18 June 2024, approximately 22:30–23:00 local · Rennes and Cesson-Sévigné, Ille-et-Vilaine, France
A filmed sphere with spikes and a downward flame was identified as an unusual paper hot-air balloon. Investigators found a matching design, but its creators denied launching one that evening.
A shape that resisted the first guess
On 18 June 2024, a traveller returning towards Rennes noticed a strange object near Cesson-Sévigné. At first an aircraft or ordinary balloon seemed possible. The account then described something more distinctive: a dark rounded body, projections around it and an orange flame underneath. The witness continued watching after reaching home and obtained a short camera recording. GEIPAN received the questionnaire and video two days later.
This is a case in which the description’s unusual details became useful clues. Calling the object a sphere alone loses the very features that investigators needed to compare. The flame and outline deserved to be tested together rather than treated as separate anomalies.
What the investigation established
GEIPAN’s report compared the footage with decorative paper hot-air balloons. It found a close design match associated with Les semeurs d’étoiles, and AROME wind data agreed with the slow drift. The association confirmed that the shape resembled its creations but said it had made no release at the relevant time. Its festival had taken place two days earlier. The report therefore proposed a reproduction of the design released by someone else, not a proven launch by that association. GEIPAN classified the observation A: identified as a paper hot-air balloon.
The distinction matters. A visual match can support identification of an object type without identifying its owner. The festival connection is part of the investigators’ search, not an established chain of custody from a particular workshop to this flight. The article preserves that boundary rather than accusing the named creators of a release they denied.
The strength and limit of the resolution
A recording allows comparison of outline and movement that a remembered description cannot. Weather reconstruction adds another independent kind of test. Taken together, those are more informative than the initial impression of a silent, unfamiliar object. They still do not amount to recovering the balloon or interviewing its launcher.
The published investigation is dated December 2024 and the online case was updated in February 2025. Those are investigation and publication dates; the sighting belongs in June 2024. UKPX has read the report and is reporting GEIPAN’s identification, not claiming to have repeated its weather reconstruction or examined the original camera file. The location photograph supplies geographical context only.
Sources and record notes
GEIPAN investigation, 11 pages, dated 18 December 2024.
Map reference: Broad Rennes locality reference from the contextual photograph’s checked coordinates. The observation began while driving near Cesson-Sévigné and continued near home; this pin does not locate the private residence, launch point or balloon. Coordinate source.
Sources checked 11 November 2026. Reported appearance tags describe the account, not a verified explanation.