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M47 (疏散星团)

M 47
观测资料 (J2000.0 历元)
赤经07h 36.6m[1]
赤纬-14° 30′[1]
距离498 pc[1]
视星等 (V)4.2
视大小 (V)30.0′
物理特征
质量453[1] M
半径10.61 pc[1]
估计年龄7,800万年
其他特征NGC 2422、Cr 152
相关条目:疏散星团NGC天体表

M47 (Messier 47NGC 2422)是位于南天星座船尾座中的一个疏散星团。早在1654年之前,意大利天文学家乔凡尼·巴蒂斯塔·霍迪纳英语Giovanni Battista Hodierna就发现它了,后来查尔斯·梅西耶又于1771年2月19日独立重新再发现该天体。但由于纪录上的错误,又再一次的被发现;现在常用的名称是NGC 2422。

梅西耶是使用 弧矢增八(船尾座2,船尾座k)做为参考星来标示指示M47的赤经赤纬位置。然而在该位置上没有星团,因此M47曾被认为是一个遗失的梅西耶天体。但是,如果改变纬度的正负号,就发现位置是正确的[2]。Oswald Thomas在1934年就已经发现梅西耶在这方面的错误,而加拿大天文学家T.F.Morris直到1959年才意识到这一点[3]

M47的中心距离地球大约1,600光年,年龄约是7,800万年。测量到的成员有视星等19等的红矮星,成员数量大约是500颗[1],最亮的是HD 60855,是颗5.7等的Be星。星团的主要成员是B型主序星巨星,与最亮的红巨星形成明显的颜色对比[3]

它与更古老、更遥远的M46相距大约1.3度[3]

参考资料预注解

  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). 

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M47 (疏散星团)
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