RE: USA 129 post-manoeuvre elements

From: Ted Molczan (molczan@rogers.com)
Date: Sat Aug 28 2004 - 18:07:42 EDT

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    Björn Gimle wrote:
    
    > (MM=14.71972546); just ~0.10 early on Ted's
    > 1 70000U          04240.85818665  .00014500  00000-0  19570-3 0    02
    > 2 70000  98.0110 301.1946 0530000  24.6838 337.8764 14.71992008    00
    > which puts the time of manoeuvre at 2004 Aug 26 16:58:58 UTC
    
    I regret that I worded the quoted message poorly. The above elset corresponds
    with the rev-earlier perigee passage, 2004 Aug 26 UTC: 15:21:17 UTC.
    
    Updating my analysis to the ascending node prior to Bjorn's obs of Aug 28 UTC
    yields:
    
    USA 129         15.0  3.0  0.0  5.3 v
    1 24680U 96072A   04241.80979169  .00012847  00000-0  17584-3 0    07
    2 24680  98.0117 302.1349 0529962  21.6398 340.6321 14.72016519    07
    Arc 2004 Aug 26.64 - 28.82, WRMS residuals = 0.029 deg
    
    Note that in order to help constrain the solution to yield realistic results, I
    began the arc at the moment of the perigee passage of the manoeuvre, using an
    estimated observation derived from the final pre-manoeuvre elset, looking
    straight up from the sub-satellite point beneath perigee: 29.898 S, 89.836 E, 0
    m:
    
    24680 96 072A   0000 G 20040826152117000 17 25 1941324+295320 00 S
    
    I will abandon this estimated observation when the duration of the arc of
    post-manoeuvre obs grows sufficiently long to yield a reliable solution
    unassisted.
    
    Here is the updated summary of all of the USA 129 (96072A / 24680) reboosts
    during the life of USA 164 (01044A / 26943), for which I have orbital elements:
    
                                 01044A lag
    96072A boost  UTC     Lat      h:mm:ss
    ---------------------------  ----------
    2002 Apr 04  16:27  00.17 S   +2:41:41
    2002 Jun 27  15:09  81.45 N   +2:40:31
    2002 Sep 12  16:35  14.52 S   +2:45:44
    2003 Jan 17  14:03  39.72 N   +2:39:00
    2003 Mar 27  15:46  81.39 S   +2:46:00
    2003 Jun 05  18:44  42.13 N   +2:40:39
    2003 Aug 07  13:58  16.61 S   +2:37:09
    2003 Oct 16  14:33  31.89 S   +2:48:44
    2003 Dec 18  12:54  57.99 N   +2:42:16
    2004 Feb 12  17:34  60.42 N   +2:44:06
    2004 Mar 18  17:43  06.00 S   +2:42:31
    2004 Mar 23  14:16  09.74 N   +2:42:16
    2004 Jun 17  13:55  72.28 S   +2:46:57
    2004 Aug 26  15:21  29.90 N   +2:40:19
    
    The reboost times ranged between 12:54 and 18:44 UTC, about a 6 hour span. It
    may be a meaningless coincidence, but taking into account daylight saving time,
    they fit within the local hours of 07:00 to 15:00, of North America's eastern
    time zone.
    
    Ted Molczan
    
    
    
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