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Mars Express Sees Coprates Chasma and Catena

June 10, 2005

ESA — These images, taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft, show Coprates Chasma, a major trough in the Valles Marineris canyon system.

The HRSC obtained these images during orbit 449 with a ground resolution of approximately 48 metres per pixel.

The scenes show the region containing the sections of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East, roughly in the centre of the Valles Marineris canyon system.

The trough of Coprates Chasma appears in the north (right-hand side) of the colour image here, and ranges from approximately 60 km to 100 km wide and extends 8-9 km below the surrounding plains.

Coprates Catena lies parallel to Coprates Chasma and can be seen in the south (left) of the image as three troughs, ranging from a few kilometres to 22 km wide and up to 5 km deep. These troughs have been modified by erosion, as indicated by the linear features extending from the upper edge of the trough walls.

In contrast to the relatively sharp appearance of the upper regions of the trough walls, the lower slopes and the floors of the troughs have a softer appearance, which is probably the result of atmospheric dust.

Linear features, prevalent throughout the image and running generally parallel to the major troughs, may be faults.

Scientists are unsure of the mechanism responsible for the creation of the Valles Marineris canyon system. Some suggest that the formation of the Tharsis uplift, located west of the canyon system, caused tension and fracturing of the Martian crust.

Other researchers believe that water may have removed rock material from the subsurface, which caused the surface to collapse. A related theory suggests that large quantities of subsurface ice melted, causing surface collapse. Possibly all of these processes together were active in forming the structure.

Valles Marineris provides scientists with a window into the depths of Mars and enables them to study the complex geological and climatic history of the Red Planet.

By supplying new data for Valles Marineris, including colour and stereo images, the Mars Express HRSC camera aids scientists in this endeavour, ultimately improving our understanding of this fascinating planet.

The colour images were processed using the HRSC nadir (vertical view) and three colour channels. The perspective views were calculated from the digital terrain model derived from the stereo channels.

The 3D anaglyph images were created from the nadir channel and one of the stereo channels. Stereoscopic glasses are needed to view the 3D images Image resolution has been decreased for use on the internet.

Image Captions

Image 1: This image, taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft, shows Coprates Chasma, a major trough located roughly in the centre of the Valles Marineris canyon system.

The HRSC obtained this perspective view on 28 May 2004 during orbit 449 with a ground resolution of approximately 48 metres per pixel. The scene shows the region of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East, looking north.

The main trough, appearing in the north (top half) of this image, ranges from approximately 60 km to 100 km wide and extends 8-9 km below the surrounding plains. Coprates Catena lies parallel to Coprates Chasma and can be seen in the south (lower half) of the image as three smaller troughs, ranging from a few kilometres to 22 km wide and up to 5 km deep.

Image 2: This map shows where the images taken on 28 May 2004 are in relation to the rest of Valles Marineris. They show the region of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East, roughly in the centre of the Valles Marineris canyon system.

Image 3: This image was taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft. The HRSC obtained this image on 28 May 2004 during orbit 449 with a ground resolution of approximately 48 metres per pixel. The scene shows the region of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East.

The trough of Coprates Chasma appears in the north (right-hand side) of the image, and ranges from approximately 60 km to 100 km wide and extends 8-9 km below the surrounding plains. Coprates Catena lies parallel to Coprates Chasma and can be seen in the south (left) of the image as three troughs, ranging from a few kilometres to 22 km wide and up to 5 km deep.

Image 4: This image was taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft. It show Coprates Chasma, a major trough located roughly in the centre of the Valles Marineris canyon system.

The HRSC obtained this image on 28 May 2004 during orbit 449 with a ground resolution of approximately 48 metres per pixel. The scene shows the region of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East.

The trough of Coprates Chasma appears in the north (right-hand side) of the image, and ranges from approximately 60 km to 100 km wide and extends 8-9 km below the surrounding plains. Coprates Catena lies parallel to Coprates Chasma and can be seen in the south (left) of the image as three troughs, ranging from a few kilometres to 22 km wide and up to 5 km deep.

Image 5: The HRSC on ESA’s Mars Express obtained this perspective view on 28 May 2004 during orbit 449 with a ground resolution of approximately 48 metres per pixel. The scene shows the region of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East, looking north-east.

Image 6: This 3D anaglyph image was taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft. It show Coprates Chasma, a major trough located roughly in the centre of the Valles Marineris canyon system.

The HRSC obtained this image on 28 May 2004 during orbit 449 with a ground resolution of approximately 48 metres per pixel. The scene shows the region of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East.

Image 7: The HRSC on ESA’s Mars Express obtained this 3D perspective view on 28 May 2004 during orbit 449 with a ground resolution of approximately 48 metres per pixel. The scene shows the region of Coprates Chasma and Coprates Catena, over an area centred at about 13.5º South and 300º East, looking north.

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