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ALSACAT:

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 Strasbourg, on August 20, 2009:

Case number:

ALSACAT-2009-08-20-STRASBOURG-1

Summary:

The SPICA Alsatian ufology association published on the web and in their bulletin for January 2010, that someone had reported a UFO sighting in Strasbourg, of August 20, 2009, at an exact time that the person does not know but which was between 10:30 p.m. and 11:30 p.m.

The person said that in the clear sky that night, from his window in Strasbourg overlooking the west, he/she had, although in town, an acceptable view of the main stars.

He/she suddenly saw two bright spots emitting "flashes" in recurring ways at a frequency of the order of 1 flash every 1 to 2 seconds. Being used to see the planes approaching the Entzheim airport at this place, the person notes that the two dots were clearly higher in the sky, and, strangely enough, they moved in a zigzag, by round trips without any coherence.

It seemed to him/her that the distance traveled in these trips and returns was much greater than that between the traffic lights at the wingtips of a distant plane.

During 7 to 10 minutes, the two dots moved towards the south, he/she located them somewhere between Strasbourg and the Vosges. After disappearing from his field of vision for 5 minutes, the dots reappeared, moving this time to the north. During this move, one of the two points dots ceased to flash to stay fully lit, with a yellow light. At this point, the two dots went north following a linear trajectory, as if the lit dot was trying to catch up with the one that was blinking.

The witness reports that there was "no hallucinatory speed to note" and that "if there had not been the incoherent zigzag movement, the displacement was comparable in terms of speed to what one sees with conventional airliners."

Data:

Temporal data:

Date: August 20, 2009
Time: Between 10:30 p.m. and 11:30 p.m.
Duration: 7 to 10 minutes.
First known report date: January 2010
Reporting delay: Day, 5 months.

Geographical data:

Department: Bas-Rhin
City: Strasbourg
Place: From home window in the city, UFO in the sky.
Latitude: 48.580
Longitude: 7.740
Uncertainty ratio: 5 km

Witnesses data:

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

Ufology data:

Reporting channel: On the Web.
Type of location: From home window in city, UFO in the sky.
Visibility conditions: Night
UFO observed: Yes
UFO arrival observed: No
UFO departure observed: ?
Entities: No
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: Puzzled.
Witnesses interpretation: Not planes.

Classifications:

Hynek: NL
ALSACAT: Possible satellites.

Sources:

[Ref. sp5:] "SPICA" UFOLOGY ASSOCIATION:

Strasbourg (67) 08/20/2009

Source: SPICA Forum

Title: Ufo Strasbourg August 20, 2009

Message: Hello everyone, The evening of Thursday, August 20, 2009 between 10:30 p.m. and 10:30 p.m. (I do not have the exact time unfortunately) I was able to see 1 strange phenomenon in the Alsatian sky. That night the sky was very clear and from my Strasbourg window overlooking the west I had an acceptable view (for a city) on the main stars. Suddenly I saw two bright spots emitting flashes in a recurring manners [sic] at a frequency of the order of 1 flash every 1 to 2 seconds. I usually see flying planes approaching Entzheim at this place, but these 2 points were significantly higher in the sky and extremely strange they moved in zigzag, to go back and forth without any coherence. Thus from one flash to another their position could vary from one go to one return where a plane moves linearly. It seemed to me that the gap between the round trips was quite important, in all cases much more than the flashes of 2 wings signaling on a distant plane. During 7-10 min. the 2 points moved south, I would situate them somewhere between Strasbourg and the Vosges. After disappearing from my field of vision for 5 minutes, they reappeared, this time moving north. During this move, one of the two points stopped issuing flashes to stay fully lit - yellow light. At that moment the 2 points went to the north following a linear trajectory... one would have thought that the lit point tried during all the maneuvers to catch the one that flashed. Last detail, there was no hallucinating speed to note... if there had not been the incoherent movement in zigzag, the displacement was comparable in terms of speed to what we see with classics airliners. If someone saw the same thing, give me your point of view.

Thank you

[Ref. sp1:] "SPICA" UFOLOGY ASSOCIATION:

Strasbourg (67) 20 août 2009 entre 22h30 et 23h30 Source : Forum SPICA

Hello everyone, The evening of Thursday, August 20, 2009 between 10:30 p.m. and 10:30 p.m. (I do not have the exact time unfortunately) I was able to see 1 strange phenomenon in the Alsatian sky. That night the sky was very clear and from my Strasbourg window overlooking the west I had an acceptable view (for a city) on the main stars. Suddenly I saw two bright spots emitting flashes in a recurring manners [sic] at a frequency of the order of 1 flash every 1 to 2 seconds. I usually see flying planes approaching Entzheim at this place, but these 2 points were significantly higher in the sky and extremely strange they moved in zigzag, to go back and forth without any coherence. Thus from one flash to another their position could vary from one go to one return where a plane moves linearly. It seemed to me that the gap between the round trips was quite important, in all cases much more than the flashes of 2 wings signaling on a distant plane. During 7-10 min. the 2 points moved south, I would situate them somewhere between Strasbourg and the Vosges. After disappearing from my field of vision for 5 minutes, they reappeared, this time moving north. During this move, one of the two points stopped issuing flashes to stay fully lit - yellow light. At that moment the 2 points went to the north following a linear trajectory... one would have thought that the lit point tried during all the maneuvers to catch the one that flashed. Last detail, there was no hallucinating speed to note... if there had not been the incoherent movement in zigzag, the displacement was comparable in terms of speed to what we see with classics airliners. If someone saw the same thing, give me your point of view.

[Ref. rn1:] "RESEAU NATIONAL CIVIL DE SURVEILLANCE DU CIEL":

20/08/2009 - 22h30 - Bas-Rhin (67) - 2 points lumineux

De: Forum SPICA

Source: http://www.spica.org/faq.php?lng=fr&pg=&id=3

Citation:

Hello everyone, The evening of Thursday, August 20, 2009 between 10:30 p.m. and 10:30 p.m. (I do not have the exact time unfortunately) I was able to see 1 strange phenomenon in the Alsatian sky. That night the sky was very clear and from my Strasbourg window overlooking the west I had an acceptable view (for a city) on the main stars. Suddenly I saw two bright spots emitting flashes in a recurring manners [sic] at a frequency of the order of 1 flash every 1 to 2 seconds. I usually see flying planes approaching Entzheim at this place, but these 2 points were significantly higher in the sky and extremely strange they moved in zigzag, to go back and forth without any coherence. Thus from one flash to another their position could vary from one go to one return where a plane moves linearly. It seemed to me that the gap between the round trips was quite important, in all cases much more than the flashes of 2 wings signaling on a distant plane. During 7-10 min. the 2 points moved south, I would situate them somewhere between Strasbourg and the Vosges. After disappearing from my field of vision for 5 minutes, they reappeared, this time moving north. During this move, one of the two points stopped issuing flashes to stay fully lit - yellow light. At that moment the 2 points went to the north following a linear trajectory... one would have thought that the lit point tried during all the maneuvers to catch the one that flashed. Last detail, there was no hallucinating speed to note... if there had not been the incoherent movement in zigzag, the displacement was comparable in terms of speed to what we see with classics airliners. If someone saw the same thing, give me your point of view.

Thank youi

[Ref. sp4:] SPICA UFOLOGY GROUP:

City Date and hour of observation General shape
Identification
General color
Hypothesis
Conclusion
STRASBOURG Thursday 20 August 2009 at 10:30 p.m. luminous dot
Unidentified
white
None
Unsolved -lack of info

Discussion:

I cannot give a definite explanation. However, some remarks can be made.

The zigzag appearance of the movement may be due to a natural atmosphere shake. This well-known and not too rare phenomenon can give a zigzag movement appearance to satellites.

The apparent change of direction can be explained as well. Sometimes satellites intersect. If it happens that they are no longer visible from a point of their trajectory, because they pass in the shadow of the earth for example, one can have the impression of satellite literally making a U-turn I did observe this once myself.

Here, it even happens that the "dots" disappeared from the witness's vision during 5 minutes; it is therefore not at all sure that the same "dots" came back, it could have been others.

Since there is no precise hour, it is of little use to check which satellites might have been seen. In one hour, the candidates are quite numerous.

Evaluation:

Possible satellites.

Sources references:

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

File history:

Authoring:

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

Changes history:

Version: Create/changed by: Date: Description:
0.1 Patrick Gross February 12, 2018 Creation, [sp5], [sp1], [rn1], [sp4].
1.0 Patrick Gross February 12, 2018 First published.

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This page was last updated on February 12, 2018.