Gehenna is a rogue planet; a sub brown dwarf made of predominately hydrogen and helium. It has a large satellite called Hinnom that orbits at 25.2 AU and is formed of rock and ice. Far Fenwick has created a modest base, Moulinsart, on the moon to refuel starships.
Gehenna is very difficult to find if you do not have pre-planned jump co-ordinates.
