32 Orionis

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32 Orionis
Orion constellation map.svg
Red circle.svg

Location of 32 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 30m 47.05091s[1]
Declination 5° 56′ 53.2925″[1]
Apparent magnitude (V) 4.20[2]
Spectral type B5V[3]
U−B color index -0.56[2]
B−V color index -0.13[2]
Radial velocity (Rv) +18.60[4] km/s
Proper motion (μ) RA: +5.10[1] mas/yr
Dec.: -33.30[1] mas/yr
Parallax (π) 10.77 ± 0.64[1] mas
Distance 300 ± 20 ly
(93 ± 6 pc)
Absolute magnitude (MV) -0.63[5]
Mass 5.0[6] M
Radius 2.9[7] R
Luminosity 388[5] L
Surface gravity (log g) 4.40[8] cgs
Temperature 16,020[9] K
Rotational velocity (v sin i) 169[8] km/s
Other designations
A Orionis, BD+05°939, CCDM J05308+0557AB, GC 6813, HIP 25813, HR 1839, HD 36267, SAO 112849, WDS J05308+0557AB
Database references

32 Orionis (32 Ori) is a triple star system in the constellation Orion. The apparent magnitude of the system is 4.20[2] and it is approximately 303 light years away based on parallax.[1]

The primary is a class B5V[3] (blue main-sequence) star with a magnitude around 4.43; it is a spectroscopic binary with a period of 3.964 days and eccentricity 0.38,[10] and an estimated mass of 0.6 solar masses for the smaller companion.[11] Component B, at a separation of 1.08", is a class B7V star with a magnitude of 5.8, orbiting with the primary at a period of 614 years and eccentricity 0.22.[12][10]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  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. ^ Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. Bibcode:2007AN....328..889K. arXiv:0705.0878Freely accessible. doi:10.1002/asna.200710776. 
  5. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971Freely accessible. doi:10.1134/S1063773712050015.  Vizier catalog entry
  6. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. Bibcode:2011MNRAS.410..190T. arXiv:1007.4883Freely accessible. doi:10.1111/j.1365-2966.2010.17434.x.  Vizier catalog entry
  7. ^ 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. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002Freely accessible.  Vizier catalog entry
  8. ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. Bibcode:2015ApJ...804..146D. arXiv:1501.03154Freely accessible. doi:10.1088/0004-637X/804/2/146.  Vizier catalog entry
  9. ^ Zorec, J.; Cidale, L.; Arias, M. L.; Frémat, Y.; Muratore, M. F.; Torres, A. F.; Martayan, C. (2009). "Fundamental parameters of B supergiants from the BCD system". Astronomy and Astrophysics. 501: 297. Bibcode:2009A&A...501..297Z. arXiv:0903.5134Freely accessible. doi:10.1051/0004-6361/200811147. 
  10. ^ a b 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. Bibcode:2008MNRAS.389..869E. arXiv:0806.2878Freely accessible. doi:10.1111/j.1365-2966.2008.13596.x.  Vizier catalog entry
  11. ^ Tokovinin, A. (2008). "Comparative statistics and origin of triple and quadruple stars". Monthly Notices of the Royal Astronomical Society. 389 (2): 925. Bibcode:2008MNRAS.389..925T. arXiv:0806.3263Freely accessible. doi:10.1111/j.1365-2966.2008.13613.x. 
  12. ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774.  Vizier catalog entry