Which dwarf planet is orbited by the moon Charon?

The dwarf planet orbited by the moon Charon is Pluto.

Charon is Pluto’s largest moon and the biggest of its five known natural satellites. Astronomer James Christy discovered it on June 22, 1978, after noticing a recurring bulge in photographic images of Pluto. The discovery showed that earlier estimates of Pluto’s size and mass had mistakenly attributed the entire system’s light and mass to Pluto alone.

Charon is unusually large compared with its parent: its diameter is about half Pluto’s, and its mass is roughly 12% of Pluto’s. The pair orbit a shared center of mass, or barycenter, located outside Pluto. Both bodies are tidally locked, meaning each always keeps the same hemisphere facing the other.

Charon is sometimes described informally as part of a binary dwarf-planet system, but the International Astronomical Union formally classifies it as a satellite of Pluto. Pluto’s other moons are Styx, Nix, Kerberos, and Hydra. NASA’s New Horizons spacecraft made the first close flyby of the system in July 2015.