梅西耶69
| M 69 | |
|---|---|
 | |
| 观测数据(J2000 历元) | |
| 分类 | V[1] |
| 星座 | 人马座 |
| 赤经 | 18h 31m 23.10s[2] |
| 赤纬 | −32° 20′ 53.1″[2] |
| 距离 | 29 kly（8.8 kpc）[3] |
| 视星等 (V) | +8.31[4] |
| 视直径(V) | 10′.8[3] |
| 物理性质 | |
| Mass | 2.0×105 M☉[5] M☉ |
| 半径 | 45 ly[6] |
| 金属量 | –0.78[7] dex |
| 估计年龄 | 13.06 Gyr[7] |
| 其它名称 | GCl 96, M69, NGC 6637[4] |
M69或梅西耶69，也称为NGC 6637，是在人马座南侧的一个球状星团.[a]。它的位置在箕宿三(人马座ε)东北方2.5度，在口径50mm的双筒望远镜中隐约可见。梅西耶在1780年8月31日发现它，当晚它同时也发现了另一个球状星团M70。当时，他正在寻找尼可拉·路易·拉卡伊在1751-2年间于南非观测时所描述的天体，并认为重新发现了它，但并不清楚拉卡伊描述的是否就是M69[8]。
M69距离地球28,700光年[3]，距离银河核心5,200光年[9]，在空间中的半径为45光年[6]。它是一个金属量相对丰富的球状星团，很可能是核球的成员[10]。它的质量为200000 太阳质量，半质量半径为11.6 ly[5]，核心半径为29.2 ly，潮汐半径为91.9 ly[3]。它的中心有一个明亮的光度密度6,460 L☉·pc−3（表示每立方厘米）[9]。与它类似的近邻，同为球状星团的M70之间的距离可能只有1,800光年[11]。
图集
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![就球状星团而言，M69是有记录以来金属量最高的星团之一[12]。](https://upload.wikimedia.org/wikipedia/commons/thumb/2/23/Messier_69_Hubble_WikiSky.jpg/120px-Messier_69_Hubble_WikiSky.jpg)
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以箭头指示M69位置的星图 (罗伯托·穆拉) 。
![就球状星团而言，M69是有记录以来金属量最高的星团之一[12]。](/zh-sg/File:Messier_69_Hubble_WikiSky.jpg)
参考资料和注解
- ^ Shapley, Harlow; Sawyer, Helen B., A Classification of Globular Clusters, Harvard College Observatory Bulletin, August 1927, 849 (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 3.2 3.3 Kharchenko, N. V.; et al, Global survey of star clusters in the Milky Way. II. The catalogue of basic parameters, Astronomy and Astrophysics, 2013, 558: 8, Bibcode:2013A&A...558A..53K, S2CID 118548517, arXiv:1308.5822 , doi:10.1051/0004-6361/201322302, A53.
- ^ 4.0 4.1 [ NGC 6637] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. - ^ 5.0 5.1 Mandushev, G.; et al, Dynamical masses for galactic globular clusters, Astronomy and Astrophysics, December 1991, 252: 94, Bibcode:1991A&A...252...94M.
- ^ 6.0 6.1 From trigonometry: distance × sin( diameter_angle / 2 ) = 28,700 × 0.00157 = 45 ly. radius
- ^ 7.0 7.1 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, S2CID 51825384, arXiv:1001.4289 , doi:10.1111/j.1365-2966.2010.16373.x.
- ^ Thompson, Robert Bruce; Thompson, Barbara Fritchman, Illustrated Guide to Astronomical Wonders: From Novice to Master Observer, Maker Media, Inc., 2007, ISBN 978-1680451917
- ^ 9.0 9.1 Piotto, G.; et al, HST color-magnitude diagrams of 74 galactic globular clusters in the HST F439W and F555W bands, Astronomy and Astrophysics, September 2002, 391 (3): 945–965, Bibcode:2002A&A...391..945P, S2CID 17333985, arXiv:astro-ph/0207124 , doi:10.1051/0004-6361:20020820.
- ^ Heasley, J. N.; et al, Hubble Space Telescope Photometry of the Metal-rich Globular Clusters NGC 6624 and NGC 6637, The Astronomical Journal, August 2000, 120 (2): 879–893, Bibcode:2000AJ....120..879H, doi:10.1086/301461 .
- ^ Frommert, Hartmut; Kronberg, Christine, Globular Cluster M69, SEDS Messier pages (Students for the Exploration and Development of Space (SEDS)), July 20, 2011 [2018-12-03], （原始内容存档于2015-04-21）.
- ^ Cosmic riches. ESA/Hubble Picture of the Week. [3 October 2012]. （原始内容存档于2017-07-08）.
外部链接
- Messier 69, Galactic Globular Clusters Database page （页面存档备份，存于互联网档案馆）
- WikiSky上关于梅西耶69的内容：DSS2, SDSS, GALEX, IRAS, 氢α, X射线, 天文照片, 天图, 文章和图片
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