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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 ...
This is an A-type main-sequence star with a stellar classification of A3 Va. [3] It is a Lambda Boötis star, [8] which means the spectrum shows lower-than-expected abundances for heavier elements. [9] Pi 1 Orionis is a relatively young star, just 100 million years old, [5] and is spinning fairly rapidly with a projected rotational velocity of ...
• Notes = Common name(s) or alternate name(s); comments; notable properties [for example: multiple star status, range of variability if it is a variable star, exoplanets, etc.] See also [ edit ]
The primary component is a B-type star with a stellar classification of B2 III. [3] The stellar spectrum of π 4 Ori A shows a strong depletion of the element boron. [12] It has nearly 11 [6] times the mass of the Sun and nine times the Sun's radius. [7] The star is 15.4 [10] million years old and has a projected rotational velocity of 38 km/s. [9]
23 Orionis is a double star located around 1,200 light-years (370 parsecs) [1] away from the Sun in the equatorial constellation of Orion. [12] It is visible to the naked eye as a dim, blue-white-hued point of light with a combined apparent visual magnitude of 4.99. [2]
Pi Orionis (π Ori, π Orionis) is a group of fairly widely scattered stars in the constellation Orion that constitute the asterism Orion's Shield or Orion's Bow. [1]They form an exception to the general rule that stars that share the same Bayer designation are close together: π 1 is nearly 9° north of π 6 (Tau Eridani is an even more noteworthy example of this).
The three stars of θ 2 Orionis within the Orion Nebula. θ 2 Orionis consists of three stars in a line, each about an arc-minute from the next. In addition to the well-known three stars, the Washington Double Star Catalog confusingly lists a component D which is actually θ 1 Orionis C. [16] There is one other star brighter than 10th magnitude ...
Pi 3 Orionis (π 3 Orionis, abbreviated Pi 3 Ori, π 3 Ori), also named Tabit / ˈ t eɪ b ɪ t /, [10] [11] 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 holding.