Re: Best method to define aperture radii

Posted by karenacollins on Jan 14, 2023; 1:11pm
URL: http://astroimagej.170.s1.nabble.com/Best-method-to-define-aperture-radii-tp2085p2089.html

The answer to your main question is numbers 1 and 2. There is no universal best aperture selection option. It depends on your goals, the stars in the observed field, the personal preference of the user, etc. However, I can write-down general guidelines. I will do that and post a link back here.

In the mean-time, I think you are not on the latest build. I recommend the latest "daily build" in the update option. It has a new multi-aperture option between your number 1 and number 2. It is called "Auto Fixed Apertures from multi-image T1 radial profiles". If there is no star near your target star, I recommend getting started with it. If there is a star contaminating that automatically selected aperture, then I recommend using the first option (Fixed aperture) and selecting an aperture radius that maximizes the flux in the aperture from the target star, while minimizing the flux from the contaminating star. If the stars are similar brightness, then you'd want to set the aperture radius to be half the distance between the two stars.

Karen