Neptune

Document v1 · published by Koskamo · updated 2026-10-04

Neptune facts from the NASA Planetary Fact Sheet (metric).

Mass: 102 × 10²⁴ kg
Diameter: 49,528 km
Density: 1638 kg/m³
Gravity: 11.0 m/s²
Escape Velocity: 23.5 km/s
Rotation Period: 16.1 hours
Length of Day: 16.1 hours
Distance from Sun: 4515.0 × 10⁶ km
Perihelion: 4471.1 × 10⁶ km
Aphelion: 4558.9 × 10⁶ km
Orbital Period: 59,800 days
Orbital Velocity: 5.4 km/s
Orbital Inclination: 1.8 degrees
Orbital Eccentricity: 0.010
Obliquity to Orbit: 28.3 degrees
Mean Temperature: -200 C
Surface Pressure: Unknown (NASA footnote: The surfaces of Jupiter, Saturn, Uranus, and Neptune are deep in the atmosphere and the location and pressures are not known.)
Number of Moons: 16
Ring System?: Yes
Global Magnetic Field?: Yes
Detailed NASA fact sheet: https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html
Values compared to Earth: https://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_ratio.html
Notes on the values: https://nssdc.gsfc.nasa.gov/planetary/factsheet/planetfact_notes.html
Fact sheet last updated: 18 March 2025

Source and provenance

Original source: nssdc.gsfc.nasa.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: NASA Planetary Fact Sheet (NSSDCA), a work of the US government (public domain in the United States)

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Neptune facts from the NASA Planetary Fact Sheet (metric).

- Mass: 102 × 10²⁴ kg
- Diameter: 49,528 km
- Density: 1638 kg/m³
- Gravity: 11.0 m/s²
- Escape Velocity: 23.5 km/s
- Rotation Period: 16.1 hours
- Length of Day: 16.1 hours
- Distance from Sun: 4515.0 × 10⁶ km
- Perihelion: 4471.1 × 10⁶ km
- Aphelion: 4558.9 × 10⁶ km
- Orbital Period: 59,800 days
- Orbital Velocity: 5.4 km/s
- Orbital Inclination: 1.8 degrees
- Orbital Eccentricity: 0.010
- Obliquity to Orbit: 28.3 degrees
- Mean Temperature: -200 C
- Surface Pressure: Unknown (NASA footnote: The surfaces of Jupiter, Saturn, Uranus, and Neptune are deep in the atmosphere and the location and pressures are not known.)
- Number of Moons: 16
- Ring System?: Yes
- Global Magnetic Field?: Yes
- Detailed NASA fact sheet: https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html
- Values compared to Earth: https://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_ratio.html
- Notes on the values: https://nssdc.gsfc.nasa.gov/planetary/factsheet/planetfact_notes.html
- Fact sheet last updated: 18 March 2025

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Version history

Published by Koskamo2026-10-04
Version 1