Most myths about Orion’s death involve a scorpion, but the stories differ from one mythographer to another. The chemically peculiar magnetic He-Strong star sigma Orionis E is also one of the most luminous nonthermal stellar radio sources in the sky at centimeter wavelengths. The Earth Goddess heard him and sent a scorpion, which stung the giant to death. The brightest and most massive star in the cluster, component C, is Theta-1 Orionis C, a blue main sequence star belonging to the spectral class O6pe V. The star has a visual magnitude of 5.13 and is approximately 1,500 light years distant. A 150mm (6-inch) size scope at high powers and good seeing conditions will split the pair into magnitude +5.8 and +6.5 components. Their separation varies from less than half an astronomical unit to around two AU. Phi-1 Orionis is a double star approximately 1,000 light years distant. It is the brightest O class star known. The Flame Nebula is illuminated by the light of the hot blue supergiant Alnitak, the easternmost star in Orion’s Belt. Rigel – β Orionis (Beta Orionis, 19 Orionis). In the order of brightness, the apparent magnitudes of the components are 2.23 (3.2/3.3), 6.85, 14.0. In Australia, the stars forming Orion’s Belt and sword are sometimes called the Pot or the Saucepan. The constellation Orion has its origins in Sumerian mythology, specifically in the myth of Gilgamesh. Alnilam will soon evolve into a red supergiant, one much brighter than Betelgeuse, and eventually explode as a supernova. The dust accumulates into a denser region that is heated and forms the visible infrared shape. It is helium-rich, has a strong magnetic field, and varies between magnitudes 6.61 and 6.77 during a 1.19 day period of rotation. Chi-1 Orionis is a main sequence dwarf, only 28 light years distant from Earth. It is lit by the B star HD 37903, the most luminous star lighting the surface of the molecular cloud Lynds 1630 (Horsehead Nebula, or Barnard 33), and one of the largest reflection nebulae in the sky. The image was taken from the Digital Sky Survey and has a size … The brightest star in the constellation is Rigel, Beta Orionis, with an apparent magnitude of 0.18. The Chinese knew the constellation as Shen, a great hunter or warrior. The name Alnitak is derived from the Arabic word an-nitaq, meaning “the girdle.”. It has a visual magnitude of 2.0 and is between 900 and 1,500 light years distant. It is about 5 magnitudes fainter than the helium-rich primary, about magnitude 10-11 at K band infrared wavelengths. The estimated ages of the components Aa, Ab, and B, are respectively 0.3+1.0−0.3 Myr, 0.9+1.5−0.9 Myr, and 1.9+1.6−1.9 Myr. The bright red arc at lower right is a bow shock, where material in front of the speeding multiple-star system Sigma Orionis is piling up (see Sigma Orionis star cluster). [32] An infrared and radio source, IRS1, 3.3" from σ Ori A that was considered to be a patch of nebulosity has been resolved into two subsolar stars. The primary component in the Sigma Orionis system is a double star, Sigma Orionis AB, composed of two hydrogen-fusing dwarfs separated by only 0.25 arc seconds. 2007). The brightest component in the system, Alnitak A, is yet another hot, blue supergiant, one with an absolute magnitude of -5.25. The brighter object has an M1 spectral class, a mass around a half M☉, and appears to be a relatively normal low mass star. It is 47 arc seconds in size and has an apparent magnitude of 4.0. Barnard’s Loop is approximately 150 light years in radius and it covers much of the Orion constellation. Acknowledgment: Cambridge Astronomical Survey Unit. It is sometimes called The 37 Cluster because it resembles the number 37. They called Orion URU AN-NA, meaning “the light of heaven.” Their name for the constellation Taurus was GUD AN-NA, or “the bull of heaven.”. The star is approximately 720 light years distant. It lies on the celestial equator. It belongs to the Orion Arm, which is a minor spiral arm of the Milky Way, sometimes also known as the Orion Spur or the Orion-Cygnus Arm. It is the closest bright star to the celestial equator: it rises and sets almost exactly east and west. The star has a visual magnitude of 2.04 and belongs to the spectral class O9. Alnilam, Epsilon Orionis, is a hot, bright blue supergiant. In Scandinavian tradition, the constellation is associated with the goddess Freya and called Frigg’s Distaff (Friggerock), after the tool she used for spinning. Betelgeuse is one of the most luminous stars known. It is losing mass and its internal hydrogen fusion is shutting down. 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