17 June 2012, about 04:00 local; approximately 15 seconds
Outcome: Open (Unresolved). GEIPAN retained D1 after analysing weather, the reported formation and possible aircraft or windborne objects. No identification was established. The one-witness account and unmeasured distance make the published size and speed estimates conditional.
A formation above the garden
A Lambersart resident who had woken early went into the garden to let a cat out and watch the sky. At about 04:00 on 17 June 2012, a formation moving from south to north initially suggested a flock of ducks. As it approached almost overhead, the observer described ten to fifteen transparent, bubble-like spheres in an orderly arrangement, apparently layered in depth.
The reported passage lasted about fifteen seconds. There was no associated noise. The formation disappeared towards a white cloud, and the witness continued watching for roughly an hour without seeing a repeat. The report reached GEIPAN in September; the investigation was written up in November 2013.
What the investigation could check
The investigator compared the account with observations from Lille-Lesquin airport, around ten kilometres away. Weather records indicated good visibility, scattered cloud and a light south-westerly wind. The astronomical review described the approaching dawn rather than a visible planet matching the event. No particular recorded aircraft or satellite supplied an identification in the database checks described.
One detail was internally uncertain: the witness described illumination on the left side of the spheres, while the investigator noted that illumination from the approaching dawn would be expected on the other side. This correction belongs in the account rather than being smoothed out into an exact reconstruction.
Why the large dimensions are not measurements
GEIPAN explored what followed if the forms really entered a cloud at a height inferred from the nearby weather observations. Combining that assumption with an apparent size comparable to a euro coin at arm’s length produced diameters around 49–68 metres. Those figures are model outputs, not independently measured objects.
The same applies to the speed calculations. Different assumed angular paths and cloud heights gave markedly different results. There was no range measurement or timed camera record to establish the geometry. A much closer formation, inaccurate angular estimates or misjudged cloud overlap would alter the calculation substantially.
Wind and aircraft hypotheses
The report did not completely exclude windborne objects: the reported direction was only around 45 degrees from the measured wind direction. It nevertheless regarded the described symmetry, apparent organisation and geometry as a poor overall match. Formation aircraft offered some compatibility with the calculated motion, but not the transparent appearance and silence as described.
These comparisons are an investigation of testimony, not a physical test of the purported spheres. The claimed transparency and organisation depend on one brief visual account, without a photograph or a second observer.
Why the outcome remains Open
The official report concluded D1: an investigated observation left unidentified. UKPX therefore records Open (Unresolved), retaining the source’s explicit limits. The classification does not turn the calculated dimensions into established facts or establish an unusual origin.
The present official catalogue still lists the case within its D group. The later archive update is separate from the June 2012 incident and the November 2013 investigation date.
Location and map reference
Lambersart, Nord, France. Broad official commune centre, not the private garden or witness address.
Sources and review
Original GEIPAN investigation report. Original investigation report, all ten pages, especially the narrative on page 2, environmental checks on pages 3–4, conditional calculations on pages 6–9 and D1 conclusion on page 10. Sources and classification checked 13 November 2026.