File:PIA09813_Epimetheus_S._polar_region.jpg
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PIA09813_Epimetheus_S._polar_region.jpg (600 × 580像素,文件大小:153 KB,MIME类型:image/jpeg)
摘要
描述PIA09813 Epimetheus S. polar region.jpg |
The Cassini spacecraft's close flyby of Epimetheus in December 2007 returned detailed images of the moon's south polar region. The view shows what might be the remains of a large impact crater covering most of this face, and which could be responsible for the somewhat flattened shape of the southern part of Epimetheus (116 kilometers, or 72 miles across) seen previously at much lower resolution. The image also shows two terrain types: darker, smoother areas, and brighter, slightly more yellowish, fractured terrain. One interpretation of this image is that the darker material evidently moves down slopes, and probably has a lower ice content than the brighter material, which appears more like "bedrock." Nonetheless, materials in both terrains are likely to be rich in water ice. The images that were used to create this enhanced color view were taken with the Cassini spacecraft narrow-angle camera on Dec. 3, 2007. The views were obtained at a distance of approximately 37,400 kilometers (23,000 miles) from Epimetheus and at a Sun-Epimetheus-spacecraft, or phase, angle of 65 degrees. Image scale is 224 meters (735 feet) per pixel. The Cassini–Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo. For more information about the Cassini–Huygens mission visit http://saturn.jpl.nasa.gov/home/index.cfm. The Cassini imaging team homepage is at http://ciclops.org. The NASA image has been cropped. |
日期 | |
来源 | http://photojournal.jpl.nasa.gov/catalog/PIA09813 |
作者 | NASA/JPL/Space Science Institute |
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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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说明
3 12 2007
文件历史
点击某个日期/时间查看对应时刻的文件。
日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
---|---|---|---|---|---|
当前 | 2013年1月5日 (六) 22:49 | ![]() | 600 × 580(153 KB) | Antonsusi | Turn back ok, but the margin makes only a smaller, not optimised visible size of the object on pages. |
2012年12月19日 (三) 07:59 | ![]() | 680 × 640(222 KB) | WolfmanSF | Reverted to version as of 17:18, 11 January 2008 - Solar System objects are normally portrayed with north up, which means solar illumination comes from the side; also, there's no artistic advantage to eliminating the margin | |
2011年1月9日 (日) 02:39 | ![]() | 580 × 600(146 KB) | Antonsusi | cropped, turned upright | |
2008年1月11日 (五) 17:18 | ![]() | 680 × 640(222 KB) | WolfmanSF | replace with processed NASA image |
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