SkyMap propagation using old elements

From: Matson, Robert (ROBERT.D.MATSON@saic.com)
Date: Wed Oct 31 2001 - 19:09:00 EST

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Hi Kevin,

> I can forget about 98002. Using different programs I get different values
of
> where it is. So I won't pay attention to skymap when it comes to older
sats.

The reason SkyMap's results are differing from other programs
is not the epoch of the ephemeris, but rather the unique coding
of SDP4.  You'll probably find very equivalent results if you
propagate with SGP or HANDE and compare that to other programs.
SGP4/SDP4 is different because of its inclusion of solar/lunar
perturbations.

Best,
Rob

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