Theta 1 Orionis C (θ 1 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 main sequence star with a B-type main sequence companion.

Theta 1 Orionis C is the brightest and most massive of the Trapezium stars. It has an apparent magnitude of 5.13. It is a blue main sequence star of the spectral type O6 Vp. It has a mass about 33 times that of the Sun and a radius 10.6 times solar.

Theta1 Orionis C is a spectroscopic binary star located in the constellation of Orion, The Hunter. It is not part of the Orion constellation outline but is within the borders of the constellation.

The Trapezium or Orion Trapezium Cluster, also known by its Bayer designation of Theta1 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.

Apr 2, 2009 · Zooming in the center of the Orion star-forming region with the four bright Trapezium stars (Theta 1 Ori A-D). The dominant star is Theta 1 Ori C, which was imaged with unprecedented...

Dec 31, 2004 · THETA-1 ORI (Theta-1 Orionis). Dropping nearly straight down from Orion 's brilliant three-star Belt (from right to left Mintaka , Alnilam , and Alnitak , or Delta, Epsilon, and Zeta Orionis) is the Hunter's three-star "Sword," in the middle of which is one of the great sights of the telescopic sky, the Orion Nebula .

θ1 Orionis is a variable and multiple hypergiant star of spectral class B0 in the constellation of Orion. θ1 Orionis visual magnitude is 6.7. Because of its faintness, θ1 Orionis is not visible to the naked eye.

The Trapezium, Theta 1 Orionis (θ1 Ori), is the most famous multiple star system in the entire night sky. Located at the very heart of M42, the Orion Nebula, it is one of the youngest star clusters known.

Feb 2, 2009 · The nearby high-mass star binary system Theta 1 Orionis C is the brightest and most massive of the Trapezium OB stars at the core of the Orion Nebula Cluster, and it represents a perfect laboratory to determine the fundamental parameters of young hot stars and to constrain the distance of the Orion Trapezium Cluster.

The Bayer designation θ Orionis (Theta Orionis) is shared by several astronomical objects, located near RA 05h 35m DEC −05° 24′: The various components are spread over several arc-minutes in and near the Orion Nebula.