Charon (moon) Charon (moon) Charon, also known as (134340) Pluto I, is the largest of the five known natural satellites of the dwarf planet Pluto. It has a mean radius of 606 km. It was discovered in 1978 at the United States Naval Observatory in Washington, D.C., using photographic plates taken at the United States Naval Observatory Flagstaff Station (NOFS). With half the diameter and one eighth the mass of Pluto, Charon is a very large moon in comparison to its parent body. Its gravitational influence is such that the barycenter of the Plutonian system lies outside Pluto. The reddish-brown cap of
Sailor Pluto is still considered a member of the Sailor Guardians despite the reclassification of Pluto as a dwarf planet (as opposed to just a planet). Many fans joke that Sailor Moon will reinstate Pluto as a planet after becoming queen. Others joke she was "fired" from the Sailor Guardians. This despite the fact that the moon isn't a planet either yet this doesn't affect Sailor Moon's status and power. There are also Sailor Guardians of asteroids, classified as "minor planets". What astronomical bodies are called clearly has no bearing on the story. Due to her portrayal in the anime and a