NGC 884

NGC 884
NGC 884
	位于英仙座的双星团。在上方的是NGC 869，NGC 884在底部。北方在图的左侧。
观测资料 (J2000 历元)
星座	英仙座
赤经	02h 22.0m
赤纬	+57° 08′
距离	7.6 kly (2.3 kpc)
视星等 (V)	3.8
视大小 (V)	30′
物理特征
估计年龄	12.5 My
其他特征	科德韦尔14、Cr 25、 Mel 14、Raab 10、OCl 353、Chi Per Cluster、χ Persei
	相关条目：疏散星团、NGC天体表

NGC 884 （也称为英仙座χ ）是一个位于英仙座的疏散星团，距离地球7,600^[2]。它位于和NGC 869组成的双星团的最东端。NGC 869和884通常各别被称为英仙座h和χ^[4]。这个星团的年龄估计已有为1,250万年^[2]。这两个星团有物理上的关联性，估计相距只有数百光年，都是星协英仙座OB1的成员。喜帕恰斯是最早记录下这两个星团的人，但很可能远古时代早就已经知道这两个星团。

双星团是业余天文学家的最爱。像这种明亮的星团通常是用小望远镜拍摄或观察到的。但双星团简单到肉眼就能在英仙座和仙后座之间看见，在冬天的银河中也是一个明亮的区域。双星团也被收录在专供业余天文观测使用的科德韦尔深空天体表^[3]。在小望远镜中，星团以美丽的星形组合出现在富饶的恒星场中。该星团以明亮的蓝色恒星为主，还拥有一些橙色恒星，丰富了人们的视觉兴趣。两个星团一起为低倍率的视野提供了壮观的景色。

参考资料

^ ^1.0 ^1.1 ^1.2 ^1.3 NGC 884. SIMBAD. 斯特拉斯堡天文资料中心. [2006-12-22].
^ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 Kharchenko; et al. Astrophysical Parameters of Galactic Open Clusters. Astronomy and Astrophysics. 2005, 438 (3): 1163–1173 [2020-10-19]. Bibcode:2005A&A...438.1163K. arXiv:astro-ph/0501674  . doi:10.1051/0004-6361:20042523. （原始内容存档于2016-02-21）.
^ ^3.0 ^3.1 O'Meara, Stephen James. The Caldwell Objects. Cambridge University Press. 2002. ISBN 978-0-521-82796-6.
^ Some confusion surrounds what Bayer intended by these designations. It is sometimes claimed that Bayer could not have resolved the pair into two patches of nebulosity, and that Chi refers to the Double Cluster and h to a nearby star; see Stephen James O'Meara and Daniel W.E. Green, 2003, "The Mystery of the Double Cluster", Sky and Telescope, Vol. 105, No. 2 (February 2003), p. 116–119. Bayer's Uranometria chart for Perseus does not show them as nebulous objects, but his chart for Cassiopeia does, and they are described as Nebulosa Duplex in Schiller's Coelum Stellatum Christianum, which was assembled with Bayer's help; see Morton Wagman, Lost Stars, McDonald & Woodward, 2003, ISBN 0939923785, p. 240.

维基共享资源上的相关多媒体资源：NGC 884

天文学目录
NGC天体表：	NGC 882 - NGC 883 - NGC 884 - NGC 885 - NGC 886

[simbad-1] 1.0 ^1.1 ^1.2 ^1.3 NGC 884. SIMBAD. 斯特拉斯堡天文资料中心. [2006-12-22].

[Kharchenko-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 Kharchenko; et al. Astrophysical Parameters of Galactic Open Clusters. Astronomy and Astrophysics. 2005, 438 (3): 1163–1173 [2020-10-19]. Bibcode:2005A&A...438.1163K. arXiv:astro-ph/0501674  . doi:10.1051/0004-6361:20042523. （原始内容存档于2016-02-21）.

[caldwell-3] 3.0 ^3.1 O'Meara, Stephen James. The Caldwell Objects. Cambridge University Press. 2002. ISBN 978-0-521-82796-6.

[4] Some confusion surrounds what Bayer intended by these designations. It is sometimes claimed that Bayer could not have resolved the pair into two patches of nebulosity, and that Chi refers to the Double Cluster and h to a nearby star; see Stephen James O'Meara and Daniel W.E. Green, 2003, "The Mystery of the Double Cluster", Sky and Telescope, Vol. 105, No. 2 (February 2003), p. 116–119. Bayer's Uranometria chart for Perseus does not show them as nebulous objects, but his chart for Cassiopeia does, and they are described as Nebulosa Duplex in Schiller's Coelum Stellatum Christianum, which was assembled with Bayer's help; see Morton Wagman, Lost Stars, McDonald & Woodward, 2003, ISBN 0939923785, p. 240.

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