M91 | NGC 4548 | Spiral Galaxy | Coma Berenices | 63,000,000 Light Years Away
Messier 91 is a barred spiral galaxy located in the constellation Coma Berenices. However, it’s important to note that Messier 91 is a controversial object, as there is ongoing debate among astronomers regarding its existence. Charles Messier did not include Messier 91 in his original catalog, and it was later suggested by Owen Gingerich in 1953 that Messier might have made an error in his observations, and Messier 91 could be an erroneous duplication of Messier 58.
Due to the controversy surrounding Messier 91, there is limited information available about its properties and characteristics. Some sources consider it a non-existent or duplicate entry in the Messier catalog. The debate highlights the challenges and complexities involved in historical astronomical observations, cataloging, and the potential for errors in identifying and documenting celestial objects.