36 Gullies
36 Gullies
ESP_022682_1360  Science Theme: Glacial/Periglacial Processes
The 36 gullies referred to in the title of this observation were previously identified and fully described in a MOC image (M0303547). But HiRISE resolution can help to refine previous surveys.

Additionally, with the color swath, we can try to distinguish lithological (rock) units, and look for evaporite deposits (rocks formed when mineral-rich water evaporates) that might indicate past presence of water.

This caption is based on the original science rationale.

Written by: HiRISE Science Team  (6 July 2011)

This is a stereo pair with PSP_005646_1360.
Acquisition date
29 May 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
251.1 km (156.0 miles)

Original image scale range
51.0 cm/pixel (with 2 x 2 binning) so objects ~153 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
38°, with the Sun about 52° above the horizon

Solar longitude
301.6°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  31.1°
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   (284MB)

IRB color
map-projected   (144MB)

Black and white
map-projected  (145MB)
non-map           (161MB)

IRB color
map projected  (57MB)
non-map           (147MB)

Merged IRB
map projected  (271MB)

Merged RGB
map-projected  (247MB)

RGB color
non map           (130MB)
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/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.