Orion’s Belt is an asterism consisting of three bright stars in a straight line located in the Orion constellation. It is part of the larger hourglass-shaped asterism that makes Orion one of the easiest constellations to find in the night sky.
The three stars that form the Belt of Orion are Alnitak (Zeta Orionis), Alnilam (Epsilon Orionis) and Mintaka (Delta Orionis).
Alnitak is a triple star 736 light years from Earth that has a blue supergiant star as the primary component. The supergiant is the brightest star belonging to the spectral class O in the sky.
Alnilam is also a blue supergiant and the 30th brightest star in the sky. It lies in the middle of Orion’s Belt. It lies approximately 1,300 light years from Earth.
Mintaka is the right-most star in the asterism. It is in fact a multiple star system. The primary component is a binary star composed of a B-class giant and an O-class star. The stars are approximately 900 light years distant from the Sun.