Frosted Dunes
Frosted Dunes
ESP_045311_1205  Science Theme: Seasonal Processes
Sand dunes cover much of this terrain, which has large boulders lying on flat areas between the dunes.

It is now late winter here in the Southern hemisphere, and these dunes are just getting enough sunlight to start defrosting their seasonal cover of carbon dioxide. Spots form where pressurized carbon dioxide gas escapes to the surface.

This is part of a stereo pair, so be sure to look at the stereo anaglyph.

Written by: Alfred McEwen (audio: Tre Gibbs)  (18 May 2016)

This is a stereo pair with ESP_045245_1205.
Acquisition date
27 March 2016

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
249.0 km (154.8 miles)

Original image scale range
100.7 cm/pixel (with 4 x 4 binning) so objects ~302 cm across are resolved

Map projected scale
100 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
90°, with the Sun about 0° above the horizon

Solar longitude
128.4°, Northern Summer

For non-map projected images
North azimuth:  98°
Sub-solar azimuth:  49.1°
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   (84MB)

IRB color
map-projected   (56MB)

Black and white
map-projected  (42MB)
non-map           (53MB)

IRB color
map projected  (21MB)
non-map           (53MB)

Merged IRB
map projected  (87MB)

Merged RGB
map-projected  (77MB)

RGB color
non map           (48MB)
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

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.