| Discovered By | Johann Galle |
| Date of Discovery | 1846 |
| Average Distance from the Sun | 4,498,252,900 km (metric)
2,795,084,800 miles (english) |
| Perihelion (closest) | 4,459,630,000 km (metric)
2,771,087,000 miles (english) |
| Aphelion (farthest) | 4,536,870,000 km (metric)
2,819,080,000 miles (english) |
| Equatorial Radius | 24,764 km (metric)
15,388 miles (english) |
| Equatorial Circumference | 155,597 km (metric)
96,683 miles (english) |
| Volume | 62,526,000,000,000 km3 (metric) |
| Mass | 102,440,000,000,000,000,000,000,000 kg (metric) |
| Density | 1.76 g/cm3 (metric) |
| Surface Area | 7,640,800,000 km2 (metric)
2,950,100,000 miles2 (english) |
| Equatorial Surface Gravity | 10.71 m/s2 (metric)
35.14 ft/s2 (english) |
| Escape Velocity | 85,356 km/h (metric)
53,038 mph (english) |
| Sidereal Rotation Period (Length of Day) | 0.67125 Earth days (16.11 hours) |
| Sidereal Orbit Period (Length of Year) | 164.79 Earth years (60,190 Earth days) |
| Mean Orbit Velocity | 19,720 km/h (metric)
12,253 mph (english) |
| Orbital Eccentricity | 0.00859 |
| Orbital Inclination to Ecliptic | 1.769° |
| Equatorial Inclination to Orbit | 29.58° |
| Orbital Circumference | 28,142,000,000 km (metric)
17,487,000,000 miles (english) |
| Effective Temperature | -214° C (metric)
-353° F (english) |
| Atmospheric Constituents | Hydrogen, Helium, Methane |
| Neptune's Moons | Naiad
Thalassa
Despina
Nereid
Galatea
Larissa
Proteus
Triton
S/2002 N1
S/2002 N2
S/2002 N3
S/2002 N4
Psamathe |
