Frosted Impact Crater in Late Northern Winter
NASA/JPL/University of Arizona

Frosted Impact Crater in Late Northern Winter
ESP_032722_2405  Science Theme: Mass Wasting Processes
Spanish   Italian   Icelandic   Turkish   


720p (MP4)  
Listen to the text  


800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  2880  


PDF, 11 x 17 in  


This image was planned to search for gully activity in the Northern Hemisphere. Changing gullies have so far been documented only in the Southern Hemisphere, where a greater thickness of carbon dioxide frost forms in the winter.

The gullies are active when this frost is present, especially in the late winter and spring as it sublimates. The well-preserved crater here has a bright gully deposit (visible in prior images acquired in late northern summer), which suggests recent activity. An animated GIF blinking between these two images (at reduced resolution) shows how it changes in appearance with the seasons.

Written by: Alfred McEwen (audio by Tre Gibbs)   (21 August 2013)

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
Grayscale: map projected  non-map

IRB color: map projected  non-map

Merged IRB: map projected

Merged RGB: map projected

RGB color: non-map projected

Grayscale: map-projected (472.2 MB)

IRB color: map-projected (253.9 MB)

Grayscale: map-projected  (177.7 MB),
non-map  (225.9 MB)

IRB color: map projected  (53.7 MB)
non-map  (174.1 MB)

Merged IRB: map projected  (124.3 MB)

Merged RGB: map-projected  (115.5 MB)

RGB color: non map-projected  (165.9 MB)

Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:20 July 2013 Local Mars time: 1:55 PM
Latitude (centered):60.208° Longitude (East):236.276°
Range to target site:308.4 km (192.8 miles)Original image scale range:30.9 cm/pixel (with 1 x 1 binning) so objects ~93 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:2.6° Phase angle:68.4°
Solar incidence angle:67°, with the Sun about 23° above the horizon Solar longitude:354.3°, Northern Winter
For non-map projected products:
North azimuth:98° Sub-solar azimuth:309.1°
For map-projected products
North azimuth:270°Sub solar azimuth:121.8°

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
For information about NASA and agency programs on the Web, visit: 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.