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I canali di Kasei Vallis ripresi da Mars Express

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Offline marcozambi

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I canali di Kasei Vallis ripresi da Mars Express
« il: Lun 04/09/2006, 09:06 »
http://www.esa.int/SPECIALS/Mars_Express/SEMH916LARE_0.html

Kasei Valles outflow channel system
Mars Express European Space Agency 30 August 2006

These images, taken by the High Resolution Stereo Camera (HRSC) on board ESA's Mars Express spacecraft, show the region of Kasei Valles, one of the biggest outflow channel systems on Mars. Kasei is the Japanese word for the planet Mars.

[Kasei Valles, context map]

The HRSC obtained these images during orbit 1429 at a ground resolution of approximately 29 metres per pixel.

The Kasei Valles region lies approximately between 21?? and 28?? North at 292.5?? East.

Connecting the southern Echus Chasma and the plain Chryse Planitia in the East, Kasei Valles has a width of roughly 500 kilometres and, if Echus Chasma is included, extends for approximately 2500 kilometres.

 [Kasei Valles, colour view of Northern branch]

There are two sets of images in this release, one showing the North branch, one showing the South branch. Both branches extend approximately South-West to North-East, and the images have been rotated one-quarter clockwise so that North is to the right.

Both valley branches exhibit a depth of 2900 metres.

 [Kasei Valles, black and white view of Northern branch]

As one of the biggest outflow channel systems on Mars, Kasei Valles was probably formed by gigantic flood events and later additionally shaped by glacial activity.

 [Kasei Valles, perspective view of Northern branch, looking East]

In the first set of images, the Northern branch of Kasei Valles and the plain Sacra Mensa can be seen. An oval structure at the western edge of the scene is interpreted to be a crater caused by an oblique meteorite impact.

 [Kasei Valles, perspective view of Southern branch, looking East]

The Southern branch of Kasei Valles and Sacra Mensa, with its 1- to 2-kilometre-deep graben system, Sacra Fossae, is shown in the second set of images. The terraces are up to 30 kilometres wide, located at the base of the walls on both sides of the valley branch.

 [Kasei Valles, perspective view of Southern branch, looking South-West]

The colour scene was derived from three HRSC-colour channels. The perspective views have been calculated from the digital terrain model derived from the stereo channels. The 3D anaglyph images were derived from the stereo and nadir channels. Image resolution has been decreased for use on the internet.

(See note after last image below for more details.)

 [Kasei Valles, colour view of Southern branch]

[Kasei Valles, black and white view of Southern branch]

 Note:

This image release includes two 3D anaglyph images. See links at right to access these separately.

For more information on Mars Express HRSC images, please read our updated FAQ http://www.esa.int/export/SPECIALS/Mars_Express/SEMJBQXLDMD_0.html
Marco Zambianchi
ForumAstronautico Founder
Presidente Associazione ISAA