Star system in the constellation Orion
15 Orionis is a suspectedastrometric binary [ 11] star system in theequatorial constellation ofOrion , near the border withTaurus . It is visible to the naked eye as a faint, yellow-white hued star with anapparent visual magnitude of 4.82.[ 2] light years away from the Sun based onparallax . It is moving further from the Earth with a heliocentricradial velocity of +29 km/s,[ 5] [ 6]
The primary component is anearly F-type subgiant star with astellar classification of F2 IV,[ 4] core and has begun toevolve into agiant . It has 3.42 times themass of the Sun [ 7] Sun's radius .[ 8] projected rotational velocity of 60 km/s.[ 7] luminosity of the Sun from its expandingphotosphere at aneffective temperature of 7,161 K.[ 7]
It has one suspected companion, component B, at a separation of 0.3".[ 12]
^a b c d e 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 atVizieR .^a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system".CDS/ADC Collection of Electronic Catalogues .2237 .Bibcode :2002yCat.2237....0D . ^ Rachkovskaya, T. M. (2008). "Abundances of carbon, nitrogen, oxygen, and other elements in the atmospheres of the giants 15 ori and 22 ɛ sex".Astronomy Reports .52 (1): 53.Bibcode :2008ARep...52...53R .doi :10.1134/S106377290801006X . ^a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)".VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H .5050 .Bibcode :1995yCat.5050....0H . ^a b Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008)."Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity" .The Astronomical Journal .135 (1):209– 231.Bibcode :2008AJ....135..209M .doi :10.1088/0004-6256/135/1/209 S2CID 121883397 . ^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 . Vizier catalog entry ^a b c d e f g Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities".Astronomy and Astrophysics .537 : A120.arXiv :1201.2052 Bibcode :2012A&A...537A.120Z .doi :10.1051/0004-6361/201117691 .S2CID 55586789 . ^a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures".Astronomy and Astrophysics .352 :555– 562.arXiv :astro-ph/9911002 Bibcode :1999A&A...352..555A . Vizier catalog entry ^a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters".Astronomy & Astrophysics .525 : A71.arXiv :1009.1491 Bibcode :2011A&A...525A..71W .doi :10.1051/0004-6361/201015014 .S2CID 53480665 . ^ Mallik, Sushma V.; Parthasarathy, M.; Pati, A. K. (2003). "Lithium and rotation in F and G dwarfs and subgiants".Astronomy and Astrophysics .409 : 251.Bibcode :2003A&A...409..251M .doi :10.1051/0004-6361:20031084 . ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems",Monthly Notices of the Royal Astronomical Society 389 (2):869– 879,arXiv :0806.2878 Bibcode :2008MNRAS.389..869E ,doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" .The Astronomical Journal .122 (6): 3466.Bibcode :2001AJ....122.3466M .doi :10.1086/323920 Vizier catalog entry
