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Project Blue Book Special Report (second copy)

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This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.

Open the PDF at page 44 Original source ↗

“meteor”15 pages

  • p. 9 …for as misinterpretations of known objects (suchas meteors, balloons, or aircraft), a few as the result…
  • p. 19 …Balloons, aircraft, astronomical bodies (such as meteors), birds, and clouds or dust were recognized as major…
  • p. 44 …mph More than 4 0 0 mph Meteor-like Not stated Unknown Per Cent 15 20…
  • p. 46 …i r 00 Elliptical Rocket and aircraft Meteor or comet Lenticular, conical or teardrop Flame Other…
  • p. 72 …434 434 Shape Elliptical Rocket and aircraft Meteor or comet Teardrop, lenticular, or conical Flame Other…
  • p. 74 …100 to 400 mph Over 400 mph Meteor-like Not stated 249 154 181 403'" 8…
  • p. 76 …There is a higher percentage of KNOWNS in the flame and in the meteor- or comet…
  • p. 80 …OF SHAPE Shape Elliptical Rocket or aircraft Meteor or comet Flame T e a r d…
  • p. 82 TABLE XII Speed Stationary Less than 100 mph 100 to 400 mph Over 400 mph Meteor…
  • p. 84 …The second was slightly increased by the removal of the astro- nomical sightings from the meteor…
  • p. 108 …Evaluation of All Sightings for All Years by Shape of Object, Meteor or Comet . . . . . . . 190 Table…
  • p. 109 …Evalua^on of Unit Sightings for All Years by Shape of Object, Meteor or Comet 194…
  • p. 110 …Evaluation of Object Sightings for All Years by Reported Speeds of Objects, Meteor-Like Speeds 209…
  • p. 291 …Meteor like Not stated Other CODE X Y 0 1 2 3 4 5 6 7…
  • p. 302 …100 - UOO mph More than iiOO mph Meteor-like Not stated Other CODE 63 SHAPE X…
O»
Total Less Unknown
Per Cent
40 35 30 25 20 15 10
i i i i i i i 5 0 0 5 10
Stationary
Less than
100 mph
100 to 400
mph
More than
4 0 0 mph
Meteor-like
Not stated
Unknown
Per Cent
15 20 25 30 35 40
I I I I I L_
FIGURE 20 COMPARISON OF KNOWN AND UNKNOWN OBJECT SIGHTINGS BY SPEED, 1947-1952
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Report, cited by the archive. The PDF is mirrored here; the original link is under it. 309 pages are in the text index: search them above, or from the library's search.