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M72 (球状星团)

梅西耶 72
球状星团 球状星团表
观测资料
(历元 J2000)
分类
星座 宝瓶座
赤经 20h 53m 27.91s[1]
赤纬 -12° 32′ 13.4″[1]
距离 53-62 kly (16-19 kpc)
视星等 (V)
视直径(V)
物理性质
质量 ( M)
半径
VHB
估计年龄
附记 有一些蓝巨星
其他名称 NGC 6981, GCl 118[1]

梅西耶72(也称为M72NGC 6981)是在宝瓶座的一个球状星团,在1780年8月29日被皮埃尔·梅香发现。梅西耶随后也在10月4日和5日观测到,并将之编入星表中的第72号。当时这两位都认为他是一个暗淡的星云,而不是现在所认知的球状星团。即使使用10吋(25公分)口径的望远镜观察这个星团,依然只能看出模糊与微弱的影象,但使用20英寸的望远镜就能提高解像力。M72距离地球大约53,000光年,与银心也有一段的距离。但也有资料认为M72与地球的距离是62,000光年,直径为42光年。虽然一般的星团都有一些最老年的恒星,但M72拥有一些蓝巨星,因而被认为是一个年轻的星团。

外部链接

参考资料

  1. ^ 1.0 1.1 1.2 SIMBAD Astronomical Database. Results for NGC 6981. [2006-11-16]. (原始内容存档于2019-05-01). 
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M72 (球状星团)
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