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Re: Database error estimates


--- Stupendous Man <richmond@stupendous.cis.rit.edu> wrote:

>   The values stored in the database are calculated for
> each instrumental magnitude extracted from each image.
> They are based on simple photon statistics: an aperture
> of radius N pixels contains a total signal of E counts

Is the aperture fixed at N pixels?  Wouldn't it be better
if it were fixed at a constant angular diameter? 
 
I don't think the angular size of a pixel can be constant
over the entire image if the image is as wide field as 
the Mk IV.

If someone would send me the terms of an X,Y to RA,.DEC
Nth order transform I'll work out the size of the error
I'm sure this transform must be a byproduct of the pipeline
and the numbers are available.


=====
Chris Albertson
  Home:   310-376-1029  chrisalbertson90278@yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson@aero.org
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