Dwarf planet
From Tardis Wiki, the free Doctor Who reference
Dwarf planets were celestial bodies similar to actual planets, which were nevertheless not considered to fall under the definition of a planet.
Dwarf planets in the Sol system included Ceres, Eris and Pluto. (AUDIO: The Bounty of Ceres)
While Pluto was considered a planet in the 20th century, it was classified as a dwarf planet Steven Taylor's times. (AUDIO: The Anachronauts) However, some still called it a planet in later eras. (TV: The Sun Makers)
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