Neptune's vital statistics
| Neptune | Earth | Neptune/Earth Ratio | |
| Equatorial diameter | 49,528 km | 12,756 km | 3.88 |
| Mass | 102.4 x 1021 t | 5.9 x 1021 t | 17.15 |
| Mean density | 1.64 | 5.52 | 0.30 |
| Rotation period | 16 h 06 min | 23 h 56 min | 0.67 |
| Revolution period (Neptunian year) | 60,189 days or 164 Earth days | 365 Earth days | 164.79 |
| Length of a solar day | 16 h 06 min | 24 h | 0.67 |
| Surface gravity | 11.15 m/s2 | 9.8 m/s2 | 1.14 |
| Natural satellites | 13 | 1 | --- |
| Ring system | Yes | No | --- |
| Orbit | |||
| Aphelion | 4,545 million km | 152 million km | 29.88 |
| Perihelion | 4,444 million km | 147 million km | 31.22 |
| Furthest distance from Earth | 4,687 million km | --- | --- |
| Closest distance to Earth | 4,305 million km | --- | --- |
