// Workers AI · dad joke modeWhat did HCG 87 say to its galaxy friend? "You're a cluster.

HCG 87
HCG 87
	Galaxy Group HCG 87
Observation data (Epoch )
Constellation	Capricornus
Right ascension	20h 48m 11.9ss
Declination	−19° 50′ 35″
Number of galaxies	~5
Redshift	8,874 km/s
Distance	400 million

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.

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	20^h 48^m 15.0^s	−19° 50′ 58″	8443 ± 14	15.3
HCG 87b	SA(r)0 pec	20^h 48^m 10.9^s	−19° 51′ 23″	8740 ± 20	15.4
HCG 87c	Sb	20^h 48^m 12.0^s	−19° 49′ 56″	8914 ± 7	16.1
HCG 87d	Sd	20^h 48^m 12.8^s	−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

References

1 2 3 "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". Archived from the original on 19 February 2020. PS File download need Photoshop or GIMP
↑ 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.
1 2 3 4 5 "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-10-19.

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[ned-1] 1 2 3 "NASA/IPAC Extragalactic Database". Results for HCG 87. Retrieved 2006-10-19.

[2] "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". Archived from the original on 19 February 2020. PS File download need Photoshop or GIMP

[3] Noll, Keith. 07/1999. "Hubble Heritage observations of Hickson Compact Galaxy Group 87".

[4] 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.

[ned2-5] 1 2 3 4 5 "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-10-19.

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// Workers AI · dad joke modeWhat did HCG 87 say to its galaxy friend? "You're a cluster.

Members

External links

References