♄ Saturn

How to follow Saturn live

The panel above recomputes Saturn every second in your browser: how far it is from the Sun and from Earth (in AU and in kilometers), its apparent magnitude, the illuminated fraction, the phase angle and the elongation from the Sun. The magnitude tells you at a glance whether Saturn is visible to the naked eye tonight or needs a telescope.

The top-down map of the Solar System then shows exactly where Saturn sits among the other planets right now. Run time with the day slider, zoom and pan, click a second planet to compare distances, or press "Next event" to jump to the next opposition or closest approach to Earth, the best moment to observe it.

Quick facts

About Saturn

Saturn is the second largest planet in the Solar System and the farthest one still visible to the naked eye. It is a gas giant made almost entirely of hydrogen and helium, with no ground to stand on, but what made it famous wraps around it: a ring system so wide and bright that it shows up even in backyard telescopes and draws a gasp from anyone who sees it for the first time.

The rings span roughly 280,000 km in radial extent from the innermost to the outermost orbit, yet the main sections are only tens to hundreds of metres thick. They are so thin relative to their diameter that, scaled down to the size of a sheet of paper, that sheet would need to be over 3 km wide. In 2025 the rings passed through their minimum tilt as seen from Earth, appearing nearly edge-on; by 2032 they will be wide open again.

Physical characteristics

About 120,500 km across at the equator, Saturn could fit nearly ten Earths side by side. Despite its size, it is the least dense planet of all: its average density is just 0.687 g/cm³, less than water (1 g/cm³). In other words, if there were an ocean large enough, Saturn would float.

It spins fast, a day lasting just over ten and a half hours, which visibly flattens the poles: the equatorial radius is nearly 10% larger than the polar radius, the greatest polar flattening of any planet. At the north pole sits a persistent hexagonal storm with sides roughly 14,500 km long, each larger than Earth's diameter, unique in the Solar System. The hexagonal cloud structure was first photographed by the Voyager probes in 1980 and studied in detail by Cassini between 2004 and 2017.

The rings: structure and origin

Saturn's rings are made of billions of chunks of ice and rock, ranging from sand grains to boulders several metres wide. They are divided into main groups labelled by letters: D, C, B, A (the most visible), and the outer F, G and E rings. The Cassini Division, a dark gap about 4,800 km wide between rings A and B, is visible through a medium-sized amateur telescope.

The origin of the rings is still debated. For decades the dominant view was that they were ancient leftovers from the planet's formation. Data from the Cassini mission, which ended in 2017, suggested the rings are relatively young, perhaps less than 400 million years old, possibly the remnants of a moon or comet torn apart by tidal forces. The rings are also slowly disappearing: material rains down onto Saturn at a rate that could empty them in 100 million years.

Orbit and the changing ring tilt as seen from Earth

Saturn orbits the Sun at about 9.5 astronomical units (roughly 1.4 billion km) and takes almost 29.5 years to go around once. Seen from Earth, it drifts slowly among the constellations, lingering in the same part of the sky for whole seasons.

Roughly once a year Earth overtakes it in the race around the Sun: this is opposition, when Saturn rises at dusk, stays up all night and shines brightest. The tilt of the rings as seen from Earth changes over the years because Saturn's axis is tilted 26.7° relative to its orbit. Roughly every 15 years the rings appear nearly edge-on and almost vanish, as happened in March 2025. Between 2025 and 2032 they will open progressively to their maximum inclination.

How to observe Saturn tonight

To the naked eye, Saturn looks like a calm, yellowish star that does not twinkle like real stars. It is more subdued than Jupiter or Venus, but unmistakable once you know where to look. Its golden-yellow tone sets it apart from the blue-white stars around it.

• Any telescope at 40x to 60x magnification already reveals the rings clearly enough to produce astonishment, one of the most memorable sights in amateur astronomy.
• With more magnification or a larger aperture you can make out the Cassini Division, the dark gap separating rings A and B, and also Titan, the largest moon, as a tiny dot close to the planet.
• When the rings are wide open, the planet's disc looks disproportionately small compared with the ring system, reinforcing the sensation that what you are seeing cannot be real.
• Astronomy apps such as Stellarium show the current ring tilt angle and where Saturn is in the sky tonight.

Moons: Titan, Enceladus and the rest

Saturn leads the Solar System in moon count: 274 are confirmed, including the 128 new ones discovered and announced in 2023. Titan, the largest, is the only other body in the Solar System with rivers, lakes and stable seas on the surface, but not of water: they are made of liquid methane and ethane. The Cassini-Huygens mission landed the Huygens probe on Titan in January 2005, the most distant landing from the Sun ever made; the camera sent back images of hydrocarbon-coated pebbles beside a dry channel.

Enceladus is an icy world hiding a saltwater ocean beneath its crust. It shoots jets of water vapour and ice particles from its south pole, spotted by Cassini in 2005. Those jets feed Saturn's E ring and contain complex organic molecules, placing Enceladus among the top targets in the search for life. Other notable moons include Iapetus, with one bright face and one dark face sharply divided; Mimas, with a giant crater that gives it the look of the Star Wars Death Star; and Hyperion, a sponge-like moon with chaotic tumbling rotation.

Space exploration: from Pioneer to Cassini

Pioneer 11 flew past Saturn in 1979 and made the first measurements of its magnetic field and temperatures. Voyager 1 and 2 passed in 1980 and 1981, revealing the ring structure in detail, atmospheric storms and smaller moons. The Cassini-Huygens mission, a partnership between NASA, ESA and the Italian space agency ASI, entered orbit around Saturn in July 2004 and operated for 13 years until September 2017.

Cassini made revolutionary discoveries: it identified Enceladus's geysers, revealed Titan's lakes, mapped the rings in unprecedented detail and recorded global Saturn storms. The mission ended with a deliberate plunge into the planet to avoid contaminating Titan or Enceladus with Earth microbes. The next planned mission to the Saturn system is NASA's Dragonfly, which will land on Titan's surface in 2034 and explore the moon with a rotorcraft drone.

Saturn facts and records

• Saturn is the least dense planet in the Solar System: it would float in water if there were an ocean large enough.
• It leads the Solar System in moon count: 274 confirmed as of 2025, compared with Jupiter's 95.
• The rings span more than 280,000 km in radial extent but are only tens to hundreds of metres thick in the main sections.
• The north polar hexagonal storm has been imaged continuously since the Voyager flybys in 1980 and is the only known stable atmospheric hexagon on any planet.
• Titan is the only place beyond Earth with an evaporation cycle, clouds, rainfall and stable surface lakes, even if the liquid is methane rather than water.
• Saturn's polar hexagon has sides roughly 14,500 km long, each wider than Earth's diameter.

Other planets

• ☿ Mercury
• ♀ Venus
• ♂ Mars
• ♃ Jupiter
• ♅ Uranus
• ♆ Neptune