Gullies in Ius Chasma
Gullies in Ius Chasma
ESP_080617_1715  Science Theme: Mass Wasting Processes
Pristine gullies are common on steep slopes in the middle latitudes of Mars, where they are shaped by the action of carbon dioxide frost. There are also pristine gullies in equatorial Valles Marineris where little carbon dioxide frost is deposited.

These equatorial gullies are often associated with recurring slope lineae (RSL); dark thin flows that form at the warmest times on steep slopes. We do not know if the RSL help carve the gullies or if they just follow gullies that formed by some other process.

Written by: Alfred McEwen  (17 November 2023)

Acquisition date
07 October 2023

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
263.2 km (163.6 miles)

Original image scale range
52.9 cm/pixel (with 2 x 2 binning) so objects ~159 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
61°, with the Sun about 29° above the horizon

Solar longitude
129.8°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  33.8°
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
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RGB color
non-map projected

Black and white
map-projected   (154MB)

IRB color
map-projected   (54MB)

Black and white
map-projected  (85MB)
non-map           (141MB)

IRB color
map projected  (22MB)
non-map           (54MB)

Merged IRB
map projected  (148MB)

Merged RGB
map-projected  (140MB)

RGB color
non map           (50MB)
B&W label
Color label
Merged IRB label
Merged RGB label
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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

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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.