Dunes Frozen in Time
Dunes Frozen in Time
ESP_062562_1670  Science Theme: Aeolian Processes
Sand dunes are found in many places on Mars. At most of these places the dunes are slowly moving, blown by the wind, just like on Earth. However, in this location in south Melas Chasma they appear to have turned to stone.

The large dunes are slowly being eroded and disappearing, replaced by smaller structures of scalloped sand.

Written by: Candy Hansen  (13 January 2020)
Acquisition date
01 December 2019

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
262.3 km (163.0 miles)

Original image scale range
26.3 cm/pixel (with 1 x 1 binning) so objects ~79 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
61°, with the Sun about 29° above the horizon

Solar longitude
114.4°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  41.2°
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   (481MB)

IRB color
map-projected   (291MB)

Black and white
map-projected  (193MB)
non-map           (296MB)

IRB color
map projected  (65MB)
non-map           (241MB)

Merged IRB
map projected  (123MB)

Merged RGB
map-projected  (118MB)

RGB color
non map           (233MB)
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.