Re: possible fourth Globalstar?

From: Mike McCants (mmccants@io.com)
Date: Wed Jun 06 2007 - 10:31:06 EDT

  • Next message: Brad Young: "RE: possible fourth Globalstar?"

    Ed Cannon posted:
    
    >On the second pass earlier tonight, at about 4:12-15 UTC,
    >Mike and I saw three of the new Globalstars.  A minute or
    >two after the third one another object came along that
    >seemed to be in a very similar track, although it seemed
    >fainter to me than the others, and I didn't come up with
    >a match using Findsat.
    
    The mean motion values for the 5 tles available from space-track are:
    
    13.9217
    13.9189
    13.9160
    13.9142
    13.9141
    
    Nothing was seen at the predicted place for the largest mean motion.
    This is labeled "Fregat Deb" by Spacecom, but it matches the other
    orbits.  It does seem to have a non-zero drag term indicating that
    it is a tiny piece of debris.
    
    Globalstar objects were seen corresponding to 3 of the other 4 orbits.
    The last two orbits were predicted to be only 10 seconds apart.
    Only one object was seen at that time.  These 3 objects would then
    be the ones labeled C, A, and then either D or F by Spacecom.
    
    A fourth object was spotted by Ed about 2 minutes after that last object.
    If the mean motion for this object is assumed to be 13.9120, then I
    can adjust its orbit to fit two observations I made about 04:21 UT:
    
    Globalstar X  
    1 99991U 07020X   07157.17023510 0.00000000  00000-0  00000-0 0    08
    2 99991  51.9972 177.6125 0014379 284.5564  75.4435 13.91200000    03
    
    So I assume this is the fourth Globalstar.
    
    >A flashing geosynch with a period of about 69 seconds was
    >seen very near the predicted positions for the Globalstars on
    >the first pass.  I haven't had time to try to ID it.  I tried
    >a couple of hours later to see if it was Gorizont 23 (91-046A,
    >21533) but did not see that one at that later time.
    
    The prediction for Gorizont 23 for 2:29 UT (June 6) matches the
    star pattern where this object was seen.
    
    Mike McCants
    Austin, TX - BCRC - 30.32 N, 97.87 W
    
    
    
    
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