Planet · Ice giant
Neptune
- Type
- Ice giant
- Diameter
- 49,528 km
- Distance from Sun
- 4,495.1 M km
- Surface gravity
- 11 m/s²
- Mean temp.
- -200 °C
- Moons
- 14
NASA/JPL · NASA media (public domain)
Overview
Scientific overview
Neptune is a ice giant in orbit around The Sun, at a mean distance of 4,495.1 million km from the Sun.
Physical characteristics
- Mass
- 102 ×10²⁴ kg
- Diameter
- 49,528 km
- Radius
- 24,764 km
- Density
- 1.638 g/cm³
- Surface gravity
- 11 m/s²
- Escape velocity
- 23.5 km/s
- Rotation period
- 16.1 h
- Mean temperature
- -200 °C
Scale
Compared to Earth
Earth
Neptune
Neptune is 3.9× Earth
49,528 km across · Earth is 12,742 km
Orbit
- Distance from Sun
- 4,495.1 million km (30.047 AU)
- Orbital period
- 163.72 years
- Perihelion
- 4,444.5 million km
- Aphelion
- 4,545.7 million km
- Eccentricity
- 0.011
- Orbital inclination
- 1.8°
- Axial tilt
- 28.3°
- Orbital velocity
- 5.4 km/s
Gallery
Neptune
This contrast enhanced color picture of Neptune was acquired by NASA Voyager 2 on Aug.
1999
NASA/JPL · NASA media (public domain)
Observation
How this was captured
- Source
- NASA
- Observation date
- 1998-10-30
Moons (3)
Exploration
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
- NASA JPLJet Propulsion Laboratory / Solar System Dynamics
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.