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Enceladus Atmosphere -- Star Struck Target Name:   Enceladus Spacecraft:   Cassini Orbiter Instrument:   Ultraviolet Imaging Spectrograph Produced by:   NASA/JPL/University of Colorado Copyright:  NASA Copyright Free Policy Cross Reference:   PIA06431 Date Taken:   14 July 2005 Related Documents Enceladus Cassini At Saturn Saturn Download Options Name Type Width x Height Size PIA06431.jpg JPEG 640 x 659 34K PIA06431.jpg JPEG 1222 x 1258 88K PIA06431.tif TIFF 1222 x 1258 204K During the July 14, 2005, flyby of Saturn's moon Enceladus, Cassini's ultraviolet imaging spectrograph made the first direct detection of an atmosphere, first suggested by Cassini magnetometer measurements. The ultraviolet imaging spectrograph observed the star Gamma Orionis as Enceladus crossed in front of the star. The light of the star dimmed as it was obscured by the atmosphere before being blocked entirely by Enceladus itself. The spectrum of the starlight changed as it passed through the atmosphere, indicating the presence of water vapor. The ultraviolet imaging spectrograph results suggest that the atmosphere of Enceladus is not constant and may be consistent with a greater amount of atmospheric gas near the south polar region. The presence of water vapor is more consistent with warm water ice than with magnetospheric sputtering.

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