Dwarf planet a draft resolution for the IAU definition of planet, both Pluto and Charon would have been considered dwarf planets in a binary system, given that they both satisfied the mass and shape requirements for dwarf planets and revolved around a common center of mass located between the two bodies (rather than within one of the bodies). The IAU currently states that Charon is not considered to be a dwarf planet and is just a satellite of Pluto, although the idea that Charon might qualify to be a dwarf planet in its own right may be considered at a later date.
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