11 Cephei

Star in the constellation Cepheus Cepheus constellation map.svg center 280 right Red circle.svg 10 11 Cephei 668 685 Location of 11 Cephei (circled in red) J2000 Cepheus 21 41 55.30845 +71 18 41.2675 4.55 horizontal branch K0.5 III G 4.23 1.108 0.004 −38.36 0.19 +111.840 0.129 +92.204 0.118 18.1808 0.1192 0.16 2.38 0.07 10.93 0.27 0.26 94.9 8.8 5446 113 commas 0.17 2.41 1.0 670 60 11 Cep +70°1193 817 206952 107119 8317 10126 11+Cep 11 Cephei is a single star in the northern constellation of Cepheus, located 179 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.55. The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.153 arc seconds per annum. It is moving closer to the Earth with a heliocentric radial velocity of −38 km/s. This is an aging giant star with a stellar classification of K0.5 III, having exhausted the hydrogen at its core and expanded. It is a red clump giant, which means it is currently on the horizontal branch and is generating energy through helium fusion at the core. 11 Cephei is 670 million years old with 2.4 times the mass of the Sun and 11 times the Sun's radius. It is radiating around 95 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5,446 K. References 11 Cep April 28, 2019 2272649822619848064 Alves David R. K-Band Calibration of the Red Clump Luminosity The Astrophysical Journal 539 2 732–741 August 2000 10.1086/309278 2000ApJ...539..732A astro-ph/0003329 16673121. XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 10.1134/S1063773712050015 1108.4971 119257644. Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer Baines Ellyn K. Armstrong J. Thomas Schmitt Henrique R. Zavala R. T. Benson James A. Hutter Donald J. Tycner Christopher Belle Gerard T. van 1 The Astronomical Journal 155 30 2018 1 1712.08109 2018AJ....155...30B 10.3847/1538-3881/aa9d8b 119427037 free . Eggleton P. P. Tokovinin A. A. A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869–879 September 2008 10.1111/j.1365-2966.2008.13596.x free 2008MNRAS.389..869E 0806.2878 14878976 . Lépine Sébastien Shara Michael M. A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog) The Astronomical Journal 129 3 1483–1522 March 2005 10.1086/427854 2005AJ....129.1483L astro-ph/0412070 2603568. Keenan Philip C. McNeil Raymond C. The Perkins catalog of revised MK types for the cooler stars Astrophysical Journal Supplement Series 0067-0049 71 245 1989 1989ApJS...71..245K 10.1086/191373 . 1 De Medeiros J. R. do Nascimento J. D. Jr. Sankarankutty S. Costa J. M. Maia M. R. G. Rotation and lithium in single giant stars Astronomy and Astrophysics 363 239–243 November 2000 2000A&A...363..239D astro-ph/0010273. Category:K-type giants Category:Horizontal-branch stars Category:Cepheus (constellation) BD+70 1193 Cephei, 11 206952 107119 8317