27 Monocerotis

27 Monocerotis is a single[8] star located about 318[1] light years away from the Sun star in the equatorial constellation of Monoceros. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.93.[2] The star is advancing toward the Earth with a heliocentric radial velocity of −28 km/s.[5]

27 Monocerotis
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension  07h 59m 44.15308s[1]
Declination −3° 40′ 46.5065″[1]
Apparent magnitude (V) 4.93[2]
Characteristics
Spectral type K2III[3]
U−B color index +1.21[4]
B−V color 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 ± 0.1791[1] mas
Distance318 ± 6 ly
(98 ± 2 pc)
Absolute magnitude (MV)0.30[2]
Details[6]
Mass1.28±0.20 M☉
Radius13.41±1.11 R☉
Luminosity148.283[1] L☉
Surface gravity (log g)2.40±0.04 cgs
Temperature4,568±12 K
Metallicity [Fe/H]−0.25±0.03 dex
Rotational velocity (v sin i)1.76±0.56 km/s
Age3.87±1.86 Gyr
Other designations
27 Mon, BD−03°2157, FK5 304, GC 10811, HD 65695, HIP 39079, HR 3122, SAO 135345[7]
Database references
SIMBADdata

This object is an aging giant star, most likely (94% chance) on the red giant branch,[9] with a stellar classification of K2III.[3] Having exhausted the hydrogen at its core, the star has evolved off the main sequence and expanded to over 13 times the girth of the Sun. It is around four billion years old with 1.3 times the Sun's mass.[6] The star is radiating 148[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,568 K.[6]

References
  1. 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 at VizieR.
  2. 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. Vizier catalog entry
  3. 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.
  4. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. Jofré, 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. Vizier catalog entry
  6. Jofré, 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.
  7. "20 Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-31.
  8. 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.
  9. 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. A33.
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