1Class 23Satellites of Jupiter and Saturn Jovian system Galilean satellites The four inner satellites The other satellites Saturnian system Titan The six wierd satellites of SaturnI : Jovian System Current total… 63 moons known 4 small inner satellites Rocky objects orbiting in equatorial plane 4 large Galilean satellites (ice) Icy planet-sized satellites in equatorial plane 55 other small satellites Out of plane 48 are in retrograde orbits Probably captured asteroids23Galilean satellites… Io Have already come across this moon… most volcanicbody in solar system due to tidal heating Undergoes interesting electromagnetic interactionswith Jupiter Europa Galileo revealed icy surface Evidence for liquid water ocean below 1-10km of ice(ice rafts) Most likely rocky interior (density 3000kg/m3) Probably best bet for terrestrial life Quarantined by NASA… only fully sterilized spaceprobes will be allowed to land there.456 Ganymede Density (1936kg/m3) suggests ice/rock mix Varied terrain Old dark cratered regions Young light less cratered regions Ice volcanism? Callisto Dark surface… seems to be covered in some darkmineral deposit Europa, Ganymede and Callisto all haveinduced magnetic fields… suggests liquid waterpresent in all of these moons78II : Saturnian system Current total… 60 moons 1 planet-sized moon (Titan) 6 moderate size moons (500-1500kmdiameter) 53 small moons (including irregular moonsand shephard satellites)9 Titan Has thick atmosphere (95% N2, rest is CH4) Surface pressure of 1.5 atm Surface temperature 95K Exotic “methane-based weather”… Huygen’sdiscovered evidence for… Past (possibly present) rivers & lakes of methane Recent methane rain at landing
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