Comet C/2019 Q4 as imaged by the Canada-France-Hawaii Telescope on Hawaii's Big Island on Sept. 10, 2019.

Credits: Canada-France-Hawaii Telescope

New interstellar comet

2I/Borisov is an interstellar comet discovered on 30 August 2019 by amateur astronomer Gennady Borisov. It is inbound to our Solar System and will approach perihelion in early December 2019. As a bright (~10km) object producing cometary outbursts, this interstellar visitor will be valuable subject of study throughout most of 2020.


arXiv - Interstellar comet C/2019 Q4 (Borisov) (Guzik, Drahus, Rusek, Waniak, Cannizzaro, Pastor-Marazuela 2019)