The third-largest satellite of Saturn, diameter 1469 km; also known as Saturn VIII. It orbits 3 560 854 km from the planet’s centre every 79.33 days, keeping the same face turned towards Saturn. Its leading hemisphere is far darker than the trailing hemisphere and polar regions, the albedos being about 0.05 and 0.5 respectively, so that its mean opposition magnitude varies between 10.2 and 11.9. This one-sided darkening is thought to arise because Iapetus passes through a ring of dark material shed by the more-distant moon Phoebe, which accumulates on its leading hemisphere. Impact craters mark its icy surface, the largest of which, called Turgis, is 580 km across. An equatorial ridge runs three-quarters of the way around the moon. Iapetus was discovered in 1671 by G. D. Cassini.
http://photojournal.jpl.nasa.gov/catalog/PIA11690
One of the major satellites of Saturn, with a radius of 718 km; mass 15.9 × 1020 kg; mean density 1020 kg/m3; visual albedo 0.05–0.5. It was discovered in 1671 by G. D. Cassini.
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