RE: 01-44A seen

From: Ted Molczan (molczan@rogers.com)
Date: Wed Apr 16 2003 - 21:59:32 EDT

  • Next message: David Brierley: "01-44A seen again."

    David Brierley wrote:
    
    > No sign of 03-9B at 20:50 UT +/-3 mins. [2003 Apr 16]
    
    I suspect it may have manoeuvred to lower its orbit to match 03009A's mean
    motion.
    
    It would have been about 4.5 min early if the manoeuvre occurred at the epoch
    of the latest elements issued by Mike McCants. Here is a search elset based
    upon that idea:
    
    IGS 1B           0.0  0.0  0.0  2.9 v
    1 70000U          03102.85490120  .00005000  00000-0  20167-3 0    09
    2 70000  97.4061 174.9841 0004070 195.2811 164.7187 15.26130000    00
    
    Realistically, the manoeuvre occurred a bit later, so the object should be a
    bit late relative this elset, up to 1.5 min late. My guess is that it now
    trails 03009A by 20 min (a nice round number), in which case it would be in
    this orbit:
    
    IGS 1B           0.0  0.0  0.0  2.9 v
    1 70000U          03105.93722765  .00005000  00000-0  19397-3 0    07
    2 70000  97.4061 178.1071 0007000 243.8992 116.1527 15.26130637    02
    
    which would have made it nearly 4 min earlier than David expected, and nearly
    1 min earlier than he started observing:
    
    I would not be surprised to see frequent small manoeuvres by both satellites
    until the design orbits are achieved. Afterward, periodic manoeuvres would be
    required to maintain the orbits.
    
    Ted Molczan
    
    
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