Cratered Cones in Grojta Valles
Cratered Cones in Grojta Valles
ESP_028466_1955  Science Theme: Volcanic Processes
This scene shows a portion of Grojta Valles, a system of channels carved into the equatorial lava plains of Mars.

The floor here includes numerous streamlined landforms. The nature of the flow though the valleys (volcanic or fluvial) is debated, but at this locality the flow unit hosts a series of small cratered cones. These cones are interpreted to be the product of explosive lava-water interactions, indicating that the region is covered by lava.

Moreover, the delicate nature of the cratered cones argues against the passage of subsequent floods across this surface because the small landforms would have been eroded.

Written by: Lazslo Kestay (audio by Tre Gibbs)  (19 September 2012)

This is a stereo pair with ESP_027978_1955.
Acquisition date
22 August 2012

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
279.9 km (173.9 miles)

Original image scale range
28.7 cm/pixel (with 1 x 1 binning) so objects ~86 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
53°, with the Sun about 37° above the horizon

Solar longitude
159.2°, Northern Summer

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  4.3°
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RGB color
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Black & white is 5 km across; enhanced color about 1 km
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NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.