RE: Re last night's SATOBS

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Thu Dec 09 2010 - 16:30:47 UTC

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    Peter Wakelin wrote:
    
    > I was not happy with my obs of 00-596A / 90006 made last 
    > night.  Findsat did not come up with an alternative but
    > I now suspect it was 98-05A / 25148 / SDS 3F1 not seen for
    > about 8 months.
    
    The correlation with 00596A is excellent, and Mike McCants' int2 propagated elset required only
    minor adjustments to fit your observations:
    
    00596A                                                1613 X 38731 km
    1 90006U 00596A   10342.68325998  .00000000  00000-0  00000-0 0    08
    2 90006  64.0395  26.2206 6990222 272.5157  16.0625  2.00667792    00
    Arc 20100926.01-1208.85 WRMS resid 0.012 totl 0.009 xtrk
    
    As for 98005A / 25148 (what I call SDS 2-5), lunisolar perturbations were relentlessly pushing its
    perigee lower, such that by now it could have decayed naturally. 
    
    This was my last elset from observations:
    
                                                           288 X 40074 km
    1 25148U 98005A   10106.59175917  .00000000  00000-0  00000-0 0    07
    2 25148  64.5363  73.7060 7490000 245.6006  23.4840  2.00562485    08
    
    Int2 propagates it to a fatal 81 km perigee height today:
    
    1 25148U 98005A   10343.59882341  .03048323  00000-0  00000+0 0    08
    2 25148  64.3877   7.8826 4671892 240.8670    .0000  6.52377677    02
    
    Since its radio transmissions ended about the time that it was last seen, I suspect it was either
    abandoned or de-orbited, probably the latter.
    
    Ted Molczan
    
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