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51 Orionis

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This article is about b Orionis. Not to be confused with β (beta) Orionis.
51 Orionis
Location of 51 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 42m 28.63240s[1]
Declination 01° 28′ 28.6714″[1]
Apparent magnitude (V) 4.90[2]
Characteristics
Spectral type K1III[3]
U−B color index 1.06[2]
B−V color index 1.17[2]
Astrometry
Radial velocity (Rv) 87.55[4] km/s
Proper motion (μ) RA: −54.741[1] mas/yr
Dec.: −14.732[1] mas/yr
Parallax (π)10.9178 ± 0.2225 mas[1]
Distance299 ± 6 ly
(92 ± 2 pc)
Absolute magnitude (MV)0.13[5]
Details
Mass1.11[5] M☉
Radius19.3 0.4
−1.0[1] R☉
Luminosity132±3[1] L☉
Surface gravity (log g)2.24[6] cgs
Temperature4,458 92
−51[1] K
Metallicity [Fe/H]−0.45[6] dex
Rotational velocity (v sin i)1.1[7] km/s
Age4.06[8] Gyr
Other designations
b Ori, 51 Ori, BD 01°1105, FK5 2427, GC 7136, HD 37984, HIP 26885, HR 1963, SAO 113056[9]
Database references
SIMBADdata

51 Orionis is a single[10] star in the equatorial constellation of Orion.[9] It has the Bayer designation b Orionis, while 51 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.90.[2] It is located approximately 299 light-years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of 88 km/s.[4]

This is an aging giant star with a stellar classification of K1III,[3] having exhausted the supply of hydrogen at its core and expanded to 19 times the Sun's radius.[1] It is four[8] billion years old with 1.11[5] times the mass of the Sun. The star is radiating 132[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,458 K.[1]

References

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  1. ^ a b c d e f g h i j k l 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. ^ 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.
  3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050 (5th Revised ed.). Bibcode:1995yCat.5050....0H.
  4. ^ a b Massarotti, Alessandro; et al. (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.
  5. ^ a b c Da Silva, Ronaldo; et al. (2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy & Astrophysics. 580: A24. arXiv:1505.01726. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770. S2CID 119216425. Vizier catalog entry
  6. ^ a b Wu, Yue; et al. (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.
  7. ^ 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
  8. ^ a b Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
  9. ^ a b "51 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-29.
  10. ^ 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.
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