S/2009 S 1 is a 'propeller moonlet' of
Saturn orbiting at a distance of approximately , in the outer part of Saturn's
B Ring, and with an approximate
diameter of . It was discovered by the
Cassini Imaging Team on 26 July 2009. The moonlet was noticed during the 2009
equinox event by an approximately 36-kilometer-long shadow that it cast on Saturn's B ring. S/2009 S 1 protrudes approximately above the ring. The image was taken approximately from Saturn.