New Kaon

Situated on the far galactic rim away from Autobot interference, the Decepticon refugee colony of New Kaon is ideal for coordinating the scattered cells of Decepticons left in the wake of Megatron's disappearance. It serves as the capital world of the Decepticon Empire, albeit a very unimpressive one.

New Kaon was originally known as Pyrovar.

Animated cartoon
''After Megatron disappeared and was presumed dead, Blitzwing held a funeral session for his leader at New Kaon. Blitzwing later hired the bounty hunter Lockdown there.''

''A fight between Blitzwing and Lugnut started at the central base of operations on New Kaon and quickly turned ugly. After they realized that their conflict was being exacerbated for profit by the ever-enterprising Decepticon merchant Swindle, they returned to New Kaon to extract their revenge.''

Ask Vector Prime
In Primax 092.0 Beta, Predator leader Skyquake was sent running back to New Kaon after Autobot leader Hyperdrive and Rotorstorm defeated him.