One of planetary defense‘s biggest opportunities will come as the asteroid Apophis makes its tight flyby of our planet on April 13, 2029, allowing international space missions to interact with the near-Earth object. Asteroids this size only approach this close to Earth about once every 7,500 years, making the event a rare opportunity for real-world planetary defense research.

In a new paper published in the journal Space: Science & Technology, a team of researchers analyzes the many opportunities the Apophis flyby will offer for science and planetary defense.

The closest distance between Earth and Apophis during the flyby will be a mere 38,000 kilometers, about one-tenth of the distance from the Earth to the Moon. Coordinating these planetary defense efforts among the Earth’s nations may be one of the biggest challenges as the object comes uncomfortably close.

Apophis Explained

As soon as astronomers first discovered Apophis in 2004, the asteroid’s 340-meter-wide diameter and close pass by Earth immediately made it a concern for scientists. Fortunately, it is expected that on April 13, 2029, it will safely pass our planet at a distance of close to 20,000 miles—closer than some of our weather and communication satellites, but still with no risk of an impact.

Yet the near-Earth asteroid still holds mysteries for scientists. Models of the object depend heavily on assumptions, not hard data, to predict not just its tidal effects but also its composition, size, internal structure, and spin state.

With so many open questions about the asteroid and the unique opportunity to collect data and test processes for future planetary defense operations, many countries are planning missions to Apophis, but in this new paper, the researchers note that some of these activities require increased international coordination to avoid interference.

Part of the paper synthesizes known data on Apophis, including radar observations, light-curve, and spectral data. From this data, the team then developed new predictions for the asteroid’s dust ejection, orbital and spin changes, internal structural response, and surface material displacement. These projections were crucial in the researchers’ evaluations of the feasibility of various currently proposed or authorized missions and their likely scientific value.

Apophis Missions are Gearing Up

Future Apophis missions fit into four primary categories: rendezvous, flyby sample return, and impactor experiments.

In the recent research, the team found that flyby missions should capture data at very fine scales, down to the centimeter or decimeter for surface changes and hours for changes in spin period. Additionally, these space-borne instruments should be able to measure dust ejection phenomena. Together, this data stream alone could provide important direct evidence for how such rubble-pile asteroids evolve structurally. Relatively low-cost sample return missions could push this even further.

The activities coordinated under the International Asteroid Warning Network constitute the largest multinational asteroid detection and observation effort ever assembled and are its first global joint exercise. The network will build experience responding to potentially deadly space threats in the future.

Earth Interactions

On the other hand, the asteroid’s close approach to Earth will affect Apophis as well. Our planet’s gravity is expected to alter Apophis’s orbit from an Aten-type to an Apollo-type, changing the object’s spin period and orbital uncertainty. 

Additionally, roughly 1% of Apophis may experience a surface material disruption, potentially altering the object’s spectral properties by exposing fresh material.

The asteroid’s extremely low gravity may also cause it to lose surface dust to Earth’s magnetosphere, posing an electromagnetic disturbance hazard to spacecraft. Space agencies will need to monitor the situation to protect our increasingly essential space-based communications infrastructure during the event.

While there is no immediate danger to our planet, the researchers say this event is shaping up to be a pivotal moment in international space cooperation and a turning point for organized space defense.

The paper, “The Apophis Encounter in 2029: A Rare Opportunity for Planetary Science and Defense,” appeared in Space: Science & Technology on August 22, 2026.

Ryan Whalen covers science and technology for The Debrief. He holds an MA in History and a Master of Library and Information Science with a certificate in Data Science. He can be contacted at ryan@thedebrief.org.

July 20 marked the 50th anniversary of one of the biggest robotic spaceflight achievements in NASA’s history: the landing of the Viking 1 spacecraft on Mars. It was the first […]

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The Chinese Tianwen-2 mission has captured the first imagery of a space object that some astronomers are calling Earth’s “quasi-moon.”

The object was captured in images released by the China National Space Administration (CNSA), after its Tianwen-2 spacecraft reached the tiny asteroid 469219 Kamoʻoalewa. Initially discovered in 2016, the asteroid became the target of a sample return mission launched by China on 28 May 2025.

Officially the CNSA’s second mission under its Planetary Exploration of China Program, Tianwen-2 aims to return close to 100 grams of samples from the surface of the small object.

Earth’s Mysterious Quasi-Moons

Quasi-moons are the name astronomers have for small, very distant objects that do not impact our planet’s tides or possess other characteristics associated with our primary moon.

These objects are nonetheless considered moon-like because they remain in our celestial neighborhood for extended periods, providing unique opportunities for studying near-Earth objects (NEOs) like asteroids, and the impact things like solar radiation and gravity have on them.

Although Kamoʻoalewa (also known as asteroid 2016 HO3) is the most well-known of Earth’s quasi-moons, it is one of seven that are currently known to astronomers. Kamoʻoalewa’s orbit is technically also around the Sun, rather than Earth, although its synchronized path keeps it locked closely to Earth’s orbit, thereby justifying its recognition as a “quasi-satellite.”

The object’s size and distance make it an ideal target for studying NEOs, and China leaped at the opportunity with the CNSA’s Tianwen-2 mission.

Approaching a Quasi-Moon

The Tianwen-2 spacecraft is currently nearing 20 kilometers from the 130 to 330-foot space rock, according to a statement CNSA released on Monday.

Along with a mission update, the CNSA also released new images, which are the first to officially document the object’s appearance. According to current mission timelines, Tianwen-2 will remain in the vicinity of 469219 Kamoʻoalewa until next April, and by sometime in November 2027, its return capsule is expected to reach Earth.

After its study of 469219 Kamoʻoalewa, Tianwen-2 will then make its way with the aid of a gravity assist in the direction of the comet 311P/PANSTARRS, arriving in its vicinity by January 2035.

“Going forward, the probe will gradually conduct more detailed scientific explorations to obtain information on the asteroid’s shape, material composition, and internal structure,” read the CNSA’s statement on Monday.

The agency said its ongoing collection of information will help to provide “support for preparations for sampling,” and the spacecraft will spend the next several months conducting reconnaissance of the asteroid before its sample collection begins, which will combine high-speed maneuvers with the deployment of a specialized robotic arm.

Following their collection, the samples will be delivered to a recovery site in the Gobi Desert after dropping into Earth’s atmosphere in November 2027.

Micah Hanks is the Editor-in-Chief and Co-Founder of The Debrief. A longtime reporter on science, defense, and technology with a focus on space and astronomy, he can be reached at micah@thedebrief.org. Follow him on X @MicahHanks, and at micahhanks.com.

China’s Tianwen-2 spacecraft has carried out a series of small propulsive maneuvers following a main burn June 7, setting up an asteroid rendezvous in July.

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