Optimum usage of AstroImageJ for diffuse objects such as comets

Posted by GordonMcKay on Oct 13, 2021; 3:51pm
URL: http://astroimagej.170.s1.nabble.com/Optimum-usage-of-AstroImageJ-for-diffuse-objects-such-as-comets-tp1630.html

I am using AstroImageJ in a multi-aperture photometry exercise to derive the relative flux for several comets. The potential issue with circular apertures is that it is almost certain that often some of the tail of the comet will be in the background anulus. The background algorithm in AIJ is good and in all probability there ought not to be a significant bias due to material in the comet tail. Does anyone have any experience with the use of AIJ for comets or diffuse objects?