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Sep 20, 2021 · 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, 2013. The Chelyabinsk meteor created...
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 27, 2021 · A space rock possibly as wide as a football field flew between the moon and Earth last week, but the big asteroid -- catalogued as 2021 SG -- wasn't spotted until the day after it had already...
Geosynchronous satellites have an orbit with semi-major axis length of 0.000282 AU (42,200 km; 26,200 mi) or 0.110 lunar distances. 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.
Date Of Closest ApproachDiscovery [note 3]ObjectNominal Geocentric Distance [note ...((au))2021-01-01 [3]2021-01-02 G96 Mt. Lemmon Survey [4]2021 AA0.00159 AU (238,000 km; 148,000 mi)2021-01-03 [5]2021-01-03 703 Catalina Sky Survey [6]2021 AH0.00033 AU (49,000 km; 31,000 mi)2021-01-04 [7]2021-01-05 G96 Mt. Lemmon Survey [8]2021 AH80.00035 AU (52,000 km; 33,000 mi)2021-01-09 [9]2021-01-08 G96 Mt. Lemmon Survey [10]2021 AS20.00072 AU (108,000 km; 67,000 mi)Sep 23, 2021 · According to EarthSky, 2021 SG is four times larger than the one that disintegrated above Chelyabinsk, Russia, in 2013. That asteroid created a massive shockwave that broke windows in six cities across Russia as it crashed down to Earth.
- Bill Galluccio
Nov 29, 2021 · The Russia incident was a warning. On a winter morning in 2013, a meteor the size of a four-story building screamed across the country, exploding near the city of Chelyabinsk and injuring more ...
Mar 20, 2021 · The largest asteroid to sweep past Earth this year will make its closest approach on Sunday. But scientists have told people not to panic as it poses no threat to the planet.
