Re: Orbit Computation: How? (Was "99099A elements")

Bjoern Gimle (
Sun, 20 Jun 1999 11:38:46 +0200

>The answer to this question may be over my head, but how does one 'produce'
>elements based on precision observations.  What is the procedure/math
>it?  Is there software to aid in this (formidable?) task?
I use elcor, written by Paul Hirose, modified by Mike McCants, available
at Mike's in /pub/users/mikem.
It needs an approximate starting orbit, relatively correct in time, to
iterate the best orbit, but it does handle all elements including drag
and perturbations over a long period. Mike's own fitelem lets you tweak
the orbit manually.
At you can also find
firstelc, firstfit, firstorb.

There is also IOD by George Lewis.

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