HCG 87
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| HCG 87 | |
|---|---|
| Observation data (Epoch ) | |
| Constellation(s) | Capricornus |
| Right ascension | 20h 48m 11.9ss[1] |
| Declination | -19° 50′ 35″[1] |
| Number of galaxies | ~5 |
| See also: Galaxy groups and clusters, List of galaxy clusters | |
HCG 87 is a compact group of galaxies listed in the Hickson Compact Group Catalogue. This group is about 400 million light-years away [2] in the constellation Capricornus.
[edit] Members
| Name | Type[3] | R.A. (J2000)[3] | Dec. (J2000)[3] | Redshift (km/s)[3] | Apparent Magnitude[3] |
|---|---|---|---|---|---|
| HCG 87a | S0 pec | 20h 48m 15.0s | -19° 50′ 58″ | 8443 ± 14 | 15.3 |
| HCG 87b | SA(r)0 pec | 20h 48m 10.9s | -19° 51′ 23″ | 8740 ± 20 | 15.4 |
| HCG 87c | Sb | 20h 48m 12.0s | -19° 49′ 56″ | 8914 ± 7 | 16.1 |
| HCG 87d | Sd | 20h 48m 12.8s | -19° 50′ 46″ | 10200 ± 160 | 17.8 |
[edit] External links
- Astronomy Picture of the Day
- Galaxy Group HCG 87 - 2003 July 31
- HCG 87: A Small Group of Galaxies - 2010 July 6
- Close-ups of HCG 87
- Galactic Clusters
- Studies of Hickson Compact Groups
[edit] References
- ^ a b "NASA/IPAC Extragalactic Database". Results for HCG 87. http://nedwww.ipac.caltech.edu/. Retrieved 2006-10-19.
- ^ This redshift corresponds to a distance of 120Mpc or 400 million light years (using H0 = 75km/s/Mpc and q0 = 0.1). At the distance of the group, this corresponds to a group diameter of 52kpc, i.e., the group is approximately 170,000 light years across.
- ^ a b c d e "NASA/IPAC Extragalactic Database". Results for various galaxies. http://nedwww.ipac.caltech.edu/. Retrieved 2006-10-19.
Coordinates: 
20h 48m 11.9s, −19° 50′ 35″
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