16 Delphini

Star in the constellation Delphinus 16 Delphini J2000 Delphinus 20 55 38.5698 +12 34 06.877 5.540.01 main sequence A5 V +0.11 +0.09 2.04.3 16.4866 0.06 +39.558 +27.772 +1.63 2.00.1 1.90.1 18.7 9,093309 4.100.14 −0.01 159 400150 215 16 Del +12°2414 +12°4501 29202 199254 103298 8012 106666 J20556+1234A 16+Del 16 Delphini is a star in the northern constellation of Delphinus. It has an apparent magnitude of 5.54, making it faintly visible to the naked eye. The star is relatively close at a distance of 198 light years but is receding with a poorly constrained radial velocity of 2 km/s. 16 Delphini is a chemically peculiar A-type main-sequence star with a stellar classification of A5 V. It has twice the Sun's mass, 1.9 times its radius, and shines at 18.7 solar luminosity. This yields an effective temperature of 9,039 K, giving it a white glow. 16 Del is 400 million years old – 56.5% through its main sequence lifetime – and spins rapidly with a projected rotational velocity of 159 km/s. 16 Del has a companion that was first discovered by John Herschel and was even noted to be a spectroscopic binary. It is now considered to be a single star. References 1757995264614220672 Oja T. UBV photometry of stars whose positions are accurately known. VI. Astronomy and Astrophysics Supplement Series August 1991 89 415 0365-0138 1991A&AS...89..415O 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 255204555 Abt Helmut A. Morrell Nidia I. The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars The Astrophysical Journal Supplement Series July 1995 99 135 10.1086/192182 0067-0049 1995ApJS...99..135A free Gontcharov G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system Astronomy Letters November 2006 32 11 759–771 10.1134/S1063773706110065 1063-7737 2006AstL...32..759G 1606.08053 119231169 Zorec J. Royer F. Rotational velocities of A-type stars. IV. Evolution of rotational velocities Astronomy and Astrophysics January 2012 537 A120 10.1051/0004-6361/201117691 1201.2052 0004-6361 2012A&A...537A.120Z 55586789 free Gontcharov G. A. Dependence of kinematics on the age of stars in the solar neighborhood Astronomy Letters December 2012 38 12 771–782 10.1134/S1063773712120031 0320-0108 2012AstL...38..771G 1606.08814 255201789 Royer F. Zorec J. Gómez A. E. Rotational velocities of A-type stars: III. Velocity distributions Astronomy & Astrophysics February 2007 463 2 671–682 10.1051/0004-6361:20065224 0004-6361 2007A&A...463..671R free astro-ph/0610785 Allende Prieto C. Lambert D. L. Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures Astronomy and Astrophysics December 1999 352 555–562 0004-6361 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 12 May 2015 804 2 146 10.1088/0004-637X/804/2/146 0004-637X 2015ApJ...804..146D 1501.03154 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 Mason Brian D. Wycoff Gary L. Hartkopf William I. Douglass Geoffrey G. Worley Charles E. The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog The Astronomical Journal December 2001 122 6 3466–3471 10.1086/323920 0004-6256 2001AJ....122.3466M free Category:Delphinus Category:A5V stars Delphini, 16 199254 103298 8012 BD+12 4501 Category:Population I stars