Borisov

Type: Concept

As of November 2026, Borisov has been mentioned in one podcast episode on Dr. Becky (Dec 2025).

2I/Borisov, originally designated C/2019 Q4 (Borisov), is the first observed rogue comet and the second observed interstellar interloper, after ʻOumuamua. It was discovered by the amateur astronomer and telescope maker Gennadiy Borisov on 29 August 2019 UTC in MARGO Observatory.

Borisov at a glance
Mentioned in	1 episode on 1 podcast (as of November 2026)
First heard	Dec 2025 on Dr. Becky

Who talks about Borisov on podcasts?

Borisov came up; the most recent mention was Dec 2025 on Dr. Becky.

The largest rotating structure ever found in the Universe | Night Sky News December 2025 on Dr. Becky (Dec 2025)

What is Borisov mentioned alongside?

Borisov is most often mentioned alongside International Space Station (ISS), Ground News and Dr. Becky Smith.

Mentioned together: International Space Station (ISS), Ground News, Dr. Becky Smith, Hubble Space Telescope, JWST, Quadrantids, Muam Mua, South African MeerKAT, JUICE