Neptune

Discovered 23/09/1846 · Urbain Le Verrier, John Couch Adams, Johann Galle

Predicted mathematically before observation

Mean Radius

24,622 km

Gravity

11.15 m/s²

Temperature

55 K (-218°C)

Orbital Period

60189.0 d

Distance

30.069 AU

Physical Properties

Mean Radius24,622 km

Mass1.0241 × 10^26 kg

Surface Gravity11.15 m/s²

Density1.638 g/cm³

Escape Velocity23.56 km/s

Mean Temperature55 K (-218°C)

Axial Tilt28.30°

Rotation Period16.11 h

AtmosphereYes

Ring SystemYes

Known Moons16

Orbital Elements (J2000)

Semi-major Axis30.069495 AU

Eccentricity0.011300

Inclination1.7690°

Orbital Period60189.00 days

Asc. Node (Ω)131.72169°

Arg. Perihelion (ω)44.97135°

Mean Anomaly (M₀)304.88003°

Perihelion4459753056.000 AU

Aphelion4537039826.000 AU

Known Moons (16)

TritonNéreïdeNaïadeThalassaDespinaGalatéeLarissaProtéeHalimèdePsamathéeSaoLaomédieNésoHippocampeS/2021 N 1S/2002 N 5

Data Sources

Physical & orbital data: Solar System OpenData API (api.le-systeme-solaire.net) · Orbital elements: NASA JPL Horizons System (J2000 epoch)