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Cassini In Saturn Orbit
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MIKE BURN
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Joined: 08 Nov 2001
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PostPosted: Sat Jul 17, 2004 7:23 pm    Post subject: Re: New pics Reply with quote



This dramatic view of Saturn’s rings draped by the shadow of Saturn, shows brightness variations that correspond to differences in the concentration of the ring particles as they orbit the planet.

The planet’s western limb is visible in the upper right corner. Three of Saturn’s moons can be seen here: Bright Enceladus (499 kilometers, or 310 miles across) is visible near lower right; Epimetheus (116 kilometers, or 72 miles across) appears at center left; and interior to the F ring, near the top of the image, is Prometheus (102 kilometers, or 63 miles across). The F ring, the outermost ring shown here, displays several knot-like features near the left side of the image.



The image was taken in visible light by the Cassini spacecraft wide angle camera on July 3, 2004, from a distance of 1.5 million kilometers (930,000 miles) from Saturn, at a Sun-Saturn-spacecraft, or phase, angle of about 108 degrees. This is the first processed wide angle camera image to be released since Cassini’s encounter with Jupiter in 2000. The image scale is 87 kilometers (54 miles) per pixel.







Saturn’s captivating cloud bands display a number of interesting features in this narrow angle camera image taken by the Cassini spacecraft on May 20, 2004. On close inspection, the sub-equatorial bands at around 20 degrees south latitude have a braided rope-like appearance. Also noteworthy are swirls and vortices around 60 degrees south latitude. The moon Mimas (398 kilometers, or 247 miles across) is visible just below and to the right of Saturn’s South Pole.

The image was taken when Cassini was 22 million kilometers (13.7 million miles) from Saturn through a filter centered at 727 nanometers. The image scale is 131 kilometers (81 miles) per pixel. Contrast in the image was enhanced to aid visibility.







Saturn's Two-Face Moon (Iapetus)



The moon with the split personality, Iapetus, presents a puzzling appearance. One hemisphere of the moon is very dark, while the other is very bright. Whether the moon is being coated by foreign material or being resurfaced by material from within is not yet known.

Iapetus' diameter is about one third that of our own moon at 1,436 kilometers (892 miles). The latest image was taken in visible light with the Cassini spacecraft narrow angle camera on July 3, 2004, from a distance of 3 million kilometers (1.8 million miles) from Iapetus (pronounced eye-APP-eh-tuss).



The brightness variations in this image are not due to shadowing, they are real. The face of Iapetus visible was observed at a Sun-Iapetus-spacecraft, or phase, angle of about 10 degrees. The image scale is 18 kilometers (11 miles) per pixel. The image was magnified by a factor of two to aid visibility.


MIKE


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