# Re: Newbie GEO question

From: Bram Dorreman (bram.dorreman@skynet.be)
Date: Thu Oct 11 2001 - 18:00:57 EDT

• Next message: Mitchell: "GEO orbit"

Bill,

You can easily calculate this for yourself:
These GEO sats have an orbit with a radius of
6371 + 35789 km = 42160 km (Earth radius + orbital height)or
3960 + 22243 miles = 26203 miles

So the orbital circumference = 2 * pi * Radius:
2 * pi * 42160 km = 264899 km or
2 * pi * 26203 miles = 164638 miles

The satellite travels this distance in 24 hours (in fact in about 4 minutes
less).
So its speed is:
264899 / 24 km/h = 11037 km/h or
164638 / 24 miles/h = 6860 miles/h

If you like the speed per seconde, divide those amounts by 3600 (seconds in
one hour).

You get:
11037 / 3600 km/s = 3.066 km/s or
6860 / 3600 miles/s = 1.906 miles/s

I hope I did not make a mistake.

Bram Dorreman, leader Belgian Working Group Satellites.
COSPAR 4160 (Achel 1):
51° 16' 45.5" N (51.2793 N),
5° 28' 36.6" E (5.4768 E)

-----Original Message-----
From: Bill Mitchell <escape@velocity.net>
To: SeeSat <SeeSat-L@satobs.org>
Date: donderdag 11 oktober 2001 20:54
Subject: Newbie GEO question

>Greetings,
>
>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.
>
>Bill
>www.velocity.net/~escape
>
>
>-----------------------------------------------------------------
>Unsubscribe from SeeSat-L by sending a message with 'unsubscribe'
>in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org
>http://www.satellite.eu.org/seesat/seesatindex.html
>
>

-----------------------------------------------------------------
Unsubscribe from SeeSat-L by sending a message with 'unsubscribe'
in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org
http://www.satellite.eu.org/seesat/seesatindex.html

This archive was generated by hypermail 2b29 : Thu Oct 11 2001 - 18:20:57 EDT