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TOPIC: Rhea Spot


L

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RE: Rhea south pole
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Cassini looked upwards towards the South Polar Region on Rhea during a recent flyby. Rhea's icy surface is so heavily saturated with impact craters that the moon's limb, or edge, has a rugged, bumpy appearance.
The bright splotch seen here near the upper right is impact material (or ejecta) from a relatively fresh crater.


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The image was taken with the Cassini spacecraft narrow-angle camera on July 14, 2005, at a distance of approximately 342,000 kilometres from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 36 degrees.
The image was obtained using a filter sensitive to wavelengths of infrared light centred at 298 nanometres. The image scale is 2 kilometres per pixel.

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L

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RE: Rhea
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This image was taken on August 01, 2005 and received on Earth August 02, 2005. The camera was pointing toward Rhea that was approximately 230,249 kilometres away.
The image was taken using the CL1 and GRN filters.


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L

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RE: Rhea Spot
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This view of Saturn's moon Rhea shows the bright rays from an impact that covers much of the moon's leading hemisphere.
Rhea is 1,528 kilometres across.
North on Rhea is up in this view.


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The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on June 25, 2005, at a distance of approximately 1.1 million kilometres from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of less than one degree. Resolution in the original image was 7 kilometres per pixel.
The image has been contrast-enhanced and magnified by a factor of two to aid visibility.


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L

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RE: Rhea July 15 2005
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This image was taken on July 14, 2005 and received on Earth July 15, 2005. The camera was pointing toward Rhea approximately 204,829 kilometres away.
The image was taken using the CL1 and UV3 filters.


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L

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RE: Rhea
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This image was taken by the Cassini spacecraft on July 14, 2005 and received on Earth July 15, 2005.
The camera was pointing toward Rhea at approximately 335,026 kilometres away.
The image was taken using the P60 and MT2 filters.


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L

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Saturn's moon Rhea displays two large impact features here, along the terminator (the boundary between day and night), plus a superb rayed crater to the east. Rhea is 1,528 kilometres across.
The northern basin, named Tirawa, was discovered in Voyager images. This ancient impact site is approximately 360 kilometres across. Another, perhaps larger basin sits to the south of Tirawa and is partly in shadow.



This view shows principally the leading hemisphere on Rhea; north is up and rotated about 10 degrees to the left.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 2, 2005, at a distance of approximately 1.8 million kilometres from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 47 degrees.
Resolution in the original image was 11 kilometres per pixel. The image has been contrast-enhanced and magnified by a factor of two to aid visibility.



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L

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This image was taken by the Cassini spacecraft on June 30, 2005 and received on Earth June 30, 2005.


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The camera was pointing toward Rhea that was approximately 1,376,963 kilometres away. The image was taken using the CL1 and CL2 filters.

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L

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Saturn's brightly sunlit moon Rhea commands the foreground in this image from Cassini. The planet's splendid rings are discernible in the background. Rhea is 1,528 kilometres across.


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The spacecraft was just above the ring-plane when it acquired this image, and thus captured the darkened appearance of the dense B ring when viewed with sunlight filtered through the rings. From this perspective, bright areas in the rings are regions of low density, containing very small particles that effectively scatter light toward Cassini.
North on Rhea is up and rotated about 25 degrees to the left. This view shows principally the anti-Saturn hemisphere on Rhea. The right side of Rhea is overexposed.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 18, 2005, at a distance of approximately 540,000 kilometres from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 110 degrees.
The image scale is 3 kilometres per pixel.


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L

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RE: Rhea Splat
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Saturn's moon Rhea displays one of its more prominent features here: a bright, rayed crater which was seen at much higher resolution in an image taken two weeks earlier.



Rhea is 1,528 kilometres across.
North on Rhea is up and rotated about 65 degrees to the left. This view shows principally the anti-Saturn hemisphere on Rhea.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 27, 2005, at a distance of approximately 2 million kilometres from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 42 degrees.
The image scale is 12 kilometres per pixel.



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L

Posts: 131433
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Rhea Spot
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This spot was first noticed last year by the robot Cassini spacecraft now orbiting Saturn.


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Cassini's flyby of Rhea in April 2005 imaged the spot in great detail.
Astronomers hypothesize that the light-coloured spot is the result of a relatively recent impact on the surface of the icy moon.
The impact that likely created the crater also splashed light-coloured material from the interior onto the darker surface.
Rhea spans 1,500 kilometres across and is the second largest moon of Saturn after Titan.



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Rhea sports several other light coloured surface features that are, as yet, not well understood.


-- Edited by Blobrana at 12:21, 2005-05-30

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