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Messier 102
Messier 102 (also known as ''M102'') is a galaxy listed in the Messier Catalogue that has not been identified unambiguously. Its original discoverer Pierre Méchain later said that it was a duplicate observation of Messier 101,〔O'Meara, Stephen James. "M102: Mystery Solved", ''Sky and Telescope'', volume 109, number 3, page 78, March 2005〕 but there are historical and observational reasons to believe that it could be NGC 5866,〔Smith, William Henry. ''A Cycle of Celestial Objects'', 1844〕 although other galaxies have been suggested as possible identities. ==Candidate corresponding objects==
Since the publication of the Messier Catalogue, a number of galaxies have been identified by different historians, professional astronomers, and amateur astronomers as corresponding to M102.
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