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 <ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> 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.<ref>Noll, Keith. 07/1999. "Hubble Heritage observations of Hickson Compact Galaxy Group 87".</ref> This interaction, which astronomers have called visually, and scientifically, intriguing<ref>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.</ref> is being examined to understand the influence of active nuclei on star formation histories.

Members

Members of the HCG 87

Name	Type<ref name="ned2">{{#invoke:citation/CS1|citation	CitationClass=web }}</ref>	R.A. (J2000)<ref name="ned2" />	Dec. (J2000)<ref name="ned2" />	Redshift (km/s)<ref name="ned2" />	Apparent Magnitude<ref name="ned2" />
HCG 87a	S0 pec	Template:RA	Template:DEC	8443 ± 14	15.3
HCG 87b	SA(r)0 pec	Template:RA	Template:DEC	8740 ± 20	15.4
HCG 87c	Sb	Template:RA	Template:DEC	8914 ± 7	16.1
HCG 87d	Sd	Template:RA	Template:DEC	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