2010 RF12
Description. NASA's Near Earth Program estimates its size to be in diameter with a mass of around 500 tonnes. will make many more close approaches to Earth, with the approach of 5–6 September 2095 having a 4.6% chance (1 in 22) of colliding with Earth. The nominal JPL Earth approach in 2095 is with Earth having a radius of approximately . The nominal NEODyS orbit has the asteroid passing from Earth on 6 September 2095, with an apparent magnitude of ~12. Due to the asteroid's relatively small size, there is very little danger of harm arising from  such an impact; rather there is expected to be an impressive fireball (estimated in the Risk table as nearly 9 KT of energy release) as the rock air bursts in the upper atmosphere and pebble sized fragments would likely fall to the ground at terminal velocity. The power of the airburst would be somewhere between the 2–4 m Sutter's Mill meteorite and the 17 m Chelyabinsk meteor(which was 440 KT equivalent energy). Possible August 2022 recovery. should be recoverable around its early August 2022 opposition and before the 23 September close approach of about . It will reach an apparent  magnitude of +24.0 to +24.7, and its position will have an uncertainty of roughly 10 arcminutes, 1/3rd the size of the full moon and within the field of view of imaging cameras on large telescopes. It should be detectable during that approach by telescopes of least 2 meters diameter in good observing sites, and the improvement of the orbit from the precise August 2022 position will verify or rule out possible future impacts for the next century or so.