Many factions used large asteroids as bases including smugglers and pirates, due to their easyness to defend and remote locations.
Star Wars Battlefront: Renegade Squadron[]
An Asteroid Base
In Star Wars Battlefront: Renegade Squadron asteroid bases are a new addition to space battles. They have a fairly simple layout and are used as a command post which spawns the new advanced fighter class, the B-wing for the Rebel Alliance and the TIE Defender for the Galactic Empire.
Star Wars: Empire at War[]
An asteroid base is commonly surronded by smaller asteroids.
In Star Wars: Empire at War the pirate faction uses asteroids as a space station, the asteroids are often removed when the pirate forces lose control of the system.