The Gacerian system, a system under the control of the Imperial forces, resided within the Expansion Region and it consisted of these planets:
- 1 Tun: devoid of any moons
- 2 Wei: possesses no moons
- 3 Alc: has a single moon.
- 4 Gacerian: features two moons
- 5 Tytun: is orbited by eight moons
- 6 Rue: without any moons