NOSS 3-4 elements

From: Ted Molczan (sslmolcz@rogers.com)
Date: Tue Jun 19 2007 - 08:55:16 EDT

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    The following are based solely on Scott Campbell's observations of 2007 Jun 18
    and 19 UTC:
    
    NOSS 3-4 (A)     0.0  0.0  0.0  4.9 v
    1 31701U 07027A   07170.06979759  .00000020  00000-0  20000-4 0    06
    2 31701  63.3811  37.1588 0232911 148.8868 212.6203 13.65676455    03
    Arc 2007 Jun 18.15 - 19.10, WRMS residuals = 0.018 deg
    
    NOSS 3-4 (C)     0.0  0.0  0.0  4.9 v
    1 71703U 07027C   07170.06992739  .00000020  00000-0  20000-4 0    05
    2 71703  63.3479  37.1783 0231929 151.1831 210.2249 13.65605473    07
    Arc 2007 Jun 18.15 - 19.10, WRMS residuals = 0.018 deg
    
    Mike, Scott and I have produced nearly identical results, and further tracking
    will not result in large changes to the elements.
    
    These appear to be the main deviations from nominal, resulting from the
    anomalous final Centaur burn:
    
                       Nominal  Achieved
    Perigee, km         1000       842    
    Apogee, km          1200      1186
    Arg Perigee, deg     180       150
    
    It will be interesting to see whether the orbit will be corrected using a few
    large manoeuvres, or many small ones. Detectable impulsive manoeuvres by NOSS
    are very rare, and very small when they do occur, which leads me to suspect that
    their manoeuvring engines are small. Do they carry sufficient propellant to
    achieve the nominal initial orbit? Time will tell.
    
    Ted Molczan
    
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