Antares


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Antares

(ăntâr`ēz), brightest star in the constellation ScorpiusScorpius
or Scorpio
[Lat.,=the scorpion], conspicuous southern constellation lying on the ecliptic (the sun's apparent path through the heavens) between Sagittarius and Libra; it is one of the constellations of the zodiac.
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; Bayer designation Alpha Scorpii; 1992 position R.A. 16h27.6m, Dec. −26°22'. A red supergiant of spectral classspectral class,
in astronomy, a classification of the stars by their spectrum and luminosity. In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
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 M1, Antares has an apparent magnitudemagnitude,
in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. A.D.), all visible with the unaided eye, were ranked on a brightness scale such that the brightest stars were of 1st magnitude and the dimmest stars
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 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.

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.

Antares

[an′tar·ēz]
(astronomy)
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.
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Antares is about 12 times more massive than the sun and has a diameter about 700 times bigger, because of how much red supergiant stars expand as they age.
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The head of the Scorpion is marked by a roughly north-south line of three stars to the right (west) of Antares: Beta ([beta]), Delta ([delta]), and Pi ([pi]) Scorpii.
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