51 Orionis

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This article is about b Orionis. It is not to be confused with β Orionis.
51 Orionis
Orion constellation map.svg
Red circle.svg

Location of 51 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 42m 28.63276s[1]
Declination 1° 28′ 28.6656″[1]
Apparent magnitude (V) 4.90[2]
Spectral type K1III[3]
U−B color index +1.06[2]
B−V color index +1.17[2]
Radial velocity (Rv) +87.55[4] km/s
Proper motion (μ) RA: -54.06[1] mas/yr
Dec.: -14.60[1] mas/yr
Parallax (π) 11.11 ± 0.37[1] mas
Distance 294 ± 10 ly
(90 ± 3 pc)
Absolute magnitude (MV) 0.13[5]
Mass 1.11[5] M
Radius 17[6] R
Luminosity 125[7] L
Surface gravity (log g) 2.24[8] cgs
Temperature 4,480[8] K
Metallicity [Fe/H] -0.45[8] dex
Rotational velocity (v sin i) 1.1[9] km/s
Other designations
b Orionis, BD+01°1105, FK5 2427, GC 7136, HIP 26885, HR 1963, HD 37984, SAO 113056
Database references

51 Orionis (51 Ori) is a class K1III[3] (orange giant) star in the constellation Orion. Its apparent magnitude is 4.90[2] and it is approximately 294 light years away based on parallax.[1]


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  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). "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. ^ 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: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209. 
  5. ^ a b Da Silva, Ronaldo; Milone, André de C.; Rocha-Pinto, Helio J. (2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy & Astrophysics. 580: A24. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770.  Vizier catalog entry
  6. ^ 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. arXiv:astro-ph/9911002Freely accessible. Bibcode:1999A&A...352..555A.  Vizier catalog entry
  7. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  8. ^ a b c Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491Freely accessible. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. 
  9. ^ 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. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401.  Vizier catalog entry