We report on the characterization of a nearby ( d = 11.2 pc ) ultracool L dwarf ( WISE J192512.78+070038.8 ; hereafter W1925 ) identified as a faint ( G = 20.0 ) high proper motion ( 0 \farcs 22 yr ^ { -1 } ) object in the Gaia Data Releases 1 and 2 .
A Palomar/TripleSpec near-infrared spectrum of W1925 confirms a previously estimated photometric L7 spectral type by \citet Scholz18 , and its infrared colors and absolute magnitudes are consistent with a single object of this type .
We constructed a spectral energy distribution using the Gaia parallax , literature photometry and near infrared spectrum and find a luminosity log ( L _ { bol } / L _ { \odot } ) = -4.443 \pm 0.008 .
Applying evolutionary models , we infer that W1925 is likely a 53 \pm 18 M _ { Jup } brown dwarf with T _ { eff } =1404 \pm 71 K and \log { g } =5.1 \pm 0.4 dex ( cgs ) .
While W1925 was detected in both the 2MASS and WISE infrared sky surveys , it was not detected in photographic plate sky surveys .
Its combination of extreme optical-infrared colors , high proper motion , and location near the crowded Galactic plane ( b = -4 \fdg 2 ) likely contributed to it having evaded detection in pre- Gaia surveys .