Re: slow moving unid video

From: C. Bassa (cgbsat@gmail.com)
Date: Fri May 17 2013 - 21:57:50 UTC

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    Hi Kevin,
    
    >From your video I extracted these IOD measurements:
    99205 13 637A   1775 G 20130517080945710 17 25 1712595-101977 37 S
    99205 13 637A   1775 G 20130517080955002 17 25 1714483-100515 37 S
    99205 13 637A   1775 G 20130517081005044 17 25 1716496-094959 37 S
    99205 13 637A   1775 G 20130517081015088 17 25 1718486-093411 37 S
    99205 13 637A   1775 G 20130517081024799 17 25 1720395-091920 37 S
    99205 13 637A   1775 G 20130517081034342 17 25 1722268-090451 37 S
    
    Obviously the arc is too short to constrain all orbital parameters.
    Assuming a geostationary transfer orbit, setting the mean motion to
    2.285 revs/day and the eccentricity to 0.73, I obtain a sensible value
    for the inclination for a launch from KSC.
    1 99205U          13137.34039382  .00000000  00000-0  00000-0 0    04
    2 99205  21.9006 220.7899 7300000 318.6162  15.1129  2.28500000    04
    
    It is not really feasible to constrain the all orbital parameters
    while keeping the mean motion fixed, which means there are a lot of
    search orbits to fit to your data.
    
    I tried to correlate the orbit with Ted's estimates for the SBIRS GEO
    1 and 2 Centaurs. SBIRS GEO 2 puts the perigee at the right place for
    that launch, but the RA of the ascending node seems off.
    
    Regards,
       Cees
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