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Infrared images from instruments at Kitt Peak National Observatory (left) and NASA's Spitzer Space Telescope document the outburst of HOPS 383, a young protostar in the Orion star-formation complex. The background is a wide view of the region taken from a Spitzer four-color infrared mosaic.
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 star C is the most massive of the four bright stars at the heart of the cluster. It is an O class blue main sequence star with a B-type main sequence companion. Its high luminosity and large distance (about 1,500 light years ) give it an apparent visible magnitude of 5.1.
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).
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.
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 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 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]