2I/Borisov ( the “I” means“interstellar” and the 2 that the second observed interstellar "object" which came to our solar system after ʻOumuamua – was discovered 30 August by Gennadiy Borisov.
After the end of October passing by the Sun, 2I/Borisov will make its closest approach to Earth in late December at a distance of 1.9 astronomical units which is around 284 235 954 kilometers.
2I/Borisov's nucleus is surrounded by a coma, a cloud of dust and gas and about these rough estimates of its size are available, at the moment between 2 and 16km. Unless the comet fades or disintegrates unexpectedly, it should be observable until at least September 2020.
More detail about Borisov - https://en.wikipedia.org/wiki/2I/Borisov
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