Protus-4

Protus-4
Protus-4 is a 1/2 billion year old star system consisting of all stable-orbited protoplanets. They are all located beyond 20 AU, and there are no planets, except for a few asteroids, they stray there. It is believed that a up to 3 large gas giants resided there, until very recently a disruption by a passing star system destroyed the gas giants, which were keeping the protoplanets in check. This is evidenced by a faint ring of hydrogen, lithium, helium, and methane orbiting the star between roughly 2 AU-18.5 AU.

Star-
The Star, Protus 4A, is a large F-type star.

(Proto)Planets-

 * Quadprotus b- The largest of all the planets, it is Mars-Sized.