Streamlined Islands in Hrad Vallis
Streamlined Islands in Hrad Vallis
PSP_007738_2145  Science Theme: Fluvial Processes
This image shows a portion of Hrad Vallis, an approximately 400 meter (1300 feet) deep and 800 kilometer (500 mile) long depression located in the Elysium Planitia.

Hrad Vallis is one of several channel systems that are found just west of the Elysium volcanoes. The scoured floor of Hrad Vallis shows the effects of erosion, presumably by water.

Flowing water in the past has carved and sculpted rocky masses into streamlined shapes or islands. The streamlined islands often have sharp edges and are narrower at the downstream end and wider at the upstream end. The streamlined islands visible here are located in an area where the flow condensed from the fractured terrain of the Hrad Valles headwaters (to the southeast) to a more regular channel (to the northwest).

Written by: Maria Banks  (9 April 2008)

This is a stereo pair with PSP_008028_2145.
Acquisition date
21 March 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
297.4 km (184.8 miles)

Original image scale range
29.9 cm/pixel (with 1 x 1 binning) so objects ~90 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
42°, with the Sun about 48° above the horizon

Solar longitude
48.0°, Northern Spring

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  353.8°
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Black & white is 5 km across; enhanced color about 1 km
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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.