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The surface of Iapetus is heavily cratered, with large impact basins up to 580 kilometres across. Surface darkening on Iapetus comes from organic materials left behind as ice in the warmer Cassini Region region sublimates.
Iapetus is heavily cratered, and Cassini images have revealed large impact basins, at least five of which are over 350 km (220 mi) wide.
Jan 7, 2005 · This view of Saturn's moon Iapetus captured by NASA's Cassini spacecraft shows how the dark, heavily cratered terrain of Cassini Regio transitions to a bright, icy terrain at high latitudes.
Jan 7, 2005 · January 7, 2005. This oblique view of Saturn's moon Iapetus from high latitude shows how the dark, heavily cratered terrain of Cassini Regio transitions to a bright, icy terrain at high latitudes.
Overview. Iapetus has been called the yin and yang of the Saturn moons because its leading hemisphere has a reflectivity (or albedo) as dark as coal (albedo 0.03-0.05 with a slight reddish tinge) and its trailing hemisphere is much brighter at 0.5-0.6.
Feb 25, 2005 · Iapetus, Saturn's third-largest moon, orbits at a mean distance of 3.56 × 10 6 km on a slightly inclined prograde orbit. Cassini ISS obtained images of Iapetus during its first three orbits and during a flyby on 31 December 2004 with pixel scales that improve substantially on Voyager coverage.
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Apr 27, 2019 · Iapetus is heavily cratered, with the largest known crater being the 580 km wide Turgis Crater; which is 40% of the moon's diameter! The Voyager I and Voyager II encounters during 1980 and 1981 validated Cassini's original observations revealing a trailing hemisphere lighter in colour.
