File:Infrared_Structure_of_Comet_Holmes.jpg
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原始文件 (3,000 × 2,400像素,文件大小:2.57 MB,MIME类型:image/jpeg)
摘要
描述Infrared Structure of Comet Holmes.jpg |
English: NASA's Spitzer Space Telescope captured the picture on the left of comet Holmes in March 2008, five months after the comet suddenly erupted and brightened a millionfold overnight. The contrast of the picture has been enhanced on the right to show the anatomy of the comet.
Every six years, comet 17P/Holmes speeds away from Jupiter and heads inward toward the sun, traveling the same route typically without incident. However, twice in the last 116 years, in November 1892 and October 2007, comet Holmes mysteriously exploded as it approached the asteroid belt. Astronomers still do not know the cause of these eruptions. Spitzer's infrared picture at left reveals fine dust particles that make up the outer shell, or coma, of the comet. The nucleus of the comet is within the bright whitish spot in the center, while the yellow area shows solid particles that were blown from the comet in the explosion. The comet is headed away from the sun, which lies beyond the right-hand side of the picture. The contrast-enhanced picture on the right shows the comet's outer shell, and strange filaments, or streamers, of dust. The streamers and shell are a yet another mystery surrounding comet Holmes. Scientists had initially suspected that the streamers were small dust particles ejected from fragments of the nucleus, or from hyerpactive jets on the nucleus, during the October 2007 explosion. If so, both the streamers and the shell should have shifted their orientation as the comet followed its orbit around the sun. Radiation pressure from the sun should have swept the material back and away from it. But pictures of comet Holmes taken by Spitzer over time show the streamers and shell in the same configuration, and not pointing away from the sun. The observations have left astronomers stumped. The horizontal line seen in the contrast-enhanced picture is a trail of debris that travels along with the comet in its orbit. The Spitzer picture was taken with the spacecraft's multiband imaging photometer at an infrared wavelength of 24 microns. |
日期 | |
来源 | http://www.spitzer.caltech.edu/images/2742-ssc2008-18a-Anatomy-of-a-Busted-Comet |
作者 | NASA/JPL-Caltech/W. Reach (SSC-Caltech) |
Image use policy: http://www.spitzer.caltech.edu/info/18-Image-Use-Policy
许可协议
Public domainPublic domainfalsefalse |
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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10 10 2008
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高度 | 2,400 px |
压缩方案 | LZW |
像素构成 | RGB |
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像素数 | 3 |
水平分辨率 | 300 dpi |
垂直分辨率 | 300 dpi |
数据排列 | chunky format |
使用软件 | Adobe Photoshop CS4 Macintosh |
文件修改日期时间 | 2009年10月1日 (四) 09:44 |
色彩空间 | 无标定 |