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New and existing UBVJHKs, spectroscopic, NOMAD, HST, and revised HIPobservations are employed to determine properties for delta Cep and its hoststar cluster. The multi-faceted approach ensured that uncertainties weremitigated (~2%). The following fundamental parameters were inferred for deltaCep: E(B-V)=0.073+-0.018, log(t)=7.9+-0.1, and d=272+-3(se)+-5(sd) pc. Thecluster exhibits a turnoff near B6 (M*/Ms~5), and the brightest host clustermembers are the supergiants zeta Cep (K1.5Ib) and delta Cep. To within theuncertainties, the two stars share common astrometric parameters (pi, mu_ra,mu_dec, RV\sim-17 km/s) and are tied to bluer members via the evolutionarytrack implied by the cluster's UBVJHKs color-color and color-magnitudediagrams. The cluster's existence is bolstered by the absence of an early-typesequence in color-magnitude diagrams for comparison fields. NOMAD data provideda means to identify potential cluster members (n~30) and double the existingsample. That number could increase with forthcoming precise proper motions(DASCH) for fainter main-sequence stars associated with classical Cepheids(e.g., delta Cep), which may invariably foster efforts to strengthen theGalactic Cepheid calibration and reduce uncertainties tied to H_0.

New Evidence Supporting Cluster Membership for the Keystone Calibrator Delta Cephei