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We have measured dramatic flux and spectral variations through the 0.193dorbit of the optical counterpart of the unidentified gamma-ray source 0FGLJ2339.8-0530. This compact object companion is strongly heated, with T_effvarying from ~6900K (superior conjunction) to <3000K at minimum. A combined fitto the light curve and radial velocity amplitudes implies M_1 ~ 0.075M_sun, M_2~ 1.4 M_sun and inclination i ~ 57deg. Thus this is a likely `black widow'system with Edot~10^{34-34.5} erg/s pulsar driving companion mass loss. Thiswind, also suggested by the X-ray light curve, may prevent radio pulsedetection. Our measurements constrain the pulsar's reflex motion, increasingthe possibility of a pulse detection in the gamma-ray signal.

The Orbit and Companion of Probable gamma-ray Pulsar J2339-0533