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We present an analysis of long-slit cometary spectroscopy using the dual-armISIS spectrograph on the 4.2 m WHT. Eleven comets were observed over two nightsin 2016 March and we detected the OH (0-0) emission band at 3085 {\AA} in thespectra of five of these comets. Emission bands of the species NH, CN, C$_{3}$,C$_{2}$, NH$_{2}$ and [OI] were also detected. We used Haser modelling todetermine molecular production rates and abundance ratios for the observedspecies. We found that our average abundances relative to OH and CN weregenerally consistent with those measured in previous studies.

Near-UV and optical spectroscopy of comets using the ISIS spectrograph on the WHT