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.

	Sao	Neptune
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
Volume	44,602 km3	62,525,703,987,421 km3
Mass	89,920,105,985,831,600 kg	102,410,000,000,000,000,000,000,000 kg
Density	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	0.1365	0.00859048
Orbit Inclination to Ecliptic	53.483	1.77 degrees
Orbit Circumference	139,009,795.11 km	28,263,736,967 km