12 Hydrae

Star in the constellation Hydra Hydra constellation map.svg center 320 right Red circle.svg 10 12 Hydrae 880 295 Location of 12 Hydrae (circled in red) J2000 Hydra 08 46 22.54441 −13 32 51.8051 4.32 red giant branch G8 IIIb CN-1 0.900 0.015 −8.5 0.7 +10.316 −15.012 15.8840 0.3987 +0.26 Aa Ab 1592 806 commas days 0.0116 0.057 0.40 0.26 58 10 91 16 49194 664 commas 103 34 1.83 10.8 71 5,105 3.13 −0.01 4.6 0.2 410 D Hya 12 Hya −13°2673 74918 43067 3484 154622 J08464-1333 D+Hya 12 Hydrae is a probable astrometric binary star system located 205 light years away from the Sun in the equatorial constellation of Hydra. It has the Bayer designation D Hydrae; 12 Hydrae is the Flamsteed designation. This system is visible to the naked eye as a faint, yellow-hued star with a combined apparent visual magnitude of 4.32. It is moving closer to the Earth with a heliocentric radial velocity of −8.5 km/s. This was found to be a double star by R. A. Rossiter in 1953, with the magnitude 13.7 companion having an angular separation of 26.8 arcsecond along a position angle of 266°, as of 2016. The brighter, magnitude 4.32 component A is a spectroscopic binary. As of 2009, the orbital solution for this pair is of low quality, giving a period of roughly 1592 days years 0 out off and an eccentricity of around 0.4. The primary component is an aging giant star with a stellar classification of G8 IIIb CN-1, where the suffix notation indicates an underabundance of the cyanogen molecule. It is 410 million years old with 1.8 times the mass of the Sun. After exhausting the hydrogen at its core and evolving off the main sequence, the star has swollen to 11 times the Sun's radius. It is radiating 71 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of commas 5105 K. References 5735066776630042112 12 Hya May 1, 2019 Stassun Keivan G. Oelkers Ryan J. Paegert Martin Torres Guillermo Pepper Joshua De Lee Nathan Collins Kevin Latham David W. Muirhead Philip S. Chittidi Jay Rojas-Ayala Bárbara Fleming Scott W. Rose Mark E. Tenenbaum Peter Ting Eric B. Kane Stephen R. Barclay Thomas Bean Jacob L. Brassuer C. E. Charbonneau David Ge Jian Lissauer Jack J. Mann Andrew W. McLean Brian Mullally Susan Narita Norio Plavchan Peter Ricker George R. Sasselov Dimitar Seager S. 1 The Revised TESS Input Catalog and Candidate Target List The Astronomical Journal 2019 158 4 138 10.3847/1538-3881/ab3467 free 1905.10694 2019AJ....158..138S Fetherolf Tara Pepper Joshua Simpson Emilie Kane Stephen R. Močnik Teo English John Edward Antoci Victoria Huber Daniel Jenkins Jon M. Stassun Keivan Twicken Joseph D. Vanderspek Roland Winn Joshua N. Variability Catalog of Stars Observed during the TESS Prime Mission The Astrophysical Journal Supplement Series 2023 268 1 4 10.3847/1538-4365/acdee5 free 2208.11721 2023ApJS..268....4F Khalatyan A. Anders F. Chiappini C. Queiroz A. B. A. Nepal S. Dal Ponte M. Jordi C. Guiglion G. Valentini M. Torralba Elipe G. Steinmetz M. Pantaleoni-González M. Malhotra S. Jiménez-Arranz Ó. Enke H. Casamiquela L. Ardèvol J. Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost Astronomy and Astrophysics 2024 691 A98 10.1051/0004-6361/202451427 free 2407.06963 2024A&A...691A..98K Keenan Philip C. McNeil Raymond C. The Perkins catalog of revised MK types for the cooler stars Astrophysical Journal Supplement Series 71 245 1989 1989ApJS...71..245K 10.1086/191373 Ammler-von Eiff Matthias Reiners Ansgar New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars? Astronomy & Astrophysics 1204.2459 542 A116 June 2012 . 10.1051/0004-6361/201118724 2012A&A...542A.116A 53666672 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 1 Hartkopf W. I. Mason B. D. Worley C. E. June 30, 2006 Sixth Catalog of Orbits of Visual Binary Stars United States Naval Observatory http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 2017-06-02 . 2017-08-01 https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 dead Seventh list of new Southern double stars found at the Lamont-Hussey Observatory of the University of Michigan at Bloemfontein, South Africa. Rossiter R. A. Astronomical Journal . 58 29–30 February 1953 10.1086/106804 1953AJ.....58...29R XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters . 38 5 331 2012 2012AstL...38..331A 1108.4971 10.1134/S1063773712050015 119257644 Category:Hydra (constellation) Hydrae, 12 Hydrae, D 3484 074918 012097 BD-13 2673 Category:Double stars Category:Spectroscopic binaries Category:G8III stars Category:Astrometric binaries