威尔曼1
| 威尔曼1 | |
|---|---|
| 观测资料（J2000 历元） | |
| 星座 | 大熊座 |
| 赤经 | 10h 49m 22.3s[1] |
| 赤纬 | +51° 03′ 03.6″[1] |
| 距离 | 120,000 ± 20,000光年 (38,000 ± 7,000秒差距)[2] |
| 视星等 (V) | 15.4 ± 0.4[a] |
| 特征 | |
| 类型 | 极端矮椭球星系或 异常球状星团[1] |
| 其他名称 | |
| SDSS J1049+5103[1] | |
威尔曼1或SDSS J1049+5103[2]是纽约大学的贝丝·威尔曼领导的一个小组，使用史隆数位巡天资料发现的一个异常的球状星团或超低质量的矮星系 [3]。在2006年，它是继牧夫座矮椭球星系和大熊座矮椭球星系之后第三暗的星系，而比后继的还按200倍。这个星系是银河系的卫星星系，距离大约12,000光年远，绝对亮度为-2.5等[2]。亮度函数由中心向外的变化，显示质量分离的情况与帕罗马 5中所发现的类似[2]。
注解
参考资料
- NED, Results for SDSS J1049+5103, NASA/IPAC Extragalactic Database (Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration), 2007
- Willman, Beth; Blanton; West; Dalcanton, A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite?, The Astronomical Journal 129 (6), 2005, 129 (6): 2692–2700
- Willman, Beth; Masjedi; Hogg; Dalcanton, Willman 1 - A Galactic Satellite at 40 kpc With Multiple Stellar Tails, The Astronomical Journal, subject to acceptance, 2006,, subject to acceptance
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