Visible spectrum of comet C/2016 R2 (PanSTARRS) obtained by H. Boussier on 22.93 December 2018 UT with a 0.28 m telescope + LISA spectrometer and Atik 414L. The wavelengths covered are from 385 to 655 nm (from left to right). Vertical lines are atmospheric lines, mostly due to light pollution, while the cometary lines (mostly CO+ doublets) are less extended vertically. Scattering of the light of the mercury vapour lamps (Hg-I lines at 404.7, 435.8, 546.1, and 577+579 nm) and high pressure sodium lamps (568 nm line and broad emission around 589 nm) are the dominating sky emissions.
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