Re: Now where's the Champagne = I see the unid sat :)

From: Mike McCants (mmccants@prismnet.com)
Date: Sun Jul 14 2013 - 21:47:10 UTC

  • Next message: C. Bassa: "CB Obs July 14, 2013; Part 1: Kevin's July 6th unknown!"

    C. Bassa posted:
    
    >This confirms that the observations of July 6 and 13 belong to the same
    >object.
    
    Fine.  But it seems possible to me that we still don't know how many
    revolutions took place during those 7 days.
    
    27 revs gives 3.84 revs/day
    28 revs gives 3.98 revs/day
    29 revs gives 4.12 revs/day
    30 revs gives 4.26 revs/day
    
    Of course we might have a good chance to catch it again in the same place
    after the same elapsed time - 7.04 days.  This would be July 13 about 7:25
    + 7.04 days = July 20 about 8:30 UT.
    
    >This is an approximate search orbit, and with a perigee of 223 km the Bstar
    >drag term might be quite large; expect the object to be early or late.
    
    If there is a very large drag term, then the mean motion will be
    much higher and the object will be 10 or 20 or 30 or 60 minutes early.
    On the other hand, if the eccentricity is off a bit,
    the cross-track error could be 1/2 degree of so.
    
    Possible orbits with zero drag:
    
    1 99208U 13687A   13194.22215076  .00000000  00000-0  00000-0 0    09
    2 99208  20.6868 284.8736 6249644 153.1266 208.1020  3.83657729    00
    
    1 99208U 13687A   13194.22215076  .00000000  00000-0  00000-0 0    09
    2 99208  20.3946 283.6989 6118355 154.2702 202.1525  3.97863467    09
    
    1 99208U 13594A   13194.22778573  .00000000  00000-0  00000-0 0    02
    2 99208  20.1195 282.5116 5987589 155.4659 204.5337  4.12068899    00
    
    1 99208U 13594A   13194.22778573  .00000000  00000-0  00000-0 0    02
    2 99208  19.8608 281.3300 5857452 156.6862 198.8141  4.26274010    07
    
    Perhaps 4.12 is the most likely.
    
    Orbit with a medium drag term - about 15 minutes early on July 20
    compared to zero drag:
    
    1 99208U 13594A   13194.22778573  .00099730  00000-0  40955-2 0    05
    2 99208  20.1354 282.5575 5987527 155.5009 204.2728  4.12748970    04
    
    Orbit with a very large drag term - three hours early on July 20!
    
    1 99208U 13594A   13194.22848017  .00491106  00000-0  85060-2 0    05
    2 99208  20.1961 282.7143 5987592 155.6681 204.2882  4.15418996    06
    
    Mike McCants
    _______________________________________________
    Seesat-l mailing list
    http://mailman.satobs.org/mailman/listinfo/seesat-l
    



    This archive was generated by hypermail 2b29 : Sun Jul 14 2013 - 21:48:32 UTC