- For other uses, see Achernar.
Sometime in the 22nd century, the planet was colonized by Earth. In 2156, the entity known as Redjac murdered several females in this planet's city Heliopolis. Around the same time the colony was evacuated due to the threat of Romulan invasion. Gannet Brooks reported on the evacuation. (TOS episode: "Wolf in the Fold"; ENT novel: Beneath the Raptor's Wing)
- Given that 24th century sources cite Achernar II as a Romulan planet, it seems likely that the world was captured by the Empire during the Earth-Romulan War.
Until December of 2379, it was a planet in the Romulan Star Empire. That month, the planet fell under the control of the newly-formed Imperial Romulan State, whose capital was the Achernar Prime in the same star system. (ST novel: Articles of the Federation)