  We analyze photometry and spectra of the "redback" millisecond pulsar binary
J2339$-$0533. These observations include new measurements from Keck and GROND,
as well as archival measurements from the OISTER, WIYN, SOAR, and HET
telescopes. The parameters derived from GROND, our primary photometric data,
describe well the rest of the datasets, raising our confidence in our fitted
binary properties. Our fit requires hot-spots (likely magnetic poles) on the
surface of the companion star, and we see evidence that these spots move over
the 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 the
radial-velocity fits) $K_{\rm C} = 347.0\pm 3.7\,$ $\mathrm{km\,s}^{-1}$, give
a fairly typical neutron star mass of $1.47\pm 0.09\,M_\odot$.
