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A new view of Enceladus. A global infrared mosaic of Saturn's moon Enceladus created using a complete dataset from the Cassini spacecraft has revealed new detail on the moon's surface. Cassini orbited Saturn and its moons from 2004 to 2017. The mission ended when the spacecraft was intentionally plunged into the planet's atmosphere, but new discoveries are still being made with the data. During the mission lifetime, Cassini flew by Enceladus 147 times, with 23 close encounters of the icy moon. The Visual and Infrared Mapping Spectrometer (VIMS) collected data that can be used to reveal information on the temperature and composition of the surface, as well as the sizes and crystallinity of ice grains. A study published in Icarus has produced a global spectral mosaic using the complete VIMS dataset. The full-colour images were created by combining three IR channels of the VIMS spectro-imager, represented here by red, green, and blue colours, and overlapping these on a mosaic created using the Imaging Science Subsystem on Cassini by another team. The image shows five infrared views of Enceladus centred on the leading side, the Saturn-facing side, and the trailing side in the top row, and the North and South Pole in the bottom row. Click here for an annotated version. The globe can also be explored interactively. The scientists used a photometric correction to reveal new details on the surface of the moon. Enceladus has a surface composed almost of pure water ice, which makes it highly reflective, but the observed brightness depends on the properties of the surface material, the surface shape, and the angle at which it is viewed. Correcting for these variations was necessary to show the differences in composition and physical state at the surface. By using these improved photometric corrections, the scientists have been able to reveal spectral variations whiCredit: ESA / eyevine Contact eyevine for more information about using this image: T: +44 (0) 20 8709 8709
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2020-09-23
ESA / eyevine/Eyevine/East News
Eyevine
ESA / eyevine
EV_A_new_view_of_Enceladus
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