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

	Psamathe	Neptune
Discovered By	Scott S. Sheppard, David C. Jewitt and Jan T. Kleyna	Urbain Le Verrier, John Couch Adams, Johann Galle
Date of Discovery	29 August 2003	23 September 1846
Average Orbit Distance	48,096,000 km	4,498,396,441 km
Perihelion/Perigee (closest)	29,776,234 km	4,459,753,056 km
Aphelion/Apogee (farthest)	66,415,766 km	4,537,039,826 km
Equatorial Radius	20.0 (assuming an albedo of 0.04) km	24,622 km
Equatorial Circumference	125.7 km	154,704.6 km
Volume	33,510 km3	62,525,703,987,421 km3
Mass	14,986,684,330,971,900 kg	102,410,000,000,000,000,000,000,000 kg
Density	1.5 g/cm3	1.638 g/cm3
Surface Area	5,026.55 km2	7,618,272,763 km2
Equatorial Surface Gravity	0.003 m/s2	11.15 m/s2
Escape Velocity	36 km/h	84,816 km/h
Orbit Period (Length of Year)	24.8440794 sidereal years	164.79132 sidereal years
Mean Orbit Velocity	1,335.8 km/h	19,566 km/h
Orbit Eccentricity	0.3809	0.00859048
Orbit Inclination to Ecliptic	126.312	1.77 degrees
Orbit Circumference	290,917,287.50 km	28,263,736,967 km