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Will asteroid 2024 YR4 hit the Moon?

June 29, 2025
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Will asteroid 2024 YR4 hit the Moon?
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Asteroid 2024 YR4 made headlines earlier this 12 months when its chance of impacting Earth in 2032 rose as excessive as 3%. Whereas an Earth influence has now been dominated out, the asteroid’s story continues.

The ultimate glimpse of the asteroid because it pale out of view of humankind’s strongest telescopes left it with a 4% probability of colliding with the Moon on 22 December 2032.

The probability of a lunar influence will now stay secure till the asteroid returns to view in mid-2028. On this FAQ, discover out why we’re left with this lingering uncertainty and the way ESA’s deliberate NEOMIR area telescope will assist us keep away from comparable conditions sooner or later.

What’s asteroid 2024 YR4?

Asteroid 2024 YR4 was discovered on 27 December 2024 at the Asteroid Terrestrial-impact Last Alert System (ATLAS) telescope in Río Hurtado, Chile.

Shortly after its discovery, automated asteroid warning systems determined that the object had a small chance of potentially impacting Earth on 22 December 2032.

The asteroid is between 53 and 67 metres in diameter. An asteroid of this size impacts Earth on average only once every few thousand years and would cause severe damage to a city or region.

These images of asteroid 2024 YR4 were captured by the NASA/ESA/CSA James Webb Space Telescope in March 2025

Follow-up observations saw the chance of impact rise to around 3%. As a result, the asteroid shot to the top of ESA’s asteroid risk list and captured world consideration because it grew to become the primary asteroid to set off a coordinated worldwide planetary defence response.

Further observations revamped the subsequent few months, together with these made utilizing the James Webb House Telescope, allowed astronomers to extra precisely measure the asteroid’s orbit across the Solar.

By March 2025, they’d sufficient info to rule out an Earth influence in 2032.

Why did we not detect 2024 YR4 sooner?

Asteroid 2024 YR4: from discovery to potential lunar influence

2024 YR4 was first found two days after it had already handed its closest level to Earth. It was not detected sooner as a result of it approached Earth from the day aspect of the planet, from a area of the sky hidden by the intense gentle of the Solar.

This area of the sky is hidden from the view of ground-based optical telescopes and is a blind spot for asteroid warning techniques.

The importance of this blind spot was made clear on 15 February 2013, when the Chelyabinsk meteor, a 20-metre, 13 000-tonne asteroid, struck the ambiance over the Ural Mountains in Russia throughout the center of the day. The ensuing blast broken hundreds of buildings, and roughly 1500 folks had been injured by shards of glass.

Vapour cloud path left by the Chelyabinsk asteroid on 15 February 2013

Might we’ve got detected 2024 YR4 sooner?

ESA’s Near-Earth Object Mission in the InfraRed (NEOMIR) satellite, planned for launch in the early 2030s, will cover this important blind spot.

NEOMIR will be equipped with an infrared telescope and positioned at the first Sun-Earth Lagrange Point. By relying on infrared light, rather than visible light, NEOMIR can spot asteroids in a region of the sky much closer to the Sun. It will repeatedly scan this region for the thermal signatures of asteroids approaching Earth that are at least 20 metres across – like 2024 YR4 and the Chelyabinsk meteor.

“We looked into how NEOMIR would have performed in this situation, and the simulations surprised even us,” says Richard Moissl, Head of ESA’s Planetary Defence Office.

“NEOMIR would have detected asteroid 2024 YR4 about a month earlier than ground-based telescopes did. This would have given astronomers more time to study the asteroid’s trajectory and allowed them to much sooner rule out any chance of Earth impact in 2032.”

“As an infrared telescope, like Webb, NEOMIR would have also immediately given us a much better estimate for the asteroid’s size, which is very important for assessing the significance of the hazard.”

ESA’s planned NEOMIR space telescope will search for asteroids approaching Earth while hidden by the glare of the Sun. In doing so, it will fill an important blind spot in modern asteroid warning systems.

Will asteroid 2024 YR4 impact the Moon?

By March 2025, astronomers had ruled out an Earth impact in 2032. However, the final observations of the asteroid failed to rule out another intriguing possibility: a lunar impact.

The probability that asteroid 2024 YR4 will strike the Moon on 22 December 2032 is now approximately 4%, and this probability was still slowly rising as the asteroid faded out of view.

However, this means that there is a 96% chance that the asteroid will not impact the Moon.

This image depicts the probability that the asteroid 2024 YR4 will impact Earth’s Moon on 22 December 2032, as calculated on 17 June 2025. The red dots represent the possible locations of asteroid 2024 YR4 on that day. The yellow dot represents its most likely location.

When will we know for sure?

We are left with an interesting situation: there is now a 60 m asteroid with a 4% chance of hitting the Moon in 2032. As the asteroid is now too far away to study any further, this probability will remain unchanged until it returns into view in June 2028.

When it does return into view, new observations will be made and it will not take long for astronomers to confidently determine whether the asteroid will, or much more likely, will not, hit the Moon on 22 December 2032. 

What will happen if the asteroid hits the Moon?

“A lunar impact remains unlikely, and no one knows what the exact effects would be,” says Richard Moissl.

The cratered surface of the Moon seen by ESA’s Juice spacecraft in August 2024

“It is a very rare event for an asteroid this large to impact the Moon – and it is rarer still that we know about it in advance. The impact would likely be visible from Earth, and so scientists will be very excited by the prospect of observing and analysing it. I am sure that detailed computational simulations will be done over the next few years.”

“It would certainly leave a new crater on the surface. However, we wouldn’t be able to accurately predict in advance how much material would be thrown into space, or whether any would reach Earth.”

In the coming years, as humankind looks to establish a prolonged presence at the Moon, monitoring space for objects that could strike Earth’s natural satellite will become increasingly important.

Small objects burn up in Earth’s atmosphere as meteors, but the Moon lacks this shield. Objects just tens of centimetres in size could pose a significant hazard to astronauts and lunar infrastructure.

What else is ESA doing to improve Europe’s planetary defence capabilities?

The discovery of asteroid 2024 YR4 made it clear that time is of the essence when it comes to asteroid detection. In cases like that of 2024 YR4, the later an asteroid is detected, the less time is available for follow-up observations before it fades from view.

Decision makers need as much information as possible when considering potential mitigation strategies, such as deflection missions or evacuation plans: they do not want to be left with an uncertain but significant chance of Earth impact for multiple years.

By keeping watch for asteroids approaching Earth from the direction of the Sun, ESA’s NEOMIR space telescope will fill an important blind spot in our current asteroid detection systems and significantly improve our preparedness for future hazards similar to 2024 YR4.

Follow the links below to find out more about ESA’s other Planetary Defence activities, such as the Near-Earth Object Coordination Centre (NEOCC); the Flyeye asteroid survey telescopes; the Hera mission, which will turn asteroid deflection into a well understood and repeatable technique for planetary defence; and the Ramses mission to intercept and explore the infamous asteroid Apophis as it safely passes close to Earth in 2029.

ESA’s Planetary Defence Office is part of the Agency’s Space Safety Programme. The Programme works to monitor and mitigate hazards in or from space, protecting our Pale Blue Dot, its inhabitants, and the vital infrastructure on Earth and in space on which we have come to depend.

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