Ejecta Blanket of an Impact Crater
Ejecta Blanket of an Impact Crater
PSP_007822_1415  Science Theme: Impact Processes
The ejecta blanket of a large (20 kilometer diameter) impact crater is shown here in vivid detail. The ejecta formed strong linear patterns in the topography that extend radially outward from the crater. This ejecta is rocky material that was ejected from the crater as a result of the high-velocity impact of an object about 100-200 meters in diameter, which probably escaped from the asteroid belt.

Since the impact event, this ejecta has been subject to millions of years of wind erosion that may have etched the surface and accentuated the radial pattern. There are also small-scale landforms such as fractured mounds that may have formed due to the presence of subsurface ice.

Written by: Alfred McEwen  (30 April 2008)
Acquisition date
27 March 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
255.5 km (158.8 miles)

Original image scale range
51.1 cm/pixel (with 2 x 2 binning) so objects ~153 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

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

Solar longitude
50.9°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  49.3°
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

Black and white
map-projected   (412MB)

IRB color
map-projected   (201MB)

Black and white
map-projected  (218MB)
non-map           (246MB)

IRB color
map projected  (77MB)
non-map           (185MB)

Merged IRB
map projected  (361MB)

Merged RGB
map-projected  (350MB)

RGB color
non map           (183MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

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

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NASA/JPL/University of Arizona

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.