Jondum

Jondum was a gas giant in the. It was the fourth planet from the star and was the system's largest planet.

History
After the were assimilated into the  around in 2492, Jondum became host to a number of orbital refineries intended to convert the planet's gases into fuel. Nearly a century later when the Covenant, several Jiralhanae chieftains and their packs battled one another for ownership of these refineries. As a result of the fighting, only a scarce few survived and remained operational as of 2560.

When the launched an attack on the system in 2561, they used Jondum as an early rallying point as it's radiation hid their slipspace signatures from the Brutes' sensors. Months later, the Swords of Sanghelios would use the refineries over Jondum to fuel the ships that enforced their blockade of.