A First Look at a Gullied Slope
A First Look at a Gullied Slope
ESP_062714_2350  Science Theme: Mass Wasting Processes
HiRISE has been operating since 2006, and lately many of our observations of gullies are repeat images designed to study changes. However, we are also collecting data over gullies never before seen at this resolution, to study their morphology and allow us to look for changes in the future.

This is the first HiRISE look at a cluster of gullies that appear modified or degraded—the gully fans have ripples and ridges that have formed since the last major gully activity, suggesting that they don’t change very often, but we won’t know for sure unless we look!

Written by: HiRISE Science Team  (13 January 2020)
Acquisition date
13 December 2019

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
306.4 km (190.4 miles)

Original image scale range
30.8 cm/pixel (with 1 x 1 binning) so objects ~92 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
48°, with the Sun about 42° above the horizon

Solar longitude
119.9°, Northern Summer

For non-map projected images
North azimuth:  98°
Sub-solar azimuth:  342.1°
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   (436MB)

IRB color
map-projected   (279MB)

Black and white
map-projected  (195MB)
non-map           (192MB)

IRB color
map projected  (59MB)
non-map           (172MB)

Merged IRB
map projected  (131MB)

Merged RGB
map-projected  (126MB)

RGB color
non map           (166MB)
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.