Re: Some questions about Chandra's orbit

From: Robert G Fenske Jr (
Date: Sun Sep 09 2001 - 17:50:35 EDT

On Sun, 9 Sep 2001, Ahmet Gorgun wrote:

> What is the cause of this circularization trend? Does this happen with
> every satellite of eccentric orbits? And why the different rate of motion
> for perigee and apogee?

	Lunar and solar gravitational effects play a role in perturbing
satellites that orbit far from Earth, especially an orbit like Chandra's that
reaches half way to the Moon.  At apogee the satellite is moving the slowest
and the lunisolar effects are greatest, so the velocity vector is more easily
perturbed; this ultimately causes a bigger change for the perigee.

Robert Fenske, Jr.    Sw     |The Taming the C*sm*s series:
Southwest Research Institute            /R---\  |
Signal Exploitation & Geolocation Div  | I    | |"The Martian canals were the
San Antonio,Texas USA  ph:210-522-3931  \----/  | Martians' last ditch effort."

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