Less than 80 km! In planetary terms, very close! Almost twins? Thankfully, our moon does not have such volcanic activity. I shudder to think the effects it could have on Earth.
Io Statistics Discovered by Simon Marius & Galileo Galilei Date of discovery 1610 Mass (kg) 8.94e+22 Mass (Earth = 1) 1.4960e-02 Equatorial radius (km) 1,815 Equatorial radius (Earth = 1) 2.8457e-01 Mean density (gm/cm^3) 3.55 Mean distance from Jupiter (km) 421,600 Rotational period (days) 1.769138 Orbital period (days) 1.769138 Mean orbital velocity (km/sec) 17.34 Orbital eccentricity 0.004 Orbital inclination (degrees) 0.040 Escape velocity (km/sec) 2.56 Visual geometric albedo 0.61 Mean surface temperature -143°C Magnitude (Vo) 5.02
Moon Statistics Mass (kg) 7.349e+22 Mass (Earth = 1) 1.2298e-02 Equatorial radius (km) 1,737.4 Equatorial radius (Earth = 1) 2.7241e-01 Mean density (gm/cm^3) 3.34 Mean distance from Earth (km) 384,400 Rotational period (days) 27.32166 Orbital period (days) 27.32166 Average length of lunar day (days) 29.53059 Mean orbital velocity (km/sec) 1.03 Orbital eccentricity 0.0549 Tilt of axis (degrees) 1.5424 Orbital inclination (degrees) 5.1454 Equatorial surface gravity (m/sec^2) 1.62 Equatorial escape velocity (km/sec) 2.38 Visual geometric albedo 0.12 Magnitude (Vo) -12.74 Mean surface temperature (day) 107°C Mean surface temperature (night) -153°C Maximum surface temperature 123°C Minimum surface temperature -233°C
Courtesy www.solarviews.com