Messier 108 (also known as NGC 3556) is an edge-on w:spiral galaxy in the w:constellation Ursa Major. It was discovered by w:Pierre Méchain in 1781 or 1782.[4]

Messier 108
A w:Hubble Space Telescope (HST) image of M 108.
Credit: HST/w:NASA/w:ESA.
Observation data (w:J2000 epoch)
Constellationw:Ursa Major[1]
Right ascension11h 11m 31.0s[2]
Declination+55° 40′ 27″[2]
Redshift699 ± 9 km/s[2]
Distance14.1 Mpc[3]
Apparent dimensions (V)8′.7 × 2′.2[2]
Apparent magnitude (V)10.7[2]
Other designations
NGC 3556,[2] PGC 34030,[2] UGC 6225[2]
Amateur Image of Messier 108 Courtesy Hunter Wilson

External links


  1. R. W. Sinnott, editor (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN 0-933-34651-4. {{cite book}}: |author= has generic name (help)
  2. a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for NGC 3556. Retrieved 2007-06-21.
  3. Q. Daniel Wang et al., [ Chandra Observation of the Edge-on Galaxy NGC 3556 (M 108): Violent Galactic Disk-halo Interaction Revealed]
  4. Kepple, George Robert (1998). The Night Sky Observer's Guide, Volume 2. Willmann-Bell, Inc. p. 399. ISBN 0-943396-60-3. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)