  We present {\lambda}/{\Delta}{\lambda} ~ 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 H2O, CH4 and H2. We also identify NH3 absorption
features by comparing the spectrum to recently published line lists. The
spectrum is fit with BT-Settl models, indicating Teff ~ 500-600 K and log g ~
4.3-5.0. This corresponds to a mass of ~ 10-30 MJup 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, respectively, reflecting a thin disk Galactic orbit
and fast rotation similar to other T dwarfs, suggesting a young, possibly
planetary-mass brown dwarf.
