Active Dunes in Wirtz Crater
NASA/JPL/University of Arizona
Active Dunes in Wirtz Crater
ESP_021893_1315  Science Theme: Aeolian Processes
twitter  •  tumblr

WALLPAPER
800
1024
1152
1280
1440
1600
1920
2048
2560
2736
2880
4500
4K
8K
10K

HIFLYER
PDF (11 x 17)

HISLIDES
PowerPoint
Keynote
PDF

These gorgeous dunes are likely active, with ripples on their upwind slopes and dark streaks on their downwind slopes forming and changing due to wind-driven sand motion.

This motion will also keep the dune brink (the edge between the two slopes) and bottom edges sharply defined. The dark lines and squiggles on the dune slope are formed by passing dust devils.

Written by: Serina Diniega  (26 November 2018)

This is a stereo pair with ESP_021603_1315.
 
Acquisition date
29 March 2011

Local Mars time:
15:04

Latitude (centered)
-48.243°

Longitude (East)
334.676°

Spacecraft altitude
254.7 km (159.2 miles)

Original image scale range
25.5 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
0.8°

Phase angle:
42.3°

Solar incidence angle
43°, with the Sun about 47° above the horizon

Solar longitude
263.7°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  21.2°
JPEG
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

JP2
Black and white
map-projected   (689MB)

IRB color
map-projected   (293MB)

JP2 EXTRAS
Black and white
map-projected  (286MB)
non-map           (425MB)

IRB color
map projected  (98MB)
non-map           (314MB)

Merged IRB
map projected  (144MB)

Merged RGB
map-projected  (147MB)

RGB color
non map           (315MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

DIGITAL TERRAIN MODEL (DTM)
DTM details page

ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
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

USAGE POLICY
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

POSTSCRIPT
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.