Fresh Double-Layered Ejecta Crater
NASA/JPL/UArizona
Fresh Double-Layered Ejecta Crater
PSP_009160_2350  Science Theme: Impact Processes
This scene features a high latitude, northern hemisphere crater with double-layered ejecta. The sharp rim and lack of small superposed craters indicates that this crater is relatively young.

The semi-circular feature that parallels the crater rim is a terrace that probably formed as part of the crater wall collapsed into the center. The circular mound in the center likely formed at the same time as the crater itself. Large craters on Mars can have central peaks; this crater looks like it was on the cusp of having one. The linear features surrounding the crater on its ejecta are striations that formed during the impact as material and wind exploded out from the center.

At the bottom of the scene is a very distinct ejecta flow lobe (lobate ejecta). Lobate ejecta is thought to form when an impact occurs on a surface with lots of volatiles—ices that quickly turn to gas when they are heated. The gases help make the ejecta flow like a fluid.



Written by: Kelly Kolb  (20 August 2008)

This is a stereo pair with PSP_007947_2350.
 
Acquisition date
10 July 2008

Local Mars time
15:21

Latitude (centered)
54.476°

Longitude (East)
190.607°

Spacecraft altitude
310.9 km (193.2 miles)

Original image scale range
65.8 cm/pixel (with 2 x 2 binning) so objects ~197 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
19.8°

Phase angle
28.2°

Solar incidence angle
47°, with the Sun about 43° above the horizon

Solar longitude
96.7°, Northern Summer

For non-map projected images
North azimuth:  93°
Sub-solar azimuth:  344.7°
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   (840MB)

IRB color
map-projected   (416MB)

JP2 EXTRAS
Black and white
map-projected  (411MB)
non-map           (290MB)

IRB color
map projected  (151MB)
non-map           (287MB)

Merged IRB
map projected  (797MB)

Merged RGB
map-projected  (725MB)

RGB color
non map           (259MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

DIGITAL TERRAIN MODEL (DTM)
DTM details page

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.