| Albedo
|
0.155 +
|
| Apoapsis
|
9,655,066 km (0.0645 AU, 5,999,379.872 mi) +
|
| Color
|
#999999 +
|
| Composition
|
Ice and silicates +
|
| Date of discovery
|
1 May 1949 +
|
| Discoverer
|
Gerard P. Kuiper +
|
| Escape speed
|
0.156 km/s (561.6 km/h, 0.0969 mi/s, 348.962 mph) +
|
| Inclination
|
0.482 rad (27.6 °, 30.667 grad) +
|
| Lunar mass
|
3.09e+19 kg (4.20505e-4 M☾, 5.17069e-6 M⊕) +
|
| Lunar surface area
|
363,158 km² (140,216.088 mi², 0.00958 A☾, 7.11974e-4 A⊕) +
|
| Mean radius
|
170 km (105.633 mi) +
|
| Member of
|
Moon +,
Solar system +
|
| Orbital eccentricity
|
0.751 +
|
| Orbital speed
|
1.12 km/s (4,032 km/h, 0.696 mi/s, 2,505.369 mph) +
|
| Order
|
8 +
|
| Periapsis
|
1,371,734 km (0.00917 AU, 852,355.991 mi) +
|
| Planet density
|
1,500 kg/m³ (1.5 g/ml, 93.642 lb/ft³) +
|
| Primary
|
Neptune +
|
| Rotation speed
|
0.0258 km/s (92.736 km/h, 0.016 mi/s, 57.623 mph) +
|
| Semi-major axis
|
5,513,400 km (0.0369 AU, 3,425,867.931 mi) +
|
| Sidereal day
|
11.52 h (0.48 da) +
|
| Sidereal period
|
360.136 da (0.986 a) +
|
| Surface gravity
|
0.713 m/s² (2.339 ft/s², 0.0727 g) +
|
| Visiting mission
|
Voyager 2 +
|
| Categories |
Astronomy +,
Solar system +,
Moon +,
Neptune +
|
