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

	Halimede	Neptune
Discovered By	Matthew J. Holman, John J. Kavelaars, Tommy Grav, 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	16,611,000 km	4,498,396,441 km
Perihelion/Perigee (closest)	12,215,729 km	4,459,753,056 km
Aphelion/Apogee (farthest)	21,006,271 km	4,537,039,826 km
Equatorial Radius	31.0 (assuming an albedo of 0.04) km	24,622 km
Equatorial Circumference	194.8 km	154,704.6 km
Volume	124,788 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	12,076.28 km2	7,618,272,763 km2
Equatorial Surface Gravity	0.006 m/s2	11.15 m/s2
Escape Velocity	71 km/h	84,816 km/h
Orbit Period (Length of Year)	5.14464 sidereal years	164.79132 sidereal years
Mean Orbit Velocity	2,273.2 km/h	19,566 km/h
Orbit Eccentricity	0.2646	0.00859048
Orbit Inclination to Ecliptic	112.712	1.77 degrees
Orbit Circumference	102,518,463.80 km	28,263,736,967 km