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TOPIC: Rhea Spot
Blobrana


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RE: Rhea Spot
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This image of Rhea was taken by the Cassini space probe on April 28, 2006 from a distance of approximately 481,625 kilometres away.



The image was taken using the CL1 and UV3 filters.

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Blobrana


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This image of Rhea was taken by the Cassini spacecraft on March 22, 2006 and received on Earth March 23, 2006, when it was approximately 750,991 kilometres away.



The image was taken using the CL1 and GRN filters.

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Blobrana


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This image of Rhea was taken on February 24, 2006 when the Cassini spaceprobe was approximately 342,474 kilometres away.


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The image was taken using the P120 and UV3 filters.

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Blobrana


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This image was taken by the Cassini spaceprobe of Rhea on February 23, 2006 when it was approximately 924,780 kilometres away.


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The image was taken using the CL1 and GRN filters.

-- Edited by Blobrana at 17:37, 2006-02-24

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Blobrana


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This false-colour view highlights and enhances colour variations across the cratered and cracked surface of Saturn's moon Rhea.


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To create the false-colour view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional colour differences. This "colour map" was then superposed over a clear-filter image. The origin of the colour differences is not yet understood, but it may be caused by subtle differences in the surface composition or grain sizes making up the icy soil.

This view shows terrain on the trailing hemisphere of Rhea. North is up.
The images were taken using the Cassini spacecraft narrow-angle camera on January 18, 2006, at a distance of approximately 268,000 kilometres from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 115 degrees. Image scale is 2 kilometres per pixel.

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Blobrana


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Rhea
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Bright, wispy markings stretch across a region of darker terrain on Saturn's moon Rhea. In this extreme false-colour view, the roughly north-south fractures occur within strips of material, (which appear greenish here) that are a different colour from the surrounding cratered landscape.


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To create the false-colour view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional colour differences. Most of the large-scale variations in brightness across the surface are removed by this process. This "colour map" was then superimposed over a clear-filter image.

The origin of the colour differences is not yet understood, but it may be caused by subtle differences in the surface composition or grain sizes making up the icy soil.
Wispy markings were seen on the trailing hemispheres of both Rhea and Dione in images taken by the Voyager spacecraft, and were hypothesised by some researchers to be the result of material extruded onto the surface by ice volcanism. Cassini's earlier revelation of the braided fractures on Dione led to speculation that Rhea's wisps might also be created by fractures.
This view shows terrain on the trailing hemisphere of Rhea. North is up.
The image was taken using the Cassini spacecraft narrow-angle camera on Jan. 17, 2006, at a distance of approximately 245,000 kilometres from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 30 degrees. Image scale is 1 kilometre per pixel.

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Blobrana


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This close view of Rhea prominently shows two large impact basins on the ancient and battered moon. The great age of these basins is suggested by the large number of smaller craters that are overprinted within them.


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Ejecta from the bright, relatively young crater seen here spreads from the eastern limb.
Terrain visible in this view is on the side of Rhea (1,528 kilometres across) that faces away from Saturn. North on Rhea is up and tilted 30 degrees to the left.
This enhanced colour view was created by combining images taken using filters sensitive to ultraviolet, visible green and infrared light.

The images were taken with the Cassini spacecraft narrow-angle camera on Dec. 23, 2005, at a distance of approximately 341,000 kilometres from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 42 degrees. The image scale is 2 kilometres per pixel.

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Blobrana


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Rhea Map
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This global digital map of Saturn's moon Rhea was created using data taken during Cassini and Voyager spacecraft flybys. The map is an equidistant projection and has a scale of 667 meters per pixel.


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The mean radius of Rhea used for projection of this map is 764 kilometres. The resolution of the map is 20 pixels per degree.


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Blobrana


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Saturn's cratered, icy moon, Rhea, comes alive with vibrant colour that reveals new information about the surface properties.

To create this false-colour view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional colour differences. This "colour map" was then superimposed over a clear-filter image of the moon.


Credit: NASA/JPL/Space Science Institute

The combination of colour map and brightness image shows how the colours vary across the moon's surface in relation to geologic features. The origin of the colour differences is not yet understood, but may be caused by subtle differences in the surface composition or the sizes of grains making up the icy soil.

Images in the two-image mosaic were acquired on Aug. 1, 2005, at a mean distance of 214,700 kilometres from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 88 degrees. Image scale is 1.3 kilometres per pixel.
The mosaic shows terrain on the trailing hemisphere of Rhea 1,528 kilometres across, and is centred on 42 degrees south latitude. North is up and rotated 28 degrees to the left.

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Blobrana


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Craters within craters cover the scarred face of Saturn's moon Rhea in this oblique, high-resolution view of terrain on the moon's western hemisphere.


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A large, degraded crater lies at the centre, filled with rolling mounds and many smaller craters. A couple of linear depressions are visible in the terrain (especially at lower right), possibly marking tectonic faults. The crater is about 90 kilometres-wide and is located at 8.5 degrees south latitude, 154.9 west longitude. The moon's icy regolith, or loose surface material, has likely been pummelled into a fine powder over the eons.

This is one of the highest-resolution images of Rhea's surface obtained during Cassini's close flyby on Nov. 26, 2005, during which the spacecraft swooped to within 500 kilometres of the large moon.
The clear filter image was acquired with the wide-angle camera at an altitude of 620 kilometres above Rhea. Image scale is about 85 meters per pixel.

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