NGC 247

NGC 247
チリのラ・シヤ天文台で撮影されたNGC 247
チリのラ・シヤ天文台で撮影されたNGC 247
星座 くじら座
見かけの等級 (mv) 9.9[1]
視直径 21′.4 × 6′.9[1]
分類 SAB(s)d[1]
位置
元期:J2000.0
赤経 (RA, α)  00h 47m 08.5s[1]
赤緯 (Dec, δ) −20° 45′ 37″[1]
距離 11.1 ± 1.2 × 106光年
他のカタログでの名称
HIPASS J0047-20、LEDA 2758、ESO-LV 540-0220、IRAS F00446-2101、2MASX J00470855-2045374、ESO 540-22、IRAS 00446-2101、MCG-04-03-005、GLXY G113.8-83.5+144、KUG 0044-210、UGCA 11、PGC 2758[1]、Caldwell 62
Template (ノート 解説) ■Project

NGC 247Caldwell 62)は、くじら座の方角に約1110万光年の位置にある中間渦巻銀河である(矮小渦巻銀河に分類されることもある)。距離は2011年2月末に確定された。以前の測定では1220万光年とされていたが、これは誤りであることが分かった。NGC 247は、ちょうこくしつ座銀河群に属する。

近隣の銀河と銀河群

NGC 247は、NGC 253と重力的に結びついているいくつかの銀河のうちの1つである。これらの銀河は、銀河系に最も近い銀河群の1つであるちょうこくしつ座銀河群の中心で小さな核を形成している[2]。NGC 253と重力的に結びついている他の銀河の多くは、この核に弱く結びついているだけである[2][3]

出典

  1. ^ a b c d e f NASA/IPAC Extragalactic Database”. Results for NGC 247. 2006年12月19日閲覧。
  2. ^ a b I. D. Karachentsev (2005). “The Local Group and Other Neighboring Galaxy Groups”. Astronomical Journal 129 (1): 178–188. arXiv:astro-ph/0410065. Bibcode2005AJ....129..178K. doi:10.1086/426368. 
  3. ^ I. D. Karachentsev, E. K. Grebel, M. E. Sharina, A. E. Dolphin, D. Geisler, P. Guhathakrta, P. W. Hodge, V. E. Karachentseva, A. Sarajedini, P. Seitzer (2003). “Distances to nearby galaxies in Sculptor”. Astronomy and Astrophysics 404 (1): 93–111. arXiv:astro-ph/0302045. Bibcode2003A&A...404...93K. doi:10.1051/0004-6361:20030170. 

https://www.eso.org/public/news/eso1107/

外部リンク

座標: 星図 00h 47m 08.5s, −20° 45′ 37″

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