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| Orbital semi-major axis | 30.07 A.U. 4498 million km |
| Orbital eccentricity | 0.09 |
| Perihelion | 29.81 A.U. 4460 million km |
| Aphelion | 30.33 A.U. 4537 million km |
| Mean orbital speed | 5.43 km/s |
| Sidereal orbital period | 163.7 tropical years |
| Synodic orbital period | 367.49 solar days |
| Orbital inclination to the ecliptic | 1.77° |
| Greatest angular diameter, as seen from Earth | 2.4" |
| Mass | 1.02  1026 kg17.15 (Earth = 1) |
| Equatorial radius | 24,766 km 3.88 (Earth = 1) |
| Mean density | 1638 kg/m3 0.297 (Earth = 1) |
| Surface gravity* | 11.14 m/s2 1.14 (Earth = 1) |
| Escape speed | 23.5 km/s |
| Sidereal rotation period | 0.67 solar days |
| Axial tilt** | 29.6° |
| Surface magnetic field | 0.43 (Earth 5 1) |
| Magnetic axis tilt relative to rotation axis | 46.0° |
| Surface temperature | 59 K |
| Number of moons | 8 |
PLANETARY DATA: NEPTUNE