Rough-Textured Circular Feature
Rough-Textured Circular Feature
ESP_012425_1455  Science Theme: Other
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 Beyer  (8 April 2009)
Acquisition date
21 March 2009

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
253.8 km (157.7 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

Emission angle

Phase angle

Solar incidence angle
51°, with the Sun about 39° above the horizon

Solar longitude
231.6°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  8.3°
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

Black and white
map-projected   (132MB)

IRB color
map-projected   (65MB)

Black and white
map-projected  (52MB)
non-map           (83MB)

IRB color
map projected  (16MB)
non-map           (84MB)

Merged IRB
map projected  (158MB)

Merged RGB
map-projected  (143MB)

RGB color
non map           (77MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

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

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.