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An airplane-size asteroid gives Earth a close shave today

 An asteroid 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 will make its closest approach today at 12:12 p.m. EDT (1612 GMT), according to NASA. 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. "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).

Video: Airplane-size asteroid to fly close to Earth - Orbit animation
Related: Potentially dangerous asteroids (images)



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. This lack of observation data means that there is some uncertainty when it comes to calculating its exact trajectory. 

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 on record, and it wasn't discovered until six hours later.  https://twitter.com/AsteroidWatch/status/1299376208283566080?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1299376208283566080%7Ctwgr%5E&ref_url=https%3A%2F%2Fwww.space.com%2Fasteroid-2011-es4-close-earth-flyby-2020.html

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