S/2009 S 1
S/2009 S 1 is a moonlet embedded in the outer part of Saturn's B Ring, orbiting away from the planet. The moonlet was discovered by the "Cassini" Imaging Team during the Saturnian equinox event on 26 July 2009, when the "Cassini" spacecraft imaged the moonlet casting a -long shadow onto the B Ring. With a diameter of , it is most likely a long-lived solid body, which would count it as the smallest and innermost known moon of Saturn. Discovery. was first identified by the "Cassini" Imaging Team led by Carolyn Porco, in a single image  taken by the "Cassini" spacecraft approximately from Saturn on 26 July 2009 11:30 UTC. The moonlet was discovered during Saturn's 2009 equinox, when it cast an approximately -long shadow on the planet's B ring. Characteristics. Based on the shadow's width, the "Cassini" Imaging Team infer a diameter of for . The presence of a shadow suggests that the is most likely a solid body large enough to have existed since the formation of the B ring. This particular moon is one of the smallest moons of Saturn that has been directly imaged. Although it is embedded in the  B ring, does not appear to produce extensive, propeller-shaped disturbance features unlike the propeller moonlets in Saturn's A ring. This may be because the B ring is very dense at the moonlet's location, which would hinder the formation of visible propeller gaps around the moonlet.