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后发星团

后发星团(Coma Star Cluster)
2003年3月在英国德比郡乡下拍摄的梅洛特111。
观测资料 (J2000 历元)
星座后发座
赤经12h 22.5m[1]
赤纬+25° 51′[1]
距离280 ly (86 pc[2][3])
视星等 (V)+1.8
视大小 (V)7.5° [2]
物理特征
质量M
半径-
估计年龄-
其他特征Melotte 111,[1] Coma Ber Cluster,[1] OCl 558.0,[1] Collinder 256[4]
相关条目:疏散星团NGC天体表

后发星团位于后发座,在P. J. Melotte编辑的星团目录中,给定的名称是梅洛特111Melotte 111)。这是在银河系内的一个小疏散星团,大约有40颗较亮的恒星(视星等5-10等)有着相同的自行依巴谷卫星和红外颜色-星等图的拟合已被用来建立星团群聚中心的距离大约是86秒差距(280光年)[2][3]。这个距离也获得独立分析的认同,从而使这个星团成为宇宙距离尺度上重要的一阶。这个星团的距离大约是毕宿星团的两倍,覆盖了天球上超过7.5度的范围[2][3]。这个星团的年龄大约是4亿5千万年,在优质双筒望远镜视野中,这个星团的恒星都可以同时被看见。在星团升起来的阶段,集团中最亮的那些恒星可以辨认出鲜明的V字形。

这个星团原本是代表着狮子座的狮子尾巴,但是传说在公元前240年左右,托勒密三世将他改称为埃及女王贝勒尼基二世奉献给天神的头发,并重新命名。

图集

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参考资料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 Cl Melotte 111 -- Open (galactic) Cluster. SIMBAD. [23 October 2013]. (原始内容存档于2014-12-16). 
  2. ^ 2.0 2.1 2.2 2.3 van Leeuwen, F. Parallaxes and proper motions for 20 open clusters as based on the new Hipparcos catalogue. Astronomy and Astrophysics. April 2009, 497 (1): 209–242. Bibcode:2009A&A...497..209V. arXiv:0902.1039可免费查阅. doi:10.1051/0004-6361/200811382. 
  3. ^ 3.0 3.1 3.2 Majaess, D.; Turner, D.; Lane, D.; Krajci, T. Deep Infrared ZAMS Fits to Benchmark Open Clusters Hosting Delta Scuti Stars. Journal of the American Association of Variable Star Observers. September 2011, 39 (2): 219. Bibcode:2011JAVSO..39..219M. arXiv:1102.1705可免费查阅. 
  4. ^ Houston, Walter Scott. Open Clusters by the Season. Sky & Telescope: 8. [23 October 2013]. [永久失效链接]

外部链接

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后发星团
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