File:PIA00844 NIMS spectra.gif

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Original file (2,528 × 2,036 pixels, file size: 66 KB, MIME type: image/gif)

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Summary

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Galileo spacecraft near infrared spectra of a cratered plains area and the Asgard impact basin on Callisto (from NASA Planetary Photojournal [1])

Description
English: The Near Infrared Mapping Spectrometer (NIMS) acquired this global mosaic (right) at a spatial resolution of 100 km during Galileo's third orbit on November 4, 1996, roughly 7.5 hours prior to Callisto closest approach.

The lighter bluish area in the upper latitudes is the Asgard multi-ring structure (the second largest surface feature on Callisto) with crater Burr to the north and Tornasuk to the east. The bluish color indicates regions with more exposed water ice while the reddish/rusty color indicates surface areas rich in non-ice minerals.

Compare the two spectra:

The Asgard spectrum shows a higher abundance of ice between 1 and 2 microns.

The dark terrain spectrum shows more "rocky" material and less ice.

The Jet Propulsion Laboratory, Pasadena, CA manages the mission for NASA's Office of Space Science, Washington, DC.

The original NASA figure has been modified by inverting white and black, tripling the linear dimensions of the dots in the dark terrain spectrum, coloring these dots red, coloring the Asgard spectrum line blue, increasing the linear pixel density of the image by a factor of 4, and changing the text and numerals to a larger size (Arial) font.
Français : Spectre de réflexion dans le proche infrarouge acquis par Galileo en novembre 1996, avec une résolution spatiale d'environ 100 km. Le spectre du cratère Asgard (trait plein) montre, dans les longueurs d'onde 1-2 µm, une abondance de glace d'eau. Celui des terrains sombres (en pointillé) est typique de matériaux rocheux pauvres en glace.
Date
Source http://photojournal.jpl.nasa.gov/catalog/PIA00844
Author NASA / JPL
Other versions
  • dark terrain spectrum only
    dark terrain spectrum only
  • Korean version
    Korean version

Licensing

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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File history

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Date/TimeThumbnailDimensionsUserComment
current11:10, 4 March 2010Thumbnail for version as of 11:10, 4 March 20102,528 × 2,036 (66 KB)WolfmanSF (talk | contribs)minor touch-up (add color to pixels accidentally left white)
10:37, 4 March 2010Thumbnail for version as of 10:37, 4 March 20102,528 × 2,036 (66 KB)WolfmanSF (talk | contribs)Increase linear pixel density of image by a factor of 4; change text and numerals to a larger size (Arial) font
18:31, 2 March 2010Thumbnail for version as of 18:31, 2 March 2010632 × 509 (10 KB)WolfmanSF (talk | contribs)Change Asgard spectrum line from black to blue.
10:28, 2 March 2010Thumbnail for version as of 10:28, 2 March 2010632 × 509 (10 KB)WolfmanSF (talk | contribs)Increase size of dark red dots to 3 x 3 pixels.
09:50, 2 March 2010Thumbnail for version as of 09:50, 2 March 2010632 × 509 (10 KB)WolfmanSF (talk | contribs){{Information |Description=The Near Infrared Mapping Spectrometer (NIMS) acquired this global mosaic (right) at a spatial resolution of 100 km during Galileo's third orbit on November 4, 1996, roughly 7.5 hours prior to Callisto closest approach. The ligh

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