Dynamic Activity in a Crater North of Antoniadi Crater
NASA/JPL/UArizona
Dynamic Activity in a Crater North of Antoniadi Crater
ESP_023261_2065  Science Theme: Aeolian Processes
There are many overlapping and competing geologic processes acting on the surface of Mars today. One area where this is most clearly illustrated is a small crater north of Antoniadi Crater. A digital terrain model was constructed of this site, which allowed all images to be corrected in a way to more easily identify and track changes (e.g., sand dunes, wind streaks).

In this image, we see a number of deposits that collectively form a large star-shaped megadune, just over 500-meters tall. Brighter surfaces of red Martian dust are vacuumed up by dust devils, leaving behind darker tracks that change dramatically over time. Over the Martian year, the surface changes in brightness as dust falls from the atmosphere. The dust is removed during windier portions of the year by sand ripples and dust devils. (Note the greatest change occurs at the end of the animations in Mars year 34 (MY34) and the period following the planet-encircling dust storm that occurred in mid-2018.)

In this animation (bottom of the sequence) we can view four of the smaller duneforms and their steepest slopes facing to the south. These “slip faces” are broadly perpendicular to the primary winds, indicating the dunes are slowly migrating south to south-southeast.

At the finest scale, a third animation reveals a single slip face where dark streaks are traces of meter-scale sand avalanches that indicate that the landform is currently active and moving. These types of sand streaks which seemingly form, fade, and then reappear have been described as recurring slope lineae (RSL) and have been observed elsewhere, including steep rocky cliffs without sand dunes. HiRISE is continuing to monitor dynamic locations like this to better understand how landscape evolution on Mars differs from that of Earth.

Written by: Matthew Chojnacki  (16 February 2020)

This is a stereo pair with ESP_023327_2065.
 
Acquisition date
14 July 2011

Local Mars time
14:02

Latitude (centered)
26.124°

Longitude (East)
57.038°

Spacecraft altitude
287.2 km (178.5 miles)

Original image scale range
28.8 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
Equirectangular

Emission angle
2.1°

Phase angle
48.0°

Solar incidence angle
49°, with the Sun about 41° above the horizon

Solar longitude
327.6°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  316.5°
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POSTSCRIPT
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.