During Borisov’s short travel through the inner part of the solar system, it was surrounded by its own delicate cloud of gas that was created as the sun heated up the ice on its surface. Observations of the gas cloud show that the carbon monoxide was more than three times as elevated as any local comet.
The origin of Borisov is still unknown to astronomers, who discovered it in August of 2019 on a path that came from somewhere in Cassiopeia. Researchers looked through the data from the Hubble and the Atacama Large Millimeter Array in Chile. These two observatories looked at Borisov a bit after it passed by the sun when it was just beyond the orbit of Mars last December.
Scientists believe that maybe Borisov formed and stayed cold all its existence, which is why it contained a lot of carbon monoxide. This conclusion means that Borisov was probably formed in the edges of a planetary system rich in carbon.
https://www.sciencenews.org/article/interstellar-comet-borisov-has-lots-carbon-monoxide
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