Re: photometry

[Stupendous Man <richmond@a188-l009.rit.edu>]

> Suppose we get a good set of photometric reference stars 
> sometime in the future.  Then we could re-run all the data and possibly get 
> a better result.

> Then we would want to keep the raw images.

  Actually, _if_ sometime in the future we were to learn of an
improved list of reference stars, and _if_ we cared enough to
do something, I believe that we _could_ make all the necessary
adjustments and calculations using the magnitudes output by
the pipeline.  There would be no need to go back to the
original images for this reason.

  I stand by my claim that Tom is not doing irrepairable harm
by keeping cleaned images.

                                  Michael

p.s. Should I start selling tickets for a big Henden/Richmond showdown?  
     I hear ESPN2 may be interested :-)