Essaim 4 E12 discovered by Cees Bassa

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Wed Feb 06 2013 - 14:40:34 UTC

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    Cees Bassa reminded us of an UNID he spotted on two recent nights, suspected to be one of the four Essaim satellites:
    
    http://www.satobs.org/seesat/Feb-2013/0034.html
    
    I found that the propagated disposal orbit of Essaim 4 was closest in plane to both sets of points:
    
    1 78497U 04049F   13004.73350277 0.00000457  00000-0  64045-4 0    06
    2 78497  98.3564  27.7828 0013757  75.8276 284.1548 14.77581571    02
    
    Correcting to fit the observations yields this approximate orbit:
    
    Essaim 4
    1 28497U 04049F   13004.70122319  .00000459  00000-0  64045-4 0    04
    2 28497  98.3853  27.0342 0004584 245.7771 114.2959 14.77793636    04
    
    This TLE probably is currently accurate to within several minutes of time.
    
    Here are the observations with their correct IDs:
    
    28497 04 049F   4553 F 20121215174306325 17 25 0823578+702845 37 I
    28497 04 049F   4553 F 20121215174313604 17 25 0852701+694911 37 I
    28497 04 049F   4553 F 20121215174315284 17 25 0858881+693804 37 I
    28497 04 049F   4553 G 20130104170622042 17 25 0747373+473787 37 I
    28497 04 049F   4553 G 20130104170624342 17 25 0751476+475518 37 I
    
    Ted Molczan
    
    
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