Mark,
Looks like my replies have been pre-empted by Peter and Tim (though
without the correct capitalisation of KAPPA, FITSLIST, and Figaro).
Just to add to Peter's remarks, instrumental in effect means you
calculate -2.5log10(array value). For aperture photometry, the array
value is a sum in some region centred on a source. I would suspect that
aperture photometry is what the user requires.
PHOTOM APPHOT - integrates flux in aperture, suitable for
for stars and individual compact objects
GAIA xguiphot graphical interfaces
(S)EXTRACTOR FOCAS - forms inventory of sources using a variety
of techniques, and has object classification
DAOPHOT DAOPHOT - stellar photometry of crowded fields such as
STARMAN in globular clusters, using the PSF to deblend
ESP ISOPHOTE - bright galaxy photometry, with
elliptical isophote fitting
IRAF also has various Cookbooks http://iraf.noao.edu/docs/photom.html.
There are various other packages often seen in the literature like
DoPHOT (another PSF-fitting application) and VISTA.
There is also YoMAMA (a SoG-type tool with aperture photometry).
Malcolm
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