File:Galilean satellite triple conjunction 2015-01-24.jpg
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摘要[編輯]
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) | |||
來源 | 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 |
本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zh,NASA版權政策或JPL圖像使用政策) | ||
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目前 | 2015年2月7日 (六) 23:00 | 2,000 × 1,000(1.02 MB) | WolfmanSF(留言 | 貢獻) | User created page with UploadWizard |
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寬度 | 1,000 px |
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高度 | 1,000 px |
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壓縮方式 | LZW |
像素合成 | RGB |
方位 | 標準 |
像素數量 | 3 |
水平解析度 | 72 dpi |
垂直解析度 | 72 dpi |
資料排列 | 矮胖格式 |
使用軟體 | Adobe Photoshop Elements 12.0 Macintosh |
檔案修改日期時間 | 2015年2月7日 (六) 12:31 |
Exif 版本 | 2.21 |
色彩空間 | sRGB |
詮釋資料最後修改日期 | 2015年2月7日 (六) 04:31 |
數位化的日期時間 | 2015年2月7日 (六) 04:26 |
原始文件唯一識別碼 | xmp.did:767D3918392068118083DF440090DADA |