Splotches and Channels Near Sisyphi Montes
Splotches and Channels Near Sisyphi Montes
PSP_005424_1075  Science Theme: Glacial/Periglacial Processes
This image shows high latitude terrain near the Sisyphi Montes. Patterned ground is everywhere throughout the scene, and there are several muted craters that have relaxed over time due to the presence of ground ice.

Dark splotches are also common. Using full HiRISE resolution, the dark splotches exist around boulders. It is possible that the boulders are ejecta from the freshest crater in the scene, the small crater near the top of the image. They could also be from another impact crater not in this image or be a result of a periglacial stone sorting process that leaves the large boulders isolated.

Written by: Kelly Kolb  (23 January 2008)
Acquisition date
23 September 2007

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
251.5 km (156.3 miles)

Original image scale range
25.2 cm/pixel (with 1 x 1 binning) so objects ~75 cm across are resolved

Map projected scale
25 cm/pixel

Map projection

Emission angle

Phase angle

Solar incidence angle
61°, with the Sun about 29° above the horizon

Solar longitude
318.6°, Northern Winter

For non-map projected images
North azimuth:  100°
Sub-solar azimuth:  52.0°
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

Black and white
map-projected   (756MB)

IRB color
map-projected   (348MB)

Black and white
map-projected  (442MB)
non-map           (502MB)

IRB color
map projected  (220MB)
non-map           (361MB)

Merged IRB
map projected  (223MB)

Merged RGB
map-projected  (216MB)

RGB color
non map           (349MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

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

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’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.