Sol 4782, July 7, 2017; Rover Field Report by Larry Crumpler, MER Science Team & New Mexico Museum of Natural History & Science: With the latest drive on sol 4782, Opportunity began the long drive down the floor of Perseverance Valley here on Endeavour crater. This is rather historic in that it represents the first time that a rover has driven down an apparent water-cut valley on Mars. Over the next few months Opportunity will explore the floor and sides of the valley for evidence of the scale and timing of the fluvial activity, if that is what is represents.
First there is the little matter of solar conjunction in a couple of weeks. Opportunity needs to be parked in a good, secure spot for the two weeks that mission operations must stand down while Mars is behind the Sun. This current location will likely be the position during that stand down period. Opportunity achieved a good 10 degree northerly tilt, so this should be power-friendly. [More at link]