Fans of Roddy Crater
NASA/JPL/UArizona
Fans of Roddy Crater
ESP_033471_1580  Science Theme: Sedimentary/Layering Processes
Alluvial fans are found on Earth, Mars, and even Saturn’s moon, Titan. Roddy Crater on Mars is home to several large alluvial fans, which formed as water moved sediment from the mountainous crater rim and deposited it onto the flatter crater floor.

The fans built up over time during intense rain storms or from melting snow. Due to the strong winds on Mars, the river channels that once carried water and sediment on the fan surfaces are now standing as raised ridges and platforms. A thin blanket of ejecta (upper right) from a small crater on Roddy’s eastern rim protected underlying fan surfaces from modification by the wind compared to nearby, unprotected fans (left in the previous image). The scarp beneath the thin ejecta surface exposes beautiful light-toned layers from the alluvial fans below.



Written by: Sharon Wilson Purdy (audio: Tre Gibbs)  (23 July 2018)

This is a stereo pair with ESP_028579_1580.
 
Acquisition date
16 September 2013

Local Mars time
14:46

Latitude (centered)
-21.755°

Longitude (East)
320.725°

Spacecraft altitude
257.2 km (159.9 miles)

Original image scale range
27.8 cm/pixel (with 1 x 1 binning) so objects ~83 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
21.6°

Phase angle
37.2°

Solar incidence angle
51°, with the Sun about 39° above the horizon

Solar longitude
22.7°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  41.2°
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   (1774MB)

IRB color
map-projected   (1011MB)

JP2 EXTRAS
Black and white
map-projected  (1035MB)
non-map           (909MB)

IRB color
map projected  (391MB)
non-map           (750MB)

Merged IRB
map projected  (453MB)

Merged RGB
map-projected  (458MB)

RGB color
non map           (737MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

DIGITAL TERRAIN MODEL (DTM)
DTM 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.