(45) Eugenia I Petit-Prince is an asteroid moon that orbits the larger asteroid 45 Eugenia. It was discovered in 1998 by astronomers at the Canada-France-Hawaii Telescope on Mauna Kea, Hawaii. Initially, it received the provisional designation S/1998 (45) 1.
Petit-Prince was named in 2003 after Antoine de Saint-Exupéry's character The Little Prince, who lives on an asteroid called B612 and was in turn based on the Prince Imperial, son of Napoleon III of France and Empress Eugenia.
Petit-Prince is 13 km in diameter, compared to 45 Eugenia's 214 km. It takes five days to complete an orbit around Eugenia.
Petit-Prince was the first asteroidal moon to be discovered by a ground-based telescope. Previously, the only known moon of an asteroid was Dactyl, discovered by the Galileo space probe around 243 Ida.