TABLE 8.1 Characteristics of the Large- and Medium-Size Satellites of the Giant Planets

Primary Satellite Distance from Primary(km) Radius (km) Bulk Density (g cm-3) Geometric Albedo Dominant Surface Composition Surface Atmospheric Pressure (bars) Dominant Atmospheric Composition Notes
Jupiler Io 422,000 1,822 3.53 0.6 S, SO2, silicates 10-9 SO2 Intense tidally driven voleanism, plumes, high mountains
Europa 671,000 1,561 3.01 0.7 H2O, hydrates 10--12 O2 Recent complex resurfacing, probable subsurface ocean
Ganymede 1,070,000 2,631 1.94 0.4 H2O, hydrates 10--12 O2 Magnetic field, ancient tectonism, probable subsurface ocean
Callislo 1,883,000 2,410 1.83 0.2 H2O Phyllosilicates? Partially undifferentiated, heavily cratered, probable subsurface ocean
Salurn Mimas 186,000 198 1.15 0.6 H2O Heavily cratered
Enceladus 238,000 252 1.61 1.0 H2O Intense recent tectonism, active water vapor/ice jets
Tethys 295,000 533 0.97 0.8 H2O Heavily crate red, fractures
Dione 377,000 562 1.48 0.6 H2O Limited resurfacing, fractures
Rhea 527,000 764 1.23 0.6 H2O Heavily crate red, fractures
Tiian 1,222,000 2,576 1.88 0.2 H2O, organics, liquid CH4 1.5 N2,CH4 Active hydrocarbon hydrologic cycle, complex organic chemistry
Iapetus 3,561,000 736 1.08 0.3 H2O, organics? Heavily cratered, extreme albedo dichotomy


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