12 Persei

Star in the constellation Perseus Perseus constellation map.svg center 280 right Red circle.svg 10 12 Persei 780 667 Location of 12 Persei (circled) J2000.0 Perseus 02 42 14.91569 +40 11 38.1898 4.94 main sequence F9 V +0.56 +0.08 -23.04 0.04 −17.20 −183.30 41.34 0.43 +2.99 330.98 d 53.18 mas 0.663 127.17 12 Per A 1.382 0.019 1.55 3.02 4.20 0.10 6195 200 ≥0.35 13 1.12 12 Per B 1.240 0.017 1.31 1.86 4.30 0.10 6000 200 12 Per +39° 610 2187 105.6 АВ 16739 12623 788 55793 12+Per 12 Persei (12 Per) is a double-lined spectroscopic binary star system in the northern constellation Perseus. Its combined apparent magnitude is 4.94, which means it can be viewed with the naked eye. Based upon parallax measurements, this system is about 79 light years away from the Sun. The magnitude difference between the two components is estimated to be 0.51. Based upon this, the primary has a mass around 138% of the Sun, 155% of the Sun's radius, and shines with three times the Sun's luminosity. The smaller secondary component is also larger than the Sun, with 124% of the Sun's mass, 131% of the radius of the Sun, and has 186% of the Sun's luminosity. The stellar classification of the primary is F9 V, which suggests it is an F-type main sequence star. The pair have an estimated age of just over a billion years. The pair orbit each other with a period of 331 days and an eccentricity of 0.663. The semimajor axis of their orbit is 1.27 AU, which means the inner stability radius for a hypothetical planet orbiting the pair would be at 4.35 AU. This lies outside the habitability zone for this system. References 12623 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. Abt Helmut A. MK Classifications of Spectroscopic Binaries The Astrophysical Journal Supplement 180 117–118 2009 1 10.1088/0067-0049/180/1/117 2009ApJS..180..117A 122811461. Bernacca P. L. Perinotto M. A catalogue of stellar rotational velocities Contributi Osservatorio Astronomico di Padova in Asiago 239 1 1970 1 1970CoAsi.239....1B. 1 Pourbaix D. Tokovinin A. A. Batten A. H. Fekel F. C. Hartkopf W. I. Levato H. Morrell N. I. Torres G. Udry S. SB9: The ninth catalogue of spectroscopic binary orbits Astronomy and Astrophysics 424 727–732 September 2004 10.1051/0004-6361:20041213 2004A&A...424..727P astro-ph/0406573 119387088. Leushin V. V. Kuznetsov M. K. Chemical Composition and Evolutionary Status of Spectral Binary Star 12 Per Odessa Astronomical Publications 21 57 2008 2008OAP....21...57L. 1 Bagnuolo William G. Jr. ten Brummelaar Theo A. McAlister H. A. Gies Douglas R. Ridgway Stephen T. The star 12 Persei and separated fringe packet binaries (SFPB) Advances in Stellar Interferometry Monnier John D. Schöller Markus Danchi William C. Proceedings of the SPIE 6268 62682T June 2006 62682T 10.1117/12.672275 2006SPIE.6268E..2TB 124256072. 1 Jaime Luisa G. Aguilar Luis Pichardo Barbara Habitable zones with stable orbits for planets around binary systems Monthly Notices of the Royal Astronomical Society 443 1 260–274 September 2014 10.1093/mnras/stu1052 free 2014MNRAS.443..260J 1401.1006. Mermilliod J.-C. Compilation of Eggen's UBV data, transformed to UBV (unpublished) SIMBAD Astronomical Database 1986 1986EgUBV........0M. * 12 Per 2016-07-21 cs2 Category:Perseus (constellation) Persei, 12 Persei, 12 Category:Spectroscopic binaries 012623 105.6 АВ 0788 016739 BD+39 0610 Category:F9V stars