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Asteroid the size of the Golden Gate Bridge will whiz past Earth in March

3D illustration of an asteroid flying past Earth.
3D illustration of an asteroid flying past Earth. (Image credit: Aleksandra Sova via Shutterstock)

An asteroid as wide as the Golden Gate Bridge is long will hurtle past Earth next month. But although it will be the biggest and speediest asteroid to fly by our planet this year, there's no reason to panic.

The space rock, officially called 231937 (2001 FO32), is about 0.5 to 1 mile (0.8 to 1.7 kilometers) in diameter and will come within 1.25 million miles (2 million kilometers) of Earth at 11:03 a.m. EST (1603 GMT) on March 21 — close enough and large enough to be classified as "potentially hazardous," according to a database published by NASA's Jet Propulsion Laboratory. 

An asteroid is designated as "potentially hazardous" when its orbit intersects with Earth's at a distance of no more than about 4.65 million miles (7.5 million km) and it is bigger than about 500 feet (140 meters) in diameter, according to NASA's Center for Near-Earth Object Studies (CNEOS)

Related: The 7 strangest asteroids: Weird space rocks in our solar system 

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Small asteroids pass between Earth and the moon several times a month, and their fragments enter and break up in Earth's atmosphere almost daily, according to NASA's Planetary Defense Coordination Office (PDCO).

Telescopes in New Mexico that are part of the Lincoln Near-Earth Asteroid Research (LINEAR) program — an MIT Lincoln Laboratory program funded by the U.S. Air Force and NASA — detected the asteroid on March 23, 2001, according to EarthSky. Observatories have monitored it ever since. Scientists used these observations to calculate the asteroid's orbit and determine how close the space rock will come to Earth when it whizzes by at almost 77,000 mph (124,000 km/h). 

No known asteroid poses a significant risk to Earth for the next 100 years. The current biggest known threat is an asteroid called (410777) 2009 FD, which has a 1 in 714 (less than 0.2%) chance of hitting Earth in 2185, according to NASA's PDCO

NASA is studying methods of deflecting asteroids that do end up on a collision course with Earth, such as by using the gravity of a flying spacecraft to slowly pull asteroids off their trajectory to a safe distance, according to NASA's PDCO.

If you have a telescope with an aperture of at least 8 inches (20 centimeters), you might be able to spot the fast-moving space rock, according to EarthSky. To catch a glimpse in the southern U.S., point your telescope south-southeast between the constellations of Sagittarius and Corona Australis at 4:45 a.m. EST on March 20.

Originally published on Live Science.

Patrick Pester

Patrick is a staff writer for Live Science. His background is in wildlife conservation and he has worked with endangered species around the world. Patrick holds a master’s degree in international journalism and will be working toward a second master’s degree in biodiversity, evolution and conservation in action.