Sol 4148, September 25, 2015. The rover’s Pancam took a sequence of filtered frames on the target dubbed Pvt. Robert Frazer. Previously, this target was brushed, then drilled by the Rock Abrasion Tool (RAT), which removed the top surface of the outcrop (false-color composite by Holger Isenberg).
The outcrop is part of Opportunity’s survey of the floor of Marathon Valley, as it looks for phyllosilicate (clay) minerals detected by remote sensing from orbit.
Opportunity raw images, its latest mission status, a location map. and atmospheric opacity, known as tau.