It was first seen by Carl Murray of the Cassini Imaging Science Team in pictures taken by the Cassini-Huygens probe on June 21 , 2004 , and announced on September 9 , 2004 . It was discovered by the Cassini Imaging Science Team in images taken by the Cassini-Huygens probe on June 21 , 2004 and announced on September 9 , 2004 .