NGC 5986

Globular cluster in the constellation Lupus

NGC 5986
NGC 5986 by Hubble Space Telescope; 3.5′ view
Observation data (J2000 epoch)
Class	VII^[1]
Constellation	Lupus
Right ascension	15^h 46^m 03.00^s^[2]
Declination	–37° 47′ 11.1″^[2]
Distance	33.9 kly (10.4 kpc)^[3]
Apparent magnitude (V)	8.0
Apparent dimensions (V)	5'
Physical characteristics
Absolute magnitude	−8.44^[4]
Mass	5.99×10⁵^[3] `M`_☉
Metallicity	${\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}$ = −1.35^[5] dex
Estimated age	12.16 Gyr^[5]
Other designations	ESO 329-SC 018, NGC 5986^[6]^[7]
See also: Globular cluster, List of globular clusters

NGC 5986 is a globular cluster of stars in the southern constellation of Lupus, located at a distance of approximately 34 kilolight-years from the Sun.^[3] It was discovered by Scottish astronomer James Dunlop on May 10, 1826. John L. E. Dreyer described it as, "a remarkable object, a globular cluster, very bright, large, round, very gradually brighter middle, stars of 13th to 15th magnitude".^[8] Its prograde–retrograde orbit through the Milky Way galaxy is considered irregular and highly eccentric. It has a mean heliocentric radial velocity of +100 km/s.^[4] The galacto-centric distance is 17 kly (5.2 kpc), which puts it in the galaxy's inner halo.^[9]

This is relatively massive cluster has been poorly studied, at least as of 2017.^[4] It is moderately concentrated, with a core radius of 28.2″ and a projected half-light radius of 58.8″. The three dimensional half-mass radius is ~78.16″.^[10] The cluster has a higher metallicity – what astronomers term the abundance of elements with higher atomic number then helium – compared to most other objects of its type.^[11] It may have at least 4–5 different stellar populations with distinct elemental compositions, and there is evidence that it has lost ~60–80% of its original mass.^[4]

References

^ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin, 849 (849): 11–14, Bibcode:1927BHarO.849...11S.
^ ^a ^b Goldsbury, Ryan; et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830–1837, arXiv:1008.2755, Bibcode:2010AJ....140.1830G, doi:10.1088/0004-6256/140/6/1830, S2CID 119183070.
^ ^a ^b ^c Boyles, J.; et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal, 742 (1): 51, arXiv:1108.4402, Bibcode:2011ApJ...742...51B, doi:10.1088/0004-637X/742/1/51, S2CID 118649860.
^ ^a ^b ^c ^d Johnson, Christian I.; et al. (June 2017). "Chemical Complexity in the Eu-enhanced Monometallic Globular NGC 5986". The Astrophysical Journal. 842 (1): 21. arXiv:1705.10840. Bibcode:2017ApJ...842...24J. doi:10.3847/1538-4357/aa7414. S2CID 119279995. 24.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ ^a ^b Forbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters", Monthly Notices of the Royal Astronomical Society, 404 (3): 1203–1214, arXiv:1001.4289, Bibcode:2010MNRAS.404.1203F, doi:10.1111/j.1365-2966.2010.16373.x, S2CID 51825384.
^ "NASA/IPAC Extragalactic Database". Results for NGC 5986. Retrieved 2007-04-06.
^ "NGC 5986". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-25.
^ Seligman, Courtney. "New General Catalogue objects: NGC 5950 - 5999". cseligman.com. Retrieved 2020-09-20.
^ Ortolani, S.; et al. (October 2000). "Colour-magnitude diagrams of the inner halo globular clusters NGC 5986 and NGC 6712". Astronomy and Astrophysics. 362: 953–958. Bibcode:2000A&A...362..953O.
^ Lanzoni, B.; et al. (September 2018), "The ESO Multi-instrument Kinematic Survey (MIKiS) of Galactic Globular Clusters: Solid-body Rotation and Anomalous Velocity Dispersion Profile in NGC 5986", The Astrophysical Journal, 865 (1): 9, arXiv:1808.01194, Bibcode:2018ApJ...865...11L, doi:10.3847/1538-4357/aad810, S2CID 119414659, 11.
^ Moni Bidin, C.; et al. (May 2009). "A lack of close binaries among hot horizontal branch stars in globular clusters. M 80 and NGC 5986". Astronomy and Astrophysics. 498 (3): 737–751. arXiv:0903.2072. Bibcode:2009A&A...498..737M. doi:10.1051/0004-6361/200810579. S2CID 16080323.

Wikimedia Commons has media related to NGC 5986.

External links

Media related to NGC 5986 at Wikimedia Commons
NGC 5986 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images