In the Solar System · tracked live
Neptune
The furthest planet, four and a half billion kilometres out, and the only one found by arithmetic before anybody looked: its position was worked out from the way it was pulling Uranus off course. It has the fastest winds in the Solar System, over 2,000 km/h, and Triton - a moon going round it backwards, which means it was captured, and which vents nitrogen at −235 °C.
- Radius
- 24,764 km
- Around the equator
- 155,597 km
- Mass
- 1.02 x 10^26 kg
- Compared with the Earth
- 17 ×
- Turns once in
- 15 h 58 m
- From the Sun
- 4,469,648,858 km (-3,554 km/d)
- From the Earth
- 4,327,118,119 km (+830,841 km/d)
- A signal takes
- 4 h 1 m
Distances and speed are computed from JPL Horizons trajectories and are true of the date below, changing at the rate beside each.
Everything the map shows is worked out in your browser from published orbital data - nothing on it is a stored picture of where things were.