Radar and Infrasound Observations of the 2026 May 30 Cape Cod Bay Superbolide

Juha Vierinen; Ryan Volz; Marc Fries; Elizabeth A. Silber; Sarah Albert; Philip J. Erickson; Matthias Clahsen; Frank D. Lind; Nico Pfeffer; John Swoboda; Allan Weatherwax; Simon G. Shepherd; Jorge L. Chau

AI summary · arXiv: 2610.24566v1 · astro-ph.EP

Radar and Infrasound Observations of the 2026 May 30 Cape Cod Bay Superbolide

Juha Vierinen, Ryan Volz, Marc Fries, Elizabeth A. Silber, Sarah Albert, Philip J. Erickson, Matthias Clahsen, Frank D. Lind,

and 5 more authors

Nico Pfeffer, John Swoboda, Allan Weatherwax, Simon G. Shepherd, Jorge L. Chau

Original paper Submitted to arXiv on 17 Oct. 2026 24 pages, 12 figures. Submitted to The Astronomical Journal License: CC BY 4.0

How to read this summary? Illustrated guide

The essentials

Combined radar and infrasound observations trace the Cape Cod Bay bolide from upper-atmospheric entry to falling meteorites, constraining its trajectory, orbit, fragmentation region, and likely mechanical strength.

Question

How can the 2026 Cape Cod Bay bolide’s atmospheric trajectory, pre-impact orbit, fragmentation, and meteorite fall be reconstructed from observations? What do these measurements imply about the meteoroid’s strength and possible composition?

Method

The authors combined 31.65 MHz VHF meteor-radar head-echo and plasma-trail measurements with four weather-radar datasets, infrasound records from 199 sensors, and optical observations. They fitted the trajectory using 229 range measurements, 137 Doppler measurements, and 146 trail positions, then used dark-flight modeling and backward orbit propagation; infrasound analysis used five retained single-station detections and two multi-sensor directional measurements.

Findings

Result VHF radar detected the head echo from about 90 to 71 km altitude and plasma-trail echoes down to a 33.61 km radar terminus.
See the passage in the paper
Trail echoes remain detectable far below the head-echo interval, down to approximately 30 km.
Result Weather-radar detections and dark-flight modeling place the likely meteorite strewn field in Cape Cod Bay, with six radar-constrained modeled fragments ranging from 3.2 g to 1.425 kg.
See the passage in the paper
The six weather-radar-constrained landing solutions shown in Figure 8 have modeled masses from 3.2 g to 1.425 kg.
Authors’ interpretation The reconstructed heliocentric orbit lies near the cometary–asteroidal classification boundary, and the catalogue search found no convincing parent-body or established-shower association.
See the passage in the paper
The reconstructed orbit lies near the cometary–asteroidal classification boundary, with no convincing association with a catalogued parent body or established meteor shower.
Authors’ interpretation The authors interpret the radar and dark-flight evidence as consistent with a dense, mechanically strong meteoroid, possibly iron-rich, while noting that its composition is unconfirmed.
See the passage in the paper
The radar and dark-flight evidence are consistent with a dense, mechanically strong meteoroid, possibly iron-rich, but the composition remains to be confirmed by recovered material or independent compositional constraints.
Result Infrasound analysis estimated an energy of 0.45 kt TNT equivalent and its directional measurements supported a source near the radar terminus.
See the passage in the paper
Applying the multi-station bolide period-yield relation of E. A. Silber et al. [62] gives an infrasonic energy estimate of 0.45 kt TNT equivalent.

Limitations

The radar-derived total fall-mass method is unvalidated and excludes larger meteorites that may have escaped radar detection.
See the passage in the paper
This radar-reflectivity method is unverified, and the iron-composition survival assumption is not a composition determination.
The meteoroid’s composition has not been confirmed by recovered material or independent compositional constraints.
See the passage in the paper
the composition remains to be confirmed by recovered material or independent compositional constraints.
The trajectory and terminus are supported by the weather-radar detections, but this is not a fully independent validation because the dark-flight model uses the meteor-radar trajectory and terminus as inputs.
See the passage in the paper
Agreement between the detections and the modeled dark flight therefore supports the reconstructed fall sequence, although it does not provide a fully independent validation of the meteor-radar trajectory.

Why it matters

The authors argue that meteor-radar plasma tracking, together with weather-radar and infrasound measurements, can connect atmospheric entry to near-ground meteorite fall and enable reconstruction of orbits and fragmentation regions. These observations also provide constraints for models of hypersonic shock flow, plasma wakes, and acoustic radiation.

Written by AI from the paper. Passages are checked word for word against the text we analysed; the rest may contain errors.

AI-generated keywords: Cape Cod Bay superbolide; meteorite fall; meteor radar; infrasound; meteoroid orbit

Read further

Comprehensive Summary
Layman's Summary
Blog article
Original abstract

The paper reconstructs the atmospheric entry and likely meteorite fall of the 30 May 2026 Cape Cod Bay superbolide. It examines whether observations from multiple sensor types can connect the meteoroid’s upper-atmosphere trajectory and pre-impact orbit with its fragmentation and surviving fragments. The daytime bolide’s reported impact energy was 1.1 kilotons of TNT equivalent. The authors combine VHF meteor-radar measurements of entry-generated plasma, weather-radar detections of descending solid fragments, and infrasound recordings of the atmospheric shock. They also compare their reconstruction with optical observations and astronomical catalogues. The VHF radar network detected plasma surrounding the meteoroid rather than the solid body itself. The authors used range, Doppler, and interferometric measurements to fit the trajectory, while plasma positions in the wake extended the track below the altitude at which the head echo was visible. The fitted path descended from about 90 km to a radar terminus at 33.61 km. The authors interpreted weather-radar signatures as falling meteorites and combined them with wind measurements in a dark-flight model to estimate fragment paths and landing locations. They screened infrasound recordings from stations within 2,000 km for plausible arrivals. Array processing and envelope timing constrained the direction of the signals, while their periods were used to estimate the event’s energy. Finally, the authors propagated the radar-derived trajectory backward to estimate the meteoroid’s heliocentric orbit. The entry track was steep and southeastward, with a speed of about 26 km/s at 100 km altitude. Head echoes disappeared near 72 km, but short-lived wake echoes remained detectable down to about 30 km. The authors identify 33.61 km as the radar terminus and interpret it as the end of detectable plasma production, likely associated with breakup. Weather radars detected fragments as low as 7.6 km above mean sea level. The modeled fall region is centered in Cape Cod Bay, with a strewn field roughly 6 km east–west by 5 km north–south. Six radar-constrained fragment solutions have modeled masses ranging from 3.2 g to 1.425 kg. Estimates of total surviving mass vary widely: 560 kg based on an assumed 10% survival rate for an iron body, compared with 82 kg from a radar-reflectivity method that the authors describe as unvalidated and incomplete. Several observations suggest that the meteoroid was relatively dense and mechanically strong, and possibly iron-rich, although its composition has not been established. Its modeled dynamic pressure reached about 7 MPa near the terminus. The head-echo spectra showed no resolved signs of fragmentation during the observed segment, and the modeled fragment distribution contains relatively few small meteorites. The paper estimates a pre-atmospheric mass of about 5,600 kg based on an external estimate. However, the radar measurements did not resolve deceleration and therefore cannot independently determine the mass. The reconstructed orbit has a semimajor axis of 2.44 AU, an eccentricity of 0.752, and a Jupiter Tisserand parameter of 2.99, near the conventional boundary between cometary and asteroidal orbits. Empirical classification criteria produce conflicting results, and comparisons with catalogues reveal no convincing parent asteroid, comet, or established meteor-shower association. Infrasound yields an energy estimate of about 0.45–0.51 kilotons, below the CNEOS estimate of 1.1 kilotons but within the reported dispersion of empirical energy relations. The authors conclude that combining radar, weather radar, and infrasound can trace large bolides from atmospheric entry toward ground impact and help constrain their orbits and fragmentation.

From a Bright Flash to a Possible Meteorite Strewn Field

On 30 May 2026, a brilliant daytime fireball crossed the sky over Cape Cod Bay. The event, classified as a superbolide, released an estimated 1.1 kilotons of TNT equivalent in the atmosphere. But how far did the meteoroid travel before it broke apart, and how much of it may have reached the ground?

In Radar and Infrasound Observations of the 2026 May 30 Cape Cod Bay Superbolide, Juha Vierinen, Ryan Volz, Marc Fries, Elizabeth A. Silber, Sarah Albert, Philip J. Erickson et al. combine measurements from meteor radar, weather radar, and infrasound stations. Together, these observations help trace the event from its high-altitude path toward a possible meteorite fall, while also offering clues about the object’s strength, mass, and orbit.

Three Ways to Follow a Bolide

Each measurement method captures a different part of the event. VHF meteor radar detects plasma produced around an incoming meteoroid, rather than imaging the solid object itself. Weather radar can pick up signals from fragments descending through the atmosphere. Infrasound stations record low-frequency pressure waves generated by the atmospheric shock.

The researchers fitted the upper-atmosphere trajectory using the meteor radar’s range, Doppler, and interferometric measurements. They also used the positions of plasma in the meteoroid’s wake to extend the track below the altitude where the radar could still detect the bright plasma surrounding the body.

To estimate where possible meteorites might have landed, the team interpreted weather-radar detections as falling fragments and combined them with wind measurements in a dark-flight model. For the infrasound analysis, they screened recordings from stations within 2,000 km, using signal timing and array processing to assess likely arrival directions. The signals’ periods also helped estimate the event’s energy.

A Steep Track and a Radar Terminus

The reconstructed entry path was steep and headed southeast. At an altitude of 100 km, the meteoroid was traveling at about 26 km/s. Radar head echoes, which track plasma near the incoming body, disappeared at around 72 km. Short-lived echoes from the wake continued much farther down, reaching roughly 30 km.

The fitted trajectory ended at 33.61 km, which the authors call the radar terminus. They interpret this point as the end of detectable plasma production, likely connected to the object’s breakup. That interpretation does not mean radar observed a solid body intact all the way to that altitude: the measurements tracked plasma, and the head and wake echoes represent different parts of the interaction with the atmosphere.

The team estimated that dynamic pressure near the terminus reached about 7 MPa. Spectra from the observed head echoes showed no resolved evidence of fragmentation during that segment, while the modeled distribution of falling fragments contained relatively few small meteorites. These clues are consistent with an object that was comparatively dense and mechanically strong. An iron-rich composition is possible, but the paper does not establish what the meteoroid was made of.

Where Might Fragments Have Fallen?

Weather-radar signatures were detected as low as 7.6 km above mean sea level. When those detections were combined with wind data, the modeled fall region was centered in Cape Cod Bay. The estimated strewn field spans roughly 6 km from east to west and 5 km from north to south.

The analysis produced six radar-constrained fragment solutions, with modeled masses ranging from 3.2 g to 1.425 kg. These are modeled possibilities, not a confirmed inventory of recovered meteorites. Estimates of the total surviving mass also vary substantially. One estimate is 560 kg, based on an assumed 10% survival rate for an iron body. A radar-reflectivity method gives 82 kg, but the authors describe that approach as unvalidated and incomplete.

The paper also cites an external estimate of about 5,600 kg for the meteoroid’s pre-atmospheric mass. The radar observations themselves could not resolve deceleration, so they cannot independently determine that mass. The difference between estimated starting mass and potential surviving mass therefore depends on assumptions and methods that remain uncertain.

An Orbit Without a Clear Parent

By propagating the radar-derived trajectory backward, the authors estimated the meteoroid’s orbit around the Sun. The reconstructed orbit has a semimajor axis of 2.44 AU and an eccentricity of 0.752. Its Jupiter Tisserand parameter is 2.99, close to the conventional boundary often used to distinguish comet-like from asteroid-like orbits.

That borderline value does not settle the object’s origin. Empirical classification rules give conflicting answers, and comparisons with astronomical catalogues reveal no convincing parent asteroid, comet, or established meteor-shower association. The orbit is informative, but it does not yet point to a known source.

Why Energy Estimates Differ

Infrasound recordings yield an estimated energy of about 0.45–0.51 kilotons of TNT equivalent, below the CNEOS estimate of 1.1 kilotons. The authors note that the infrasound result falls within the reported dispersion of empirical energy relations. Rather than treating the estimates as interchangeable, the comparison highlights the uncertainty involved in inferring a bolide’s energy from different kinds of measurements.

The study’s broader result is that combining radar, weather radar, and infrasound can connect several stages of a large bolide event: its atmospheric entry, the production and descent of fragments, and clues to its pre-atmospheric orbit. The Cape Cod Bay case shows how much these complementary observations can reveal—and how questions about composition, total surviving mass, and exact origin remain open.

Created on 31 Oct. 2026

Was this synthesis useful?

Score: 0

Ask questions about this paper to our AI assistant

How to chat with this paper? Illustrated guide

Compare with the PDF

You can also chat with multiple papers at once here.

AI assistant instructions?

Tools for this paper

Explain it differently 3 free rewrites left today

Save to a collection Group papers in collections to compare them, chat with them and export them. Create a free account Log in

Export BibTeX · RIS (Zotero, Mendeley, EndNote) · Markdown (Notion, Obsidian)

Advanced tools Premium

For researchers who follow a field closely: citation alerts, journal-club slides, version comparison and Zotero export. Discover Premium

Zotero

Citation alerts Citation alerts guide

Who works on it? The people and institutions who publish on its topic

Weekly letter Presented in "Climate and Earth this week" of 26 October 2026. Climate and Earth this week: Separating signals, tracing origins

Journal club Premium+ Slides to present it

Versions What changed between versions

Talk about it in public Premium+ Press kit: release, questions, hype check Press kit guide

Papers around this one

See them on a map

Ranked by how close their title and abstract are to this paper’s. Select some to read them together.

Closest papers

Related
Seismoacoustic Analysis of a Falcon 9 Rocket Stage Re-Entry Over Central Europe on 19 February 2025
P. Hupe, Christoph Pilger, J. Assink et al. · 2026 · Pure and Applied Geophysics · Not summarized yet

Abstract
On 19 February 2025, a SpaceX Falcon 9 rocket stage re-entered the atmosphere over Ireland’s west coast. It produced a sustained fireball along its trajectory across the United Kingdom, the Netherlands, northern Germany, and western Poland. Seismic and infrasound stations in the Netherlands and Germany, as well as infrasound arrays in Sweden and Norway, recorded the event. We characterise the re-entry as a line source and reproduce the trajectory using the seismoacoustic observations of more than 80 stations. The majority of the stations detected two distinct signal arrivals. We investigate the detection pattern with varying time intervals between these signals across the station networks, b…
Related
The May 2024 Geospace Superstorm and Its Impact on the Global Electric Circuit Worldwide
J. Tacza, Gang Li, Shuai Fu et al. · 2026 · Journal of Space Weather and Space Climate · Not summarized yet

Abstract
In May 2024, a sequence of intense solar eruptions—including multiple M- and X-class flares and several coronal mass ejections (CMEs)—from solar active regions 3663 and 3664 triggered one of the most extreme geomagnetic storms of Solar Cycle 25. The storm produced a minimum disturbance storm-time index (Dst) of –406 nT and a peak interplanetary magnetic field (IMF) magnitude of $\sim$70 nT at the first Lagrangian point (L1). This event also generated a large Forbush Decrease (FD) in galactic cosmic rays and a Ground-Level Enhancement (GLE) of solar energetic particles, offering a unique opportunity to assess solar–terrestrial coupling through the Global Electric Circuit (GEC). %We analyzed f…
Related
Understanding space weather phenomena responsible for different impacts on spacecraft during the May 2024 extreme geomagnetic storm
T. Nagatsuma, K. Sakaguchi, Y. Kubo · 2026 · Earth, Planets and Space · Not summarized yet

Abstract
Extreme geomagnetic storms pose significant risks to spacecraft operations through enhanced particle radiation, geomagnetic disturbances, and thermospheric density variations. In this study, we comparatively analyze three extreme geomagnetic storms with minimum Dst indices below − 350 nT: October 29–31, 2003, November 20–22, 2003, and May 10–12, 2024. Using space- and ground-based observations, we examine the associated solar flares, coronal mass ejections (CMEs), interplanetary conditions, high-energy particle environments at geosynchronous orbit, and reported spacecraft impacts. Although the three storms exhibited comparable geomagnetic intensities, their solar and interplanetary drivers d…
Related
Hint of an exocomet transit in the CHEOPS lightcurve of HD 172555
F. Kiefer, V. Van Grootel, A. Lecavelier des Etangs et al. · 2023 · A&A 671, A25 (2023) · AI summary available

Abstract
HD$\,$172555 is a young ($\sim$20$\,$Myr) A7V star surrounded by a 10$\,$au wide debris disk suspected to be replenished partly by collisions between large planetesimals. Small evaporating transiting bodies, exocomets, have also been detected in this system by spectroscopy. After $\beta\,$Pictoris, this is another example of a system possibly witnessing a phase of heavy bombardment of planetesimals. In such system, small bodies trace dynamical evolution processes. We aim at constraining their dust content by using transit photometry. We performed a 2-day-long photometric monitoring of HD$\,$172555 with the CHEOPS space telescope in order to detect shallow transits of exocomets with a typical…
Related
Prompt emission of relativistic protons up to GeV energies from M6.4-class solar flare on July 17, 2023
Carlos Navia, Marcel Oliveira, Andre Nepomuceno · 2023 · Solar and Stellar Astrophysics · Not summarized yet

Abstract
We show evidence of particle acceleration at GEV energies associated directly with protons from the prompt emission of a long-duration M6-class solar flare on July 17, 2023, rather than from protons acceleration by shocks from its associated Coronal Mass Ejection (CME), which erupted with a speed of 1342 km/s. Solar Energetic Particles (SEP) accelerated by the blast have reached Earth, up to an almost S3 (strong) category of a radiation storm on the NOAA scale. Also, we show a temporal correlation between the fast rising of GOES-16 proton and muon excess at ground level in the count rate of the New-Tupi muon detector at the central SAA region. A Monte Carlo spectral analysis based on muon ex…
Related
Detection and Analysis of an Upward Jet‐Like Electrical Discharge Intercepting a High‐Altitude Research Aircraft
T. Lang, A. Mezentsev, M. Quick et al. · 2026 · Geophysical Research Letters · Not summarized yet

Abstract
During a 2023 field campaign, a NASA ER‐2 research aircraft intercepted an upward jet‐like electrical discharge at 20 km altitude over an intense tropical thunderstorm. This event was analyzed using airborne multispectral optical sensors, electric field mills, X‐band radar, passive microwave, and ground‐based radio networks. Optical observations revealed a streamer‐dominated discharge characterized by strong ultraviolet (∼340 nm) emissions and limited thermalization, explaining the lack of airframe damage. Radio observations indicated that the discharge was initiated by a narrow bipolar event near cloud top. Electric field measurements found that fields due to charge on the aircraft were clo…
Related
GPS phase and amplitude scintillation at high latitudes during the extreme geomagnetic storm of May 2024
P. Prikryl, A. McCaffrey, J. Weygand et al. · 2026 · Earth, Planets and Space · Not summarized yet

Abstract
The May 2024 geomagnetic storm was the most intense in recent decades, significantly affecting the Earth magnetosphere and ionosphere. We investigate GPS amplitude and phase scintillation during the main and recovery phases of the storm using GPS receivers including the specialized scintillation receivers of the Canadian High Arctic Ionospheric Network (CHAIN). We primarily compute 30-s scintillation indices using GPS receivers sampling at a 50 Hz rate or higher, complemented by 1-Hz GPS receivers providing a proxy scintillation index. The occurrence of GPS scintillation is studied in the context of ionospheric convection observed by SuperDARN, horizontal equivalent ionospheric currents and …
Related
Chondrules as fallout from vaporizing impacts in the solar nebula
Nick Choksi, Eugene Chiang, Harold C. Connolly Jr. et al. · 2020 · Earth and Planetary Astrophysics · AI summary available

Abstract
We consider how chondrules, once-molten mm-sized spheres filling the oldest meteorites, may have formed as the thermally processed fallout from planetesimal collisions in the primordial solar nebula. We focus on the cloud of hot and dense silicate vapor released from a collision, and its expansion into cold and rarefied nebular hydrogen. Collisional particle debris, including chondrule precursors, are entrained by the cloud and melted by it, via gas conduction and radiation emitted by dust grains that condense out of the cloud. Conduction and radiation lock vapor, dust, and proto-chondrules to a common temperature, which falls as the cloud expands. Latent heat released by condensation slows …

Go further

How are these papers found?

We compare the title and abstract of this paper with those of every paper summarized on this site, and with the papers Semantic Scholar recommends, those it cites and those citing it (for a much-cited paper, its most recent citations and, from OpenAlex, the most cited ones). Among the prior work and the follow-ups, the papers that use each other in depth, a method it uses and the much-cited follow-ups come a little higher. The levels (very close, close, related) come from the similarity of the texts, not from a judgment of quality; * marks a paper without an abstract, compared by its title. The sentence under a paper is written by an AI from the two abstracts: check it in the papers. A paper marked not relevant by three readers leaves the list.

Updated on 31 October 2026.

Disclaimer: The AI-based summarization tool and virtual assistant provided on this website may not always provide accurate and complete summaries or responses. We encourage you to carefully review and evaluate the generated content to ensure its quality and relevance to your needs.

Radar and Infrasound Observations of the 2026 May 30 Cape Cod Bay Superbolide

The essentials

Question

Method

Findings

Limitations

Why it matters

Read further

Definitions

From a Bright Flash to a Possible Meteorite Strewn Field

Three Ways to Follow a Bolide

A Steep Track and a Radar Terminus

Where Might Fragments Have Fallen?

An Orbit Without a Clear Parent

Why Energy Estimates Differ

Ask questions about this paper to our AI assistant

Tools for this paper

Advanced tools Premium

Papers around this one

Closest papers

Go further

Cite this paper (BibTeX)