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 C and companions in the Trapezium cluster
θ1 Orionis C is seen as a double star (right inset) with VLTI near-infrared interferometry
O-type main-sequence star
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An O-type main-sequence star is a main-sequence—core hydrogen-burning—star of spectral type O. The spectral luminosity class is V, although class O main sequence stars often have spectral peculiaritie
Theta1 Orionis C
…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. Its high luminosity and large distance (about 1,500 light years) give it an apparent visible magnitude of 5.1…
Sigma Orionis is a rare example of a quintuple star system. The largest star in the system, σ Ori A, is an O-type main-sequence star.