Imaging in Deep Shadows
NASA/JPL/University of Arizona
Imaging in Deep Shadows
ESP_025680_1350  Science Theme: Impact Processes
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This image of an impact crater in Terra Cimmeria was acquired when the sun was just 11 degrees above the horizon, so a long shadow extends over most of the crater interior.

However, there is still diffuse illumination from the sky and HiRISE has the ability to acquire sufficient signal over faint targets to make useful images. The subimage shows an area entirely in shadow, but with pixel values "stretched" to show the detail.

The crater interior shows a pattern of ridges and mounds suggestive of icy flow, which is common at this latitude on Mars.

Written by: Alfred McEwen  (22 February 2012)
 
Acquisition date
18 January 2012

Local Mars time
15:08

Latitude (centered)
-44.814°

Longitude (East)
264.976°

Spacecraft altitude
247.7 km (154.0 miles)

Original image scale range
49.6 cm/pixel (with 2 x 2 binning) so objects ~149 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.3°

Phase angle
79.1°

Solar incidence angle
79°, with the Sun about 11° above the horizon

Solar longitude
58.6°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  52.0°
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   (215MB)

IRB color
map-projected   (130MB)

JP2 EXTRAS
Black and white
map-projected  (103MB)
non-map           (131MB)

IRB color
map projected  (45MB)
non-map           (109MB)

Merged IRB
map projected  (191MB)

Merged RGB
map-projected  (185MB)

RGB color
non map           (115MB)
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.