Scorpius

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Scorpius

(skôr`pēəs) or

Scorpio

(–pēō) [Lat.,=the scorpion], conspicuous southern constellationconstellation,
in common usage, group of stars that appear to form a configuration in the sky; properly speaking, a constellation is a definite region of the sky in which the configuration of stars is contained.
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 lying on the eclipticecliptic
, the great circle on the celestial sphere that lies in the plane of the earth's orbit (called the plane of the ecliptic). Because of the earth's yearly revolution around the sun, the sun appears to move in an annual journey through the heavens with the ecliptic as its
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 (the sun's apparent path through the heavens) between Sagittarius and Libra; it is one of the constellations of the zodiaczodiac
[Gr. zoion=animal], in astronomy, zone of the sky that includes about 8° on either side of the ecliptic. The apparent paths of the sun, the moon, and the major planets all fall within this zone.
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. Scorpius contains the bright stars AntaresAntares
, 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.
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 (Alpha Scorpii) and ShaulaShaula,
bright star in the constellation Scorpius; Bayer designation Lambda Scorpii; 1992 position R.A. 17h33.7m, Dec. −37°06'. A bluish-white star of spectral class B1 V, its apparent magnitude of 1.
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 (Lambda Scorpii); a recurrent nova that flared up in 1863, 1906, and 1936; and Scorpius XR-1, the strongest X-ray source in the sky. The constellation reaches its highest point in the evening sky in July.

Scorpius

(skor -pee-ŭs) (Scorpion) A conspicuous zodiac constellation in the southern hemisphere, lying partly in the Milky Way. The brightest stars are Antares (α) and the blue subgiant Shaula (λ), both 1st magnitude, and several of 2nd and 3rd magnitude. The area contains many star clusters, including the bright naked-eye open clusters M6 (NGC 6405) and M7 (NGC 6475), the globular clusters M4 (NGC 6121) and M80 (NGC 6093), and the X-ray source Scorpius X-1. Abbrev.: Sco; genitive form: Scorpii; approx. position: RA 17h, dec –30°; area: 497 sq deg.

Scorpius

[′skȯr·pē·əs]
(astronomy)
A southern constellation, right ascension 16 hours, declination 40° south; the bright-red star Antares is located in it. Also known as Scorpion.