Re: NORAD model for geostationary satellites

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|>Has anybody ever confirmed or otherwise, by direct comparison of
|>observation and prediction, that the SDP4 model gives correct positional
|>results with an accuracy in the order of 5 arcminutes?

Is this the SDP4 algorithm published in the Spacetrack Report (number 3
I think it was) by Hoots et al? I recall reading somewhere (I forget the
source) that this algorithm was inaccurate (or simply, in some cases,
wrong). The recommendation was to use SGP (though I also recall reading
somewhere else that the SDP4 algorithm had been corrected but [again] I
don't know where this was stated or if the updated model was described
anywhere).

regards,

-- 
Neil Clifford                                       <neil@satellite.eu.org>
                                  http://www.satellite.eu.org/satintro.html

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