天鵝座KY

天鹅座KY是一颗位于天鹅座的红超巨星。它是目前已知最大的恒星之一，直径是太阳的1420倍以上。亮度是太阳的30万倍以上。天鹅座KY距离地球大约5000光年。

天鹅座KY
KY Cygni
觀測資料
曆元 J2000.0
星座 天鹅座
星官
赤經 20h 25m 58.05s[1]
赤緯 +38° 21′ 07.6″[1]
視星等（V） 10.77[1]
特性
光谱分类M3.5Ia[1]
B−V 色指数2.8[1]
变星类型不规则变星[2]
詳細資料
質量25[3] M☉
半徑1,420–2,850[4] R☉
表面重力 (log g)−1.0 － −0.5[4]
亮度 (bolometric)270,000–1,100,000[4] L☉
溫度3,500[4] K
天体测定
距离~5,000[5][6] ly
(~1,600[5][6] pc)
其他命名
KY Cyg, AN 339.1929, IRAS 20241+3811, IRC +40415, LEE 220, RAFGL 2575.
參考資料庫
SIMBAD资料
天鵝座KY和參宿四體積比較

参见

参考资料
  1. V* KY Cyg -- Pulsating variable Star, database entry, SIMBAD. Accessed on line November 12, 2010.
  2. KY Cyg, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 12, 2010.
  3. List of Largest Stars Gets 3 New Chart Toppers, Robert Roy Britt, space.com, 10 January 2005. Accessed on line November 12, 2010.
  4. Table 4, Levesque et al. 2005, using Mbol = −10.36/−8.84 for KY Cygni (see the table) and 4.74 for the Sun (p. 982.)
  5. KY Cygni is in the Cyg OB1 association, which has an adopted estimated distance modulus of 11.0. See Tables 1 and 2, Levesque et al. 2005.
  6. "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought", Emily M. Levesque, Philip Massey, K. A. G. Olsen, Bertrand Plez, Eric Josselin, Andre Maeder, and Georges Meynet, The Astrophysical Journal 628, #2 (August 2005), pp. 973-985, doi:10.1086/430901, Bibcode：2005ApJ...628..973L.
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