Gullies Old and New near the Argyre Region
Gullies Old and New near the Argyre Region
ESP_038931_1355  Science Theme: Fluvial Processes
As gullies form on slopes, sediment can become deposited to form lobe-shaped fans. Gullies can form with flowing water, but don’t have to: sometimes they can be formed by the dry flow of sand and dust grains. This HiRISE image shows several seemingly active gullies and their associated fans.

These particular gullies have many fine channels that are resolved nicely with a high resolution image.

Written by: HiRISE Science Team (narration: Tre Gibbs)  (28 January 2015)
Acquisition date
16 November 2014

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
249.7 km (155.2 miles)

Original image scale range
50.0 cm/pixel (with 2 x 2 binning) so objects ~150 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
51°, with the Sun about 39° above the horizon

Solar longitude
234.3°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  14.3°
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   (205MB)

IRB color
map-projected   (105MB)

Black and white
map-projected  (81MB)
non-map           (139MB)

IRB color
map projected  (33MB)
non-map           (141MB)

Merged IRB
map projected  (235MB)

Merged RGB
map-projected  (217MB)

RGB color
non map           (130MB)
HiClip mini HD

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/JPL/University of Arizona

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.