Betelgeuse bēt´əljo͞oz˝ [key], bright star in the constellation Orion Bayer designation α Orionis 1992 position R.A. 5 h54.8 m, Dec. +7°24′. A red supergiant with a luminosity about 13,000 times that of the sun, it is of spectral class M2 Iab. Betelgeuse is a semiregular variable star with apparent magnitude ranging from 0.06 to 0.75 thus, at maximum brightness it is one of the 10 brightest stars in the sky. Betelgeuse marks the right shoulder of Orion its distance is about 500 light-years.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

See more Encyclopedia articles on: Astronomy: Stars

Browse By Subject