Pluto
GW canon
Sector / Segmentum
Segmentum Solar
Description
Dwarf planet in the Kuiper belt at the edge of the Sol System, home to the system's main surveillance stations. In the Battle of Pluto the Alpha Legion struck the fortress moon Hydra; the Imperial Fists had converted Charon, Kerberos, Nix, Styx and Hydra into fortresses.
Additional Information
Celestial body
Dwarf planet
Source
Warhammer 40,000 Wiki (Fandom), “Battle of Pluto”; Warhammer Community, “The Horus Heresy: Siege of Terra”