Instrumental magnitude

Posted by sscygni on Dec 14, 2017; 11:53am
URL: http://astroimagej.170.s1.nabble.com/Instrumental-magnitude-tp937.html

Dear Karen
we are teaching broad-band photometry (B, V, R, I) to high school students and we would like to use your wonderful software not only for exoplanets but also for variable stars. We have a little problem. We could not find in the user guide how to derive the instrumental magnitudes of the target and the comparison stars. Our goal is to use the instrumental magnitudes in two bands (usually B and V) to compute the apparent magnitudes through a linear regression of the comparison stars (V-v = alpha * (b-v) + k) and check in the resulting graph the presence of outliers. How can we proceed?
Thank you so much
Marta