A Crater on a Crater Wall
NASA/JPL/University of Arizona
A Crater on a Crater Wall
ESP_050259_1380  Science Theme: Impact Processes


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It’s not that common to see craters on steep hills, partly because rocks falling downhill can quickly erase such craters. Here, however, a small impact occurred on the sloping wall of a larger crater and is well-preserved.

Dark, blocky ejecta from the smaller crater has flowed downhill (to the west) toward the floor of the larger crater. Understanding the emplacement of such ejecta on steep hills is an area of ongoing research.

Written by: Kirby Runyon  (13 June 2017)
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Acquisition date
16 April 2017

Local Mars time:
14:17

Latitude (centered)
-41.780°

Longitude (East)
281.680°

Range to target site
247.9 km (155.0 miles)

Original image scale range
from 24.8 cm/pixel (with 1 x 1 binning) to 49.6 cm/pixel (with 2 x 2 binning)

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
3.6°

Phase angle:
46.5°

Solar incidence angle
49°, with the Sun about 41° above the horizon

Solar longitude
350.5°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  47.4°
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All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona

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.