I can’t comment on ASTAP but can say that APT (A Photometry Tool by Russ Laher) considers circular apertures to be a special case of arbitrary elliptical apertures. This may be an appropriate way of enhancing ASTAP if the code is going to be uprated anyway…
Elliptical apertures are extremely useful for phometry of galaxies. Might they also be for cometary comae?
Thanks for the link to sourceforge. I will check out its contents.