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'Potentially hazardous' asteroid twice the size of the Empire State Building will skim past Earth Thursday, NASA says

This artistic concept image shows an asteroid flying by Earth.
(Image credit: Shutterstock)

A gigantic "potentially hazardous" asteroid that may be twice the size of the Empire State Building is set to zoom past Earth Thursday (April 28), according to NASA (opens in new tab).

The asteroid, named 418135 (2008 AG33), has an estimated diameter between 1,150 and 2,560 feet (350 to 780 meters) and will break into Earth's orbit at a blistering 23,300 mph (37,400 km/h). Thankfully, the asteroid is expected to skim past our planet  without any risk of impact.

At its closest point, the asteroid — traveling at more than 30 times the speed of sound — will come within about 2 million miles (3.2 million kilometers) of Earth, which is roughly eight times the average distance between Earth and the moon. This may sound like a big gap, but by cosmic standards, it's actually a stone's throw away.

Related: We may finally know why spinning-top asteroid Ryugu has such a weird shape

NASA flags any space object that comes within 120 million miles (193 million km) of Earth as a "near-Earth object" and any fast-moving object within 4.65 million miles (7.5 million km) as "potentially hazardous." Once the objects are flagged, astronomers closely monitor them, looking for any deviation from their predicted trajectory that could put them on a collision course with Earth.  

The incoming space rock was first discovered on Jan. 12, 2008, by asteroid surveyors at the Mt. Lemmon SkyCenter observatory in Arizona and last zipped past Earth on March 1, 2015, according to NASA's Center for Near Earth Object Studies (CNEOS). The asteroid swings by our planet roughly every seven years, with the next close flyby predicted to come on May 25, 2029.

Thursday's asteroid might not even be the biggest space rock to hurtle past us in the coming weeks. That title will likely go to 467460 (2006 JF42), which has an estimated diameter between 1,247 and 2,822 feet (380 to 860 m) and will be traveling at roughly 25,300 mph (40,700 km/h) when it passes us on May 9, 2022.

If astronomers ever do spy an asteroid flying straight at Earth, space agencies around the world are already working on ways to possibly deflect the object. On Nov. 24, 2021, NASA launched a spacecraft as a part of its Double Asteroid Redirection Test mission, which plans to redirect a nonhazardous asteroid by ramming it off course, Live Science previously reported. China is also in the early planning stages of an asteroid-redirect mission. By slamming 23 Long March 5 rockets into the asteroid Bennu, the country says it would be able to divert the space rock from a potentially catastrophic impact with Earth, Live Science previously reported.

Originally published on Live Science.

Ben Turner
Ben Turner

Ben Turner is a U.K. based staff writer at Live Science. He covers physics and astronomy, among other topics like tech and climate change. He graduated from University College London with a degree in particle physics before training as a journalist. When he's not writing, Ben enjoys reading literature, playing the guitar and embarrassing himself with chess.