File:Saturn ring spokes PIA11144 300px secs15.5to23 20080926.ogv

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Saturn_ring_spokes_PIA11144_300px_secs15.5to23_20080926.ogv ‎(Ogg Theora video file, length 7.5 s, 300 × 300 pixels, 52 kbps, file size: 47 KB)

Description

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 from the sequence taken on 26 September 2008: 15.5 to 23 seconds extracted from a concatenation of spoke movies acquired by NASA's Cassini spacecraft.

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.

This movie 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.
Date 26 September 2008
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
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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See File:Saturn ring spokes PIA11144 300px secs0to7.5 20080821.ogv for details of how videos were extracted and converted to Theora OGG format.

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Date/TimeThumbnailDimensionsUserComment
current18:28, 10 November 20097.5 s, 300 × 300 (47 KB)84user{{Information |Description=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 from the sequence taken on
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