Star in the constellation Orion
Yellow φ2 Orionis with nebulosity east ofφ1 Orionis and south-east ofλ Orionis Phi2 Orionis is astar in theconstellation Orion , where it forms a small triangle on thecelestial sphere with the nearbyMeissa andPhi1 Orionis .[ 8] apparent visual magnitude of 4.081.[ 2] parallax shift of 28.67 mas ,[ 6] light-years from theSun .
This is an evolvedG-type star ofstellar classification G8 III-IV,[ 3] evolutionary stage between asubgiant (IV) and agiant star (III). It is estimated to be 6.9 billion years old, has 1.07 times themass of the Sun ,[ 5] Sun's radius . The star shines with 30 times thesolar luminosity from itsouter atmosphere at aneffective temperature ofK [ 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 atVizieR .^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.arXiv :2505.23514 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 . Retrieved2016-11-30 .{{cite web }}: CS1 maint: postscript (link )^ Kaler, James B. (February 10, 2012),"Phi-1 Orionis" ,Stars , University of Illinois, retrieved2016-11-30 .
