Messier 91 (also known as NGC 4548) is a barred spiral galaxy about 63 million light-years away in the constellation Coma Berenices. It was most probably discovered by Charles Messier in 1781 and independently rediscovered by William Herschel on April 8, 1784. M91 is a member of the Virgo Cluster of galaxies.

Messier 91
Spiral Galaxy M91. Atlas Image courtesy of 2MASS/UMass/IPAC-Caltech/NASA/NSF.
Observation data (J2000 epoch)
ConstellationComa Berenices
Right ascension12h 35m 26.4s[1]
Declination+14° 29′ 47″[1]
Redshift486 ± 4 km/s[1]
Distance63 ± 16 Mly (19 ± 5 Mpc)[2]
Apparent dimensions (V)5′.4 × 4′.3[1]
Apparent magnitude (V)11.0[1]
Other designations
NGC 4548,[1] UGC 7753,[1] PGC 41934[1]

External links


  1. a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for NGC 4548. Retrieved 2006-12-13.
  2. J. L. Tonry, A. Dressler, J. P. Blakeslee, E. A. Ajhar, A. B. Fletcher, G. A. Luppino, M. R. Metzger, C. B. Moore (2001). "The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances". Astrophysical Journal. 546 (2): 681–693. doi:10.1086/318301.{{cite journal}}: CS1 maint: multiple names: authors list (link)