Planet
Neptune
The farthest planet from the Sun. The fastest winds in the Solar System (2,100 km/h) blow here. It was discovered by mathematics, not by telescope (1846).
| Type | Planet |
|---|---|
| Parent body | Sun |
| Radius | 24,622 km · 3.86 R⊕ |
| Mass | 1.024 × 10²⁶ kg · 17.1 M⊕ |
| Mean density | 1.64 g/cm³ |
| Surface gravity | 11.3 m/s² · 1.1 × Earth |
| Escape velocity | 23.6 km/s |
| Rotation period | 16.1 hours |
| Mean distance from the Sun | 30.1 AU (4,498 million km) |
| Eccentricity | 0.009 |
| Orbital period | 165 years |
| Temperature | 72 K (-201 °C) |
| Moons | 16 |
| Orbital period | 164.8 years |
| Discovery | 1846, Le Verrier / Galle |
Through a telescope from Earth
Moons and companions
- Triton Moon