The tenth planet of the Argus star system. A Class M world, it is now host to many mining colonies extracting ores to make the hulls of the next generation of Federation starships.

In the recent past this world was home to a Dikronium Cloud Creature. In 2268 the Federation starship U.S.S. Enterprise NCC-1701 chased it back to Tycho IV, where her crew managed to destroy it with an antimatter bomb.