is a very small asteroid, classified as a near-Earth object of the Apollo group, that passed between Earth and the Moon on 8 September 2010, at 21:12 UTC, approaching Earth within above Antarctica. The asteroid was discovered by the Mount Lemmon Survey near Tucson, Arizona on 5 September 2010 along with . Based on a short 7-day observation arc from that apparation, it was listed for 12 years on the Sentry Risk Table as the asteroid with the greatest known probability (5%) of impacting Earth.Many small and harmless asteroids (less than ~10 meters in diameter) impact Earth every year but very few are discovered and predicted, see Asteroid impact prediction. was rediscovered in August 2022, and now has a 12-year observation arc and a much better known orbit. As of the December 2022 solution which accounts for nongravitational forces, there is a 1-in-10 chance of an Earth impact on 5 September 2095.

+Nominal Earth Approach on 6 September 2095 with a 12-year observation arc Date Impactprobability JPL Horizonsnominal geocentricdistance (AU) uncertaintyregion(3-sigma)2095-09-06 00:06 ± 00:20 1:10 ±180 thousand km

In 2023, was identified as a possible dark comet. Dark comets are asteroids that exhibit comet-like acceleration, but visually appear as asteroids, with no coma or tail. Astronomers who study them believe the acceleration is caused by outgassing on the sunlit side.

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. Around 6 September 2095 it will pass from Earth. An asteroid roughly 7-meters in diameter impacting Earth would cause very little danger of harm, but a rather impressive fireball is expected (estimated in the risk table as nearly 9 KT of energy release) as the rock airbursts in the upper atmosphere. Pebble sized fragments would likely fall to the ground at terminal velocity.How a Near-Earth Object Impact Might Affect Society, 9 January 2003, Clark R. Chapman, SwRI, Boulder CO USA The power of the airburst would be somewhere between the 2–4 m Sutter's Mill meteorite and the 17 m Chelyabinsk meteor (which had 440 KT equivalent energy). The approach in 2096 is poorly known because it is dependent on the September 2095 Earth approach.

+Virtual impactors with a 12-year observation arc Date Impactprobability(1 in) JPL Horizonsnominal geocentricdistance (AU) NEODySnominal geocentricdistance (AU) MPCnominal geocentricdistance (AU) Find_Orbnominal geocentricdistance (AU) uncertaintyregion(3-sigma)2095-09-05 23:46 10 ±180 thousand km2096-09-04 21:50 22000 ±414 million km

On 17 February 2059 the asteroid will pass within 3.5 million km from Earth and reach about apparent magnitude 22.6 by late February. On 10 September 1915 it passed from Earth.

See also , a similar-sized asteroid that passed Earth the same day , another near-Earth asteroid (may be Saturn V stage IV rocket booster)

Asteroid impact prediction List of asteroid close approaches to Earth, for other close approaches Earth-grazing fireball Meteoroid Dark comet

Notes

References (K10R12F)

RNG_3sigma = uncertainty range in km. (JPL#25/Soln.date: 2022-Dec-20 generates RNG_3sigma = for 2095-Sep-05 23:46.)

RNG_3sigma = uncertainty range in km. (JPL#25/Soln.date: 2022-Dec-20 generates RNG_3sigma = for 2095-Sep-06 00:06.)

(NEODyS Close Approach Table))

External links Risk corridor over Southern Hemisphere 2010 RF12: A second asteroid will buzz the Earth today, csmonitor.com, September 8, 2010 Early warning for close approaches of two house-sized asteroids, The Planetary Society, September 8, 2010