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We report the observation and physical characterization of the possible dwarfplanet \UZ\ ("DeeDee"), a dynamically detached trans-Neptunian objectdiscovered at 92 AU. This object is currently the second-most distant knowntrans-Neptunian object with reported orbital elements, surpassed in distanceonly by the dwarf planet Eris. The object was discovered with an $r$-bandmagnitude of 23.0 in data collected by the Dark Energy Survey between 2014 and2016. Its 1140-year orbit has $(a,e,i) = (109~\mathrm{AU}, 0.65,26.8^{\circ})$. It will reach its perihelion distance of 38 AU in the year2142. Integrations of its orbit show it to be dynamically stable on Gyrtimescales, with only weak interactions with Neptune. We have performedfollowup observations with ALMA, using 3 hours of on-source integration time tomeasure the object's thermal emission in the Rayleigh-Jeans tail. The signal isdetected at 7$\sigma$ significance, from which we determine a $V$-band albedoof $13.1^{+3.3}_{-2.4}\mathrm{(stat)}^{+2.0}_{-1.4}\mathrm{(sys)}$ percent anda diameter of $635^{+57}_{-61}\mathrm{(stat)}^{+32}_{-39}\mathrm{(sys)}$~km,assuming a spherical body with uniform surface properties.

Discovery and Physical Characterization of a Large Scattered Disk Object at 92 AU