PHOEBE, in Astronomy
| fēˈbē, in astronomy, one of the 18 named moons, or natural satellites, of Saturn. Also known as Saturn IX (or S9), Phoebe is 137 mi (220 km) in diameter, orbits Saturn at a mean distance of 8,047,985 mi (12,952,000 km), has an orbital period of 550.5 earth days, and rotates on its axis in about nine hours. The outermost of the known satellites, Phoebe was discovered by American astronomer William H. Pickering in 1898. Phoebe's reflectivity is very low. Its orbit is inclined 175° to Saturn; that is, its north pole is almost aligned with the planet's south pole. Phoebe is the only one of the moons that orbits with retrograde motion, i.e., opposite to that of the planet's rotation. The sharp inclination of its orbit and its retrograde motion encourage the belief that Phoebe is a captured object similar to an asteroid rather than a native satellite. ____________________The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved. -37396- | |
|
About Questia
Questia is the world's largest online academic library offering full-text books, journals, and articles on thousands of topics.
Join Now...
|
|
Questia Books and Articles on: Phoebe in Astronomy
|
| We found: |
41 results |
By media type: |
Books: | Journal articles: | Magazine articles: | Newspaper articles: | Encyclopedia articles: |
|
|