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 with investigations in the center of the valley. Opportunity is finishing one of its final in-situ campaigns inside the valley.

On Sol 4413 (June 22, 2016), the rover continued with the investigation of the surface target 'York' with the collection of another set of Microscopic Imager (MI) mosaics followed by an offset placement of the Alpha Particle X-ray Spectrometer (APXS).

On the next sol, Opportunity continued with some targeted Panoramic Camera (Pancam) color imagery.

With the in-situ (contact) work complete at 'York,' the rover drove away with a 118 feet (36-meter) drive to the northwest. Before leaving the target, Opportunity snapped some 13-filter Pancam imagery of the in-situ work site.

However, due to relay bandwidth variability these Pancam images were not received on the ground. Other Pancam and Navigation Camera (Navcam) images of the north wall of Marathon Valley were collected and received.

The project is considering a drive back to 'York' to re-take these high-value Pancam images of the surface target.

As of Sol 4417 (June 27, 2016), the solar array energy production is 645.8 watt-hours with an atmospheric opacity (Tau) of 0.561 and a solar array dust factor of 0.725.

Total odometry is 26.63 miles (42.85 kilometers), more than a marathon.