In October 2017, an object moving rapidly through the Solar System was observed by Pan-STARRS 1 (discovery image, 19 October 2017), Canada-France-Hawaii Telescope (22 October 2017) and various other telescopes.
It appears to be a dark, reddish, highly-elongated rocky or high-metal-content object. Astronomers calculated it is around 800 metres long and has a mean radius of around 104 metres. The orbit calculations revealed it did not originate from inside the Solar System, instead Oumuamua is the first interstellar asteroid discovered.
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