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Linares et al. (2016) obtained quasi-simultaneous g', r' and i-band lightcurves and an absorption line radial velocity curve of the secondary star inthe redback system 3FGL J0212.1+5320. The light curves showed two maxima andminima primarily due to the secondary star's ellipsoidal modulation, but withunequal maxima and minima. We fit these light curves and radial velocities withour X-ray binary model including either a dark solar-type star spot or a hotspot due to off-centre heating from an intrabinary shock, to account for theunequal maxima. Both models give a radial velocity semi-amplitude androtational broadening that agree with the observations. The observed secondarystar's effective temperature is best matched with the value obtained using thehot spot model, which gives a neutron star and secondary star mass of $M_{\rm1}$=1.85$^{+0.32}_{-0.26}$ $M_{\odot}$and $M_{\rm 2}$=0.50$^{+0.22}_{-0.19}$$M_{\odot}$, respectively.

Properties of the redback millisecond pulsar binary 3FGL J0212.1+5320