Spacecraft Flybys
The Voyager 2 spacecraft passed by Phoebe in September 1981, although the 2.2 Gm (2.2 million kilometres) distance and low resolution meant that relatively little could be learned from the resulting images.
Cassini passed within 2,068 kilometres (1,285 mi) of Phoebe on 11 June 2004, returning many high-resolution images of the moon and its scarred surface. The mission plan was designed to allow Cassini to perform a close flyby of Phoebe during its approach to Saturn; otherwise, due to Phoebe's distance from Saturn, the pictures returned would probably not have been much better than those from Voyager. Due to its rapid rotation period of approximately 9 hours, 56 minutes, Cassini was able to map virtually the entire surface of Phoebe.
Read more about this topic: Phoebe (moon)