Outburst and Splitting of Interstellar Comet 2I/Borisov

  title={Outburst and Splitting of Interstellar Comet 2I/Borisov},
  author={David C. Jewitt and Yoonyoung Kim and Max Mutchler and H. Weaver and Jessica Agarwal and Man-To Hui},
  journal={The Astrophysical Journal},
We present Hubble Space Telescope observations of a photometric outburst and splitting event in interstellar comet 2I/Borisov. The outburst, first reported with the comet outbound at 2.8 AU (Drahus et al.~2020), was caused by the expulsion of solid particles having a combined cross-section about 100 sq. km and a mass in 0.1 mm sized particles about 2e7 kg. The latter corresponds to 1e-4 of the mass of the nucleus, taken as a sphere of radius 500 m. A transient ``double nucleus'' was observed on… 

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