Pre-discovery Activity of New Interstellar Comet 2I/Borisov beyond 5 au

  title={Pre-discovery Activity of New Interstellar Comet 2I/Borisov beyond 5 au},
  author={Quanzhi Ye and Michael S. P. Kelley and Bryce T. Bolin and Dennis Bodewits and Davide Farnocchia and Frank J. Masci and Karen J. Meech and Marco Micheli and Robert J. Weryk and Eric C. Bellm and Eric Christensen and Richard Dekany and Alexandre Delacroix and Matthew J. Graham and Shrinivas R. Kulkarni and Russ R. Laher and Ben Rusholme and Roger M. Smith},
  journal={The Astronomical Journal},
Comet 2I/Borisov, the first unambiguous interstellar comet ever found, was discovered in 2019 August at ~3 au from the Sun on its inbound leg. No pre-discovery detection beyond 3 au has yet been reported, mostly due to the comet's proximity to the Sun as seen from the Earth. Here we present a search for pre-discovery detections of comet Borisov using images taken by the Catalina Sky Survey, Pan-STARRS, and the Zwicky Transient Facility (ZTF), with a further comprehensive follow-up campaign… 

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