Galilean Satellites
First satellites discovered (besides Moon)
- Follow Kepler’s laws
- orbits nearly circular with Jupiter at center
- MP2 = a3 implies MJupiter = 10-3 Msun
- Synchronous rotation (like Moon)
- tidal forces -- keep one face toward Jupiter
- Miniature solar system
- distance density
- (103 km) (gm/cm3)
- Io 422 3.6
- Europa 671 3.0
- Ganymede 1070 1.9
- Callisto 1883 1.8
- cf. Moon 384 3.4