Pits along Fractures in Crater Floor Material
NASA/JPL/UArizona
Pits along Fractures in Crater Floor Material
ESP_017103_2255  Science Theme: Landscape Evolution
This image shows the degraded rim of a large impact crater which is partly filled with material that is fractured in several places, especially near the crater rim.

Pits of various sizes have formed along most of the fractures, and some of the pits have merged into elongated depressions. The association of the pits with the fractures suggests that the pits were formed by removal of material deep within the fractures. A plausible reason for the formation of these features is that the crater floor material includes substantial ground ice. When the fractures open, perhaps due to glacial-like flow of the ice-rich floor material toward the center of the crater, water ice is exposed to the Martian atmosphere.

The ice then evaporates into the dry atmosphere, enlarging the fracture at depth. As the icy "cave" grows, ice-free material near the surface collapses into the cave, forming the pits we see here.



Written by: Ken Herkenhoff  (5 May 2010)

This is a stereo pair with ESP_018092_2255.
 
Acquisition date
21 March 2010

Local Mars time
15:00

Latitude (centered)
44.988°

Longitude (East)
57.365°

Spacecraft altitude
299.9 km (186.4 miles)

Original image scale range
30.1 cm/pixel (with 1 x 1 binning) so objects ~90 cm across are resolved

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25 cm/pixel and North is up

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Equirectangular

Emission angle
5.6°

Phase angle
37.1°

Solar incidence angle
43°, with the Sun about 47° above the horizon

Solar longitude
66.8°, Northern Spring

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North azimuth:  96°
Sub-solar azimuth:  348.9°
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POSTSCRIPT
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.