Enigmatic Mound on the Crater Floor on Margaritifer Terra
Enigmatic Mound on the Crater Floor on Margaritifer Terra
ESP_023264_1680  Science Theme: Volcanic Processes
The origin of this mound on a crater floor was not clear from prior image coverage, so we targeted HiRISE to take a closer look. With study of the HiRISE image, the geologic history may or may not be clarified, but it is certainly a striking image.

The dark sand collected in low areas creates a high contrast with the lighter-toned bedrock, and there are caterpillar-like wind-blown dunes or ripples crawling over the surface. The subimage shows an enhanced-color view.

Written by: Alfred McEwen  (31 August 2011)
Acquisition date
14 July 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
265.1 km (164.8 miles)

Original image scale range
53.0 cm/pixel (with 2 x 2 binning) so objects ~159 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
32°, with the Sun about 58° above the horizon

Solar longitude
327.7°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  0.6°
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   (187MB)

IRB color
map-projected   (92MB)

Black and white
map-projected  (74MB)
non-map           (116MB)

IRB color
map projected  (25MB)
non-map           (103MB)

Merged IRB
map projected  (196MB)

Merged RGB
map-projected  (180MB)

RGB color
non map           (95MB)
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’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.