Re: TJM obs of 2003 Jun 06 UTC - USA 129 manoeuvred

From: Björn Gimle (b_gimle@algonet.se)
Date: Fri Jun 06 2003 - 06:54:46 EDT

  • Next message: Ted Molczan: "RE: TJM obs of 2003 Jun 06 UTC - USA 129 manoeuvred"

    In addition to Ted's, I find only Alberto's obs 20:06 on or after the day
    of the 03155.82943925 elset. He reported it being late, but apparantly
    not enough to make analysts believe there was a maneouvre. It looks like
    1.5 s from 03154.07799401 elset.
    Could there have been an inclination change at ascending node, though
    perigee is at 046 ?
    And apogee raised just a minute after the obs ?
    
    OTOH 100 s in 30.75 h extrapolates (linearly!) to 0.0 s at 2003-06-04
    19:38 - too good to be true ?
    
    On this assumption here is a search orbit (thanks to Mike for
    ElObsEnt.zip !)
    Residuals 0.01 deg:
    
    USA 129 jun 04.8-06.2
    1 24680U 96072A   03155.82943925  .00030363  00000-0  32630-3 0    05
    2 24680  97.7732 219.0378 0494535  45.3056 314.6289 14.84090068    03
    24680 96 072A   2701 F 20030606025110000 17 25 0916508+345558 38 S
    24680 96 072A   4641 G 20030604200613850 17 24 1651020+820736 18
    24680 96 072A   4641 G 20030604200652160 17 24 0250370+731011 18
    
    If this were a large maneouvre, it would have been made only two orbits
    before Ted's obs, around midnight (1.15 days after Alberto's obs) - very
    unusual.
    
    The small change means that USA 129 pass time diffs from USA continue to
    increase, but at a lower rate.
    Today 02:44 on a SB pass, a week from now 02:51, so expect the large
    reboost within
    this time frame.
    
    ----- Original Message ----- 
    From: "Ted Molczan"
    > USA 129 (96072A / 24680) was 101.92 s late on 1.3 day old elements:
    > 24680 96 072A   2701 F 20030606025110000 17 25 0916508+345558 38 S
    
    From Pierre/Alberto:
    9607201 4641 200613.85 1651.02 8207.36 +-1'
    9607201 4641 200652.16 0250.37 7310.11 1'
    
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