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NGC 5286

Globular cluster in the constellation Centaurus

Summary

Globular cluster in the constellation Centaurus

Field	Value
name	NGC 5286
image	[[File:NGC_5286_hlsp_acsggct_hst_acs-wfc_R606_hst_13297_B336.png	250px]]
caption	NGC 5286 imaged by the Hubble Space Telescope
class	V
epoch	J2000
ra
dec
dist_ly	35.9 kly
size_v	4'
appmag_v	7.6
mass_msol
metal_fe	–1.41
age	12.54 Gyr
constellation	Centaurus
names	Caldwell 84

NGC 5286 (also known as Caldwell 84) is a globular cluster of stars located some 35,900 light years away in the constellation Centaurus. At this distance, the light from the cluster has undergone reddening from interstellar gas and dust equal to E(B – V) = 0.24 magnitude in the UBV photometric system. The cluster lies 4 arc-minutes north of the naked-eye star M Centauri. It was discovered by Scottish astronomer James Dunlop, active in Australia, and listed in his 1827 catalog.

This cluster is about 8.9 kpc from the Galactic Center and is currently orbiting in the Milky Way halo. It may be associated with the Monoceros Ring—a long tidal stream of stars that could have been formed from a disrupted dwarf galaxy. NGC 5286 may be one of the oldest globular clusters in the galaxy, with an estimated age of 12.54 billion years. It is not perfectly spherical, but has a projected ellipticity of 0.12.

The velocity dispersion of stars at the center of the cluster is (8.1 ± 1.0) km/s. Based upon the motions of stars at the core of this cluster, it may host an intermediate mass black hole with less than 1% of the cluster's mass. The upper limit for the mass estimate of this object is 6,000 times the mass of the Sun.

NGC 5286 is part of the Gaia Sausage, the hypothesised remains of a merged dwarf galaxy.

References

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References

(2018). "The Sausage Globular Clusters". The Astrophysical Journal.
(December 2010). "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters". The Astronomical Journal.
(August 1927). "A Classification of Globular Clusters". Harvard College Observatory Bulletin.
(May 2010). "Accreted versus in situ Milky Way globular clusters". [[Monthly Notices of the Royal Astronomical Society]].
(February 2010). "The ACS Survey of Galactic Globular Clusters. VIII. Effects of Environment on Globular Cluster Global Mass Functions". The Astronomical Journal.
(November 2011). "Young Radio Pulsars in Galactic Globular Clusters". The Astrophysical Journal.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

centaurus globular-clusters ngc-objects caldwell-objects gaia-enceladus

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