Recurring Slope Lineae in Raga Crater
Recurring Slope Lineae in Raga Crater
ESP_040028_1315  Science Theme: Impact Processes
This image covers Raga Crater, the location of well-studied recurring slope lineae (RSL). RSL are dark flows that disappear and re-form every Mars year at certain locations.

A closeup image compares the dark flows at the same time in three consecutive Mars years. We can see that the pattern of lineae is nearly the same every year, but in the latest image they are slightly shorter.

Comparisons like these will help the HiRISE team learn how much the flows vary from year to year, as well as why they are different.

Written by: Colin Dundas (audio by Tre Gibbs)  (11 March 2015)
Acquisition date
09 February 2015

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
250.1 km (155.4 miles)

Original image scale range
25.2 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
41°, with the Sun about 49° above the horizon

Solar longitude
288.1°, Northern Winter

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  27.0°
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   (367MB)

IRB color
map-projected   (220MB)

Black and white
map-projected  (151MB)
non-map           (223MB)

IRB color
map projected  (47MB)
non-map           (185MB)

Merged IRB
map projected  (93MB)

Merged RGB
map-projected  (89MB)

RGB color
non map           (182MB)
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.