Theta1 Orionis A
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Theta1 Orionis A is a trinary star in the constellation Orion. The system consists of an close pair of eclipsing stars orbited by a visual companion farther away. Its apparent magnitude range is 6.72
Trapezium stars
Theta1 Orionis C
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Theta1 Orionis C is a member of the Trapezium open cluster that lies within the Orion Nebula. The star C is the most massive of the four bright stars at the heart of the cluster. It is an O class blue
Theta1 Orionis A
…away. Its apparent magnitude range is 6.72 to 7.65 with a period of 65.432 days. It is one of the main stars in The Trapezium in Orion, along with B, C, and D, as well as the fainter E. θ1 Orionis A varies in brightness, showing dips from magnitude 6.72 to 7.65 every 65.432 days. These are caused by…
θ1 Orionis C is seen as a double star (right inset) with VLTI near-infrared interferometry