Betelgeuse

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Betelgeuse

Betelgeuse (bētˈəljo͞ozˌ), bright star in the constellation Orion; Bayer designation α Orionis; 1992 position R.A. 5h54.8m, 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.
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Betelgeuse

(bee -t'l-jooz) (α Ori) A remote luminous red supergiant that is the second-brightest star in the constellation Orion. It is a semiregular variable with a period of about 5.8 years; the normal magnitude range is 0.3 to 0.9 but the magnitude has reached 0.15 and been as low as 1.3. It is a strong source of infrared radiation. IRAS found that the long-wavelength infrared is emitted from three concentric shells, the largest with a radius of 1.5 parsecs, ejected within the past 100 000 years. Images of the surface of Betelgeuse have been produced by various interferometry techniques, and indicate a nonuniform brightness. Mv : –5.7; spectral type: M2 Iab; diameter: about 500 times solar diameter; distance: 150 pc.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Betelgeuse

[′bed·əl‚jüs]
(astronomy)
An orange-red giant star of stellar magnitude 0.1-1.2, 650 light-years from the sun, spectral classification M2-Iab, in the constellation Orion; the star α Orionis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.