What Gullies Can Say
What Gullies Can Say
ESP_027989_1425  Science Theme: Mass Wasting Processes
Right past the sharp, but warped rim of this ancient impact crater are deposits of winter frost, which show up as blue in enhanced color.

There are two possible science goals that we can study here: what does the terrain look like during the Martian summer, because HiRISE resolution can track changes over time. And second, could the gullies in this crater be a reasonable place to look for recurring slope lineae (or RSL) to occur? The slopes of certain craters have been home these phenomena in other regions as well.

Note: the images here are not map-projected, so approximate north is down.

Written by: HiRISE Science Team (narration: Tre Gibbs)  (22 May 2014)
Acquisition date
16 July 2012

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
250.8 km (155.9 miles)

Original image scale range
25.3 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
73°, with the Sun about 17° above the horizon

Solar longitude
140.2°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  41.3°
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   (442MB)

IRB color
map-projected   (258MB)

Black and white
map-projected  (215MB)
non-map           (242MB)

IRB color
map projected  (76MB)
non-map           (214MB)

Merged IRB
map projected  (97MB)

Merged RGB
map-projected  (92MB)

RGB color
non map           (212MB)
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.