Saturn's moons

Updated October 19, 2026 · 4 min read

Saturn has 274 confirmed moons, more than any other planet, after 128 new ones were announced in March 2025. They range from Titan, a world larger than Mercury with a thick atmosphere and seas of liquid methane, down to captured fragments only a few kilometers across. Together they form the most varied satellite system in the solar system, and two of them, Titan and Enceladus, are among the best places to look for conditions suitable for life.

How the system is organized

Saturn's moons fall into a few natural families, defined by where they orbit and how they got there. The full count and its history are on how many moons Saturn has; a data table of the notable ones is in the list of Saturn's moons.

Ring moons and shepherds

Closest in are small moons embedded in or skirting the rings. Pan and Daphnis orbit inside gaps in the A ring and keep them open; Atlas skims the A ring's outer edge; Prometheus and Pandora flank the narrow F ring. Just beyond, Janus and Epimetheus share almost the same orbit and swap places every four years. These bodies are porous, often strangely shaped, and sculpt the ring material around them (see shepherd moons).

The mid-sized icy moons

Five round, icy moons orbit between about 185,000 and 530,000 km from Saturn: Mimas, Enceladus, Tethys, Dione and Rhea. They are made mostly of water ice with varying amounts of rock, and they are locked in a web of orbital resonances: Mimas with Tethys, Enceladus with Dione. Those resonances keep their orbits slightly eccentric, which flexes their interiors and generates heat. That tidal heating explains why little Enceladus is geologically alive, and why Mimas, long assumed to be a frozen ball, may hide a young ocean.

Tethys and Dione each have two small "Trojan" companions sharing their orbits, 60 degrees ahead and behind (Trojan moons). Between Mimas and Enceladus sit three tiny moons, Methone, Anthe and Pallene, each tied to a faint ring arc (Alkyonides).

Titan, Hyperion and Iapetus

Farther out, Titan dominates the system at 1.22 million km from Saturn. It is the only moon in the solar system with a dense atmosphere, and the only body besides Earth known to have stable liquid on its surface, in the form of methane and ethane lakes. Its gravity shapes its neighbors: Hyperion, a porous, sponge-like body, is held in a 4:3 resonance with Titan and tumbles chaotically. Beyond them lies Iapetus, with one hemisphere as dark as coal and the other as bright as snow, plus a mountain ridge running along its equator.

The irregular moons

The overwhelming majority of Saturn's moons, well over 200, are irregular satellites: small bodies on distant, tilted, often retrograde orbits millions of kilometers from the planet. They are almost certainly captured objects or the debris of collisions between captured objects. Astronomers sort them into the Inuit, Gallic and Norse groups, named after the mythologies used for their names (irregular moons). The largest is Phoebe, about 213 km across, which orbits backward and sheds dust into the enormous Phoebe ring.

Names: from Titans to giants

The seven moons known by the mid-19th century were named by John Herschel in 1847, after the Titans and Titanesses, the siblings of Cronus (the Greek counterpart of Saturn; see Saturn's mythological family). Later regular moons kept Greco-Roman names, while the irregular moons draw on Inuit, Gallic (Celtic) and Norse giants. Many recent discoveries still carry only provisional designations such as S/2004 S 24, and the International Astronomical Union names them gradually.

Why these moons matter

Saturn's moons are a natural laboratory. Enceladus sprays its own ocean into space through geysers, letting a spacecraft sample it without landing; Cassini detected salts, organic molecules, molecular hydrogen and, in 2023, phosphates in that material. Titan's chemistry, driven by sunlight in a nitrogen-methane atmosphere, produces complex organic molecules. Both moons are discussed in life on Titan and Enceladus.

Nearly everything we know in detail comes from the Cassini-Huygens mission (2004–2017), which made more than 120 targeted flybys of Titan and repeated close passes of the icy moons, and from the Huygens probe, which landed on Titan on 14 January 2005. The next chapter is NASA's Dragonfly rotorcraft, due to reach Titan in 2034.

Sources

• NASA Science: Saturn's moons
• JPL Solar System Dynamics: planetary satellite physical parameters
• NASA: Cassini mission
• John Herschel, Results of Astronomical Observations made at the Cape of Good Hope (1847)