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Comparison Chart
Comparison: Sao vs. Neptune

This chart shows the differences between Sao 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
Tommy Grav, Matthew J. Holman, John J. Kavelaars, Wesley C. Fraser, and Dan Milisavljevic
Urbain Le Verrier, John Couch Adams, Johann Galle
Date of Discovery
14 August 2002
23 September 1846
Average Orbit Distance
22,228,000 km
4,498,396,441 km
Perihelion/Perigee (closest)
19,193,878 km
4,459,753,056 km
Aphelion/Apogee (farthest)
25,262,122 km
4,537,039,826 km
Equatorial Radius
22.0 (assuming an albedo of 0.04) km
24,622 km
Equatorial Circumference
138.2 km
154,704.6 km
44,602 km3
62,525,703,987,421 km3
89,920,105,985,831,600 kg
102,410,000,000,000,000,000,000,000 kg
1.5 g/cm3
1.638 g/cm3
Surface Area
6,082.12 km2
7,618,272,763 km2
Equatorial Surface Gravity
0.012 m/s2
11.15 m/s2
Escape Velocity
84 km/h
84,816 km/h
Orbit Period (Length of Year)
7.974592745 sidereal years
164.79132 sidereal years
Mean Orbit Velocity
1,988.5 km/h
19,566 km/h
Orbit Eccentricity
Orbit Inclination to Ecliptic
1.77 degrees
Orbit Circumference
139,009,795.11 km
28,263,736,967 km


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System of measurement:

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Last Updated: 28 Apr 2014