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涡状星系

涡状星系
涡状星系(M51A/B或NGC 5194/5),
图片来源:美国国家航空暨太空总署/欧洲太空总署
观测资料(J2000 历元
星座猎犬座[1]
赤经13h 29m 52.7s[2]
赤纬+47° 11′ 43″[2]
红移463 ± 3 km/s[2]
距离23 ± 4 百万光年 (7.1 ± 1.2 百万秒差距)[3]
视星等 (V)9.0[2]
特征
类型SA(s)bc pec[2]
角直径 (V)11′.2 × 6′.9[2]
其他NGC 5195相互扰动[4]
其他名称
Question Mark Galaxy,[2] Rosse's Galaxy,[2]
M51a,[2] NGC 5194,[2] UGC 8493,[2] PGC 47404,[2]
VV 001a,[2] VV 403,[2] 阿普 85[2]
参见:星系星系列表

涡状星系(Whirlpool Galaxy),又叫做M51或是NGC 5194,位在天空北方的猎犬座(Canes Venaciti),长度约有65000光年,距离地球2300万光年。

发现

涡状星系是由查尔斯·梅西耶于1773年10月13日发现的。其伴星系NGC 5195则由皮埃尔·梅香于1781年发现。直至1845年,它才第一次被看出是旋涡星系,而发现它是漩涡状的是威廉·帕森思,他透过一座建于爱尔兰比尔城堡的72吋反射望远镜而得出此观察结果。在2005年,人们观察到涡状星系内的一颗超新星SN 2005cs,其最高亮度达14。2011年5月31日观察到另一颗属于II型超新星的超新星SN 2011dh,视星等达到13.5,座标是13:30:05.08 +47:10:11.2[5]。有时候,M51是指涡状星系及其伴星系,如果要作出区分的话,则会将涡M51分为M51A(NGC 5194)及M51B(NGC 5195)。


相关条目

注释

  1. ^ R. W. Sinnott, editor. The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. 1988. ISBN 978-0-933346-51-2. 
  2. ^ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 NASA/IPAC Extragalactic Database. Results for NGC 5194. [2006-12-06]. (原始内容存档于2011-02-02). 
  3. ^ Takáts, K.; Vinkó, J. Distance estimate and progenitor characteristics of SN 2005cs in M51. Monthly Notices of the Royal Astronomical Society, Online Early. 2006. 
  4. ^ H. Arp. Atlas of Peculiar Galaxies. Astrophysical Journal Supplement. 1966, 14: 1–20 [2007-09-19]. (原始内容存档于2008-01-20). 
  5. ^ Richard Kinne (kqr). AAVSO Special Notice #241: New Supernova in M51. AAVSO. 2011-06-03 [2011-06-06]. (原始内容存档于2019-10-25). 

外部链接

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涡状星系
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