Encyclopedia > Proteus (moon)

  Article Content

Proteus (moon)

Neptune's satellite 1989N1, obtained by Voyager 2
August 25, 1989 from a range of 146,000 kilometers
(NASA) larger version

Proteus is one of Neptune's moons. It is one of the darkest objects in the solar system, as dark as soot; like Saturn's moon Phoebe, it reflects only 6 percent of the sunlight that strikes it. Proteus is about 400 kilometers in diameter, larger than Nereid, but it wasn't discovered from Earth because it is so close to Neptune that it is lost in the glare of reflected sunlight. Proteus is irregularly shaped and shows no sign of any geological modification; scientists believe Proteus is about as large as a moon can be without being pulled into a spherical shape by its own gravity. It is heavily cratered.

  • Orbital radius: 117,600 km
  • Diameter: 418 km (436 x 416 x 402)
  • Mass: Unknown
  • Orbital period: 1.122315 days
  • Orbital inclination: 0.04°

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
East Hampton North, New York

... makeup of the town is 82.46% White, 7.39% African American, 0.08% Native American, 1.62% Asian, 0.08% Pacific Islander, 5.94% from other races, and 2.43% from tw ...

This page was created in 30 ms