Achernar Island (66°58′S57°12′E), also known as Utöy, is an island 2.4 kilometres (1.5 mi) long, lying 1.6 kilometres (1 mi) west of Shaula Island in the Øygarden Group. Mapped by Norwegian cartographers from aerial photos taken by the Lars Christensen Expedition, 1936–37, and named Utoy (the outer island).