NGC 4631 Group

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NGC 4631 Group
Observation data (Epoch J2000)
Constellation(s) Canes Venatici
& Coma Berenices
Right ascension 12h 09m[1][2]
Declination +30° 02′[1][2]
Brightest member NGC 4631[2][3]
Number of galaxies 5-27[1][2][4][3]
Other designations
LGG 291,[1] NOGG H611,[2]
NOGG P1 631,[2] NOGG P2 642[2]
See also: Galaxy groups, Galaxy clusters, List of galaxy clusters

The NGC 4631 Group is a poorly defined group of galaxies, about 25 million light years from Earth in the Coma Berenices and Canes Venatici constellations.

The NGC 4631 Group is one of many that lie within the Virgo Supercluster.[3]


Aside from these four galaxies, however, the determination of group membership is quite variable. The group lies in a relatively crowded part of the sky near the Virgo Cluster, so exact determination of the group membership is extremely difficult. Some studies have estimated that the NGC 4631 Group contains as few as 5 galaxies,[4] while others place the estimate as high as 27.[2] Additionally, it is unclear as to whether the galaxies near NGC 4631 and NGC 4656/NGC4657 form one large group or two smaller groups.[1]

See also[edit]


  1. ^ a b c d e A. M. Garcia (1993). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement. 100: 47–90. Bibcode:1993A&AS..100...47G. 
  2. ^ a b c d e f g h G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140Freely accessible. Bibcode:2000ApJ...543..178G. doi:10.1086/317070. 
  3. ^ a b c d P. Fouque; E. Gourgoulhon; P. Chamaraux; G. Paturel (1992). "Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F. 
  4. ^ a b R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge: Cambridge University Press. ISBN 0-521-35299-1. 
  5. ^ H. Arp (1966). "Atlas of Peculiar Galaxies". Astrophysical Journal Supplement. 14: 1–20. Bibcode:1966ApJS...14....1A. doi:10.1086/190147. 

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