天鵝座KY
天鵝座KY是一顆位於天鵝座的紅超巨星。它是目前已知最大的恆星之一，直徑是太陽的1420倍以上。亮度是太陽的30萬倍以上。天鵝座KY距離地球大約5000光年。
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 天鵝座 |
| 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 | |
| 光譜分類 | M3.5Ia[1] |
| B−V 色指數 | 2.8[1] |
| 變星類型 | 不規則變星[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 |
| 天體測定 | |
| 距離 | ~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 | 資料 |
參見
編輯參考資料
編輯- ^ 1.0 1.1 1.2 1.3 1.4 V* KY Cyg -- Pulsating variable Star, database entry, SIMBAD. Accessed on line November 12, 2010.
- ^ 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.
- ^ List of Largest Stars Gets 3 New Chart Toppers, Robert Roy Britt, space.com, 10 January 2005. Accessed on line November 12, 2010.
- ^ 4.0 4.1 4.2 4.3 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.)
- ^ 5.0 5.1 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.
- ^ 6.0 6.1 "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.