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Florence is the largest asteroid to pass this close to our planet since the first near-Earth asteroid was discovered over a century ago.Asteroid 3122 Florence will safely pass by our planet on September 1, 2017 at over 18 times the Earth-moon distance. The asteroid will not be visible to the unaided eye. It will, however, become visible in small amateur telescopes by late August, in the course of what will become the closest encounter to Earth by this asteroid since 1890.
Comment: This video has been uploaded on the American Meteor Society Website. AMS Event: 2563-2017, Report 117061. Location is Marssac-sur-Tarn.