Gullies and Craters on the Floor of Newton Basin
NASA/JPL/University of Arizona
Gullies and Craters on the Floor of Newton Basin
PSP_002620_1410  Science Theme: Fluvial Processes
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This image shows a portion of two impact craters on the floor of Newton Basin where a smaller crater formed within a earlier larger one. The larger crater's north rim can be seen diagonally (southwest-northeast) across the image and the smaller crater's north rim is near the bottom of the image.

Several gullies are incised along the interior wall of the larger crater. These gullies start near the top of the wall and can be traced across a break in slope partway down the wall (see subimage, 750 meters across). This break in slope occurs along the entire portion of the crater wall, and appear shallower just above the break in slope, and deeper below the slope break. This suggests that the fluid which eroded and carved out the wall materials forming the gullies, increased in velocity after the slope break, creating a deeper section.

Written by: Kelly Kolb  (5 July 2007)

This is a stereo pair with PSP_002686_1410.
 
Acquisition date
16 February 2007

Local Mars time
15:48

Latitude (centered)
-38.531°

Longitude (East)
202.944°

Spacecraft altitude
252.6 km (157.0 miles)

Original image scale range
25.5 cm/pixel (with 1 x 1 binning) so objects ~77 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
8.0°

Phase angle
70.6°

Solar incidence angle
63°, with the Sun about 27° above the horizon

Solar longitude
185.0°, Northern Autumn

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North azimuth:  96°
Sub-solar azimuth:  25.3°
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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.