126 G. Orionis, ζ Orionis, 50 Orionis, BD−02°1338, HIP 26727, SAO 132444, WDS J05407-0157
A: HD 37742, HR 1948
B: HD 37743, HR 1949
Database references
SIMBAD
AB
A
B
Alnitak is a triple star system in the constellation of Orion. It has the designations ζ Orionis, which is Latinised to Zeta Orionis and abbreviated Zeta Ori or ζ Ori, and 50 Orionis, abbreviated 50 Ori. The system is located at a distance of several hundred parsecs from the Sun and is one of the three main stars of Orion's Belt along with Alnilam and Mintaka.
The primary star, Alnitak Aa, is a hot blue supergiant with an absolute magnitude of −6.0 and is the brightest class O star in the night sky with a visual magnitude of +2.0. It has two companions—Ab and B, the latter known for the longest time and the former discovered recently, producing a combined magnitude for the trio of +1.77. The stars are members of the Orion OB1 association and the Collinder 70 [de] association.
^Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
^ abcdeVan 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.
^ abDucati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
^ abcdefghijklmnopqHummel, C. A.; Rivinius, T.; Nieva, M. -F.; Stahl, O.; Van Belle, G.; Zavala, R. T. (2013). "Dynamical mass of the O-type supergiant in ζ Orionis A". Astronomy & Astrophysics. 554: A52. arXiv:1306.0330. Bibcode:2013A&A...554A..52H. doi:10.1051/0004-6361/201321434. S2CID 53645495.
^Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384 (1): 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822. ISSN 0004-6361.
^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): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337. S2CID 119323941.
^"Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory.
^Raassen, A. J. J.; Van Der Hucht, K. A.; Miller, N. A.; Cassinelli, J. P. (2008). "XMM-Newton observations of ζ Orionis (O9.7 Ib): A collisional ionization equilibrium model". Astronomy and Astrophysics. 478 (2): 513. arXiv:0803.0873. Bibcode:2008A&A...478..513R. doi:10.1051/0004-6361:20077891. S2CID 17601299.
^Buysschaert, B.; Neiner, C.; Ramiaramanantsoa, T.; Richardson, N. D.; David-Uraz, A.; Moffat, A. F. J. (2016). "Understanding the photometric variability of ζ OriAa". Second Brite-Constellation Science Conference: Small Satellites – Big Science. 5: 101. arXiv:1610.05625. Bibcode:2017sbcs.conf..101B.
^Blazère, A.; Neiner, C.; Tkachenko, A.; Bouret, J.-C.; Rivinius, Th. (2015). "The magnetic field of ζ Orionis A". Astronomy & Astrophysics. 582: A110. arXiv:1509.02773. Bibcode:2015A&A...582A.110B. doi:10.1051/0004-6361/201526855. S2CID 62800990.
Alnitak is a triple star system in the constellation of Orion. It has the designations ζ Orionis, which is Latinised to Zeta Orionis and abbreviated Zeta...
in the constellation Orion. The nebula is located just to the south of Alnitak, the easternmost star of Orion's Belt, and is part of the much larger Orion...
light-years from the Sun in the constellation of Orion. Together with Alnitak (Zeta Orionis) and Alnilam (Epsilon Orionis), the three stars form Orion's...
2022. 800 000 times smaller angular diameter than that of Alnitak as seen from Earth. Alnitak is a blue star so it gives off a lot of light for its size...
complex, illustrating the Orion Correlation Theory. From left to right: Alnitak on the Great Pyramid of Giza Alnilam on the pyramid of Khafre Mintaka on...
brightest in Orion) and is a blue supergiant. Together with Mintaka and Alnitak, the three stars make up Orion's Belt, known by many names across many...
Second 2.23 Mintaka ε Orionis Second 1.69 Alnilam ζ Orionis Second 1.70 Alnitak η Orionis Third 3.42 Algjebbah θ Orionis Third (Orion nebula) ι Orionis...
open cluster. It is found at the eastern end of the belt, south west of Alnitak and west of the Horsehead Nebula which it partially illuminates. The combined...
share a common motion through space, along with the stars of Orion's Belt: Alnitak (Zeta Orionis), Alnilam (Epsilon Orionis), and Mintaka (Delta Orionis)...
His friend pointed out the constellation of Orion, and mentioned that Alnitak, the most easterly of the stars making up Orion's belt, was offset slightly...
correspond to two stars at the base of Orion, Rigel and Saiph, and another, Alnitak at the tip of the "belt" of the imagined hunter, the vertices of a nearly...
Orion B cloud of the larger Orion Molecular Cloud Complex. The bright star Alnitak (ζ Ori), the easternmost star in the Belt of Orion, appears very close...
Ondřejov Observatory) - Ondrejov—BlueEye600 Telescope L37 Alnitak Observatory Cádiz Observatorio Alnitak, El Puerto de Santa María L38 Schafsweide Observatory...
near the star of Bellatrix. Orion OB1b - the three bright stars ζ Ori (Alnitak), ε Ori (Alnilam), and δ Ori (Mintaka) which make up the asterism known...
meaning Three Stars (asterism), refers to an asterism consisting of Saiph, Alnitak, Alnilam, Mintaka, Betelgeuse, Bellatrix and Rigel. Consequently, the Chinese...
Gamma Velorum Double star 1.71 Alpha Gruis Star 1.77 1.75 Alioth Star 1.77 Alnitak Triple star system 1.79 Alpha Persei Star 1.79 Dubhe Binary star system...