  We report on initial results from 20 days' worth of TESS spacecraft
observations of comet 46P/Wirtanen. The long-duration, high-cadence
measurements show a 2018 September 26 outburst that exhibited a two-phase, 0.5
mag brightening profile, and may be the best temporally characterized natural
outburst ever recorded. Gas velocities from the outburst peaked at 800 m
s$^{-1}$, while dust expanded at only 10s of m s$^{-1}$. Coadded images also
revealed a previously unreported dust trail that extends beyond the 24$^\circ$
field of view.
