M91 (NGC 4548)
Messier M91 (NGC 4548) is a barred spiral galaxy located in the constellation Coma Berenices in the Virgo Cluster of galaxies.
Messier M91 is best viewed during late spring, is magnitude 11.5*, and can be viewed with small telescope. It is 5.4 x 4.4' in size. For reference, the full moon is 30' (arc minutes) in size.
* The naked eye can see up to magnitude 8 objects under ideal dark sky conditions.
Find your inner astronomer. Your complete guide to amateur astronomy.