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Comparison Chart
Comparison: Neptune vs. Earth

This chart shows the differences between Neptune and Earth. To change the planets/moons being compared, change one or more of the form fields at the bottom and click Refresh.

Discovered By
Urbain Le Verrier, John Couch Adams, Johann Galle
Known by the Ancients
Date of Discovery
23 September 1846
Average Orbit Distance
4,498,396,441 km
149,598,262 km
Perihelion (closest)
4,459,753,056 km
147,098,291 km
Aphelion (farthest)
4,537,039,826 km
152,098,233 km
Equatorial Radius
24,622 km
6,371.00 km
Equatorial Circumference
154,704.6 km
40,030.2 km
62,525,703,987,421 km3
1,083,206,916,846 km3
102,410,000,000,000,000,000,000,000 kg
5,972,190,000,000,000,000,000,000 kg
1.638 g/cm3
5.513 g/cm3
Surface Area
7,618,272,763 km2
510,064,472 km2
Equatorial Surface Gravity
11.15 m/s2
9.80665 m/s2
Escape Velocity
84,816 km/h
40,284 km/h
Rotation Period (Length of Day)
0.671 sidereal days
0.99726968 sidereal days
Orbit Period (Length of Year)
164.79132 sidereal years
1.0000174 sidereal years
Mean Orbit Velocity
19,566 km/h
107,218 km/h
Orbit Eccentricity
Orbit Inclination to Ecliptic
1.77 degrees
0.00005 degrees
Equatorial Inclination to Orbit
28.3 degrees
23.4393 degrees
Orbit Circumference
28,263,736,967 km
939,887,974 km
Atmospheric Constituents
Hydrogen, Helium, Methane
Nitrogen, Oxygen


New planets/moons to compare:

System of measurement:

Compare All Eight Planets

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NASA Official: Kristen Erickson
Advisory: Dr. James Green, Director of Planetary Science
Outreach Manager: Alice Wessen
Curator/Editor: Phil Davis
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Last Updated: 28 Apr 2014