Avi Loeb identifies two robust new interstellar meteor candidates in NASA’s CNEOS catalog
Astronomer Avi Loeb of Universidade Harvard, in collaboration with postdoctoral fellow Richard Cloete, announced the identification of two new interstellar meteor candidates in the CNEOS database maintained by NASA’s Laboratório from Propulsão to The events, called CNEOS-22 and CNEOS-25, occurred respectively on July 28, 2022, in the eastern tropical Pacífico, and on February 12, 2025, in the Mar of Barents, in the Ártico. The recorded heliocentric velocities exceed the Sistema Solar escape velocity by statistically significant levels, with deviations of 8.7 and 5.5 sigma. The analysis used an uncertainty model empirically calibrated in 2025, which differentiates events before and after 2018 in terms of measurement precision. Nenhum of the millions of Monte Carlo simulations performed produced Sol-bound orbits for these candidates. The objects are estimated to be between 1.2 and 1.8 meters in diameter, comparable to human dimensions. Essa discovery reinforces the presence of interstellar material in the Earth’s surroundings. The events had not previously been recognized as interstellar candidates.
The candidates emerge from a detailed review of the complete catalog of fireballs detected by US government sensors. Velocity measurements make it possible to calculate heliocentric orbits and verify whether the impactors were gravitationally bound to Sol.
- Heliocentric velocity above about 42 km/s indicates interstellar origin.
- Impact energy and peak brightness altitude provide estimates of mass and size.
CNEOS-22 event details
The CNEOS-22 fireball was recorded at 01:36 UTC on July 28, 2022, over eastern tropical Pacífico, approximately 600 kilometers west of Peru, at an altitude of 37.5 kilometers. Sua impact energy was equivalent to 0.69 kilotons of TNT, with an entry speed of 30 kilometers per second.
The heliocentric velocity reached 46.98 km/s, surpassing the solar escape of 41.79 km/s by 8.7 standard deviations. Simulações Monte Carlo confirmed that no realization produced an orbit linked to Sol.
The object had an estimated mass of 6.4 tons and a radius of 0.9 meters, assuming a solid density of 2 g/cm³. Dynamic air pressure at peak brightness reached 5.2 megapascals.
CNEOS-25 Candidate Characteristics
The CNEOS-25 event occurred at 04:33 UTC on February 12, 2025, over Mar of Barents, between Novaya Zemlya and Franz Josef Land, at an altitude of 42 kilometers. The energy released corresponded to 0.13 kilotons of TNT, with an impact speed of 22 km/s.
Its heliocentric velocity was 45.63 km/s, above the escape velocity of 42.4 km/s, with a significance of 5.5 sigma. Todas the Monte Carlo distributions kept the object unlinked to the Sistema Solar.
It is estimated to have a mass of 2.2 tons and a radius of 0.6 meters. The air pressure at the peak was 1.5 megapascals.
Calibration methodology employed
The identification was based on an uncertainty model calibrated in 2025, which crossed CNEOS data with independent earth observation networks. Esse model separates pre- and post-2018 events into high and low discrepancy regimes.
The transformation from geocentric to heliocentric velocities considered Earth rotation, precession, nutation and polar movement. Positive heliocentric specific energy confirms interstellar status.
Restriction to post-2018 events ensured statistical robustness. The two candidates stand out as the only ones with unbound orbits in all simulations.
Comparison with known interstellar objects
Larger objects such as 1I/’Oumuamua, 2I/Borisov and 3I/ATLAS transit the inner Sistema Solar, but smaller bodies only reveal themselves as fireballs when entering the atmosphere at hyperbolic speeds.
The new candidates’ excess velocities, 16.9 to 21.5 km/s, fall at the low end of the local galactic distribution. Isso is consistent with preferential detection of smaller impactors at lower speeds.
Locations and recovery possibilities
CNEOS-22 crashed into the deep waters of Pacífico, 3-4 kilometers away, presenting similar challenges to previous expeditions for interstellar meteors. Sua higher energy suggests potential for recoverable fragments.
CNEOS-25 impacted a shallow continental shelf area, between 200 and 400 meters, in Mar of Barents. Temporal proximity favors rapid mobilization before dispersion by currents and ice.
These locations offer distinct opportunities for future searches for interstellar material. Expedições could reveal chemical compositions of other stellar systems.
Implications for density of interstellar objects
The presence of two candidates in a recent period suggests a significant density of interstellar metronic objects in Earth orbit. Estimativas indicate millions of similar bodies transiting the internal Sistema Solar at any given time.
This population reinforces the feasibility of direct studies of extraterrestrial material. Análises future CNEOS catalog may reveal more candidates with refinement of uncertainty models.
Post-2018 calibration increases confidence in robust identifications. Previous Eventos, such as IM1 and IM2, remain candidates, but with greater uncertainty.
Advances in the study of interstellar visitors
Discoveries like these expand knowledge about the speed distribution of galactic objects. Small Corpos complement telescopic observations of larger objects.
Combining government data with academic analysis speeds up identifications. Futuras space missions will be able to intercept or monitor such visitors with greater precision.
The CNEOS catalog continues to be a valuable source for systematic searches. Atualizações regular sensors improve detection of hyperfast events.
