An asteroid (opens in new tab) the size of a jumbo jet will have a close encounter with Earth today (Sept. 1), zooming past our planet at about one-third the average distance to the moon.
Asteroid 2011 ES4 (opens in new tab) will make its closest approach today at 12:12 p.m. EDT (1612 GMT), according to NASA (opens in new tab). At that time, it will be about 75,400 miles (121,000 kilometers) from Earth. Because the object's orbit isn't well known, it could pass even closer than that, at a distance of just 45,400 miles (73,000 km), NASA added.
"Will asteroid 2011 ES4 hit Earth? No!," NASA's Asteroid Watch outreach arm wrote on Twitter (opens in new tab). "2011 ES4's close approach is 'close' on an astronomical scale but poses no danger of actually hitting Earth."
The asteroid measures somewhere between 72 feet to 161 feet in diameter (22 to 49 meters), or about the size of a commercial airliner. During its close approach, it will be traveling at a speed of 18,253 mph (29,376 kph).
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Asteroid 2011 ES4 was discovered by astronomers using the Mount Lemmon Survey at the University of Arizona on March 2, 2011, less than two weeks before the space rock's first known flyby of Earth.
But astronomers were only able to observe the asteroid for four days before it became too faint, and it has not been directly observed since, according to EarthSky.org (opens in new tab). This lack of observation data means that there is some uncertainty when it comes to calculating its exact trajectory.
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Will #asteroid 2011 ES4 hit Earth? 🌎 No! 2011 ES4’s close approach is “close” on an astronomical scale but poses no danger of actually hitting Earth. #PlanetaryDefense experts expect it to safely pass by at least 45,000 miles (792,000 football fields) away on Tuesday Sept. 1.August 28, 2020
Although this asteroid has been known to astronomers for almost a decade, plenty of asteroids that fly by Earth go undetected until the last minute — or remain unknown until after the flyby has happened. For example, two weeks ago the newfound asteroid 2020 QG made the closest near-miss (opens in new tab) on record, and it wasn't discovered until six hours later.
Email Hanneke Weitering at email@example.com or follow her on Twitter @hannekescience. Follow us on Twitter @Spacedotcom and on Facebook.