Astrometry Settings Issue - Limit Max Peaks in 8-bit Images

Posted by mketi on Mar 22, 2021; 9:00am
URL: http://astroimagej.170.s1.nabble.com/Astrometry-Settings-Issue-Limit-Max-Peaks-in-8-bit-Images-tp1530.html

Hi there,

I've been working on a little project hat requires plate solving images produced in a small refractor and a sensor with fairly large pixels. I'm not sure if it's the right thing to do, but to counter star blockiness and keep out saturated reference stars, I selected the "Centroid Near Peaks" and "Limit Max Peaks" options in the Astrometry Settings area.

Based on the plate solving animations, it looks like centroid option works. I'm not sure about the "Limit Max Peaks", however. AIJ often seems to circle stars that are over my set limit. In my 8-bit images, if I set the max peak limit to 250, saturated stars with peak values of 255 may still be selected. When I lower the max peak limit all the way down to 30, it seems to stop choosing the saturated stars. Is the program behaving correctly, or am I perhaps doing something wrong?

Thanks very much for your help!

Matt