other beings associated with the Underworld from mythology, folklore and literature. Names for the Underworld and for Underworld locales from mythology, folklore and literature. Heroes and other explorers of the Underworld. Scientists and engineers associated with Pluto and the Kuiper Belt. Pioneering space missions and spacecraft. Historic pioneers who crossed new horizons in the exploration of the Earth, sea and sky. Charon Destinations and milestones of fictional space and other exploration. Fictional and mythological vessels of space and other exploration. Fictional and mythological voyagers, travellers and explorers. Authors and artists associated with space exploration, especially Pluto and the Kuiper Belt. Nix Deities of the night. Hydra Legendary serpents and dragons. Kerberos Dogs from literature, mythology, and history. Styx River gods. Asteroids 1 Ceres 4 Vesta 243 Ida (243) Ida I Dactyl 951 Gaspra 253 Mathilde 433 Eros 25143 Itokawa See also Astronomical naming conventions Lists of geological features of the Solar System List of adjectivals and demonyms of astronomical bodies Naming of moons Selenography Toponymy, the scientific study of place-names (toponyms), their origins, meanings, use and typology. Notes References Citations Sources . Further reading External links Gazetteer of Planetary Nomenclature IAU Working Group for Planetary System Nomenclature (WGPSN) 'Planetary Names: How do we come up with them?', Planetary Society weblog article by Rosaly Lopes, IAU WGPSN member Members of the WGPSN Planetary Maps: Visualization and Nomenclature Cartographica 41/2 2006 Development of a Local Toponym System at the Mars Desert Research Station Cartographica 42/2 2007 APTN National News interviews Planetary Cartographer John Koulouris,(Esq.) on I.A.U. officially adopted Planetary Surface Feature Nomenclature attributed to Aboriginal Peoples' Cultures, People and Places Planetary Atlas of Venus in the Hellenic (Greek) and English Languages with I.A.U. adopted surface feature nomenclature as of 1984 created by: John A. Koulouris,(Esq.) Nomenclature Encodings Astronomical nomenclature Planetary geology