A Fan with Inverted Channels
A Fan with Inverted Channels
ESP_055505_1520  Science Theme: Fluvial Processes
This image shows inverted channels within a fan whose origin could be either fluvial (produced by the action of a stream) or alluvial (created by sedimentary deposits).

If the fan is alluvial, then it formed on dry land. If the fan is fluvial, then it could have formed in water, like a delta. Similar fans with inverted channels are found in Eberswalde and Jezero craters, both of which are interpreted as deltas and are considered candidate locations of future rover landing sites.

Written by: Cathy Weitz (audio: Tre Gibbs)  (4 September 2018)

This is a stereo pair with ESP_055360_1520.
Acquisition date
30 May 2018

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
256.4 km (159.3 miles)

Original image scale range
29.0 cm/pixel (with 1 x 1 binning) so objects ~87 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
56°, with the Sun about 34° above the horizon

Solar longitude
184.5°, Northern Autumn

For non-map projected images
North azimuth:  95°
Sub-solar azimuth:  26.5°
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Black and white
map-projected  (455MB)
non-map           (484MB)

IRB color
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non-map           (433MB)

Merged IRB
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Merged RGB
map-projected  (283MB)

RGB color
non map           (427MB)
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

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Color label
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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

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NASA/JPL/University of Arizona

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.