Messier 103 is the small cluster in the top right of the image. Shown here with comet Lovejoy in March 2015. The small red patch above the comet is the Dolphin nebula. I’m not sure how Charles Messier missed the much brighter and bigger Owl Cluster, bottom left!
Image details: Nikon D7000, Nikkor 180mm f2.8 at f2.8. 16 minutes (32 x 30 seconds) at iso 800 using didymium filter, plus 2 minutes (4 x 30 seconds) at iso 800 using . Stacked with Deep Sky Stacker and tracked with barn door tracker.