Initial characterization of interstellar comet 2I/Borisov

@article{Guzik2019InitialCO,
  title={Initial characterization of interstellar comet 2I/Borisov},
  author={Piotr Guzik and Michał Drahus and Krzysztof Rusek and Wacław Waniak and Giacomo Cannizzaro and In{\'e}s Pastor-Marazuela},
  journal={Nature Astronomy},
  year={2019},
  volume={4},
  pages={53-57}
}
Interstellar comets penetrating through the Solar System had been anticipated for decades 1 , 2 . The discovery of asteroidal-looking ‘Oumuamua 3 , 4 was thus a huge surprise and a puzzle. Furthermore, the physical properties of the ‘first scout’ turned out to be impossible to reconcile with Solar System objects 4 – 6 , challenging our view of interstellar minor bodies 7 , 8 . Here, we report the identification and early characterization of a new interstellar object, which has an evidently… 
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