Ice Block Avalanche
NASA/JPL/University of Arizona
Ice Block Avalanche
ESP_054663_2650  Science Theme: Polar Geology
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HiRISE has been re-imaging regions first photographed in 2006 through 2007, six Mars years ago. This long baseline allows us to see large, rare changes as well as many smaller changes.

One of the most actively changing areas on Mars are the steep edges of the North Polar layered deposits. This image shows many new ice blocks compared to an earlier image in December 2006. An animation shows one example, where a section of ice cliff collapsed. The older image (acquired in bin-2 mode) is not as sharp as the newer one.

Written by: Alfred McEwen (audio: Tre Gibbs)  (25 June 2018)
 
Acquisition date
25 March 2018

Local Mars time
13:07

Latitude (centered)
85.141°

Longitude (East)
236.948°

Spacecraft altitude
318.5 km (198.0 miles)

Original image scale range
31.9 cm/pixel (with 1 x 1 binning) so objects ~96 cm across are resolved

Map projected scale
25 cm/pixel

Map projection
Polarstereographic

Emission angle
0.1°

Phase angle
72.8°

Solar incidence angle
73°, with the Sun about 17° above the horizon

Solar longitude
149.0°, Northern Summer

For non-map projected images
North azimuth:  125°
Sub-solar azimuth:  320.4°
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   (507MB)

IRB color
map-projected   (313MB)

JP2 EXTRAS
Black and white
map-projected  (232MB)
non-map           (189MB)

IRB color
map projected  (58MB)
non-map           (194MB)

Merged IRB
map projected  (132MB)

Merged RGB
map-projected  (122MB)

RGB color
non map           (170MB)
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
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.