Metis

Metis is an asteroid in the Sol Asteroid Belt. Hebe is the site of the Metis Imperial Library Center of the Imperium Stellaris.
First discovered in 1848 AD, Metis is an S-type asteroid. When establishing an imperial library center in the Sol Asteroid Belt, Metis was chosen since it has no significant resources of any other value.
Metis has been mined out and domed over in the centuries since its establishment and is famed throughout the Imperium Stellaris as a sort of modern-day Library of Alexandria.