Achernar is the brightest star in the constellation of Eridanus and the ninth-brightest in the night sky. It has the Bayer designation Alpha Eridani, which is Latinized from α Eridani and abbreviated Alpha Eri or α Eri. The name Achernar applies to the primary component of a binary system. The two components are designated Alpha Eridani A (the primary) and B (the secondary), with the latter known informally as Achernar B. As determined by the Hipparcos astrometry satellite, this system is located at a distance of approximately from the Sun.
Achernar is the ninth-brightest star visible in Earth's night sky and the brightest star in the constellation Eridanus, formally designated as Alpha Eridani. It is actually a binary system with two components, with the primary star being the one commonly referred to as Achernar.
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