One of the most closely watched space rocks in the solar system is set to make an extraordinarily close approach to Earth near the end of the decade. The asteroid known as Apophis will sweep past the planet at a distance smaller than the altitude of some communications satellites, offering scientists a rare chance to study a large asteroid up close without leaving the ground.
The April 13, 2029 close approach
On April 13, 2029, the asteroid 99942 Apophis is expected to pass roughly 20,000 miles above Earth’s surface. That places it inside the belt of geostationary satellites that ring the planet at about 22,000 miles, an almost unheard-of proximity for an object of its size.
During the flyby, Apophis should become visible to the naked eye from parts of the Eastern Hemisphere, appearing as a moving point of light. It is rare for an asteroid this large to come near enough to be seen without a telescope.
An estimated two billion people across Europe, Africa, and western Asia will be positioned to watch it drift across the sky. Rather than streaking like a meteor, the asteroid will crawl slowly among the stars over the course of hours, a subtle but unmistakable moving speck for anyone who knows where to look. Such a public, naked-eye pass by a sizable asteroid has no modern precedent.
How big Apophis actually is
Apophis measures roughly 340 meters across, about the length of three football fields. An object of that scale striking Earth would be regionally devastating, which is part of why the asteroid drew intense attention after its discovery in 2004.
Early observations briefly suggested a small chance of impact in 2029, and later in 2036 and 2068. Refined tracking has since ruled those out, and details of the object are maintained by NASA’s asteroid science pages.
Why 2029 poses no danger
Despite the dramatic closeness, the 2029 encounter carries no risk of collision. Precise radar and optical measurements have mapped the asteroid’s orbit tightly enough for astronomers to state with confidence that it will miss the planet.
The gravitational tug Earth exerts during the pass will, however, alter Apophis’s orbit slightly and even change how it tumbles through space. Observing exactly how the flyby reshapes its path gives researchers a natural experiment in how planetary gravity acts on small bodies.
The encounter may even reshape the asteroid physically. If Apophis is a loosely bound rubble pile rather than a solid rock, Earth’s gravity could trigger small landslides, quakes, or shifts on its surface. Watching for such changes would offer a rare glimpse into the internal structure and cohesion of a near-Earth asteroid, information that is otherwise almost impossible to obtain without landing on one.
A once-in-a-generation research opportunity
Because such a close pass by a sizable asteroid happens only rarely, mission planners and observatories are preparing to study Apophis intensively in 2029. Radar imaging can reveal its shape, spin, and surface, while spacecraft could examine how the near-Earth encounter affects its structure.
Data gathered during the event will sharpen models of how asteroids are built, from solid rock to loose rubble piles held together by weak gravity. That knowledge feeds directly into planetary defense, the effort to understand and, if necessary, deflect hazardous objects.
Several space agencies are weighing missions to observe Apophis before, during, and after the flyby, with some concepts aiming to rendezvous with the asteroid and study it up close. A spacecraft already in deep space is also being redirected to encounter Apophis after the pass. These efforts would transform a fleeting sky show into a sustained scientific campaign around a single, well-timed target.
What planetary defense learns from Apophis
Studying a well-characterized asteroid as it swings past Earth helps validate the tracking and modeling tools that underpin planetary defense worldwide. The more accurately scientists can predict and describe an object like Apophis, the better prepared they are for any genuinely threatening asteroid found later.
Programs that catalog near-Earth objects, coordinated in part through the European Space Agency’s space safety work, treat close approaches like this as full-scale rehearsals. Apophis, once feared as a possible impactor, has become instead a valuable teacher.
How Apophis got its ominous name
The asteroid was named after a figure from Egyptian mythology associated with darkness and destruction, a nod to the alarm that surrounded its discovery in 2004. At the time, initial calculations gave it a small but non-trivial chance of striking Earth in 2029, briefly making it one of the most threatening objects ever catalogued.
Additional radar observations soon shrank that risk to zero for the foreseeable future, and later analysis extended the all-clear across the next century. The story illustrates how planetary defense actually works: an object is flagged, tracked intensively, and its orbit refined until uncertainty collapses. Apophis moved from feared impactor to prized research target precisely because the system did its job.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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