Gullied Massif in the Nereidum Montes
Gullied Massif in the Nereidum Montes
ESP_032522_1345  Science Theme: Mass Wasting Processes
This observation shows a beautiful example of gullies in a massif in Nereidum Montes, located in Argyre Planitia, one of the largest impact basins on Mars.

The purpose of acquiring this full-resolution image of these gullies was to take a closer look at where they are originating from in the massif wall. If we can answer that, we might be able to learn what were the processes that actually formed these gullies. In this particular region, there might be indications of a glacial past.

Nereidum Montes extends approximately 1150 kilometers, and was named by the noted Greek astronomer Eugène Michel Antoniadi (1870-1944).

Written by: HIRISE Science Team (narration: Tre Gibbs)  (3 September 2013)
Acquisition date
04 July 2013

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
255.0 km (158.5 miles)

Original image scale range
25.5 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
50°, with the Sun about 40° above the horizon

Solar longitude
346.2°, Northern Winter

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  46.6°
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   (576MB)

IRB color
map-projected   (342MB)

Black and white
map-projected  (227MB)
non-map           (374MB)

IRB color
map projected  (77MB)
non-map           (295MB)

Merged IRB
map projected  (150MB)

Merged RGB
map-projected  (144MB)

RGB color
non map           (294MB)
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.