The paper on C/2016 R2 is partially based on this one published in 2019:
McKay et al.: The Peculiar Volatile Composition of CO-Dominated Comet C/2016 R2
(PanSTARRS), https://arxiv.org/abs/1907.07208

It is quite interesting to remember the outstanding pre-perihelion light curve
of this comet, showing no activity before entering a solor distance of 3.2 AU.

> Am Thu, 10 Dec 2020 22:36:52 -0000
> schrieb Richard Miles - rmiles.btee at btinternet.com (via baa-comet list) <baa-comet@simplelists.com>:
>
> Thanks Jeremy,
>
> Some high-powered stuff in both those papers.
> The Far-UV spectroscopy with HST in the first paper is astonishingly good and some surprising results on 46P.
> The second paper shows that C/2016 R2 has a coma dominated by CO and N2 with H2O a hundred times less abundant, making it something of an oddity.
>
> Richard
>   ----- Original Message -----
>   From: Jeremy Shears
>   To: baa-comet@simplelists.com
>   Sent: Thursday, December 10, 2020 9:21 AM
>   Subject: [BAA Comets] Two recent ArXiv papers
>
>
>   FUV Observations of the Inner Coma of 46P/Wirtanen
>
>
>   John W. Noonan, Walter M. Harris, Steven Bromley, Davide Farnocchia, Jian-Yang Li, Kathleen E. Mandt, Joel Wm. Parker, Kumar Venkataramani, Dennis Bodewits
>
>   https://arxiv.org/abs/2012.04619
>
>
>
>
>
>   A physico-chemical model to study the ion density distribution in the inner coma of comet C/2016 R2(Pan-STARRS)
>
>
>   Susarla Raghuram, Anil Bhardwaj, Damien Hutsemékers, Cyrielle Opitom, Jean Manfroid, Emmanuel Jehin
>
>   https://arxiv.org/abs/2012.04611
>
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