View source for HCG 87

{{Short description|Galaxy cluster in the constellation Capricornus}}
{{Galaxy cluster
| name = HCG 87
| image = HCG 87.png
| caption = Galaxy Group HCG 87
| credit = 
| distance = [[1 E24 m|400 million]]
| ra = {{RA|20|48|11.9s}}<ref name="ned">{{cite web
  | title=NASA/IPAC Extragalactic Database
  | work=Results for HCG 87
  | url=http://nedwww.ipac.caltech.edu/
  | access-date=2006-10-19 }}</ref>
| dec = {{DEC|-19|50|35}}<ref name="ned" />
| redshift = 8874 km/[[second|s]]<ref name="ned" />
| constellation = [[Capricornus]]
| member_no = ~5
| notes = 
| other_names = 
| names = 
}}

'''HCG 87''' is a compact [[group of galaxies]] listed in the [[Hickson Compact Group]] Catalogue.  This group is about [[1 E24 m|400 million]] [[light-year]]s away <ref>{{cite web |url=http://heritage.stsci.edu/1999/31/hicktable.ps |title=This redshift corresponds to a distance of 120Mpc or 400 million light years (using H<sub>0</sub> = 75km/s/Mpc and q<sub>0</sub> = 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 |url-status=dead |archive-date=19 February 2020 |archive-url=https://web.archive.org/web/20200219030953/http://heritage.stsci.edu/1999/31/hicktable.ps |quote=PS File download need Photoshop or GIMP }}</ref> in the [[constellation]] [[Capricornus]]. 
The group distinguishes itself as one of the most compact groups of galaxies, hosting two [[Active galactic nucleus|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>[[Jayanne English|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==

{| class="wikitable" style="text-align:center;border-collapse:collapse;" cellpadding="2"
|+'''Members of the HCG 87'''
|-
! style="background:#efefef;" | Name
! style="background:#efefef;" | [[Galaxy morphological classification|Type]]<ref name="ned2">{{cite web
  | title=NASA/IPAC Extragalactic Database
  | work=Results for various galaxies
  | url=http://nedwww.ipac.caltech.edu/
  | accessdate=2006-10-19}}</ref>
! style="background:#efefef;" | [[Right Ascension|R.A.]] ([[J2000]])<ref name="ned2" />
! style="background:#efefef;" | [[Declination|Dec.]] ([[J2000]])<ref name="ned2" />
! style="background:#efefef;" | [[Redshift]] (km/[[second|s]])<ref name="ned2" />
! style="background:#efefef;" | [[Apparent Magnitude]]<ref name="ned2" />
|- 
| [[HCG 87a]]
| S0 pec
| {{RA|20|48|15.0}}
| {{DEC|-19|50|58}}
| 8443 ± 14
| 15.3
|-
| [[HCG 87b]]
| SA(r)0 pec
| {{RA|20|48|10.9}}
| {{DEC|-19|51|23}}
| 8740 ± 20
| 15.4
|-
| [[HCG 87c]]
| Sb
| {{RA|20|48|12.0}}
| {{DEC|-19|49|56}}
| 8914 ± 7
| 16.1
|-
| [[HCG 87d]]
| Sd
| {{RA|20|48|12.8}}
| {{DEC|-19|50|46}}
| 10200 ± 160
| 17.8
|-
|}

==External links==
*[[Astronomy Picture of the Day]]
**[http://antwrp.gsfc.nasa.gov/apod/ap030731.html Galaxy Group HCG 87] – 2003 July 31
**[http://apod.nasa.gov/apod/ap100706.html HCG 87: A Small Group of Galaxies] – 2010 July 6 
*[http://heritage.stsci.edu/1999/31/closeup.html Close-ups of HCG 87]
*[https://web.archive.org/web/20060503230456/http://www.cosmiclight.com/imagegalleries/gclusters.htm Galactic Clusters]
*[http://heritage.stsci.edu/1999/31/supplemental.html Studies of Hickson Compact Groups]

==References==
{{reflist}}

{{Sky|20|48|11.9|-|19|50|35|400000000}}
{{Capricornus}}
{{galaxy}}

{{DEFAULTSORT:HCG 87}}
[[Category:Hickson Compact Groups|87]]
[[Category:Galaxy clusters]]
[[Category:Capricornus]]

{{galaxy-stub}}