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M47 (疏散星團)

M 47
觀測資料 (J2000.0 曆元)
赤經07h 36.6m[1]
赤緯-14° 30′[1]
距離498 pc[1]
視星等 (V)4.2
視大小 (V)30.0′
物理特徵
質量453[1] M
半徑10.61 pc[1]
估計年齡7,800萬年
其他特徵NGC 2422、Cr 152
相關條目:疏散星团NGC天體表

M47 (Messier 47NGC 2422)是位於南天星座船尾座中的一個疏散星團。早在1654年之前,義大利天文學家喬凡尼·巴蒂斯塔·霍迪納英语Giovanni Battista Hodierna就發現它了,後來查爾斯·梅西耶又於1771年2月19日獨立重新再發現該天體。但由於紀錄上的錯誤,又再一次的被發現;現在常用的名稱是NGC 2422。

梅西耶是使用 弧矢增八(船尾座2,船尾座k)做為參考星來標示指示M47的赤經赤緯位置。然而在該位置上沒有星團,因此M47曾被認為是一個遺失的梅西耶天體。但是,如果改變緯度的正負號,就發現位置是正確的[2]。Oswald Thomas在1934年就已經發現梅西耶在這方面的錯誤,而加拿大天文學家T.F.Morris直到1959年才意識到這一點[3]

M47的中心距離地球大約1,600光年,年齡約是7,800萬年。測量到的成員有視星等19等的紅矮星,成員數量大約是500顆[1],最亮的是HD 60855,是顆5.7等的Be星。星團的主要成員是B型主序星巨星,與最亮的紅巨星形成明顯的顏色對比[3]

它與更古老、更遙遠的M46相距大約1.3度[3]

參考資料預註解

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 Prisinzano, L; Micela, G; Sciortino, S; Favata, F. Luminosity and Mass Function of the Galactic open cluster NGC 2422. Astronomy & Astrophysics. 2003, 404 (3): 927–938. Bibcode:2003A&A...404..927P. arXiv:astro-ph/0304321可免费查阅. doi:10.1051/0004-6361:20030524. 
  2. ^ Houston, Walter Scott. Deep-Sky Wonders. Sky Publishing Corporation. 2005. ISBN 978-1-931559-23-2. 
  3. ^ 3.0 3.1 3.2 The hot blue stars of messier 47. ScienceDaily. 17 December 2014 [2021-03-19]. (原始内容存档于2017-12-01). 

外部連結

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M47 (疏散星團)
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