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梅西耶69

M 69
哈伯太空望遠鏡拍攝的M69;視場3.5弧分
Credit: NASA/STScI/WikiSky
觀測數據(J2000 曆元)
分類V[1]
星座人馬座
赤經18h 31m 23.10s[2]
赤緯−32° 20′ 53.1″[2]
距離29 kly(8.8 kpc)[3]
視星等 (V)+8.31[4]
視直徑(V)10′.8[3]
物理性質
Mass2.0×105 M[5] M
半徑45 ly[6]
金屬量–0.78[7] dex
估計年齡13.06 Gyr[7]
其它名稱GCl 96, M69, NGC 6637[4]

M69梅西耶69,也稱為NGC 6637,是在人馬座南側的一個球狀星團.[a]。它的位置在箕宿三(人馬座ε)東北方2.5度,在口徑50mm的雙筒望遠鏡中隱約可見。梅西耶在1780年8月31日發現它,當晚它同時也發現了另一個球狀星團M70。當時,他正在尋找尼可拉·路易·拉卡伊在1751-2年間於南非觀測時所描述的天體,並認為重新發現了它,但並不清楚拉卡伊描述的是否就是M69[8]

M69距離地球28,700光年[3],距離銀河核心5,200光年[9],在空間中的半徑為45光年[6]。它是一個金屬量相對豐富的球狀星團,很可能是核球的成員[10]。它的質量為200000 太陽質量,半質量半徑為11.6 ly[5],核心半徑為29.2 ly,潮汐半徑為91.9 ly[3]。它的中心有一個明亮的光度密度6,460 L·pc−3(表示每立方釐米)[9]。與它類似的近鄰,同為球狀星團M70之間的距離可能只有1,800光年[11]

圖集

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參考資料和註解

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  1. ^ 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. ^ 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可免费查阅, doi:10.1088/0004-6256/140/6/1830. 
  3. ^ 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可免费查阅, doi:10.1051/0004-6361/201322302, A53. 
  4. ^ 4.0 4.1 [ NGC 6637] 请检查|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. 
  5. ^ 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. ^ 6.0 6.1 From trigonometry: distance × sin( diameter_angle / 2 ) = 28,700 × 0.00157 = 45 ly. radius
  7. ^ 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可免费查阅, doi:10.1111/j.1365-2966.2010.16373.x. 
  8. ^ Thompson, Robert Bruce; Thompson, Barbara Fritchman, Illustrated Guide to Astronomical Wonders: From Novice to Master Observer, Maker Media, Inc., 2007, ISBN 978-1680451917 
  9. ^ 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可免费查阅, doi:10.1051/0004-6361:20020820. 
  10. ^ 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可免费查阅. 
  11. ^ 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). 
  12. ^ Cosmic riches. ESA/Hubble Picture of the Week. [3 October 2012]. (原始内容存档于2017-07-08). 
  1. ^ 在每天升起的天體中,無論是白天還是夜間,它在過子午線時要能達到15°以上高度角,才能詳細的觀察。因此,北緯43度線是能觀測這個星團的最北位置(90°減32°再減15°。)

外部連結

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梅西耶69
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