KY Cygni

Lokasi KY Cygni (dilingkari, timur berada di atas)
Data pengamatan Epos J2000.0      Ekuinoks J2000.0 (ICRS)
Rasi bintang	Cygnus
Asensio rekta	20j 25m 58.04d[1]
Deklinasi	+38° 21′ 07.7″[1]
Magnitudo tampak (V)	11.14[2] (10.60 - 11.74[3])
Ciri-ciri
Kelas spektrum	M3 Ia[4] (M3.5 Ia[5] (M3.5 Ia[5])
Indeks warna U−B	+2.91[2]
Indeks warna B−V	+3.39[2]
Jenis variabel	Lc[5]
Astrometri
Gerak diri (μ)	RA: –3.556[1] mdb/thn Dek.: –6.061[1] mdb/thn
Paralaks (π)	0,6687±0,0517[1] mdb
Jarak	4.900 ± 400 tc (1.500 ± 100 pc)
Magnitudo mutlak (MV)	–8.18[6]
Detail
Massa	19[7] M☉
Radius	1,033[7] R☉
Luminositas	138,000[2] – 270,000[6][8] L☉
Gravitasi permukaan (log g)	−0.5 (−0.9?)[6]
Suhu	3,550[9] K
Penamaan lain
KY Cyg, GSC 03152-01140, IRAS 20241+3811, IRC+40415, TYC 3152-1140-1, RAFGL 2575, UCAC2 45230193, 2MASS J20255805+3821076
Referensi basis data
SIMBAD	data

KY Cygni adalah bintang Superraksasa merah dari kelas spektrum M3.5la yang terletak di rasi bintang Cygnus.^[10] KY Cygni merupakan salah satu bintang terbesar dan paling bercahaya yang pernah diketahui, dengan luminositas sekitar 300.000 kali lebih dari matahari dengan radius 1.000 kali ruas jari jari matahari. Jika ditempatkan di Tata Surya maka fotosfernya akan mencapai orbit Jupiter atau mungkin Saturnus.

Referensi

1. 1 2 3 4 5 Gaia Collaboration; Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; Babusiaux, C.; Biermann, M.; Creevey, O. L.; Evans, D. W. (2021-05-01). "Gaia Early Data Release 3. Summary of the contents and survey properties". Astronomy and Astrophysics. 649: A1. doi:10.1051/0004-6361/202039657. ISSN 0004-6361. Catatan Gaia DR3 untuk sumber ini di VizieR.
2. 1 2 3 4 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. S2CID 119276502.
3. ↑ Alfonso-Garzón, J.; Domingo, A.; Mas-Hesse, J. M.; Giménez, A. (2012). "The first INTEGRAL-OMC catalogue of optically variable sources". Astronomy & Astrophysics. 548: A79. arXiv:1210.0821. Bibcode:2012A&A...548A..79A. doi:10.1051/0004-6361/201220095. S2CID 118428054.
4. ↑ White, N. M.; Wing, R. F. (1978). "Photoelectric two-dimensional spectral classification of M supergiants". Astrophysical Journal. 222: 209. Bibcode:1978ApJ...222..209W. doi:10.1086/156136.
5. 1 2 3 KY Cyg, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars Diarsipkan 2017-06-20 di Wayback Machine., Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 12, 2010.
6. 1 2 3 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): 973–985. arXiv:astro-ph/0504337. Bibcode:2005ApJ...628..973L. doi:10.1086/430901. S2CID 15109583.
7. 1 2 Comerón, F.; Djupvik, A. A.; Schneider, N.; Pasquali, A. (October 2020). "The historical record of massive star formation in Cygnus". Astronomy & Astrophysics. 644: A62. arXiv:2009.12779. Bibcode:2020A&A...644A..62C. doi:10.1051/0004-6361/202039188. S2CID 221970180.
8. ↑ Dorn-Wallenstein, Trevor Z.; Levesque, Emily M.; Neugent, Kathryn F.; Davenport, James R. A.; Morris, Brett M.; Gootkin, Keyan (2020). "Short Term Variability of Evolved Massive Stars with TESS II: A New Class of Cool, Pulsating Supergiants". The Astrophysical Journal. 902 (1): 24. arXiv:2008.11723. Bibcode:2020ApJ...902...24D. doi:10.3847/1538-4357/abb318. S2CID 221340538. Pemeliharaan CS1: DOI bebas tanpa ditandai (link)
9. ↑ Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID 148571616. Pemeliharaan CS1: DOI bebas tanpa ditandai (link)
10. ↑ "KY Cygni (Supergiant Star) Star Facts". Universe Guide (dalam bahasa Inggris). Diakses tanggal 2020-02-15.

Pranala luar

• http://jumk.de/astronomie/big-stars/ky-cygni.shtml
• http://www.astronomy.com/asy/default.aspx?c=a&id=2772