Map of the Universe
Neptune
Planet · Eighth planet from the Sun
About Neptune
On 2026-01-01, the date the map shows, Neptune was 29.9 AU from the Sun; sunlight takes 4.14 hours to reach it.
It goes round the Sun once every 165.2 years, at an average distance of 30.107 AU.
It is about 49,240 km across.
The map lists it as a planet and shows it in the Solar System part of the map, drawn on the plane of Earth’s orbit (the ecliptic).
Key numbers
| Semi-major axis | 30.107 AU |
|---|---|
| Orbital period | 165.2 years |
| Eccentricity | 0.0110 |
| Inclination | 1.77° |
| Mass | 1.02 × 10²⁶ kg |
| Radius | 24,622.0 km |
| Day length | 16.1 h |
| Mean temperature | −200 °C (1 bar) |
| Distance from the Sun | 29.9 AU |
Where it is
Its place in the universe, from the inside out: Solar System › Orion–Cygnus Arm (Local Arm) › Milky Way › Local Group › Virgo Supercluster › Laniakea Supercluster › Observable universe.
Zoom out to see it in context: Neptune and the Kuiper belt, a view about 110 AU across.
From Wikipedia
Neptune is the eighth and farthest known planet orbiting the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth.
Excerpt from the Wikipedia article Neptune, licensed CC BY-SA 4.0.