Charon’s diameter is 1,172 kilometers (728 miles), just over half the size of Pluto. It has 1/7th the mass of Pluto. It has a surface area of 4,400,000 km2.
Due to the unusually small difference in size between it and Pluto, Pluto and Charon are sometimes considered to be a double planet. They are also sometimes thought of as not a planet and a satellite, but as the first two Trans-Neptunian objects.
See also: Greek Mythology