PIA06431: Enceladus Atmosphere -- Star Struck

Enceladus Atmosphere – Star Struck


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.

Background Info:

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 ultraviolet imaging spectrograph was built at, and the team is based at the University of Colorado, Boulder.

For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov . The ultraviolet imaging spectrograph team home page is at http://lasp.colorado.edu/cassini .

Cataloging Keywords:

Name Value Additional Values
Target Enceladus Saturn
System Saturn
Target Type Satellite Planet
Mission Cassini-Huygens
Instrument Host Cassini Orbiter
Host Type Orbiter
Instrument Ultraviolet Imaging Spectrometer (UVIS)
Detector Ultraviolet and Visual Channel
Extra Keywords Atmosphere, Color, Ultraviolet, Water
Acquisition Date
Release Date 2005-07-29
Date in Caption 2005-07-14
Image Credit NASA/JPL/University of Colorado
Source photojournal.jpl.nasa.gov/catalog/PIA06431
Identifier PIA06431