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List of Solar System bodies formerly regarded as planets

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The table below lists Solar System bodies formerly considered to be planets:

Bodies	Notes
Sun, Moon	Believed in antiquity to be what would now be described as planets.
Io, Europa, Ganymede, and Callisto	The four largest moons of Jupiter, known as the Galilean moons after their discoverer Galileo Galilei. He referred to them as the "Medicean Planets" in honor of his patron, the Medici family.
Titan^[1], Iapetus^[2], Rhea^[2], Tethys^[3], and Dione^[3]	Five of Saturn's larger moons, discovered by Christiaan Huygens and Jean-Dominique Cassini.
Ceres^[4], Pallas, Juno, and Vesta	The first known asteroids. Several other asteroids were also included, until their reclassification during the 1850s.^[5] Ceres has subsequently been reclassified from asteroid to dwarf planet.
Pluto^[6]	Kuiper belt object beyond the orbit of Neptune. In 2006, Pluto was reclassified as a dwarf planet.

As large Kuiper belt and scattered disc objects were discovered in the late 1990's and early years of the twenty-first century, a number including Quaoar, Sedna and Eris were heralded in the popular press as the 'tenth planet', however none of these received widespread scientific recognition as such, although Eris has now been classified as a Dwarf Planet.

Footnotes

^ Referred to by Huygens as a Planetes novus ("new planet") in his Systema Saturnium
^ ^a ^b Both labelled nouvelles planètes (new planets) by Cassini in his Découverte de deux nouvelles planetes autour de Saturne
^ ^a ^b Both once referred to as "planets" by Cassini in his An Extract of the Journal Des Scavans.... The term "satellite", however, had already begun to be used to distinguish such bodies from those around which they orbited ("primary planets").
^ Recently reclassified as a dwarf planet in 2006.
^ http://spaceweather.com/swpod2006/13sep06/Pollock1.jpg
^ Regarded as a planet from its discovery in 1930 until redesignated as a trans-Neptunian dwarf planet in August 2006.