Re: T1 centroid not stable

Posted by karenacollins on Jun 23, 2024; 8:20am
URL: http://astroimagej.170.s1.nabble.com/T1-centroid-not-stable-tp2456p2457.html

Hi Gerhard,

The variable aperture modes change the photometric aperture radius on a per image basis in case there are large changes in FWHM (e.g. seeing, or focus, etc. changes) to attempt to improve precision for those cases. However, these modes can introduce more systematics depending on many factors, so it's best to use a fixed aperture in most cases.

Karen