Berkas:PIA00844 NIMS spectra.gif

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Ringkasan

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

Deskripsi
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.
Tanggal
Sumber http://photojournal.jpl.nasa.gov/catalog/PIA00844
Pembuat NASA / JPL
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4 November 1996

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Tanggal/WaktuMiniaturDimensiPenggunaKomentar
terkini4 Maret 2010 11.10Miniatur versi sejak 4 Maret 2010 11.102.528 × 2.036 (66 KB)WolfmanSFminor touch-up (add color to pixels accidentally left white)
4 Maret 2010 10.37Miniatur versi sejak 4 Maret 2010 10.372.528 × 2.036 (66 KB)WolfmanSFIncrease linear pixel density of image by a factor of 4; change text and numerals to a larger size (Arial) font
2 Maret 2010 18.31Miniatur versi sejak 2 Maret 2010 18.31632 × 509 (10 KB)WolfmanSFChange Asgard spectrum line from black to blue.
2 Maret 2010 10.28Miniatur versi sejak 2 Maret 2010 10.28632 × 509 (10 KB)WolfmanSFIncrease size of dark red dots to 3 x 3 pixels.
2 Maret 2010 09.50Miniatur versi sejak 2 Maret 2010 09.50632 × 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

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