Altair IV

From FreeSpace Wiki

Altair IV is one of an undisclosed number of sites which have harbored Ancient technology. Fleeing their homeworld as it was ravaged by the SD Lucifer, a group of Vasudan scientist/refugees had to make emergency landfall as their lifeboat lost power.

They found an Ancient data recorder which possessed key information relating to the Lucifer's Achilles heel and subsequent destruction.