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Alnilam lichts up NGC 1990.
Photograph bi Glen Youman
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Richt ascension 05h 36m 12.8s[1]
Declination −01° 12′ 06.9″[1]
Apparent magnitude (V) 1.69[2] (1.64 - 1.74[3])
Spectral type B0 Ia[4]
U−B colour index −1.03[2]
B−V colour index −0.18[2]
Variable teep α Cygni[3]
Radial velocity (Rv)25.9[5] km/s
Proper motion (μ) RA: 1.49[1] mas/yr
Dec.: −1.06[1] mas/yr
Parallax (π)1.65 ± 0.45[1] mas
Distanceapprox. 2,000 ly
(approx. 600 pc)
Absolute magnitude (MV)−6.95[6]
Mass30-64.5[7] M
Radius28.6-42.0[7] R
Luminosity389,000-832,000[7] L
Surface gravity (log g)3.0[7] cgs
Temperatur27,000[7][8] K
Rotational velocity (v sin i)40-70[7] km/s
Age5.7[9] Myr
Ither designations
Alnilam, ε Ori, 46 Orionis, 112 G Orionis, HR 1903, BD -01°969, HD 37128, SAO 132346, FK5 210, HIP 26311, TD1 4963, 参宿二
Database references

Alnilam is a lairge blue supergiant starn some 1,340 licht years distant in the constellation o Orion.

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. 2.0 2.1 2.2 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. 3.0 3.1 Ruban, E. V.; Alekseeva, G. A.; Arkharov, A. A.; Hagen-Thorn, E. I.; Galkin, V. D.; Nikanorova, I. N.; Novikov, V. V.; Pakhomov, V. P.; Puzakova, T. Yu. (September 2006). "Spectrophotometric observations of variable stars". Astronomy Letters. 32 (9): 604–607. Bibcode:2006AstL...32..604R. doi:10.1134/S1063773706090052. 
  4. Morgan, W. W.; Keenan, Philip C.; Kellman, Edith (1943). "AN ATLAS OF STELLAR SPECTRA". Astrophysics Monographs. 
  5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. Searle, S. C.; Prinja, R. K.; Massa, D.; Ryans, R. (2008). "Quantitative studies of the optical and UV spectra of Galactic early B supergiants. I. Fundamental parameters". Astronomy and Astrophysics. 481 (3): 777–97. arXiv:0801.4289Freely accessible. Bibcode:2008A&A...481..777S. doi:10.1051/0004-6361:20077125. 
  7. 7.0 7.1 7.2 7.3 7.4 7.5 Raul E. Puebla; D. John Hillier; Janos Zsargó; David H. Cohen; Maurice A. Leutenegger. "X-ray, UV and optical analysis of supergiants: ε Ori". arXiv:1511.09365Freely accessible. Bibcode:2016MNRAS.456.2907P. doi:10.1093/mnras/stv2783 (inactive 2015-12-31). 
  8. Crowther, P. A.; Lennon, D. J.; Walborn, N. R. (Januar 2006). "Physical parameters and wind properties of galactic early B supergiants". Astronomy & Astrophysics. 446 (1): 279–293. arXiv:astro-ph/0509436Freely accessible. Bibcode:2006A&A...446..279C. doi:10.1051/0004-6361:20053685. 
  9. Voss, R.; Diehl, R.; Vink, J. S.; Hartmann, D. H. (2010). "Probing the evolving massive star population in Orion with kinematic and radioactive tracers". Astronomy and Astrophysics. 520: 10. arXiv:1005.3827Freely accessible. Bibcode:2010A&A...520A..51V. doi:10.1051/0004-6361/201014408. A51. 

Coordinates: Sky map 05h 36m 12.8s, −01° 12′ 06.9″