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ALSACAT is my comprehensive catalog of UFO sighting reports in Alsace, the region is the North-East of France, whether they are "explained" or "unexplained".

The ALSACAT catalog is made of case files with a case number, summary, quantitative information (date, location, number of witnesses...), classifications, all sources mentioning the case with their references, a discussion of the case in order to evaluate its causes, and a history of the changes made to the file. A general index and thematic sub-catalogs give access to these Alsatian case files.

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Case of Masevaux, on November 26, 2010:

Case number:



Someone reported by email to the Swiss ufology group GREPI that during the lighting of the Christmas lights in Masevaux on November 26, 2010, at about 9 p.m., he had taken between two other shots a picture showing a "light in the sky that was heading to the Euroairport (Basel-Mulhouse Airport)."

He estimates that the radar of the Grand Ballon had to detect it, if there was something.

He said his camera was a Canon Eos 500d in pause-night mode and mounted on a tripod with a Star Cokin filter.

He said he indicated the anomaly in the picture with an arrow he added; unfortunately the image disappeared from the web.


Temporal data:

Date: November 26, 2010
Time: ~09:00 p.m.
Duration: ?
First known report date: 2014
Reporting delay: Day, 4 years.

Geographical data:

Department: Haut-Rhin
City: Masevaux
Place: ?
Latitude: 47.774
Longitude: 6.997
Uncertainty ratio: 2 km

Witnesses data:

Number of alleged witnesses: 1
Number of known witnesses: 1
Number of named witnesses: 0
Witness(es) ages: Young adult, adult or aged.
Witness(es) types: ?

Ufology data:

Reporting channel: By email to the Swiss ufology group GREPI.
Type of location: ?
Visibility conditions: Night.
UFO observed: No
UFO arrival observed: N/A
UFO departure observed: N/A
Entities: No
Photographs: Yes.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: Puzzled.
Witnesses interpretation: ?


ALSACAT: Possible plane.



During the lighting of Christmas lights in Masevaux in Alsace on November 26, 2010 at about 9 pm, I was surprised to see while taking 2 shots between the two shots there was a light in the sky that was heading to the Euroairport (Basel-Mulhouse Airport).

The radar that controls the traffic zone is installed in the Grand Ballon (above Guebwiller, 1428meters altitude) and controls all air traffic in eastern France to the chain of the Alps and up to the Mont Blanc, Strasbourg and beyond to the north.

If this radar saw something unusual on that date it could not miss the object.

It was at the end of the first round of snowfall and the next snow phase started six hours later.

The camera was a Canon Eos 500d in night-pause mode on a tripod and equipped with a cokin star filter.

The anomaly in the picture is underlined by the presence of an arrow I added by the image processing software.

Unfortunately, the published image; which was at seems to be unavailable...



It goes without saying that without the image, I can not say much: plane? reflection? streetlamp? headlight? ...

I want to point out however that it is curious to say the direction it moved to from a photo as a photo cannot give real indication of movement.

Moreover, the radar set of the Grand Ballon takes care of planes equipped with transponders, not of any craft that would not have a transponder.


Possible plane.

Sources references:

* = Source is available to me.
? = Source I am told about but could not get so far. Help needed.

File history:


Main author: Patrick Gross
Contributors: None
Reviewers: None
Editor: Patrick Gross

Changes history:

Version: Create/changed by: Date: Description:
0.1 Patrick Gross August 31, 2015 Creation, [gri1].
1.0 Patrick Gross August 31, 2015 First published.

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This page was last updated on August 31, 2015.