Pluto (134340 Pluto) is a Dwarf Planet in an eccentric orbit ranging roughly from 30 AU (Neptune's distance) to 50 AU. It has a steeper Orbital Inclination than the eight planets: 17° from the Ecliptic. It and Neptune share an Orbital Resonance, with a ratio of 3:2.
Pluto was discovered in 1930 and was considered the ninth planet until the discovery of similar objects. Five satellites are known:
The New Horizons mission observed Pluto during a 2015 flyby.
Equilibrium Temperature (Teq)
International Astronomical Union (IAU)
Kuiper Airborne Observatory (KAO)
Kuiper Belt (K Belt)
Late Heavy Bombardment (LHB)
New Horizons (NF1)
Trans-Neptunian Object (TNO)