Bull
NASA/JPL/University of Arizona
Bull's-Eye Impact Crater
ESP_018522_2270  Science Theme: Impact Processes
Greek  Italian  Spanish 

WALLPAPER

800  1024
1152  1280
1440  1600
1920  2048
2560

HIFLYER

PDF, 11 x 17 in
What caused the central pit within this impact crater: unusual subsurface layering or a lucky second impact?

Impacts into layers of alternately strong and weak material for example, ice rich versus non-ice-rich produce terracing such as that seen between the inner pit and the outer rim. Scientists have used terraced craters to estimate the thickness of lava flows on the Moon and elsewhere. Uneven sublimation and periglacial erosion of exposed ice-rich material in the interior of the crater may explain why the small central pit is slightly offset from center relative to the terrace and rim of the larger crater.

The pit in the center of the main feature could also be from a later impact crater striking inside and slightly off-center from the original. It has a raised rim, which is characteristic of impact craters and is difficult to explain with a layered target. While no ejecta from this later impact can be seen, the ejecta could have been removed by extensive periglacial modification. Additionally, the floor fill around the inner crater resembles impact ejects elsewhere at this latitude, and some of the "landslides" to the East could be flow-back of ejecta off the walls of the larger crater.

Written by: Sarah Milkovich   (28 July 2010)

This is a stereo pair with ESP_019010_2270.

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
 
Acquisition date
09 July 2010

Local Mars time:
15:11

Latitude (centered)
46.563°

Longitude (East)
194.854°

Range to target site
304.0 km (190.0 miles)

Original image scale range
30.4 cm/pixel (with 1 x 1 binning) so objects ~91 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
2.5°

Phase angle:
47.8°

Solar incidence angle
45°, with the Sun about 45° above the horizon

Solar longitude
115.9°, Northern Summer

North azimuth:
97°

Sub-solar azimuth:
350.1°
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   (753MB)

IRB color
map-projected   (337MB)

JP2 EXTRAS
Black and white
map-projected  (343MB)
non-map           (348MB)

IRB color
map projected  (111MB)
non-map           (239MB)

Merged IRB
map projected  (236MB)

Merged RGB
map-projected  (227MB)

RGB color
non map           (228MB)
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
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.