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Timeline of discovery of Solar System planets and their moons

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Timeline of natural satellites in the Solar system by decade of discovery

For comparison, discovery dates of Uranus and Neptune are also included, as well as the first six asteroids. After the first six, new asteroids were discovered every year; however, the first four at least were for several decades considered full-fledged planets.

Prehistoric
Moon
Mercury
Venus
Mars
Jupiter
Saturn
1610s
January 7, 1610 Ganymede Jupiter III Galileo
January 7, 1610 Callisto Jupiter IV Galileo
January 8, 1610 Io Jupiter I Galileo
January 8, 1610 Europa Jupiter II Galileo
1650s
March 25, 1655 Titan Saturn VI Huygens
1670s
October 25, 1671 Iapetus Saturn VIII Cassini
December 23, 1672 Rhea Saturn V Cassini
1680s
March 21, 1684 Tethys Saturn III Cassini
March 21, 1684 Dione Saturn IV Cassini
1780s
March 13, 1781 Uranus
January 11, 1787 Titania Uranus III Herschel
January 11, 1787 Oberon Uranus IV Herschel
July 18, 1789 Mimas Saturn I Herschel
August 28, 1789 Enceladus Saturn II Herschel
1800s
January 1, 1801 1 Ceres
March 28, 1802 2 Pallas
September 1, 1804 3 Juno
March 29, 1807 4 Vesta
1840s
December 8, 1845 5 Astraea
September 23, 1846 Neptune
October 10, 1846 Triton Neptune I Lassell
July 1, 1847 6 Hebe
September 16, 1848 Hyperion Saturn VII Bond, Bond, Lassell
1850s
October 24, 1851 Ariel Uranus I Lassell
October 24, 1851 Umbriel Uranus II Lassell
1870s
August 12, 1877 Deimos Hall
August 18, 1877 Phobos Hall


1890s
September 9, 1892 Amalthea Jupiter V Barnard
August 16, 1898 Phoebe Saturn IX Pickering
1900s
December 4, 1904 Himalia Jupiter VI Perrine
January 3, 1905 Elara Jupiter VII Perrine
January 27, 1908 Pasiphaë Jupiter VIII Melotte
1910s
July 21, 1914 Sinope Jupiter IX Nicholson
1930s
July 6, 1938 Lysithea Jupiter X Nicholson
July 30, 1938 Carme Jupiter XI Nicholson
1940s
February 16, 1948 Miranda Uranus V Kuiper
May 1, 1949 Nereid Neptune II Kuiper
1950s
September 28, 1951 Ananke Jupiter XII Nicholson
1960s
1966 Janus* Saturn X Dollfus (Dollfus may have seen either Janus or Epimetheus)
1966 Epimetheus* Saturn XI
1970s
September 11, 1974 Leda Jupiter XIII Kowal
September 30, 1975 Themisto* S/1975 J 1 Jupiter XVIII Kowal (Discovered and then lost)
April 13, 1978 Charon 1978 P 1 Christy
March 4, 1979 Metis 1979 J 3 Jupiter XVI Synnott, Voyager 2
March 5, 1979 Thebe 1979 J 2 Jupiter XIV Synnott, Voyager 1
July, 1979 Adrastea 1979 J 1 Jupiter XV Jewitt
1980s
January 19, 1980 Janus* 1980 S 1 Saturn X (Confirmed by Voyager 1)
January 26, 1980 Epimetheus* 1980 S 3 Saturn XI (Confirmed by Voyager 1)
March 1, 1980 Helene 1980 S 6 Saturn XII Laques, Lecacheux
March 13, 1980 Calypso 1980 S 25 Saturn XIV Pascu, Seidelmann, Baum, Currie
April 8, 1980 Telesto 1980 S 13 Saturn XIII Smith, Reitsema, Larson, Fountain, Voyager 1
October, 1980 Atlas 1980 S 28 Saturn XV Terrile, Voyager 1
October, 1980 Prometheus 1980 S 27 Saturn XVI Collins, Voyager 1
October, 1980 Pandora 1980 S 26 Saturn XVII Collins, Voyager 1
December 30, 1985 Puck 1985 U 1 Uranus XV Synnott, Voyager 2
January 3, 1986 Juliet 1986 U 2 Uranus XI Synnott, Voyager 2
January 3, 1986 Portia 1986 U 1 Uranus XII Synnott, Voyager 2
January 9, 1986 Cressida 1986 U 3 Uranus IX Synnott, Voyager 2
January 13, 1986 Desdemona 1986 U 6 Uranux X Synnott, Voyager 2
January 13, 1986 Rosalind 1986 U 4 Uranus XIII Synnott, Voyager 2
January 13, 1986 Belinda 1986 U 5 Uranus XIV Synnott, Voyager 2
January 20, 1986 Cordelia 1986 U 7 Uranus VI Terrile, Voyager 2
January 20, 1986 Ophelia 1986 U 8 Uranus VII Terrile, Voyager 2
January 23, 1986 Bianca 1986 U 9 Uranus VIII Voyager 2
June, 1989 Proteus 1989 N 1 Neptune VIII Synnott, Voyager 2 [1]
July, 1989 Despina 1989 N 3 Neptune V Synnott, Voyager 2 [2]
July, 1989 Galatea 1989 N 4 Neptune VI Synnott, Voyager 2 [3]
July, 1989 Larissa 1989 N 2 Neptune VII Reitsema, Hubbard, Lebofsky, Tholen, Voyager 2 [4]
August, 1989 Naiad 1989 N 6 Neptune III Terrile, Voyager 2 [5]
August, 1989 Thalassa 1989 N 5 Neptune IV Terrile, Voyager 2 [6]
1990s
1990 Pan* 1981 S 13 Saturn XVIII Showalter, Voyager 2

(From Voyager 2 images taken August, 1981)

September 6, 1997 Caliban 1997 U 1 Uranus XVI Gladman, Nicholson, Burns, Kavelaars [7]
September 6, 1997 Sycorax 1997 U 2 Uranus XVII Gladman, Nicholson, Burns, Kavelaars [8]
May 18, 1999 S/1986 U10* Karkoschka, Voyager 2 [9]

(From Voyager 2 images taken January, 1986)

July 18, 1999 Prospero 1999 U 3 Uranus XVIII Holman, Kavelaars, Gladman, Petit, Scholl [10]
July 18, 1999 Setebos 1999 U 1 Uranus XIX Kavelaars, Gladman, Holman, Petit, Scholl [11]
July 18, 1999 Stephano 1999 U 2 Uranus XX Gladman, Holman, Kavelaars, Petit, Scholl [12]
October 19, 1999 Callirrhoe S/1999 J 1 Jupiter XVII Scotti, Spahr, McMillan, Larsen, Montani, Gleason, Gehrels [13]
2000
August 7, 2000 Ymir S/2000 S 1 Saturn XIX Gladman [14] [15]
August 7, 2000 Paaliaq S/2000 S 2 Saturn XX Gladman [16] [17]
August 7, 2000 Kiviuq S/2000 S 5 Saturn XXIV Gladman [18] [19]
September 23, 2000 Tarvos S/2000 S 4 Saturn XXI Kavelaars, Gladman [20] [21]
September 23, 2000 Ijiraq S/2000 S 6 Saturn XXII Kavelaars, Gladman [22] [23]
September 23, 2000 Suttungr S/2000 S 12 Saturn XXIII Gladman, Kavelaars [24] [25]
September 23, 2000 Mundilfari S/2000 S 9 Saturn XXV Gladman, Kavelaars [26] [27]
September 23, 2000 Skathi S/2000 S 8 Saturn XXVII Kavelaars, Gladman [28] [29]
September 23, 2000 Erriapo S/2000 S 10 Saturn XXVIII Kavelaars, Gladman [30] [31]
September 23, 2000 Siarnaq S/2000 S 3 Saturn XXIX Gladman, Kavelaars [32] [33]
September 23, 2000 Thrymr S/2000 S 7 Saturn XXX Gladman, Kavelaars [34] [35]
November 9, 2000 Albiorix S/2000 S 11 Saturn XXVI Holman, Spahr [36] [37]
November 21, 2000 Themisto* S/2000 J 1 Jupiter XVIII Sheppard, Jewitt, Fernandez, Magnier (Rediscovered) [38] [39]
November 23, 2000 Harpalyke S/2000 J 5 Jupiter XXII Sheppard, Jewitt, Fernandez, Magnier [40] [41]
November 23, 2000 Kalyke S/2000 J 2 Jupiter XXIII Sheppard, Jewitt, Fernandez, Magnier [42] [43]
November 23, 2000 Iocaste S/2000 J 3 Jupiter XXIV Sheppard, Jewitt, Fernandez, Magnier [44] [45]
November 23, 2000 Erinome S/2000 J 4 Jupiter XXV Sheppard, Jewitt, Fernandez, Magnier [46] [47]
November 23, 2000 Isonoe S/2000 J 6 Jupiter XXVI Sheppard, Jewitt, Fernandez, Magnier [48] [49]
November 23, 2000 Praxidike S/2000 J 7 Jupiter XXVII Sheppard, Jewitt, Fernandez, Magnier [50] [51]
November 25, 2000 Megaclite S/2000 J 8 Jupiter XIX Sheppard, Jewitt, Fernandez, Magnier [52] [53]
November 25, 2000 Taygete S/2000 J 9 Jupiter XX Sheppard, Jewitt, Fernandez, Magnier [54] [55]
November 25, 2000 Chaldene S/2000 J 10 Jupiter XXI Sheppard, Jewitt, Fernandez, Magnier [56] [57]
November, 2000 S/2000 J11 Sheppard, Jewitt, Fernandez, Magnier [58] [59]
2001
August 13, 2001 Trinculo S/2001 U 1 Uranus XXI Holman, Kavelaars, Milisavljevic [60] [61]
December 9, 2001 Hermippe S/2001 J 3 Jupiter XXX Sheppard, Jewitt, Kleyna [62] [63]
December 9, 2001 Eurydome S/2001 J 4 Jupiter XXXII Sheppard, Jewitt, Kleyna [64] [65]
December 9, 2001 Sponde S/2001 J 5 Jupiter XXXVI Sheppard, Jewitt, Kleyna [66] [67]
December 9, 2001 Kale S/2001 J 8 Jupiter XXXVII Sheppard, Jewitt, Kleyna [68] [69]
December 10, 2001 Autonoe S/2001 J 1 Jupiter XXVIII Sheppard, Jewitt, Kleyna [70] [71]
December 11, 2001 Thyone S/2001 J 2 Jupiter XXIX Sheppard, Jewitt, Kleyna [72] [73]
December 11, 2001 Aitne S/2001 J 11 Jupiter XXXI Sheppard, Jewitt, Kleyna [74] [75]
December 11, 2001 Euanthe S/2001 J 7 Jupiter XXXIII Sheppard, Jewitt, Kleyna [76] [77]
December 11, 2001 Euporie S/2001 J 10 Jupiter XXXIV Sheppard, Jewitt, Kleyna [78] [79]
December 11, 2001 Orthosie S/2001 J 9 Jupiter XXXV Sheppard, Jewitt, Kleyna [80] [81]
December 11, 2001 Pasithee S/2001 J 6 Jupiter XXXVIII Sheppard, Jewitt, Kleyna [82] [83]
2002
August, 2002 S/2002 N1 Holman, Kavelaars, Grav, Fraser, Milisavljevic [84] [85]
August, 2002 S/2002 N2 Holman, Kavelaars, Grav, Fraser, Milisavljevic [86] [87]
August, 2002 S/2002 N3 Holman, Kavelaars, Grav, Fraser, Milisavljevic [88] [89]
October 31, 2002 S/2002 J1 Sheppard [90] [91]
2003
2003 S/1986 U10* (Confirmed) [92]
2003 S/2001 U3* [93]
(Probably from images taken in 2001)
February 5, 2003 S/2003 S1 Holman et al., Gladman et al. [94]
March 4, 2003 S/2003 J1 Sheppard [95] [96]
March 4, 2003 S/2003 J2 Sheppard [97] [98]
March 4, 2003 S/2003 J3 Sheppard [99] [100]
March 4, 2003 S/2003 J4 Sheppard [101] [102]
March 4, 2003 S/2003 J5 Sheppard [103] [104]
March 4, 2003 S/2003 J6 Sheppard [105] [106]
March 4, 2003 S/2003 J7 Sheppard [107] [108]
March 6, 2003 S/2003 J8 Sheppard [109] [110]
March 7, 2003 S/2003 J9 Sheppard [111] [112]
March 7, 2003 S/2003 J10 Sheppard [113] [114]
March 7, 2003 S/2003 J11 Sheppard [115] [116]
March 7, 2003 S/2003 J12 Sheppard [117] [118]
April 11, 2003 S/2003 J13 Sheppard [119]
April 11, 2003 S/2003 J14 Sheppard [120]
April 11, 2003 S/2003 J15 Sheppard [121]
April 11, 2003 S/2003 J16 Gladman [122]
April 11, 2003 S/2003 J17 Gladman [123]
April 11, 2003 S/2003 J18 Gladman [124]
April 30, 2003 S/2003 J19 Gladman [125] [126]
April 30, 2003 S/2003 J20 Sheppard [127] [128]
May 30, 2003 S/2003 J21 Sheppard, Gladman [129] [130]
August 25, 2003 S/2003 U1 Showalter, Lissauer [131]
August 25, 2003 S/2003 U2 Showalter, Lissauer [132]
August 29, 2003 S/2001 U2* Holman et al., Gladman et al. [133] [134]
(Confirming images taken in 2001)
August 29, 2003 S/2002 N4* Holman et al., Gladman et al. [135] [136]
(From images taken in 2002)
August 29, 2003 S/2003 U3 Sheppard [137] [138]
September 3, 2003 S/2003 N1 Jewitt, Kleyna, Sheppard [139] [140]
2004
February 4, 2004 S/2003 J23* Sheppard [141] [142]
(From images taken in 2003)
February 25, 2004 S/2003 J22* Sheppard, Gladman [143] [144]
(From images taken in 2003)


*Note: Marked moons had complicated discoveries. Several moons took several years to be confirmed, and in several cases were actually lost and rediscovered. Others were found in Voyager photographs years after they were taken.

Sources

See also

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