From Wikipedia, the free encyclopedia
Star in the constellation Orion
Yellow φ2 Orionis with nebulosity east of φ1 Orionis and south-east of λ Orionis Phi2 Orionis is a star in the constellation Orion , where it forms a small triangle on the celestial sphere with the nearby Meissa and Phi1 Orionis .[ 8] apparent visual magnitude of 4.081.[ 2] parallax shift of 28.67 mas ,[ 6] light-years from the Sun .
This is an evolved G-type star of stellar classification G8 III-IV,[ 3] evolutionary stage between a subgiant (IV) and a giant star (III). It is estimated to be 6.9 billion years old, has 1.07 times the mass of the Sun ,[ 5] Sun's radius . The star shines with 30 times the solar luminosity from its outer atmosphere at an effective temperature of K [ 6]
^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .^ a b c d Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars , 8 : 59, Bibcode :1984SAAOC...8...59C . ^ a b Frasca, A.; et al. (December 2009), "REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics , 508 (3): 1313–1330, arXiv :0911.0760 Bibcode :2009A&A...508.1313F , doi :10.1051/0004-6361/200913327 , S2CID 118361131 . ^ Charbonnel, Corinne; et al. (April 1998), "Mixing processes during the evolution of red giants with moderate metal deficiencies: the role of molecular-weight barriers", Astronomy and Astrophysics , 332 : 204–214, arXiv :astro-ph/9712207 Bibcode :1998A&A...332..204C . ^ a b Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics , 574 : A50, arXiv :1410.6422 Bibcode :2015A&A...574A..50J , doi :10.1051/0004-6361/201424474 , S2CID 53666931 , A50. ^ a b c d e Baines, Ellyn K.; Clark, James H., III; Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar (2023-12-01). "33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble" . The Astronomical Journal . 166 (6): 268. Bibcode :2023AJ....166..268B . doi :10.3847/1538-3881/ad08be ISSN 0004-6256 . {{cite journal }}: CS1 maint: multiple names: authors list (link )^ "phi02 Ori" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2016-11-30 .{{cite web }}: CS1 maint: postscript (link )^ Kaler, James B. (February 10, 2012), "Phi-1 Orionis" , Stars , University of Illinois, retrieved 2016-11-30 .
