[BAA Comets] Two ArXiv papers on 2I/Borisov

[Jeremy Shears]

Sublimation of Water Ice from a Population of Large, Long-Lasting Grains Near the Nucleus of 2I/Borisov?
by Zdenek Sekanina
https://arxiv.org/abs/1911.06271

Pre-discovery Activity of New Interstellar Comet 2I/Borisov Beyond 5 AU
by Quanzhi Ye et al
https://arxiv.org/abs/1911.05902


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