18 Aquarii

Yellowish star in the constellation Aquarius 18 Aquarii J2000 Aquarius 21 24 11.49206 −12 52 41.1928 5.49 main sequence F0 V +0.29 −3.0 6.9 +89.60 +8.62 21.23 0.29 2.12 1.54 11.8 7,194 –0.16 3.98 138 480 18 Aqr −13°5923 1562 203705 105668 8187 164364 18 Aqr 2018-02-02 18+Aqr 18 Aquarii is a single, yellow-white hued star in the equatorial constellation of Aquarius. The designation is from the catalogue of English astronomer John Flamsteed, first published in 1712. The star is faintly visible to the naked eye with an apparent visual magnitude of 5.49 and is located about 154 ly pc off on from Earth. This is an F-type main sequence star with a stellar classification of F0 V. It is an estimated 480 million years old and has a high rate of spin with a projected rotational velocity of 138 km/s. The star has 1.54 times the mass of the Sun and is radiating 11.8 times the Sun's luminosity from its photosphere at an effective temperature of 7,194 K. References F. van Leeuwen Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653–664 2007A&A...474..653V 10.1051/0004-6361:20078357 . 0708.1752 November 2007 18759600 105668 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 10.1088/0004-637X/804/2/146 1501.03154 33401607 . Houk Nancy Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars 4 Ann Arbor Dept. of Astronomy, University of Michigan 1978 1988mcts.book.....H . 1 Johnson H. L. Iriarte B. Mitchell R. I. Wisniewskj W. Z. UBVRIJKL photometry of the bright stars Communications of the Lunar and Planetary Laboratory 4 99 1966 99 1966CoLPL...4...99J . Royer F. Zorec J. Gómez A. E. Rotational velocities of A-type stars. III. Velocity distributions Astronomy and Astrophysics 463 2 671–682 10.1051/0004-6361:20065224 2007A&A...463..671R astro-ph/0610785 . February 2007 18475298 1 Soubiran C. Le Campion J.-F. Cayrel de Strobel G. Caillo A. The PASTEL catalogue of stellar parameters Astronomy and Astrophysics 515 A111 10.1051/0004-6361/201014247 2010A&A...515A.111S . 1004.1069 June 2010 118362423 The VAST Survey - III. The multiplicity of A-type stars within 75 pc Monthly Notices of the Royal Astronomical Society De Rosa R. J. Patience J. Wilson P. A. Schneider A. Wiktorowicz S. J. Vigan A. Marois C. Song I. MacIntosh B. Graham J. R. Doyon R. Bessell M. S. Thomas S. Lai O. 437 2 1216 2014 2014MNRAS.437.1216D 10.1093/mnras/stt1932 free 1311.7141 . Zorec J. Royer F. Rotational velocities of A-type stars. IV. Evolution of rotational velocities Astronomy and Astrophysics 2012 537 A120 10.1051/0004-6361/201117691 free 1201.2052 2012A&A...537A.120Z External links Image 18 Aquarii Category:F0V stars Category:Aquarius (constellation) Category:Durchmusterung objects Aquarii, 018 203705 105668 8187