While the space at these altitudes is generally empty, McDowell in his assessment suggested that the nearest functioning satellite to the asteroid's path was a US military GPS one that was about 2000 km away from the asteroid.
Asteroid 2021 GW4 passes within the GEO belt from 1146 UTC to 1416 UTC Apr 12. Perigee is 19833 km. Fortunately space is still rather empty at these altitudes - my estimate is that the closest approach to a tracked object is 1009 km to debris object S26918 pic.twitter.com/FJReTeK0ll— Jonathan McDowell (@planet4589) April 12, 2021
According to NASA, the diameter of the Asteroid 2021 GW4 was between 11 and25 foot and it was too small to survive. These small asteroids are more likely to entirely burn up when they come in contact with the Earth's atmosphere during their fall. While usually such small asteroids are spotted just hours before they come to their closest pass, 2021 GW4 was spotted on April 8 by the Mt. Lemmon Survey in Arizona.
Earlier in March, Asteroid 2001 FO32 which was reported to be the biggest asteroid of the year passed the Earth at a blazing speed of 123, 876 km per hour at its close point of approach to Earth. The speed of 2001 FO32 was more than any average asteroid and its diameter was reported to be somewhere between 0.8 km and 1.7 km.
The unusual speed of this asteroid created doubt and to reassure people, the NASA Asteroid Watch Twitter account delivered a message saying 2001 FO32 would "safely zip past Earth at a distance of 1.3 million miles — five times further away than the moon — and poses no risk of hitting Earth."
You may have seen headlines about an #asteroid that will safely fly by Earth on March 21. While this asteroid, known as 2001 FO32, is large, it will safely zip past Earth at a distance of 1.3 million miles—five times further away than the Moon—and poses no risk of hitting Earth. pic.twitter.com/oZZG5UaFsf— NASA Asteroid Watch (@AsteroidWatch) March 8, 2021
The asteroid safely passed on March 21, 2021.