A Rare Bull
NASA/JPL/UArizona
A Rare Bull's-Eye Crater
ESP_019727_1930  Science Theme: Impact Processes
HiRISE has seen concentric forms in craters before, like ESP_018522_2270,, or PSP_003398_1910. However, the one present in this image seems like a very good candidate for a serendipitous second impact right in the middle of a pre-existing crater.

Unlike the forms in ESP_018522_2270, it appears here that the small crater in the center of the image has thrown out ejecta, including some boulders. Additionally, the one kilometer (a little over half a mile) central crater looks fresher (and therefore more recent) than the larger (7 kilometer, or not quite 4.5 mile) crater, which is heavily eroded. The smaller feature also appears to have a raised rim, as would be expected for an impact crater, but not for a central pit produced by a single impact into a layered target. Although newer craters are frequently found inside older craters, this sort of bull's-eye second impact is rare.

The subimage shows the rim of the central crater at full resolution. In this image, you can see boulders on the outside of the rim that are likely ejecta. Also visible are boulder tracks on the crater wall, formed as blocks on the rim tumbled down the slope.



Written by: Nicole Baugh  (29 November 2010)
 
Acquisition date
11 October 2010

Local Mars time
15:35

Latitude (centered)
12.654°

Longitude (East)
61.838°

Spacecraft altitude
273.5 km (170.0 miles)

Original image scale range
27.4 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
2.5°

Phase angle
50.6°

Solar incidence angle
53°, with the Sun about 37° above the horizon

Solar longitude
162.4°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  5.0°
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   (639MB)

IRB color
map-projected   (296MB)

JP2 EXTRAS
Black and white
map-projected  (316MB)
non-map           (323MB)

IRB color
map projected  (108MB)
non-map           (274MB)

Merged IRB
map projected  (162MB)

Merged RGB
map-projected  (155MB)

RGB color
non map           (264MB)
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/UArizona

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.