We present \lambda / { \Delta } { \lambda } \sim 6000 near–infrared spectroscopy of the nearby T9 dwarf , UGPS J072227.51 - 054031.2 , obtained during the commissioning of the Folded–Port Infrared Echellette Spectrograph on the Baade Magellan telescope at Las Campanas Observatory . The spectrum is marked by significant absorption from H _ { 2 } O , CH _ { 4 } and H _ { 2 } . We also identify NH _ { 3 } absorption features by comparing the spectrum to recently published line lists . The spectrum is fit with BT-Settl models , indicating T _ { eff } \sim 500 - 600 K and \log { g } \sim 4.3 - 5.0 . This corresponds to a mass of \sim 10 - 30 \cal { M } _ { Jup } and an age of 1 - 5 Gyr , however there are large discrepancies between the model and observed spectrum . The radial and rotational velocities of the brown dwarf are measured as 46.9 \pm 2.5 and 40 \pm 10 km s ^ { -1 } , respectively , reflecting a thin disk Galactic orbit and fast rotation similar to other T dwarfs , suggesting a young , possibly planetary-mass brown dwarf .