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File:Io from Galileo and Voyager missions.jpg

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原始檔案 (11,445 × 3,643 像素,檔案大小:3.27 MB,MIME 類型:image/jpeg


摘要


North Pole Grid

South Pole Grid
PIA09257
Target Name: Io
Is a satellite of: Jupiter
Mission: Galileo mission
Voyager program
Spacecraft: Galileo
Voyager 1
Instrument: Solid-State Imaging
Product Size: 11445 samples x 3643 lines
Produced By: U.S. Geological Survey
Primary Data Set: N/A
Full-Res TIFF: PIA09257.tif (125.1 MB)
Full-Res JPEG: PIA09257.jpg (3.431 MB)

PIA09257: Io in Motion
Io is the most volcanically active body in the Solar System. Volcanoes erupt massive volumes of silicate lava, sulphur and sulphur dioxide, constantly changing Io's appearance. This new basemap of Jupiter's moon Io was produced by combining the best images from both the Voyager 1 and Galileo Missions. Although the subjovian hemisphere of Io was poorly seen by Galileo, superbly detailed Voyager 1 images cover longitudes from 240 W to 40 W and the nearby southern latitudes. A monochrome mosaic of the highest resolution images from both Galileo and Voyager 1 was assembled that includes 51 Voyager 1 images with spatial resolutions sometimes exceeding the 1 km/pixel scale of the final mosaic. Because this mosaic is made up of images taken at various local times of day, care must be taken to note the solar illumination direction when deciding whether topographic features display positive or negative relief. In general, the illumination is from the west over longitudes 40 to 270 W, and from the east over longitudes 270 W to 40 W. Color information was later superimposed from Galileo low phase angle violet, green, and near-infrared (756 nanometer wavelength) images. The Galileo SSI camera's silicon CCD was sensitive to longer wavelengths than the vidicon cameras of Voyager, so that distinctions between red and yellow hues can be more easily discerned. The "true" colors that would be visible to the eye are similar but much more muted than shown here. Image resolutions range from 1 to 10 km/pixel along the equator, with the poorest coverage centered on longitude 50 W.

This mosaic is in an equal area cylindrical map projection, centered onlongitude 180, with grid lines at 30 degree intervals. Full scale versions of this mosaic, and the data products used to generate it, can be obtained from the USGS Astrogeology website, https://astrogeology.usgs.gov/Projects/JupiterSatellites/.

About the Animation

Animation file: Image:Iorotateing1day.ogg

In the same way that the Moon always has the same side facing Earth, Io always has the same side facing Jupiter. The movie shows two speeded-up rotations of Io (a single rotation really takes 1.77 days), and begins with a view of the Jupiter-facing hemisphere. With rotation in an easterly direction, after two seconds the volcano Prometheus (on the equator) comes into view. The massive red deposit around Pele (seconds 5-10) is the most distinctive expression of volcanic activity on Io, and just to the north-west is the horse shoe-shaped Loki Patera, the most powerful volcano on Io.

The animation was made using a computer program that wrapped the Io mosaic around a sphere to produce a globe. In all, 360 images were used, each differing by one degree in longitude from the previous image.


Source: http://photojournal.jpl.nasa.gov/catalog/PIA09257 (direct link)

本圖像或影音收錄於美國國家航空暨太空總署 (NASA)噴射推進實驗室(Jet Propulsion Laboratory),其照片編號為: PIA09257

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Public domain 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/zhNASA版權政策JPL圖像使用政策
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Io's surface presented on a map.

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目前2007年5月5日 (六) 12:27於 2007年5月5日 (六) 12:27 版本的縮圖11,445 × 3,643(3.27 MB)とある白い猫Io (surface map) <table border="0" width="100%"> <caption> <b>PIA09257: Io in Motion</b></caption> <tr> <td align="center"> <a href="/animation/PIA09257"> <img src="/browse/PIA09257.gif" alt="Io in Motion"> </a> <br /> Click on graphic to obtai

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