TJM obs of 2007 Jun 16 UTC; USA 161 post-manoeuvre elset

From: Ted Molczan (sslmolcz@rogers.com)
Date: Sat Jun 16 2007 - 03:34:52 EDT

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    I received Pierre Neirinck's alert about USA 161's manoeuvre in time to track it
    on two passes:
    
    26934 01 044A   2701 G 20070616043031150 17 25 2219562+284467 28 S
    26934 01 044A   2701 G 20070616043120610 17 25 2252856+375973 18 S
    26934 01 044A   2701 G 20070616043142960 17 25 2311109+415338 27 S
    26934 01 044A   2701 G 20070616043211460 17 25 2337794+461893 87 S
    26934 01 044A   2701 G 20070616043237610 17 25 0005430+494530 57 S
    26934 01 044A   2701 G 20070616043356150 17 25 0139855+554090 47 S
    26934 01 044A   2701 G 20070616060611550 17 25 1648851+191414 18 S
    
    IOD format: http://www.satobs.org/position/IODformat.html
    
    Site 2701: 43.68764 N, 79.39243 W, 230 m
    
    Preliminary elements:
    
    USA 161         15.0  4.0  0.0  5.2 v
    1 26934U 01044A   07167.31355407  .00003142  00000-0  63744-4 0    03
    2 26934  97.8702 278.8178 0452800 210.2280 147.2096 14.80029158    01
    
    WRMS residuals are about 0.01 deg, but the arc is short. When Pierre's positions
    become available, I suspect the mean motion will be revealed to be closer to
    14.803.
    
    So, instead of decreasing USA 186's (05042A / 28888) mean motion by about 0.01
    rev/d, USA 161's mean motion was increased by about the same amount, which has
    the same net effect on the time difference between their ascending nodes.
    
    It manoeuvred on 2007 Jun 14, near 15:56:30 UTC.
    
    Ted Molczan
    
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