Spiders on Mounds
NASA/JPL/University of Arizona
Spiders on Mounds
ESP_046562_1005  Science Theme: Seasonal Processes

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This terrain looks like lumpy sediment on top of patterned ground. The lumpy sediment is likely just loosely consolidated because it is covered with spidery channels.

This landform is uniquely Martian, formed in the spring as seasonal dry ice turns directly into gas that erodes channels in the surface.

This target was identified by citizen scientists at Planetfour: Terrains.

Written by: Candy Hansen (audio: Tre Gibbs)  (21 December 2016)

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Acquisition date
02 July 2016

Local Mars time:
16:27

Latitude (centered)
-79.341°

Longitude (East)
74.342°

Range to target site
247.6 km (154.7 miles)

Original image scale range
49.5 cm/pixel (with 2 x 2 binning) so objects ~149 cm across are resolved

Map projected scale
50 cm/pixel

Map projection
Polarstereographic

Emission angle:
2.2°

Phase angle:
84.7°

Solar incidence angle
86°, with the Sun about 4° above the horizon

Solar longitude
178.8°, Northern Summer

North azimuth:
106°

Sub-solar azimuth:
38.8°
JPEG
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

JP2
Black and white
map-projected   (320MB)

IRB color
map-projected   (191MB)

JP2 EXTRAS
Black and white
map-projected  (226MB)
non-map           (198MB)

IRB color
map projected  (137MB)
non-map           (195MB)

Merged IRB
map projected  (319MB)

Merged RGB
map-projected  (319MB)

RGB color
non map           (185MB)
ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

USAGE POLICY
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



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.