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[編輯]

^ 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[編輯]

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

天球赤道座標： 13^h 46^m 00^s，−51° 22′ 00″

[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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