Timeline of natural satellites

From The Book of THoTH (Leaves of Wisdom)

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

For comparison, discovery dates of the first fifteen asteroids are also included, down to the end of 1851. Beginning in 1852, in light of the fact that new asteroids were being discovered every year (eight were discovered in 1852 alone) and that it was becoming difficult to find appropriate symbols for all of them, the asteroids were placed in a new section in astronomical almanacs and given a new notation to replace the old symbols. For several decades, however, at least Ceres, Pallas, Juno and Vesta were considered full-fledged planets.

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. When two dates are given, the first is publication, the second is the discovery observation's date. If a third date appears, it is the actual date of discovery (the date on which the discoverer first realised what he was looking at).

*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 1 Color code 2 Prehistory 3 17th century 4 18th century 5 19th century 6 20th century 7 21st century 8 Spurious Satellites 9 External links

Color code

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

Mercury

Venus

Earth and satellite

Mars and satellites

Jupiter and satellites

Saturn and satellites

Uranus and satellites

Neptune and satellites

Pluto and satellites

Template:Mpl and satellites

Prehistory

Prehistory
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
Unknown	Sun		Image:The_Sun_w920607.jpg|70px|center		The Ptolemaic geocentric model defined seven planets and ordered them, from the closest to the farthest to the Earth, as follows: the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn. This order was first established by the Greek Stoics. The enumeration of planets included two objects no longer considered as planets, the Sun and the Moon, and excluded the Earth.
Unknown	Mercury			Sol I	In Nicolaus Copernicus' heliocentric system (De Revolutionibus Orbium Coelestium, 1543) the Earth came to be considered as 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			Sol II
	Earth			Sol III
	Mars			Sol IV
	Jupiter			Sol V
	Saturn			Sol VI
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.

17th century

17th century
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
1610s
March 13 1610 / January 7 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
March 13 1610 / January 11 1610	Ganymede			Jupiter III
1650s
March 5 1656 / March 25 1655	Titan			Saturn VI	Huygens, [2]. Huygens first "published" his discovery as an anagram, sent out on June 13, 1655; later published in full in his Systema Saturnium.
1670s
October 25 1671	Iapetus			Saturn VIII	Cassini, [3]. Cassini published these two discoveries in Découverte de deux nouvelles planetes autour de Saturne (Sebastien Mabre-Cramoisy, 1673), translated as A Discovery of Two New Planets about Saturn, Made in the Royal Parisian Observatory by Signor Cassini, Philosophical Transactions 8 (1673), pp. 5178-5185. There may be earlier publications within the Journal des scavans.
December 23, 1672	Rhea			Saturn V
1680s
March 21, 1684	Tethys			Saturn III	Cassini. Cassini published these two discoveries on April 22, 1686, judging by 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. 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

18th century

18th century
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
1780s
March 13 1781	Uranus			Sol VII	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, Volume 71, pp. 492-501.
January 11 1787	Titania			Uranus III	Herschel
	Oberon			Uranus IV	Herschel
August 28 1789	Enceladus			Saturn II	Herschel
September 17 1789	Mimas			Saturn I	Herschel [5]
Date	Name	Designation	Image	Planet/Number Designation	References/Notes

19th century

19th century
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
1800s
January 1, 1801	1 Ceres			Asteroid	Giuseppe Piazzi
March 28, 1802	2 Pallas			Asteroid	Heinrich Wilhelm Olbers
September 1, 1804	3 Juno			Asteroid	Karl Ludwig Harding
March 29, 1807	4 Vesta			Asteroid	Heinrich Wilhelm Olbers
1840s
December 8, 1845	5 Astraea			Asteroid	Hencke [6]
September 23, 1846	Neptune			Sol VIII
October 10, 1846	Triton			Neptune I	Lassell [7] [8]
July 1, 1847	6 Hebe			Asteroid	Hencke [9]
August 13, 1847	7 Iris			Asteroid	Hind
October 18, 1847	8 Flora			Asteroid	Hind
April 25, 1848	9 Metis			Asteroid	Graham
September 16, 1848	Hyperion			Saturn VII	Bond, Bond, Lassell [10] [11]
April 12, 1849	10 Hygiea			Asteroid	de Gasparis
1850s
May 11, 1850	11 Parthenope			Asteroid	de Gasparis
September 13, 1850	12 Victoria			Asteroid	Hind
November 2, 1850	13 Egeria			Asteroid	de Gasparis
May 19, 1851	14 Irene			Asteroid	Hind
July 29, 1851	15 Eunomia			Asteroid	de Gasparis
October 24, 1851	Ariel			Uranus I	Lassell [12]
	Umbriel			Uranus II	Lassell [13]
1870s
August 12, 1877	Deimos			Mars II	Hall [14] [15] [16]
August 18, 1877	Phobos			Mars I	Hall [17] [18] [19]
1890s
October 4 1892 / September 9, 1892	Amalthea			Jupiter V	Barnard [20]
March 17 1899 / August 16, 1898	Phoebe			Saturn IX	Pickering [21] [22]
Date	Name	Designation	Image	Planet/Number Designation	References/Notes

20th century

20th century
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
1900s
January 6 1905 / December 3 1904	Himalia (formerly known as Hestia)			Jupiter VI	Perrine [23] [24] [25] [26]
February 27 1905 / January 2, 1905	Elara (formerly known as Hera)			Jupiter VII	Perrine [27] [28] [29]
March 1-6 1908 / January 27, 1908	Pasiphaë (formerly known as Poseidon)			Jupiter VIII	Melotte [30] [31]
1910s
July 21, 1914	Sinope (formerly known as Hades)			Jupiter IX	Nicholson [32]
1930s
March 13 1930 / January 23 1930 / February 18, 1930	Pluto			Sol IX	Tombaugh [33]
July 6, 1938	Lysithea (formerly known as Demeter)			Jupiter X	Nicholson [34]
July 30, 1938	Carme (formerly known as Pan)			Jupiter XI	Nicholson [35]
1940s
February 16, 1948	Miranda			Uranus V	Kuiper [36]
May 1, 1949	Nereid			Neptune II	Kuiper [37] [38]
1950s
September 28, 1951	Ananke (formerly known as Adrastea)			Jupiter XII	Nicholson [39]
1960s
December 15 1966	Janus*	S/1966 S 2		Saturn X	Dollfus [40] [41] [42] [43] [44] [45] (Dollfus may have seen either Janus or Epimetheus)
December 18 1966	Epimetheus*			Saturn XI	Walker [46]
1970s
September 20 1974 / September 11, 1974	Leda			Jupiter XIII	Kowal [47] [48] [49] [50]
October 3 1975 / September 30, 1975	Themisto*	S/1975 J 1		Jupiter XVIII	Kowal [51] [52] [53] (Discovered and then lost)
April 13, 1978	Charon	S/1978 P 1		Pluto I	Christy [54] [55]
November 23 1979 / July 8, 1979	Adrastea	S/1979 J 1		Jupiter XV	Jewitt, Danielson / Voyager 2 [56] [57] [58] [59] [60] [61]
1980s
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
January 19, 1980	Janus*	S/1980 S 1		Saturn X	[62] [63] [64] [65] [66] (Confirmed by Voyager 1)
January 26, 1980	Epimetheus*	S/1980 S 3		Saturn XI	[67] [68] [69] [70] [71] (Confirmed by Voyager 1)
March 1, 1980	Helene	S/1980 S 6		Saturn XII	Laques, Lecacheux [72] [73] [74] [75]
March 13, 1980	Calypso	S/1980 S 25		Saturn XIV	Pascu, Seidelmann, Baum, Currie [76] [77]
April 8, 1980	Telesto	S/1980 S 13		Saturn XIII	Smith, Reitsema, Larson, Fountain, Voyager 1 [78] [79]
April 28, 1980/ March 5, 1979	Thebe	S/1979 J 2		Jupiter XIV	Synnott, Voyager 1 [80] [81]
August 26, 1980/ March 4, 1979	Metis	S/1979 J 3		Jupiter XVI	Synnott, Voyager 1 [82]
October, 1980	Atlas	S/1980 S 28		Saturn XV	Terrile, Voyager 1 [83]
	Prometheus	S/1980 S 27		Saturn XVI	Collins, Voyager 1 [84]
	Pandora	S/1980 S 26		Saturn XVII	Collins, Voyager 1 [85]
December 30, 1985	Puck	S/1985 U 1		Uranus XV	Synnott, Voyager 2 [86]
January 3, 1986	Juliet	S/1986 U 2		Uranus XI	Synnott, Voyager 2 [87] [88]
	Portia	S/1986 U 1		Uranus XII	Synnott, Voyager 2 [89] [90]
January 9, 1986	Cressida	S/1986 U 3		Uranus IX	Synnott, Voyager 2 [91] [92]
January 13, 1986	Desdemona	S/1986 U 6		Uranus X	Synnott, Voyager 2 [93] [94]
	Rosalind	S/1986 U 4		Uranus XIII	Synnott, Voyager 2 [95] [96]
	Belinda	S/1986 U 5		Uranus XIV	Synnott, Voyager 2 [97] [98]
January 20, 1986	Cordelia	S/1986 U 7		Uranus VI	Terrile, Voyager 2 [99]
	Ophelia	S/1986 U 8		Uranus VII	Terrile, Voyager 2 [100]
January 23, 1986	Bianca	S/1986 U 9		Uranus VIII	Smith, Voyager 2 [101]
July 7 1989 / < June 16, 1989	Proteus	S/1989 N 1		Neptune VIII	Synnott, Voyager 2 [102] [103]
August 2 1989 / < July 28, 1989	Larissa	S/1989 N 2		Neptune VII	Tholen, Voyager 2 [104]
	Despina	S/1989 N 3		Neptune V	Synnott, Voyager 2 [105]
	Galatea	S/1989 N 4		Neptune VI	Synnott, Voyager 2 [106]
September 29 1989 / < September 18, 1989	Thalassa	S/1989 N 5		Neptune IV	Terrile, Voyager 2 [107]
	Naiad	S/1989 N 6		Neptune III	Terrile, Voyager 2 [108]
1990s
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
July 16, 1990 / August 22, 1981	Pan*	S/1981 S 13		Saturn XVIII	Showalter, Voyager 2 [109]
April 14, 1995 / August 23, 1981		S/1981 S 14 (see Methone below)		Saturn	Gordon, Murray and Beurle [110] [111]
September 6, 1997	Caliban	S/1997 U 1		Uranus XVI	Gladman, Nicholson, Burns, Kavelaars [112]
	Sycorax	S/1997 U 2		Uranus XVII	Gladman, Nicholson, Burns, Kavelaars [113]
May 18, 1999 / January 18, 1986	Perdita	S/1986 U 10*		Uranus XXV	Karkoschka, Voyager 2 [114]
July 18, 1999	Setebos	S/1999 U 1		Uranus XIX	Kavelaars, Gladman, Holman, Petit, Scholl [115]
	Stephano	S/1999 U 2		Uranus XX	Gladman, Holman, Kavelaars, Petit, Scholl [116]
	Prospero	S/1999 U 3		Uranus XVIII	Holman, Kavelaars, Gladman, Petit, Scholl [117]
2000s
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
July 18-20, 2000 / October 6, 1999	Callirrhoe	S/1999 J 1		Jupiter XVII	Larsen, Montani, Gleason, Gehrels [118] [119]
August 7, 2000	Ymir	S/2000 S 1		Saturn XIX	Gladman [120] [121]
	Paaliaq	S/2000 S 2		Saturn XX	Gladman [122] [123]
	Kiviuq	S/2000 S 5		Saturn XXIV	Gladman [124] [125]
September 23, 2000	Siarnaq	S/2000 S 3		Saturn XXIX	Gladman, Kavelaars [126] [127]
	Tarvos	S/2000 S 4		Saturn XXI	Kavelaars, Gladman [128] [129]
	Ijiraq	S/2000 S 6		Saturn XXII	Kavelaars, Gladman [130] [131]
	Thrymr	S/2000 S 7		Saturn XXX	Gladman, Kavelaars [132] [133]
	Skathi	S/2000 S 8		Saturn XXVII	Kavelaars, Gladman [134] [135]
	Mundilfari	S/2000 S 9		Saturn XXV	Gladman, Kavelaars [136] [137]
	Erriapo	S/2000 S 10		Saturn XXVIII	Kavelaars, Gladman [138] [139]
	Suttungr	S/2000 S 12		Saturn XXIII	Gladman, Kavelaars [140] [141]
November 9, 2000	Albiorix	S/2000 S 11		Saturn XXVI	Holman, Spahr [142] [143]
November 25 2000/ November 21, 2000	Themisto*	S/2000 J 1		Jupiter XVIII	Sheppard, Jewitt, Fernández, Magnier (Rediscovered) [144] [145]
Date	Name	Designation	Image	Planet/Number Designation	References/Notes

21st century

21st century
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
January 5, 2001/ November 23, 2000	Kalyke	S/2000 J 2		Jupiter XXIII	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [146] [147]
	Iocaste	S/2000 J 3		Jupiter XXIV	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [148] [149]
	Erinome	S/2000 J 4		Jupiter XXV	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [150] [151]
	Harpalyke	S/2000 J 5		Jupiter XXII	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [152] [153]
	Isonoe	S/2000 J 6		Jupiter XXVI	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [154] [155]
	Praxidike	S/2000 J 7		Jupiter XXVII	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [156] [157]
January 5, 2001/ November 25, 2000	Megaclite	S/2000 J 8		Jupiter XIX	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [158] [159]
	Taygete	S/2000 J 9		Jupiter XX	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [160] [161]
January 5, 2001/ November 26, 2000	Chaldene	S/2000 J 10		Jupiter XXI	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [162] [163]
January 5, 2001/ December 5, 2000		S/2000 J 11		Jupiter	Sheppard, Jewitt, Fernández, Magnier, Dahm, Evans [164] [165]
August 13, 2001	Trinculo	S/2001 U 1		Uranus XXI	Holman, Kavelaars, Milisavljevic [166] [167]
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
May 16, 2002/ December 9, 2001	Hermippe	S/2001 J 3		Jupiter XXX	Sheppard, Jewitt, Kleyna [168] [169]
	Eurydome	S/2001 J 4		Jupiter XXXII	Sheppard, Jewitt, Kleyna [170] [171]
	Sponde	S/2001 J 5		Jupiter XXXVI	Sheppard, Jewitt, Kleyna [172] [173]
	Kale	S/2001 J 8		Jupiter XXXVII	Sheppard, Jewitt, Kleyna [174] [175]
May 16, 2002/ December 10, 2001	Autonoe	S/2001 J 1		Jupiter XXVIII	Sheppard, Jewitt, Kleyna [176] [177]
May 16, 2002/ December 11, 2001	Thyone	S/2001 J 2		Jupiter XXIX	Sheppard, Jewitt, Kleyna [178] [179]
	Pasithee	S/2001 J 6		Jupiter XXXVIII	Sheppard, Jewitt, Kleyna [180] [181]
	Euanthe	S/2001 J 7		Jupiter XXXIII	Sheppard, Jewitt, Kleyna [182] [183]
	Orthosie	S/2001 J 9		Jupiter XXXV	Sheppard, Jewitt, Kleyna [184] [185]
	Euporie	S/2001 J 10		Jupiter XXXIV	Sheppard, Jewitt, Kleyna [186] [187]
	Aitne	S/2001 J 11		Jupiter XXXI	Sheppard, Jewitt, Kleyna [188] [189]
August 13, 2002		S/2002 N 3		Neptune	Holman, Kavelaars, Grav, Fraser, Milisavljevic [190] [191]
August 14, 2002		S/2002 N 1		Neptune	Holman, Kavelaars, Grav, Fraser, Milisavljevic [192] [193]
		S/2002 N 2			Holman, Kavelaars, Grav, Fraser, Milisavljevic [194] [195]
December 18 2002/ October 31, 2002	Arche	S/2002 J 1		Jupiter XLIII	Sheppard, Meech, Hsieh, Tholen, Tonry [196] [197]
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
August 25, 2003/ January 18, 1986	Perdita	S/1986 U 10*		Uranus XXV	Karkoschka (Recovered by the Hubble Space Telescope) [198]
October 2003/ August 13, 2001	Francisco	S/2001 U 3*		Uranus XXII	Holman, Kavelaars, Milisavljevic, Gladman [199]
February 5, 2003	Narvi	S/2003 S 1		Saturn XXXI	Sheppard, Jewitt, Kleyna [200]
March 4 2003/ February 5, 2003	Eukelade	S/2003 J 1		Jupiter XLVII	Sheppard, Jewitt, Kleyna, Fernández, Hsieh [201] [202]
		S/2003 J 2		Jupiter	Sheppard, Jewitt, Kleyna, Fernández, Hsieh [203] [204]
		S/2003 J 3			Sheppard, Jewitt, Kleyna, Fernández, Hsieh [205] [206]
		S/2003 J 4			Sheppard, Jewitt, Kleyna, Fernández, Hsieh [207] [208]
March 4 2003/ February 6, 2003		S/2003 J 5		Jupiter	Sheppard, Jewitt, Kleyna, Fernández, Hsieh [209] [210]
	Helike	S/2003 J 6		Jupiter XLV	Sheppard, Jewitt, Kleyna, Fernández, Hsieh [211] [212]
March 4 2003/ February 8, 2003	Aoede	S/2003 J 7		Jupiter XLI	Sheppard, Jewitt, Kleyna, Fernández, Hsieh [213] [214]
	Hegemone	S/2003 J 8		Jupiter XXXIX	Sheppard, Jewitt, Kleyna, Fernández [215] [216]
March 7 2003/ February 6, 2003		S/2003 J 9		Jupiter	Sheppard, Jewitt, Kleyna, Fernández [217] [218]
		S/2003 J 10			Sheppard, Jewitt, Kleyna]], Fernández [219] [220]
	Kallichore	S/2003 J 11		Jupiter XLIV	Sheppard, Jewitt, Kleyna, Fernández [221] [222]
March 7 2003/ February 8, 2003		S/2003 J 12		Jupiter	Sheppard, Jewitt, Kleyna, Fernández [223] [224]
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
April 11 2003/ February 9, 2003	Cyllene	S/2003 J 13		Jupiter XLVIII	Sheppard, Jewitt, Kleyna [225]
April 11 2003/ February 8, 2003		S/2003 J 14		Jupiter	Sheppard, Jewitt, Kleyna [226]
April 11 2003/</br>February 6, 2003		S/2003 J 15		Jupiter	Sheppard, Jewitt, Kleyna, Fernández [227]
		S/2003 J 16			Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, Allen [228]
April 11 2003/ February 8, 2003		S/2003 J 17		Jupiter	Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, Allen [229]
April 11 2003/ February 6, 2003		S/2003 J 18		Jupiter	Gladman, Kavelaars, Petit, Allen, Sheppard, Jewitt, Kleyna [230]
April 30 2003/ February 6, 2003		S/2003 J 19		Jupiter	Gladman, Sheppard, Jewitt, Kleyna]], Kavelaars, Petit, Allen [231] [232]
April 30 2003/ February 9, 2003	Carpo	S/2003 J 20		Jupiter XLVI	Sheppard, Gladman, Kavelaars, Petit, Allen, Jewitt, Kleyna [233] [234]
May 30 2003/ February 6, 2003	Mneme	S/2003 J 21		Jupiter XL	Sheppard, Jewitt, Kleyna, Gladman, Kavelaars, Petit, Allen [235] [236]
August 25, 2003	Mab	S/2003 U 1		Uranus XXVI	Showalter, Lissauer [237]
	Cupid	S/2003 U 2		Uranus XXVII	Showalter, Lissauer [238]
August 29, 2003/ August 13, 2001	Ferdinand	S/2001 U 2*		Uranus XXIV	2001: Holman, Kavelaars, Milisavljevic; 2003: Scott S. Sheppard, David C. Jewitt [239] [240]
August 29, 2003/ August 14, 2002		S/2002 N 4*		Neptune	Holman, Kavelaars, Grav, Fraser, Milisavljevic [241] [242]
August 29, 2003	Margaret	S/2003 U 3		Uranus XXIII	Sheppard, Jewitt [243] [244]
September 3 2003/ August 29, 2003	Psamathe	S/2003 N 1		Neptune X	Jewitt, Kleyna, Sheppard, Holman, Kavelaars [245] [246]
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
January 25, 2004/ February 9, 2003	Thelxinoe*	S/2003 J 22		Jupiter XLII	Sheppard, Jewitt, Kleyna, Gladman, Kavelaars, Petit, Allen [247] [248] [249] (From images taken in 2003)
February 4, 2004/ February 6, 2003		S/2003 J 23*		Jupiter	Sheppard, Jewitt, Kleyna, Fernández [250] [251]
August 16 2004 / June 1, 2004	Methone	S/2004 S 1 =S/1981 S 14?		Saturn XXXII	Porco, Charnoz, Brahic, Dones / Cassini-Huygens [252] [253]
	Pallene	S/2004 S 2		Saturn XXXIII	Porco, Charnoz, Brahic, Dones / Cassini-Huygens [254] [255]
September 9 2004 / June 21, 2004		S/2004 S 3		Saturn	Murray, Porco et al. / Cassini-Huygens [256] [257]
September 9 2004 / June 21?, 2004		S/2004 S 4		Saturn	Spitale, Porco et al. / Cassini-Huygens [258] [259]
November 8 2004 / October 21, 2004	Polydeuces	S/2004 S 5		Saturn XXXIV	Porco et al. / Cassini-Huygens [260]
November 8 2004 / October 28, 2004		S/2004 S 6		Saturn	Porco et al. / Cassini-Huygens [261]
Date	Name	Designation	Image	Planet/Number Designation	References/Notes
January 5 2005 / October 21, 2003		Template:Mpl		Sol X?	Brown, Trujillo and Rabinowitz [262] Template:Mp's status as a planet has not yet been decided upon by the I.A.U.
May 4, 2005 / December 12, 2004		S/2004 S 7		Saturn	Sheppard, Jewitt, Kleyna, Marsden [263] [264] [265] [266]
		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
May 4, 2005 / December 13, 2004		S/2004 S 16		Saturn	Sheppard, Jewitt, Kleyna, Marsden [267] [268] [269] [270]
		S/2004 S 17
		S/2004 S 18
May 6 2005 / May 1, 2005	Daphnis	S/2005 S 1		Saturn XXXV	Porco et al. / Cassini-Huygens [271]
September 10 2005		S/2005 (2003 UB313) 1			Brown, van Dam, Bouchez, Le Mignant, Campbell, Chin, Conrad, Hartman, Johansson, Lafon, Rabinowitz, Stomski, Summers, Trujillo, and Wizinowich [272]
October 31, 2005/ May 15, 2005 / June 15, 2005		S/2005 P 1		Pluto	Weaver, Stern, Mutchler, Steffl, Buie, Merline, Spencer, Young, Young [273]
		S/2005 P 2
Date	Name	Designation	Image	Planet/Number Designation	References/Notes

Spurious Satellites

Date	Name	Designation	Image	Planet/Number Designation	References/Notes
1672	"Neith"			Venus (spurious)	Cassini [274]
April, 1861	"Chiron"			"Saturn IX" (spurious)	Goldschmidt [275]
April 28, 1905 / April 17, 1904	"Themis"			"Saturn X" (spurious)	Pickering [276] [277]
March 27 1974	"Charley"(informally)	S/1974 H 1		Mercury (spurious)	? [278]

External links

• City of Hudson's Natural Satellite Page
• Gazetteer of Planetary Nomenclature
• Scott Sheppard's Giant Planet Satellite Page
• JPL Natural Satellite Discovery Data
• When Did the asteroids Become Minor Planets?

--Angel 15:41, 27 May 2006 (CDT)