Opportunity is exploring 'Marathon Valley' on the rim of Endeavour crater, investigating outcrops for evidence of clay minerals.

The rover is nearing the completion of its exploration within Marathon Valley. On Sol 4426 (July 6, 2016), Opportunity drove 51 feet (15.45 meters) to the northwest.

As with each drive, the rover collects post-drive Navigation Camera (Navcam) panoramas to support the next drive. The rover used the next sol for a Flash bank readout and some targeted Panoramic Camera (Pancam) imagery.

More targeted imagery was also collected over the next two sols.

On Sol 4430 (July 10, 2016), Opportunity drove 27 feet (8.33 meters) towards a rock target of interest. More post-drive Navcam panoramas were collected.

On Sol 4432 (July 12, 2016), the rover bumped every-so-slightly (~1 cm) to position for in-situ (contact) work on the rock target.

As of Sol 4432 (July 12, 2016), the solar array energy production is 609.6 watt-hours with an atmospheric opacity (Tau) of 0.596 and a solar array dust factor of 0.718.

Total odometry is 26.68 miles (42.94 kilometers), more than a marathon.