HD 82785
Star in the constellation Antlia
HD 82785 is star in the southern constellation of Antlia . With an apparent visual magnitude of 6.43,[ 2] it is near the lower limit of visibility to the naked eye. The distance to this star, based on parallax measurements, is 240 light years . It is drifting further away from the Sun with a radial velocity of 28 km/s,[ 1] having come to within 142 light-years some 1.7 million years ago. It has an absolute magnitude of 2.06.[ 4]
This F-type star has a stellar classification of F2IV/V,[ 3] displaying a blended luminosity class of a main sequence star combined to a more evolved subgiant star . It is 1.5[ 5] billion years old and is spinning with a projected rotational velocity of 36 km/s.[ 6] The star has 1.68[ 5] times the mass and 2.43[ 1] times the radius of the Sun. HD 82785 is radiating 11.7[ 1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,869 K.[ 5]
There is a magnitude 9.21 star positioned at an angular separation of 56.0″ along a position angle of 205° from the brighter component, as of 2016. This companion was first reported by W. S. Jacob in 1847.[ 7]
References
^ a b c d e f g h i j k Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics . 616 . A1. arXiv :1804.09365 . Bibcode :2018A&A...616A...1G . doi :10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR .
^ a b c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99, Bibcode :1966CoLPL...4...99J
^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode :1982mcts.book.....H
^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331, arXiv :1108.4971 , Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 , S2CID 119257644 .
^ a b c d e f g h Casagrande, L.; et al. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics . 530 (A138): 21. arXiv :1103.4651 . Bibcode :2011A&A...530A.138C . doi :10.1051/0004-6361/201016276 . S2CID 56118016 .
^ a b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics , 463 (2): 671–682, arXiv :astro-ph/0610785 , Bibcode :2007A&A...463..671R , doi :10.1051/0004-6361:20065224 , S2CID 18475298
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal , 122 (6): 3466–3471, Bibcode :2001AJ....122.3466M , doi :10.1086/323920 .
External links