(ninth-brightest star in the sky)
Achernar (Alpha Eridani) is the ninth-brightest star in the sky,
a bright blue variable star in the southern sky.
It is rotating rapidly with
a rotation period of hours and is highly flattened.
It has a companion orbiting at about 12 AU.
(star,bright star,binary star,variable star)
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Referenced by pages:
B-type star (B)