| Discovered By | Galileo Galilei |
| Date of Discovery | 1610 |
| Average Distance from Jupiter | 422,000 km (metric) |
| Equatorial Radius | 1830 x 1818.7 x 1815.3 km (metric) |
| Mass | 89,316,000,000,000,000,000,000 kg (metric) |
| Orbit Period (Length of Year) | 1.769137786 Earth days |
| Orbital Eccentricity | 0.004 |
| Orbital Inclination to Ecliptic | 0.04° |
| Atmospheric Constituents | Sulfur dioxide |
