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Earth

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Moon	1737.10	384.399	27.321582	prehistoric	—

Mars

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Phobos	11.1 ± 0.15	9.380	0.319	1877	Hall
II	Deimos	6.2 ± 0.18	23.460	1.262	1877	Hall

Jupiter

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Io	1818.1 ± 0.1	421.800	1.769	1610	Galileo
II	Europa	1560.7 ± 0.7	671.100	3.551	1610	Galileo
III	Ganymede	2634.1 ± 0.3	1.070.400	7.155	1610	Galileo
IV	Callisto	2408.4 ± 0.3	1.882.700	16.69	1610	Galileo
V	Amalthea	83.45 ± 2.4	181.400	0.498	1892	Barnard
VI	Himalia	67 ± 10	11.461.000	250.56	1904	Perrine
VII	Elara	43	11.741.000	259.64	1905	Perrine
VIII	Pasiphae	30	23.624.000	743.63 (r)	1908	Melotte
IX	Sinope	19	23.939.000	758.90 (r)	1914	Nicholson
X	Lysithea	18	11.717.000	259.20	1938	Nicholson
XI	Carme	23	23.404.000	734.17 (r)	1938	Nicholson
XII	Ananke	14	21.276.000	629.77 (r)	1951	Nicholson
XIII	Leda	10	11.165.000	240.92	1974	Kowal
XIV	Thebe	49.3 ± 2.0	221.900	0.675	1979	Synnott (Voyager 1)
XV	Adrastea	8.2 ± 2.0	129.000	0.298	1979	Jewitt. Danielson (Voyager 1)
XVI	Metis	21.5 ± 2.0	128.000	0.295	1979	Synnott (Voyager 1)
XVII	Callirrhoe	4.3	24.103.000	758.77 (r)	2000	Scotti. Spahr. McMillan. Larsen. Montani. Gleason. Gehrels
XVIII	Themisto	4.0	7.284.000	130.02	1975/2000	Kowal and Roemer (original); Sheppard. Jewitt. Fernández. Magnier (rediscovery)
XIX	Megaclite	2.7	23.493.000	752.86 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XX	Taygete	2.5	23.280.000	732.41 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XXI	Chaldene	1.9	23.100.000	723.72 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XXII	Harpalyke	2.2	20.858.000	623.32 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XXIII	Kalyke	2.6	23.483.000	742.06 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XXIV	Iocaste	2.6	21.060.000	631.60 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XXV	Erinome	1.6	23.196.000	728.46 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XXVI	Isonoe	1.9	23.155.000	726.23 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XXVII	Praxidike	3.4	20.908.000	625.39 (r)	2000	Sheppard. Jewitt. Fernández. Magnier. Dahm. Evans
XXVIII	Autonoe	2.0	24.046.000	760.95 (r)	2001	Sheppard. Jewitt. Kleyna
XXIX	Thyone	2.0	20.939.000	627.21 (r)	2001	Sheppard. Jewitt. Kleyna
XXX	Hermippe	2.0	21.131.000	633.9 (r)	2001	Sheppard. Jewitt. Kleyna
XXXI	Aitne	1.5	23.229.000	730.18 (r)	2001	Sheppard. Jewitt. Kleyna
XXXII	Eurydome	1.5	22.865.000	717.33 (r)	2001	Sheppard. Jewitt. Kleyna
XXXIII	Euanthe	1.5	20.797.000	620.49 (r)	2001	Sheppard. Jewitt. Kleyna
XXXIV	Euporie	1.0	19.304.000	550.74 (r)	2001	Sheppard. Jewitt. Kleyna
XXXV	Orthosie	1.0	20.720.000	622.56 (r)	2001	Sheppard. Jewitt. Kleyna
XXXVI	Sponde	1.0	23.487.000	748.34 (r)	2001	Sheppard. Jewitt. Kleyna
XXXVII	Kale	1.0	23.217.000	729.47 (r)	2001	Sheppard. Jewitt. Kleyna
XXXVIII	Pasithee	1.0	23.004.000	719.44 (r)	2001	Sheppard. Jewitt. Kleyna
XXXIX	Hegemone	1.5	23.577.000	739.88 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández
XL	Mneme	1.0	21.035.000	620.04 (r)	2003	Gladman. Allen
XLI	Aoede	2.0	23.980.000	761.50 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández. Hsieh
XLII	Thelxinoe	1.0	21.164.000	628.09 (r)	2003	Sheppard. Jewitt. Kleyna. Gladman. Kavelaars. Petit. Allen
XLIII	Arche	1.5	23.355.000	731.95 (r)	2002	Sheppard. Meech. Hsieh. Tholen. Tonry
XLIV	Kallichore	1.0	23.288.000	728.73 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández
XLV	Helike	2.0	21.069.000	626.32 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández. Hsieh
XLVI	Carpo	1.5	17.058.000	456.30	2003	Sheppard. Gladman. Kavelaars. Petit. Allen. Jewitt. Kleyna
XLVII	Eukelade	2.0	23.328.000	730.47 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández. Hsieh
XLVIII	Cyllene	1.0	23.809.000	752 (r)	2003	Sheppard. Jewitt. Kleyna
XLIX	Kore	1.0	24.543.000	779.17 (r)	2003	Sheppard. Jewitt. Kleyna
L	Herse	1.0	22.983.000	714.51 (r)	2003	Gladman. Sheppard. Jewitt. Kleyna. Kavelaars. Petit. Allen
LI	S/2010 J 1	1.0	23.314.335	723.2 (r)	2010	Jacobson. Brozović. Gladman. Alexandersen
LII	S/2010 J 2	0.5	20.307.150	588.1 (r)	2010	Veillet
LIII	Dia	2.0	12.570.000	287.93	2001	Sheppard. Jewitt. Kleyna. Fernández. Hsieh
LIV	S/2016 J 1	3.0	20.595.480	602.7 (r)	2016	Sheppard
LV	S/2003 J 18	1.0	20.426.000	596.58 (r)	2003	Gladman. Sheppard. Jewitt. Kleyna. Kavelaars. Petit. Allen
LVI	S/2011 J 2	0.5	23.329.710	726.8 (r)	2011	Sheppard
LVII	S/2003 J 5	2.0	23.498.000	738.74 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández. Hsieh
LVIII	S/2003 J 15	1.0	22.630.000	689.77 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández
LIX	S/2017 J 1	2.0	23.483.978	734.2 (r)	2017	Sheppard
LX	S/2003 J 3	1.0	20.224.000	583.88 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández. Hsieh
—	S/2003 J 2	1.0	28.455.000	981.55 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández. Hsieh
—	S/2003 J 4	1.0	23.933.000	755.26 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández. Hsieh
—	S/2003 J 9	0.5	23.388.000	733.30 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández
—	S/2003 J 10	1.0	23.044.000	716.25 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández
—	S/2003 J 12	0.5	17.833.000	489.72 (r)	2003	Sheppard. Jewitt. Kleyna. Fernández
—	S/2003 J 16	1.0	20.956.000	616.33 (r)	2003	Gladman. Sheppard. Jewitt. Kleyna. Kavelaars. Petit. Allen
—	S/2003 J 19	1.0	23.535.000	740.43 (r)	2003	Gladman. Sheppard. Jewitt. Kleyna. Kavelaars. Petit. Allen
—	S/2003 J 23	1.0	23.566.000	732.45 (r)	2004	Sheppard. Jewitt. Kleyna. Fernández
—	S/2011 J 1	0.5	20.155.290	580.7 (r)	2011	Sheppard

Saturn

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Mimas	198.2 ± 0.4	185.540	0.942	1789	Herschel
II	Enceladus	252.3 ± 0.6	238.040	1.370	1789	Herschel
III	Tethys	536.3 ± 1.5	294.670	1.888	1684	Cassini
IV	Dione	562.5 ± 1.5	377.420	2.737	1684	Cassini
V	Rhea	764.5 ± 2.0	527.070	4.518	1672	Cassini
VI	Titan	2575.5 ± 2.0	1.221.870	15.95	1655	Huygens
VII	Hyperion	133.0 ± 8.0	1.500.880	21.28	1848	W.Bond. G. Bond. and Lassell
VIII	Iapetus	734.5 ± 4.0	3.560.840	79.33	1671	Cassini
IX	Phoebe	106.6 ± 1.1	12.947.780	550.31 (r)	1899	Pickering
X	Janus	90.4 ± 3.0	151.460	0.695	1966	Dollfus
XI	Epimetheus	58.3 ± 3.1	151.410	0.694	1980	Walker
XII	Helene	16 ± 4	377.420	2.737	1980	Laques. Lecacheux
XIII	Telesto	12 ± 3	294.710	1.888	1980	Smith. Reitsema. Larson. Fountain (Voyager 1)
XIV	Calypso	9.5 ± 1.5	294.710	1.888	1980	Pascu. Seidelmann. Baum. Currie
XV	Atlas	15.3 ± 1.2	137.670	0.602	1980	Terrile (Voyager 1)
XVI	Prometheus	46.8 ± 5.6	139.380	0.613	1980	Collins (Voyager 1)
XVII	Pandora	40.6 ± 4.5	141.720	0.629	1980	Collins (Voyager 1)
XVIII	Pan	12.8	133.580	0.575	1990	Showalter (Voyager 2)
XIX	Ymir	9	23.140.400	1.315.58 (r)	2000	Gladman
XX	Paaliaq	11	15.200.000	686.95	2000	Gladman
XXI	Tarvos	7.5	17.983.000	926.23	2000	Gladman. Kavelaars
XXII	Ijiraq	6	11.124.000	451.42	2000	Gladman. Kavelaars
XXIII	Suttungr	3.5	19.459.000	1.016.67 (r)	2000	Gladman. Kavelaars
XXIV	Kiviuq	8	11.110.000	449.22	2000	Gladman
XXV	Mundilfari	3.5	18.628.000	952.77 (r)	2000	Gladman. Kavelaars
XXVI	Albiorix	16	16.182.000	783.45	2000	Holman. Spahr
XXVII	Skathi	4	15.540.000	728.20 (r)	2000	Gladman. Kavelaars
XXVIII	Erriapus	5	17.343.000	871.19	2000	Gladman. Kavelaars
XXIX	Siarnaq	20	18.015.400	896.44	2000	Gladman. Kavelaars
XXX	Thrymr	3.5	20.314.000	1.094.11 (r)	2000	Gladman. Kavelaars
XXXI	Narvi	3.5	19.007.000	1.003.86 (r)	2003	Sheppard. Jewitt. Kleyna
XXXII	Methone	1.6	194.440	1.010	2004	Porco. Charnoz. Brahic. Dones (Cassini–Huygens)
XXXIII	Pallene	2	212.280	1.154	2004	Gordon. Murray. Beurle. et al. (Cassini–Huygens)
XXXIV	Polydeuces	1.25	377.200	2.737	2004	Porco et al. (Cassini–Huygens)
XXXV	Daphnis	3–4	136.500	0.594	2005	Porco et al. (Cassini–Huygens)
XXXVI	Aegir	3	20.751.000	1.117.52 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
XXXVII	Bebhionn	3	17.119.000	834.84	2004	Sheppard. Jewitt. Kleyna. Marsden
XXXVIII	Bergelmir	3	19.336.000	1.005.74 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
XXXIX	Bestla	3.5	20.192.000	1.088.72 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
XL	Farbauti	2.5	20.377.000	1.085.55 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
XLI	Fenrir	2	22.454.000	1.260.35 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
XLII	Fornjot	3	25.146.000	1.494.2 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
XLIII	Hati	3	19.846.000	1.038.61 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
XLIV	Hyrrokkin	4	18.437.000	931.86 (r)	2006	Sheppard. Jewitt. Kleyna
XLV	Kari	3.5	22.089.000	1.230.97 (r)	2006	Sheppard. Jewitt. Kleyna
XLVI	Loge	3	23.058.000	1.311.36 (r)	2006	Sheppard. Jewitt. Kleyna
XLVII	Skoll	3	17.665.000	878.29 (r)	2006	Sheppard. Jewitt. Kleyna
XLVIII	Surtur	3	22.704.000	1.297.36 (r)	2006	Sheppard. Jewitt. Kleyna
XLIX	Anthe	1	197.700	1.0365	2007	Porco et al. (Cassini–Huygens)
L	Jarnsaxa	3	18.811.000	964.74 (r)	2006	Sheppard. Jewitt. Kleyna
LI	Greip	3	18.206.000	921.19 (r)	2006	Sheppard. Jewitt. Kleyna
LII	Tarqeq	3.5	18.009.000	887.48	2007	Sheppard. Jewitt. Kleyna
LIII	Aegaeon	0.25	167.500	0.808	2008	Cassini Imaging Science Team Cassini–Huygens
—	S/2004 S 7	3	20.999.000	1.140.24 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
—	S/2004 S 12	2.5	19.878.000	1.046.19 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
—	S/2004 S 13	3	18.404.000	933.48 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
—	S/2004 S 17	2	19.447.000	1.014.70 (r)	2004	Sheppard. Jewitt. Kleyna. Marsden
—	S/2006 S 1	3	18.790.000	963.37 (r)	2006	Sheppard. Jewitt. Kleyna
—	S/2006 S 3	3	22.096.000	1.227.21 (r)	2006	Sheppard. Jewitt. Kleyna
—	S/2007 S 2	3	16.725.000	808.08 (r)	2007	Sheppard. Jewitt. Kleyna
—	S/2007 S 3	3	18.975.000	977.8 (r)	2007	Sheppard. Jewitt. Kleyna
—	S/2009 S 1	0.15	117.000	0.471	2009	Cassini Imaging Science Team Cassini–Huygens

Uranus

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Ariel	578.9 ± 0.6	190.900	2.520	1851	Lassell
II	Umbriel	584.7 ± 2.8	266.000	4.144	1851	Lassell
III	Titania	788.9 ± 1.8	436.300	8.706	1787	Herschel
IV	Oberon	761.4 ± 2.6	583.500	13.46	1787	Herschel
V	Miranda	235.8 ± 0.7	129.900	1.413	1948	Kuiper
VI	Cordelia	20.1 ± 3	49.800	0.335	1986	Terrile (Voyager 2)
VII	Ophelia	21.4 ± 4	53.800	0.376	1986	Terrile (Voyager 2)
VIII	Bianca	25.7 ± 2	59.200	0.435	1986	Smith (Voyager 2)
IX	Cressida	39.8 ± 2	61.800	0.464	1986	Synnott (Voyager 2)
X	Desdemona	32.0 ± 4	62.700	0.474	1986	Synnott (Voyager 2)
XI	Juliet	46.8 ± 4	64.400	0.493	1986	Synnott (Voyager 2)
XII	Portia	67.6 ± 4	66.100	0.513	1986	Synnott (Voyager 2)
XIII	Rosalind	36 ± 6	69.900	0.558	1986	Synnott (Voyager 2)
XIV	Belinda	40.3 ± 8	75.300	0.624	1986	Synnott (Voyager 2)
XV	Puck	81 ± 2	86.000	0.762	1985	Synnott (Voyager 2)
XVI	Caliban	49	7.231.100	579.73 (r)	1997	Gladman. Nicholson. Burns. Kavelaars
XVII	Sycorax	75	12.179.400	1.288.38 (r)	1997	Gladman. Nicholson. Burns. Kavelaars
XVIII	Prospero	25	16.256.000	1.978.29 (r)	1999	Gladman. Holman. Kavelaars. Petit. Scholl
XIX	Setebos	24	17.418.000	2.225.21 (r)	1999	Gladman. Holman. Kavelaars. Petit. Scholl
XX	Stephano	10	8.004.000	677.36 (r)	1999	Gladman. Holman. Kavelaars. Petit. Scholl
XXI	Trinculo	5	8.504.000	749.24 (r)	2001	Holman. Kavelaars. Milisavljevic
XXII	Francisco	6	4.276.000	266.56 (r)	2001	Holman. Kavelaars. Milisavljevic. Gladman
XXIII	Margaret	5.5	14.345.000	1.687.01	2003	Sheppard. Jewitt
XXIV	Ferdinand	6	20.901.000	2.887.21 (r)	2001	Holman. Kavelaars. Milisavljevic. et al.
XXV	Perdita	10	76.417	0.638	1986	Karkoschka (Voyager 2)
XXVI	Mab	5	97.736	0.923	2003	Showalter. Lissauer
XXVII	Cupid	5	74.392	0.613	2003	Showalter. Lissauer

Neptune

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Triton	1353.4 ± 0.9	354.800	5.877 (r)	1846	Lassell
II	Nereid	170 ± 25	5.513.820	360.14	1949	Kuiper
III	Naiad	33 ± 3	48.227	0.294	1989	Terrile (Voyager 2)
IV	Thalassa	41 ± 3	50.075	0.311	1989	Terrile (Voyager 2)
V	Despina	75 ± 3	52.526	0.335	1989	Synnott (Voyager 2)
VI	Galatea	88 ± 4	61.953	0.429	1989	Synnott (Voyager 2)
VII	Larissa	97 ± 3	73.548	0.555	1982	Reitsema. Hubbard. Lebofsky. Tholen (Voyager 2)
VIII	Proteus	210 ± 7	117.647	1.122	1989	Synnott (Voyager 2)
IX	Halimede	31	15.728.000	1.879.71 (r)	2002	Holman. Kavelaars. Grav. Fraser. Milisavljevic
X	Psamathe	20	46.695.000	9.115.91 (r)	2003	Jewitt. Kleyna. Sheppard. Holman. Kavelaars
XI	Sao	22	22.422.000	2.914.07	2002	Holman. Kavelaars. Grav. Fraser. Milisavljevic
XII	Laomedeia	21	23.571.000	3.167.85	2002	Holman. Kavelaars. Grav. Fraser. Milisavljevic
XIII	Neso	30	48.387.000	9.373.99 (r)	2002	Holman. Kavelaars. Grav. Fraser. Milisavljevic
—	S/2004 N 1	8–10	105.283	0.9362	2013	Showalter et al.

Pluto

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Charon	603.6 ± 1.4	19.591	6.387	1978	Christy
II	Nix	23.0 ± 2	48.671	24.85	2005	Weaver. Stern. Buie. et al.
III	Hydra	30.5 ± 4	64.698	38.20	2005	Weaver. Stern. Buie. et al.
IV	Kerberos	14.0	57.729	32.17	2011	Showalter (Hubble)
V	Styx	10.0	42.393	20.16	2012	Showalter (Hubble)

Haumea

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Hiʻiaka	~160	49.500 ± 400	49.12 ± 0.03	2005	Brown et al.
II	Namaka	~85	39.000 (r)	34.7 ± 0.1	2005	Brown et al.

Makemake (Easterbunny)

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
—	S/2015 (136472) 1	~80			2016	Parker et al.

Eris

Numeral	Name	Mean radius [km]	Semi-major axis [km]	Sidereal period (r = retrograde)	Discovery year	Discovered by
I	Dysnomia	257 ± 110	37.370 ± 150	15.774 ± 0.002	2005	Brown. Rabinowitz. Trujillo et al.

Some facts

Satellite is a celestial body, that circulates around the planet, dwarf planet or planetoid.
Depending on the origin, we talk about natural satellites (e.g. the moon of the Earth) or artificial satellites (e.g. Sputnik 1).
Natural satellites are commonly called moons.
In order for a body to become a satellite of a given planet, it should be given a speed of at least as much as the first space speed:

$v_I = \sqrt{\frac{GM}{R}}$
where:
- G - gravitional constant,
- M - mass of the planet,
- R - planet radius.
Earth has only one natural satellite simply called The Moon. However, there are planets that have more natural satellites, e.g. as many as 27 moons of Uranus have been discovered.

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