NGC 251

NGC 251
スローン・デジタル・スカイサーベイによる画像
星座 うお座
見かけの等級 (mv) 14.6[1]
視直径 2.4' × 1.9'[2]
分類 Sc[2]
位置
元期:J2000.0
赤経 (RA, α)  00h 47m 54.031s[3]
赤緯 (Dec, δ) +19° 35′ 48.51″[3]
赤方偏移 0.015184[2]
視線速度 (Rv) 4552 km/s[2]
距離 204.36 ± 12.64 Mly (62.657 ± 3.876 Mpc)[2]
物理的性質
直径 148,600 ly (45,570 pc)[2][note 1]
他のカタログでの名称
UGC 490, MGC+03-03-003, PGC 2806[1]
■Template （■ノート ■解説） ■Project

NGC 251は、うお座の方角にある渦巻銀河である。1784年10月15日にイギリスの天文学者ウィリアム・ハーシェルが発見した。

この銀河の中で、SN 2023rkyという超新星（II型超新星、18.8等級）が1つ観測されている[4]。

備考

  1. ^ POSS1 103a-O values used.

出典

  1. ^ a b "NGC 251". SIMBAD. Centre de données astronomiques de Strasbourg. 2017年5月5日閲覧。
  2. ^ a b c d e f “NED results for object NGC 0251”. National Aeronautics and Space Administration / Infrared Processing and Analysis Center. 5 May 2017閲覧。
  3. ^ a b Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). “The Two Micron All Sky Survey (2MASS)”. The Astronomical Journal 131 (2): 1163–1183. Bibcode: 2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. 
  4. ^ Transient Name Server entry for SN 2023rky. Retrieved 7 September 2023.

外部リンク

  • ウィキメディア・コモンズには、NGC 251に関するカテゴリがあります。

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