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From: fred@inuxc.UUCP (Fred Mendenhall)
Newsgroups: net.astro
Subject: IRAS-SETI?
Message-ID: <879@inuxc.UUCP>
Date: Wed, 28-Dec-83 10:33:49 EST
Article-I.D.: inuxc.879
Posted: Wed Dec 28 10:33:49 1983
Date-Received: Fri, 30-Dec-83 00:29:09 EST
Organization: AT&T Consumer Products Div., Indianapolis
Lines: 11


	I just finished reading Jan Sky & Telescope's
article on IRAS. The initial data tends to indicate that of
450 stars searched only 50 had associated debris and dust
clouds thought to be caused by possible planetary systems.
	This is about 11 per cent. Does anyone remember
what Carl Sagan was estimating the number of planetary
systems were in Drake's	equation? If this result is verified
how is it likely to affect the SETI searches?

				Fred Mendenhall