Ridged Crater Floor and Gullies
Ridged Crater Floor and Gullies
ESP_021489_1405  Science Theme: Fluvial Processes
This observation shows a small crater within the much larger Newton Crater, and is approximately 6 kilometers across.

There are gullies on the pole-facing slopes, as well as an impressive ridged floor. Is the ridged floor older than the gullies? Could the ridged unit be a moraine? This is a term denoting an accumulation of boulders, stones, or other debris.

Newton Crater, almost 300 kilometers in diameter, is located in the heavily cratered highlands of Terra Sirenum. It was named for Sir Isaac Newton.

This caption is based on the original science rationale for the observation.

Written by: HiRISE Science Team  (6 April 2011)

This is a stereo pair with ESP_022122_1400.
Acquisition date
25 February 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
253.8 km (157.7 miles)

Original image scale range
50.8 cm/pixel (with 2 x 2 binning) so objects ~152 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
46°, with the Sun about 44° above the horizon

Solar longitude
243.7°, Northern Autumn

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  12.4°
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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/JPL/University of Arizona

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.