Re: Newbie GEO question

From: Jonathan T Wojack (tlj18@juno.com)
Date: Thu Oct 11 2001 - 16:05:57 EDT

• Next message: Bjoern Gimle: "Re: Starshine 3 obs"

```> I'm new to the list and have a question regarding GEO sat's.
> At what speeds do they travel?
> I realize that relative to the earth at 22,000 miles they travel 0,
> but
> let's say bring their orbit down to LEO, how fast would they be
> traveling?
> 17,500?
> I was able to observe one in my homemade 10" telescope, very cool.
> Stars
> move, Satellite doesn't.

I'll theorize:

If we assume that GEO sats orbit at 22,000 miles (I think it's closer to
25,000 miles, but I'm not sure), then I theorize that we can find their
speed (relative to what I don't know).  I think we can just extend the
radius of the Earth 22,000 on paper to discover the satellite's speed:

Diameter = Pi*d
Diamteter = Pi*(22,000+22,000+8,000[Diamter of Earth])
Diameter = Pi*(52,000)
Diameter = 163,362 miles.

Now, this theoretical distance is traveled in approximately 24 hours:

Speed = s[Distance]/t
Speed = 163,362/24
Speed = 6,806 miles per hour

This translates into 1.89 miles per second, which translates into the
perferred 3 kilometers per second.

[This was all a big guess.  I hope it's right!   : - )]

------------------------------
Jonathan T. Wojack                 tlj18@juno.com
39.706d N   75.683d W
http://www.angelfire.com/stars2/projectorion
4 hours behind UT (-4)

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