  We analyze the VLT/UVES spectrum of the quasar SDSS J143907.5-010616.7,
retrieved from the UVES Spectral Quasar Absorption Database. We identify two
outflow systems in the spectrum: a mini broad absorption line (mini-BAL) system
and a narrow absorption line (NAL) system. We measure the ionic column
densities of the mini-BAL ($v=-1550$ km s$^{-1}$) outflow, which has excited
state absorption troughs of Fe II. We determine that the electron number
density $\log{n_e}=3.4^{+0.1}_{-0.1}$ based on the ratios between the excited
and ground state abundances of Fe II, and find the kinetic luminosity of the
outflow to be $\lesssim 0.1 \%$ of the quasar's Eddington luminosity, making it
insufficient to contribute to AGN feedback.
