File:PIA00844 NIMS spectra.gif

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Summary

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

DescriptionPIA00844 NIMS spectra.gif	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	4 November 1996
Source	http://photojournal.jpl.nasa.gov/catalog/PIA00844
Author	NASA / JPL
Other versions	dark terrain spectrum only Korean version

Licensing

	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.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[2] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [3] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [4] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	11:10, 4 March 2010	2,528 × 2,036 (66 KB)	WolfmanSF	minor touch-up (add color to pixels accidentally left white)
	10:37, 4 March 2010	2,528 × 2,036 (66 KB)	WolfmanSF	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 2010	632 × 509 (10 KB)	WolfmanSF	Change Asgard spectrum line from black to blue.
	10:28, 2 March 2010	632 × 509 (10 KB)	WolfmanSF	Increase size of dark red dots to 3 x 3 pixels.
	09:50, 2 March 2010	632 × 509 (10 KB)	WolfmanSF	{{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