Achernar (α Eri, α Eridani, Alpha Eridani), sometimes spelled Achenar, is the brightest star in the constellation Eridanus and the tenth-brightest star in the night sky. Of the ten apparent brightest stars in the nighttime sky, Achernar is the hottest and bluest in color.[nb 1] Lying at the southern tip of Eridandus, the star has an unusually rapid rotational velocity, causing it to become oblate in appearance. Achernar is actually a binary star system, with the second star known as Achernar B. The second star is smaller and orbits Achernar A at a distance of 6.7 astronomical units (AU). Both stars are A-type stars.
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