Mimas was discovered by William Herschel in 1789 and is one of the innermost moons of Saturn. It has an icy surface with many craters with a low surface temperature of about -200° C (-328°F). Its low density indicates that most of the moon is composed of ice.
Mimas has enormous impact craters with one measuring the size of 130 kilometers (80 miles) wide. This crater is called the Herschel and it extends one-third the diameter of Mimas! The crater is 10 kilometers high (6 miles) and has a central mountain as high as Mount Everest on Earth.
The larger cratering of the surface (greater than 40 kilometers: 25 miles) occurs almost everywhere except in the south polar region. In that region most craters are relatively small with the largest being 20 kilometers (12 miles), possibly the result of some surface activity.
|PHYSICAL DATA FOR MIMAS|
|Mass (kg)||3.80e + 19|
|Mass (Earth = 1)||6.3588e - 06|
|Radius (Earth = 1)||3.0731e - 02|
|Mean Density (g/cm3)||1.17|
|Mean Distance from Saturn (km)||185,520|
|ORBITAL DATA FOR MIMAS|
|Rotational period (days)||0.942422|
|Orbital period (days)||0.942422|
|Mean orbital velocity (km/s)||14.32|
|Orbital inclination (degrees)||1.53|