Comet Borisov entered the Solar System from the direction of Cassiopeia near the border with Perseus, and originates from the galactic plane. Dr Karen Meech, Institute for Astronomy, Honolulu, & Dr David Livingston, The Space Show


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Image: A comparison of two interstellar objects passing through our solar system, including Comet Borisov (yellow line).
Hotel Mars, episode n, with Dr Karen Meech, Institute for Astronomy, Honolulu, and Dr David Livingston, The Space Show. They discuss interstellar visitors. ‘Omuamua, a cigar-shaped asteroid, and Comet Borisov.
2I/Borisov, originally designated C/2019 Q4 (Borisov), is the first observed interstellar comet and the second observed interstellar interloper after ʻOumuamua. 2I/Borisov has a heliocentric orbital eccentricity of 3.3 and is not bound to the Sun. The comet will pass through the ecliptic of the Solar System in December 2019, with the closest approach to the Sun at just under 2 au on 8 December 2019.
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