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An analysis of currently available ammonia (NH$_3$) visible-to-near-infraredgas absorption data was recently undertaken by Irwin et al. (Icarus, 302 (2018)426) to help interpret Very Large Telescope (VLT) MUSE observations of Jupiterfrom 0.48 - 0.93 $\mu$m, made in support of the NASA/Juno mission. Since thisanalysis a newly revised set of ammonia line data, covering the previouslypoorly constrained range 0.5 - 0.833 $\mu$m, has been released by the ExoMolproject, "C2018" (Coles et al., JQSRT 219, 199 - 122, 2018), which demonstratessignificant advantages over previously available data sets, and providing forthe first time complete line data for the previously poorly constrained 5520-and 6475-\AA\ bands of NH$_3$. In this paper we compare spectra calculatedusing the ExoMol-C2018 data set (Coles et al., JQSRT 219, 199 - 122, 2018) withspectra calculated from previous sources to demonstrate its advantages. Weconclude that at the present time the ExoMol-C2018 dataset provides the mostreliable ammonia absorption source for analysing low- to medium-resolutionspectra of Jupiter in the visible/near-IR spectral range, but note that thedata are less able to model high-resolution spectra owing to small, butsignificant inaccuracies in the line wavenumber estimates. This work is ofsignificance not only for solar system planetary physics, but for futureproposed observations of Jupiter-like planets orbiting other stars, such aswith NASA's planned Wide-Field Infrared Survey Telescope (WFIRST).

Analysis of gaseous ammonia (NH$_3$) absorption in the visible spectrum of Jupiter - Update