Alpha Centauri is that the nearest star system and nearest planetary system to the system at four.37 light-years (1.34 pc) from the Sun. it’s a triple star system, consisting of 3 stars: Alpha Centauri A (officially Rigil Kentaurus), Alpha Centauri B (officially Toliman), and Alpha Centauri C (officially Proxima Centauri Centauri).
Alpha Centauri A and B square measure Sun-like stars (Class G and K), and along they type the double star Alpha Centauri AB. To the optic, the 2 main elements seem to be one star with an obvious magnitude of −0.27, forming the brightest star within the southern constellation of constellation and therefore the third-brightest within the night sky, outshone solely by double star and supergiant.
Alpha Centauri A has one.1 times the mass and one.519 times the luminousness of the Sun, whereas Alpha Centauri B is smaller and cooler, at 0.907 times the Sun’s mass and zero.445 times its luminousness. The try orbit a couple of common centre with associate orbital amount of seventy nine.91 years. Their elliptical orbit is eccentric, in order that the gap between A and B varies from thirty five.6 astronomical units (AU), or regarding the gap between Pluto and therefore the Sun, thereto between Saturn and therefore the Sun (11.2 AU).
Alpha Centauri C, or flare star, could be a tiny and faint red dwarf star (Class M). tho’ not visible to the optic, flare star is that the nearest star to the Sun at a distance of four.24 light-years (1.30 pc), slightly nearer than Alpha Centauri AB. Currently, the gap between flare star and Alpha Centauri AB is regarding thirteen,000 astronomical units (0.21 ly), corresponding to regarding 430 times the radius of Neptune’s orbit. flare star b is associate Earth-sized exoplanet within the livable zone of Proxima Centauri Centauri; it absolutely was discovered in 2016.
Alpha Centauri could be a triple star system, with its 2 main stars, binary A and binary B, being a binary part. The AB designation, or older A×B, denotes the mass centre of a main positional notation relative to companion star(s) during a star system. AB-C refers to the part of Proxima in relevancy the central binary, being the space between the centre of mass and also the far companion. as a result of the space between Proxima Centauri (C) and either of binary A or B is comparable, the AB positional notation is usually treated as one attraction object.