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We report on initial results from 20 days’ worth of Transiting Exoplanet Survey Satellite 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 , while dust expanded at only 10s of . Coadded images also revealed a previously unreported dust trail that extends beyond the 24° field of view.
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Farnham et al. (2019) studied this question.
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