19 Canum Venaticorum

Binary star system in the constellation Canes Venatici 19 Canum Venaticorum J2000 Canes Venatici 13 15 31.95263 +40 51 18.7516 5.77 (5.87 + 9.48) main sequence A7 V 0.198 0.004 −21.1 2.6 −113.761 +19.858 13.7210 0.1581 1.42 219.2 0.745 44.5 22.2 2201.7 0.686 273.3 19 CVn A 2.06 0.03 2.5 25.5 1.9 1.8 8048 274 commas 4.09 0.14 110 366 19 CVn +41°2374 461 115271 64692 5004 44531 J13155+4051 19+CVn 19 Canum Venaticorum is a binary star system in the northern constellation of Canes Venatici, located approximately 238 light years from Sun based on its parallax. It is dimly visible to the naked eye as a white-hued star with an apparent visual magnitude of 5.77. The pair orbit each other with a period of 219.2 years and an eccentricity of 0.686. The system is moving closer to the Earth with a heliocentric radial velocity of −21 km/s. The magnitude +5.87 primary, component A, is an A-type main-sequence star with a stellar classification of A7 V. It is 366 million years old with twice the mass of the Sun and 2.5 times the Sun's radius. The star is radiating 25.5 times the Sun's luminosity from its photosphere at an effective temperature of 8,048 K. It has a high rate of spin, showing a projected rotational velocity of 110 km/s. As of 2012, its companion, designated component B, is a magnitude 9.48 star located 0.60 arcseconds from the primary along a position angle of 58°. References 19 CVn 2018-07-26 1524888216726645248 Appenzeller Immo . MK Spectral Types for 185 Bright Stars Publications of the Astronomical Society of the Pacific 79 467 102 April 1967 10.1086/128449 1967PASP...79..102A free XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 10.1134/S1063773712050015 1108.4971 119257644 1 Mason B. D. Wycoff G. L. I. Hartkopf W. I. Douglass G. G. Worley C. E. The Washington Visual Double Star Catalog (WDS), Version 2019-01-21 The Astronomical Journal 122 6 3466–3471 December 2001 10.1086/323920 2001AJ....122.3466M U. S. Naval Observatory, Washington D.C. 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 free 2012A&A...546A..61D 1208.3048 59451347 Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures Allende Prieto C. Lambert D. L. Astronomy and Astrophysics 352 555–562 1999 1999A&A...352..555A astro-ph/9911002 David Trevor J. Hillenbrand Lynne A. The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets The Astrophysical Journal 804 2 146 2015 2015ApJ...804..146D 1501.03154 10.1088/0004-637X/804/2/146 33401607 Double Stars Information Circular 187 October 2015 International Astronomical Union, Commission G1 http://www.astro.gsu.edu/wds/bsl/cir187.pdf 2019-01-26 Rotational velocities of A-type stars. IV. Evolution of rotational velocities Zorec J. Royer F. Asplund Martin Cassisi Santi Ramirez Ivan Melendez Jorge Bensby Thomas Feltzing Sofia 1 Astronomy and Astrophysics 537 A120 2012 2012A&A...537A.120Z 1201.2052 10.1051/0004-6361/201117691 free 55586789 Category:A-type main-sequence stars Category:Binary stars Category:Canes Venatici Category:Durchmusterung objects Canum Venaticorum, 19 115271 064692 5004