Moons of Saturn


Moons of Saturn

Table
Moons of Saturn{1}
name numerical designation ****mean distance from
***centre of planet
***(orbital radius) orbital period (sidereal period; Earth days){5} inclination of orbit to planet's equator (degrees) eccentricity
of orbit rotation period (Earth days){7} radius or radial dimensions (km) mass (kg) mean* density (g/cm3)
00000km Saturn
radii0
Pan XVIII 133,583 2.216 0.575 about 0 about 0 10
Atlas XV 137,666 2.284 0.602 about 0 about 0 19 × 17 × 14
Prometheus XVI 139,377 2.313 0.613 0 0.0024 70 × 50 × 34
Pandora XVII 141,713 2.351 0.629 0 0.0042 55 × 44 × 31
Epimetheus{2} XI 151,415 2.512 0.694 0.34 0.009 sync. 69 × 55 × 55
Janus{2} X 151,417 2.512 0.695 0.14 0.007 sync. 99 × 96 × 76
Mimas I 185,520 3.078 0.942 1.53 0.0202 sync. 199 3.60 × 1019 1.10
Enceladus II 238,020 3.949 1.370 0.02 0.0045 sync. 249 8.53 × 1019 1.30
Telesto{3} XIII 294,600 4.888 1.888 about 0 about 0 15 × 13 × 8
Calypso{3} XIV 294,600 4.888 1.888 about 0 about 0 15 × 8 × 8
Tethys III 294,660 4.889 1.888 1.09 0.0000 sync. 530 6.03 × 1020 1.00
Dione IV 377,400 6.262 2.737 0.02 0.0022 sync. 560 1.12 × 1021 1.50
Helene{4} XII 377,400 6.262 2.737 0.2 0.005 16
Polydeuces{4} XXXIV 377,400 6.262 2.737 6.5
———————————————————————————————————————————————— known outer extent of ring system ————————————————————————————————————————————————
Rhea V 527,040 8.745 4.518 0.35 0.0010 sync. 764 2.46 × 1021 1.30
Titan VI 1,221,850 20.274 15.940 0.33 0.0292 sync. 2,575 1.35 × 1023 1.88
Hyperion VII 1,481,100 24.575 21.280 0.43 0.1042 chaotic 185 × 140 × 113   5.5 × 1018 0.50
Iapetus VIII 3,561,300 59.091 79.330 15{6} 0.0283 sync. 718 1.59 × 1021 1.00
Phoebe IX 12,952,000 214.907 550.4 R0 175.3 0.163 0.4 110   8.3 × 1018 1.60
{1}Beginning in 2000, about 40 additional moons were discovered with electronic detectors in Earth-based observations or in spacecraft images. Most have large orbital radii, eccentricities, and inclinations, and more than half have retrograde orbits. A small number orbit in a prograde direction within a few Saturn radii of the planet. Rough size estimates based on brightness place them between 3 and 20 km in radius. They were assigned provisional numerical designations on discovery; many have received official names.
{2}Co-orbital moons; certain values are variable owing to orbital exchange.
{3}"Trojan" moons: Telesto precedes Tethys in its orbit by 60°; Calypso follows Tethys by 60°.
{4}"Trojan" moons: Helene precedes Dione in its orbit by 60°; Polydeuces follows Dione by 60° on average, but with wide variations.
{5}R following the quantity indicates a retrograde orbit.
{6}Average value. The inclination oscillates about this value by 7.5° (plus or minus) over a 3,000-year period.
{7}Sync. = synchronous rotation; the rotation and orbital periods are the same.
See as table:

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Universalium. 2010.

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