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Proteus


Proteus is the sixth of Neptune's satellites. Like all six of Neptune's small satellites, is one of the darkest objects in the solar system -- "as dark as soot" is not too strong of a description. Like Saturn's satellite, Phoebe, it reflects only 6 percent of the sunlight that strikes it. It is about as large as a satellite can be without being pulled into a spherical shape by its own gravity. Proteus is irregularly shaped and shows no sign of any geological modification.


Orbital Distance:   117,600 km (circular orbit)
Eccentricity:       0.000
Local Year:         1.100 days (1d 2h 24m 0s)
Orbital Velocity:   7.636 km/s
Inclination:        0°
Local Day:          1.100 days (1d 2h 24m 0s)
Axial Tilt:         n/a

Diameter:           418 km
Composition:        Rock and Ice
Density:            1.76 g/cm3
Mass:               6.73 x 1016 tonnes (11/million earths)
Gravity:            0.01 G
Escape Velocity:    0.207 km/s
Area:               550,000 km2
Surface Material:   Dark soil and ice
Atmosphere:         None
Pressure:           None
Albedo:             0.06
Temperature:        ???°C

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