Ice giant · 8th planet from the Sun
Neptune
The windiest planet in the solar system, with the strongest sustained winds ever recorded — over 2,000 km/h.
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Size & Distance
Diameter49,244 km
Vs. Earth's diameter3.86×
Distance from Sun30.1 AU (4495.0M km)
Distance from Earth (range)4353M – 4652M km
Mass & Gravity
Mass vs. Earth17.1×
Surface gravity vs. Earth1.13×
Known moons14 known moons
Time
Length of day16 hours 6 minutes
Length of year~165 years
Orbit
Orbital period60,190 days
Planet typeIce giant
Interesting facts about Neptune
- Neptune was the first planet located through mathematical prediction rather than direct observation, after astronomers noticed irregularities in Uranus's orbit.
- Neptune has completed only one full orbit of the Sun since its discovery in 1846 (as of the mid-2020s).
- Its largest moon, Triton, orbits backwards compared to Neptune's rotation, suggesting it's a captured object rather than one that formed alongside the planet.
FAQ
How far is Neptune from the Sun?
An average of about 30.1 AU (4495.0 million km).
How big is Neptune?
49,244 km in diameter — about 3.86× the diameter of Earth.
How much would I weigh on Neptune?
Multiply your Earth weight by 1.13 — Neptune's surface gravity is 1.13× Earth's. Try our weight calculator for an exact number.
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