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Xi Orionis (ξ Orionis) is a binary star system in the northeastern part of the constellation of Orion, well above the red giant star Betelgeuse in the sky. It lies next to another blue main-sequence star, Nu Orionis, which is somewhat closer at 520 light-years' distance.
11 Orionis is a solitary [10] Ap star in the equatorial constellation of Orion, near the border with Taurus. It is visible to the naked eye with an apparent visual magnitude of 4.65, [ 7 ] and it is located approximately 365 light years away from the Sun based on parallax. [ 1 ]
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 ...
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.
The visible component is an evolved giant star of type K with a stellar classification of K0 III. [3] Its measured angular diameter is 2.19 ± 0.02 mas, [11] which, at its estimated distance yields a physical size of about 25 times the radius of the Sun. [7] It has 2.67 times the mass of the Sun and is about 650 million years old.
Pi 2 Orionis (π 2 Ori, π 2 Orionis) is the Bayer designation for a solitary star in the equatorial constellation of Orion. Although the Bright Star Catalogue lists this as a spectroscopic binary star system, [10] this does not appear to be the case. [11] It is visible to the naked eye with an apparent visual magnitude of 4.35. [2]
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]
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