Opportunity is wrapping up the exploration 'Marathon Valley' on the rim of Endeavour crater.

The rover did experience an unexpected drive termination caused by the right-front wheel. On Sol 4440 (July 20, 2016), tests were performed on the wheels and the rover backed up 4 feet (1.3 meters). All tests were nominal.

The project suspects it was a terrain interaction during a difficult turn in place for the rover. On Sol 4441 (July 21, 2016), Opportunity drove over 112 feet (34 meters) heading to the next waypoint.

As is typical, post-drive Navigation Camera (Navcam) and Panoramic Camera (Pancam) panoramas were collected. A full 360-degree Navcam panorama was completed on the next sol along with targeted Pancam imagery.

On Sol 4443 (July 23, 2016), the rover drove again, traveling almost 85 feet (26 meters), passing 26.72 miles (43 kilometers) of total odometry. More post-drive imagery was collected. A cloud movie was shot on the morning of Sol 4444 (July 24, 2015).

On Sol 4445 (July 25, 2016), Opportunity drove another 108 feet (33 meters) heading closer to its waypoint.

As of Sol 4445 (July 25, 2016), the solar array energy production is 605 watt-hours with an atmospheric opacity (Tau) of 0.599 and a solar array dust factor of 0.670.

Total odometry is 26.75 miles (43.05 kilometers).