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Unfortunately, timing constraints precluded an APXS integration today, as the instrument temperature would be too high to provide high-quality data. On the brighter side, removing the APXS activities from the plan freed up time for other activities, including a small MAHLI mosaic of a knobby outcrop. The knobby material is too rough to brush clean using the DRT, so we decided to shoot ChemCam's laser at a knob named "Cabo Sobral," expecting that the expanding plasma cloud generated by the laser will blow dust off the surface of the knob. Laser-induced dust clearing has occurred throughout the mission, and is therefore a viable alternative to DRT brushing.

The Sol 3485 plan starts with a Mastcam measurement of the dust content of the atmosphere above MSL and a large Mastcam mosaic extending coverage of the "Deepdale" hills toward the southeast, followed by the ChemCam 5-point raster on Cabo Sobral and Mastcam stereo observations of nearby trough features and a multispectral Mastcam observation of the (hopefully) cleaned surface of Cabo Sobral. Then Navcam will search for clouds and dust devils before MAHLI acquires a 3-frame mosaic from about 25 cm and a stereo image pair from about 7 cm of Cabo Sobral. The arm will then be stowed before a ~50-m drive toward the southeast. A SAM preconditioning activity is planned later that evening, followed by a DAN passive measurement.

The second sol of the plan starts with another DAN passive measurement and a ChemCam AEGIS activity, which will automatically select a bedrock target for a LIBS observation in the new rover location. Finally, MARDI will take an image of the ground behind the left front wheel during twilight. 

Written by Ken Herkenhoff, Planetary Geologist at USGS Astrogeology Science Center