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.

	Nereid	Neptune
Discovered By	G. Kuiper	Urbain Le Verrier, John Couch Adams, Johann Galle
Date of Discovery	1949	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
Volume	20,579,526 km3	62,525,703,987,421 km3
Mass	30,872,569,721,802,200,000 kg	102,410,000,000,000,000,000,000,000 kg
Density	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
Mean Orbit Velocity	3,363.0 km/h	19,566 km/h
Orbit Eccentricity	0.7507	0.00859048
Orbit Inclination to Ecliptic	7.09 degrees	1.77 degrees
Orbit Circumference	29,067,053.44 km	28,263,736,967 km