90027/USA-179

From: Bob Christy (rdc@zarya.info)
Date: Mon Jun 25 2007 - 08:51:10 EDT

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    I have been out of circulation for a couple of weeks or so but I left my
    tracking equipment operating automatically.
    
    Radio observations indicate that the orbit of USA-179 was adjusted about 2007
    Jun 21, nineteen days after the last notable change.
    
    This manoeuvre was different from any of the significant ones seen in twelve
    months of close tracking. 
    
    The mean motion was INCREASED rather than exhibiting the usual decrease. The
    effect is to increase the eastward component in the geographical longitude drift
    of the Ascending Node.
    
    Any thoughts on this would be appreciated. It is possible that the previous
    adjustment resulted in over-compensation for geographical longitude drift so
    this one brings it back into line.
    
    The current derived value of ndot/2 is .0000121.
    
    Latest plot is here:
    http://www.zarya.info/Results/Daily_switch.htm
    
    The two most recent calculated values for Mean Motion are provisional.
    
    Bob Christy
    Lincoln, UK
    53.2233 deg North
    0.6004 deg West 
    Height 59m
    
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