Distance O_Period Radius Mass Rotate Name # Orbits (000 km) (days) Incl Eccen Discoverer Date (km) (kg) Dens Abo Vo (days) Tilt --------- ---- ------- -------- -------- ----- ----- ---------- ---- ------- ------- ---- --- ----- ------ ---- Sun - - - - - - - - 695000 1.99e30 1.41 ? -26. 24.6 - Mercury I Sun 57910 87.97 7.00 0.21 - - 2439 3.30e23 5.42 .10 -1.9 58.6 7 Venus II Sun 108200 224.70 3.39 0.01 - - 6052 4.87e24 5.25 .65 -4.4 -243 177 Earth III Sun 149600 365.26 0.00 0.02 - - 6378 5.98e24 5.52 .37 - 0.99 23 Mars IV Sun 227940 686.98 1.85 0.09 - - 3397 6.42e23 3.94 .15 -2.0 1.03 25 Jupiter V Sun 778330 4332.71 1.31 0.05 - - 71492 1.90e27 1.33 .52 -2.7 0.41 3 Saturn VI Sun 1429400 10759.50 2.49 0.06 - - 60268 5.69e26 0.69 .47 0.7 0.45 27 Uranus VII Sun 2870990 30685.00 0.77 0.05 Herschel 1781 25559 8.69e25 1.27 .51 5.5 -0.72 98 Neptune VIII Sun 4504300 60190.00 1.77 0.01 Adams 1846 24764 1.02e26 1.64 .41 7.8 0.67 30 Pluto IX Sun 5913520 90800 17.15 0.25 Tombaugh 1930 1160 1.32e22 2.02 .3 15.1 -6.39 118 Moon I Earth 384 27.32 23.50 0.05 - - 1738 7.35e22 3.34 .12 -12.7 S - Phobos I Mars 9 0.32 1.00 0.01 Hall 1877 11 1.08e16 2.0 .06 11.3 S - Deimos II Mars 23 1.26 1.80 0.00 Hall 1877 6 1.80e15 1.7 .07 12.3 S - Metis XVI Jupiter 128 0.29 0.00 0.00 Synnott 1979 20 9.56e16 2.8 .05 17.5 ? - Adrastea XV Jupiter 129 0.30 0.00 0.00 Jewitt - 10 1.91e16 4.5 .05 18.7 ? - Amalthea V Jupiter 181 0.50 0.40 0.00 Barnard 1892 94 7.17e18 1.8 .05 14.1 S - Thebe XIV Jupiter 222 0.67 0.80 0.02 Synnott 1979 50 7.77e17 1.5 .05 16.0 S - Io I Jupiter 422 1.77 0.04 0.00 Galileo 1610 1815 8.94e22 3.55 .61 5.0 S - Europa II Jupiter 671 3.55 0.47 0.01 Galileo 1610 1569 4.80e22 3.01 .64 5.3 S - Ganymede III Jupiter 1070 7.15 0.19 0.00 Galileo 1610 2631 1.48e23 1.95 .42 4.6 S - Callisto IV Jupiter 1883 16.69 0.28 0.01 Galileo 1610 2400 1.08e23 1.86 .20 5.6 S - Leda XIII Jupiter 11094 238.72 27.00 0.15 Kowal 1974 8 5.68e15 2.7 ? 20.2 ? - Himalia VI Jupiter 11480 250.57 28.00 0.16 Perrine 1904 93 9.56e18 2.8 ? 15.0 0.4 - Lysithea X Jupiter 11720 259.22 29.00 0.11 Nicholson 1938 18 7.77e16 3.1 ? 18.2 ? - Elara VII Jupiter 11737 259.65 28.00 0.21 Perrine 1905 38 7.77e17 3.3 ? 16.6 0.5 - Ananke XII Jupiter 21200 -631 147.00 0.17 Nicholson 1951 15 3.82e16 2.7 ? 18.9 ? - Carme XI Jupiter 22600 -692 163.00 0.21 Nicholson 1938 20 9.56e16 2.8 ? 17.9 ? - Pasiphae VIII Jupiter 23500 -735 147.00 0.38 Melotte 1908 25 1.91e17 2.9 ? 16.9 ? - Sinope IX Jupiter 23700 -758 153.00 0.28 Nicholson 1914 18 7.77e16 3.1 ? 18.0 ? - Pan XVIII Saturn 134 0.58 0.00 0.00 Showalter 1990 10 ? ? .5 ? ? - Atlas XV Saturn 138 0.60 0.00 0.00 Terrile 1980 15 ? ? .9 18.0 ? - Prometheus XVI Saturn 139 0.61 0.00 0.00 Collins(3) 1980 46 2.70e17 0.7 .6 15.8 ? - Pandora XVII Saturn 142 0.63 0.00 0.00 Collins(3) 1980 42 2.20e17 0.7 .9 16.5 ? - Epimetheus XI Saturn 151 0.69 0.34 0.01 Walker(8) 1980 57 5.60e17 0.7 .8 15.7 S - Janus X Saturn 151 0.69 0.14 0.01 Dollfus(8) 1966 89 2.01e18 0.67 .8 14.5 S - Mimas I Saturn 186 0.94 1.53 0.02 Herschel 1789 196 3.80e19 1.17 .5 12.9 S - Enceladus II Saturn 238 1.37 0.02 0.00 Herschel 1789 250 8.40e19 1.24 .99 11.7 S - Tethys III Saturn 295 1.89 1.09 0.00 Cassini 1684 530 7.55e20 1.21 .9 10.2 S - Telesto XIII Saturn 295 1.89 0.00 0.00 Reitsema(6) 1980 15 ? ? .5 18.7 ? - Calypso XIV Saturn 295 1.89 0.00 0.00 Pascu(7) 1980 13 ? ? .6 19.0 ? - Dione IV Saturn 377 2.74 0.02 0.00 Cassini 1684 560 1.05e21 1.43 .7 10.4 S - Helene XII Saturn 377 2.74 0.20 0.01 Laques(4) 1980 16 ? ? .7 18.4 ? - Rhea V Saturn 527 4.52 0.35 0.00 Cassini 1672 765 2.49e21 1.33 .7 9.7 S - Titan VI Saturn 1222 15.95 0.33 0.03 Huygens 1655 2575 1.35e23 1.88 .21 8.3 S - Hyperion VII Saturn 1481 21.28 0.43 0.10 Bond(5) 1848 143 1.77e19 1.4 .3 14.2 chaotic - Iapetus VIII Saturn 3561 79.33 14.72 0.03 Cassini 1671 730 1.88e21 1.21 .2 11.1 S - Phoebe IX Saturn 12952 -550.48 175.30 0.16 Pickering 1898 110 4.00e18 0.7 .06 16.5 0.4 - Cordelia VI Uranus 50 0.34 0.14 0.00 Voyager2 1986 13 ? ? .07 24.0 ? - Ophelia VII Uranus 54 0.38 0.09 0.00 Voyager2 1986 16 ? ? .07 24.0 ? - Bianca VIII Uranus 59 0.43 0.16 0.00 Voyager2 1986 22 ? ? .07 23.0 ? - Cressida IX Uranus 62 0.46 0.04 0.00 Voyager2 1986 33 ? ? .07 22.0 ? - Desdemona X Uranus 63 0.47 0.16 0.00 Voyager2 1986 29 ? ? .07 22.0 ? - Juliet XI Uranus 64 0.49 0.06 0.00 Voyager2 1986 42 ? ? .07 22.0 ? - Portia XII Uranus 66 0.51 0.09 0.00 Voyager2 1986 55 ? ? .07 21.0 ? - Rosalind XIII Uranus 70 0.56 0.28 0.00 Voyager2 1986 27 ? ? .07 22.0 ? - Belinda XIV Uranus 75 0.62 0.03 0.00 Voyager2 1986 34 ? ? .07 22.0 ? - Puck XV Uranus 86 0.76 0.31 0.00 Voyager2 1985 77 ? ? .07 20.0 ? - Miranda V Uranus 130 1.41 4.22 0.00 Kuiper 1948 236 6.30e19 1.15 .27 16.5 S - Ariel I Uranus 191 2.52 0.00 0.00 Lassell 1851 579 1.27e21 1.56 .34 14.4 S - Umbriel II Uranus 266 4.14 0.00 0.00 Lassell 1851 585 1.27e21 1.52 .18 15.3 S - Titania III Uranus 436 8.71 0.00 0.00 Herschel 1787 789 3.49e21 1.70 .27 14.0 S - Oberon IV Uranus 583 13.46 0.00 0.00 Herschel 1787 761 3.03e21 1.64 .24 14.2 S - Naiad III Neptune 48 0.29 0.00 0.00 Voyager2 1989 29 ? ? .06 25.0 ? - Thalassa IV Neptune 50 0.31 4.50 0.00 Voyager2 1989 40 ? ? .06 24.0 ? - Despina V Neptune 53 0.33 0.00 0.00 Voyager2 1989 74 ? ? .06 23.0 ? - Galatea VI Neptune 62 0.43 0.00 0.00 Voyager2 1989 79 ? ? .06 23.0 ? - Larissa VII Neptune 74 0.55 0.00 0.00 Voyager2 1989 96 ? ? .06 21.0 ? - Proteus VIII Neptune 118 1.12 0.00 0.00 Voyager2 1989 209 ? ? .06 20.0 ? - Triton I Neptune 355 -5.88 157.00 0.00 Lassell 1846 1350 2.14e22 2.0 .7 13.6 S - Nereid II Neptune 5513 360.13 29.00 0.75 Kuiper 1949 170 ? ? .2 18.7 ? - Charon I Pluto 20 6.39 98.80 0.00 Christy 1978 635 1.47e21 1.37 .5 16.8 S - Key: Orbits Sun or planet about which it orbits. Distance Mean distance (semimajor axis) to the Sun or to planet center x1000 km. Date Year discovered. O_Period Sidereal period of orbit in days (negative=retrograde). Incl Orbital inclination. Eccen Orbital eccentricity. Radius Equatorial radius in km. Mass in kilograms including atmospheres but not satellites. Dens Density in g/cm3. Abo Object's geometric albedo. Vo Object's magnitude in visible light at opposition. Rotate Sidereal period of equatorial rotation in days (negative=retrograde; S=synchronous).