13434 Pluto
Pluto is the contraversial ninth plantet in the Solar System, however many astronomers think that it should be reclassified as a Minor Planet, Trans-Neptunian Object, or Icy Dwarf. It has three natural satelites: Charon is the largest, and two smaller ones, S/2005 P1 and S/2005 P2, have recently been discovered.
Pluto is not included in the standard Orbiter distribution, but an addon can be downloaded from Orbithangar.