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Using the Gemini Planet Imager (GPI) located at Gemini South, we measured thenear-infrared (1.0-2.4 micron) spectrum of the planetary companion to thenearby, young star $\beta$ Pictoris. We compare the spectrum obtained withcurrently published model grids and with known substellar objects and presentthe best matching models as well as the best matching observed objects.Comparing the empirical measurement of the bolometric luminosity toevolutionary models, we find a mass of $12.9\pm0.2$ $\mathcal{M}_\mathrm{Jup}$,an effective temperature of $1724\pm15$ K, a radius of $1.46\pm0.01$$\mathcal{R}_\mathrm{Jup}$, and a surface gravity of $\log g = 4.18\pm0.01$[dex] (cgs). The stated uncertainties are statistical errors only, and do notincorporate any uncertainty on the evolutionary models. Using atmosphericmodels, we find an effective temperature of $1700-1800$ K and a surface gravityof $\log g = 3.5$-$4.0$ [dex] depending upon model. These values agree wellwith other publications and with "hot-start" predictions from planetaryevolution models. Further, we find that the spectrum of $\beta$ Pic b bestmatches a low-surface gravity L2$\pm$1 brown dwarf. Finally comparing thespectrum to field brown dwarfs we find the the spectrum best matches 2MASSJ04062677-381210 and 2MASS J03552337+1133437.

1 to 2.4 micron Near-IR spectrum of the Giant Planet $\beta$ Pictoris b obtained with the Gemini Planet Imager