List of former planets

|rowspan=2| {{sort|Aspect|Aspects of Venus}}

|rowspan=2| "Phosphorus", the Morning Star of Greek antiquity (Eosphorus, the Dawn-Bringer; called "Lucifer" by the Romans), and "Hesperus", the Evening Star (called "Vesper" by the Romans), were later identified as a single planet, Venus (Aphrodite).

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{{cite journal |title= Hesperus and Phosphorus |journal= The Philosophical Review |author= Leonard Linsky |volume= 68 |number= 4 |date= October 1959 |pages= 515–518 |doi= 10.2307/2182495 |jstor= 2182495 }}

{{cite episode |url= http://www.jackstargazer.com/scripts_feb2009.html |title= The Great Cosmic Light Called Hesperus, Brother Of Lucifer, Reaches Greatest Brilliancy |series= Star Gazer |number= 09-07 (1628) |date= February 2009 }}

| rowspan=4| {{sort|Moon|Moons of Jupiter}}

| rowspan=4|Originally presented as satellite planets orbiting the planet Jupiter. Planetary status later rescinded, leaving them only as satellites. Ganymede is the largest satellite in the Solar System, and is slightly larger than Mercury, but is about half as massive.

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{{cite journal |title= Sidereus Nuncius |author= Galileo Galilei |year= 1610 |language=la}}

{{cite web |url= http://galileo.rice.edu/sci/observations/jupiter_satellites.html |title= Satellites of Jupiter |date= 1995 |author= Al Van Helden |work= The Galileo Project |publisher= Rice University }}

{{cite web |url= http://solarviews.com/eng/galdisc.htm |title= The Discovery of the Galilean Satellites |publisher= Views of the Solar System |author= Calvin J. Hamilton |date= 2009 }}

{{cite journal |url= http://inference-review.com/article/the-provencal-humanists-and-copernicus |title= Montaigne, Peiresc, Gassendi, and Cassini - The Provençal Humanists and Copernicus |author= Jean-Pierre Luminet |volume= 2 |number= 4 |journal= Inference: International Review of Science |date= 31 December 2016 }}

| rowspan=5| {{sort|Moon|Moons of Saturn}}

| rowspan=5|Originally presented as satellite planets orbiting the planet Saturn. Planetary status later rescinded, leaving them only as satellites. Titan is the second largest satellite in the Solar System, and is slightly larger than Mercury, but less massive.

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{{cite journal |title= Découverte de deux nouvelles planètes autour de Saturne |author= Jean-Dominique Cassini (Giovanni Domenico Cassini) |year= 1673 |publisher= Paris Observatory |language=fr}}

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{{cite journal |doi= 10.1098/rstl.1686.0013 |author = Jean-Dominique Cassini (Giovanni Domenico Cassini) |year= 1686–1692 |title= An Extract of the Journal Des Scavans. Of April 22 st. N. 1686. Giving an Account of Two New Satellites of Saturn, Discovered Lately by Mr. Cassini at the Royal Observatory at Paris |journal= Philosophical Transactions of the Royal Society of London |volume= 16 |issue= 179–191 |pages= 79–85 |jstor= 101844 |bibcode = 1686RSPT...16...79C |doi-access= free }}

| rowspan=2| {{sort|Moon|Moons of Uranus}}

| rowspan=2|Originally presented as satellite planets orbiting the planet Uranus.{{cite journal| doi = 10.1098/rstl.1787.0016| last = Herschel | first = W. S.| author-link = William Herschel| title = An Account of the Discovery of Two Satellites Revolving Round the Georgian Planet| journal = Philosophical Transactions of the Royal Society of London| volume = 77| pages = 125–129| year = 1787| jstor = 106717| doi-access = free |quote=And the heavens now displayed the original of my drawing, by shewing, in the situation I had delineated them, The Georgian Planet attended by two satellites.

I confess that this scene appeared to me with additional beauty, as the little secondary planets seemed to give a dignity to the primary one, which raises it into a more conspicuous situation among the great bodies of our solar system.}} Planetary status later rescinded, leaving them only as satellites.

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The first asteroids to be discovered were accepted as planets in the Copernican system, since they directly orbited the Sun. By 1855 the number of known bodies in the asteroid belt had grown to 15, at which point astronomers started distinguishing these from the eight known major planets. The 1867 edition of Berliner Astronomisches Jahrbuch placed all the new bodies in the asteroid belt into a separate category as 'minor planets' or 'asteroids', by which point almost 100 asteroids had been observed.{{Cite web|url=http://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/minor-planets/|archive-url = https://web.archive.org/web/20120406222551/http://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/minor-planets/|archive-date = 2012-04-06|title = When did the asteroids become minor planets? – Naval Oceanography Portal}}

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{{cite web|url=http://aa.usno.navy.mil/faq/docs/minorplanets.php |title=When did the asteroids become minor planets? |author=James L. Hilton |date=18 April 2016 |work=Astronomical Applications Department |publisher=U.S. Naval Observatory |url-status=dead |archive-url=https://web.archive.org/web/20080324182332/http://aa.usno.navy.mil/faq/docs/minorplanets.php |archive-date=24 March 2008 }}

{{Cite book|url=https://books.google.com/books?id=AbZqDwAAQBAJ&q=mercury+venus+earth+mars+ceres+pallas+juno+vesta+astraea+hebe+iris&pg=PA130|title = How to Speak Science: Gravity, Relativity, and Other Ideas That Were Crazy Until Proven Brilliant|isbn = 9781615194032|last1 = Benamran|first1 = Bruce|date = 2018| publisher=The Experiment }}

|rowspan=6| Asteroid

|rowspan=2|Trans-Neptunian object

|rowspan=2|When discovered, these bodies were briefly hailed as the tenth and eleventh planets by the press, but it was then decided that 15760 Albion was the prototype of trans-Neptunian objects or cubewanos.