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Asteroid 99942 Apophis will pass about 32,000 kilometers (20,000 miles) above Earth’s surface on April 13, 2029. It is not expected to hit us: NASA says current observations rule out an impact for at least 100 years. The significance is scientific. Earth’s gravity will perturb a large asteroid, giving researchers a rare chance to measure how its orbit, rotation and surface respond—and to test models that help assess future asteroid hazards.
What Apophis is—and why it once raised concern
Apophis is a near-Earth asteroid officially designated 99942 Apophis. Roy Tucker, David Tholen and Fabrizio Bernardi discovered it at Kitt Peak National Observatory on June 19, 2004. Its mean diameter is about 340 meters (1,115 feet), and its longest axis is at least roughly 450 meters. It is an S-type asteroid, composed broadly of silicate material and nickel-iron rather than the carbon-rich material associated with C-type asteroids such as Bennu. NASA’s Apophis facts and overview explain its size and orbit.
Its size and Earth-crossing orbit place it in the potentially hazardous asteroid category. That label describes an object’s size and orbital geometry; it does not mean an impact is predicted. When Apophis was first found, limited observations left enough uncertainty that early calculations included possible impact scenarios in 2029, 2036 or 2068. Additional optical observations and radar measurements constrained its orbit and removed those scenarios. NASA now says an impact is ruled out for at least a century; its risk assessment and JPL’s orbit and radar analysis document that change.
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How close the 2029 flyby will be
At closest approach on April 13, 2029, Apophis is expected to pass approximately 32,000 kilometers (20,000 miles) above Earth’s surface. That is below the roughly 36,000-kilometer (22,236-mile) altitude of geosynchronous satellites. The reference point matters: this figure is altitude above the surface, not distance from Earth’s center. The pass is also roughly one-tenth of the average Earth–Moon distance, a comparison that conveys its closeness but should not be mistaken for a precise measure of the encounter geometry.
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NASA describes this as the closest known-in-advance approach by an asteroid of Apophis’s size. It is an exceptionally rare opportunity to observe a large asteroid at close range with modern spacecraft, radar, telescopes and coordinated monitoring networks—not an impending collision.
Earth’s gravity makes the flyby a natural experiment
Earth will change Apophis even as the asteroid passes safely. The encounter will deflect its solar orbit and alter its orbital period. Tidal forces may also affect its spin, rotation rate and surface. Researchers will look for signs of movement such as landslides, shifting regolith or newly exposed material; these are possibilities to investigate, not guaranteed dramatic events.
The scientific logic is a before-and-after comparison: measure Apophis’s orbit, spin, shape and surface properties before the encounter, observe it as close to the encounter as possible, then compare those measurements with observations afterward. A measurable response would help scientists understand how a large, stony asteroid behaves under strong gravitational forces. Even if surface changes are subtle, comparing observations with predictions can improve models of orbital evolution, tidal response and rotation.
Ramses is planned to watch the encounter up close
ESA’s Rapid Apophis Mission for Space Safety, or Ramses, is being developed with JAXA participation to rendezvous with Apophis before the flyby and accompany it through the encounter. ESA’s plan calls for launch in spring 2028, commonly specified as April, and arrival in February 2029, about two months before closest approach. That timing is intended to give the spacecraft a nearby view before, during and after Earth’s gravitational perturbation. The mission’s current overview describes its planned observations of the asteroid’s shape, rotation, surface behavior and orbit.
Ramses is a planned mission, and its schedule is demanding. ESA reported full commitment at its November 2025 Ministerial Council Meeting. On February 10, 2026, it announced an €81.2 million contract with OHB Italia for spacecraft development, bringing the total Ramses contract value to approximately €150 million. On June 25, 2026, ESA reported that the spacecraft’s central structural tube was complete and assembly was underway. Those milestones do not guarantee the launch date: the mission must still meet the 2028 launch window needed for its planned arrival. See ESA’s contract announcement and construction update.
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OSIRIS-APEX will study Apophis after the flyby
NASA’s OSIRIS-APEX is the extended mission of OSIRIS-REx, which returned a sample from asteroid Bennu to Earth in September 2023. The spacecraft then continued toward Apophis. NASA’s current mission page lists a June 2029 rendezvous; earlier NASA material described arrival later in April, so the current page reflects a schedule that has evolved.
Once at Apophis, OSIRIS-APEX is planned to image and map the asteroid, measure its physical and spectral properties, and investigate changes associated with the Earth encounter. The mission also plans to use its thrusters near the surface to disturb rocks and dust, potentially exposing subsurface material. NASA describes approximately 18 months of planned operations, subject to spacecraft health and mission conditions. Unlike Ramses, OSIRIS-APEX is scheduled to arrive after the flyby, making its role principally the detailed investigation of the aftermath.
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There are also programmatic uncertainties. A 2025 NASA Office of Inspector General report identified possible operational descoping and insufficient funding for fiscal years 2026–2028, warning that proposed FY2026 budget reductions could affect science objectives. NASA’s public mission page continues to list OSIRIS-APEX as active with a June 2029 rendezvous. These facts describe a mission still planned but facing documented constraints; neither a listed schedule nor a funding warning alone establishes what observations will ultimately be completed. The report is available from NASA’s Office of Inspector General.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Earth-based observations complete the picture
Optical telescopes can track Apophis and measure changes in brightness and apparent motion. Radar, when the asteroid’s position and observing geometry permit, can sharpen measurements of its orbit, shape, rotation and surface properties. NASA’s Apophis observing effort includes coordination through the International Asteroid Warning Network (IAWN), bringing together observations from telescopes, radar facilities and other participants. NASA’s Apophis exploration page describes that coordination.
Apophis is expected to be visible without optical aid from parts of the Eastern Hemisphere, but that is not a promise of a view everywhere. Visibility depends on location, timing, sky conditions, brightness and the asteroid’s position in the sky. Ground-based optical observations immediately after closest approach may also be hampered because Apophis will appear too close to the Sun. That observing geometry makes spacecraft data particularly valuable for detecting changes near the encounter itself.
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What the encounter can teach planetary defense
Planetary defense is a chain of work, not a single intervention: discover objects, track them, refine their orbits, characterize their physical properties, model their behavior, choose an intervention if one is needed, and monitor the result. Apophis is especially useful for improving orbit determination, physical characterization and models of how asteroids respond to gravity.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errors- Orbit prediction: Comparing precise measurements before and after the encounter can test calculations of how a close planetary passage changes an asteroid’s trajectory and future orbit.
- Physical response: Observations of spin, shape and surface changes can help constrain models of tidal stress and asteroid structure.
- Reconnaissance: Ramses and OSIRIS-APEX illustrate complementary observations around a close encounter: one is planned to be present beforehand, the other to investigate afterward.
- Coordination: Comparing spacecraft, radar and optical observations can improve methods for combining measurements from different instruments and observing windows.
These results would not by themselves determine how to divert a future threatening asteroid. They can improve the information and models needed before a decision is made. ESA’s discussion of rapid asteroid reconnaissance emphasizes why close-up characterization matters when planning a response.
Apophis is not a deflection test
NASA’s DART mission demonstrated that a spacecraft impact can alter an asteroid’s orbit. Apophis is a different kind of opportunity: no impactor mission is planned, and the asteroid is not being steered away from Earth. Its role is observation and characterization, including the chance to measure a natural gravitational perturbation. That knowledge can inform future planetary-defense decisions, but the 2029 encounter is not an active defense operation.
What remains uncertain
- Ramses must meet a schedule-sensitive 2028 launch window; its planned observations depend on successful development and operations.
- OSIRIS-APEX’s science return may be affected by the programmatic and funding concerns identified by NASA’s inspector general.
- Some physical changes may be subtle or difficult to separate from variations in lighting and viewing geometry.
- Ground observations depend on weather, daylight, sky position, brightness and available observing geometry.
- Planetary-defense conclusions will come from comparing datasets and accounting for uncertainty, not from a single image or observation.
Calling Apophis’s flyby a planetary-defense milestone is a reasonable assessment of its rare combination of a large, known asteroid, a close but safe passage, coordinated spacecraft and a measurable natural perturbation. It is not an official designation—and it does not mean Earth needs protection from Apophis in 2029.
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