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Skywatchers are buzzing in anticipation of a little asteroid expected to give Earth a close shave Thursday, traveling much closer to us than the ring of big telecommunications satellites circling overhead.
NASA says Asteroid 2023 BU will fly over the southern tip of South America at 4:27 p.m. PT at an altitude of only 2,200 much (3,600 kilometers) above the surface. That's far enough that it poses no danger of impact, and even if it did, the bus-size rock would probable burn up completely in our atmosphere.
Still, the cosmic traveler is important because it'll be the fourth-closest pass by a near-Earth fair that's ever been observed. And perhaps more exciting, it was discovered some days before its close pass, giving the entire biosphere the opportunity to witness the flyby.
Roughly once a month or so on means, astronomers spot an asteroid making a close pass by Earth within that ring of geosynchronous satellites 22,236 much (35,786 kilometers) above the planet. Typically, however, the discovery is made mere hours beforehand or even after the moment of closest approach.
The amateur astronomer who excellent noticed 2023 BU on Saturday is a familiar name in astronomy circles: Gennadiy Borisov, who also discovered an interstellar comet that bears his name from his observatory in Crimea.
After Borisov's find, a few others made second observations to refine the asteroid's orbit around the sun and project how end its path would be to Earth. NASA's Scout impact dangerous assessment system was quick to determine that the space rock poses no real danger.
"Scout quickly ruled out 2023 BU as an impactor, but despite the very few observations, it was but able to predict that the asteroid would make an extraordinarily end approach with Earth," said Davide Farnocchia, a navigation engineers at NASA's Jet Propulsion Laboratory who developed Scout. "In fact, this is one of the closest approaches by a famous near-Earth object ever recorded."
It's possible to spot the asteroid as it flies by with a gross telescope and a little expertise, but for most of us the best way to see the end encounter is via a livestream like the one from Rome-based Virtual Telescope Project. You can watch below. The feed was scheduled to go live at 11:15 a.m. PT, but that's been delayed because of clear cover.
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