The three stars are part of as asterism known as Three Stars (參宿), formed by the Belt stars and other bright Orion stars: Betelgeuse, Rigel, Bellatrix and Saiph. Alnitak, the Flame Nebula and the Horsehead Nebula, image: Wikisky. The primary star, Alnitak Aa is the brightest star of class O in the night sky. Alnitak is a very interesting star, because it is not one, but three stars. Its stellar winds may reach up to 2000 km/s, causing it to lose mass about 20 million times more rapidly than the Sun.[11]. 3.31 – 3.6). The stars of Orion’s Belt have had many different names across different cultures. [6] Analysis of the spectra and age of the members of the Orion OB1 association yields a mass 34.6 times that of the Sun (40.8 M☉ on the main sequence) and an age of 5.7 million years. [10] Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. In Chinese, 參宿 (Shēn Sù), meaning Three Stars (asterism), refers to an asterism consisting of Alnilam, Alnitak, and Mintaka (Orion's Belt), with Betelgeuse, Bellatrix, Saiph, and Rigel later added. Alnitak is the 5th brightest star in Orion and the 31st brightest star in the sky. The nearby Flame Nebula (NGC 2024) is illuminated by the star’s strong ultraviolet light. The luminosity of 832,000 L☉ at 606 parsecs is the highest ever derived for this star. [17], The three belt stars were collectively known by many names in many cultures. The image above shows the uncropped view of Alnilam (North is up) through the Takahashi E-180 Astrograph. [18] Consequently, the Chinese name for Alnilam is 參宿二 (Shēn Sù èr, English: the Second Star of Three Stars). Alnilam est le nom propre de l'étoile qui a été approuvé par l'Union astronomique internationale le 20 juillet 2016[1]. It is estimated to be 275,000 to 832,000 times as luminous as the Sun, and 30–64.5 times as massive. Localisation dans la constellation : Orion, Alnilam, Alnihan, Alnitam, ε Ori, 46 Ori (Flamsteed), HR 1903, HD 37128, SAO 132346, BD-01 969, FK5 210, HIP 26311. Elle est l'étoile du milieu, dans la ceinture d'Orion. Alnitak A is a close binary star, consisting of components Alnitak Aa and Alnitak Ab.


It is the eastern star of Orion’s Belt, appearing to the left of Alnilam and Mintaka to northern observers. It has a mass of 40 solar masses and a diameter 26 times the Sun.

Acamar Achernar Acrux Adhara Albireo Alcor Alcyone Aldebaran Alderamin Algenib Algol Alhena Alioth Alkaid Almach Alnair Alnilam Alnitak Alpha Centauri Alphard Alphecca Alpheratz Altair Aludra Ankaa Anser Antares Arcturus Ascella Asterope Atlas Atria Avior Baten Kaitos Bellatrix Betelgeuse Bharani Canopus Capella Caph Castor Celaeno Deneb Denebola Diphda Dubhe Electra Elnath Eltanin Enif Fomalhaut Gacrux Gamma Cassiopeiae Ginan Hadar Hamal Imai Izar Kaus Australis Kaus Borealis Kaus Media Maia Marfik Markab Megrez Meissa Menkalinan Menkar Menkent Merak Merope Mesarthim Miaplacidus Mimosa Mintaka Mira Mirach Mirfak Mirzam Mizar Mu Cephei Naos Nunki Peacock Phecda Pleione Polaris Pollux Procyon Proxima Centauri Rasalhague Regulus Rho Ophiuchi Rigel Rigil Kentaurus Ruchbah Sabik Sadr Saiph Sargas Scheat Schedar Segin Seginus Shaula Sheratan Sirius Spica Stephenson 2-18 Suhail Taygeta Thuban Toliman Unukalhai UY Scuti Vega VV Cephei VX Sagittarii Wezen WOH G64 Zeta Reticuli Zubenelgenubi Zubeneschamali, 1,260 ± 180 light years (387 ± 54 parsecs), Alnitak, Zeta Orionis, ζ Ori, 50 Orionis, 126 G. Orionis, HIP 26727, SAO 132444, TD1 5127, BD−02°1338, WDS J05407-0157, ADS 4263 AB, IRAS 05381-0158, GSC 04771-01188, 2MASS J05404553-0156336. 2.00), Saiph (Kappa Ori, mag. Epsilon Orionis (ε Ori / ε Orionis) (ou Alnilam) est une grande étoile de la constellation d'Orion. Zeta Orionis is a multiple star system with at least three components. Arabic terms include Al Nijād 'the Belt', Al Nasak 'the Line', Al Alkāt 'the Golden Grains or Nuts', and, in modern Arabic, Al Mīzān al H•akk 'the Accurate Scale Beam'. Crowther and colleagues, using stellar wind and atmospheric modelling in 2006, came up with a luminosity 275,000 times that of the Sun (L☉), and effective temperature of 27,000 K and a radius 24 times that of the Sun (R☉). German amateur astronomer George K. Hunowsky reported Alnitak to be a double star in 1819. Silhouetted against IC 434 is the famous dark Horsehead Nebula, which lies just south of Alnitak. It is now so entered in the IAU Catalog of Star Names. [11] Searle and colleagues, using CMFGEN code to analyse the spectrum in 2008, calculated a luminosity of 537,000 L☉, an effective temperature of 27,500 ± 100 K and a radius of 32.4 ± 0.75 R☉. The two stars are only slightly fainter than Miaplacidus in Carina constellation, Alnilam in Orion and Alnair in Grus, and they just outshine Mirfak in Perseus, Dubhe in Ursa Major and Regor in Vela. 1.59 to 1.64), Alnilam (Epsilon Ori, mag. Alnilam /ælˈnaɪlæm/,[9] designation ε Orionis, (Latinized to Epsilon Orionis, abbreviated Epsilon Ori, ε Ori) and 46 Orionis (46 Ori), is a large blue supergiant star some 2,000 light-years distant in the constellation of Orion. However, the blue supergiant was only recently found to have another companion. Alnitak B is a class B giant star with a visual magnitude of 4.01. 1.64 – 1.74), Alnitak A (Zeta Ori A, mag. Alnitak is a triple star system at the eastern end of Orion's belt, the second magnitude primary having a 4th magnitude companion nearly 3 arc-seconds distant, in an orbit taking over 1,500 years.. Alnitak is the easternmost star of Orion’s Belt, one of the best known asterisms in the night sky, also formed by the bright Alnilam and Mintaka. In spite of being a relatively young star at 6.4 million years of age, Alnitak Aa has already stopped fusing hydrogen in its core.

It lies only 11 astronomical units from the primary star, which makes the pair a very close binary system. Alnitak Aa, the primary star in the Zeta Orionis system, is a hot blue supergiant with the stellar classification O9.5 Iab. Alnilam est également l'une des 57 étoiles utilisées en navigation astronomique.

Étant une étoile supergéante de couleur bleue-blanche, elle est l'une des étoiles les plus lumineuses connues. Alnilam / æ l ˈ n aɪ l æ m /, designation ε Orionis, (Latinized to Epsilon Orionis, abbreviated Epsilon Ori, ε Ori) and 46 Orionis (46 Ori), is a large blue supergiant star some 2,000 light-years distant in the constellation of Orion.It is estimated to be 275,000 to 832,000 times as luminous as the Sun, and 30–64.5 times as massive. Orion’s Belt is best seen in mid-December, when it is at its highest in the sky, and in January at 9 pm. It was discovered by a team from the Lowell Observatory in Flagstaff, Arizona.

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