Frost all over Louth Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)

This image shows the changing Seasonal Frost Patterns on Louth Crater, located at about 70° North Latitude, in the Martian Region of Vastitas Borealis. This Crater contains a Mound (---> terrapieno) covered by Water Frost that persists throughout the year (which is an unusual circumstance for this Latitude); however, even the Seasonal Carbon Dioxide (CO2) Frost deposited during the Northern Winter can reach such a Latitude. At the time this image was acquired (such as during the Northern Spring), the Carbon Dioxide Frost was in the process of sublimating back into the Martian Atmosphere. Note that there are Sand Dunes near the edge of the Mound, which become clear of Frost in the Summer.

Mars Local Time: 14:32 (Early Afternoon)
Coord. (centered): 70,228° North Lat. and 103,538° East Long.
Spacecraft altitude: 316,2 Km (such as about 197,6 miles)
Original image scale range: 31,6 cm/pixel (with 1 x 1 binning) so objects ~ 95 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: POLAR STEREOGRAPHIC
Emission Angle: 1,7°
Sun - Mars - MRO (or "Phase") Angle: 54,7°
Solar Incidence Angle: 56° (meaning that the Sun is about 34° above the Local Horizon)
Solar Longitude: 50,3° (Northern Spring - Southern Autumn)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer Italia