Damon (planet)

Damon is the ninth and farthest-known planet from the Sun. In the Solar System, it is the fifth-largest planet, the fourth-most-massive planet and the densest giant planet same as Neptune. It is 2 times the mass of Earth (22,334 km), slightly more massive than it's near-twins Uranus and Neptune although, Neptune and Damon has the same density and both planets are denser and physically smaller than Uranus because it's greater mass causes more gravitational compression of its atmosphere. The planet orbits the Sun once every 365 years at an average distance of 50 AU (7.4 billion km; 4.6 billion mi). It is named after Pythias' friend, Damon. It has 12 moons.

Like it's near-twin Neptune, Damon is not visible to the unaided eye. It was considered to be the tenth planet for 39 years until Pluto was demoted to a Dwarf planet.