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We analyze photometry and spectra of the "redback" millisecond pulsar binaryJ2339$-$0533. These observations include new measurements from Keck and GROND,as well as archival measurements from the OISTER, WIYN, SOAR, and HETtelescopes. The parameters derived from GROND, our primary photometric data,describe well the rest of the datasets, raising our confidence in our fittedbinary properties. Our fit requires hot-spots (likely magnetic poles) on thesurface of the companion star, and we see evidence that these spots move overthe 8 yr span of our photometry. The derived binary inclination $i =69.3^\circ\pm 2.3^\circ$, together with the center-of-mass velocity (from theradial-velocity fits) $K_{\rm C} = 347.0\pm 3.7\,$ $\mathrm{km\,s}^{-1}$, givea fairly typical neutron star mass of $1.47\pm 0.09\,M_\odot$.

Heated Poles on the Companion of Redback PSR J2339$-$0533