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Helene from Cassini's March 3, 2010 flyby

Helene from Cassini's March 3, 2010 flyby
Helene from Cassini's March 3, 2010 flyby These four images of Helene, Dione's leading co-orbital satellite about 30 kilometers in diameter, were taken by Cassini during a close flyby on March 3, 2010. The top two images mostly show Helene's anti-Saturn hemisphere, while the bottom two mostly show Helene's sub-Saturn hemisphere, lit by Saturnshine. Two dark "donuts" on the bottom images are artifacts that result from dust within Cassini's optics. NASA / JPL-Caltech / SSI / montage by Emily Lakdawalla