RE: NROL-36 search elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Fri Sep 14 2012 - 15:58:12 UTC

  • Next message: Ted Molczan: "RE: NROL-36 search elements"

    Here are updated search elements, based on observations on 2012 Sep 14, by Bram Dorreman near 03:54 UTC, and Kevin
    Fetter near 09:43 UTC.
    
    For the payload, I adjusted the epoch, RAAN and mean anomaly of my search elements to fit Kevin's observations of the
    trailing object. Residuals are small.
     
    NROL-36
    1 79601U 12048A   12258.39443996  .00000000  00000-0  00000-0 0    06
    2 79601  63.4386  40.5161 0127783 180.8400 179.2429 13.39314612    08
    
    Mean motion remains a guess. Allow at least one minute prediction time uncertainty per 24 h from epoch.
    
    For the Centaur, I adjusted my search elements to fit different combinations and weightings of Bram and Kevin's
    observations. Here are a couple of my results:
    
    NOSS 3-6 r                                               489 X 745 km
    1 79602U 12048B   12258.35461294  .00000000  00000-0  00000-0 0    04
    2 79602  64.3579  38.9166 0183150 290.8120  67.3451 14.83426335    08
    Arc 20120914.16-0914.36 WRMS resid 0.082 totl 0.081 xtrk
    
    NOSS 3-6 r                                               271 X 965 km
    1 79602U 12048B   12258.35465942  .00009242  00000-0  10000-3 0    09
    2 79602  62.8166  37.1792 0496524 304.4012  51.1066 14.83238794    06
    Arc 20120914.16-0914.36 WRMS resid 0.116 totl 0.115 xtrk
    
    The mean motion is fairly accurate, so the uncertainty will be mainly in the track. I suggest using both of the above to
    help bracket searches.
    
    The international designations are subject to change, once we see what the official ones are.
    
    Ted Molczan
    
    
    
    
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