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Sep 20, 2021 · Asteroid 2021 SG: Bigger than Chelyabinsk. New-found asteroid 2021 SG is some four times larger than the 17-meter (18-yard) space rock that disintegrated over Chelyabinsk, Russia, on February 15...
Sep 27, 2021 · 2021 SG passed us safely on Sept. 16, but at a relatively close distance -- astronomically speaking -- of around 153,000 miles (246,000 km). If it had entered Earth's atmosphere, it likely...
2021 SG is a near-Earth asteroid, with an estimated diameter of 42 to 94 meters, that passed about half a lunar distance from Earth on 16 September 2021. It approached from the direction of the Sun, so it was invisible until a day later. [6]
Sep 23, 2021 · A massive asteroid came dangerously close to Earth, and astronomers didn't see it until a day after it passed by the planet. The asteroid, named 2021 SG, came from the sun's direction and passed by Earth at around half the distance between the Earth and the Moon on September 16.
- Bill Galluccio
Jan 10, 2022 · These images and animation represent NASA radar observations of 4660 Nereus on December 10, 2021, before the asteroid's close approach on December 11, when it came within 2.5 million miles (4 million kilometers) of Earth.
The largest asteroid to pass within 1 LD of Earth in 2021 was 2021 SG with an estimated diameter of around 68 meters and an absolute magnitude of 24.0. The fastest asteroid to pass within 1 LD of Earth in 2021 was 2021 UA7 that passed Earth with a velocity with respect to Earth of 27.7 km/s (62,000 mph). [2][note 2]
2021 PH 27 is a near-Earth asteroid of the Atira group. It was discovered by Scott Sheppard using the Dark Energy Survey's DECam imager at NOIRLab's Cerro Tololo Inter-American Observatory on 13 August 2021.
