A skyscraper-size, “potentially hazardous” asteroid is set to make a close approach to Earth this week — and you can see it zoom past for yourself, either by using a backyard telescope or via a free online livestream.
The asteroid, which was discovered earlier this year, was initially predicted to have a slim chance of hitting our planet in 2089 — temporarily earning it a spot at the top of the European Space Agency’s (ESA’s) impact risk list. But, following new observations, it is no longer considered an imminent threat.
2025 FA22 was initially discovered in March by the Pan-STARRS 2 telescope in Hawaii. The asteroid quickly made headlines when it was revealed that it has a 0.01% chance of hitting Earth when it returns for another close flyby on Sept. 23, 2089. (This story was somewhat overshadowed by fellow asteroid 2024 YR4, which was briefly predicted to have a much higher chance of impacting our planet in 2032 at around the same time 2025 FA22 was first spotted.)
Despite the low odds of a collision, space agencies took the threat of 2025 FA22 seriously, and the asteroid was briefly bumped to the top spot on ESA’s Risk List, which monitors all near-Earth objects predicted to have a non-zero chance of impacting our planet.
“However, high-priority follow-up observations soon allowed astronomers to refine the asteroid’s trajectory and rule out any impact risk,” according to a new ESA statement. Asteroid 2025 FA22 was removed from ESA’s Risk List entirely in May.
Related: NASA’s most wanted: The 5 most dangerous asteroids to Earth
The now totally safe flyby of 2025 FA22 will be shared on a free livestream by the Virtual Telescope Project, which will track the object using a telescope in Manciano, Italy. The livestream will begin at around 23:00 p.m. EDT on Wednesday (Sept. 17).
During its close approach, the asteroid could reach an apparent magnitude of 13, which will make it just bright enough to spot with a decent backyard telescope or a pair of stargazing binoculars, according to IFLScience. You can find where it is in the night sky using TheSkyLive.com.
Researchers will be keeping a close eye on the asteroid from observatories across the globe, including NASA’s Goldstone radar telescope in Barstow, California, which has the capability to reveal more about the space rock’s true size and shape.
The International Asteroid Warning Network (IAWN) is also taking 2025 FA22’s flyby as an opportunity to practise its emergency protocols by running a practice scenario under the pretence that the asteroid will still impact us in 2089. This mock test, named the 2025 FA22 IAWN Campaign, will involve measuring as many of the asteroids’ characteristics as accurately as possible, in preparation for a hypothetical mission to deflect the space rock in the future.
“While 2025 FA22 poses no danger, practicing our ability to measure these properties is important, as they influence how an asteroid will react to any attempt to deflect it off of a collision course with Earth,” ESA representatives wrote about the campaign.
In reality, 2025 FA22 will not get very close to us in 2089. The latest calculations from NASA’s Jet Propulsion Laboratory suggest that it will only come within 3.7 million miles (6 million km) of Earth, more than seven times further away than its current flyby.
However, the asteroid will return for a super close approach in 2173, when it will reach a minimum distance of around 200,000 miles (320,000 km), bringing it closer to us than the moon.
