Re: Flashing Geo

From: Ed Cannon (ecannon@mail.utexas.edu)
Date: Tue Aug 30 2005 - 03:59:37 EDT

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    Steve LaLumondiere wrote:
    
    >Found:  One geosynchronous satellite that I cannot identify.  
    >Three nights I have seen it, and it appears to be flashing a 
    >few minutes earlier every evening.  Using 16x70s, from So. 
    >Cal. light polluted skies I can observe it for about half an 
    >hour each night.  Last night (actually this morning) it 
    >became visible about 7:10 and I lost it around 7:40 UTC.  
    >The flash period isn't quite regular, with spacings of 42.5 
    >and 45.5 seconds.  Some of the flashes near the midpoint 
    >were at least mag 4.
    
    Steve -- Thanks very much for your report!
    
    Based on the flash behavior and the fact that I get it only 
    about 15 minutes of time off from your positional observation
    for 8/29 UTC, I believe it's the one we call 90007 (00-653A,
    an unknown discovered on June 1, 2000).  It oscillates east
    and west and back, rather than drifting around the Earth.  
    The most recent elset that I have (from Mike McCants' 
    classfd.tle file) is:
    
    Unknown 000601
    1 90007U 00653A   05152.66069363 0.00000000  00000-0  00000-0 0    05
    2 90007   9.2052  50.1897 0049394  46.2897 314.1304  1.00237613    00
    
    I believe that Mike McCants has a program that can generate 
    projected elements for it after it has not been observed for 
    a period of time.  
    
    Ed Cannon - ecannon@mail.utexas.edu - Austin, Texas, USA
    
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