61187

神经网络昆斯林的新闻组分类2006

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From: [e-mail] (Joe Cain)
Subject: Drag free satellites (was: Stephen Hawking Tours JPL)
Keywords: JPL
References: <[e-mail]> <1raee7$[e-mail]>
Followup-To: sci.space
Sender: [e-mail]
Organization: Florida State University Geology Dept.
Date: Sat, 24 Apr 1993 20:57:25 GMT
Message-ID: <[e-mail]>
Lines: 23

In article <1raee7$[e-mail]> [e-mail] (Pat) writes:
>In article <[e-mail]> [e-mail] (Ron Baalke) writes:
>> In answer
>>to a question from Hawking, Chahine described a proposed
>>drag-free satellite, but confirmed that at this point, "it's only
>>a concept." 
>
>SO what's a drag free satellite?   coated with WD-40?

	I am puzzled by the term "concept." Drag free may already have
been flown. It was the idea behind putting up a spacecraft that would
more accurately respond to motions from the Earth's gravity field and
ignore drag. It was proposed many years ago and involved a ball
floating between sensors whose job it was to signal to little
adjustment jets to keep the ball away from them. The ball itself would
then be in a drag free condition and respond only to gravity
anisotropies, whereas the spacecraft itself would be continuously
adjusting its position to compensate for drag.


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