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Comparison Chart
Comparison: Nereid vs. Neptune

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

Discovered By
G. Kuiper
Urbain Le Verrier, John Couch Adams, Johann Galle
Date of Discovery
23 September 1846
Average Orbit Distance
5,513,818 km
4,498,396,441 km
Perihelion/Perigee (closest)
1,374,595 km
4,459,753,056 km
Aphelion/Apogee (farthest)
9,653,041 km
4,537,039,826 km
Equatorial Radius
170 km
24,622 km
Equatorial Circumference
1,068.1 km
154,704.6 km
20,579,526 km3
62,525,703,987,421 km3
30,872,569,721,802,200,000 kg
102,410,000,000,000,000,000,000,000 kg
1.5 g/cm3
1.638 g/cm3
Surface Area
363,168.11 km2
7,618,272,763 km2
Equatorial Surface Gravity
0.071 m/s2
11.15 m/s2
Escape Velocity
560 km/h
84,816 km/h
Orbit Period (Length of Year)
0.985982204 Earth years
164.79132 sidereal years
Mean Orbit Velocity
3,363.0 km/h
19,566 km/h
Orbit Eccentricity
Orbit Inclination to Ecliptic
7.09 degrees
1.77 degrees
Orbit Circumference
29,067,053.44 km
28,263,736,967 km


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System of measurement:

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Last Updated: 28 Apr 2014