Sols 4263-64, January 21-22, 2016. Opportunity’s Microscopic Imager made a two-sol portrait of the smooth, dark gray feature dubbed Joseph Collin, which appears to be a deposit of sand. Note the dimpled surface it shows. (To see the false-color Pancam view, go here.) Click image to enlarge.
Opportunity raw images, its latest mission status, a location map. and atmospheric opacity, known as tau.