A Light Toned Deposit in Arsinoes Chaos
A Light Toned Deposit in Arsinoes Chaos
ESP_037545_1730  Science Theme: Geologic Contacts/Stratigraphy
The objective of this observation is to examine a light-toned deposit in a region of what is called “chaotic terrain” at the base of the Valles Marineris canyon system.

The deposit displays a rough surface, in contrast to the smoothness of the surrounding area. Some parts of the surface appear as if they were eroded by a fluid flowing north and south, or perhaps sculpted by the wind. This area is also visible in a Context Camera image (P04_002747_1736). This deposit may be related to interior layered deposits in the Valles Marineris where it’s been suggested to have formed in an ancient lake.

This caption is based on the original science rationale.

Written by: HiRISE Science Team (narration: Tre Gibbs)  (15 October 2014)
Acquisition date
31 July 2014

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
268.3 km (166.7 miles)

Original image scale range
53.7 cm/pixel (with 2 x 2 binning) so objects ~161 cm across are resolved

Map projected scale
50 cm/pixel and North is up

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Emission angle

Phase angle

Solar incidence angle
57°, with the Sun about 33° above the horizon

Solar longitude
170.2°, Northern Summer

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North azimuth:  97°
Sub-solar azimuth:  15.7°
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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.