Strange Cones and Flows
NASA/JPL/University of Arizona
Strange Cones and Flows
ESP_037222_1820  Science Theme: Aeolian Processes
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The north end of this long image shows a lava surface in southern Elysium Planitia. Small cones are common on the extensive young flood lavas in this region.

Here, the cones are larger than usual, perhaps approaching cinder cone sizes. What's really odd here is that the cones are associated with lighter areas with polygonal patterns. Such polygons are commonly visible on the denser portions of lava flows, while the rougher areas have more broken-up low-density crust.

But the shapes of these regions are unusual, and the association with cones suggest that the cones were source vents for local lava flows. Other interpretations are also possible.

Written by: Alfred McEwen (audio: Tre Gibbs)   (13 August 2014)

This is a stereo pair with ESP_042141_1820.

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Acquisition date
05 July 2014

Local Mars time:
15:34

Latitude (centered)
1.808°

Longitude (East)
147.335°

Range to target site
288.0 km (180.0 miles)

Original image scale range
57.6 cm/pixel (with 2 x 2 binning) so objects ~173 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
19.8°

Phase angle:
73.0°

Solar incidence angle
54°, with the Sun about 36° above the horizon

Solar longitude
156.7°, Northern Summer

North azimuth:
96°

Sub-solar azimuth:
17.7°
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Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.