17 Aquarii

Star in the constellation Aquarius 17 Aquarii J2000 Aquarius 21 22 56.25866 −09 19 09.5823 5.99 K4/5 III 1.516 0.008 18.2 2.9 −29.659 −29.022 4.9125 0.1260 −0.73 7,290 d 0.4 17 Aqr A 495.46 3951 14 commas −0.10 0.06 1.74 0.14 17 Aqr −09°5728 3705 203525 105574 8175 145351 17+Aqr 17 Aquarii, abbreviated 17 Aqr, is a spectroscopic binary star system in the constellation of Aquarius. 17 Aquarii is the Flamsteed designation. It appears to the naked eye as a faint sixth magnitude star, having a combined apparent visual magnitude of 5.99. The distance to 17 Aqr can be estimated from its annual parallax shift of 4.9 mas, which yields a separation of around 660 light years. It is moving further away with a heliocentric radial velocity of 18 km/s. A preliminary orbit for the pair gives a period of 7290 days years 2 off out and an eccentricity of 0.4. The primary component is an aging giant star with a stellar classification of K4/5 III. It is radiating 495 times the Sun's luminosity from its photosphere at an effective temperature of 3,951 K. References 17 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 . 1 Famaey B. Pourbaix D. Frankowski A. Van Eck S. Mayor M. Udry S. Jorissen H. A. Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations Astronomy and Astrophysics 498 2 627–640 2009 0901.0934 2009A&A...498..627F 10.1051/0004-6361/200810698 free 18739721 Wu Yue Singh H. P. Prugniel P. Gupta R. Koleva M. 1 Coudé-feed stellar spectral library – atmospheric parameters Astronomy & Astrophysics 525 A71 2010 2011A&A...525A..71W 1009.1491 10.1051/0004-6361/201015014 free 53480665 Gontcharov G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system Astronomy Letters 32 11 759–771 2006 2006AstL...32..759G 1606.08053 10.1134/S1063773706110065 119231169 Houk N. Swift C. Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars Michigan Spectral Survey 5 1999 . 1999MSS...C05....0H Category:K-type giants Category:Spectroscopic binaries Category:Aquarius (constellation) Category:Durchmusterung objects Aquarii, 017 203525 105574 8175