[Spice_discussion] Two-line elements

Ed Wright ed.wright at jpl.nasa.gov
Wed Oct 26 16:12:08 PDT 2005

On Oct 26, 2005, at 4:02 PM, William Thompson wrote:

> SPICE users:
> Is there a way to convert SPICE ephemerides into Two-Line Elements 
> (TLE) files?  I was asked to provide this format by a ground station 
> involved in the STEREO mission.  According to what I've been able to 
> glean from the web, TLEs can only be used for satellites in Earth 
> orbit.  Can TLE files be written for deep-space missions?  Is

To: William Thompson
From: Ed Wright

The mathematical model used to represent orbits as TLEs assumes orbit 
around the earth. To my knowledge, TLEs have never been used for 
objects beyond earth orbit. The forces and perturbations beyond the 
earth's sphere of influence greatly differ from the inherent 
assumptions of the TLE model.

As always,
Ed Wright
ed.wright at jpl.nasa.gov

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