Image: Wikimedia Commons

Iapetus

Moon of Saturn

Also known as Japetus

Orbits: Saturn
Mass: 1.8055 yottagram
1
Sources
1.ssd.jpl.nasa.gov/?sat_phys_parRetrieved 2020-09-05
View statement on Wikidata ↗
Radius: 734.5 km
2
Sources
1.Stated in Cartographic Mapping of the Icy Satellites Using ISS and VIMS Data
2.Stated in The Orbits of the Main Saturnian Satellites, the Saturnian System Gravity Field, and the Orientation of Saturn's Pole
View statement on Wikidata ↗
Orbital period: 79.3215 days
Semi-major axis: 3,560,820 km
Discovered by: Giovanni Domenico Cassini
1
Sources
1.Stated in A Short History of Astronomy
View statement on Wikidata ↗
Discovered: October 25, 1671

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

Iapetus is the outermost of Saturn's large moons. With an estimated diameter of 1,469 km (913 mi), it is the third-largest moon of Saturn and the eleventh-largest in the Solar System. Named after the Titan Iapetus from Greek mythology, the moon was discovered in 1671 by Giovanni Domenico Cassini.

Overview

All data

49 statements · 16% with external sources · numbers in brackets are citations

Named after: Iapetos
Eccentricity: 0.02861
Density: 1.088 g/cm³
Albedo: 0.6
Inclination: 17.28 degree
Apparent magnitude: 10.2
Periapsis: 3,462,252 km
Apoapsis: 3,659,387 km

On other databases

23 identifiers linking Iapetus across the web's reference databases

Data quality

statements

16%

externally sourced

Source last edited October 23, 2026. AIDB refreshes this page daily.

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AIDB. (2026). Iapetus (Q17958). Retrieved from https://aidb.si/e/iapetus-Q17958