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

Saturn_ring_spokes_PIA11144_300px_secs15.5to23_20080926.ogv （Ogg Theora视频文件，长度7.5秒，300 × 300像素，52 kbps，文件大小：47 KB）

描述

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 2008年9月26日: 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.
日期 2008年9月26日
来源 http://photojournal.jpl.nasa.gov/catalog/PIA11144 (MOV video)
作者 NASA/JPL/Space Science Institute
其他版本
  • 2008年8月21日 sequence: 7.5 seconds at 300 pixels and low bitrate of 51kbps
  • 2008年9月19日 sequence: 7 seconds at 300 pixels and low bitrate of 48kbps
  • 2008年9月26日 sequence: 7.5 seconds at 300 pixels and low bitrate of 48kbps
  • 2008年10月11日 sequence: 10 seconds at 300 pixels and low bitrate of 39kbps
  • 2008年11月25日 sequence: 10 seconds at 300 pixels and low bitrate of 52kbps
  • 2008年8月21日 sequence: 7.5 seconds at full size and bitrate of 528kbps
  • 2008年9月19日 sequence: 7 seconds at full size and bitrate of 545kbps
  • 2008年9月26日 sequence: 7.5 seconds at full size and bitrate of 471kbps
  • 2008年10月11日 sequence: 10 seconds at full size and bitrate of 470kbps
  • 2008年11月25日 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 本文件完全由NASA创作，在美国属于公有领域。根据NASA的版权方针，NASA的材料除非另有声明否则不受版权保护。（参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。）
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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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