Alpha Centauri

system of three stars that comprises the brightest part of the constellation Centaurus

See Alpha Centauri (disambiguation) for other uses. Alpha Centauri (α Cen / α Centauri, also known as Rigil Kentaurus), is the brightest star system in the southern constellation of Centaurus. Although it appears as a single point to the naked eye, Alpha Centauri is actually a system of three stars, one of which is the fourth brightest star in the night sky. Alpha Centauri is famous in the Southern Hemisphere as the outermost "pointer" to the Southern Cross, but it is too far south to be visible in most of the northern hemisphere. The two brightest components of the system are too close to be resolved as separate stars by the naked eye and so are perceived as a single source of light with a total visual magnitude of about −0.27 (brighter than the third brightest star in the night sky,  Arcturus).
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Noun
1. brightest star in Centaurus; second nearest star to the sun
(synonym) Rigil Kent, Rigil
(hypernym) binary star, binary, double star
(member-holonym) Centaurus, Centaur, The Centaur

A triple star system which has the distinction of being the closest star system to the Sun. It exists at a distance of 4.3 light years. The two other components are Beta Centauri and Proxima Centauri, which is slightly closer than the other two. Alpha Centauri can be seen in the southern sky in the constellation of Crux as a bright star of apparent magnitude -0.1. In reality, it is a star very similar to the Sun, since both have spectral classifications of G2 and both are on the main sequence.

ALFA CENTAURI