Saturn has over 60 moons known so far and many more smaller units composing the rings. 34 of Saturn's moons are smaller than 10 km in diameter, while other 13 were less than 50 km in diameter. Astronomers think, that 3 celestial bodies are satellites of the gas giant, but they suspect the objects are just large formations of dust in the rings of the planet.
Mimas is composed mainly of ice and some rock. Due to the proximity of Saturn, Mimas is a subject of strong tidal forces, which shape the moon in ellipsoid form. Mimas is the smallest known celestial body in our solar system, which has rounded shape because of its own gravity. Diameter of 397 km, mass 3.84 × 1019, an average orbital radius of 185 404 km and orbital period of 22 hours 37 minutes and 5 seconds.
Enceladus is the sixth largest moon of Saturn. The satellite is covered with water and ice reflects nearly 100% of the sunlight reaching its lunar surface. Enceladus is in a 1:2 orbital resonance with Dione and is known with the volcanic activity and geysers around its south pole. Diameter of 499 km, mass 8.6 × 1019, an average orbital radius of 237 948 km and orbital period of 32 hours 53 minutes and 7 seconds.
Tethys is made up almost entirely of water ice. On the surface of the satellite are observed craters, cracks and faults in the ice. Diameter of 1060 km, mass 6.2 × 1020, an average orbital radius of 294 km and orbital period of 45 hours 18 minutes and 26 seconds.
Dione is composed of water ice, but it is the third in density among the satellites of Saturn. Astronomers suggest that is because of the dense materials and silicate rocks hidden inside the moon. Diameter of 1120 km, mass of 1.096 × 1021, an average orbital radius of 377 396 km and orbital period of 65 hours 41 minutes and 5 seconds.
Rhea is formed by 75% water ice and 25% rock masses. According to a discovery from 2008, Rhea is the only known moon with rings around it. NASA has found three rings of debris and dust with high density around the moon. Diameter of 1528 km, mass 2.3166 × 1021, an average orbital radius of 527 108 km and orbital period of 4 days 12 hours and 25 minutes.
Titan is the largest satellite of Saturn and the only one in the solar system with a dense atmosphere. Moon ranks among the most massive objects in the solar system after the Sun, the eight planets and the moon of Jupiter - Ganymede. Titan concentrates around 90% of the mass of matter around Saturn and its rings. Diameter of 5150 km, mass of 1.345 × 1023, an average orbital radius of 1 221 930 km and an orbital period of 15 days 22 hours and 41 minutes.
Iapetus is the third largest moon of Saturn. It is known with its unusually high equatorial ridge, over 7° inclination and the large radius of its orbit. Diameter of 1436 km, mass 1.9739 × 1021, an average orbital radius of 3 560 820 km and orbital period of 79 days 7 hours and 55 minutes.
Orbits of Saturn's moons and satellites around the gas giant. Outermost objects have an average orbital radius up to 60 times greater than the orbital radius of the Earth's moon.