Richardson Crater Dunes, Partially Defrosted
Richardson Crater Dunes, Partially Defrosted
PSP_004230_1080  Science Theme: Seasonal Processes
Covered by seasonal carbon dioxide frost, the dune field here in Richardson Crater has only partially defrosted, although the image was acquired late in Mars' southern spring.

Large patches of carbon dioxide frost are observed, linked in some places by channels possibly carved into the ground by the erosion of carbon dioxide gas, as blocks dry ice slide down slope and sublimate (evaporate directly from solid to gas). Numerous dust devil tracks have left their mark.

Written by: Candy Hansen  (25 July 2007)
Acquisition date
22 June 2007

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
247.8 km (154.0 miles)

Original image scale range
25.0 cm/pixel (with 1 x 1 binning) so objects ~75 cm across are resolved

Map projected scale
25 cm/pixel

Map projection

Emission angle

Phase angle

Solar incidence angle
56°, with the Sun about 34° above the horizon

Solar longitude
262.2°, Northern Autumn

For non-map projected images
North azimuth:  101°
Sub-solar azimuth:  37.2°
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   (616MB)

IRB color
map-projected   (265MB)

Black and white
map-projected  (230MB)
non-map           (376MB)

IRB color
map projected  (81MB)
non-map           (297MB)

Merged IRB
map projected  (145MB)

Merged RGB
map-projected  (142MB)

RGB color
non map           (303MB)
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.