[BAA Comets] Two comet paper pre-prints on ArXiv

[Jeremy Shears]

High resolution optical spectroscopy of the N2-rich comet C/2016 R2 (PanSTARRS)   https://arxiv.org/abs/1901.00657
Says "In some ways, R2 is similar to comets 29P/Schwassmann-Wachmann and C/2002 VQ94 (LINEAR), which are both distant active comets displaying clear
N2+ and CO+ emission lines.

Turning up the heat on `Oumuamua   https://arxiv.org/abs/1901.00508
Asks whether known comets that have passed close to the Sun could have been extra-solar in origin, but concludes none are particularly likely to have been.

Jeremy

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