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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 Strasbourg, on February 17, 2023:

Case number:



In the 1970s, Mrs. Gueudeulot, archivist of the French ufology magazine Lumières Dans La Nuit, noted observation reports transmitted by the magazine's correspondents. This archive surfaced in the 2020s through the work of the "Sceau" association, which is dedicated to the preservation of ufological archives.

Among the apparently unpublished cases found in there, is an observation of February 17, 1977, in Strasbourg, originating from a letter of May 11, 1975 by the witness, Mrs. Gaillard.

From 6:30 p.m. to 6:37 p.m., she wrote, she observed a blue glow, like a star at a certain distance from Venus, which approached the latter in 7 minutes, to touch it (in appearance). Clouds then hid Venus while the blue glow was still visible.


Temporal data:

Date: February 17, 2023
Time: 06:30 p.m.
Duration: 7 minutes.
First known report date: May 11, 1975.
Reporting delay: 3 months.

Geographical data:

Department: Haut-Rhin
City: Strasbourg
Place: ?
Latitude: 48.574
Longitude: 7.751
Uncertainty radius: 4 km.

Witnesses data:

Number of alleged witnesses: 1
Number of known witnesses: 1
Number of named witnesses: 0
Witness(es) ages: Adult or aged.
Witness(es) types: Woman.

Ufology data:

Reporting channel: Letter from witness to ufology magazine LDLN.
Type of location: ?
Visibility conditions: Night.
UFO observed: Yes.
UFO arrival observed: ?
UFO departure observed: ?
Entities: No.
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: ?
Witnesses interpretation: ?


Hynek: NL
ALSACAT: Possible Venus.




FEBRUARY 17, 1975.-


Hour: from 06:30 p.m. to 06:37 p.m.

Mrs. GAILLARD observed a blue glow, like a star at a certain distance from Venus, which approached the latter in 7 minutes, touching it (in apparence). Clouds then hid Venus and the blue glow was still visible.

(By letter of May II, 1975).



Venus was at the time and place of the sighting at the azimuth of 246°, and the elevation of 14°.

Just above and to his right was Jupiter.


I then thought that the "blue glow" would have been Venus, which sometimes appears white, sometimes bluish, and Jupiter which is never bluish but always orange, would have been taken for Venus. For this to happen, Ms. Gaillard must not be used to observing the planets, which is possible.

On the other hand, there is a problem: the two planets are very close, and remain very close. There is no percetible approach of one to the other during the 7 minutes of observation, a perceptible rapprochement occurring only around 11:00 p.m.

For Venus: Magnitude -4.1 (91.17% of the surface is illuminated).

For Jupiter: Magnitude -2.1 (99.83% of the surface is illuminated).

There is also little chance that an arriving cloud would have hidden one without hiding the other very soon as well.

So I don't have a sure explanation, but it is very, very odd that Mme Gaillard mentioned Venus, but not Jupiter which is right next to it and also clearly visible.


Possible Venus.

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 September 12, 2023 Creation, [ald1].
1.0 Patrick Gross September 12, 2023 First published.

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This page was last updated on September 12, 2023.