Derby, ColoradoSeptember 1958

Unidentified

Summary

Between September 18 and October 20, 1958, a civilian in Derby, Colorado, took a 35mm color slide of a B-47 vapor trail in a southwest direction from his home. When he later projected the slide, he noticed a red dot in the picture that he had not seen when taking it. He recalled taking the photo in the evening and said there were no other aircraft in the air. In November 1958 he gave the slide to Air Force investigators for examination.

The Air Force photo lab at the Air Technical Intelligence Center analyzed the slide. They found the red dot was a perforation of one or two layers of the film emulsion. When the slide was held at an angle to a light source, a small rise with a pit at the center could be seen. The Air Force conclusion on the Project 10073 record card was that the red dot was a flaw in the film, not an object. Project 10073 was the Air Force's official record for unidentified flying object reports.

Reported location

Derby, Colorado

Date of incident

September 1958

State / country

CO / US

Page count

5 scanned pages

USAF evaluation

unidentified

Microfilm

T1206, Roll 34

Original case file scans

Original case file · scanned by NARAPage 1 of 5

View transcribed text

- po ey co - n— . - TD PRE TRA EA RATE Ng Pog rire _ Tr ee —— re rr — ;
|
4 PROJECT 10073 RECORD CARD |
1. DATE 2. LOCATION 12. CONCLUSIONS
i \ it ders ; O Was Balloon |
. Sep ~ 20 Oct 5& Lerny, Colorado O Probably Balloon
). DATE-TIME GROUP 4 TYPE OF OBSERVATION O Possibly Ballaan
; wa B O Was Aircraft
; ra me ve pe 38: Ground- Visual oO Ground Rodor a Probably Aircraft
EE le) EEE A LER QO Air Visual 0 Air-Intercept Radar O Possibly Aircraft
3. PHOTOS » SOURCE - |O Was Astronomical
; Yes O Probably Astronomical
% Q No Civilian OD Possibly Astronomical |
{ 7. LENGTH OF.OBSERVATION 8. NUMBER OF OBJECTS | 9. COURSE D Othe rel freee l
: DO Insufficient Deto for Evaluation
X "tA 0 O Unknown
: SRR OC n/E
y 19. BRIEF SUMMARY OF SIGHTING 11. COMMENTS
cwoto taken of B-47 vapor trail roveolled Red doc was determined to he
; | rod dot which was not soticed when a perioration of one oir two
; [. foLdre was taunan, layers of smulsion,
; |
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; ATIC FORM 329 (REV 26 SEP 52)
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Source: National Archives Catalog · NAID 28979916