27 Monocerotis
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 07h59m44.15308s[1] |
| Declination | −3° 40′ 46.5065″[1] |
| Apparent magnitude(V) | 4.93[2] |
| Characteristics | |
| Spectral type | K2III[3] |
| U−Bcolor index | +1.21[4] |
| B−Vcolor index | +1.21[4] |
| Astrometry | |
| Radial velocity(Rv) | −28.02[5]km/s |
| Proper motion(μ) | RA:−54.379[1]mas/yr Dec.:−3.132[1]mas/yr |
| Parallax(π) | 10.2424 ± 0.1791mas[1] |
| Distance | 318 ± 6ly (98 ± 2pc) |
| Absolute magnitude(MV) | 0.30[2] |
| Details[6] | |
| Mass | 1.28±0.20M☉ |
| Radius | 13.41±1.11R☉ |
| Luminosity | 148.283[1]L☉ |
| Surface gravity(logg) | 2.40±0.04cgs |
| Temperature | 4,568±12K |
| Metallicity[Fe/H] | −0.25±0.03dex |
| Rotational velocity(vsini) | 1.76±0.56km/s |
| Age | 3.87±1.86Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
27 Monocerotisis a single[8]starlocated about 318[1]light yearsaway from the Sunstarin theequatorialconstellationofMonoceros.It is visible to the naked eye as a faint, orange-hued star with anapparent visual magnitudeof 4.93.[2]The star is advancing toward the Earth with a heliocentricradial velocityof −28 km/s.[5]
This object is an aginggiant star,most likely (94% chance) on thered giant branch,[9]with astellar classificationof K2III.[3]Having exhausted the hydrogen at itscore,the star hasevolvedoff themain sequenceand expanded to over 13 times thegirth of the Sun.It is around four billion years old with 1.3 times theSun's mass.[6]The star is radiating 148[1]times theSun's luminosityfrom its swollenphotosphereat aneffective temperatureof 4,568 K.[6]
References
[edit]- ^abcdefghBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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 sourceatVizieR.
- ^abcAnderson, 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.S2CID119257644.Vizier catalog entry
- ^abHoffleit, 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.
- ^abMallama, A. (2014). "Sloan Magnitudes for the Brightest Stars".The Journal of the American Association of Variable Star Observers.42(2): 443.Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ^abJofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (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.S2CID53666931.Vizier catalog entry
- ^abcJofré, E.; et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets".Astronomy and Astrophysics.574:A50.arXiv:1410.6422.Bibcode:2015A&A...574A..50J.doi:10.1051/0004-6361/201424474.S2CID53666931.
- ^"20 Mon".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2019-05-31.
- ^Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems",Monthly Notices of the Royal Astronomical Society,389(2): 869,arXiv:0806.2878,Bibcode:2008MNRAS.389..869E,doi:10.1111/j.1365-2966.2008.13596.x,S2CID14878976.
- ^Stock, S.; Reffert, S.; Quirrenbach, A. (August 2018). "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search".Astronomy & Astrophysics.616:15.arXiv:1805.04094.Bibcode:2018A&A...616A..33S.doi:10.1051/0004-6361/201833111.S2CID119361866.A33.
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