USA 129 last made a significant inclination correction nearly three years ago,
    as apparent in the these pre and post-manoeuvre elsets, about 12 h apart:
    
    1 24680U 96072A   01187.14410790  .00030059  00000-0  38985-3 0    03
    2 24680  97.8231 248.9330 0479823 167.5134 193.8435 14.83663532    05
    
    1 24680U 96072A   01187.64718750  .00025598  00000-0  34897-3 0    05
    2 24680  97.9346 249.4231 0505900 166.6784   0.0000 14.77193155    05
    
    Ted Molczan
    
    
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