Omicron Persei I
The planet Omicron Persei I is a Class N world in the Omicron Persei System. It has no atmosphere although it is orbitted by a class H moon Kadyl which possesses an atmosphere consisting of 60% Helium, 25% Methane and 15% Oxygen. As such is is considered uninhabitable.
While there are no remains of an ancient civilization on the pleant there, certainly were on the Kadyl. The world is believed to the the origins for the Soldarin species. Among the moons artifacts are the Soldarin Archives, the Soldarin Monolith and the Soldarin Memory Extraction Machine.
The ruins were discovered by the crew of the USS Rosenante in 2414 when they followed the Soldarin Archive Probe into the system.
Omicron Persei I was first seen in the USS Rosenante Mission Lest We Forget