Class-9 gas giant

From Memory Alpha, the free Star Trek reference

In planetary classification, a Class-9 gas giant planet is the Human designation for a gas giant, which is recognized as a Q'tahL-class gas giant among Klingons.

The Klingon Raptor Somraw became disabled in a Class-9 gas giant following an attack by a Xarantine vessel in 2151. (ENT: "Sleeping Dogs")