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Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune. Pluto has three natural satellites [1]


Plutoids are celestial bodies in orbit around the sun at a semi-axis greater than Neptune' s that has sufficient mass for their self-gravity to overcome rigid body forces so that they assume a hydrostatic equilibrium shape[2]

  1. The Sun, Planets and Dwarf Planets
  2. Dymock R Asteroids and Dwarf Planets and How to Observe Them ISBN 978-1-4419-6438-0