According to foreign media reports, two asteroids ten meters in diameter flew over the Earth on September 8 and 9, respectively, Beijing time , and the distance between and the Earth is less than the Earth-moon distance.
When the two asteroids are closest to Earth, they can be seen on the ground with a medium diameter amateur telescope. Thankfully, neither asteroid is on a collision course with Earth. Of the approximately 50 million undiscovered asteroids, one 10-meter diameter near-Earth asteroid is expected to enter Earth's Earth-moon orbit every day, but only one asteroid enters Earth's atmosphere every 10 years on average.
The two asteroids were discovered early on September 5 by the Katrina Sky Survey in Tucson, Arizona, during routine space surveillance. The Minor Planet Center in Massachusetts first received the observation report and conducted preliminary orbit determination. — The two asteroids will pass by perigee in three days, less than the Earth-Moon distance from Earth.
The two asteroids were named “ 2010 rx30” And “ 2010 rf12” 2010 rx30, with a diameter of 10-20 meters, reached perigee at 17:51 Beijing time on September 8, at which time it was 0.6 Earth-moon distance from the Earth, equivalent to 248,000 kilometers; 2010 rf12, with a diameter of 6 to 14 meters, reached perigee at 5:12 am Beijing time on September 9, when it was 0.2 Earth-Moon distance from Earth, equivalent to 79,000 kilometers.