Titan


 * You may have meant the asteroid Titan III.

Titan was a moon of Saturn, the seventh planet of the Sol system. Its (Galifreyan-style) coordinates were "quadrant 62 WHI 12 12 9990 EX 41." It had a methane atmosphere.

Titan was the homeworld of notorious criminal Dirk Slipstream. (PROSE: Night of the Humans)

In the late 21st century, its bleak landscape reminded the Second Doctor's companion Jamie McCrimmon of the Land of Fiction. (PROSE: The Wheel of Ice)

A small base existed on the surface of Titan. In the year 5000, the Swarm infected the base and attempted to turn it into its Hive, but the Fourth Doctor destroyed it by igniting the fuel tanks. (TV: The Invisible Enemy)