Asteroid larger than three Salesforce buildings to fly close to Earth - SF Gate

Amateur astronomers can spot the asteroid with a backyard telescope hours after the close approach in the evening (get tips from Earth Sky).

By comparison, the asteroid that is believed to have wiped out the dinosaurs was over 32,000 feet wide, McKeegan said.

Although 7482 is still large and will come close to Earth, McKeegan said that "there is no risk of impact on this or any future close approaches for at least 200 years.".

In the event an Earth-threatening asteroid is discovered in the future, NASA's Double Asteroid Redirection Test (DART) mission is expected to deliberately crash into a near-Earth asteroid in September to test technology for deflecting asteroids out of orbit