Declassified UFO / UAP Document
Stockholms Observatorium Analysis of July 9-11 Observations
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The Stockholm Observatory analyzes reports of aerial phenomena from July 9-11, concluding they are likely bright meteors. The author explains the optical illusion of angular velocity that leads observers to misidentify meteors as projectiles.
This document, issued by the Stockholm Observatory in Saltsjöbaden, provides an analytical assessment of reported aerial phenomena observed between July 9 and July 11. The author, Yngve Öhman, addresses the difficulty of reconciling multiple reports of a single object. He explains that the angular velocity of a meteor at an altitude of 2 miles traveling at 20 km/sec is identical to that of a projectile at 200 meters altitude traveling at 200 m/sec, which explains why observers might perceive these phenomena in a similar manner. Öhman argues that it is impossible for a single projectile to have been observed from such a large portion of the country while maintaining the same speed and height as a fireball. He further notes that attempts to explain the observations as a large number of simultaneous projectiles are problematic due to inconsistencies in time and direction. Regarding reports from July 10 and 11, the author suggests that some observers may have misidentified the date and were actually referring to the July 9 event. He concludes that other observations differ from the primary case, though some share similar descriptions. Ultimately, he recommends that for future statistical treatment of the material, all observations made between 14:00 and 15:00 on July 9, 10, and 11 should be excluded, as he believes they are highly likely to be bright meteors.
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Official Assessment
The observations from 14:00 to 15:00 on July 9, 10, and 11 are likely bright meteors.
The author concludes that the reported phenomena are likely bright meteors, noting that observers often confuse the angular velocity of high-altitude meteors with lower-altitude projectiles. He suggests that reports from July 10 and 11 may involve date errors by observers, and recommends excluding observations between 14:00 and 15:00 from further statistical analysis.