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Iapetus ( / aɪˈæpətəs /) is the outermost of Saturn's large moons. With an estimated diameter of 1,469 km, it is the third-largest moon of Saturn and the eleventh-largest in the Solar System. [a] Named after the Titan Iapetus, the moon was discovered in 1671 by Giovanni Domenico Cassini .
- 3.26 km/s
- Saturn
- 6700000 km²
Saturn's third largest moon, Iapetus has a mean radius of 457 miles (736 kilometers) and a density only 1.2 times that of liquid water. It has been suggested that Iapetus (like Rhea) is three quarters ice and one quarter rock.
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Oct 8, 2007 · This high-resolution view shows a vast range of crater sizes in the dark terrain of the leading hemisphere of Saturn's moon Iapetus. Across the scene, a few small bright spots indicate fresh, rayed craters where impactors have punched through the thin blanket of dark material to the cleaner ice beneath.
- PIA08377
May 26, 2020 · Without assuming a very high bombardment rate in the early history of the solar system, these dramatic relative crater densities must mean that Mimas, Tethys, Dione, and Rhea are substantially younger than Iapetus.
- Samuel W. Bell, Samuel W. Bell
- 2020
Sep 11, 2007 · A first glance at Iapetus says that this surface is really, really, really old. Everywhere you look, there are craters. Every crater seems to have hit another crater below it.
Jan 7, 2005 · The basin is heavily overprinted by more recent, smaller impact craters. The basin rim is delineated by steep scarps that descend to the basin floor. Many of these scarps, as well as walls of nearby craters, appear bright, probably due to exposed outcrops of relatively clean ice.
Oct 9, 2007 · This high-resolution view shows a vast range of crater sizes in the dark terrain of the leading hemisphere of Saturn's moon Iapetus. Across the scene, a few small bright spots indicate fresh, rayed craters where impactors have punched through the thin blanket of dark material to the cleaner ice beneath.
