99942 Apophis: Earth’s Upcoming Close Encounter
The asteroid 99942 Apophis is set to pass approximately 32,000 kilometers from Earth in April 2029, according to NASA. This distance is roughly one-tenth of the gap between the Moon and our planet. While scientists confirm the asteroid will not collide with Earth, the event provides a rare opportunity to study a near-Earth object as it navigates through a region crowded with human-made satellites.
NASA and ESA Coordinate Dual Missions
Space agencies are preparing to monitor the 450-by-170-meter asteroid using dedicated missions. NASA is repurposing its OSIRIS-APEX mission—the successor to the OSIRIS-REx project—to intercept Apophis shortly after its closest approach. According to NASA, the probe is scheduled to arrive at the asteroid in June 2029.
The European Space Agency (ESA) is developing the RAMSES mission to reach the asteroid earlier. Plans indicate the RAMSES probe will launch in April 2028 and monitor the asteroid starting in February 2029, two months before the closest Earth approach.
Did you know?
Apophis was first discovered in 2004, though weather and technical issues limited initial observations to just two days. Scientists have since refined its trajectory, confirming it poses no collision threat to Earth in 2029.
The Risk of Space Debris Interference
A study published in The Planetary Science Journal, authored by physicists Alessandro Rossi and Giulia Schettino, highlights a unique challenge: the potential for Apophis to encounter existing space debris. Because the asteroid will pass through the geostationary orbit region, it may come within kilometers of thousands of defunct satellites and fragments.
While researchers conclude that a collision with small pieces of space junk would not alter the asteroid’s trajectory or threaten Earth, it could complicate scientific observations. Rossi explains that a minor impact could create a new crater or a cloud of debris, making it difficult for missions like RAMSES and OSIRIS-APEX to distinguish between geological changes caused by Earth’s gravity and those resulting from a man-made collision.
Frequently Asked Questions
Will the Apophis asteroid hit Earth in 2029?
No. Astronomers have calculated the trajectory multiple times and confirmed that the asteroid will safely miss our planet.
How close will the asteroid get?
Apophis will pass approximately 32,000 kilometers from Earth, which is closer than many satellites in geostationary orbit.
Why are we sending probes to an asteroid that isn’t hitting us?
The flyby offers a unique chance to study the internal structure of an asteroid. Scientists want to observe how Earth’s gravitational pull affects the asteroid’s surface, including potential landslides or seismic activity.
Stay updated on the latest developments regarding the 2029 flyby by subscribing to our space science newsletter or checking for updates from the NASA Near-Earth Object Coordination Center.
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