Polar Troughs
NASA/JPL/University of Arizona
Polar Troughs
ESP_056193_0930  Science Theme: Polar Geology
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Some of the carbon dioxide on the South Pole does not completely sublimate each year and remains through the summer, and is called the residual cap.

This image show a sample of the cap, which has a regular pattern of troughs in this region.

Written by: Alfred McEwen  (28 September 2018)
Acquisition date
23 July 2018

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
243.8 km (151.5 miles)

Original image scale range
48.8 cm/pixel (with 2 x 2 binning) so objects ~146 cm across are resolved

Map projected scale
50 cm/pixel

Map projection

Emission angle

Phase angle

Solar incidence angle
77°, with the Sun about 13° above the horizon

Solar longitude
216.3°, Northern Autumn

For non-map projected images
North azimuth:  151°
Sub-solar azimuth:  37.5°
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   (622MB)

IRB color
map-projected   (350MB)

Black and white
map-projected  (365MB)
non-map           (400MB)

IRB color
map projected  (174MB)
non-map           (440MB)

Merged IRB
map projected  (645MB)

Merged RGB
map-projected  (561MB)

RGB color
non map           (383MB)
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.