KeyHole Manoeuvre Alert

From: Ted Molczan (molczan@home.com)
Date: Sun Jul 01 2001 - 08:15:56 PDT

  • Next message: David Brierley: "DMB Obs June 30-July 1"

    Based on their past behaviour, both KeyHoles, USA 116 / 95066A / 23728 and USA
    129 / 96072A / 24680, are likely to make major reboost manoeuvres in the next
    few days. Both would manoeuvre on the same day.
    
    Most past major reboosts have occurred when either spacecraft's argument of
    perigee was over the equator, +/- about 1 day.
    
    USA 129's argument of perigee will be on the equator tomorrow, 2001 Jul 02 at
    about 10 h UTC. The manoeuvres could occur +/- 24 h of that time, but my guess
    is that they will occur close to that time, perhaps a few hours later.
    
    If the spacecraft do not manoeuvre tomorrow, then the next opportunity occurs
    on 2001 Jul 12, when USA 116's argument of perigee will be over the equator.
    
    My ability to participate in the tracking or analysis of these events is in
    doubt, because of a prior commitment, which requires my availability on short
    notice.
    
    I hope to at least provide a set of USA 129 search orbits that would simplify
    the post-manoeuvre recovery task for observers. I hope to post that by 2001 Jul
    02 12 h UTC, in time to be useful to European observers.
    
    Here are Mike McCants' most recent elsets:
    
    USA 116         15.0  3.0  0.0  5.1 v
    1 23728U 95066A   01175.96089382  .00020000  00000-0  42044-3 0    09
    2 23728  97.9050 288.1363 0428000  57.4555 302.5444 14.84282408    03
    
    USA 129         15.0  3.0  0.0  5.1 v
    1 24680U 96072A   01179.11693492  .00031000  00000-0  40239-3 0    05
    2 24680  97.8272 241.0441 0482000 194.1316 165.8683 14.83188650    03
    
    Ted Molczan
    
    
    
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