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We present new Gemini Planet Imager observations of the young exoplanet 51Eridani b which provide further evidence that the companion is physicallyassociated with 51 Eridani. Combining this new astrometric measurement withthose reported in the literature, we significantly reduce the posteriorprobability that 51 Eridani b is an unbound foreground or background T-dwarf ina chance alignment with 51 Eridani to $2\times10^{-7}$, an order of magnitudelower than previously reported. If 51 Eridani b is indeed a bound object, thenwe have detected orbital motion of the planet between the discovery epoch andthe latest epoch. By implementing a computationally efficient Monte Carlotechnique, preliminary constraints are placed on the orbital parameters of thesystem. The current set of astrometric measurements suggest an orbitalsemimajor axis of $14^{+7}_{-3}$ AU, corresponding to a period of$41^{+35}_{-12}$ years (assuming a mass of $1.75$ $M_{\odot}$ for the centralstar), and an inclination of $138^{+15}_{-13}$ deg. The remaining orbitalelements are only marginally constrained by the current measurements. Thesepreliminary values suggest an orbit which does not share the same inclinationas the orbit of the distant M-dwarf binary, GJ 3305, which is a wide physicallybound companion to 51 Eridani.

Astrometric Confirmation and Preliminary Orbital Parameters of the Young Exoplanet 51 Eridani b with the Gemini Planet Imager