USA 129 may have manoeuvred

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Fri Apr 17 2009 - 23:47:34 UTC

  • Next message: Derek C Breit: "RE: USA 129 may have manoeuvred"

    Peter Gertson reported USA 129 having run late last night:
    
    http://satobs.org/seesat/Apr-2009/0182.html
    
    Based on additional information provided by Peter, I believe this to be the
    correct reduction of his observation:
    
    24680 96 072A   8039 G 20090417015533590 17 25 0931258+093505 38 S
    
    Has any one observed it on-time tonight relative the last known orbit?
    
    If it has manoeuvred, then it would have occurred on Apr 16 UTC, most likely at
    a perigee.
    
    The following search elements bracket the likely period of the manoeuvre:
    
    Perigee 09:15:45 UTC
    1 70001U          09107.07346583  .00004037  00000-0  57315-4 0    03
    2 70001  97.8405 160.8627 0471500 282.7167  72.1752 14.83633578    05
    
    Perigee 20:34:46 UTC
    1 70002U          09107.07346269  .00004002  00000-0  57315-4 0    07
    2 70002  97.8405 160.8375 0480000 282.7167  72.0816 14.81678889    03
    
    It would be prudent to first check the last known orbit:
    
    USA 129                                                  285 X 940 km
    1 24680U 96072A   09106.12942214  .00004069  00000-0  57315-4 0    02
    2 24680  97.8405 159.9460 0468214 285.8179  69.1901 14.84481501    06
    Arc 20090412.84-0416.14 WRMS resid 0.017 deg
    
    Ted Molczan
    
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