16 Aquarii

Star in the constellation Aquarius 16 Aquarii J2000 Aquarius 21 21 04.31919 −04 33 36.4532 5.869 G7 III 0.912 0.001 −6.0 2.9 −9.86 +11.22 9.5319 0.1192 1.08 2.34 0.13 7.86 0.26 37.4 2.3 5096 35 commas 0.01 0.10 3.03 0.04 1.79 740 130 15 Aqr −05°5524 203222 105412 8160 145317 16+Aqr 16 Aquarii, abbreviated 16 Aqr, is a star in the constellation of Aquarius. 16 Aquarii is the Flamsteed designation. It is a faint star, just visible to the naked eye, with an apparent visual magnitude of 5.869. Based upon an annual parallax shift of 9.5 mas, it is located about 342 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −6 km/s, and is predicted to come within 66.91 pc ly off 2 out in 6.8 million years. At the estimated age of 740 million years, this is an aging giant star currently on the red giant branch with a stellar classification of G7 III. This indicates it has exhausted the supply of hydrogen at its core and is generating energy via hydrogen fusion along a shell surrounding a hot core of inert helium. The star has 2.3 times the mass of the Sun and has expanded to 8 times the Sun's radius. It is radiating 37 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,096 K. References 16 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 . Soubiran Caroline Le Campion Jean-François Brouillet Nathalie Chemin Laurent The PASTEL catalogue: 2016 version Astronomy & Astrophysics 591 A118 2016 2016A&A...591A.118S 1605.07384 10.1051/0004-6361/201628497 119258214 . 1 Reffert Sabine Bergmann Christoph Quirrenbach Andreas Trifonov Trifon Künstler Andreas Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity Astronomy & Astrophysics 574 A116 2015 2015A&A...574A.116R 1412.4634 10.1051/0004-6361/201322360 59334290 . Precise radial velocities of giant stars. III. Spectroscopic stellar parameters Astronomy and Astrophysics Hekker S. Meléndez J. 475 3 1003 2007 2007A&A...475.1003H 0709.1145 10.1051/0004-6361:20078233 10436552 . 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 . Houk N. Swift C. Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars Michigan Spectral Survey 5 1999 . 1999MSS...C05....0H Category:G7III stars Category:Aquarius (constellation) Category:Durchmusterung objects Aquarii, 016 203222 105412 8160