TJM obs of 2008 Nov 28 UTC; updated Lacrosse 2 elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Sat Nov 29 2008 - 01:07:10 UTC

  • Next message: Allen Thomson: "Re: TJM obs of 2008 Nov 28 UTC; updated Lacrosse 2 elements"

    Just prior to my observation of 05016A, I observed without optical aid, ISS and
    STS 126, separated by about 4 deg, on a low pass in the NNW.
    
    Lacrosse 2 was 15 s late relative the latest elements (below), confirming
    Russell Eberst's observation yesterday that it was running late.
    
    Lacrosse 2      18.0  4.5  0.0  3.6 v
    1 21147U 91017A   08329.77017445  .00000050  00000-0  72139-5 0    05
    2 21147  67.9900 210.8587 0004500 277.5806  82.4194 14.76152093    09
    
    Using our two points, I have updated the above elements, correcting only RAAN,
    mean anomaly and motion; residuals are low:
    
    1 21147U 91017A   08333.97130653  .00000050  00000-0  72139-5 0    09
    2 21147  67.9900 199.6257 0004498 273.1067  86.9551 14.76087237    07
    
    Its mean altitude is now about 200 m higher. It raised its orbit about 100 m in
    mid October. One theory is that these manoeuvres are thruster firings to
    desaturate reaction wheels; collision avoidance may be another possibility worth
    studying.
    
    28646 05 016A   2701 G 20081128234103590 17 25 1453974+593023 18 S
    28646 05 016A   2701 G 20081128234121000 17 25 1424897+625617 37 S
    28646 05 016A   2701 G 20081128234224650 17 25 1136047+691996 96 S
    21147 91 017A   2701 G 20081128235048340 17 25 1149891+672338 18 S
    
    IOD format: http://www.satobs.org/position/IODformat.html
    
    Site 2701: 43.68764 N, 79.39243 W, 230 m = 0.015 deg
    
    Ted Molczan
    
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