Re: SNR calcs

Posted by brandx on Jun 07, 2023; 7:39pm
URL: http://astroimagej.170.s1.nabble.com/SNR-calcs-tp2244p2251.html

I re-checked the FITS data files.  The version I was using had gone through Pixinsight to align them (I didn't realise alignment wasn't strictly necessary with WCS) and for some reason the resultant files had much lower counts.  I reverted back to the original files and all is good - decent counts and SNR.

I am now comparing the aperture sizing AIJ calculates versus doing a manual set of trial apertures in Starlink Gaia which tends to show a higher SNR for smaller apertures compared to AIJ