91082A elements; XSS-11

From: Ted Molczan (molczanseesat@rogers.com)
Date: Sat Nov 25 2006 - 07:22:10 EST

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    XSS-11 (05011A / 28636) rendezvoused with DMSP B5D2-6 (91082A / 21798) several
    months ago, and was tracked for a time by hobbyists. These are the latest
    elements from that effort:
    
    XSS-11           1.0  0.6  0.0  7.5 v 1.20
    1 28636U 05011A   06264.71093735  .00000020  00000-0  10212-4 0    00
    2 28636  98.6413 271.9456 0012000 346.9744  13.0255 14.15656644    00
    
    XSS-11 subsequently manoeuvred away; however, I suspected that it would
    eventually re-rendezvous with 91082A, and Brad Young's observations of 2006 Nov
    21 appear to confirm this:
    
    http://satobs.org/seesat/Nov-2006/0204.html
    
    Brad observed it trailing 91082A by about 15 s. I suspect that XSS-11 may still
    be in the vicinity of 91082A, perhaps leading or trailing by up to 2 minutes
    (time).
    
    Paul Gabriel reported obs of XSS-11 on 2006 Nov 24 and 25, but I find that he
    mistook 91082A for XSS-11 - a common problem, given the often close proximity of
    the objects.
    
    I used Paul's observations to update the orbit of 91082A:
    
    DMSP B5D2-6      6.4  1.7  0.0  6.6 v 5.43
    1 21798U 91082A   06329.02803094  .00000047  00000-0  24121-4 0    01
    2 21798  98.6360 334.2635 0013252 155.8616 204.3182 14.15665844    06
    Arc 2006 Oct 31.72 - Nov 25.03, WRMS residuals = 0.017 deg
    
    I looked for XSS-11 last night, but saw only 91082A, and obtained one
    observation of too low accuracy to contribute to improving or maintaining the
    orbital elements:
    
    21798 91 082A   2701 G 20061124231019930 17 25 1959180+194780 98  
    
    IOD format: http://www.satobs.org/position/IODformat.html
    
    Site 2701: 43.68764 N, 79.39243 W, 230 m
    
    Ted Molczan
    
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