KY Cygni
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 25m 58.05s[1] |
| Declination | +38° 21′ 07.6″[1] |
| Apparent magnitude (V) | 13.50[2] (13.5 - 15.5)[3] |
| Characteristics | |
| Spectral type | M3-4I[4] |
| B−V color index | 0.12[2] |
| Variable type | LC[3] |
| Astrometry | |
| Distance | ~5,000 ly (1,580[5] pc) |
| Absolute magnitude (MV) | -8.18[4] |
| Details | |
| Radius | 1,420 (2,850?)[4] R☉ |
| Luminosity (bolometric) | 270,000 (1,100,000?)[4] L☉ |
| Surface gravity (log g) | −1.0 (−0.5?)[4] cgs |
| Temperature | 3,500[4] K |
| Other designations | |
KY Cyg, AN 339.1929, IRAS 20241+3811, IRC +40415, LEE 220, RAFGL 2575. | |
| Database references | |
| SIMBAD | data |
KY Cygni is a red supergiant (spectral class M3.5Ia[3]) located in the constellation Cygnus. It is one of the largest stars known, with an estimated radius of 1,420 times that of the Sun and is also one of the most luminous, with about 300,000 or more times the Sun's luminosity. It is approximately 5,000 light-years away.
See also
References
- ^ a b Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: University of Massachusetts and Infrared Processing and Analysis Center. 2246: 0. Bibcode:2003yCat.2246....0C.
- ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
- ^ a b c 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.
- ^ a b c d e f Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal. 628 (2): 973. arXiv:astro-ph/0504337. Bibcode:2005ApJ...628..973L. doi:10.1086/430901..
- ^ Mauron, N.; Josselin, E. (2011). "The mass-loss rates of red supergiants and the de Jager prescription". Astronomy and Astrophysics. 526: A156. arXiv:1010.5369. Bibcode:2011A&A...526A.156M. doi:10.1051/0004-6361/201013993.
External links
- http://jumk.de/astronomie/big-stars/ky-cygni.shtml
- http://www.astronomy.com/asy/default.aspx?c=a&id=2772
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