Valley West of Ganges Chasma
Valley West of Ganges Chasma
PSP_009011_1705  Science Theme: Geologic Contacts/Stratigraphy
This image shows an apparent valley north of a 37-kilometer long pit called Ophir Cavus.This valley is just west of another 155-km long valley system called Allegheny Vallis that also emanates from the pit.

The association of valleys with the pit suggests that water was released when the pit formed, perhaps when volcanic eruptions melted ice in the surface or subsurface. The HiRISE image reveals light-toned units along portions of the plains and these could be minerals deposited by the flowing water or alteration of the plains by the water that once flowed here.

Written by: Cathy  (6 August 2008)
Acquisition date
28 June 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
258.6 km (160.7 miles)

Original image scale range
25.9 cm/pixel (with 1 x 1 binning) so objects ~78 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

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

Solar longitude
91.5°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  41.6°
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   (1201MB)

IRB color
map-projected   (561MB)

Black and white
map-projected  (553MB)
non-map           (759MB)

IRB color
map projected  (238MB)
non-map           (566MB)

Merged IRB
map projected  (258MB)

Merged RGB
map-projected  (258MB)

RGB color
non map           (544MB)
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.