Chertan in Leo Major

Chertan is an important star as a reference to locate several galaxies in the area, for example M65 and M66. Tonight I have stacked 550 shots into one image. The night has been clear, but I am located in a light polluted urban area. It has been necessary to substract the pollution from the background twice. The map shows stars up to 10th magnitude and the photo shows up to 12th magnitude.