Re: [ATM] The Hubble mirror goof up.

["Alan Scott" <alanne1956@hotmail.com>]

Probably not as good as the Sky and Telescope article, but here is a web 
page that tells about the error:

http://www.uoguelph.ca/~ebaig/brian.html


Alan Scott
http://www.xmission.com/~alanne/Astronomy.html

>From: "Scott Ewart" <scott.e@quicksurfer.com>
>To: <atm@atmlist.net>
>Subject: Re: [ATM] The Hubble mirror goof up.
>Date: Tue, 8 Mar 2005 00:09:21 -0500
>
>
>
>
>
>At 07:19 PM 3/7/2005, Mark Holm wrote:
> >I remember there was a rather detailed and complete analysis of the error
> >presented in a Sky and Telescope article.  From reading that several 
>years
> >ago, I do remember it seems the big screw up was not doing a sanity check
> >by another method.
>
>My recollection is that both reflective and refractive Offner null tests
>were performed. The reflective null was supposed to be more accurate.
>
>
>
>     What I remember reading was that not one, but two other null tests 
>were
>performed and did show the error.  But as previously stated, the reflective
>test was considered more accurate.  Why noone figured out WHY the tests
>disagreed, one can only speculate.  Must have been pressure to deliver
>quickly.
>
>Scott
>
>
>
>
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