Nucleon electromagnetic form factors and axial charge from CLS Nf=2+1 ensembles

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We present preliminary results on the electromagnetic form factors and axial charge of the nucleon from ensembles generated by the CLS effort with Nf=2+1 flavours of non-perturbatively O(a)-improved Wilson fermions and open temporal boundary conditions. Systematic effects due to excited-state contamination are accounted for using both two-state fits and the method of summed operator insertions. This exploratory analysis demonstrates the viability of obtaining precision baryon observables with Nf=2+1 flavours of Wilson fermions on fine lattices, aiming towards controlled chiral and continuum limits in the future.