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Omicron 1 Orionis (ο 1 Ori) is a binary star [9] in the northeastern corner of the constellation Orion. It is visible to the naked eye with an apparent visual magnitude of 4.7. [4] Based upon an annual parallax shift of 5.01 ± 0.71 mas, it is located approximately 650 light years from the Sun.
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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]
V380 Orionis is a multiple star system containing at least three stars. A very faint cool star 9" away is also thought to be gravitationally bound, making it a hierarchical quadruple system. Two infrared sources within NGC 1999 have been listed as companions in some catalogues, [ 7 ] but are not thought to be stars. [ 8 ]
θ 1 Orionis A is a star system with three known members. Components A1 and A2 are separated by around 0.2 " , while A1 is itself a spectroscopic binary with two stars separated by about 1 au . θ 1 Orionis A1 is an eclipsing binary but the secondary is not detected in the spectrum and is far less luminous than the primary.
Pi 1 Orionis (π 1 Ori, π 1 Orionis) is a star in the equatorial constellation of Orion.It is faintly visible to the naked eye with an apparent visual magnitude of 4.74. [2] Based upon an annual parallax shift of 28.04 mas, [1] it is located about 116 light-years from the Sun.
42 Orionis is a class B1V [3] (blue main-sequence) star in the constellation Orion. Its apparent magnitude is 4.59 [2] and it is approximately 900 light years away based on parallax. [1] The primary star, Aa, has one spectroscopic companion Ab of magnitude 6.3 and separation 0.16", and a more distant companion B of 7.5 magnitude at 1.6 ...
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 ...