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How Boumdeid's UFO Became a Meteorite

The 2011 Boumdeid fireball became identifiable because witnesses, recovered material and laboratory work all pointed to a meteorite.

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On this page

  • The Night of the Fireball
  • From Witness Reports to Trajectory
  • Recovery and Scientific Classification
Preview for How Boumdeid's UFO Became a Meteorite

Introduction

The September 2011 Boumdeid fireball is the strongest documented example in Mauritania of an object that was initially unidentified but was subsequently explained through physical evidence. Unlike many reported UFO incidents, this event did not remain dependent on eyewitness testimony alone. A recovered meteorite, laboratory analysis, and publication in the official Meteoritical Bulletin transformed what many observers first experienced as a mysterious object into a well-documented meteorite fall.[LPI]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

2011 Fall illustration 1

For researchers examining alleged UFO incidents in Mauritania, the Boumdeid case is valuable precisely because it demonstrates how an unexplained aerial event can move from speculation to scientific certainty. Rather than supporting claims of unidentified technology, the case illustrates the evidential process by which a spectacular atmospheric phenomenon became conclusively identified.

The Night of the Fireball

On the evening of 14 September 2011, at approximately 21:00 GMT, residents across parts of southern Mauritania witnessed an exceptionally bright fireball travelling across the sky. The object was seen by hundreds of people, particularly in the regions of Assaba and Gorgol, north and west of Kiffa.[Yadda]yadda.icm.edu.plYadda The meteorite fall near Boumdeid, Mauritania, fromThe meteorite fall near Boumdeid, Mauritania, from September 14, 2011 - Meteorites - Tom Vol. 3, No. 1-2 (2014) - BazTech - Yadda…Published: September 14, 2011

Witnesses consistently described several striking features:

  • an intensely luminous object crossing the sky;
  • increasing brightness before fragmentation;
  • one or more loud explosions;
  • sonic booms following the visible passage;
  • reports of hissing sounds during the final phase;
  • fragments apparently falling south of Boumdeid.

These characteristics are entirely consistent with a large meteoroid entering Earth’s atmosphere at high velocity. The delay between the visual event and the explosions matches the expected behaviour of sonic booms, which arrive after the light because sound travels much more slowly than light.[LPI]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

The explosions caused understandable alarm among local residents. Before any scientific investigation had begun, many witnesses simply knew that an extraordinarily bright object had crossed the sky and appeared to explode overhead.

From Witness Reports to a Reconstructed Trajectory

One reason the Boumdeid event became scientifically valuable is that investigators collected eyewitness information rapidly rather than relying on memories years later.

Researchers recorded numerous witness accounts and mapped observation locations using GPS. Because Mauritania lacked an all-sky fireball camera network, these human observations became the primary data source for reconstructing the object’s atmospheric path. Weather information, particularly upper-atmosphere wind data, was then incorporated to estimate the likely flight path and impact area.[Yadda]yadda.icm.edu.plYadda The meteorite fall near Boumdeid, Mauritania, fromThe meteorite fall near Boumdeid, Mauritania, from September 14, 2011 - Meteorites - Tom Vol. 3, No. 1-2 (2014) - BazTech - Yadda…Published: September 14, 2011

This approach demonstrated that useful trajectory reconstruction remains possible even in regions without sophisticated monitoring infrastructure. The Boumdeid investigation has since been cited as an example of post-event recovery methods in remote areas where instrument coverage is limited.[Yadda]yadda.icm.edu.plYadda The meteorite fall near Boumdeid, Mauritania, fromThe meteorite fall near Boumdeid, Mauritania, from September 14, 2011 - Meteorites - Tom Vol. 3, No. 1-2 (2014) - BazTech - Yadda…Published: September 14, 2011

Although the reconstructed trajectory could not achieve the precision available from dedicated fireball camera networks, the independent witness observations showed remarkable consistency regarding the direction of travel, fragmentation, and approximate fall location.

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The Recovery That Changed the Investigation

The decisive turning point came the following morning.

Witnesses had reported seeing a stone strike the ground, and a meteorite was recovered near Boumdeid shortly afterwards. Rather than relying solely on stories or photographs, investigators now possessed physical evidence that could be analysed in laboratories.[LPI]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

The recovered specimen weighed approximately 3.6 kilograms. It retained a fresh black fusion crust formed during atmospheric entry, while broken surfaces revealed visible chondrules—small spherical structures characteristic of many stony meteorites. Approximately 1.6 kg of the main mass was reportedly transferred to local authorities, while type specimens were preserved for scientific study.[LPI]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

The existence of a recovered stone fundamentally separates the Boumdeid incident from most UFO reports. Instead of asking what witnesses thought they had seen, investigators could examine the object itself.

Laboratory Proof That It Was a Meteorite

Laboratory examination produced several independent lines of evidence confirming that the recovered object was a freshly fallen meteorite.

Petrographic analysis revealed a strongly recrystallised ordinary chondrite of type L6, showing a brecciated internal texture. Mineralogical examination identified typical meteoritic minerals including:

  • olivine;
  • pyroxene;
  • kamacite;
  • taenite;
  • troilite;
  • chromite;
  • ilmenite.

The meteorite was classified as L6, shock stage S2, weathering grade W0. The W0 designation is especially important because it indicates essentially no terrestrial weathering, exactly what would be expected from a newly fallen meteorite rather than an older desert find.[LPI]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

Researchers also performed gamma-ray spectroscopy only 84 days after the fall. They detected short-lived cosmogenic radionuclides, including beryllium-7, cobalt-56, cobalt-58, and scandium-46, isotopes that decay relatively quickly after exposure to cosmic radiation ends. Their presence confirmed that the meteorite had entered Earth’s atmosphere only recently. Additional radionuclide measurements suggested a pre-atmospheric meteoroid radius of roughly 10–20 cm.[LPI]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

These laboratory results provided independent confirmation of the eyewitness accounts. Even if no witnesses had existed, the recovered stone itself demonstrated that a recent meteorite fall had occurred.

2011 Fall illustration 2

Official Scientific Recognition

Following laboratory analysis, the meteorite received formal approval from the Meteoritical Society under the official name Boumdeid (2011).

[meteoritical]meteoritical.orgSource details in endnotes. ical Bulletin records:

  • observed fall on 14 September 2011;[yadda.icm.edu.pl]yadda.icm.edu.plYadda The meteorite fall near Boumdeid, Mauritania, fromThe meteorite fall near Boumdeid, Mauritania, from September 14, 2011 - Meteorites - Tom Vol. 3, No. 1-2 (2014) - BazTech - Yadda…Published: September 14, 2011
  • location in Assaba, Mauritania;
  • classification as an ordinary chondrite (L6);
  • recovered mass of approximately 3.6 kg;
  • official approval in 2013.[LPI]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

This official recognition distinguishes Boumdeid from many claimed meteorite falls that never receive scientific verification. The classification followed internationally accepted procedures involving petrography, mineral chemistry, and documentation of the recovery.

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Why This Is Not Considered a UFO Case

From the perspective of UFO research, Boumdeid is notable because it demonstrates how unidentified observations can become identified through accumulating evidence.

Initially, observers encountered:

  • an unfamiliar bright object;
  • unusual sounds;
  • apparent fragmentation;
  • public uncertainty.

Those features alone could have supported numerous speculative explanations.

Instead, every major uncertainty was resolved through evidence:

Initial observationScientific explanationBright moving objectAtmospheric entry of a meteoroidExplosionFragmentation and sonic boomsFalling objectMeteorite impactUnknown materialLaboratory-confirmed L6 ordinary chondriteRecent eventConfirmed by short-lived cosmogenic radionuclides

Rather than leaving investigators with an unexplained phenomenon, the Boumdeid case became one of Mauritania’s best-documented natural astronomical events.[LPI]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

2011 Fall illustration 3

What the Boumdeid Fall Means for Mauritania’s UFO Record

Within Mauritania’s limited catalogue of reported unusual aerial phenomena, the Boumdeid fall serves as an important benchmark for evaluating evidence.

It demonstrates several principles relevant to later reports:

  • eyewitness testimony becomes much stronger when supported by physical evidence;
  • recovered material allows laboratory testing independent of witness interpretation;
  • multiple independent lines of evidence produce much greater certainty than visual reports alone;
  • spectacular atmospheric events can initially resemble unidentified objects but ultimately receive ordinary scientific explanations.

This is why the Boumdeid incident occupies a distinctive place within Mauritania’s record of unusual aerial observations. It began as a dramatic unidentified fireball witnessed across southern Mauritania but ended as one of the country’s most thoroughly documented meteorite falls, supported by eyewitness observations, trajectory reconstruction, physical recovery, mineralogical analysis, cosmogenic radionuclide measurements, and formal international classification.[usra.edu]lpi.usra.eduMeteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011…Published: September 14, 2011

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Endnotes

1. Source: lpi.usra.edu
Link:https://www.lpi.usra.edu/meteor/metbull.cfm?code=57167

Source snippet

Meteoritical Bulletin: Entry for Boumdeid (2011)September 14, 2011...

Published: September 14, 2011

2. Source: meteoritical.org
Link:https://meteoritical.org/publications/meteoritical-bulletin

3. Source: yadda.icm.edu.pl
Title: Yadda The meteorite fall near Boumdeid, Mauritania, from
Link:https://yadda.icm.edu.pl/baztech/element/bwmeta1.element.baztech-231b333e-b99e-48d4-a5d8-baf5606ee63e

Source snippet

The meteorite fall near Boumdeid, Mauritania, from September 14, 2011 - Meteorites - Tom Vol. 3, No. 1-2 (2014) - BazTech - Yadda...

Published: September 14, 2011

4. Source: meteorite-recon.com
Title: boumdeid 2011
Link:https://www.meteorite-recon.com/portfolio_page/boumdeid-2011

Source snippet

Boumdeid (2011) – Meteorite ReconOctober 2, 2015 — Meteorite Recon | Boumdeid (2011) Meteorite search expedtions into continental deserts...

Published: October 2, 2015

5. Source: lpi.usra.edu
Link:https://www.lpi.usra.edu/meteor/metbull.cfm?code=57168

6. Source: lpi.usra.edu
Link:https://www.lpi.usra.edu/meteor/metbull.cfm?ants=&browse=&categ=All&code=57168&country=All&falls=&lrec=150&map=ge&mblist=All&nwas=&phot=no&pnt=Normal+table&rect=&sea=L6&sfor=types&snew=0&srt=&strewn=no&stype=exact&valids=

Additional References

7. Source: onlinelibrary.wiley.com
Title: In addition to four meteorites that were not ana
Link:https://onlinelibrary.wiley.com/doi/full/10.1111/maps.13427

Source snippet

activities in recent chondrite falls determined by gamma‐ray spectrometry: Implications for terrestrial age estimates - Rosén - 2020 - Me...

8. Source: researchgate.net
Title: Research Gate(PDF) THE METEORITE FALL NEAR BOUMDEID, MAURITANIA, FROM
Link:https://www.researchgate.net/publication/273203779_THE_METEORITE_FALL_NEAR_BOUMDEID_MAURITANIA_FROM_SEPTEMBER

Source snippet

ResearchGate(PDF) THE METEORITE FALL NEAR BOUMDEID, MAURITANIA, FROM SEPTEMBER 14, 2011...

Published: September 14, 2011

9. Source: youtube.com
Title: They Built a Network to Catch Meteorites — And Trace Their Origins
Link:https://www.youtube.com/watch?v=_hpS1W3CiOs

Source snippet

The Giant Eye of the Sahara: Unlocking the Mysteries of the Richat Structure...

10. Source: karmaka.de
Link:https://karmaka.de/?p=3930

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The meteorite fall near Boumdeid, Mauritania, from September 14, 2011February 28, 2015 — THE METEORITE FALL NEAR BOUMDEID, MAURITANIA, FR...

Published: September 14, 2011

11. Source: onlinelibrary.wiley.com
Link:https://onlinelibrary.wiley.com/doi/abs/10.1111/maps.12491

Source snippet

102 - Ruzicka - 2015 - Meteoritics & Planetary Science - Wiley Online LibraryAugust 19, 2015 — Search for more papers by this author Alex...

Published: August 19, 2015

12. Source: researchgate.net
Link:https://www.researchgate.net/figure/Values-and-probable-ranges-of-the-Boumdeid-fall-scenario-parameters_tbl1_273203779

13. Source: youtube.com
Title: Guelb er Richat Mauritania
Link:https://www.youtube.com/watch?v=SAN_HAUrpes

Source snippet

They Built a Network to Catch Meteorites — And Trace Their Origins...

14. Source: astronomy.activeboard.com
Link:https://astronomy.activeboard.com/forum.spark?aBID=58381&commentID=62646894&p=83&topicID=54959742

Source snippet

14, 2016 — Boumdeid meteorite 2011 Blobrana (L) 2016-09-14 01:41:11 RE: Boumdeid meteorite 2011...

Published: September 14, 2016

15. Source: youtube.com
Title: The 100 Meter Meteorite That Just Disappeared | Fer de Dieu of Chinguetti
Link:https://www.youtube.com/watch?v=YNDOAd0KBCU

Source snippet

Chinguetti Meteorite...

16. Source: researchgate.net
Title: (PDF) 14C and 14C‐10Be terrestrial age dating system for meteorites
Link:https://www.researchgate.net/publication/37793108814C_and_14C-10Be_terrestrial_age_dating_system_for_meteorites-_New_data_for_four_recently_fallen_meteorites?_tp=eyJjb250ZXh0Ijp7InBhZ2UiOiJzY2llbnRpZmljQ29udHJpYnV0aW9ucyIsInByZXZpb3VzUGFnZSI6bnVsbCwic3ViUGFnZSI6bnVsbH19