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We present measurements of comet 46P/Wirtanen obtained by the NEOWISE spacecraft in 2017 through 2019. We detected signal in excess of the dust in the 4.6  μ m channel attributable to the presence of CO, or more likely, CO 2  emission. The excess, when the comet was outbound at a heliocentric distance of 1.9 au, was consistent with a CO 2  production rate of 1.3(±0.07) × 10 26  molecules per second, which is equivalent to an active area on the order of a percent of the comet nucleus’ total surface.

NEOWISE Observed CO and CO2 Production Rates of 46P/Wirtanen During the 2018–2019 Apparition*

NEOWISE Observed CO and CO₂ Production Rates of 46P/Wirtanen During the 2018–2019 Apparition*