11 Serpentis

Star in the constellation Serpens A1 Serpentis other stars with this Bayer designation A Serpentis J2000 Serpens 15 32 57.93765 −01 11 11.0412 5.497 horizontal branch K0 III 1.092 1.05 −16.1 2.8 −17.765 −42.217 12.0563 0.1290 0.83 1.27 0.35 11 50 4767 92 commas 2.48 0.11 −0.13 2.75 0.88 0.66 A1 Ser 11 Ser −00°2982 3226 138562 76133 5772 140596 20896 11+Ser 11 Serpentis is a single star in the constellation of Serpens, located 271 light years away from the Sun. It has the Bayer designation A1 Serpentis, 11 Serpentis is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.497. It is moving closer to the Earth with a heliocentric radial velocity of −16 km/s. This is an aging giant star with a stellar classification of K0 III, a star that has used up its core hydrogen and has expanded. It is a red clump giant on the horizontal branch, which indicates it is generating energy through the fusion of helium at its core. 11 Serpentis is 2.75 billion years old with 1.3 times the mass of the Sun and has 11 times the Sun's radius. It is radiating 50 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,767 K. References 4416110082695309184 11 Ser 2019-03-21 XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 10.1134/S1063773712050015 1108.4971 119257644 . Discordances in Star Designations Hoffleit D. Bulletin d'Information du Centre de Données Stellaires 17 38 July 1979 17 1979BICDS..17...38H 1 Feuillet Diane K. Bovy Jo Holtzman Jon Girardi Léo MacDonald Nick Majewski Steven R. Nidever David L. Determining Ages of APOGEE Giants with Known Distances The Astrophysical Journal 817 1 40 2016 2016ApJ...817...40F . 1511.04088 10.3847/0004-637x/817/1/40 118675933 free de Bruijne J. H. J. Eilers A.-C. Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project Astronomy & Astrophysics 546 A61 14 October 2012 10.1051/0004-6361/201219219 2012A&A...546A..61D 1208.3048 59451347 . Massarotti Alessandro Latham David W. Stefanik Robert P. Fogel Jeffrey Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity The Astronomical Journal 1 135 1 209–231 January 2008 10.1088/0004-6256/135/1/209 2008AJ....135..209M 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 2008 0806.2878 2008MNRAS.389..869E 10.1111/j.1365-2966.2008.13596.x free 14878976 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 . Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars Houk N. Swift C. Michigan Spectral Survey Ann Arbor, Michigan Department of Astronomy, University of Michigan 5 1999 1999MSS...C05....0H Category:K0III stars Category:Horizontal-branch stars Category:Serpens Serpentis, A1 Category:Durchmusterung objects Serpentis, 11 138562 076133 5772