鬼星团，也称为蜂巢星团（拉丁文是"manger"）、M44、NGC 2632或Cr 189，是位于巨蟹座的一个疏散星团。它是最靠近太阳系的疏散星团之一，并且有着比其它邻近疏散星团更多的恒星。在黑暗的夜空下，裸眼看见的鬼宿星团像是一个模糊的斑块，因此在远古时代就有纪载，中国称他为积尸气。古代的天文学家托勒密描述他是"巨蟹胸部的集团"，并且是伽利略用望远镜研究的第一批天体之一 。

这个星团与另一个疏散星团，毕宿星团，有着相似的年龄和自行，因此建议它们有着类似的起源。这两个星团的成员都包含红巨星和白矮星，这些都是恒星演化阶段后期的恒星；以及主序带上光谱分类为A、 F、 G、 K 和 M的恒星。

The Beehive Cluster, also known as Praesepe (Latin for "manger"), M44, NGC 2632, or Cr 189, is an open cluster in the constellation Cancer. It is one of the nearest open clusters to the Solar System, and it contains a larger star population than most other nearby clusters. Under dark skies the Beehive Cluster looks like a nebulous object to the naked eye; thus it has been known since ancient times. The classical astronomer Ptolemy called it "the nebulous mass in the breast of Cancer," and it was among the first objects that Galileo studied with his telescope.