RE: Problems with elements?

From: Ted Molczan (
Date: Thu Dec 09 2004 - 18:01:37 EST

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    Bruce MacDonald wrote:
    > I'm having problems reducing my obs for this evening's pass 
    > of 97-064A. ObsReduce keeps telling me that this ob is 277 
    > degrees azimuth and 5 degrees:
    > 25017 97 064A   2751 G 20041209172951060 17 25 1625275+092276 
    > 97 S+045 05
    That is correct for your location and the observation time. 
    > It also shows the sat moving from W to E when in fact it was 
    > moving from E to W.
    W to E travel is expected of Lacrosse; never E to W. Are you certain that you
    did not follow an aircraft?
    If not an aircraft, I see three possible explanations:
    - observation time reduction error
    - tracked wrong satellite
    - tracked correct satellite, which was significantly early
    If you are certain of the time, and if you know any of your reference star
    pairs, then I suggest reducing them as is.
    Ted Molczan
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