We have used the Palomar 200 ” Adaptive Optics ( AO ) system to directly detect the astrometric brown dwarf GJ 802B reported by Pravdo et al .
2005 .
This observation is achieved with a novel combination of aperture masking interferometry and AO .
The dynamical masses are 0.175 \pm 0.021 M _ { \odot } and 0.064 \pm 0.032 M _ { \odot } for the primary and secondary respectively .
The inferred absolute H band magnitude of GJ 802B is M _ { H } =12.8 resulting in a model-dependent T _ { \mathrm { eff } } of 1850 \pm 50K and mass range of 0.057–0.074 M _ { \odot } .