Phoebe (Saturn IX) was discovered by Pickering in 1898. It was the farthest satellite from Saturn : amazingly, it rotates around Saturn in a retrograde mode contrarily to the main satellites. It is probably a body captured by the planet Saturn.
Since 2000, large new telescopes allowed to discover new small satellites similar to Phoebe.
|semi-major axis||12 893 240 km|
|mean size||220 km|
|period of revolution||546 days and 14 hours|
|period of rotation||9 hours and 17 minutes|
|orbital velocity||2 km/s|
| inclination of the orbit
on the equateur of Saturn
|eccentricity of the orbit||0.1756|
|escape velocity||70 m/s|
|reflectivity (geometric albedo)||0.06|
Phoebe is especially dark. It is probably a class C asteroid (carbon) captured by Saturn.