Gullies and... Gullies? in Terra Sirenum
NASA/JPL/University of Arizona

Gullies and... Gullies? in Terra Sirenum
PSP_001697_1390  Science Theme: Glacial/Periglacial Processes
Spanish Italian 



WALLPAPER

800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  

HIFLYER

PDF, 11 x 17 in  
This observation shows part of an unnamed crater, itself located inside the much larger Newton Crater, in Terra Sirenum. This unnamed crater is approximately 7 kilometers in diameter (over 4 miles) and some 700 meters (760 yards) deep.

Numerous gully systems are visible on the east- and south-facing walls of the crater; their characteristics are astonishingly diverse.

The subimage covers an area of nearly 610 x 740 meters (670 x 800 yards). Downhill is toward the bottom of the image, north is up; illumination is from the northwest. This subimage depicts several gullies or troughs carved in the southwest-facing wall of the crater.

These troughs are extremely rectilinear, lack tributaries, and do not seem to have terminal fan deposits: they terminate rather abruptly, some of them in a spatula-like shape. Their characteristics contrast sharply with those of gully systems elsewhere in this same crater, which are sinuous, have numerous tributaries, and show distinct fan deposits.

HiRISE is unveiling the large diversity exhibited by Martian gully systems, thanks to its high-resolution, stereo, and color capabilities. The diverse types of gullies observed may have been produced by different mechanisms. Current leading hypotheses explaining the origin of gullies include erosion from seepage or eruption of water from a subsurface aquifer, melting of ground ice, or surface snow; and dry landslides.

Written by: Sara Martinez-Alonso   (3 March 2010)

  Click to share this post on Twitter Click to share this post on Facebook Click to share this post on Google+ Click to share this post on Tumblr


 Image Products: All image links are drag & drop for HiView, or click to download
JPEG
Grayscale: map projected  non-map
IRB color: map projected  non-map
Merged IRB: map projected
Merged RGB: map projected
RGB color: non-map projected

JP2 DOWNLOAD
Grayscale: map-projected (155.7 MB)
IRB color: map-projected (70.6 MB)

JP2 EXTRAS
Grayscale: map-projected  (58.8 MB),
non-map  (101.5 MB)
IRB color: map projected  (18.5 MB)
non-map  (72.1 MB)
Merged IRB: map projected  (132.5 MB)
Merged RGB: map-projected  (135.1 MB)
RGB color: non map-projected  (69.2 MB)

ADDITIONAL IMAGE INFORMATION
Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:06 December 2006 Local Mars time: 3:40 PM
Latitude (centered):-40.807° Longitude (East):200.209°
Range to target site:256.4 km (160.3 miles)Original image scale range:51.3 cm/pixel (with 2 x 2 binning) so objects ~154 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:9.0° Phase angle:81.6°
Solar incidence angle:74°, with the Sun about 16° above the horizon Solar longitude:146.3°, Northern Summer
For non-map projected products:
North azimuth:96° Sub-solar azimuth:40.4°
For map-projected products
North azimuth:270°Sub solar azimuth:213.9°

Context map

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: Image: 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.