Asteroid (99942) Apophis — 2026 NASA-Verified Scientific Status News Report
NASA JPL SBDB Solution Date: 2024‑Jun‑25 10:48:08 | Epoch 2461000.5 (2025‑Nov‑21.0)
Researched, Written and Published by: Astrophyzix Digital Observatory
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Classification: Near-Earth Object (Potentially Hazardous Asteroid) Evidence-First Report
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Apophis 2029 Flyby Key Takeaways
- No impact risk: NASA’s current orbital solutions for Apophis show zero impact probability for at least the next 100 years.[1]
- The 2029 flyby: Using official NASA data, Astrophyzix can confirm that on Friday 13 April 2029, Apophis will pass at about 32,000 km above Earth’s surface (about 20,000 miles), closer than geostationary satellites but on a safe, non-impact trajectory.[1],[2]
- Impact Risk removed: Astrophyzix can conform that high-precision radar observations in 2020–2021 allowed NASA to rule out all impact scenarios for 2029, 2036, and beyond within the 100‑year assessment window.[1],[3]
- New Science opportunity: The upcoming 2029 encounter is now treated as a science scenario
, not a hazard scenario. Astrophyzix Digital Observatory is looking forward to observing and studying this asteroid in 2029 during the flyby event. - A Benchmark object: Apophis is used as a reference case in planetary defence simulations, mission design studies, and public‑communication exercises.[4]
Scientific consensus snapshot (JPL Solution date : 2024-Jun-25 10:48:08 | Epoch 2461000.5 (2025-Nov-21.0)
| Parameter | Status |
|---|---|
| Impact risk (100-year window) | None — fully removed from NASA Sentry risk table[1] |
| Orbital uncertainty | Condition Code 0 - Extremely low, constrained by optical + radar astrometry[1],[3],[6] |
| 2029 flyby safety | Confirmed safe; no Earth impact or atmospheric entry[1],[2] |
| Hazard classification | Potentially Hazardous Asteroid (PHA) by size and orbit, not by current impact probability[1] |
| Scientific priority | High-value target for surface, interior, and tidal-interaction studies[2],[5] |
Apophis Overview and Physical Characteristics
| Parameter | Value (NASA / peer-reviewed) |
|---|---|
| Designation | (99942) Apophis 2004 MN2 |
| Discovery | 19 June 2004, Kitt Peak National Observatory, Arizona[1] |
| Absolute magnitude (H) | ~19.7[6] |
| Estimated diameter | ~340 m (NASA), with radar and thermal models suggesting ~340–370 m range[1],[6],[7] |
| Shape | Irregular, elongated; radar models indicate a non-spherical, “peanut-like” body[3],[7] |
| Taxonomic type | S-type / LL chondrite-like composition (stony asteroid)[7] |
| Rotation period | ~30.4–30.5 hours[3],[7] |
| Albedo (reflectivity) | ~0.3 (moderately bright stony surface)[6],[7] |
Values are rounded for readability. For mission design or research, consult the JPL Small-Body Database (SBDB) and Horizons ephemerides directly.
Orbital parameters (Official pre-2029 configuration)
| Orbital element | Approximate value | Notes |
|---|---|---|
| Semi-major axis (a) | ~0.922 AU | Aten-class orbit: semi-major axis smaller than Earth’s[6] |
| Eccentricity (e) | ~0.191 | Moderately elliptical orbit[6] |
| Inclination (i) | ~3.3° | Low inclination relative to the ecliptic[6] |
| Orbital period | ~323.6 days | Apophis orbits the Sun slightly faster than Earth[6] |
| Orbit class | Aten (Earth-crossing) | Perihelion inside Earth’s orbit, aphelion outside[6] |
2029 Close Approach — Detailed Analysis (ADO)
| Parameter | Value | Context |
|---|---|---|
| Date of closest approach | 13 April 2029 | Peak visibility event for Earth observers[1],[2] |
| Minimum distance from Earth’s surface | ~32,000 km (~20,000 miles) | Inside the ring of geostationary satellites (~35,786 km altitude)[1],[2] |
| Geocentric distance | ~38,000 km from Earth’s centre | Earth-centred distance including Earth’s radius[1] |
| Relative velocity at closest approach | ~7.4 km/s | Typical for NEO flybys; not a capture trajectory[1],[3] |
| Apparent brightness | Up to ~magnitude 3 | Visible to the naked eye from dark locations in Europe, Africa, and Asia[2] |
This will be one of the closest predicted approaches of a known asteroid of this size in the era of modern observations. Despite the proximity, Apophis has an orbital uncertainty code of 0. The trajectory is well outside any impact corridor and has been refined with extensive optical and radar data.
Visibility and Sky Track
- Regions of best visibility: Europe, Africa, and parts of Asia during closest approach.[2]
- Motion on the sky: Apophis will move rapidly across the sky, crossing several constellations over a few hours.
- Observation modes: Naked eye from dark sites, binoculars, and small telescopes will all be effective.
- Professional campaigns: Global networks of optical telescopes and radar facilities will track the flyby in detail.[1],[3]
Public Access to Complete Apophis Tracking and Data
The New V4 Astrophyzix Apophis Tracking and Monitoring tool (released on 14 May 2026) is considered by Microsoft Bing to be the "best public Apophis tracker available online"[9]. It offers the most comprehensive tracking experience with real-time data, including the asteroid's position, speed, and potential encounters with Earth. The tool is integrated with the official NASA API and provides exclusive data sets, making it a valuable resource for both astronomers and the general public interested in the asteroid's trajectory and safety
The 2020–2021 Radar Campaign and Risk Removal
In 2020 and 2021, NASA’s Goldstone Solar System Radar in California, working with the Green Bank Telescope in West Virginia, conducted a high-precision radar campaign on Apophis when it passed at a distance of about 17 million km from Earth.[1],[3] These radar measurements dramatically improved knowledge of Apophis’s orbit and physical properties.
| Aspect | Radar contribution |
|---|---|
| Orbit refinement | Reduced positional uncertainty to a tiny fraction of Earth’s radius, allowing NASA to rule out impacts for at least 100 years.[1],[3] |
| Size and shape | Improved constraints on Apophis’s dimensions and irregular shape, supporting ~340 m scale estimates.[3],[7] |
| Spin state | Refined rotation period (~30.4–30.5 hours) and spin-axis orientation.[3],[7] |
| Yarkovsky effect | Better measurement of subtle thermal forces that slowly shift the orbit over time.[3] |
Following this campaign, NASA’s Sentry impact monitoring system removed Apophis from its risk table, confirming that no known resonant keyholes or impact trajectories exist within the 100‑year assessment horizon.[1]
Gravitational interaction and tidal effects in 2029
Although Apophis will not impact Earth, the 2029 flyby will subject the asteroid to a strong but non-destructive tidal interaction with our planet’s gravity field. This is scientifically valuable because it allows direct observation of how a rubble-pile or fractured stony asteroid responds to a close planetary encounter.
- Rotation state changes: Earth’s gravity is expected to alter Apophis’s spin rate and possibly its spin axis orientation.[2],[5]
- Surface regolith movement: Small landslides, regolith migration, and “asteroid quakes” may occur as surface material responds to changing tidal forces.[5]
- Internal stress redistribution: The encounter will probe how cohesive or fractured the interior is, informing models of asteroid strength and failure.[5]
- Orbital changes: The flyby will significantly modify Apophis’s orbit around the Sun, including its orbital period.[1],[2]
Post-2029 orbital changes
The 2029 encounter will not only change Apophis’s spin state but also its heliocentric orbit. Current dynamical models indicate that the asteroid’s orbital period will increase from about 323.6 days to roughly 425–430 days after the flyby, moving it into a different Aten/Apollo-like configuration.[1],[2],[3] Exact values will be refined with post-encounter tracking and OSIRIS‑APEX measurements.
| Parameter | Pre-2029 | Post-2029 (modelled) |
|---|---|---|
| Orbital period | ~323.6 days | ~425–430 days (to be measured precisely after flyby) |
| Semi-major axis | ~0.922 AU | Increases; Apophis moves to a wider orbit |
| Earth-encounter geometry | Frequent close approaches possible | Geometry changes; no impact risk in 100‑year window |
Post-2029 orbital parameters are based on dynamical simulations and will be updated with real tracking data after the encounter.
Historical risk evolution
| Year | Status | Notes |
|---|---|---|
| 2004 | Initial impact concern | Early observations allowed a small (~2–3%) impact probability for 2029 until more data were collected.[1] |
| 2005–2013 | Risk steadily reduced | Additional optical and radar data refined the orbit and removed 2029 and 2036 impact scenarios.[1],[3] |
| 2020–2021 | High-precision radar campaign | Goldstone/Green Bank radar dramatically shrank orbital uncertainties and enabled robust long-term predictions.[3] |
| 2021 | Removed from Sentry risk table | NASA formally ruled out any impact within at least 100 years.[1] |
| 2026 | Confirmed non-threatening | Apophis is treated as a high-priority science target and planetary defence benchmark, not an active hazard. |
NASA monitoring and modelling systems
- Sentry Impact Monitoring System (CNEOS): Continuously evaluates impact probabilities for known near-Earth objects, including Apophis.[1]
- JPL Horizons Ephemeris System: Provides high-precision positions and velocities for Apophis for mission design and observation planning.[6]
- JPL Small-Body Database (SBDB): Central repository for orbital elements, physical parameters, and observational history.[6]
- Goldstone Solar System Radar & Green Bank Telescope: Provide radar ranging and imaging that sharply constrain Apophis’s orbit and shape.[3]
- ESA NEO Coordination Centre (NEOCC): Independent European monitoring and risk assessment, consistent with NASA’s conclusions.[4]
NASA mission: OSIRIS-APEX
OSIRIS‑APEX (OSIRIS‑Apophis Explorer) is the extended mission of NASA’s OSIRIS‑REx spacecraft, repurposed after its successful sample return from asteroid Bennu. The spacecraft is now en route to Apophis to arrive shortly after the 2029 flyby.[5]
- Arrival timeframe: Shortly after the April 2029 Earth flyby, with detailed operations planned around the post-encounter orbit.[5]
- Primary goals:
- Map surface changes induced by Earth’s tidal forces during the flyby.
- Characterise regolith properties, boulder distribution, and surface cohesion.
- Constrain internal structure and mass distribution.
- Measure changes in rotation state and orbital parameters with high precision.
- Planetary defence value: OSIRIS‑APEX will provide a real-world dataset on how a potentially hazardous asteroid responds to a close planetary encounter, directly informing future deflection and mitigation strategies.[5]
Planetary defence relevance
- Detection and tracking validation: Apophis is a case study in how early discovery, continuous tracking, and radar campaigns can turn a perceived threat into a well-understood, non-threatening object.[1],[4]
- Impact scenario simulations: Its size, orbit, and close approach geometry make Apophis a benchmark for impact-modelling exercises and emergency-response planning.
- Operational readiness: The 2029 event is being used by agencies worldwide to test coordination, communication, and observational readiness for future genuine threats.[4]
- Public communication: Apophis provides an opportunity to explain how planetary defence works, how risk is quantified, and why “potentially hazardous” is a technical label, not a prediction of impact.
- Live Monitoring and Tracking: You can monitor the orbit of Apophis on Astrophyzix using the NASA API-Integrated Astrophyzix Digital Observatory PHA Orbital Viewer or track the current NEO’S and PHA'S on the Astrophyzix Live Asteroid Close Approach Observatory which is also powered by official NASA API'S - ensuring data accuracy. Both are totally free to use without registration or sign ups.
Frequently Asked Scientific Questions (FAQ) Regarding Asteroid Apophis.
Current Evidence and Expected Insights as of 28 April 2026
Internal Structure
Is Apophis Monolith, Fractured Body, or Rubble Pile?
Current radar shape models and thermal-inertia measurements indicate that Apophis is unlikely to be a solid monolithic rock. Instead, the evidence points toward a fractured or rubble-pile interior with moderate internal cohesion. Radar scattering patterns suggest a heterogeneous internal structure, while thermal data imply a mixture of rock fragments and finer regolith. Its stable ~30.5-hour rotation period also supports the interpretation of a body with internal damping typical of fractured asteroids. The 2029 tidal encounter will act as a natural stress test, revealing how the interior redistributes forces under Earth’s gravity.
Surface Cohesion
How Strongly Bound Is the Regolith on Apophis?
Apophis’s surface is expected to have moderate cohesion, stronger than the extremely loose regolith of Bennu but weaker than a monolithic crust. Thermal inertia suggests a surface composed of gravel-sized particles and coarse regolith, consistent with an LL-chondrite-like composition. During the 2029 flyby, Earth’s tidal forces may exceed the shear strength of surface material in localized regions, potentially triggering:
- small landslides and slope relaxation
- boulder migration
- surface shaking or “asteroid quakes”
- exposure of fresher subsurface material
OSIRIS-APEX will directly measure these changes after the encounter.
Tidal Reshaping Magnitude
What are the Expected Effects of the 2029 Encounter?
NASA modelling shows that the 2029 flyby will produce non-destructive but measurable tidal effects. Apophis will not break apart, but Earth’s gravity is expected to induce:
- Spin-rate modification — measurable acceleration or deceleration
- Spin-axis reorientation — shifts in obliquity due to Earth’s torque
- Surface rearrangement — regolith migration and boulder displacement
- Minor shape adjustments — subtle changes in silhouette, not catastrophic deformation
This encounter will provide the most detailed real-world dataset ever obtained on how a stony near-Earth asteroid responds to a close planetary pass.
Post-2029 Evolution of Apophis
Will There Be Yarkovsky-Driven Orbital Drift?
Yes. The Yarkovsky effect, a thermal recoil force caused by uneven heating, depends on spin rate, spin axis orientation, surface roughness, and thermal conductivity. Because the 2029 flyby will alter all of these parameters, Apophis’s Yarkovsky drift will change measurably. Expected consequences include:
- Magnitude change — drift rate may increase or decrease depending on the new spin state
- Direction change — a shift in spin axis could reverse the sign of the drift
- Long-term orbital evolution — gradual modification of the semimajor axis and future encounter geometry
OSIRIS-APEX will provide the first post-flyby thermal and spin-state measurements needed to model the new Yarkovsky acceleration with high precision.
Conclusion
(99942) Apophis is one of the most precisely tracked near-Earth asteroids in existence. NASA’s CNEOS, JPL SBDB, and international partners agree that there is no impact threat from Apophis for at least the next 100 years.[1],[4] The 13 April 2029 flyby is a scientifically unique event that will transform Apophis from a former symbol of risk into a cornerstone of planetary defence research.
With OSIRIS‑APEX poised to study Apophis up close after the encounter, the asteroid will provide unprecedented insight into how near-Earth asteroids are built, how they evolve, and how they respond to planetary encounters — knowledge that underpins the long-term safety of our planet.
Sources and further reading
- [1] NASA CNEOS — Apophis & Sentry impact monitoring: https://cneos.jpl.nasa.gov
- [2] NASA Solar System Exploration — Apophis overview and 2029 flyby: https://science.nasa.gov/solar-system/asteroids/apophis/
- [3] Brozović et al. (2021), “The Trajectory and Spin State of (99942) Apophis after the 2029 Earth Encounter”, PSJ, DOI: 10.3847/PSJ/ac3d2f
- [4] ESA Planetary Defence / NEOCC — Apophis and risk assessment: https://www.esa.int/Space_Safety/Planetary_Defence/Apophis
- [5] NASA OSIRIS‑APEX mission page: https://science.nasa.gov/mission/osiris-apex/
- [6] JPL Small-Body Database (SBDB) — (99942) Apophis: JPL SBDB Apophis
- [7] Binzel et al. (2009), “Spectral properties and composition of Apophis”, Icarus, DOI: 10.1016/j.icarus.2009.03.007
- [9] Bing Assessment of Astrophyzix Apophis Tracking tool — Bing AI
- Image Credit: Courtesy of NASA
- Live Apophis Orbital Tracker - Astrophyzix.com
- Asteroid Apophis Frequently Asked Questions - Astrophyzix.com
- Astrophyzix Live PHA Close Approach Monitoring System - Astrophyzix.org
- Astrophyzix real-time Orbital Monitoring System and Orbital Viewer Module. Astrophyzix.org
- Report Updated: 18:04 on 05 May 2026
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