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The Trapezium or Orion Trapezium Cluster, also known by its Bayer designation of Theta 1 Orionis (θ 1 Orionis), is a tight open cluster of stars in the heart of the Orion Nebula, in the constellation of Orion. It was discovered by Galileo Galilei. On 4 February 1617 he sketched three of the stars (A, C and D), but missed the surrounding ...
The Trapezium cluster has many newborn stars, including several brown dwarfs, all of which are at an approximate distance of 1,500 light-years. Named for the four bright stars that form a trapezoid, it is largely illuminated by the brightest stars
It is a B class blue main sequence star with several faint companions. θ 1 Orionis consists of multiple components, primarily the four stars of the Trapezium cluster (A, B, C, and D) all within one arc-minute of each other. θ 2 Orionis is a more distant grouping of three main stars plus several fainter companions, 1-2 arc-minutes from θ 1.
The Trapezium Cluster is a component of the much larger Orion Nebula cluster, an association of about 2,800 stars within a diameter of 20 light years. [10] The Orion Nebula is in turn surrounded by the much larger Orion molecular cloud complex , which is hundreds of light years across, spanning the whole Orion Constellation.
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°).
G0VCH-0.3: binary star HD 31253: 31253: 22826: 04 h 54 m 44 s ... component of the Trapezium; quintuple star system; Algol variable, V max = 7.9 m, V min = 8.65 m, P ...
Theta 1 Orionis consists of multiple components, primarily the four stars of the Trapezium cluster, all within one arc-minute of each other. Theta 2 Orionis is a more distant grouping of three main stars plus several fainter companions, 1-2 arc-minutes from Theta 1.
θ 1 Orionis, the well known Trapezium cluster, is only 2 arc minutes away from θ 2 Orionis A. Despite the names, θ 2 Orionis A is marginally brighter than the brightest star in the Trapezium. The Catalog of Components of Double and Multiple Stars includes the stars of θ 1 and θ 2 Ori within the same system of 13 components.