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Summary
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English: Dark spokes dance around Saturn's B ring in this series of movies comprised of images taken with Cassini's wide-angle camera.
This animation is a concatenation of spoke movies acquired by NASA's Cassini spacecraft in the second half of 2008 on Aug. 21, Sept. 19, Sept. 26, Oct. 11, and Nov. 25. As Saturn nears equinox in August 2009 and the sun angle on the ring plane decreases, spokes become common sights in Cassini images, just as they were in Voyager images. The planet's orbital period is 29.5 years, so Saturn has nearly made one complete trip around the sun since the flybys of the two Voyager spacecraft in 1980 and 1981, allowing Cassini to closely match Voyager's viewing geometry. Each of these five movies shows the sunlit side of the rings at low solar phase, or spacecraft-rings-sun, angles. The spokes appear dark against Saturn's B ring at low phase angles because the particles within them scatter light more efficiently in the forward direction (away from Cassini) than the surrounding larger ring particles. In the opposite viewing geometry, at high phase angles, spokes appear bright relative to surrounding ring particles. 2008-08-21, 2008-09-19, 2008-09-26, 2008-10-11 and 2008-11-25Čeština: Tmavé skvrny se pohybují po Saturnově prstenci B v serii spojených snímků širokoúhlé kamery sondy Cassini.
Polski: Ciemne plamy na pierścieniu B Saturna zarejestrowane przez kamerę szerokokątną sondy Cassini-Huygens.
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| Source | http://photojournal.jpl.nasa.gov/catalog/PIA11144 (MOV video) |
| Author | NASA/JPL/Space Science Institute |
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Assessment
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This file was selected as the media of the day for 7 May 2020. It was captioned as follows:
Other languages
Čeština: Tmavé skvrny se pohybují po Saturnově prstenci B v serii spojených snímků širokoúhlé kamery sondy Cassini. English: Dark spokes dance around Saturn's B ring in this series of movies comprised of images taken with Cassini's wide-angle camera. Polski: Ciemne plamy na pierścieniu B Saturna zarejestrowane przez kamerę szerokokątną sondy Cassini-Huygens.
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Licensing
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:25, 9 October 2009 | 44 s, 1,016 × 1,016 (4.69 MB) | Tryphon | {{Information |Description=Dark spokes dance around en:Saturn's B ring in this series of movies comprised of images taken with en:Cassini's wide-angle camera. This animation is a concatenation of spoke movies acquired by NASA's Cassini spacec |
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