Looking at the ZeroPoint value (Visual PinPoint v7) in the plate solve, can this be used as an estimator of the faintest stars visible in the image? My values are around 22.5 (1 sec) for a 300 sec exposure.


My goal is to try to determine what magnitudes I am reaching. ±0.1 or ±0.5 of a mag would be sufficient. What is the best way to determine this star magnitude value? There is the manually compare the image with a star chart method, but I am curious if there is a better way to do this?

Thanks Bob!