Star in the constellation Monoceros
18 Monocerotis is abinary star system located about halfway fromOrion's Belt toProcyon ,[ 6] equatorial constellation ofMonoceros .[ 11] apparent visual magnitude of 4.47,[ 2] [ 1] light years away from the Sun based onparallax . The system is receding from the Earth with a heliocentricradial velocity of +11 km/s.[ 4]
It is reported as a single-linedspectroscopic binary with anorbital period of 1,760.9 days (4.8 years) and aneccentricity of 0.4.[ 6] K-type giant star with astellar classification of K0+IIIaBa0.2,[ 3] spectrum displays strong violet lines ofCN .[ 6] [ 1] radius of the Sun . It is radiating 311[ 1] luminosity of the Sun from its swollenphotosphere at aneffective temperature of 4,750 K.[ 9]
^a b c d e f g h i j 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 . ^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 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data".Astronomy & Astrophysics .430 :165– 186.arXiv :astro-ph/0409579 Bibcode :2005A&A...430..165F .doi :10.1051/0004-6361:20041272 .S2CID 17804304 . ^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 Griffin, R. F. (1984). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 59: 18 Monocerotis".The Observatory .104 : 267.Bibcode :1984Obs...104..267G . ^ ESA (1997). "The Hipparcos and Tycho Catalogues".VizieR On-line Data Catalog .Bibcode :1997yCat.1239....0E . ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version".Astronomy & Astrophysics .591 : A118.arXiv :1605.07384 Bibcode :2016A&A...591A.118S .doi :10.1051/0004-6361/201628497 .S2CID 119258214 . ^a b Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue".Astronomy Letters .34 (11):785– 796.arXiv :1607.00619 Bibcode :2008AstL...34..785G .doi :10.1134/S1063773708110078 .S2CID 73524157 . Vizier catalog entry ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars".Astronomy and Astrophysics Supplement Series .139 (3): 433.arXiv :astro-ph/0608248 Bibcode :1999A&AS..139..433D .doi :10.1051/aas:1999401 . Vizier catalog entry ^a b "18 Mon" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2019-05-30 .
