File:Galilean satellite triple conjunction 2015-01-24.jpg
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描述Galilean satellite triple conjunction 2015-01-24.jpg |
English: Firing off a string of snapshots like a sports photographer at a NASCAR race, NASA's Hubble Space Telescope captured a rare look at three of Jupiter's largest moons parading across the banded face of the gas-giant planet: Europa, Callisto, and Io.
These so-called Galilean satellites (named after the 17th century scientist Galileo Galilei, who discovered them with a telescope) complete orbits around Jupiter ranging from 2 days to 17 days in duration. They can commonly be seen transiting the face of Jupiter and casting shadows onto its cloud tops. However, seeing three moons transiting the face of Jupiter at the same time is rare, occurring only once or twice a decade. The Hubble image on the left shows the beginning of the event, which took place on January 24, 2015. From left to right the moons Callisto and Io are above Jupiter's cloud tops. The shadows from Europa (not seen in the image), Callisto, and Io are strung out from left to right. Near the end of the event, approximately 42 minutes later (right-side image), Europa has entered the frame at lower left. Slower-moving Callisto is above and to the right of Europa. Fastest-moving Io is approaching the eastern limb of the planet; its shadow is no longer visible on Jupiter. Europa's shadow is toward the left side of the image, and Callisto's shadow to the right. (The moons' orbital velocities are proportionally slower with increasing distance from the planet.) Missing from the sequence is the moon Ganymede, which was outside Hubble's field of view and too far from Jupiter in angular separation to be considered part of the conjunction. The moons in these photos have distinctive colors. The ancient, cratered surface of Callisto is brownish; the smooth icy surface of Europa is yellow-white; and the volcanic, sulfur-dioxide surface of Io is orange. The apparent "fuzziness" of some of the shadows depends on the moons' distances from Jupiter. The farther away a moon is from the planet, the softer the shadow, because the shadow is more spread out across the disk. The images were taken with Hubble's Wide Field Camera 3 in visible light. |
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日期 | (released 5 February 2015) | |||
来源 | http://hubblesite.org/newscenter/archive/releases/2015/05/image/b/ and http://hubblesite.org/newscenter/archive/releases/2015/05/image/c/ (see also http://heritage.stsci.edu/2015/05/index.html) | |||
作者 | NASA, ESA, and the Hubble Heritage Team (STScI/AURA) | |||
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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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宽度 | 1,000 px |
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高度 | 1,000 px |
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压缩方案 | LZW |
像素构成 | RGB |
方位 | 标准 |
像素数 | 3 |
水平分辨率 | 72 dpi |
垂直分辨率 | 72 dpi |
数据排列 | chunky format |
使用软件 | Adobe Photoshop Elements 12.0 Macintosh |
文件修改日期时间 | 2015年2月7日 (六) 12:31 |
Exif版本 | 2.21 |
色彩空间 | sRGB |
原始数据最后修改日期 | 2015年2月7日 (六) 04:31 |
数字化日期时间 | 2015年2月7日 (六) 04:26 |
原始文件唯一ID | xmp.did:767D3918392068118083DF440090DADA |