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Saturn's icy, impact-riddled moon Mimas slips briefly in front of Saturn's moon Janus in this movie from Cassini. Mimas is 397 kilometers (247 miles) across, while Janus is 181 kilometers (113 miles) across. The movie was created from 37 original images taken over the course of 20 minutes as the spacecraft's narrow-angle camera remained pointed toward Janus. Although Mimas moves a greater distance across the field of view, Janus also moved perceptibly during this time. The images were aligned to keep Janus close to the center of the scene. Additional frames were inserted between the 37 Cassini images in order to smooth the appearance of Mimas' movement--a scheme called interpolation. Close-up images from the few minutes surrounding the occultation are arranged into a strip along the bottom of the movie. The terrain on Mimas seen here is about 80 degrees west of the terrain seen in a previously released movie (see
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