A 500-Meter-Long Asteroid Flew Past Earth, and Astronomers Were Watching By Nancy_A
Using radar, astronomers can measure the distances, sizes, and spin rates of asteroids.
The observations, made on January 29 to February 4, 2023 revealed the surface of 2011 AG5 has subtle dark and lighter regions that may indicate small-scale surface features a few dozen meters across. If seen by the human eye, it would resemble charcoal. It’s rotating slowly, taking about 9 hours to make a complete spin.
“Interestingly, shortly after its discovery, 2011 AG5 became a poster-child asteroid when our analysis showed it had a small chance of a future impact,” said Paul Chodas, the director for CNEOS at JPL. . “Continued observations of this object ruled out any chance of impact, and these new ranging measurements by the planetary radar team will further refine exactly where it will be far into the future.”
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