During the period spanning the second Enceladus flyby in July 2005 through the eleventh Titan encounter in January 2006 , the Cassini spacecraft was successfully navigated through eight close - targeted satellite encounters . Three of these encounters included the 500 km flybys of the icy satellites Hyperion , Dione and Rhea and five targeted flybys of Saturn 's largest moon , Titan . This paper will show how our refinements to Saturn 's satellite ephemerides have improved orbit determination predictions . These refinements include the mass estimates of Saturn and its satellites by better than 0.5 % . Also , it will be shown how this better orbit determination performance has helped to eliminate several statistical maneuvers that were scheduled to clean - up orbit determination and/or maneuver - execution errors .