17 Delphini

Suspected variable star in Delphinus 17 Delphini J2000 Delphinus 20 55 36.689 +13 43 17.53 5.18 (5.16-5.27) red giant branch K0 III +1.13 +0.95 suspected −10.20.9 6.3132 0.0699 +16.457 −11.468 −0.64 2.33 23.36 219 2.07 −0.19 4,616 31 832 17 Del 199253 103294 8011 +13°2209 +13°4572 3669 29201 106665 17+Del 17 Delphini is a solitary star in the northern constellation of Delphinus. It has an absolute magnitude of −0.64 and apparent magnitude of 5.18, allowing it to be faintly seen with the naked eye. Located 517 light years away, it is approaching the Solar System with a heliocentric radial velocity of -10.2 km/s. 17 Delphini is an orange giant that is most likely on the horizontal branch (84% probability). At present it has 2.33 times the mass of the Sun, but at an age of 832 million years — has expanded to 23.36 times the radius of the Sun. It shines at 219 solar luminosities from its enlarged photosphere at an effective temperature of 4,616 K, giving it an orange glow. 17 Del has an iron abundance 64% that of the Sun and spins modestly with a projected rotational velocity of 3 km/s. 17 Del is suspected to be a variable star of unknown type ranging from 5.16 to 5.27. References 1761510948746562816 Høg E. Fabricius C. Makarov V. V. Urban S. Corbin T. Wycoff G. Bastian U. Schwekendiek P. Wicenec A. The Tycho-2 catalogue of the 2.5 million brightest stars Astronomy and Astrophysics March 2000 355 L27–L30 0004-6361 2000A&A...355L..27H Griffin R. F. Redman R. O. Photoelectric Measurements of the 4200 A CN Band and the G Band in G8-K5 Spectra Monthly Notices of the Royal Astronomical Society 1 April 1960 120 4 287–316 10.1093/mnras/120.4.287 1960MNRAS.120..287G free Gutierrez-Moreno A. A system of photometric standards. Publications of the Department of Astronomy University of Chile 1966 1 1 1966PDAUC...1....1G Samus’ N. N. Kazarovets E. V. Durlevich O. V. Kireeva N. N. Pastukhova E. N. General catalogue of variable stars: Version GCVS 5.1 Astronomy Reports January 2017 61 1 80–88 10.1134/S1063772917010085 1063-7729 2017ARep...61...80S 255195566 Wilson Ralph Elmer General catalogue of stellar radial velocities. Carnegie Institute Washington D.C. Publication 1953 0 1953GCRV..C......0W Anderson E. Francis Ch. XHIP: An extended hipparcos compilation Astronomy Letters May 2012 38 5 331–346 10.1134/S1063773712050015 en 1063-7737 2012AstL...38..331A 1108.4971 119257644 Stock Stephan Reffert Sabine Quirrenbach Andreas Precise radial velocities of giant stars: X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search Astronomy & Astrophysics August 2018 616 A33 10.1051/0004-6361/201833111 0004-6361 2018A&A...616A..33S free 1805.04094 de Medeiros J. R. Mayor M. A catalog of rotational and radial velocities for evolved stars Astronomy and Astrophysics Supplement Series November 1999 139 3 433–460 10.1051/aas:1999401 0365-0138 1999A&AS..139..433D free Hekker S. Meléndez J. Precise radial velocities of giant stars: III. Spectroscopic stellar parameters Astronomy & Astrophysics December 2007 475 3 1003–1009 10.1051/0004-6361:20078233 0004-6361 2007A&A...475.1003H 0709.1145 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 2008MNRAS.389..869E 0806.2878 14878976 free Category:Delphinus Category:K0III stars Delphini, 17 199253 103294 8011 Category:Suspected variables BD+13 4572