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Saturn has 146 known moons, 63 of which have formal names. [12] [11] It is estimated that there are another 100 ± 30 outer irregular moons larger than 3 km (2 mi) in diameter. [98] In addition, there is evidence of dozens to hundreds of moonlets with diameters of 40–500 meters in Saturn's rings, [99] which are not considered to be true moons.
The sizes and masses of many of the moons of Jupiter and Saturn are fairly well known due to ... be between 100 and 199 km in radius (200 and 399 km in diameter). The ...
Mimas. Mimas imaged by the Cassini orbiter, February 2010. Mimas's surface is dominated by craters; the large crater at the right is Herschel. Mimas, also designated Saturn I, is the seventh-largest natural satellite of Saturn. With a mean diameter of 396.4 kilometres or 246.3 miles, Mimas is the smallest astronomical body known to be roughly ...
The dense main rings extend from 7,000 km (4,300 mi) to 80,000 km (50,000 mi) away from Saturn's equator, whose radius is 60,300 km (37,500 mi) (see Major subdivisions). With an estimated local thickness of as little as 10 metres (32' 10") [ 40 ] and as much as 1 km (1093 yards), [ 41 ] they are composed of 99.9% pure water ice with a ...
After Phoebe, Ymir is the largest of the known retrograde irregular moons, with an estimated diameter of only 22 km. [1] Phoebe, at 213 ± 1.4 km in diameter, is by far the largest of Saturn's irregular satellites. [30] It has a retrograde orbit and rotates on its axis every 9.3 hours. [87]
Hyperion / h aɪ ˈ p ɪər i ə n /, also known as Saturn VII, ... The largest crater on Hyperion is approximately 121.57 km (75.54 mi) in diameter and 10.2 km ...
Phoebe is roughly spherical and has a diameter of 213 ± 1.4 km[4] (132 mi), approximately one-sixteenth that of the Moon. It is Saturn's ninth-largest moon, but it is the eighth-most massive. Hyperion, another one of Saturn's moons, has a larger radius, but is less massive than Phoebe. Phoebe rotates every nine hours and 16 minutes, and ...
Iapetus (/ aɪˈæpətəs /) 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. [a] Named after the Titan Iapetus, the moon was discovered in 1671 by Giovanni Domenico Cassini.