When does the orbiter significantly change its orbit?

From: Walter Nissen (wnissen@tfn.net)
Date: Mon Aug 20 2001 - 16:03:21 PDT

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    Can anyone point to an explanation for the following, particularly how
    one detects the time of the major impulses?  Or provide such an
    explanation?
    
    Thanks very much.
    
    Walter Nissen
    
    ---
    
    http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaS
    SOP/orbit/SHUTTLE/SVPOST.html
    
    IMPULSIVE TIG (GMT)   M50 DVx(FPS)      LVLH DVx(FPS)      DVmag(FPS)
    IMPULSIVE TIG (MET)   M50 DVy(FPS)      LVLH DVy(FPS)      Invar Sph HA
    DT                    M50 DVz(FPS)      LVLH DVz(FPS)      Invar Sph HP
    
    -
    
    232/16:11:26.402           0.5              -6.0              6.0
    009/19:01:12.420          -5.1               0.0              218.9
    000/00:00:24.839           3.0               0.1              205.4
    
    232/20:40:21.863          -3.6             -11.0              11.0
    009/23:30:07.880          -6.3              -0.0              218.5
    000/00:00:15.761           8.2               0.1              199.7
    
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