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.