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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]
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 ...
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 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 two closest stars, Aa and Ab, are separated by only about a tenth of an astronomical unit and orbit in just under eight days. [6] The system lies within the Orion OB1 association, a group of massive stars that includes most of the bright stars of Orion. [10] It is assigned to the oldest and closest part of the association, known as OB1a. [11]
This is a spectroscopic binary star system with an orbital period of 45.1 days and an eccentricity of 0.26. [5] The primary component is a B-type subgiant star with a stellar classification of B3 IV. [3] With an estimated age of just 32 million years, [3] it has a relatively high rate of spin, showing a projected rotational velocity of 160 km/s ...
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• 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 ]