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| Orbital semi-major axis | 0.39 A.U. 57.9 million km |
| Orbital eccentricity | 0.206 |
| Perihelion | 0.31 A.U. 46.0 million km |
| Aphelion | 0.47 A.U. 69.8 million km |
| Mean orbital speed | 47.9 km/s |
| Sidereal orbital period | 88.0 solar days 0.241 tropical years |
| Synodic orbital period | 115.9 solar days |
| Orbital inclination to the ecliptic | 7.00° |
| Greatest angular diameter, as seen from Earth | 13" |
| Mass | 3.30  1023 kg0.055 (Earth = 1) |
| Equatorial radius | 2440 km 0.38 (Earth = 1) |
| Mean density | 5430 kg/m3 0.98 (Earth = 1) |
| Surface gravity | 3.70 m/s2 0.38 (Earth = 1) |
| Escape speed | 4.2 km/s |
| Sidereal rotation period | 58.6 solar days |
| Axial tilt | 0.0° |
| Surface magnetic field | 0.011 (Earth = 1) |
| Magnetic axis tilt relative to rotation axis | <10° |
| Mean surface temperature | 100—700 K |
| Number of moons | 0 |
PLANETARY DATA: MERCURY