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It is the middle and brightest of the three stars of Orion's Belt. Alnilam is a B-type blue supergiant; despite being nearly twice as far from the Sun as the other two belt stars, its luminosity makes it nearly equal in magnitude. Alnilam is losing mass quickly, a consequence of its size. It is the farthest major star in Orion at 1,344 light years.
Rigel is an intrinsic variable star with an apparent magnitude ranging from 0.05 to 0.18. [ 5] It is typically the seventh-brightest star in the celestial sphere, excluding the Sun, although occasionally fainter than Betelgeuse. [ 32] Rigel appears slightly blue-white and has a B-V color index of −0.06. [ 33]
Orion's Belt is an asterism in the constellation of Orion. Other names include the Belt of Orion, the Three Kings, and the Three Sisters. [ 1] The belt consists of three bright and easily identifiable collinear star systems – Alnitak, Alnilam, and Mintaka – nearly equally spaced in a line, spanning an angular size of ~ 140 ′ (2.3°).
List of stars in Orion. This is the list of notable stars in the constellation Orion, sorted by decreasing brightness. Name. B. F. Var. HD. HIP. RA.
The Trapezium is a relatively young cluster that has formed directly out of the parent nebula. The five brightest stars are on the order of 15 to 30 solar masses in size. They are within a diameter of 1.5 light-years of each other and are responsible for much of the illumination of the surrounding nebula. The Trapezium may be a sub-component of ...
Sigma Orionis or Sigma Ori (σ Orionis, σ Ori) is a multiple star system in the constellation Orion, consisting of the brightest members of a young 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 brightness of the component stars is ...
Database references. SIMBAD. data. Pi3 Orionis ( π3 Orionis, abbreviated Pi3 Ori, π3 Ori ), also named Tabit / ˈteɪbɪt /, [ 11][ 12] is a star in the equatorial constellation of Orion. At an apparent visual magnitude of 3.16, [ 2] it is readily visible to the naked eye and is the brightest star in the lion's hide (or shield) that Orion is ...
Pulsations of S Orionis, showing dust production and masers (ESO) S Orionis is a Mira variable that pulsates with an approximately 420‑day cycle, and varies in radius from 2.0 to 2.3 astronomical units. The pulsations have been observed using VLTI and VLBA observations which measured an angular diameter varying between 7.9 and 9.7 mas.