Opportunity is within 'Marathon Valley' on the west rim of Endeavour Crater conducting a valley floor survey for clay minerals before moving to the winter location on the south side of the valley.
The rover just completed a 9-sol test using the Flash file system on Sol 4155 (Oct. 1, 2015). On Sol 4154 (Sept. 30, 2015), a Flash-related reset prevented the rover from driving that sol.
On Sol 4155 (Oct. 1, 2015), the rover returned to RAM-only mode (no Flash for storage) and the drive originally planned for the previous sol successfully completed on this sol achieving 28 feet (8.5 meters).
Post-drive Navigation (Navcam) Camera panoramas were collected. On the next sol, a targeted color Panoramic (Pancam) Camera panorama was collected. On Sol 4157 (Sept. 3, 2015), Opportunity drove again, performing a dog-leg maneuver to avoid some obstacles. More color Pancam panoramas were collected. T
his was followed on the next sol with more Navcam panoramas. On Sol 4159 (Sept. 5, 2015), the rover moved again toward the east, traveling over 48 feet (14.5 meters).
As with the other recent drives, pre- and post-drive Pancam and Navcam panoramas were collected.
As of Sol 4161 (Sept. 7, 2015), the solar array energy production was 327 watt-hours with an atmospheric opacity (Tau) of 0.553 and a solar array dust factor of 0.569.
Total odometry is 26.46 miles (42.59 kilometers), more than a marathon.
