NEPTUNE.
At the edge of the planetary realm.
SCHEMATIC / NOT A SURFACE MAP
01 /
The measured world
- Mean radius
- 24,622 km
- Mean diameter
- 49,244 km
- Mass
- 1.024e+26 kg
- Gravity
- 11.15 m/s²
- Escape velocity
- 23.5 km/s
- Mean temperature
- -200 °C
- Rotation period
- 16.11 Earth hours
- Orbital period
- 60,189 Earth days
- Mean distance from Sun
- 30.07 AU
Rounded reference values. Rotation is sidereal and differs from the solar day. Giant planets have no solid surface; temperature and gravity use atmospheric reference levels. Some moon counts are omitted because discoveries change them.
Compare with EarthA closer look
Neptune has extremely strong atmospheric winds.
Its largest moon, Triton, orbits in a retrograde direction.
Atmosphere
Hydrogen, helium, and methane.
Discovery
Observed in 1846 after mathematical predictions of its position.