HCG 87

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. 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.^[3] This interaction, which astronomers have called visually, and scientifically, intriguing^[4] is being examined to understand the influence of active nuclei on star formation histories.

HCG 87
Galaxy Group HCG 87
Observation data (Epoch )
Constellation(s)	Capricornus
Right ascension	20h 48m 11.9ss[1]
Declination	−19° 50′ 35″[1]
Number of galaxies	~5
Redshift	8874 km/s[1]
Distance	400 million

Members

Members of the HCG 87

Name	Type[5]	R.A. (J2000)[5]	Dec. (J2000)[5]	Redshift (km/s)[5]	Apparent Magnitude[5]
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

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