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As its name suggests, 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.

Case of Ferrette, on July 29, 2010:

Case number:



"Dédé", from the Haut-Rhin, reported to Swiss ufology group GREPI that on Thursday, July 29, 2010, there was a moderate storm with only three lightning.

Then at 01:15 a.m., he saw from his sofa a light like that of a plane, a flashing red light.

At 01:15 a.m., he wonders about it, because the light did not move after a brief observation. It was very high in the sky.

At 01:30 a.m., he decided to watch this light with binoculars. In the lenses, it appears round, a sort of ball or luminous circle, green and red in the center.

Around 1:30 a.m. to 2:00 a.m., he tried in vain to photograph it. The night, the distance, and his cell phone camera dis not allow success. The glowing still appeared to be motionless.

At 02:10 a.m., the object disappeared, but he had not seen or witnessed a starting movement.

"Dédé" would not like to draw hasty conclusion, but finds a helicopter or plane making an hour of hovering in the middle of the night improbable, a balloon at 01:15 a.m. is also unlikely to him.

He does not think that satellites can be seen with the naked eye if they are not currently burning on reentry in the atmosphere.

He wants to know what he saw; which remained a UFO to him, not necessarily alien, although he does not exclude that possibility.

In a listing by the ufology Association SPICA published around 2014, we discover a better location: it was in Ferrette.


Temporal data:

Date: July 29, 2010
Time: 01:15 a.m.
Duration: 55 minutes.
First known report date: 2014
Reporting delay: Days, 4 years.

Geographical data:

Department: Haut-Rhin
City: Ferrette
Place: From the sofa, UFO in the sky.
Latitude: 47.494
Longitude: 7.315
Uncertainty ratio: 2 km

Witnesses data:

Number of alleged witnesses: 1
Number of known witnesses: 1
Number of named witnesses: 0
Witness(es) ages: ?
Witness(es) types: Male.

Ufology data:

Reporting channel: By the web to the Swiss ufology group GREPI.
Type of location: ?
Visibility conditions: Night.
UFO observed: Yes
UFO arrival observed: ?
UFO departure observed: Yes
Entities: No
Photographs: Attempted in vain.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: Puzzled.
Witnesses interpretation: Helicopter, plane, balloon, satellite unlikely.


Hynek: NL
ALSACAT: Insufficient information.



Thursday, July 29, 2010.

A storm, only three flashes, the weather is not really stormy.

01:15: I see from my couch a light such as that of an airplane (red flashing).

01:30: Thinking. The light does not move after a brief observation. It is very high in the sky.

01:30: I decided to watch this light with binoculars: appearance in the lens of a round (kind of ball or circle of light) green and red in the center.

01h30-02h00: vain attempt to take a picture of the object, because of the night and the lack of resources (mobile phone camera) and by its distance. The luminescent object still does not seem to move.

02:10: Disappearance of the object in question (I did not observe a starting motion).

Without drawing any conclusions in haste:

-helicopter: one hour from a standstill in the night

-balloon: scarcity in the region, and 1:15 am

-airplane: the standstill is usually reserved for a few military vehicles that leave a large trail in the sky.

-satellite: despite the height, I do not think these can be seen with the naked eye without flaming entry into Earth's atmosphere.

I'd like to know what it can be. To me it is a UFO (not necessarily alien, although I do not exclude that theory. Please stay down to earth).

Dédé (Haut-Rhin – France)


City Date and hour of observation General shape
General color
FERRETTE Thursday 29 July 2010 at 01:15 Circular, round or disc (2D)
Unsolved -lack of info


Geostationary satellites are faintly visible at the beginning and end of the night, but are invisible at the hours reported here. And they are neither red nor flashing.

A non-geostationary satellite is obviously excluded because of the observation duration.

(I add, because I already read such proposals by amateurs on forums: it was not a pulsar, because no pulsar is visible to the naked eye or even binoculars, and variable star can not be the reason of the flashing because their variability is measured in years.)

Helicopters, balloons, airplanes seem equally improbable; I do share the arguments of the witness. Small toy balloons, weather balloons and party balloons might appear flashing red, but only if the sun stills lights them, at these hours it does not seem to me. The duration enough is against such explanations, it would require a totally windless sky for nearly an hour; which seems unlikely to me.

Mars, often called "red", was not visible from there at that time. And it never flashes.

However, there are gaps and uncertainties in the report.

Firstly, there is no elevation angle. "Dede says "Very high in the sky". But can I deduce a high angle, or was it actually close to the horizon, the "height" being a very subjective impression? If it was low enough, it could have been a star. Some stars like Sirius, Betelgeuse and Antares not only look reddish, but seem to flash when close to the horizon or when the air trembles (although Sirius is not really red anymore since centuries).

I would have had a weakness for Sirius. Its high brightness is due to its proximity, only 8.6 light years away, it is the brightest star in the night sky. Its flashing had already ben called impressive by witnesses, it occurs because Sirius never rises very high on the southern horizon as seen from Alsace. The light passes through a greater thickness of atmosphere than if it were at a high elevation. The refraction of the atmosphere can make it appear to flash, and make its color fluctuate.

But Sirius was not visible at that time in that place. Betelgeuse neither. Another star perhaps? How could I say, since the viewing direction is not given?


Insufficient information.

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 July 24, 2015 Creation, [gr1], [sp4].
1.0 Patrick Gross July 24, 2015 First published.

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This page was last updated on July 24, 2015