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Published January 2004 | public
Journal Article

The Cassini Ultraviolet Imaging Spectrograph Investigation


The Cassini Ultraviolet Imaging Spectrograph (UVIS) is part of the remote sensing payload of the Cassini orbiter spacecraft. UVIS has two spectrographic channels that provide images and spectra covering the ranges from 56 to 118 nm and 110 to 190 nm. A third optical path with a solar blind CsI photocathode is used for high signal-to-noise-ratio stellar occultations by rings and atmospheres. A separate Hydrogen Deuterium Absorption Cell measures the relative abundance of deuterium and hydrogen from their Lyman-α emission. The UVIS science objectives include investigation of the chemistry, aerosols, clouds, and energy balance of the Titan and Saturn atmospheres; neutrals in the Saturn magnetosphere; the deuterium-to-hydrogen (D/H) ratio for Titan and Saturn; icy satellite surface properties; and the structure and evolution of Saturn's rings.

Additional Information

© 2004 Kluwer Academic Publishers. Received 8 July 1999; Accepted in final form 18 October 2000. This work was supported by the National Aeronautics and Space Administration under JPL Contract 961196. The Hydrogen Deuterium Absorption Cell (HDAC) was designed and constructed with support from the Max-Planck-Gesellschaft zur Foerderung der Wissenschaften. Grants were received from the DLR under FKZ 50 OH 9201 7. The authors thank Sushil Atreya and an anonymous reviewer for their helpful comments. This revised version was published online in July 2005 with a corrected cover date.

Additional details

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October 17, 2023