HiRISE | Rough-Textured Circular Feature (ESP_012425

NASA/JPL/University of Arizona

Rough-Textured Circular Feature
ESP_012425_1455 Science Theme: Other

800
1024
1152
1280
1440
1600
1920
2048
2560

PDF, 11 x 17 in

This circular feature is a collection of hills, with some connected by ridges.

The circularity suggests that perhaps there was once an impact crater here that was subsequently filled with material which was somehow more resistant to erosion than the landscape around it.

Over time, as erosion stripped away the ground, the fill material was left standing higher (although it has clearly been eroded as well).

Written by: Ross (8 April 2009)

Image Products: All image links are drag & drop for HiView, or click to download

JPEG
Grayscale: map projected non-map
IRB color: map projected non-map
RGB color: non-map projected

JP2 DOWNLOAD
Grayscale: map-projected (132.1 MB)
IRB color: map-projected (64.7 MB)

JP2 EXTRAS
Grayscale: map-projected (51.8 MB),
non-map (83.4 MB)

IRB color: map projected (15.8 MB)
non-map (85.9 MB)

RGB color: non map-projected (77.2 MB)

Additional Image Information
Grayscale label Color label
Merged IRB label Merged RGB label
EDR products

About color products (PDF)
HiView main page
HiRISE Online Image Viewer

Observation Toolbox

Acquisition date:	21 March 2009	Local Mars time:	3:43 PM
Latitude (centered):	-34.4 degrees	Longitude (East):	341.4 degrees
Range to target site:	254.8 km (159.2 miles)	Original image scale range:	51.0 cm/pixel (with 2 x 2 binning) so objects ~153 cm across are resolved
Map projected scale:	50 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	5.4 degrees	Phase angle:	46.0 degrees
Solar incidence angle:	51 degrees, with the Sun about 39 degrees above the horizon	Solar longitude:	231.6 degrees, Northern Autumn
For non-map projected products:
North azimuth:	97 degrees	Sub-solar azimuth:	7.9 degrees
For map-projected products
North azimuth:	270 degrees	Sub solar azimuth:	181.7 degrees

Usage Policy
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: Image: NASA/JPL/University of Arizona

Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.