Article View: sci.space
Article #7869Re: satellites
From: Larry Wall
Date: Tue, 12 Jan 1988 21:12
Date: Tue, 12 Jan 1988 21:12
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In article <1175@eneevax.UUCP> daveb@eneevax.umd.edu.UUCP (David Bengtson) writes: : For the visible range ( lambda ~ 555 nanometers ) and D = 2 meters, : theta = 3.39e-7 radians : For an orbit of 200 miles, features resolve to ~ 5 inches. Not bad, but : that assumes a perfect atmosphere. You guys are all assuming a big round mirror. Now, it's true that for looking at faint stars you need a lot of mirror acreage, but there's plenty of light bouncing off of Lebanon. You don't need a huge round mirror to get the aperature you want--just build a frame that will stay rigid in microgravity and hang several smaller mirrors on it with a common focus. What's the resolution for a mirror with an effective aperature of, say 20 meters? How many 1 meter mirrors would it take to get the interferometry to come out right? Larry Wall lwall@jpl-devvax.jpl.nasa.gov
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!rutgers!ames!elroy!devvax!lwall From: lwall@devvax.JPL.NASA.GOV (Larry Wall) Newsgroups: sci.space,sci.crypt Subject: Re: satellites Keywords: resolution Message-ID: <990@devvax.JPL.NASA.GOV> Date: 12 Jan 88 21:12:02 GMT References: <873@uop.edu> <2166@umd5.umd.edu> <4910@well.UUCP> <1952@netsys.UUCP> <2209@bloom-beacon.MIT.EDU> <2604@calmasd.GE.COM> <1175@eneevax.UUCP> Reply-To: lwall@devvax.JPL.NASA.GOV (Larry Wall) Organization: Jet Propulsion Laboratory, Pasadena, CA. Lines: 16