Re: Calculation of apparent magnitude from apparent brightness

Posted by karenacollins on Jul 12, 2024; 11:35am
URL: http://astroimagej.170.s1.nabble.com/Calculation-of-apparent-magnitude-from-apparent-brightness-tp2475p2476.html

AIJ is calculating apparent magnitudes of target ('T' labeled) stars from the apparent magnitudes of comparison ('C' labeled) stars that you look up from catalogs (e.g. SIMBAD) and enter into either Multi-Aperture or the Ref Star Panel. In other words, it is calculating the difference in apparent magnitude compared to the comp stars based on the difference in flux from the comp stars. This avoids needing to know anything about the telescope, detector, observing conditions, etc.

As a note, the catalog comp star apparent magnitudes should be in the same filter that is used for the observation.

Karen