Martian Sands Scott Rowland TGIF Groundhog day, 2019 Mastcam image of Namib dune

Navcam image of robotic arm with the MAHLI camera over a target named Barby, on sol 1184 (late 2015). At 3 cm from the surface, the spatial resolution is 24 μm pixel-1 MAHLI (w/ lens cover closed) MAHLI: 1600 x 1200 pixels Focus from 1.6 cm to ∞ 13.9 µm pixel-1 at closest (24.15 µm pixel-1 at 3 cm) Red visible to UV LEDs (vis. and UV) for night work 34° field of view On turret, on 2.2 m- long arm Edgett et al. (2012) Space Science Reviews 170:259- 317 MAHLI

MAHLI image from 3 cm (24.15 μm pixel-1) 96% of all grains are 0.2 – 0.55 mm across (median = 0.33 mm; medium sand)