Phoebe

Phoebe is one of the moons of Saturn. A small ice moon with an irregular orbit, it was thought to have originally come from the Kuiper belt and captured by Saturn's gravity.

The first manned landing on Phoebe was made by Martians in 2342, in order to be surveyed for ice mining (much like the rings of Saturn). When core samples from the moon were investigated, however, silicate samples were found, and the Martian government approached Protogen as a cosponsor of a long-term research facility.