NGC 4631 Group
From Infogalactic: the planetary knowledge core
| 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.
Contents
Members
- spiral galaxy NGC 4631 (Whale Galaxy), brightest galaxy in the group [3]
- interacting galaxies NGC 4656 and NGC 4657 (Hockey Stick Galaxies)
- dwarf elliptical galaxy NGC 4627, which is a companion of NGC 4631,[5] is also by default a member of the group, although it is not listed in most catalogs
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
Virgo Cluster - a large cluster of galaxies that is near the NGC 4631 group
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- The Whale and the Hockey Stick Astronomy Picture of the Day of 2009 August 21
