Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mailrus!ncar!noao!groves
From: groves@noao.edu (Lee Groves)
Newsgroups: sci.space.shuttle
Subject: Re: Hubble Space Telescope
Message-ID: <1136@noao.UUCP>
Date: 21 Jul 89 23:19:05 GMT
References: <2217@ccncsu.ColoState.EDU>
Organization: National Optical Astronomy Observatories, Tucson, AZ
Lines: 24

From article <2217@ccncsu.ColoState.EDU>, by wendt@segovia.CS.ColoState.Edu (alan l wendt):
> 
> I've heard that the telescope will be launched with defective charge-
> coupled device arrays and that the plans are to replace them in a
> later service visit.  Anybody know anything about this?
> 
> Alan Wendt

Here at NOAO, we have a contract to evaluate "next generation"
CCDs.  What I hear is 5 years until they fly.  I hope that means
they go up on a "service" flight....

Believe it or not, I have seen a chip with  < 10 photon per ADU sensitivity!
(ADU = Analog to Digital Unit.)

(I do the CCD camera system software here.)

Lee

-- 
Lee J. Groves, National Optical Astronomy Observatories, Tucson, AZ
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