Re: Newbie GEO question (GRRR: could we stay metric ?)

From: Joerg Kampmann (joerg.kampmann@ibk-consult.de)
Date: Fri Oct 12 2001 - 04:48:06 EDT

  • Next message: Bruno Tilgner: "Re: Starshine 3 obs"

    Hi all, 
    
    being there without metrics is just horrible for Europeans :)
    so it is good that you put it there ...
    
    Jörg
    
    Bram Dorreman schrieb:
    > 
    > 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.
    > >
    > >Thanks in advance,
    > >Bill
    > >www.velocity.net/~escape
    > >
    > >
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