Posted by chrismlt on May 03, 2024; 3:34pm URL: http://astroimagej.170.s1.nabble.com/BVR-transformation-and-instrumental-magnitude-tp2430p2436.html
Thanx Karen for the suggestions/advices.
To perform the transformation of the BVRI data obtained in my system (which include the camera, optic and filters) to the standard BVRI system, I will need to image a standard field, when it transits at meridian, so as not to include atmospheric deviances. The airmass will be constant.
The idea was about getting some 20 one-minute exposures, and to get the mean value of thoses 20 individual images, before computing the instrumental magnitudes.
The AAVSO provides some maps and UBVRI mags for a large number of stars in all standard fields :
(E.g.)