IIRC, Hyperion was either an Imperial world or a planet administrated by House Devon. At least it was close to Devonians. It seemed to be the default starting world of SM2 adventures, housing all sorts of freelancers, low-lifes, and Emerich Rach (?) who was an influential broker (and later turned into a member of LoM).
My one and only attempt to use Rach as a NPC ended in a horrible misunderstanding when a player character attempted to blast him into ashes. It was a cloak-and-dagger scenario which had a little too much cloak and too little dagger for that player.
House Devon campaign module (made for SM1) might have more details (can't remember), and Hyperion was probably mentioned in every other module.