Astronomy Picture of the Day——毕宿星团

The Hyades Star Cluster 
Image Credit & Copyright: Jose Mtanous

Explanation: It is the closest cluster of stars to the Sun. The Hyades open cluster is bright enough to have been remarked on even thousands of years ago, yet is not as bright or compact as the nearby Pleiades (M45) star cluster. Pictured here is a particularly deep image of the Hyades which has brings out vivid star colors and faint coincidental nebulas. The brightest star in the field is yellow Aldebaran, the eye of the bull toward the constellation of Taurus. Aldebaran, at 65 light-years away, is now known to be unrelated to the Hyadescluster, which lies about 150 light-years away. The central Hyades stars are spread out over about 15 light-years. Formed about 625 million years ago, the Hyades likely shares a common origin with the Beehive cluster (M44), a naked-eye open star cluster toward the constellation of Cancer, based on M44's motion through space and remarkably similar age

毕宿星团

这是距离太阳最近的一个星团，尽管它不如昴星团明亮和紧凑，但毕宿这个疏散星团的亮度在几千年前就引起了人们关注。这是一张毕宿星团的深度照片，不仅体现其内恒星丰富的色彩，还显示出正巧位于此处的暗弱星云。视野中最亮的恒星是黄色的毕宿五,它是金牛座中公牛的“眼睛”。现在我们知道了，距离地球65光年的毕宿五并不属于150光年远的毕宿星团。中心区域的毕宿星团成员分布在15光年的范围内。毕宿星团形成于大约6.25亿年前，它和巨蟹座中肉眼可见的疏散星团——蜂巢星团很大可能有共同的起源，这一推断是基于蜂巢星团在空间中的运动以及它们极其相近的年龄。

高清原图地址：

https://apod.nasa.gov/apod/image/2001/Hyades_Mtanous_1998.jpg

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