α Centauri A and B are Sun-like stars (class G and K, respectively) that together form the binary star system α Centauri AB. To the naked eye, these two main components appear to be a single star with an apparent magnitude of −0.27.

2025年1月17日 · Alpha Centauri, triple star system that contains Proxima Centauri, the closest star to the Sun, about 4.2 light-years distant. The system is the third brightest star in the sky. The nearest extrasolar planets are the three planets that orbit Proxima Centauri.

南門二 （英語： Alpha Centauri，即 半人馬座α，简写为 α Cen）是位於南天的 半人馬座 中的一個 三合星 系统，由两颗 類太陽恆星 南门二甲（半人馬座α星A）、南门二乙（半人馬座α星B）和一颗红矮星 比邻星 （半人馬座α星C）组成。 其中，南门二甲和乙是一个双星系统，肉眼無法分辨彼此；暗弱的比邻星则在較远距离围绕两者公转，肉眼不可见。 南门二的綜合 視星等 為-0.27等， 絕對星等 4.4等，习惯上视为夜空第三亮星。 南門二距離 太陽 4.37 光年 （約277,600 天文單 …

2016年9月2日 · The closest star system to the Earth is the famous Alpha Centauri group. Located in the constellation of Centaurus (The Centaur), at a distance of 4.3 light-years, this system is made up of the binary formed by the stars Alpha Centauri A and Alpha Centauri B, plus the faint red dwarf Alpha Centauri C, also known as Proxima Centauri.

Alpha Centauri is a binary star system of two stars A & B. The distance between them is quite close. To the naked eye, the stars are too close for the eye to be able to see them as separate. Their orbit is about the distance of the giant planets from our Sun. There is a third star, Proxima Centauri (or Alpha Centauri C).

2023年6月13日 · At 4.3 light-years away, Alpha Centauri A and B are the nearest Sun-like stars to our solar system. They orbit with Proxima Centauri as a triple star system. Alpha Centauri A is a Class G star that is 1.1 times the mass of the Sun. Alpha Centauri B is slightly cooler Class K star that is 0.9 times the mass of the Sun. Proxima Centauri, the ...

Bearing the “alpha designation,” Alpha Centauri is the brightest star in the southern constellation of Centaurus. It shines with an apparent magnitude of -0.27. The Alpha Centauri star system is the third brightest star in our night sky. The only brighter stars are Sirius and Canopus.

2016年4月13日 · The star Alpha Centauri is one of the brightest stars in the southern sky (marked with a red circle). It lies just 4.3 light-years from the Earth and one component in a triple star system. Image...

2019年12月6日 · Alpha Centauri is a triple star system. It is the closest star and planetary system to our Solar System. Alpha Centauri was discovered in 1915, while it’s only confirmed planet, Proxima Centauri b, was discovered in 2016 and it is the closest exoplanet to us.

2021年11月5日 · The planet, called Alpha Centauri Bb, is too close to its star to be habitable, but it is the closest alien world yet found. Even the closest star is more than 266,000 times farther away than our...