A newly-discovered asteroid designated 2021 RS2 will fly by Earth at a distance of just 0.06 LD / 0.00015 AU (22 440 km / 13 945 miles) from the center of our planet at 07:28 UTC on September 8, 2021.
This is the 81st known asteroid to fly by Earth within 1 lunar distance since the start of the year.
It is also the closest flyby of the year and the 21st closest on record, sharing the place with 2021 CZ3 which flew past us on February 9, 2021. It's worth noting that two closest flybys on record took place in 2020 -- 2020 QG on August 16 and 2020 VT4 on November 13.
This flyby will be followed by 2021 RP2 at 13:50 UTC today at a distance of 0.31 LD and 2021 RQ2 at 00:44 UTC on September 9 at a distance of 0.49 LD.
2021 RS2 was first observed at Mt. Lemmon Survey on September 7, one day before the close approach to our planet.
The object belongs to the Apollo group of asteroids and has an estimated diameter between 2.3 and 5.1 m (7.5 - 16.7 feet).
The close approach will take place at 07:28 UTC ± 00:04 at a speed (relative to the Earth) of 16.6 km/s