RE: Bad Lacrosse 2 Ob

From: Ted Molczan (
Date: Thu Mar 05 2009 - 02:06:48 UTC

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    Peter Gertson wrote:
    > Ok-- I was using 15 X 70 binocs.  A little hurried as my pooch was
    > chasing deer in the field.  But I got a very bad observation of 
    > Lacrosse  2.  Can someone help point out my errors?  I counted it
    > as an app even  though it was clearly north of Epislon U Ma.
    > But the time seems way off ??
    > 21147 91 017A   0000 P 20090305001556870 17 25 1254031+555759 37  S
    The epoch 09059.78535192 elements predict an appulse about 0.07 deg above the
    star, but about 40 s earlier than you reported. Could have made an error in
    reducing the time?
    Lacrosse 2 does make small manoeuvres from time to time, so there is a small
    chance that it was late due to having raised its orbit. Had it arrived ~40 s
    late, then it would have passed about 0.3 deg above the star; since you reduced
    it as a coincident appulse, I gather it was much closer to the star, in which
    case a reduction error seems the more probable explanation.
    Ted Molczan
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