RE: ORS-1 search elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Wed Aug 17 2011 - 17:37:41 UTC

  • Next message: Derek C Breit: "RE: ORS-1 search elements"

    Derek Breit has reported (off-list) a possible sighting near 2011 Aug 17 04:21:45 UTC, ~3 min early and more than 2 deg
    off track. Scott Tilley saw nothing while searching at about the same time, but he was much farther from the track. I
    searched near 01:19 UTC (-60 s to +180 s) and saw nothing.
    
    The track that Derek reported implies an improbably large error in the plane, so I have altered only the altitude to
    account for the early arrival:
    
    1 73706U          11229.16972919  .00014985  00000-0  21617-3 0    02
    2 73706  40.0000 201.5886 0000766 213.4824 146.5940 15.55036988    01
    
    Increasing the RAAN to ~202.9 deg would better fit the observation.
    
    I recommend using the above (with either RAAN) in addition to the earlier search TLE:
    
    1 73705U          11226.02477666  .00014884  00000-0  21617-3 0    00
    2 73705  40.0000 221.0206 0001168 189.0849 170.9942 15.54853139    02
    
    Happy hunting!
    Ted Molczan
    
    
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