NGC 5286

NGC 5286
NGC 5286
	NGC 5286（中央）與半人馬M
觀測數據(J2000 曆元)
分類	V
星座	半人馬座
赤經	13h 46m 26.81s
赤緯	–51° 22′ 27.3″
距離	35.9 kly（11.0 kpc）
視星等 (V)	7.6
物理性質
Mass	7.13×105 M☉
金屬量	–1.41 dex
估計年齡	12.54 Gyr
其它名稱	科德韋爾 84
	參見：球狀星團，球狀星團表

NGC 5286，也稱為科德韋爾84，是由恆星組成的一個球狀星團，位置在半人馬座，距離地球35,900^[3]光年。在這個距離，來自這個星團的光經歷了星際氣體和塵埃的紅化，因此在UBV測光系統的E(B – V)=0.24星等。在這個星團的北方4角分有一顆裸眼可見的恆星半人馬M（4.65等）^[6]。它是蘇格蘭天文學家詹姆士·丹露帕在澳洲發現的，並且列在他於1827年編輯的星表內^[7]。

這個星團距離銀河中心29 kly（8.9 kpc），目前正在銀暈內環繞著銀河。它可能與麒麟座環，一個從矮星系形成但已經斷裂的恆星潮汐流，有所關聯。NGC 5286可能是銀河系內最古老的球狀星團^[6]，估計他的年齡是125.4億歲^[5]。它不是個完美的球形，投影有著0.12的扁率^[6]。

星團中心恆星的速度瀰散度是(8.1 ± 1.0) 公里/秒。根據在這個星團中心的恆星運動，它可能擁有的中介質量黑洞的質量不到星團質量的1%，而估計整個星團的質量上限是6,000太陽質量 ^[6]。

參考資料

^ Shapley, Harlow; Sawyer, Helen B., A Classification of Globular Clusters, Harvard College Observatory Bulletin, August 1927, (849): 11–14, Bibcode:1927BHarO.849...11S.
^ ^2.0 ^2.1 Goldsbury, Ryan; et al, The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters, The Astronomical Journal, December 2010, 140 (6): 1830–1837, Bibcode:2010AJ....140.1830G, arXiv:1008.2755 , doi:10.1088/0004-6256/140/6/1830.
^ ^3.0 ^3.1 Paust, Nathaniel E. Q.; et al, The ACS Survey of Galactic Globular Clusters. VIII. Effects of Environment on Globular Cluster Global Mass Functions, The Astronomical Journal, February 2010, 139 (2): 476–491, Bibcode:2010AJ....139..476P, doi:10.1088/0004-6256/139/2/476.
^ Boyles, J.; et al, Young Radio Pulsars in Galactic Globular Clusters, The Astrophysical Journal, November 2011, 742 (1): 51, Bibcode:2011ApJ...742...51B, arXiv:1108.4402 , doi:10.1088/0004-637X/742/1/51.
^ ^5.0 ^5.1 ^5.2 Forbes, Duncan A.; Bridges, Terry, Accreted versus in situ Milky Way globular clusters, Monthly Notices of the Royal Astronomical Society, May 2010, 404 (3): 1203–1214, Bibcode:2010MNRAS.404.1203F, arXiv:1001.4289 , doi:10.1111/j.1365-2966.2010.16373.x.
^ ^6.0 ^6.1 ^6.2 ^6.3 Feldmeier, A.; et al, Indication for an intermediate-mass black hole in the globular cluster NGC 5286 from kinematics, Astronomy & Astrophysics, June 2013, 554: A63, Bibcode:2013A&A...554A..63F, arXiv:1304.4176 , doi:10.1051/0004-6361/201321168.
^ O'Meara, Stephen James, The Caldwell Objects, Cambridge University Press: 337, 2002.

外部連結

NGC 5286（頁面存檔備份，存於網際網路檔案館） at Astrosurf
WikiSky上關於NGC 5286的內容：DSS2, SDSS, GALEX, IRAS, 氫α, X射線, 天文照片, 天圖, 文章和圖片

天文學目錄
NGC天體表：	NGC 5284 - NGC 5285 - NGC 5286 - NGC 5287 - NGC 5288
科德韋爾深空天體表：	C82 - C83 - C84 - C85 - C86

[hcob849_11-1] Shapley, Harlow; Sawyer, Helen B., A Classification of Globular Clusters, Harvard College Observatory Bulletin, August 1927, (849): 11–14, Bibcode:1927BHarO.849...11S.

[aj140_6_1830-2] 2.0 ^2.1 Goldsbury, Ryan; et al, The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters, The Astronomical Journal, December 2010, 140 (6): 1830–1837, Bibcode:2010AJ....140.1830G, arXiv:1008.2755 , doi:10.1088/0004-6256/140/6/1830.

[aj139_2_476-3] 3.0 ^3.1 Paust, Nathaniel E. Q.; et al, The ACS Survey of Galactic Globular Clusters. VIII. Effects of Environment on Globular Cluster Global Mass Functions, The Astronomical Journal, February 2010, 139 (2): 476–491, Bibcode:2010AJ....139..476P, doi:10.1088/0004-6256/139/2/476.

[apj742_1_51-4] Boyles, J.; et al, Young Radio Pulsars in Galactic Globular Clusters, The Astrophysical Journal, November 2011, 742 (1): 51, Bibcode:2011ApJ...742...51B, arXiv:1108.4402 , doi:10.1088/0004-637X/742/1/51.

[mnras404_3_1203-5] 5.0 ^5.1 ^5.2 Forbes, Duncan A.; Bridges, Terry, Accreted versus in situ Milky Way globular clusters, Monthly Notices of the Royal Astronomical Society, May 2010, 404 (3): 1203–1214, Bibcode:2010MNRAS.404.1203F, arXiv:1001.4289 , doi:10.1111/j.1365-2966.2010.16373.x.

[AAA554_A63-6] 6.0 ^6.1 ^6.2 ^6.3 Feldmeier, A.; et al, Indication for an intermediate-mass black hole in the globular cluster NGC 5286 from kinematics, Astronomy & Astrophysics, June 2013, 554: A63, Bibcode:2013A&A...554A..63F, arXiv:1304.4176 , doi:10.1051/0004-6361/201321168.

[OMeara2002-7] O'Meara, Stephen James, The Caldwell Objects, Cambridge University Press: 337, 2002.

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閱論編科德韋爾天體
列表	C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 C107 C108 C109
參看	梅西耶天體星雲和星團總表 NGC天體表赫歇爾目錄
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