The number of water particles in Enceladus' plume peaked over the area highlighted by the circle in this image of Enceladus, which is overlain by data from Cassini's Ion and Neutral Mass Spectrometer, and the spacecraft's trajectory, during its fly-through of the plume on March 12, 2008.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. The Ion and Neutral Mass Spectrometer was designed and built at Southwest Research Institute (SwRI), and the team is at SwRI in San Antonio, Texas.
For more information about the Cassini-Huygens mission, visit: http://saturn.jpl.nasa.gov.