Updated elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Mon Apr 13 2009 - 16:31:35 UTC

  • Next message: Scott and Becky Campbell: "Satobs 13 Apr 2009"

    New observations by Greg Roberts and Viktor Voropaev reveal that USA 202 (09001A
    / 33490) has manoeuvred, and is once again drifting west.
    
    Peter Wakelin's observations of 2009 Apr 08 UTC, also were after a manoeuvre; if
    the same manoeuvre also underlies Greg and Viktor's observations, then elset
    70001 applies, and it is drifting west ~0.25 deg/d.
    
    ~0.25 deg/d west
    1 70001U          09102.24877036  .00000000  00000-0  00000-0 0    00
    2 70001   2.8893 339.0818 0019124  93.5862 266.2319  1.00203269    04
    
    I see indications in the data of a manoeuvre after Apr 08, for which I offer
    ~0.5 deg/d and ~1 deg/d search elsets (the object has previously drifted at both
    rates):
    
    ~0.5 deg/d west
    1 70002U          09102.24843829  .00000000  00000-0  00000-0 0    04
    2 70002   2.8690 339.1747 0015797 101.4688 258.3045  1.00133000    02
    
    ~1 deg/d west
    1 70003U          09102.24585243  .00000000  00000-0  00000-0 0    08
    2 70003   2.8721 339.2114 0014350 128.5553 230.5391  1.00000000    01
    
    Russell Eberst has recovered 92086C / 22519, more than six months after it was
    last observed, running about an hour early. It takes considerable skill and
    patience to conduct the lengthy planar searches required to recover lost objects
    with such large prediction errors.
    
    I believe the following are reasonably accurate:
    
    USA 89 r                                                336 X 6731 km
    1 22519U 92086C   09102.96103253  .00001504  00000-0  18456-3 0    05
    2 22519  56.9094 117.9126 3225817   4.1118 358.0240  8.79752496    03
    
    David Brierley, Russell Eberst, Björn Gimle, Alberto Rango and Viktor Voropaev
    contributed observations to the analysis of USA 186:
    
    USA 186                                                 258 X 1013 km
    1 28888U 05042A   09102.84981825  .00008932  00000-0  83492-4 0    07
    2 28888  97.8950 166.7737 0538323  15.5573 346.1475 14.77181272    01
    Arc 2009 Apr 09.74 - 12.86, WRMS residuals = 0.035 deg
    
    Ted Molczan
    
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