An "unknown space mass has been dubbed "2020 SO," and is set to fly by our planet at an extremely close, but safe, distance of 31,605 miles at 3:50 AM ET December 1.
The object was discovered by the Pan-STARRS survey in Hawaii back in September, and initially, it was believed to be an asteroid measuring an estimated 15-33 feet across."
https://www.tmz.com/2020/11/30/myste...sa-december-1/
Stony asteroids with a diameter of 4 meters (13 ft) enter Earth's atmosphere about once a year.[19] Asteroids with a diameter of 7 meters enter the atmosphere about every 5 years with as much kinetic energy as the atomic bomb dropped on Hiroshima (approximately 16 kilotons of TNT), but the air burst is reduced to just 5 kilotons.[19] These ordinarily explode in the upper atmosphere and most or all of the solids are vaporized.[22] However, asteroids with a diameter of 20 m (66 ft), and which strike Earth approximately twice every century, produce more powerful airbursts. The 2013 Chelyabinsk meteor was estimated to be about 20 m in diameter with an airburst of around 500 kilotons, an explosion 30 times the one over Hiroshima.
https://en.wikipedia.org/wiki/Impact_event