Sept,1,2017 Asteroid 3122 Florence Flies by Earth Today 3122 Florence is an Amor-type asteroid with a diameter of 4-5 km. It makes a close approach today, September 1st, at a distance of 0.05 AU (7.1 million km). Florence is currently very bright, at 8.5 mag, visible in binoculars or a small telescope. No object of that size has come so close to Earth since the discovery of the first Near Earth asteroids over a century ago. We are following Florence closely during its exceptional flyby, and we w

Last night, projected measurement of Florence was 500 miles. The state of Montana measures 559 miles wide. | NBC Montana