Astronomy:NGC 5986
| NGC 5986 | |
|---|---|
 NGC 5986 by Hubble Space Telescope; 3.5′ view | |
| Observation data (J2000 epoch) | |
| Class | VII[1] |
| Constellation | Lupus |
| Right ascension | 15h 46m 03.00s[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 | [math]\displaystyle{ \begin{smallmatrix}\left[\ce{Fe}/\ce{H}\right]\end{smallmatrix} }[/math] = −1.35[5] dex |
| Estimated age | 12.16 Gyr[5] |
| Other designations | ESO 329-SC 018, NGC 5986[6][7] |
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]
Further reading
- Alves, David R. et al. (January 2001). "CCD Photometry of the Globular Cluster NGC 5986 and Its Post-Asymptotic Giant Branch and RR Lyrae Stars". The Astronomical Journal 121 (1): 318–326. doi:10.1086/318030. Bibcode: 2001AJ....121..318A.
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.
- ↑ 2.0 2.1 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, doi:10.1088/0004-6256/140/6/1830, Bibcode: 2010AJ....140.1830G.
- ↑ 3.0 3.1 3.2 Boyles, J. et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal 742 (1): 51, doi:10.1088/0004-637X/742/1/51, Bibcode: 2011ApJ...742...51B.
- ↑ 4.0 4.1 4.2 4.3 Johnson, Christian I. et al. (June 2017). "Chemical Complexity in the Eu-enhanced Monometallic Globular NGC 5986". The Astrophysical Journal 842 (1): 21. doi:10.3847/1538-4357/aa7414. 24. Bibcode: 2017ApJ...842...24J.
- ↑ 5.0 5.1 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, doi:10.1111/j.1365-2966.2010.16373.x, Bibcode: 2010MNRAS.404.1203F.
- ↑ "NASA/IPAC Extragalactic Database". Results for NGC 5986. http://nedwww.ipac.caltech.edu/.
- ↑ "NGC 5986". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5986.
- ↑ Seligman, Courtney. "New General Catalogue objects: NGC 5950 - 5999". https://cseligman.com/text/atlas/ngc59a.htm#5986.
- ↑ 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, doi:10.3847/1538-4357/aad810, 11, Bibcode: 2018ApJ...865...11L.
- ↑ 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. doi:10.1051/0004-6361/200810579. Bibcode: 2009A&A...498..737M.
External links
- NGC 5986 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
15h 46m 3.4s, −37° 47′ 10″
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