IMAGE Obs, 15 Oct 2000

From: Ron Lee (ronlee@pcisys.net)
Date: Sun Oct 15 2000 - 09:49:40 PDT

  • Next message: Ron Lee: "GLONASS Obs, 14-15 Oct 2000"

    Observed IMAGE, #26113, from Falcon, CO USA in my 8" telescope
    starting about 04:58 UT, 15 Oct 2000.  Observed for about seven
    minutes.  Range at first sighting around 25840 km and magnitude
    around 11.  Skymap phase angle 167.5.  Standard magnitude about
    5.
    
    I timed numerous flashes over about 6.5 minutes to yield a period
    of 15.3 seconds.  Partway through, I noted that occasional
    flashes were sharp as opposed to others that were more gradual.
    
    I did not determine if there was a set pattern to the sharp flashes.
    I would assume that if observed again that the sharp flash might
    occur every minute.  Knowing if the true rotation rate is one minute
    or 30 or 15 seconds would be helpful.
    
    Because of problems with moonlight, it was difficult following IMAGE
    so some flashes may have been missed.  My data suggests no missing
    flash on any 15 second point but a better observing session is needed
    to confirm this.
    
    My preliminary analysis is that all four solar arrays are still attached.
    It is possible that the sharp flash might be coming from the detached
    array.  Again, further help from the spacecraft operator is desirable.
    
    For example, are there any other surfaces that might reflect enough
    sunlight to substitute for a detached/missing solar array?
    
    PPAS Input:
    
    00- 17 A 00-10-15 05:04     RGL 382.5 1.0  25  15.3
    
    Ron Lee
    
    PS.  Just because perigee is in the southern hemisphere, don't count out
    the observers with positive latitudes.    :) 
    
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