Achernar...aka Alpha Eridani. That was where Redjac had one of its sprees, right? On the second planet in that system? Heliopolis City?
Different Achernar. That one was/is in Federation space. There's another Achernar in Romulan space, seen in Star Charts
(which is where I got it to use in Articles
as the seat of the Romulan State).