Tiny Asteroid Detected Just Hours Before Impacting Earth’s Atmosphere

By: Sam Watanuki | Published: Sep 05, 2024

In a rare astronomical event, a small asteroid known as 2024 RW1 was discovered just hours before it was set to hit Earth’s atmosphere. The European Space Agency (ESA) confirmed the discovery on September 4, 2024.

Despite its size, the asteroid’s detection is a remarkable achievement in planetary defense, showcasing the advancements in space rock tracking.

A Quick Discovery by the Catalina Sky Survey

The Catalina Sky Survey (CSS), a NASA-funded project, spotted the asteroid in the early hours of September 4. Measuring just about 1 meter (3 feet) in diameter, 2024 RW1 was quickly identified as harmless.

Advertisement
Catalina Sky Survey in winter

Source: Daniel Oberhaus

Small asteroids like this one are typically expected to burn up as they enter Earth’s atmosphere, creating a potential fireball display.

Asteroids Like 2024 RW1 Hit Earth Every Two Weeks

Asteroids around the size of 2024 RW1, roughly 1 meter, are estimated to impact Earth about every two weeks. However, they are rarely detected before making contact with the atmosphere.

Advertisement
A photograph of a large asteroid in space

Source: Freepik

The detection of 2024 RW1 marks only the ninth time humans have officially spotted an asteroid before impact.

What Happens When Asteroids Enter Earth’s Atmosphere

Asteroids like 2024 RW1, when entering Earth’s atmosphere, usually burn up, creating a spectacular fireball visible from the ground. These space rocks aren’t large enough to pose a threat to life on Earth, but they can create stunning visual displays.

Advertisement
A photograph of Earth from space

Source: Wikimedia

Observers in the Philippines were hoping for just such a show as 2024 RW1 entered the atmosphere near Luzon Island.

Cloudy Skies Threaten the Fireball Show

While many anticipated seeing a bright fireball in the sky, weather conditions posed a challenge. Typhoon Yagi, a powerful storm in the region, caused heavy cloud cover that made viewing the asteroid’s fiery descent difficult.

Advertisement
Tanker under dark looming grey storm clouds in The Bay of Biscay north of Santander in the Atlantic Ocean, Spain.

Source: Tim Graham/Getty Images

The storm, which had recently passed over the northern Philippines, was sitting about 250 miles west of Luzon, impacting visibility.

How 2024 RW1 Compares to Other Asteroids

Asteroids like 2024 RW1 are tiny compared to the ones that pose a potential threat to Earth. While 2024 RW1 was only a few feet in diameter, NASA and ESA regularly track thousands of near-Earth objects that could be hazardous in the future.

Advertisement
A photograph of an asteroid in space

Source: Wikimedia

Thankfully, no significant impact threats are anticipated for the next hundred years, according to NASA’s Asteroid Watch.

Advertisement

Why Asteroid Detection is Crucial

The discovery of 2024 RW1 highlights the importance of planetary defense programs. Finding and tracking asteroids helps scientists understand potential risks and prepare for impacts.

Advertisement
Soldier in a special operation monitoring room

Source: Freepik

CSS, the team behind the detection, plays a big role in planetary defense by scanning the skies for any incoming space rocks and rapidly calculating their trajectories.

Advertisement

Catalina Sky Survey: A Brief History

The Catalina Sky Survey, based out of the University of Arizona, has been at the forefront of asteroid detection for years.

Advertisement
A photograph of a large cluster of stars deep in space

Source: Wikimedia

Using state-of-the-art telescopes and advanced software, the team regularly finds small asteroids hours before they hit Earth. Their work ensures we’re better prepared for future impacts, no matter how small or large the space rocks are.

Advertisement

Asteroids and Their Fiery Demise

While larger asteroids can cause damage, these smaller ones are often harmless, burning up completely before they reach the surface.

Advertisement
Digital illustration of asteroid hitting planet Earth

Source: Freepik

Fortunately, for skywatchers, their fiery demise makes for an impressive show for skywatchers.

Advertisement

2024 RW1 and the Power of Social Media

As news of the asteroid spread, people took to social media to discuss the impending impact. The ESA fielded several questions about the object, reassuring the public that 2024 RW1 posed no threat.

Advertisement
A woman with silver jewelry holding her phone

Source: Priscilla Du Preez/Unsplash

In fact, the ESA called the detection “a sign of our improving planetary defense capabilities,” highlighting the progress made in tracking small asteroids.

Advertisement

No Danger, Just a Spectacle

Despite the brief excitement surrounding 2024 RW1, there was never any real threat to Earth. The asteroid was small enough to burn up upon atmospheric entry, with any debris likely falling into the ocean.

Advertisement
A photograph of several people watching the stars

Source: Wikimedia

NASA and ESA have made significant strides in tracking these objects, ensuring that even small space rocks are monitored closely for public safety.

Advertisement

The Future of Planetary Defense

Asteroids like 2024 RW1 offer valuable insights into the effectiveness of planetary defense systems.

Advertisement
A photograph of several people working in an office at NASA

Source: Wikimedia

By discovering and tracking space rocks before they impact Earth, agencies like NASA and ESA are improving their ability to protect the planet.

Advertisement