11 Orionis

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11 Orionis
Orion constellation map.svg
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) 4.65[2]
Spectral type B9 IV[3]
U−B color index -0.10[4]
B−V color index -0.06[4]
Variable type α² CVn[5]
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[2]
Luminosity220[2] L
Temperature9,520[3] K
Rotational velocity (v sin i)36[7] km/s
Other designations
BD+15°732, FK5 1140, GC 6191, HIP 23607, HR 1638, HD 32549, NSV 1818, SAO 94290, V1032 Ori
Database references

11 Orionis (11 Ori) is a blue supergiant star in the constellation Orion. Its apparent magnitude is 4.65[2] and it is approximately 365 light years away based on parallax.[1] It is a chemically peculiar star known as an Ap star, with enhanced Silicon and Chromium lines in its spectrum.[8]

It is an α² CVn variable, ranging from 4.69 to 4.65 magnitude with a period of 4.64 days.[5]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d 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
  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: 297. arXiv:0903.5134Freely accessible. Bibcode:2009A&A...501..297Z. doi:10.1051/0004-6361/200811147. 
  4. ^ 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
  5. ^ a b 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. 
  6. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336. 
  7. ^ 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. 
  8. ^ 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:1402.1021Freely accessible. Bibcode:2014A&A...562A..65S. doi:10.1051/0004-6361/201322300.