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Betelgeuse, also known by its bayer designation alpha orionis (α orionis, α ori), is the eighth-brightest star in the night sky and second-brightest in the constellation of orion. distinctly reddish, it is a semiregular variable star whose apparent magnitude varies between 0.2 and 1.2, the widest range of any first-magnitude star. betelgeuse is one of three stars that make up the winter triangle, and it marks the center of the winter hexagon.