Achernar Prime (Romulan language: Atlai'fehill Stelai) was a planet located in the space of the galaxy's Beta Quadrant, in orbit of the Achernar star system. In the late 24th century, Achernar Prime became the capital planet of the Imperial Romulan State.
Until December of 2379, it was a planet in the Romulan Star Empire and amongst the Star Empire's chief farming worlds; a fleet loyal to Donatra took control of the planet that year, and from there Donatra declared the Imperial Romulan State's existence. (ST novel: Articles of the Federation)
- The alternative spelling/name Archenar Prime comes from The Path to 2409.
Achernar Prime was home to a type of pterosaur. By the 2380s, the species had nearly been hunted to extinction, although small numbers of them still existed far from Romulan habitation. (ST - Typhon Pact novel: Rough Beasts of Empire)