Article View: sci.space
Article #7633Re: Space Telescope
From: Jeffrey W Percival
Date: Fri, 17 Oct 1986 00:25
Date: Fri, 17 Oct 1986 00:25
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In article <4270002@hpfcla.HP.COM> ajs@hpfcla.HP.COM (Alan Silverstein) writes: >> Will the ST ever be pointed at the Earth? > >Certainly possible, but it would constitute a gross defeat of free >scientific endeavor. It would mean stealing precious time from the >astronomers lined up to use the scope. ST will look at the earth for calibration purposes. Some of the instruments need a diffuse, uniform source of illumination so they can map out their aperture locations, and the earth or moon would suffice for this. There is an earth/moon flag available to the flight software on board, that indicates when the ST is within some small angle of these objects; the instruments can take action or not, depending on the situation. You can bet there's a sun flag, too. -- Jeff Percival ...!uwvax!uwmacc!sal70!jwp or ...!uwmacc!jwp
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!uwvax!uwmacc!jwp From: jwp@uwmacc.UUCP (Jeffrey W Percival) Newsgroups: sci.space Subject: Re: Space Telescope Message-ID: <363@uwmacc.UUCP> Date: Thu, 16-Oct-86 20:25:01 EDT Article-I.D.: uwmacc.363 Posted: Thu Oct 16 20:25:01 1986 Date-Received: Thu, 16-Oct-86 23:34:16 EDT References: <1322@rayssdb.UUCP> <4270002@hpfcla.HP.COM> Reply-To: jwp@uwmacc.UUCP (Jeffrey W Percival) Organization: UWisconsin-Madison Academic Comp Center Lines: 20