HiRISE | Halos and Fracture Lines (ESP_076606

NASA/JPL-Caltech/UArizona

Halos and Fracture Lines
ESP_076606_0935 Science Theme: Polar Geology

This image was acquired in the very late southern summer at an incidence angle of 83.5 degrees (the sun was just 6.5 degrees above the horizon). Rather than being uniformly bright, the high-standing flat areas are brightest near the margins of pits and darker in interior regions.

This pattern may result from deposition or removal of dust and/or carbon dioxide frost. Bright lines probably marking fractures can be seen over the relatively dark high-standing areas.

Written by: Alfred McEwen (17 January 2023)

Acquisition date
29 November 2022

Local Mars time
17:18

Latitude (centered)
-86.387°

Longitude (East)
21.947°

Spacecraft altitude
248.5 km (154.5 miles)

Original image scale range
49.7 cm/pixel (with 2 x 2 binning) so objects ~149 cm across are resolved

Map projected scale
50 cm/pixel

Map projection
Polarstereographic

Emission angle
1.9°

Phase angle
84.6°

Solar incidence angle
84°, with the Sun about 6° above the horizon

Solar longitude
346.2°, Northern Winter

For non-map projected images
North azimuth: 133°
Sub-solar azimuth: 53.5°

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   (336MB)

IRB color
map-projected   (201MB)

JP2 EXTRAS
Black and white
map-projected (205MB)
non-map           (282MB)

IRB color
map projected (83MB)
non-map           (180MB)

Merged IRB
map projected (282MB)

Merged RGB
map-projected (263MB)

RGB color
non map           (161MB)

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.