{{Short description| Globular cluster in the constellation Lupus }} {{Infobox globular cluster | name = NGC 5986 | image = [[Image:NGC 5986 Hubble WikiSky.jpg|250px]] | caption = NGC 5986 by [[Hubble Space Telescope]]; 3.5{{prime}} view | credit = | epoch = [[J2000]] | class = VII<ref name=hcob849_11/> | constellation = [[Lupus (constellation)|Lupus]] | ra = {{RA|15|46|03.00}}<ref name=aj140_6_1830/> | dec = {{DEC|–37|47|11.1}}<ref name=aj140_6_1830/> | dist_ly = {{Convert|10.4|kpc|kly|1|order=flip|abbr=on|lk=on}}<ref name=apj742_1_51/> | appmag_v = 8.0 | absmag_v = −8.44<ref name=Johnson2017/> | size_v = 5' | mass_msol = {{Val|5.99|e=5}}<ref name=apj742_1_51/> | radius_ly = | radius_tidal_arcminsec = | v_hb = | metal_fe = −1.35<ref name=mnras404_3_1203/> | age = 12.16&nbsp;[[Gigayear|Gyr]]<ref name=mnras404_3_1203/> | notes = | names = ESO 329-SC 018, [[New General Catalogue|NGC]] 5986<ref name="ned" /><ref name=SIMBAD/> }}

'''NGC 5986''' is a [[globular cluster]] of stars in the southern [[constellation]] of [[Lupus (constellation)|Lupus]], located at a distance of approximately {{Convert|10.4|kpc|kly|disp=out|abbr=off|lk=on}} from the [[Sun]].<ref name=apj742_1_51/> It was discovered by Scottish astronomer [[James Dunlop]] on May 10, 1826. [[John Louis Emil Dreyer|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".<ref name=cseligman/> Its prograde–retrograde orbit through the [[Milky Way]] galaxy is considered irregular and highly eccentric. It has a mean heliocentric [[radial velocity]] of +100&nbsp;km/s.<ref name=Johnson2017/> The galacto-centric distance is {{convert|5.2|kpc|kly|order=flip|abbr=on|lk=on}}, which puts it in the galaxy's inner halo.<ref name=Ortolani2000/>

This is relatively massive cluster has been poorly studied, at least as of 2017.<ref name=Johnson2017/> It is moderately concentrated, with a [[core radius]] of {{val|28.2|ul=arcsecond}} and a projected half-light radius of {{val|58.8|u=arcsecond}}. The three dimensional half-mass radius is {{val|78.16|u=arcsecond|p=~}}.<ref name=Lanzoni2018/> 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.<ref name=Bidin2009/> 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.<ref name=Johnson2017/>

==Further reading== * {{cite journal | title=CCD Photometry of the Globular Cluster NGC 5986 and Its Post-Asymptotic Giant Branch and RR Lyrae Stars | display-authors=1 | last1=Alves | first1=David R. | last2=Bond | first2=Howard E. | last3=Onken | first3=Christopher | journal=The Astronomical Journal | volume=121 | issue=1 | pages=318–326 | date=January 2001 | arxiv=astro-ph/0010095 | bibcode=2001AJ....121..318A | doi=10.1086/318030 | s2cid=119093584 }}

==References== <references> <ref name=SIMBAD>{{cite simbad | title=NGC 5986 | access-date=2020-02-25 }}</ref>

<ref name=cseligman>{{cite web | url=https://cseligman.com/text/atlas/ngc59a.htm#5986 | title=New General Catalogue objects: NGC 5950 - 5999 | last=Seligman | first=Courtney | website=cseligman.com | access-date=2020-09-20 }}</ref>

<ref name=Ortolani2000>{{cite journal | title=Colour-magnitude diagrams of the inner halo globular clusters NGC 5986 and NGC 6712 | display-authors=1 | last1=Ortolani | first1=S. | last2=Momany | first2=Y. | last3=Barbuy | first3=B. | last4=Bica | first4=E. | last5=Catelan | first5=M. | journal=Astronomy and Astrophysics | volume=362 | pages=953–958 | date=October 2000 | bibcode=2000A&A...362..953O }}</ref>

<ref name=Bidin2009>{{cite journal | title=A lack of close binaries among hot horizontal branch stars in globular clusters. M 80 and NGC 5986 | display-authors=1 | last1=Moni Bidin | first1=C. | last2=Moehler | first2=S. | last3=Piotto | first3=G. | last4=Momany | first4=Y. | last5=Recio-Blanco | first5=A. | journal=Astronomy and Astrophysics | volume=498 | issue=3 | pages=737–751 | date=May 2009 | arxiv=0903.2072 | bibcode=2009A&A...498..737M | doi=10.1051/0004-6361/200810579 | s2cid=16080323 }}</ref>

<ref name=Johnson2017>{{cite journal | title=Chemical Complexity in the Eu-enhanced Monometallic Globular NGC 5986 | display-authors=1 | last1=Johnson | first1=Christian I. | last2=Caldwell | first2=Nelson | last3=Rich | first3=R. Michael | last4=Mateo | first4=Mario | last5=Bailey | first5=John I., III | last6=Olszewski | first6=Edward W. | last7=Walker | first7=Matthew G. | journal=The Astrophysical Journal | volume=842 | issue=1 | id=24 | pages=21 | date=June 2017 | arxiv=1705.10840 | bibcode=2017ApJ...842...24J | doi=10.3847/1538-4357/aa7414 | s2cid=119279995 | doi-access=free }}</ref>

<ref name=Lanzoni2018>{{citation | title=The ESO Multi-instrument Kinematic Survey (MIKiS) of Galactic Globular Clusters: Solid-body Rotation and Anomalous Velocity Dispersion Profile in NGC 5986 | last1=Lanzoni | first1=B. | last2=Ferraro | first2=F. R. | last3=Mucciarelli | first3=A. | last4=Pallanca | first4=C. | last5=Tiongco | first5=M. A. | last6=Varri | first6=A. | last7=Vesperini | first7=E. | last8=Bellazzini | first8=M. | last9=Dalessandro | first9=E. | last10=Origlia | first10=L. | last11=Valenti | first11=E. | last12=Sollima | first12=A. | last13=Lapenna | first13=E. | last14=Beccari | first14=G. | display-authors=1 | journal=The Astrophysical Journal | volume=865 | issue=1 | id=11 | pages=9 | date=September 2018 | arxiv=1808.01194 | bibcode=2018ApJ...865...11L | doi=10.3847/1538-4357/aad810 | s2cid=119414659 | postscript=. | doi-access=free }}</ref>

<ref name=aj140_6_1830>{{citation | title=The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters | last1=Goldsbury | first1=Ryan | last2=Richer | first2=Harvey B. | last3=Anderson | first3=Jay | last4=Dotter | first4=Aaron | last5=Sarajedini | first5=Ata | last6=Woodley | first6=Kristin | display-authors=1 | journal=The Astronomical Journal | volume=140 | issue=6 | pages=1830–1837 |date=December 2010 | doi=10.1088/0004-6256/140/6/1830 | postscript=. | bibcode=2010AJ....140.1830G | arxiv=1008.2755 | s2cid=119183070 }}</ref>

<ref name=hcob849_11>{{citation | title=A Classification of Globular Clusters | last1=Shapley | first1=Harlow | last2=Sawyer | first2=Helen B. | journal=Harvard College Observatory Bulletin | volume=849 | issue=849 | pages=11–14 | date=August 1927 | bibcode=1927BHarO.849...11S | postscript=. }}</ref>

<ref name=mnras404_3_1203>{{citation | title=Accreted versus in situ Milky Way globular clusters | last1=Forbes | first1=Duncan A. | last2=Bridges | first2=Terry | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=404 | issue=3 | pages=1203–1214 | date=May 2010 | doi=10.1111/j.1365-2966.2010.16373.x | doi-access=free | postscript=. | bibcode=2010MNRAS.404.1203F | arxiv=1001.4289 | s2cid=51825384 }}</ref>

<ref name=apj742_1_51>{{citation | title=Young Radio Pulsars in Galactic Globular Clusters | last1=Boyles | first1=J. | last2=Lorimer | first2=D. R. | last3=Turk | first3=P. J. | last4=Mnatsakanov | first4=R. | last5=Lynch | first5=R. S. | last6=Ransom | first6=S. M. | last7=Freire | first7=P. C. | last8=Belczynski | first8=K. | display-authors=1 | journal=The Astrophysical Journal | volume=742 | issue=1 | page=51 |date=November 2011 | doi=10.1088/0004-637X/742/1/51 | postscript=. | bibcode=2011ApJ...742...51B | arxiv=1108.4402 | s2cid=118649860 }}</ref>

<ref name="ned">{{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 5986 | url=http://nedwww.ipac.caltech.edu/ | access-date=2007-04-06 }}</ref> </references> {{commons category}}

==External links== * {{commons category-inline}} * {{WikiSky}}

{{Sky|15|46|3.4|-|37|47|10|1}} {{Ngc60}}{{Lupus (constellation)}}

[[Category:Globular clusters]] [[Category:Lupus (constellation)]] [[Category:NGC objects|5986]]