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File:Saturn ring spokes (captured by Cassini).ogv

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Original file (Ogg Theora video file, length 44 s, 1,016 × 1,016 pixels, 888 kbps, file size: 4.69 MB)

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Description
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 2008-11-25
Čeština: 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.
Эрзянь: Сатурнонь B ring раужо салмукстнэ, конат теезь Cassini келейуголсо камерасонть.
Date
Source http://photojournal.jpl.nasa.gov/catalog/PIA11144 (MOV video)
Author NASA/JPL/Space Science Institute
Other versions
  • 21 August 2008 sequence: 7.5 seconds at 300 pixels and low bitrate of 51kbps
  • 19 September 2008 sequence: 7 seconds at 300 pixels and low bitrate of 48kbps
  • 26 September 2008 sequence: 7.5 seconds at 300 pixels and low bitrate of 48kbps
  • 11 October 2008 sequence: 10 seconds at 300 pixels and low bitrate of 39kbps
  • 25 November 2008 sequence: 10 seconds at 300 pixels and low bitrate of 52kbps
  • 21 August 2008 sequence: 7.5 seconds at full size and bitrate of 528kbps
  • 19 September 2008 sequence: 7 seconds at full size and bitrate of 545kbps
  • 26 September 2008 sequence: 7.5 seconds at full size and bitrate of 471kbps
  • 11 October 2008 sequence: 10 seconds at full size and bitrate of 470kbps
  • 25 November 2008 sequence: 10 seconds at full size and bitrate of 372kbps
  • All five sequences together at full 1016×1016 pixels size: length 44s, 1,888kbps

Assessment

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Media of the day This file was selected as the media of the day for 7 May 2020. It was captioned as follows:
English: Dark spokes dance around Saturn's B ring in this series of movies comprised of images taken with Cassini's wide-angle camera.
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.
Эрзянь: Сатурнонь B ring раужо салмукстнэ, конат теезь Cassini келейуголсо камерасонть.
Polski: Ciemne plamy na pierścieniu B Saturna zarejestrowane przez kamerę szerokokątną sondy Cassini-Huygens.

Licensing

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Public domain 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/TimeThumbnailDimensionsUserComment
current20:25, 9 October 200944 s, 1,016 × 1,016 (4.69 MB)Tryphon (talk | contribs){{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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Format Bitrate Download Status Encode time
VP9 720P 235 kbps Completed 20:05, 18 October 2018 23 s
VP9 480P 106 kbps Completed 20:05, 18 October 2018 15 s
VP9 360P 55 kbps Completed 20:05, 18 October 2018 9.0 s
VP9 240P 31 kbps Completed 20:05, 18 October 2018 8.0 s
WebM 360P 371 kbps Completed 06:58, 11 November 2012 12 s
QuickTime 144p (MJPEG) Not ready Unknown status

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