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Achernar

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description Achernar Overview

Achernar, designated Alpha Eridani, is the brightest star in the constellation Eridanus and the ninth-brightest star in the night sky. Classified as a hot, blue main-sequence B-type star, it is located in the southern celestial hemisphere. Due to its exceptionally rapid rotation, Achernar is significantly oblate, making it the least spherical known star in the Milky Way. Its velocity causes the star's equatorial radius to be substantially larger than its polar radius.

help Achernar FAQ

Why is Achernar shaped differently from most stars?

Achernar is the brightest star in the constellation Eridanus, but it is famous for being one of the least spherical stars known to astronomers. It spins at an incredibly rapid velocity, which causes it to bulge significantly at its equator and flatten at its poles.

Can you see Achernar from the Northern Hemisphere?

Because of its far southern celestial position, Achernar cannot be seen from most of the Northern Hemisphere. It is primarily visible to observers in the Southern Hemisphere, including regions like South Africa and Australia.

What type of star is Achernar?

Achernar is classified as a massive, hot blue main-sequence star, specifically a B-type star. It is significantly larger and hotter than our own Sun.

Where does Achernar get its name?

The name Achernar is derived from the Arabic phrase "Al Ahir al Nahr," which translates to "the end of the river." This name perfectly reflects its position at the very southern tip of the Eridanus constellation.

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