S/2009 S 1とは 意味・読み方・使い方

S/2009 S1 is the provisional designation of one of the 'propeller moonlets' of Saturn, discovered by the Cassini Imaging Team on July 26, 2009. It orbits Saturn at a distance of about 117,000 kilometres (73,000 mi), with an approximate diameter of 400 meters (1,300 ft), in the outer part of Saturn's B Ring. The moon was noticed during a ring plane crossing event by an approximately 36 kilometres (22 mi) long shadow which it cast on Saturn's B ring. S/2009 S1 protrudes approximately 150 metres (490 ft) above the ring. The image was taken about 296,000 kilometres (184,000 mi) from Saturn.