11 Orionis
Red circle.svg
Location of 11 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 04m 34.14916s[1]
Declination +15° 24′ 14.7771″[1]
Apparent magnitude (V) [2] 4.65
Spectral type B9 IV[3] or A1 Vp SiCr[4]
U−B color index −0.10[5]
B−V color index −0.06[5]
Variable type α² CVn[2]
Radial velocity (Rv)+16.80[6] km/s
Proper motion (μ) RA: +17.80[1] mas/yr
Dec.: −31.15[1] mas/yr
Parallax (π)8.93 ± 0.24[1] mas
Distance365 ± 10 ly
(112 ± 3 pc)
Absolute magnitude (MV)−0.59[7]
Radius3.6[8] R
Luminosity220[7] L
Temperature9,520[3] K
Rotational velocity (v sin i)36[9] km/s
Other designations
11 Ori, V1032 Ori, BD+15°732, FK5 1140, GC 6191, HD 32549, HIP 23607, HR 1638, SAO 94290[10]
Database references

11 Orionis is a solitary[11] Ap star in the equatorial constellation of Orion, near the border with Taurus. It is visible to the naked eye with an apparent visual magnitude of 4.65,[7] and it is located approximately 365 light years away from the Sun based on parallax.[1] The star is moving further from the Sun with a heliocentric radial velocity of +16.8 km/s.[6]

This object is a chemically peculiar star, known as an Ap star, with enhanced silicon and chromium lines in its spectrum.[12] It is an α² CVn variable, ranging from 4.65 to 4.69 magnitude with a period of 4.64 days.[2] The magnetic field measured from metal lines has a strength of +160±390 G.[13]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....1.2025S.
  3. ^ a b 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. I. Calibration of the (λ_1, D) parameters into Teff". Astronomy and Astrophysics. 501 (1): 297–320. arXiv:0903.5134. Bibcode:2009A&A...501..297Z. doi:10.1051/0004-6361/200811147. S2CID 14969137.
  4. ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  5. ^ a b Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
  6. ^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. ISBN 9780598216885. LCCN 54001336.
  7. ^ a b c 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. S2CID 119257644. Vizier catalog entry
  8. ^ Pasinetti Fracassini, L. E.; et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics (Third ed.). 367 (2): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
  9. ^ 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.
  10. ^ "11 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 September 2012.
  11. ^ 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.
  12. ^ Stigler, Ch.; Maitzen, H. M.; Paunzen, E.; Netopil, M. (2014). "Spectrophotometric analysis of the 5200 Å region for peculiar and normal stars". Astronomy & Astrophysics. 562: A65. arXiv:1402.1021. Bibcode:2014A&A...562A..65S. doi:10.1051/0004-6361/201322300. S2CID 55166743.
  13. ^ Romanyuk, I. I.; et al. (July 2016). "Results of magnetic field measurements of CP-stars performed with the 6-m telescope. III. Observations in 2009". Astrophysical Bulletin. 71 (3): 302–313. Bibcode:2016AstBu..71..302R. doi:10.1134/S1990341316030056. S2CID 125202761.