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FW: AO40 velocity




Both Stacey and I gave Bob the Vis-Viva equation.  While Stacey
wrote a better treatment,  our answers are identical.

Bob

-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of Margaret Leber
Sent: Thursday, August 29, 2002 10:03 PM
To: amsat-bb@AMSAT.Org
Subject: Re: [amsat-bb] AO40 velocity


Tom Clark, W3IWI wrote:
> Margaret is correct in stating that the reference frame needs to be
defined.
> The answer that Stacey (W4SM) gave applied to an observer at the center of
> the earth.

Erm...I thought Stacy's answer was relative to an observer aboard an LEO
in circular orbit at the altitude of AO-40's perigee. I thought it was
particularly imaginative. T'was Bob McGuire who posted the
center-of-the-Earth solution.

There's a delighful conversation in Robert Heinlein's "Rocket Ship
Galileo" where, right after launch from Earth, bound for the Moon, two
young crew members get into an argument over "how fast they are going";
looking at the same instument panel they come to completely different
answers. Fortunately their mentor intervenes.

That book taught me a boatload about astronautics at a very young age...

  73 de Maggie K3XS

--
-----/___.   _)   Margaret Stephanie Leber    / "The art of progress  /
----/(, /|  /| http://voicenet.com/~maggie   / consists of preserving/
---/   / | / |  _   _   _    `  _AOPA 925383/ order amid change and /
--/ ) /  |/  |_(_(_(_/_(_/__(__(/_  FN20hd / change amid order."   /
-/ (_/   '  K3XS  .-/ .-/    ARRL 39280   /___ --A.N.Whitehead ___/
/____ICQ 7161096_(_/_(_/__AMSAT 32844____/ <maggie@voicenet.com>


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