RE: Did Lacrosse 5 maneuver?

From: Ted Molczan (seesat@rogers.com)
Date: Sat Mar 04 2006 - 11:13:58 EST

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    Scott Campbell asked:
    
    > Lacrosse 5 
    > 1 28646U 05016A   06063.08279891 -.00000020  00000-0 -47410-5 0    05
    > 2 28646  57.0078  60.1673 0013305 345.2020  14.8214 14.53345426    03
    
    Apparently so. Using all 10 points reported over a one day arc that ended last
    night, I obtained the following:
    
    Lacrosse 5      15.0  4.0  0.0  2.5 v
    1 28646U 05016A   06063.08280542 -.00000078  00000-0 -18589-4 0    07
    2 28646  57.0077  60.1673 0012082 348.6097  11.4641 14.53345170    07
    Arc 2006 Mar 03.06 - 04.09, WRMS residuals = 0.014 deg
    
    I allowed all elements to vary, except for decay, which I retained from my
    previous solution. Here is another version, this time with inclination fixed at
    the value of the previous elset:
    
    1 28646U 05016A   06063.08280654 -.00000078  00000-0 -18589-4 0    01
    2 28646  57.0134  60.1752 0012472 347.3921  12.6779 14.53345552    03
    Arc 2006 Mar 03.06 - 04.09, WRMS residuals = 0.014 deg
    
    In both cases, the main changes relative the previous elements, are an apparent
    increase in mean eccentricity, and a reduction in argument of perigee of nearly
    50 deg. In mid-January, it appeared to manoeuvre to increase its argument of
    perigee by 70 deg, as I reported here:
    
    http://satobs.org/seesat/Feb-2006/0082.html
    
    Ted Molczan
    
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