Mesa in Acidalia Region
NASA/JPL-Caltech/UArizona
Mesa in Acidalia Region
PSP_009709_2155  Science Theme: Landscape Evolution
This scene in the Acidalia Planitia contains a variety of features, the most prominent of which are two mesas (hills).

Several craters in the scene have bright material extending outward from their bottom left rims. These are wind streaks that mark the most recent dominant wind direction. The wind blows material out of the craters onto the adjacent plains.

At the bottom of the image are a cluster of craters. These might be secondary craters, which formed when ejecta from one impact hit the surface moving fast enough to create more craters. Secondary craters are identified partly by their occurrence in clumps and similar relative ages because all secondary craters from a single impact form at the same time.



Written by: Kelly Kolb  (17 December 2008)
 
Acquisition date
22 August 2008

Local Mars time
15:22

Latitude (centered)
35.273°

Longitude (East)
322.295°

Spacecraft altitude
293.7 km (182.5 miles)

Original image scale range
from 29.4 cm/pixel (with 1 x 1 binning) to 58.8 cm/pixel (with 2 x 2 binning)

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.3°

Phase angle
45.7°

Solar incidence angle
46°, with the Sun about 44° above the horizon

Solar longitude
116.1°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  2.9°
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   (945MB)

IRB color
map-projected   (598MB)

JP2 EXTRAS
Black and white
map-projected  (388MB)
non-map           (277MB)

IRB color
map projected  (236MB)
non-map           (504MB)

Merged IRB
map projected  (305MB)

Merged RGB
map-projected  (292MB)

RGB color
non map           (494MB)
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-Caltech/UArizona

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.