neptune's orbit is 164 years so observations (1950 to present day) span less than a third of a neptunian year.
neptune's orbit is 164 years so observations (1950 to present day) span less than a third of a neptunian year.
pluto:32
pluto has yet to complete a full orbit of the sun since its discovery, as one plutonian year is 247.68 years long.