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小熊座矮星系

小熊座矮星系
观测资料(J2000 历元
星座小熊座
赤经15h 09m 08.5s[1]
赤纬+67° 13′ 21″[1]
红移-247 ± 1 km/s[1]
距离200 ± 30 kly(60 ± 10 kpc[2][3]
视星等 (V)11.9[1]
特征
类型E[1]
角直径 (V)30′.2 × 19′.1[1]
其他银河系的卫星星系
其他名称
UGC 9749,[1] PGC 54074,[1] DDO 199,[1] UMi Dwarf[1]
参见:星系星系列表

小熊座矮星系罗威尔天文台的A.G. Wilson在1954年发现的一个矮椭圆星系,它位于小熊座内,是银河系的一个卫星星系。这个星系的成员都是老年的恒星,看起来在小熊座矮星系只有极少甚至已经没有在形成中的恒星。

演化历史

1999年,肯尼斯‧米格尔(Kenneth Mighell)和克里斯多福‧伯克(Christopher Burke)共同使用了哈伯太空望远镜,证实在140亿年前有一段持续了约20亿年之久的恒星形成爆炸期[4]

相关条目

参考资料

  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 NASA/IPAC Extragalactic Database. Results for Ursa Minor Dwarf. [2006-11-29]. (原始内容存档于2013-06-07). 
  2. ^ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov. A Catalog of Neighboring Galaxies. Astronomical Journal. 2004, 127: 2031–2068 [2008-02-05]. (原始内容存档于2007-10-12). 
  3. ^ Karachentsev, I. D.; Kashibadze, O. G. Masses of the local group and of the M81 group estimated from distortions in the local velocity field. Astrophysics. 2006, 49 (1): 3–18. 
  4. ^ van den Bergh, Sidney, Updated Information on the Local Group, The Publications of the Astronomical Society of the Pacific, April 2000, 112 (770): 529-536 [2008-02-05], (原始内容存档于2019-10-15) 
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小熊座矮星系
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