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NGC4236 (also Caldwell 3) is the largest galaxy in the Draco constellation.  It is a barred spiral galaxy that is part of the M81 group of galaxies.  Despite its large size (about 2/3 the size of the moon) it is quite faint and required significant exposure time.  

Acquisition Details

LUM = 43x10min
RGB = 40x10min each
Total = 27hrs 10min