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From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: sci.space
Subject: Re: Space Telescope
Message-ID: <7240@utzoo.UUCP>
Date: Fri, 17-Oct-86 13:40:31 EDT
Article-I.D.: utzoo.7240
Posted: Fri Oct 17 13:40:31 1986
Date-Received: Fri, 17-Oct-86 13:40:31 EDT
References: <1322@rayssdb.UUCP> <4270002@hpfcla.HP.COM>, <363@uwmacc.UUCP>
Organization: U of Toronto Zoology
Lines: 15

> 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.

Possibly not.  My recollection is that the attitude-control system is
forbidden to point the ST at the Sun, and won't even point it near the
Sun unless specially ordered to.  There is also a completely independent
system, which cannot be turned off, which closes the telescope's lid if
the line of sight starts to intersect the Sun.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,decvax,pyramid}!utzoo!henry