RE: STSS-ATRR preliminary elements from observations

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Wed May 06 2009 - 14:29:21 UTC

  • Next message: Bram Dorreman: "Photometric Obs. BD in April 2009"

    Russell has finalized his observations, and Alberto has reported his. I am
    awaiting clarification from Viktor regarding reporting format, but in the
    meantime, here are a couple of possibilities:
    
    Allowing all elements to vary, yields a nearly circular orbit:
    
    STSS-ATRR                                                864 X 876 km
    1 34903U 09023A   09125.96358401  .00000000  00000-0  00000-0 0    09
    2 34903  98.9513 224.2461 0007714 226.2723 133.7807 14.06067719    00
    Arc 20090505.9-0505.97 WRMS resid 0.067 deg
    
    Forcing inclination to 99 deg and eccentricity to 0.003, yields:
    
    STSS-ATRR                                                848 X 892 km
    1 34903U 09023A   09125.96355331  .00000000  00000-0  00000-0 0    08
    2 34903  99.0000 224.3195 0030000 162.0781 198.1452 14.06073374    08
    Arc 20090505.9-0505.97 WRMS resid 0.072 deg
    
    The latter would imply that further manoeuvres to circularize the orbit could be
    expected.
    
    As always, additional observations over a longer arc will clarify matters.
    
    As for the 2nd stage, radio observations by Greg Roberts (South Africa) and
    Richard Flagg (Hawaii) were in reasonably close agreement with my estimated
    elements, adjusted (this time correctly) for the 25 s late launch:
    
    STSS-ATRR r
    1 71950U          09125.95957157  .00247275  00000-0  30000-3 0    03
    2 71950 112.7800 216.3633 0519924 282.5289  71.8193 15.08518086    04
    
    It was perhaps 30 s to 60 s late, but for tonight I recommend allowing for
    prediction time uncertainty of at least several minutes. Also, inclination and
    plane could easily be out by 1 deg.
    
    Ted Molczan
    
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