Initial Characterization of Interstellar Comet 2I/2019 Q4 (Borisov)

  title={Initial Characterization of Interstellar Comet 2I/2019 Q4 (Borisov)},
  author={David C. Jewitt and Jane X. Luu},
  journal={The Astrophysical Journal},
  • D. Jewitt, J. Luu
  • Published 6 October 2019
  • Physics, Geology
  • The Astrophysical Journal
We present initial observations of the interstellar body 2I/(2019 Q4) Borisov taken to determine its nature prior to the perihelion in 2019 December. Images from the Nordic Optical Telescope show a prominent, morphologically stable dust coma and tail. The dust cross-section within 15,000 km of the nucleus averages 130 sq. km (assuming geometric albedo 0.1) and increases by about 1 percent per day. If sustained, this rate indicates that the comet has been active for 100 days prior to the… 

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