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Neptune: where is it right now?

Neptune is 28.89 AU (4.32 billion km) from Earth right now and 29.88 AU (4.47 billion km) from the Sun. Light takes 4 h 0 min to get there. ()

The outermost planet, an ice giant with the fastest winds measured in the Solar System — over 2,000 km/h.

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Neptune facts

Distance from Earth now
28.89 AU (4.32 billion km)
Distance from the Sun now
29.88 AU (4.47 billion km)
Light time from Earth
4 h 0 min
Mean radius
24,622 km (3.865 × Earth)
Mass
1.024 × 10^26 kg
Surface gravity
11.27 m/s² (1.15 g)
Escape velocity
23.6 km/s
Rotation period
16.0 hours
Year (orbit around the Sun)
164.77 years (60,182 days)
Average distance (semi-major axis)
30.07 AU (4.50 billion km)
Orbital eccentricity
0.0100
Inclination to the ecliptic
1.77°
Next closest approach to Earth
27 September 2027 — 28.87 AU (4.32 billion km)

Positions from NASA JPL Horizons; physical constants from the IAU and JPL. Distances are centre to centre.

Neptune: questions people ask

How far is Neptune from Earth right now?

As of 4 October 2026, Neptune is 28.89 AU (4.32 billion km) from Earth; light takes 4 h 0 min to cover that distance. Over the next 30 years the distance ranges from about 28.78 AU (4.31 billion km) to 30.87 AU (4.62 billion km).

When is Neptune closest to Earth next?

Around 27 September 2027, when it comes within 28.87 AU (4.32 billion km) of Earth (calculated from NASA JPL Horizons orbits).

How long is a year on Neptune?

Neptune takes 164.77 years (60,182 days) to orbit the Sun once, at an average distance of 30.07 AU (4.50 billion km).

How long is a day on Neptune?

Neptune rotates once every 16.0 hours relative to the stars.

How big is Neptune compared to Earth?

Neptune’s radius is 24,622 km, 3.86 times Earth’s, and its surface gravity is 1.15 times Earth’s (11.27 m/s²).