File:Global Temperature Map for Exoplanet HD 189733b.jpg
原始檔案 (3,000 × 2,400 像素,檔案大小:2.19 MB,MIME 類型:image/jpeg)
摘要
描述Global Temperature Map for Exoplanet HD 189733b.jpg |
English: This is the first-ever map of the surface of an exoplanet, or a planet beyond our solar system. The map, which shows temperature variations across the cloudy tops of a gas giant called HD 189733b, is made from infrared data taken by NASA's Spitzer Space Telescope. Hotter temperatures are represented in brighter colors.
HD 189733b is what is known as a hot-Jupiter planet. These sizzling, gas planets practically hug their stars, orbiting at distances that are much closer than Mercury is to our sun. They whip around their stars quickly; for example, HD 189733b completes one orbit in just 2.2 days. Hot Jupiters are also thought to be tidally locked to their stars, just as our moon is to Earth. This means that one side of a hot Jupiter always faces its star. As predicted, the map reveals that HD 189733b has a warm spot on its "sunlit" side, which is always pointed toward the star. But the map also shows that this spot is offset from the high-noon, or sun-facing, point by 30 degrees. According to scientists, ferocious winds traveling up to 6,000 miles per hour (nearly 9,700 kilometers per hour) are probably pushing the hot spot to the east. In addition to the warm spot, the map tells astronomers that temperatures on HD 189733b are fairly even all around. While the dark side is about 1,200 degrees Fahrenheit (650 degrees Celsius), the sunlit side is just a bit hotter at 1,700 degrees Fahrenheit (930 degrees Celsius). This mild temperature variation is more evidence for strong winds, since winds would help spread the heat from the hot, sunlit side over to the dark side. These data were collected by Spitzer's infrared array camera as the planet, a so-called transiting planet, passed in front of its star, then swung around and disappeared behind it (see animation). By observing the planet for half of its 2.2-day long orbit, Spitzer was able to measure the infrared light, or heat, coming from its entire surface. |
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來源 | http://www.spitzer.caltech.edu/images/1796-ssc2007-09a-First-Map-of-an-Alien-World |
作者 | NASA/JPL-Caltech/H. Knutson (Harvard-Smithsonian CfA) |
Image use policy: http://www.spitzer.caltech.edu/info/18-Image-Use-Policy
授權條款
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 | 2011年6月14日 (二) 21:14 | 3,000 × 2,400(2.19 MB) | Spitzersteph |
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作者 | Spitzer Space Telescope |
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版權所有人 | http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml |
影像標題 |
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簡稱 |
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製作/提供者 | NASA/JPL-Caltech/H. Knutson (Harvard-Smithsonian CfA) |
標題 | This is the first-ever map of the surface of an exoplanet, or a planet beyond our solar system. The map, which shows temperature variations across the cloudy tops of a gas giant called HD 189733b, is made up of infrared data taken by NASA's Spitzer Space Telescope. |
來源 | Spitzer Space Telescope |
使用條款 |
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資料產生的日期時間 | 2007年5月9日 (星期三) |
寬度 | 3,000 px |
高度 | 2,400 px |
每像素位元 |
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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 | 300 dpi |
垂直解析度 | 300 dpi |
資料排列 | 矮胖格式 |
使用軟體 | Adobe Photoshop CS3 Macintosh |
檔案修改日期時間 | 2009年6月5日 (五) 14:54 |
色彩空間 | 顏色未校準 |
聯絡資訊 |
http://www.spitzer.caltech.edu 1200 E. California Blvd. Pasadena, CA, 91125 USA |
關鍵字 | HD 189733b |
IIM 版本 | 2 |