Crater Gullies and Fractures in Acidalia Planitia
NASA/JPL/University of Arizona
Crater Gullies and Fractures in Acidalia Planitia
ESP_054832_2185  Science Theme: Glacial/Periglacial Processes
twitter  •  tumblr

HICLIP
1080p (MP4)
Audio (MP3)

WALLPAPER
800
1024
1152
1280
1440
1600
1920
2048
2560
2736
2880
4500
4K
8K
10K

HIFLYER
PDF (11 x 17)

HISLIDES
PowerPoint
Keynote
PDF

This image shows the gullied western slopes of an unnamed crater (about 10 kilometers wide) in Acidalia Planitia. These slopes have gone through a complicated history of gully erosion of the bedrock layers in the upper section, followed by the formation of fractures along the lower slopes.

As the gullies continued to form, fractures cut across them and their debris fans in the lower part of the slopes. A prominent cliff has been eroded by more recent gully activity. The curved ridges and lobes on the crater floor, downslope of the debris fans, along with multiple fractures, suggest that the subsurface was ice-rich. This is an example of how geologists can utilize the concept of superposition to unravel the relative timing of geological events in the crater’s history.

Written by: Ginny Gulick (audio: Tre Gibbs)  (4 September 2018)

This is a stereo pair with ESP_055320_2185.
 
Acquisition date
08 April 2018

Local Mars time
15:17

Latitude (centered)
37.965°

Longitude (East)
338.732°

Spacecraft altitude
297.8 km (185.1 miles)

Original image scale range
29.8 cm/pixel (with 1 x 1 binning) so objects ~89 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.3°

Phase angle
52.3°

Solar incidence angle
52°, with the Sun about 38° above the horizon

Solar longitude
155.8°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  347.2°
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   (754MB)

IRB color
map-projected   (436MB)

JP2 EXTRAS
Black and white
map-projected  (351MB)
non-map           (355MB)

IRB color
map projected  (131MB)
non-map           (314MB)

Merged IRB
map projected  (193MB)

Merged RGB
map-projected  (185MB)

RGB color
non map           (311MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph 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.