# RE: More GEO questions

From: Matson, Robert (ROBERT.D.MATSON@saic.com)
Date: Fri Oct 12 2001 - 13:55:55 EDT

• Next message: Bjoern Gimle: "Re: More GEO questions"

```Bill asked:

> My spreadsheet tells me at an altitude of 60,000 miles (96720km) a
satellite
> needs to cruise at 16,745 mph (26993kph) to remain geostationary. What
would
> happen to this orbit?

The "correct" velocity in order to maintain a circular orbit
at that altitude is much slower than the velocity required to
remain geostationary.  Thus, if a satellite's instantaneous
velocity was 16,745 mph at an altitude of 60,000 miles, its
orbit would probably be hyperbolic -- with closest approach
the sun or moon).  (Actually, I don't have time to run the
calculation right now, but this velocity seems plenty high
enough to exceed escape velocity for this altitude.)

>  Is it possible to remain geostationary out there?  I realize it would be
> very inefficient, but is it possible?

Sure it's possible -- but you would have to continually
expend fuel to do it, constantly attempting to accelerate
toward the earth in order to remain in orbit.

Cheers,
Rob

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