Lobate Flow Features in the Northwest Hellas Rim
Lobate Flow Features in the Northwest Hellas Rim
ESP_024000_1425  Science Theme: Glacial/Periglacial Processes
This image, taken by HiRISE, shows a lobate tongue on the Northwest Hellas rim.

Lobate features such as these are located in the mid-latitudes (30-60 degrees), indicative of viscous flow, are reminiscent of terrestrial glaciers and have long-been interpreted as evidence for subsurface ice.

Recent ground penetrating radar observations by SHARAD of other lobate features in this latitude belt also support the notion that these features have cores with ice.

Written by: Eldar Noe  (19 October 2011)

This is a stereo pair with ESP_023710_1425.
Acquisition date
09 September 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
257.1 km (159.8 miles)

Original image scale range
28.7 cm/pixel (with 1 x 1 binning) so objects ~86 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
47°, with the Sun about 43° above the horizon

Solar longitude
358.0°, Northern Winter

For non-map projected images
North azimuth:  90°
Sub-solar azimuth:  48.1°
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Black & white is 5 km across; enhanced color about 1 km
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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.