11 Comae Berenices

Binary star system in the constellation Coma Berenices Coma Berenices constellation map.svg center 260 right Red circle.svg 10 11 Com 528 578 Location of 11 Comae Berenices (circled) J2000 Coma Berenices 12 20 43.02577 +17 47 34.3275 4.72 (4.89 + 12.9) red giant branch K0 III or G8+ III Fe-1 1.010 0.001 43.6 0.2 −109.426 +88.930 10.1677 0.1265 −0.02 1.66 0.21 15.8 0.3 110 4 2.38 0.06 4670 10 commas −0.51 0.02 1.53 0.54 11 Com +18 2592 2987 107383 60202 4697 100053 J12207+1748 11+Com 11 Comae Berenices is a binary star system in the northern constellation of Coma Berenices, located in the sky, east and slightly north of Denebola in Leo, but not nearly as far east as ε Virginis in Virgo. It is about a degree from the elliptical galaxy M85 and two degrees north of the spiral galaxy M100. Based upon an annual parallax shift of 10.7104 mas, the star is located 305 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 4.72. This body is moving away from the Sun with a heliocentric radial velocity of +44 km/s. The primary component is an aging K-type giant star with a stellar classification of K0 III. It is a low metallicity star with an iron abundance about half that of the Sun. Keenan and McNeil (1989) found a class of G8+ III Fe-1, showing an underabundance of iron in the spectrum. At the age of 1.5 billion years old with 1.7 times the mass of the Sun, it has exhausted the hydrogen at its core and expanded to 15.8 times the Sun's radius. The star is radiating 110 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,670 K. It has a magnitude 12.9 companion star at an angular separation of 8.8 arcsecond along a position angle of 44°, as of 2007. Planetary system A substellar companion was discovered orbiting the primary star in 2007 using the radial velocity method. It has a period of 326 days with minimum mass of about 19.4 Jupiter masses and is orbiting around 1.3 AU from the host star with an eccentricity of 0.23. The object's mass is well within the range of deuterium-fusing brown dwarfs. b ≥19.4 1.5 326.03 0.32 1.29 0.05 0.231 0.005 2007 References 3946945413106333696 XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 1108.4971 10.1134/S1063773712050015 119257644 Jofré E. Petrucci R. Saffe C. Saker L. de la Villarmois E. Artur Chavero C. Gómez M. Mauas P. J. D. Stellar parameters and chemical abundances of 223 evolved stars with and without planets 1 Astronomy & Astrophysics 574 A50 2015 2015A&A...574A..50J 1410.6422 10.1051/0004-6361/201424474 free 53666931 A Substellar Companion to the Intermediate-Mass Giant 11 Comae Liu Y.-J. Sato Bun'ei Zhao G. Noguchi Kunio Wang H. Kambe Eiji Ando Hiroyasu Izumiura Hideyuki Chen Y.-Q. Okada Norio Toyota Eri Omiya Masashi Masuda Seiji Takeda Yoichi Murata Daisuke Itoh Yoichi Yoshida Michitoshi Kokubo Eiichiro Ida Shigeru 1 The Astrophysical Journal 672 1 553–557 2008 0709.0645 2008ApJ...672..553L 10.1086/523297 18039163 * 11 Com 8 September 2012 Stellar diameters and temperatures – V. 11 newly characterized exoplanet host stars von Braun Kaspar Boyajian Tabetha S. Van Belle Gerard T. Kane Stephen R. Jones Jeremy Farrington Chris Schaefer Gail Vargas Norm Scott Nic Ten Brummelaar Theo A. Kephart Miranda Gies Douglas R. Ciardi David R. López-Morales Mercedes Mazingue Cassidy McAlister Harold A. Ridgway Stephen Goldfinger P. J. Turner Nils H. Sturmann Laszlo 1 Monthly Notices of the Royal Astronomical Society 438 3 2413–2425 2014 1312.1792 2014MNRAS.438.2413V 10.1093/mnras/stt2360 free 275132 https://exoplanet.eu/catalog/11_com_b--882/ Extrasolar Planets Encyclopaedia Planet 11 Com b 2023 1 Mason B. D. Wycoff G. L. Hartkopf W. I. Douglass G. G. Worley C. E. The Washington Visual Double Star Catalog The Astronomical Journal 122 6 3466 2014 2001AJ....122.3466M 10.1086/323920 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 The Perkins catalog of revised MK types for the cooler stars Astrophysical Journal Supplement Series 0067-0049 71 245 1989 Keenan Philip C. McNeil Raymond C. 1989ApJS...71..245K 10.1086/191373 123149047 Category:G-type giants Category:Binary stars Category:Planetary systems with one confirmed planet Category:Coma Berenices Category:Durchmusterung objects Comae Berenices, 11 107383 060202 4697