Saturn Shows Off Its Shadow

by Jason Major on September 21, 2012

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Take a look up at the enormous shadow cast by Saturn onto its own rings in this raw image, acquired by NASA’s Cassini spacecraft on September 18, 2012.

Cassini captured this image from below Saturn’s ring plane at a distance of 1,393,386 miles (2,242,437 kilometers). It shows not only the gas giant’s shadow but also the wispy nature of the rings, which, although complex, extensive and highly reflective (the light seen on Saturn above is reflected light from the rings!) they are still very thin — less than a mile (about 1 km) on average and in some places as little as thirty feet (10 meters) thick.

Seen in the right light, some of the thin innermost rings can seem to nearly disappear entirely — especially when backlit by Saturn itself.

Views like the one above are once again possible because of Cassini’s new orbit, which takes it high above and below the ring plane, providing a new perspective for studying Saturn and its moons. Ultimately by next April the spacecraft will be orbiting Saturn at an inclination of about 62 degrees — that’d be like an orbit around Earth that goes from Alaska to the northernmost tip of Antarctica. (Find out how Cassini alters its orbit here.)

With this viewpoint Cassini will get some great views of Saturn’s north and south poles, which are gradually moving into their summer and winter seasons, respectively, during the ringed planet’s 29.5-Earth-year orbital period.

After more than 8 years in orbit Cassini is still fascinating us with enthralling images of Saturn on a regular basis. Read more about the Cassini mission here.

Cassini spots shepherd moons Pan (within the Encke Gap) and Prometheus (along the inner edge of the F ring) in an image acquired on Sept. 18, 2012

Images: NASA/JPL/Space Science Institute.

About 

A graphic designer in Rhode Island, Jason writes about space exploration on his blog Lights In The Dark, Discovery News, and, of course, here on Universe Today. Ad astra!

newSteveZodiac September 21, 2012 at 8:56 AM

Followi the *how* link and NASA refers to Apokrone and Perikrone. OK Kronus or Cronus is the Greek version of Saturn just as Ares is the Greek for Mars but this Greek God nomenclature strikes me as a bit of an affectation. Mercury’s apses would presumably be apoherme and periherme. Venus becomes the rather charming apoaphrodite and periaphrodite although the latter sounds like a disease. Apo/periare.is hard to say which is probably why I can’t find it on the internet Moving out Jupiter has apo/perizeu (a soft drink?) and Uranus remains apo- and periurane (sounds like a plastic). Then it gets more interesting, apo/periposeide and the dark apo/perihades. What about the moons of Jupiter’s apses? No – don’t even go there. Is there a rule for this or do they just make them up?

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