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On this polar stereographic map of Enceladus' south polar terrain, all 100 geysers have been plotted whose source locations have been determined in Cassini's imaging survey of the moon's geyser basin. The uncertainty attached to each location is given by the size of the surrounding circle.
Five sources are indicated by dashed circles. Each of these jets appeared only in images taken very close together in time; in other words, the source locations have been confidently determined, but their tilts are uncertain.
The two crosses -- one on Alexandria and one at the end of Baghdad -- indicate two jets. Each was observed in one image only but each was intersected by the shadow of Enceladus, as in PIA17184, allowing a determination of the fracture on which they lie.
This map and the information it contains were used to compare geysering activity with enhanced thermal emission observed by Cassini's heat-measuring instruments and with the distribution of tidal stresses across the region. Those comparisons yielded the clues needed to ascertain the mechanisms underlying the geysering process.
The Cassini Solstice Mission is a joint United States and European endeavor. 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 imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.