Japetus, is the third-largest natural satellite of Saturn, and eleventh-largest in the Solar System.
Japetus, is the third-largest natural satellite of Saturn, and eleventh-largest in the Solar System. Compared to Earth’s moon, its radius is about 42% and its density is about 32.5% resulting in a mass of about 2.5% of Earth’s moon. The low density of Iapetus indicates that it is mostly composed of ice, with only a small (~20%) amount of rocky materials. Unusual physical characteristics: Iapetus is best known for its dramatic ‘two-tone’ coloration, but discoveries by the Cassini mission in 2007 have revealed several other unusual physical characteristics, such as an equatorial ridge that runs about halfway around the moon. The pattern of coloration is analogous to a spherical yin-yang symbol or the two sections of a tennis ball. Daytime And Nighttime Temperature: 85K -- source link
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