Alpha Eridani II was the inhabited second planet of its star system. This planet was aligned directly between Earth and Argelius II. In the 22nd century, an Earth colony was founded on the planet.

In 2156, the Redjac entity was responsible for ten women being knifed to death in the settlement of Heliopolis on Alpha Eridani II. (TOS: "Wolf in the Fold")

According to the Star Trek: Star Charts (p. 66) and the Stellar Cartography: The Starfleet Reference Library ("Position of the Romulan Empire"; "Federation Historical Highlights, 2161-2385"), the Alpha Eridani (Achernar) system was located in the Beta Quadrant. This was a binary system with two B-class stars. According to a map of the Romulan Empire – prepared by the Stellar Archive Artist Lsel Essik, from the Romulan Master Data Catalog, in 2366 – Alpha Eridani (Achernar) was identified as a Romulan system.
Star Trek Maps, Star Trek Concordance, an entry on, and Star Trek Encyclopedia (3rd ed., p. 8) referred to the planet mentioned in "Wolf in the Fold" as "Alpha Proxima II". The pronunciation of this planet in the episode sounded more like "Alpha Aradoni II", which was also supported by the closed captioning. The spelling of "Alpha Eridani II" can be found in the Redjac entry on and in the Star Trek Encyclopedia (3rd ed., p. 403) as well as the Star Trek: Star Charts. For the fourth edition of the "Star Trek Encyclopedia" (p. 20), the planet was correcly identified as "Alpha Eridani II". According to the Star Trek Maps (p. 22), Alpha Proxima II was one of the first extra-solar Human colonies, with major industries in mining, farming and sea-farming. By the 23rd century, the planet had a total population of 12 million with more than 3 million living in the port city Heliopolis.

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