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The Bruce Murray Space Image Library

Titan, Dione, rings, Prometheus

Filed under Dione, pretty pictures, Cassini, Titan, amateur image processing, Saturn's small moons, global views, Saturn's moons, many worlds, Saturn's rings

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Titan, Dione, rings, Prometheus Cassini captured the three images for this approximately true color composite on October 18, 2010. While Cassini studied Titan, the mid-sized icy moon Dione wandered through the field of view, while Prometheus sat atop the F ring at upper left.

NASA / JPL-Caltech / SSI / color composite by Emily Lakdawalla

A Cassini color image without alignment

NASA / JPL-Caltech / SSI / color composite by Emily Lakdawalla

A Cassini color image without alignment
Three images taken through red, green, and blue filters on October 18, 2010 were combined into a color composite without any alignment of the individual images. The most obvious problem is with Dione, which clearly moved between red, green, and blue filters, but if you look at upper left you can see the tiny potato shape of Prometheus showing up in only red and green filters and absent entirely from the blue filter image. Less obvious are color channel misalignments among the rings and on Titan; the blue channel is shifted several pixels upward with respect to the red and green channels, resulting in a blue halo above Titan and the rings and a yellow and green halo below them.

Original image data dated on or about October 18, 2010.

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. For uses not allowed by that license, contact us to request publication permission from the copyright holder: Emily Lakdawalla


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