NGC 5286

{{Short description|Globular cluster in the constellation Centaurus}} {{Infobox globular cluster | name = [[New General Catalogue|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<ref name=hcob849_11/> | epoch = [[J2000]] | ra = {{RA|13|46|26.81}}<ref name=aj140_6_1830/> | dec = {{DEC|–51|22|27.3}}<ref name=aj140_6_1830/> | dist_ly = {{Convert|35.9|kly|kpc|abbr=on|lk=on}}<ref name=aj139_2_476/> | size_v = 9.1' | appmag_v = 7.6 | mass_msol = {{Val|7.13|e=5}}<ref name=apj742_1_51/> | metal_fe = –1.41<ref name=mnras404_3_1203/> | age = 12.54 [[Gigayear|Gyr]]<ref name=mnras404_3_1203/> | constellation = [[Centaurus]] | names = [[Caldwell catalogue|Caldwell]] 84 }}

'''NGC 5286''' (also known as '''Caldwell 84''') is a [[globular cluster]] of [[star]]s located some 35,900<ref name=aj139_2_476/> [[light year]]s away in the [[constellation]] [[Centaurus]]. At this distance, the light from the cluster has undergone [[Extinction (astronomy)|reddening]] from interstellar gas and dust equal to {{nowrap|E(B – V)}} = 0.24 [[Magnitude (astronomy)|magnitude]] in the [[UBV photometric system]]. The cluster lies 4 [[arc-minute]]s north of the naked-eye star [[M Centauri]].<ref name="AAA554_A63"/> It was discovered by Scottish astronomer [[James Dunlop]], active in Australia, and listed in his 1827 catalog.<ref name="OMeara2002"/>

This cluster is about {{Convert|8.9|kpc|kly|abbr=on|disp=flip}} from the [[Galactic Center]] and is currently orbiting in the [[Milky Way]] [[Galactic halo|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,<ref name="AAA554_A63"/> with an estimated age of 12.54 billion years.<ref name=mnras404_3_1203/> It is not perfectly spherical, but has a projected [[ellipticity]] of 0.12.<ref name="AAA554_A63"/>

The [[velocity dispersion]] of stars at the center of the cluster is {{nowrap|(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 [[solar mass|mass of the Sun]].<ref name="AAA554_A63"/>

NGC 5286 is part of the [[Gaia Sausage]], the hypothesised remains of a merged dwarf galaxy.<ref>{{cite journal |last1=C. |first1=Myeong, G. |last2=W. |first2=Evans, N. |last3=V. |first3=Belokurov |last4=L. |first4=Sanders, J. |last5=E. |first5=Koposov, S. |title=The Sausage Globular Clusters |journal=The Astrophysical Journal |volume=863 |issue=2 |pages=L28 |date=2018 |language=en|bibcode=2018ApJ...863L..28M |arxiv=1805.00453 |doi=10.3847/2041-8213/aad7f7 |s2cid=67791285 |doi-access=free }}</ref>

==References== <references> <ref name="OMeara2002">{{Citation | first1 = Stephen James | last1 = O'Meara | title = The Caldwell Objects | publisher = [[Cambridge University Press]] | page = 337 | year = 2002 | url = https://books.google.com/books?id=3Hg6YHgx9nAC&pg=PA337 | postscript = . | isbn = 9780521827966 }}</ref>

<ref name="AAA554_A63">{{Citation | last1 = Feldmeier | first1 = A. | last2 = Lützgendorf | first2 = N. | last3 = Neumayer | first3 = N. | last4 = Kissler-Patig | first4 = M. | last5 = Gebhardt | first5 = K. | last6 = Baumgardt | first6 = H. | last7 = Noyola | first7 = E. | last8 = de Zeeuw | first8 = P. T. | last9 = Jalali | first9 = B. | display-authors = 1 | title = Indication for an intermediate-mass black hole in the globular cluster NGC 5286 from kinematics | journal = Astronomy & Astrophysics | volume = 554 | page = A63 |date=June 2013 | arxiv = 1304.4176 | bibcode = 2013A&A...554A..63F | doi = 10.1051/0004-6361/201321168 | s2cid = 55671623 | postscript = . }}</ref>

<ref name=aj140_6_1830>{{citation | display-authors=1 | 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 | title=The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters | journal=The Astronomical Journal | volume=140 | issue=6 | pages=1830–1837 |date=December 2010 | doi=10.1088/0004-6256/140/6/1830 | bibcode=2010AJ....140.1830G | postscript=. |arxiv = 1008.2755 | s2cid=119183070 }}</ref>

<ref name=hcob849_11>{{citation | last1=Shapley | first1=Harlow | last2=Sawyer | first2=Helen B. | title=A Classification of Globular Clusters | 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 | last1=Forbes | first1=Duncan A. | last2=Bridges | first2=Terry | title=Accreted versus in situ Milky Way globular clusters | 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 | bibcode=2010MNRAS.404.1203F | postscript=. |arxiv = 1001.4289 | s2cid=51825384 }}</ref>

<ref name=aj139_2_476>{{citation | display-authors=1 | last1=Paust | first1=Nathaniel E. Q. | last2=Reid | first2=I. Neill | last3=Piotto | first3=Giampaolo | last4=Aparicio | first4=Antonio | last5=Anderson | first5=Jay | last6=Sarajedini | first6=Ata | last7=Bedin | first7=Luigi R. | last8=Chaboyer | first8=Brian | last9=Dotter | first9=Aaron | last10=Hempel | first10=Maren | last11=Majewski | first11=Steven | last12=Marín-Franch | first12=A. | last13=Milone | first13=Antonino | last14=Rosenberg | first14=Alfred | last15=Siegel | first15=Michael | title=The ACS Survey of Galactic Globular Clusters. VIII. Effects of Environment on Globular Cluster Global Mass Functions | journal=The Astronomical Journal | volume= 139 | issue= 2 | pages= 476–491 |date=February 2010 | doi=10.1088/0004-6256/139/2/476 | bibcode=2010AJ....139..476P | postscript=. | hdl=2152/34371 | s2cid=120965440 | hdl-access=free }}</ref>

<ref name=apj742_1_51>{{citation | display-authors=1 | 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. | title=Young Radio Pulsars in Galactic Globular Clusters | journal=The Astrophysical Journal | volume=742 | issue=1 | page=51 |date=November 2011 | doi=10.1088/0004-637X/742/1/51 | bibcode=2011ApJ...742...51B | postscript=. |arxiv = 1108.4402 | s2cid=118649860 }}</ref> </references>

==External links== * {{cite web | title=Caldwell 84 | date=September 1, 2020 | work=Hubble's Caldwell Catalog | publisher=NASA | editor1-first=Michelle | editor1-last=Belleville | url=https://www.nasa.gov/feature/goddard/caldwell-84 | access-date=2020-12-21 }} * {{commonscat-inline}} * [http://www.astrosurf.com/antilhue/ngc5286.htm NGC 5286] at Astrosurf * {{WikiSky}}

{{DEFAULTSORT:Ngc 5286}} [[Category:Centaurus]] [[Category:Globular clusters]] [[Category:NGC objects|5286]] [[Category:Caldwell objects|084b]] [[Category: Gaia-Enceladus]]