|Observation data (Epoch )|
|Right ascension||20h 48m 11.9ss|
|Declination||−19° 50′ 35″|
|Number of galaxies||~5|
|See also: Galaxy groups, Galaxy 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  in the constellation Capricornus. The group distinguishes itself as one of the most compact groups of galaxies, hosting two active galactic nuclei and a starburst among its three members, all of which show signs of interaction. This interaction, which astronomers have called visually, and scientifically, intriguing is being examined to understand the influence of active nuclei on star formation histories.
|Name||Type||R.A. (J2000)||Dec. (J2000)||Redshift (km/s)||Apparent Magnitude|
|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|
- Astronomy Picture of the Day
- Close-ups of HCG 87
- Galactic Clusters
- Studies of Hickson Compact Groups
- "NASA/IPAC Extragalactic Database". Results for HCG 87. 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.
- Noll, Keith. 07/1999. "Hubble Heritage observations of Hickson Compact Galaxy Group 87".
- English, J. et al. 05/2000. "A Minuet of Galaxies: Hickson Compact Group 87 as Viewed by the Hubble Space Telescope". American Astronomical Society, 195th AAS Meeting, #136.04; Bulletin of the American Astronomical Society, Vol. 32, p.884.
- "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-10-19.
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