Neptune
At the edge of the planetary realm.
Neptune is a cold, windy ice giant far beyond the warmth of the inner solar system. It was found after calculations predicted where an unseen planet should be.
Explore this orbit ↗
Image: NASA / JPL-Caltech; Voyager 2 (processed color). Processed mission imagery; apparent color varies with filters and processing.
Neptune compared with Earth
Its equatorial diameter is 3.88 times Earth’s. Its mass is 17.09 times Earth’s, while its orbital period is 163.75 Earth years.
The reference gravity is about 11 m/s². These rounded values include the reference conventions used in NASA’s fact sheet; the ideal spherical gravity calculator can differ slightly.
A few good questions
How far is Neptune from the Sun?
Neptune has a mean orbital distance of about 4,515 million kilometers, or 30.18 AU. Its actual distance varies through its elliptical orbit.
How long is a year on Neptune?
An orbit takes approximately 59,800 Earth days. The orbit simulator lets you see how distance affects the length of a year.