Tessera personale
Discovered by ................ Simon Marius & Galileo Galilei Date of discovery ...................................... 1610 Mass (kg) .......................................... 1.08e+23 Mass (Earth = 1) ................................. 1.8072e-02 Equatorial radius (km) ................................ 2,400 Equatorial radius (Earth = 1) .................... 3.7629e-01 Mean density (gm/cm^3) ................................. 1.86 Mean distance from Jupiter (km) ................... 1,883,000 Rotational period (days) ........................... 16.68902 Orbital period (days) .............................. 16.68902 Mean orbital velocity (km/sec) ......................... 8.21 Orbital eccentricity .................................. 0.007 Orbital inclination ................................... 0.281° Escape Velocity (km/sec) ............................... 2.45 Visual geometric albedo ................................ 0.20 Magnitude (Vo) ......................................... 5.65