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Antares (ăntârˈēz), brightest star in the constellation Scorpius; Bayer designation Alpha Scorpii; 1992 position R.A. 16h27.6m, Dec. −26°22′. A red supergiant of spectral class M1, Antares has an apparent magnitude of about 0.9, making it one of the 20 brightest stars in the sky. Its name is from the Greek meaning “rival of Mars,” referring both to its color and to its brightness. Antares is a binary star and a semiregular variable, with magnitude ranging from 0.86 to 1.02. Its distance from the earth is about 520 light-years.
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Antares(an-tair -eez) (α Sco) A huge remote but conspicuous red supergiant that is the brightest star in the constellation Scorpius. It is in an advanced stage of evolution. It is a visual binary (separation 3″, period 900 years), its 5th-magnitude B-type companion appearing green by contrast. The companion orbits inside the cool stellar wind and is a peculiar hot radio source. mv : 0.96 (var.); Mv : –5.2; spectral type: M1.5 Iab; diameter: about 285 times solar diameter; distance: 160 pc.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
A red supergiant variable binary star of stellar magnitude 0.9, 520 light-years from the sun, spectral classification M1-Ib, in the constellation Scorpius; the star α Scorpii.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.