for the next 100000 years is represented with the red arrow. The red dot in the diagram below shows where Alnilam is situated in It is only slightly fainter than Elnath in Taurus constellation and Miaplacidus in Carina, and it just outshines Alnair in Grus, its Orion neighbour Alnitak, and Alioth, the brightest star in Ursa Major. Orion is known for its exceptionally bright stars – mainly the first-magnitude supergiants Rigel and Betelgeuse – and several bright deep sky objects. Alnilam, also designated as ε Orionis (epsilon Orionis), 1.64 – 1.74), Alnitak A (Zeta Ori A, mag. 0.001 arcsec per year in Right Ascension and -0.002 arcsec per year in Declination and the associated displacement Navigational stars are selected both because they are very bright and because they are easy to identify. 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, Alnilam, Epsilon Orionis, ε Ori, 46 Orionis, 112 G Orionis, HIP 26311, HD 37128, SAO 132346, HR 1903, FK5 210, BD -01 969, TD1 4963, CCDM J05363-0112A, GC 6960, IRAS 05336-0113, 2MASS J05361280-0112070, TYC 4766-2450-1. Alnilam visual magnitude is 1.7, making it the 28th brightest star in the sky. Even though Alnilam appears closer to the stars to its right and left, Alnitak and Mintaka are in fact closer together because they lie at similar distances to Earth (Alnitak at 1,260 light years and Mintaka at 1,200 light years). Alnilam (epsilon Orionis) is een heldere ster in het sterrenbeeld Orion.. De ster staat ook bekend als Alnihan en Alnitam.Alnilam is de middelste ster van het opvallende rijtje van drie sterren die de gordel van Orion vormen. Alnilam is a supergiant star of the spectral type B0 Ia, appearing bluish or blue-white in colour. 2.00), Saiph (Kappa Ori, mag. Alnilam Facts. It changes in brightness from magnitude 1.64 to 1.74. The best time of year to observe Orion’s Belt is in mid-December, when it reaches its highest point in the sky. For southern observers, Orion is best seen during the summer months, appearing upside down. 0.0 – 1.3), Bellatrix (Gamma Ori, mag. In 2006, a team of scientists used atmospheric modelling and found that the star had a radius of 24 solar radii, a luminosity 275,000 times that of the Sun and a temperature of 27,000 K. Two years later, a different team analysed Alnilam’s spectrum and calculated a radius of 32.4 times that of the Sun, a luminosity of 537,000 solar luminosities and a temperature of 27,500 K. A recent survey of the star across several wavelengths, assuming the distance of 2,000 light years, gave a luminosity of 832,000 L☉, the highest to date for the star. The proper motion of Alnilam is The alignment of the three pyramids of Giza is believed by some to represent the Belt of Orion, but the Orion correlation theory has been heavily contested. Alnilam is distant in the constellation of It forms Orion's Belt with Alnitak and Mintaka. 2.77), Tabit (Pi3 Ori, mag. The red arrow shows the motion of Alnilam during the next. Latitude: 51° 28’ 47” N Celestial coordinates for the J2000 equinox as well as galactic coordinates of Alnilam are provided in the following table: The simplified sky map below shows the position of Alnilam in the sky: Location: Greenwich, United Kingdom [change] Other prominent features include lines of doubly ionized nitrogen, oxygen, and carbon and of triply ionized silicon, all of… The Chinese also call them Three Stars (參宿), in reference to an asterism originally formed by the three Belt stars. Other prominent features include lines of doubly ionized nitrogen, oxygen, and carbon and of triply ionized silicon, all of…. In very hot O-type stars, lines of ionized helium appear. Alnilam is the brightest of the three despite being the most distant. Other bright stars of Orion – Betelgeuse, Rigel, Bellatrix and Saiph – were added to the asterism later. Alnitak and Mintaka are both multiple star systems. 3.16), and Eta Orionis (mag. The star is classified as an Alpha Cygni-type variable. 2.23), Hatysa (Iota Ori, mag. Ancient Egyptians associated Orion and Sirius with Osiris and Isis, and believed that gods came from Orion’s Belt and Sirius to start the human race. Alnilam is located in the constellation Orion, one of the most recognizable constellations in the sky. The 10 brightest stars in Orion are Rigel (Beta Ori, mag. The name Alnilam (pronunciation: /ˈælnɪlæm/) was officially approved by the International Astronomical Union’s (IAU) Working Group on Star Names (WGSN) on July 20, 2016. https://www.britannica.com/topic/Epsilon-Orionis. Orion is a prominent feature of the night sky from November to May in the northern hemisphere and can also be seen in the early morning hours from late July to November. Alnilam is one of the four Orion stars used in celestial navigation, along with Rigel, Betelgeuse and Bellatrix, the stars that outline Orion’s hourglass shape together with Saiph, the constellation’s sixth brightest star. Alnilam’s Chinese name is the Second of Three Stars (參宿二). 2.09), Mintaka AB (Delta Ori AB, mag. 1,341.56 light years from the Sun and it is Alnilam (Epsilon Orionis) is the central and brightest of the three stars in Orion's Belt and the fourth brightest star in the whole of Orion.Alnilam is a blue-white supergiant that for many years has served as a standard star against which to compare others. Alnilam lies between Alnitak on the left and Mintaka on the right. Its relatively simple spectrum also provides a useful background against which to study the gases of the intervening interstellar medium. In Puerto Rico and the Philippines, they are associated with the Biblical Magi and called “Los Tres Reyes Magos.”. summarizes the key facts about Alnilam: Alnilam is …hot B-type stars, such as Epsilon Orionis, are characterized by lines of helium and of singly ionized oxygen, nitrogen, and neon.
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