15 Aquarii

Star in the constellation Aquarius 15 Aquarii J2000 Aquarius 21 18 11.07309 −04 31 10.1276 5.83 B7 III or B5 V −0.130 0.005 −9.0 1.0 +12.11 +12.94 4.5632 0.1345 −1.62 5.7 0.2 3.4 821.67 14,318 3.84 20 65.2 25.1 15 Aqr −05°5512 202753 105164 8141 145278 15+Aqr 15 Aquarii, abbreviated 15 Aqr, is a single, blue-white star in the zodiac constellation of Aquarius. 15 Aquarii is the Flamsteed designation. It is a dim star that is just visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.83. Based upon an annual parallax shift of 4.6 mas, it is located around 710 light years away. At that distance, the visual magnitude is diminished by an extinction of 0.18 due to interstellar dust. It is moving closer to the Earth with a heliocentric radial velocity of −9 km/s. Relative to its neighbors, 15 Aqr has a peculiar velocity of 28.7 2.9 3.1 km/s and may (62% chance) be a runaway star. Hube (1970) found a stellar classification of B7 III for this star, which would suggest it is a B-type giant star. However, the Bright Star Catalogue (1964) listed it as a B-type main-sequence star with a class of B5 V, and multiple sources use this instead. The star is roughly 65 million years old with a projected rotational velocity of 20 km/s. It has an estimated 5.7 times the mass of the Sun and about 3.4 times the Sun's radius. 15 Aquarii is radiating 822 times the Sun's luminosity from its photosphere at an effective temperature of 14,318 K. References 15 Aqr October 22, 2018 XHIP: An extended Hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 10.1134/S1063773712050015 1108.4971 119257644 . van Leeuwen F. Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653–664 2007 0708.1752 2007A&A...474..653V 10.1051/0004-6361:20078357 18759600 . The radial velocities of 335 late B-type stars Hube Douglas P. Memoirs of the Royal Astronomical Society 72 233 1970 1970MmRAS..72..233H . Spatial distribution and kinematics of OB stars Gontcharov G. A. Astronomy Letters 38 11 694–706 November 2012 10.1134/S1063773712110035 2012AstL...38..694G 1606.09028 119108982 . Tetzlaff N. Neuhäuser R. Hohle M. M. 1 A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun Monthly Notices of the Royal Astronomical Society 410 1 190–200 January 2011 2011MNRAS.410..190T 1007.4883 10.1111/j.1365-2966.2010.17434.x free 118629873 . 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 free 2008MNRAS.389..869E 0806.2878 14878976 . B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch? Strom Stephen E. Wolff Sidney C. Dror David H. A. 1 The Astronomical Journal 129 2 809–828 2005 10.1086/426748 astro-ph/0410337 2005AJ....129..809S 15059129 . 1 Pasinetti Fracassini L. E. Pastori L. Covino S. Pozzi A. Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) Third Astronomy and Astrophysics 367 521–524 February 2001 2001A&A...367..521P astro-ph/0012289 10.1051/0004-6361:20000451 425754 . Catalogue of Bright Stars Hoffleit Dorrit Yale University Observatory New Haven, Conn. 1964 3rd revised 1964cbs..book.....H . Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system Gontcharov G. A. Astronomy Letters 32 11 759–771 2006 2006AstL...32..759G 1606.08053 10.1134/S1063773706110065 119231169 . 1 Takeda Yoichi Kambe Eiji Sadakane Kozo Masada Seiji Oxygen and Neon Abundances of B-Type Stars in Comparison with the Sun Publications of the Astronomical Society of Japan 62 5 1239–1248 October 2010 2010PASJ...62.1239T 1008.1220 10.1093/pasj/62.5.1239 . Category:B-type giants Category:Aquarius (constellation) Category:Durchmusterung objects Aquarii, 015 202753 105164 8141 Category:Runaway stars