NASA Asteroid Hitting Earth – No Imminent Threats

Every day, automated systems at NASA and its partner institutions scan the skies for objects that could threaten Earth. Right now, according to the space agency’s own monitoring infrastructure, there are no asteroids or comets on any collision course with our planet. The question of whether a NASA asteroid is hitting Earth today has a clear, data-backed answer: it is not.

NASA’s planetary defense coordination office operates a network of telescopes and radar installations that collectively track over 25,000 near-Earth objects. These range from small house-sized rocks that would burn up in the atmosphere to massive asteroids centuries away from any close approach. The most scrutinized target in recent years has been Apophis, a 450-meter asteroid that briefly alarmed scientists when it was discovered in 2004.

Today, decades of observations have ruled out every plausible impact scenario for Apophis, and the broader near-Earth object catalog shows no imminent threats. Understanding how NASA tracks these objects, what risks remain on longer timescales, and how ordinary people can monitor the same data forms the core of what follows.

Is an asteroid hitting Earth today according to NASA?

No. As of the latest assessments from NASA’s Center for Near-Earth Object Studies (CNEOS) at JPL, no known asteroid has a significant probability of impact within the next 100 years. The systems responsible for this determination—Sentry, ATLAS, and ground-based radar networks—continuously update their calculations as new observations arrive.

When an object first appears in survey data, uncertainty in its orbit can translate into a small chance of Earth impact. This is normal and expected. Over weeks or months, additional measurements refine the trajectory until the impact probability drops to zero, as it has for every object that initially raised concern.

Current Monitoring Status at a Glance

Key Insights on NASA Asteroid Monitoring

• NASA’s Sentry system has assessed all known near-Earth objects for impact probability over the next century
• Apophis, once rated at Torino scale 4 (high concern), has been downgraded to confirmed safe through radar and optical observations
• The 2029 close approach of Apophis passes at 32,000 kilometers—closer than geosynchronous satellites but with zero collision risk
• 2024 YR4, a smaller asteroid also under observation, carries no significant risk for its 2032 passage
• New discoveries follow the same refinement process: initial uncertainty resolves to zero risk over time
• The Yarkovsky effect—thermal radiation pushing an asteroid over time—is now factored into long-term trajectory models

Tracked Asteroid Risk Summary

What is NASA’s asteroid tracker for Earth impacts?

NASA operates several tools designed to monitor, predict, and publicly communicate near-Earth object activity. The most comprehensive public-facing platform is Eyes on Asteroids, an interactive 3D application that visualizes known objects, their orbits, and upcoming close approaches in real time. Users can explore the solar system, zoom into specific asteroids, and see when each object will make its nearest pass to Earth.

Behind the scenes, the primary analytical engine is Sentry, an automated system maintained by JPL’s CNEOS. Sentry scans the near-Earth object catalog multiple times per day, checking every object for potential impact trajectories over the next 100 years. When a newly discovered object shows a non-zero impact probability, Sentry alerts scientists, who then prioritize follow-up observations.

The Sentry Monitoring System

Sentry was built to eliminate the need for manual calculations on every asteroid in the catalog. When an object enters the system, complex gravitational models account for the Sun, all planets, and major moons. The system also incorporates non-gravitational forces—most importantly the Yarkovsky effect, where thermal radiation from a rotating asteroid subtly shifts its orbit over decades.

The result is a probabilistic assessment for each object. A newly discovered asteroid might show a 1-in-1,000 chance of impact in 2075. Within weeks, additional telescope measurements reduce that fraction until it falls below one-in-a-million—a threshold at which NASA considers the risk statistically irrelevant. This threshold is not arbitrary; it reflects the current state of observational accuracy and the statistical likelihood of undiscovered objects.

Public Access to Tracking Data

CNEOS publishes its full risk table online at cneos.jpl.nasa.gov/sentry. Anyone can view the current list of objects under observation, their impact dates, probabilities, and energy estimates. The table updates automatically as new data arrives. No login or special software is required.

For visual learners, Eyes on Asteroids serves as a companion tool, rendering the same data in a navigable 3D interface. Both resources draw from the same underlying catalog, meaning the numbers align exactly.

Will a NASA-tracked asteroid hit Earth in 2029?

No. The asteroid Apophis (designation 2004 MN4) will make a close approach on April 13, 2029, passing approximately 32,000 kilometers from Earth’s surface. This is closer than the 36,000-kilometer altitude of geosynchronous weather and communications satellites. Despite that proximity, NASA has conclusively ruled out any collision—for the 2029 pass and for at least the next century thereafter.

The journey to this determination began in June 2004, when astronomers at Kitt Peak National Observatory first flagged a moving object that appeared to cross Earth’s orbit. Within days, calculations suggested a small but non-zero chance of impact in 2029. The object was given the preliminary designation 2004 MN4 and quickly rose to the top of planetary defense attention lists.

How the risk assessment evolved

Initial observations gave 2004 MN4 a 2.7 percent probability—about 1 in 37—of striking Earth in 2029. That may sound low, but for planetary defense, any measurable chance demands immediate attention. Scientists began refining the orbit using optical telescopes around the world.

By early 2005, the impact probability had dropped to nearly zero, but questions remained about 2036 and 2068, years where the asteroid could pass through gravitational keyholes—narrow zones where Earth’s gravity would tweak its trajectory just enough to put it on a collision course for a later pass. Further observations eliminated those scenarios as well.

The game-changing data arrived in 2021, when radio telescopes bounced signals off Apophis as it passed within 17 million kilometers of Earth. The radar reflections allowed scientists to measure the asteroid’s distance to within 200 meters and recalculate its future positions with unprecedented precision. The result confirmed that Apophis would miss Earth by over 47,000 kilometers—not 32,000—making the 2029 pass unambiguously safe.

What a hypothetical Apophis impact would mean

The reason Apophis commanded so much attention becomes clear when examining the consequences of an impact. Scientists estimate that a collision would release energy exceeding 1,000 megatons of TNT—equivalent to tens to hundreds of nuclear weapons detonated simultaneously. The resulting craters and shockwaves would devastate an area hundreds of kilometers wide.

USGS scientists have modeled the environmental cascade: seismic shaking across continental distances, ejecta falling from the sky, potential secondary effects on infrastructure. While the probability of this scenario has been reduced to zero for Apophis, the exercise underscores why NASA maintains constant vigilance.

Is an asteroid set to hit Earth in 2032?

There is no significant risk of an asteroid impacting Earth in 2032 according to current NASA assessments. The object 2024 YR4, discovered in late 2024, received initial attention when early trajectory calculations suggested a narrow window of possibility. However, as with all newly discovered near-Earth objects, subsequent observations have progressively narrowed the range of possible futures.

NASA’s Sentry system lists 2024 YR4 as under routine monitoring. The current probability of impact in December 2032 falls well below any threshold that would trigger heightened concern. Scientists continue to track the object, not because it poses a threat, but because that is the standard process for any asteroid with non-zero initial uncertainty.

The pattern behind new discoveries

When a telescope first images an object, its trajectory is constrained by only a handful of position measurements taken over a few nights. This limited dataset produces a probability distribution that extends across a wide arc of possible future locations. Some of those positions intersect Earth’s orbit at some future date, creating the appearance of risk.

Within weeks, additional observations shrink that arc. The distribution of possible positions narrows until it no longer overlaps with Earth. For 2024 YR4, this refinement is ongoing, and the trend toward zero impact probability matches the trajectory seen with Apophis, 2004 MN4, and hundreds of other objects before it.

When is the next asteroid predicted to hit Earth?

The next predicted close approach does not equate to a predicted impact. Every near-Earth object passes Earth at some distance, and the vast majority pass harmlessly. The question of “when does the next asteroid hit” has a straightforward answer: none are predicted to do so within any meaningful timeframe, according to the comprehensive catalog maintained by NASA and its international partners.

The Sentry monitoring table shows zero objects with impact probability above the minimum threshold. This does not mean the catalog is complete—small objects strike Earth frequently in astronomical terms, with objects the size of a car or smaller burning up in the atmosphere several times per year. However, these events involve rocks too small to track in advance and pose no threat to people or infrastructure.

Historical Timeline of Significant Asteroid Events

1. December 2004: Astronomers at Kitt Peak discover 2004 MN4 (later named Apophis), calculating an initial 2.7 percent chance of 2029 impact—marking the start of one of the most intensive tracking campaigns in planetary defense history.
2. January 2005: Additional observations refine Apophis’s orbit, reducing 2029 impact probability to near zero while flagging possible 2036 and 2068 scenarios through keyhole passages.
3. 2013: The Chelyabinsk airburst occurs when an undetected 18-meter asteroid explodes over Russia, injuring over 1,500 people and demonstrating that small, untracked objects can cause real damage.
4. 2021: Radar observations of Apophis during a distant pass provide the precision data needed to eliminate all future impact scenarios, including the 2036 and 2068 windows.
5. December 2032: Current monitoring shows 2024 YR4 passing Earth at a distance yet to be precisely determined, but with no projected impact probability.

The timeline reflects a broader trend: initial concern resolving into confirmed safety as observational data accumulates. Each case follows the same pattern, with the eventual outcome always being the elimination of impact risk.

Impact Risks: What NASA Confirms vs. What Remains Uncertain

NASA’s public communications about asteroid risk consistently draw a line between what is known and what is not. This distinction matters because it reflects how science actually works—confidence grows incrementally, and uncertainty is quantified rather than ignored.

What NASA Confirms with High Confidence

• No known asteroid has a significant probability of Earth impact within the next 100 years
• Apophis will pass safely in 2029 at approximately 32,000 kilometers from Earth’s surface
• The initial risk ratings for Apophis (Torino scale 4, Palermo scale 1.10) have been reduced to zero through observational refinement
• The 2029 pass geometry avoids all gravitational keyholes that could redirect the asteroid toward a future impact

What NASA Acknowledges as Uncertain or Ongoing

• Small objects (below detection thresholds) remain undiscovered and can only be cataloged after they pass or enter the atmosphere
• New discoveries enter the system with uncertain trajectories that require weeks of follow-up to resolve
• The Yarkovsky effect’s long-term influence on asteroid orbits introduces minor uncertainties in century-scale predictions
• Completeness of the near-Earth object catalog is estimated at roughly 40 percent for objects large enough to cause regional destruction

NASA’s Role in Asteroid Detection and Defense

The National Aeronautics and Space Administration operates planetary defense as a coordinated effort across multiple centers and international partners. The Planetary Defense Coordination Office (PDCO) within NASA’s Science Mission Directorate oversees the effort, while JPL’s CNEOS handles data analysis and risk assessment. Ground-based telescopes and radar installations worldwide feed observations into shared systems that all participating agencies can access.

This international dimension matters. NASA’s NEO Observations Program funds telescope networks across the globe, and the agency participates in the International Asteroid Warning Network (IAWN), a UN-backed framework for sharing data about potentially hazardous objects. When a newly discovered asteroid raises concern, scientists at multiple institutions worldwide receive alerts within hours.

The science is clear on one point: a large impact is survivable as a species, but devastating on a regional scale. The Chelyabinsk event of 2013 demonstrated that a relatively small, undetected object can cause hundreds of injuries and millions of dollars in damage. Planetary defense aims to prevent such events through early detection and, if necessary, intervention.

Official NASA Statements and Data Sources

The most authoritative statements about asteroid risk come directly from NASA and JPL through their web properties and published assessments. These sources reflect the consensus of the scientific teams analyzing the data.

“Analysis shows that asteroid Apophis poses no significant risk to Earth for at least the next 100 years.”

— NASA Analysis: Earth is safe from asteroid Apophis for 100-plus years

“Observations and analysis continue to rule out all potential impact scenarios for Apophis in 2029, 2036, and 2068.”

— Planetary Society: Will Apophis hit Earth

These statements represent the current state of scientific knowledge. As new observations arrive, the data underlying them will be updated—but the fundamental conclusion, that no known asteroid poses an imminent impact threat, is not expected to change based on everything currently in the catalog.

Upcoming Asteroid Events and Monitoring

The next notable close approach involving a well-known object is Apophis in April 2029. Amateur astronomers with modest equipment will be able to observe it passing Earth, and NASA’s radio telescopes will continue refining its trajectory in the months leading up to the event.

Beyond that, routine monitoring continues. Every few weeks, survey telescopes flag new candidates. Each one follows the same path from initial uncertainty to confirmed safety. The Sentry table will show some objects with tiny fractional probabilities until additional observations narrow their trajectories.

For the public, Eyes on Asteroids provides the most accessible window into this ongoing work. The interactive tool updates automatically with new discoveries and refined orbits, offering anyone with internet access the same data that scientists use to assess risk.

The answer to whether a NASA asteroid is hitting Earth today remains a clear no—and the systems in place are designed to keep that answer current for as long as humanity continues to watch the skies.

Frequently Asked Questions