Many Fantastically Colorful Gullies
Many Fantastically Colorful Gullies
ESP_024927_1445  Science Theme: Impact Processes
This image covers a “fresh-looking” impact crater with a diameter of about 2 kilometers (1.2 miles).

There are gullies all around the steep inner slopes of this crater (you can even see them in the shadow by enhancing the brightness of this region), at 35 degrees south latitude. Many craters at this latitude in the Southern Hemisphere only have gullies on the south-facing slopes, which are shadowed in the wintertime. But this is an especially pristine crater so the slopes may be particularly steep and unstable.

The enhanced color cutout shows that gullies and their deposits have many different colors. This is due to diverse rock types exposed by the crater and the fact that the gullies have been recently active, so colors have not been homogenized by overlying regolith (soil) or windblown deposits. HiRISE will monitor this site in the future to see if the gullies are currently active.

How long ago did this crater form? It appears nearly pristine, preserving meter-scale morphologies in the ejecta, and there are almost no superimposed (younger) impact craters, so it is probably less than a million years old. That means the crater formed in the most recent 0.02 percent of Mars’ existence. The ejecta includes a “herringbone” texture with V-shaped features pointing to the source crater.

Written by: Alfred McEwen  (29 November 2011)

This is a stereo pair with ESP_024637_1445.
Acquisition date
20 November 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
251.0 km (156.0 miles)

Original image scale range
25.2 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

Emission angle

Phase angle

Solar incidence angle
63°, with the Sun about 27° above the horizon

Solar longitude
32.5°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  48.3°
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   (461MB)

IRB color
map-projected   (298MB)

Black and white
map-projected  (208MB)
non-map           (281MB)

IRB color
map projected  (74MB)
non-map           (257MB)

Merged IRB
map projected  (128MB)

Merged RGB
map-projected  (123MB)

RGB color
non map           (257MB)
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.