Bodies observed passing through the Solar System on a trajectory that shows they originated outside it and are not gravitationally bound to the Sun, such as 1I/Oumuamua and 2I/Borisov. Belongs here: any confirmed interstellar visitor. Does not belong here: any body in a bound solar orbit, however unusual, which belongs under Comets, Asteroids and Minor Planets or Trans-Neptunian and Outer Solar System Objects instead.
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Sources
1. Wikipedia: 1I/Oumuamua
Wikimedia Foundation1I/Oumuamua, lead sectionQuote, 1I/Oumuamua, lead section
1I/Oumuamua is the first confirmed interstellar object detected passing through the Solar System. Formally designated 1I/2017 U1, it was discovered by Canadian physicist Robert Weryk using the Pan-STARRS telescope at Haleakala Observatory, Hawaii, on 19 October 2017, approximately 40 days after it passed its closest point to the Sun on 9 September.
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