The Beautiful Arc of a Dune
The Beautiful Arc of a Dune
ESP_019992_1340  Science Theme: Aeolian Processes
In the full observation, we can see several dunes within a crater and a gorgeous dune that arcs to the center of the image.

One question that scientists want to know: do dunes move? That may seem obvious to us as we see dunes ripple with wind here on Earth, but we can”t always assume the same process works on Mars. Indeed, this observation was taken to study possible dune changes since one taken two Mars years ago.

Written by: HiRISE Science Team  (29 November 2010)

This is a stereo pair with ESP_020269_1340.
Acquisition date
01 November 2010

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
252.0 km (156.6 miles)

Original image scale range
25.6 cm/pixel (with 1 x 1 binning) so objects ~77 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
70°, with the Sun about 20° above the horizon

Solar longitude
173.6°, Northern Summer

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  32.9°
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   (1159MB)

IRB color
map-projected   (485MB)

Black and white
map-projected  (436MB)
non-map           (753MB)

IRB color
map projected  (168MB)
non-map           (598MB)

Merged IRB
map projected  (281MB)

Merged RGB
map-projected  (267MB)

RGB color
non map           (617MB)
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’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.