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Re: more details of signal-to-noise calculations for Mark IV

To: Tom Droege <droege@fnal.gov>
Subject: Re: more details of signal-to-noise calculations for Mark IV
From: Chris Albertson <chris@topdog.pas1.logicon.com>
Date: Wed, 28 Oct 1998 15:04:19 -0800
Cc: tass@wwa.com, Stupendous Man <richmond@a188-l009.rit.edu>
Delivery-Date: Wed Oct 28 18:01:58 1998
Organization: Logicon RDA
References: <1.5.4.16.19981028160345.2adf175c@popgtw.fnal.gov>
Sender: chris@topdog.pas1.logicon.com

Tom Droege wrote:
> 
> I thank Michael for his nice computation.  The computations that I did for
> the design of the Mark IV had somewhat more pessimistic numbers for the
> photons from a mag 0 star.  This led to the assumption that we would want to
> make exposures in the same range as the Mark III.  6 minutes or so.

I'm still reading Michael's message but I don't see where he
assumes we are pointing.  Is it to zenith (airmass = 1.0)
or down at the equator?
Is atmospheric extinction built into the "photons from a mag
zero star" constant?

--Chris Albertson

  chris@topdog.logicon.com                Voice:  626-351-0089  X127
  Logicon RDA, Pasadena California          Fax:  626-351-0699

References:
- Re: more details of signal-to-noise calculations for Mark IV
  - From: Tom Droege <droege@fnal.gov>

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