Alpha Centauri

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Al·pha Cen·tau·ri

 (ăl′fə sĕn-tôr′ē)
A multiple star in Centaurus, 4.4 light years from Earth, whose three components form the brightest object in the constellation and the third brightest star in the night sky.

Al′pha Centau′ri

a triple-star system that is the brightest celestial object in the constellation Centaurus.
[< New Latin: Alpha of Centaurus]

Al·pha Cen·tau·ri

(ăl′fə sĕn-tôr′ē)
A multiple star consisting of three stars in the constellation Centaurus. It is the star nearest Earth, at a distance of 4.4 light-years, and it is the third brightest star in the night sky. ♦ Prox·i·ma Centauri (prŏk′sə-mə) is the individual star in this system that is closest to Earth, but it is very faint and far from the system's center of mass.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Alpha Centauri - brightest star in Centaurus; second nearest star to the sun
Centaurus, Centaur - a conspicuous constellation in the southern hemisphere near the Southern Cross
References in periodicals archive ?
On hearing from Johnson, he set about observing a Alpha Cen more intensively, using a transit telescope to measure Right Ascension and a mural circle to measure declination.
3 light-years for Alpha Cen AB), Barnard's Star (5.
Alpha Cen Bb's original detection, made by Xavier Dumusque (now at the Harvard-Smithsonian Center for Astrophysics) and colleagues, was a heroic effort to strip away all sources of "jitter.
The spectacular, zero-magnitude double star Alpha Cen AB, and its faint, red-dwarf tag-along Alpha Cen C (Proxima Centauri) 2[degrees] to one side, are so far south at about declination -61[degrees] that they're forever out of sight north of Miami or thereabouts.