Photo by Pittendreigh
If you have found M101, M102 should be easy. They are one in the same. An error in the 18th century, M101 was given two numbers. Pierre Mechain discovered M101 and also described a similar discovery nearby. Messier gave both objects numbers. Mechain himself realized the error, and that his discovery of M102 was simply a stumbling over his previously observed galaxy.
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