Fans on Lobes in the Argyre Region
Fans on Lobes in the Argyre Region
ESP_020892_1275  Science Theme: Seasonal Processes
Previous images show fans on some lobate (ear-shaped) features but not on others. One of the additional reasons to image this area is to to monitor the defrosting process. At the resolution of HiRISE, we are able to see surface and fan details, like in this subimage.

The Argyre Region is a large impact basin that also contains other geologic features, such as polygonal impact craters. The basin is surrounded by heavily cratered highlands.

This caption is based on the original science rationale.

Written by: HiRISE Science Team  (1 February 2011)
Acquisition date
10 January 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
252.2 km (156.7 miles)

Original image scale range
25.3 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
59°, with the Sun about 31° above the horizon

Solar longitude
214.6°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  23.6°
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   (569MB)

IRB color
map-projected   (244MB)

Black and white
map-projected  (205MB)
non-map           (376MB)

IRB color
map projected  (64MB)
non-map           (269MB)

Merged IRB
map projected  (143MB)

Merged RGB
map-projected  (136MB)

RGB color
non map           (264MB)
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/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.