Achernar Island also known as Utöy, is an island

Island

An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, cays or keys. An island in a river or lake may be called an eyot , or holm...

 1.5 miles (2 km) long, lying 1 miles (2 km) west of Shaula Island

Shaula Island

Shaula Island is an island long and rising to lying east of Achernar Island in the Oygarden Group. Mapped by Norwegian cartographers from aerial photos taken by the Lars Christensen Expedition, 1936–37, and called "Soroya"...

 in the Øygarden Group

Øygarden Group

Øygarden Group is a group of rocky, irregular islands which extends about 11 mi in an east-west direction, lying in the southern part of the entrance to Edward VIII Bay. First sighted in February 1936 by Discovery Investigations personnel on the RSS William Scoresby, and considered by them to be...

. Mapped by Norwegian cartographers from aerial photos taken by the Lars Christensen Expedition, 1936–37, and named Utoy (the outer island). The group was first visited by an ANARE (Australian National Antarctic Research Expeditions

Australian National Antarctic Research Expeditions

The Australian National Antarctic Research Expeditions is the historical name for the Australian Antarctic Program administered for Australia by the Australian Antarctic Division .-The ANARE Name:...

) party in 1954; the island was renamed by ANCA after the star Achernar

Achernar

Achernar , sometimes spelled Achenar, is the brightest star in the constellation Eridanus and the ninth-brightest star in the night sky. Of the top ten apparent brightest stars —Sirius, Canopus, Alpha Centauri, Arcturus, Vega, Capella, Rigel, Procyon, Achernar and Betelgeuse—Achernar is the hottest...

, which was used for an astrofix in the vicinity.