Timeline of discovery of solar system planets and their natural satellites

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This timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history.

Historically the naming of natural satellites did not always match the times of their discovery.

In the following tables, planetary satellites are indicated in bold type (e.g. Moon) while planets, major or minor, which directly circle the Sun are in italic type (e.g. Earth). The tables are sorted by publication/announcement date. Dates are annotated with the following symbols:

  • i: for date of first imaging (photography, etc.);
  • o: for date of first human visual observation, either through telescope or on photographic plate (the true "discovery" moment);
  • p: for date of announcement or publication.

*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.

Contents

[edit] Color code

The planets and their natural satellites are marked in the following colors:

Planets Dwarf planets
Mercury Jupiter and satellites Ceres
Venus Saturn and satellites Pluto and satellites
Earth and satellite Uranus and satellites Eris and satellite
Mars and satellites Neptune and satellites

[edit] Prehistory

Prehistory
Date Name Designation Image Planet/Number Designation References/Notes
Unknown Sun
Star In the Ptolemaic system, the Earth was believed to be at the center of the cosmos. Seven planets were placed in orbit around it in an order of increasing distance from the Earth, first established by the Greek Stoics: the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn. This list included two objects, the Sun and the Moon, which are no longer considered to be planets; it also excluded the Earth.
Unknown Mercury
1st Planet In Nicolaus Copernicus' heliocentric system (De Revolutionibus Orbium Coelestium, 1543) the Earth came to be considered a planet revolving with the other planets around the Sun, in the following order of distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, and Saturn. The Sun, now situated near the center of revolution, was no longer considered a planet.
Venus
2nd Planet
Earth
3rd Planet
Mars
4th Planet
Jupiter
5th Planet
Saturn
6th Planet
Unknown Moon
Earth I In the Copernican system, the Moon was considered to be no longer a planet but a natural satellite of the Earth, and was the only body in that system whose revolution was not centered on the Sun.

[edit] 17th century

17th century
Date Name Designation Image Planet/Number Designation References/Notes
1610s
o: January 7, 1610
p: March 13, 1610		 Callisto
Jupiter IV Galileo, Sidereus Nuncius, [1]. The Galilean moons. Note: One of the moons may have been recorded by the Chinese astronomer Gan De in 364 BC. The Galilean satellites were the first celestial objects that were confirmed to orbit an object other than the Earth.
Io
Jupiter I
Europa
Jupiter II
o: January 11, 1610
p: March 13, 1610		 Ganymede
Jupiter III
1650s
o: March 25, 1655
p: March 5, 1656		 Titan
Saturn VI Huygens, [2]. Huygens first "published" his discovery as an anagram, sent out on June 13, 1655; later published in pamphlet form as De Saturni luna Observatio Nova and in full in Systema Saturnium (July 1659).
1670s
o: October 25, 1671
p: 1673		 Iapetus
Saturn VIII Cassini, [3]. Cassini published these two discoveries in Découverte de deux nouvelles planètes autour de Saturne (Sébastien Mabre-Cramoisy, Paris, 1673), translated as A Discovery of two New Planets about Saturn, made in the Royal Parisian Observatory by Signor Cassini, Fellow of both the Royal Societys, of England and France; English't out of French., Philosophical Transactions 8 (1673), pp. 5178-5185.
o: December 23, 1672
p: 1673		 Rhea
Saturn V
1680s
o: March 21, 1684
p: April 22, 1686		 Tethys
Saturn III Cassini. Cassini published these two discoveries on April 22, 1686, according to 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., Philosophical Transactions 16 (1686-1692) pp. 79-85.
Together with his previous two discoveries, Cassini named these satellites Sidera Lodoicea.

In his work Kosmotheôros (published posthumously in 1698), Christiaan Huygens relates "Jupiter you see has his four, and Saturn his five Moons about him, all plac’d in their Orbits."
Dione
Saturn IV
Date Name Designation Image Planet/Number Designation References/Notes

[edit] 18th century

18th century
Date Name Designation Image Planet/Number Designation References/Notes
1780s
o: March 13, 1781
p: April 26, 1781		 Uranus
7th Planet Herschel [4]. Herschel first reported the discovery of Uranus on April 26, 1781, hedging by calling it a "comet": Account of a Comet. By Mr. Herschel, F. R. S.; communicated by Dr. Watson, Jun. of Bath, F. R. S., Philosophical Transactions of the Royal Society of London, Vol. 71, pp. 492-501.
o: January 11, 1787
p: February 15, 1787		 Titania
Uranus III Herschel, An Account of the Discovery of Two Satellites revolving round the Georgian Planet., Philosophical Transactions of the Royal Society of London, Vol. 77, pp. 125-129, 1787
Oberon
Uranus IV
o: August 28, 1789 [5]
p: November 12, 1789		 Enceladus
Saturn II Herschel, Account of the Discovery of a Sixth and Seventh Satellite of the Planet Saturn; with Remarks on the Construction of its Ring, its Atmosphere, its Rotation on an Axis, and its spheroidical Figure, Philosophical Transactions of the Royal Society of London, Vol. 80, pp. 1-20, 1790 (read November 12, 1789).
o: September 17, 1789
p: November 12, 1789		 Mimas
Saturn I
Date Name Designation Image Planet/Number Designation References/Notes

[edit] 19th century

19th century
Date Name Designation Image Planet/Number Designation References/Notes
1800s
o: January 1, 1801
p: 1801		 Ceres
8th Planet (1801)
Asteroid (1851)
Dwarf planet (2006)		 Giuseppe Piazzi. He first announced his discovery on January 24, 1801, in letters to fellow astronomers. The first formal publication was the September 1801 issue of the Monatliche Correspondenz.
1840s
o: September 23, 1846
p: November 13, 1846		 Neptune
13th Planet (1846)
8th Planet (1851)		 Galle and Le Verrier [6] [7]
o: October 10, 1846
p: November 13, 1846		 Triton
Neptune I Lassell [8]
o: September 16, 1848
p: October, 1848		 Hyperion
Saturn VII Bond, Bond, Lassell [9] [10]
1850s
o: October 24, 1851 Ariel
Uranus I Lassell [11]
Umbriel
Uranus II
1870s
o: August 12, 1877 Deimos
Mars II Hall [12] [13] [14] [15]
o: August 18, 1877 Phobos
Mars I
1890s
o: September 9, 1892
p: October 4, 1892		 Amalthea
Jupiter V Barnard [16]
i: August 16, 1898
o: March 17, 1899		 Phoebe
Saturn IX Pickering [17] [18]
Date Name Designation Image Planet/Number Designation References/Notes

[edit] 20th century

20th century
Date Name Designation Image Planet/Number Designation References/Notes
1900s
i: December 3, 1904
p: January 6, 1905		 Himalia (formerly known as Hestia)
Jupiter VI Perrine [19] [20] [21] [22]
i: January 2, 1905
p: February 27, 1905		 Elara (formerly known as Hera) Jupiter VII Perrine [23] [24] [25]
i: January 27, 1908
o: February 28, 1908
p: March 1-6 1908		 Pasiphaë (formerly known as Poseidon) Jupiter VIII Melotte [26] [27]
1910s
i: July 21, 1914 Sinope (formerly known as Hades) Jupiter IX Nicholson [28]
1930s
i: January 23, 1930
o: February 18, 1930
p: March 13, 1930		 Pluto
9th Planet (1930)
Dwarf planet (2006)		 Tombaugh [29]
i: July 6, 1938 Lysithea (formerly known as Demeter) Jupiter X Nicholson [30]
i: July 30, 1938 Carme (formerly known as Pan) Jupiter XI Nicholson [31]
1940s
i: February 16, 1948 Miranda
Uranus V Kuiper [32]
i: May 1, 1949 Nereid
Neptune II Kuiper [33] [34]
1950s
i: September 28, 1951 Ananke (formerly known as Adrastea) Jupiter XII Nicholson [35]
1960s
i: December 15, 1966 Janus* S/1966 S 2
Saturn X Dollfus [36] [37] [38] [39] [40] [41]
(Dollfus may have seen either Janus or Epimetheus)
i: December 18, 1966 Epimetheus* Saturn XI Walker [42]
1970s
i: September 11, 1974
p: September 20, 1974		 Leda Jupiter XIII Kowal [43] [44] [45] [46]
i: September 30, 1975
p: October 3, 1975		 Themisto* S/1975 J 1 Jupiter XVIII Kowal [47] [48] [49]
(Discovered and then lost)
i: April 13, 1978
o: June 22, 1978		 Charon S/1978 P 1
Pluto I Christy [50] [51]
i: July 8, 1979
p: November 23, 1979		 Adrastea S/1979 J 1
Jupiter XV Jewitt, Danielson / Voyager 2 [52] [53] [54] [55]

[56] [57]
1980s
Date Name Designation Image Planet/Number Designation References/Notes
i: February 19, 1980 Janus* S/1980 S 1
Saturn X [58] [59] [60] [61] [62]
(Confirmed by Voyager 1)
i: February 26, 1980 Epimetheus* S/1980 S 3
Saturn XI [63] [64] [65] [66] [67]
(Confirmed by Voyager 1)
i: March 1, 1980 Helene S/1980 S 6
Saturn XII Laques, Lecacheux [68] [69] [70] [71]
i: March 13, 1980 Calypso S/1980 S 25
Saturn XIV Pascu, Seidelmann, Baum, Currie [72] [73]
i: April 8, 1980 Telesto S/1980 S 13
Saturn XIII Smith, Reitsema, Larson, Fountain, Voyager 1 [74] [75]
i: March 5, 1979
p: April 28, 1980		 Thebe S/1979 J 2
Jupiter XIV Synnott, Voyager 1 [76] [77]
i:March 4, 1979
p: August 26, 1980		 Metis S/1979 J 3
Jupiter XVI Synnott, Voyager 1 [78]
o: October, 1980 Atlas S/1980 S 28
Saturn XV Terrile, Voyager 1 [79]
Prometheus S/1980 S 27
Saturn XVI Collins, Voyager 1 [80]
Pandora S/1980 S 26
Saturn XVII Collins, Voyager 1 [81]
i: May 24, 1981
p: 29 May 1981		 Larissa* S/1981 N 1
= S/1989 N 2
Neptune VII Reitsema, Hubbard, Lebofsky, Tholen, Voyager 2 [82] [83]
i: December 30, 1985 Puck S/1985 U 1
Uranus XV Synnott, Voyager 2 [84]
i: January 3, 1986 Juliet S/1986 U 2 Uranus XI Synnott, Voyager 2 [85] [86]
Portia S/1986 U 1 Uranus XII Synnott, Voyager 2 [87] [88]
i: January 9, 1986 Cressida S/1986 U 3 Uranus IX Synnott, Voyager 2 [89] [90]
i: January 13, 1986 Desdemona S/1986 U 6 Uranus X Synnott, Voyager 2 [91] [92]
Rosalind S/1986 U 4 Uranus XIII Synnott, Voyager 2 [93] [94]
Belinda S/1986 U 5 Uranus XIV Synnott, Voyager 2 [95] [96]
i: January 20, 1986 Cordelia S/1986 U 7 Uranus VI Terrile, Voyager 2 [97]
Ophelia S/1986 U 8 Uranus VII Terrile, Voyager 2 [98]
i: January 23, 1986 Bianca S/1986 U 9 Uranus VIII Smith, Voyager 2 [99]
i: June 16, 1989
p: July 7, 1989		 Proteus S/1989 N 1
Neptune VIII Synnott, Voyager 2 [100]
i: July 28, 1989
p: August 2, 1989		 Despina S/1989 N 3 Neptune V Synnott, Voyager 2 [101]
Galatea S/1989 N 4 Neptune VI Synnott, Voyager 2 [102]
i: September 18, 1989
p: September 29, 1989		 Thalassa S/1989 N 5 Neptune IV Terrile, Voyager 2 [103]
Naiad S/1989 N 6 Neptune III Terrile, Voyager 2 [104]
1990s
Date Name Designation Image Planet/Number Designation References/Notes
i: August 22, 1981
p: July 16, 1990		 Pan* S/1981 S 13
Saturn XVIII Showalter, Voyager 2 [105]
i: August 23, 1981
p: April 14, 1995		 Pallene* (see below) S/1981 S 14   Saturn Gordon, Murray and Beurle [106]

[107]
i: September 6, 1997
p: October 31, 1997		 Caliban S/1997 U 1 Uranus XVI Gladman, Nicholson, Burns, Kavelaars [108]
Sycorax S/1997 U 2 Uranus XVII Gladman, Nicholson, Burns, Kavelaars [109]
i: January 18, 1986
p: May 18, 1999		 Perdita* S/1986 U 10 Uranus XXV Karkoschka, Voyager 2 [110]
i: July 18, 1999 Setebos S/1999 U 1 Uranus XIX Kavelaars, Gladman, Holman, Petit, Scholl [111]
Stephano S/1999 U 2 Uranus XX Gladman, Holman, Kavelaars, Petit, Scholl [112]
Prospero S/1999 U 3 Uranus XVIII Holman, Kavelaars, Gladman, Petit, Scholl [113]
2000s
Date Name Designation Image Planet/Number Designation References/Notes
i: October 6, 1999
p: July 20, 2000 /
 Callirrhoe S/1999 J 1 Jupiter XVII Scotti, Spahr, McMillan, Larsen, Montani, Gleason, Gehrels [114] [115]
i: August 7, 2000 Ymir S/2000 S 1 Saturn XIX Gladman [116] [117]
Paaliaq S/2000 S 2 Saturn XX Gladman [118] [119]
Kiviuq S/2000 S 5 Saturn XXIV Gladman [120] [121]
i: September 23, 2000 Siarnaq S/2000 S 3 Saturn XXIX Gladman, Kavelaars [122] [123]
Tarvos S/2000 S 4 Saturn XXI Kavelaars, Gladman [124] [125]
Ijiraq S/2000 S 6 Saturn XXII Kavelaars, Gladman [126] [127]
Thrymr S/2000 S 7 Saturn XXX Gladman, Kavelaars [128] [129]
Skathi S/2000 S 8 Saturn XXVII Kavelaars, Gladman [130] [131]
Mundilfari S/2000 S 9 Saturn XXV Gladman, Kavelaars [132] [133]
Erriapo S/2000 S 10 Saturn XXVIII Kavelaars, Gladman [134] [135]
Suttungr S/2000 S 12 Saturn XXIII Gladman, Kavelaars [136] [137]
i: November 9, 2000
p: December 19, 2000		 Albiorix S/2000 S 11 Saturn XXVI Holman, Spahr [138] [139]
i: November 21, 2000
p: November 25, 2000		 Themisto* S/2000 J 1 Jupiter XVIII Sheppard, Jewitt, Fernández, Magnier (Rediscovered) [140] [141]
Date Name Designation Image Planet/Number Designation References/Notes

[edit] 21st century

21st century
Date Name Designation Image Planet/Number Designation References/Notes

i: November 23, 2000
p: January 5, 2001

 Kalyke S/2000 J 2   Jupiter XXIII Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [142] [143] [144]
Iocaste S/2000 J 3   Jupiter XXIV
Erinome S/2000 J 4   Jupiter XXV
Harpalyke S/2000 J 5   Jupiter XXII
Isonoe S/2000 J 6   Jupiter XXVI
Praxidike S/2000 J 7   Jupiter XXVII
i: November 25, 2000
p: January 5, 2001		 Megaclite S/2000 J 8   Jupiter XIX Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [145] [146]
Taygete S/2000 J 9   Jupiter XX
i: November 26, 2000
p: January 5, 2001		 Chaldene S/2000 J 10   Jupiter XXI Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [147] [148]
i: December 5, 2000
p: January 5, 2001		   S/2000 J 11   Jupiter Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [149] [150]
Date Name Designation Image Planet/Number Designation References/Notes
i: December 9, 2001
p: May 16, 2002		 Hermippe S/2001 J 3   Jupiter XXX Sheppard, Jewitt, Kleyna [151] [152]
Eurydome S/2001 J 4   Jupiter XXXII
Sponde S/2001 J 5   Jupiter XXXVI
Kale S/2001 J 8   Jupiter XXXVII
i: December 10, 2001
p: May 16, 2002		 Autonoe S/2001 J 1   Jupiter XXVIII Sheppard, Jewitt, Kleyna [153] [154]
i: December 11, 2001
p: May 16, 2002		 Thyone S/2001 J 2   Jupiter XXIX Sheppard, Jewitt, Kleyna [155] [156]
Pasithee S/2001 J 6   Jupiter XXXVIII
Euanthe S/2001 J 7   Jupiter XXXIII
Orthosie S/2001 J 9   Jupiter XXXV
Euporie S/2001 J 10   Jupiter XXXIV
Aitne S/2001 J 11   Jupiter XXXI
i: August 13, 2001
p: September 30, 2002		 Trinculo S/2001 U 1   Uranus XXI Holman, Kavelaars, Milisavljevic [157] [158]
i: October 31, 2002
p: December 18, 2002		 Arche S/2002 J 1   Jupiter XLIII Sheppard, Meech, Hsieh, Tholen, Tonry [159] [160]
Date Name Designation Image Planet/Number Designation References/Notes
i: July 23, 2002
p: January 13, 2003		   S/2002 N 2   Neptune Holman, Kavelaars, Grav, Fraser, Milisavljevic [161] [162]
i: August 10, 2002
p: January 13, 2003		   S/2002 N 1
i: August 11, 2002
p: January 13, 2003		   S/2002 N 3
i: February 5, 2003
p: March 4, 2003		 Eukelade S/2003 J 1   Jupiter XLVII Sheppard, Jewitt, Kleyna, Fernández, Hsieh [163] [164]
  S/2003 J 2   Jupiter
S/2003 J 3
S/2003 J 4
i: February 6, 2003
p: March 4, 2003		   S/2003 J 5   Jupiter Sheppard, Jewitt, Kleyna, Fernández, Hsieh [165] [166]
Helike S/2003 J 6 Jupiter XLV
i: February 8, 2003
p: March 4, 2003		 Aoede S/2003 J 7 Jupiter XLI Sheppard, Jewitt, Kleyna, Fernández, Hsieh [167] [168]
Hegemone S/2003 J 8 Jupiter XXXIX Sheppard, Jewitt, Kleyna, Fernández [169] [170]
i: February 6, 2003
p: March 7, 2003		   S/2003 J 9   Jupiter Sheppard, Jewitt, Kleyna, Fernández [171] [172]
S/2003 J 10
Kallichore S/2003 J 11   Jupiter XLIV
i: February 8, 2003
p: March 7, 2003		   S/2003 J 12   Jupiter Sheppard, Jewitt, Kleyna, Fernández [173] [174]
i: February 5, 2003
p: April 11, 2003		 Narvi S/2003 S 1   Saturn XXXI Sheppard, Jewitt, Kleyna [175]
i: February 9, 2003
p: April 11, 2003		 Cyllene S/2003 J 13   Jupiter XLVIII Sheppard, Jewitt, Kleyna [176]
i: February 8, 2003
p: April 11, 2003		   S/2003 J 14   Jupiter Sheppard, Jewitt, Kleyna [177]
i: February 6, 2003
p: April 11, 2003		   S/2003 J 15   Jupiter Sheppard, Jewitt, Kleyna, Fernández [178]
S/2003 J 16 Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, Allen [179]
i: February 8, 2003
p: April 11, 2003		   S/2003 J 17   Jupiter Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, Allen [180]
i: February 6, 2003
p: April 11, 2003		   S/2003 J 18   Jupiter Gladman, Kavelaars, Petit, Allen, Sheppard, Jewitt, Kleyna [181]
i: February 6, 2003
p: April 30, 2003		   S/2003 J 19   Jupiter Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, Allen [182] [183]
i: February 9, 2003
p: April 30, 2003		 Carpo S/2003 J 20 Jupiter XLVI Sheppard, Gladman, Kavelaars, Petit, Allen, Jewitt, Kleyna [184] [185]
i: February 6, 2003
p: May 30, 2003		 Mneme S/2003 J 21 Jupiter XL Sheppard, Jewitt, Kleyna, Gladman, Kavelaars, Petit, Allen [186] [187]
i: January 18, 1986
p: August 25, 2003		 Perdita* S/1986 U 10 Uranus XXV Karkoschka (Recovered by the Hubble Space Telescope) [188]
i: August 13, 2001
p: August 29, 2003		 Ferdinand* S/2001 U 2 Uranus XXIV 2001: Holman, Kavelaars, Milisavljevic;
2003: Scott S. Sheppard, David C. Jewitt [189] [190]
i: August 14, 2002
p: August 29, 2003		   S/2002 N 4*   Neptune Holman, Kavelaars, Grav, Fraser, Milisavljevic [191] [192]
i: August 29, 2003
p: September 3, 2003		 Psamathe S/2003 N 1   Neptune X Jewitt, Kleyna, Sheppard, Holman, Kavelaars [193] [194]
i: August 25, 2003
p: September 25, 2003		 Mab S/2003 U 1   Uranus XXVI Showalter, Lissauer [195]
Cupid S/2003 U 2   Uranus XXVII
i: August 13, 2001
p: October 8, 2003		 Francisco* S/2001 U 3   Uranus XXII Holman, Kavelaars, Milisavljevic, Gladman [196]
i: August 29, 2003
p: October 9, 2003		 Margaret S/2003 U 3   Uranus XXIII Sheppard, Jewitt [197] [198]
Date Name Designation Image Planet/Number Designation References/Notes
i: February 9, 2003
p: January 25, 2004		 Thelxinoe* S/2003 J 22   Jupiter XLII Sheppard, Jewitt, Kleyna, Gladman, Kavelaars, Petit, Allen [199] [200] [201]
(From images taken in 2003)
i: February 6, 2003
p: February 4, 2004		   S/2003 J 23*   Jupiter Sheppard, Jewitt, Kleyna, Fernández [202] [203]
i: June 1, 2004
p: August 16, 2004		 Methone* S/2004 S 1
Saturn XXXII Porco, Charnoz, Brahic, Dones / Cassini-Huygens [204]

[205]
Pallene S/2004 S 2
=S/1981 S 14
Saturn XXXIII
i: June 21, 2004
p: September 9, 2004		   S/2004 S 3
Saturn Murray, Porco et al. / Cassini-Huygens [206]

[207]
i: June 21?, 2004
p: September 9, 2004		   S/2004 S 4   Saturn Spitale, Porco et al. / Cassini-Huygens [208]

[209]
i: October 21, 2004
o: October 24, 2004
p: November 8, 2004		 Polydeuces S/2004 S 5
Saturn XXXIV Porco et al. / Cassini-Huygens

[210]
i: October 28, 2004
p: November 8, 2004		   S/2004 S 6   Saturn Porco et al. / Cassini-Huygens

[211]
Date Name Designation Image Planet/Number Designation References/Notes
i: December 12, 2004
p: May 4, 2005		   S/2004 S 7   Saturn Sheppard, Jewitt, Kleyna, Marsden
[212] [213] [214] [215]
S/2004 S 8
S/2004 S 9
S/2004 S 10
S/2004 S 11
S/2004 S 12
S/2004 S 13
S/2004 S 14
S/2004 S 15
i: December 13, 2004
p: May 4, 2005		   S/2004 S 16   Saturn Sheppard, Jewitt, Kleyna, Marsden
[216] [217] [218] [219]
S/2004 S 17
S/2004 S 18
i: May 1, 2005
p: May 6, 2005		 Daphnis S/2005 S 1
Saturn XXXV Porco et al. / Cassini-Huygens [220]
i: October 21, 2003
o: January 5, 2005
p: July 29, 2005		 Eris 2003 UB313
Dwarf planet Brown, Trujillo and Rabinowitz
i: September 10, 2005
p: October 3, 2005		 Dysnomia S/2005 (2003 UB313) 1 Eris I Brown, van Dam, Bouchez, Le Mignant, Campbell,
Chin, Conrad, Hartman, Johansson, Lafon, Rabinowitz,
Stomski, Summers, Trujillo, and Wizinowich [221]
i: May 15, 2005
o: June 15, 2005
p: October 31, 2005		 Nix S/2005 P 2   Pluto II Weaver, Stern, Mutchler, Steffl, Buie, Merline,
Spencer, Young, Young [222]
Hydra S/2005 P 1   Pluto III
Date Name Designation Image Planet/Number Designation References/Notes
i: December 12, 2004
o: March 6, 2006(?)
p: June 26, 2006		   S/2004 S 19   Saturn Sheppard, Jewitt, Kleyna [223] [224]
i: January 4, 2006
o: March 6, 2006(?)
p: June 26, 2006		   S/2006 S 1   Saturn Sheppard, Jewitt, Kleyna [225] [226]
S/2006 S 2
i: January 5, 2006
o: March 6, 2006 (?)
p: June 26, 2006		 S/2006 S 3
S/2006 S 4
S/2006 S 5
S/2006 S 6
S/2006 S 7
S/2006 S 8
Date Name Designation Image Planet/Number Designation References/Notes

[edit] See also

[edit] External links

     Planetary satellites: Terran • Martian • Jovian • Saturnian • Uranian • Neptunian
     Other satellite systems: Plutonian • Eridian • Asteroid satellites
     Largest satellites: Ganymede • Titan • Callisto • Io • Earth's Moon • Europa • Triton
Titania • Rhea • Oberon • Iapetus • Charon • Umbriel • Ariel • Dione • Tethys
 See also: inner satellites • trojans • irregulars • list by diameter • discovery timeline • naming
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