KH manoeuvred Sep.07 20:36

From: Bjoern Gimle (b_gimle@algonet.se)
Date: Sun Sep 10 2000 - 09:30:46 PDT

  • Next message: Bjoern Gimle: "USA 129 obs"

    > USA 129 fix                                      978 x 288
    > 1 24680U 96072A   00251.77660427  .00033500  00000-0  47323-3 0    18
    > 2 24680  97.8580 313.1267 0492510  72.3635 293.0722 14.78866062   158
    >
    > may be a reasonable orbit, based on the assumption that it manoeuvred
    > on the orbit just before Russell's observation on Sep.7 (about 18:56).
    
    Rob's COLA gives with this, and the last pre-boost elset, a nearest
    approach one orbit later than my initial assumption, 2000/9/7 20:36:35.24
    at only 0.7 km. This is near the perigee, and 5 minutes AFTER Russell's
    observations on Sep.07. The 00253.80533104 elset gives a time of 20:20,
    and a range of 9.4 km
    
    deltaV was only about 2.75 m/s, so an error of only 0.1 s in one of
    the elsets, (changing a position by 792 m) would move the close
    approach time by almost 5 min. On the other hand, if the manoeuvre
    was done at perigee, about 5 min after the obs, using Russell's obs
    for the new orbit only introduces a 0.1 s/day error in time, and
    probably very small in position of the orbit.
    
    -- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
    -- COSPAR 5919, MALMA,    59.2576 N, 18.6172 E, 23 m         --
    -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m         --
    
    
    
    
    
    
    
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