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Article #38Re: Mars Observer Update - 10/09/92
From: Thomas E. Smith [LORAL]
Date: Mon, 12 Oct 1992 10:55
Date: Mon, 12 Oct 1992 10:55
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>Forwarded from:
>PUBLIC INFORMATION OFFICE
>JET PROPULSION LABORATORY
> Today Mars Observer is about 4.5 million kilometers (2.6
>million miles) from Earth, traveling at a speed of about 10,800
>kilometers (7,600 miles per hour) with respect to Earth. The
>spacecraft is traveling at a heliocentric velocity of about
>119,000 kilometers per hour (74,000 miles per hour).
Only 7,600 mph relative to Earth? Is that right? That's not even escape
velocity (~25,000 mph). I also can't think of a way for the craft to be
going 7,600 mph relative to Earth, and 74,000 mph relative to the Sun.
Can someone clear this up for me?
Tom
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Newsgroups: alt.sci.planetary Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!wupost!bcm!aio!nomad!tes From: tes@nomad.uucp (Thomas E. Smith [LORAL]) Subject: Re: Mars Observer Update - 10/09/92 Message-ID: <1992Oct12.105531.11992@aio.jsc.nasa.gov> Sender: news@aio.jsc.nasa.gov (USENET News System) Organization: Software Technology Branch - NASA/Johnson Space Center Date: Mon, 12 Oct 1992 10:55:31 GMT Lines: 18