Cheyenne, WyomingJuly 1957

Insufficient Data

Summary

On July 16, 1957, at 11:57 a.m. local time, a civilian in Cheyenne, Wyoming reported seeing unusual vapor trails. The observation lasted about five minutes. The sky had scattered to broken clouds in two layers.

The witness saw a vapor trail arc form near the zenith. The trail was very faint and narrow. It made a full 180 degree turn and formed in about twelve seconds, with no aircraft or object visible. Cross shaped patterns developed at right angles to the arc as the trail formed. Within about half a minute, a second trail developed moving from west to east in a straight line.

The Air Force record (Project 10073, its official file for unidentified flying object reports) found nothing unusual. The comment notes such trails are often seen with a plane that is not visible because of high altitude.

Reported location

Cheyenne, Wyoming

Date of incident

July 1957

State / country

WY / US

Page count

2 scanned pages

USAF evaluation

unknown

Microfilm

T1206, Roll 28

Original case file scans

Original case file · scanned by NARAPage 1 of 2

View transcribed text

. ,
1 PROJECT 10073 RECORD CARD
| | 1. DATE 2. LOCATION 112. CONCLUSIONS
4 0 Was Balloon
4 IE ily 1057 ah PS ERE Erp RG o Probably Bolleon
| 3. DATE-TIME GROUP 4. TYPE OF OBSERVATION SRY DI
Ee 1187 yam & ; O Wos Aircraft
Hl MESTEGEISINS Si Sh IY SNES 1 Pe 1 ASIEISRRES he = :
; Local 1 Ground-Visuol O Ground-Rader 0 Probobly Airerolr
= i ~ 1Qa87 H H
. CMT __t2/ 109¢ Z OQ Air-Visual 0 Air-Intercept Rodor O Possibly Aireraft
1 5. PHOTOS 8. SOURCE O Was Astronomical
FE i Q Yes 0 Probably Astronomical
E | Oe Civilian O Possibly Astronomical
i 7. LENGTH OF OBSERYATION | 8. NUMBER OF OBJECTS | 9. COURSE Bo Oran tyral ta.
- O [Insufficiant Dota for Eveluation
2 : ; % O Unknown
; 5 minutes one W to E
_ 110. BRIEF SUMMARY OF SIGHTING jo COMMENTS
Vapor trail arc developed as a very Nothing unusual apout this;
4 faint & narrow trail, Pattern showed trails often seen with plane
3 a full 180 dgr turn & formed in about | not visible due to high altitude,
4 12 seconds. No obj visible. Crosses .
2 | developed progressively with formation :
E I ‘OF the trail, Within 1/2 mile a
i | second trail developed moving W to E
2 | in a straight line, f
| |
= |]
: {
a. |
3 ATIC FORM 329 (REV 26 SEP 52)
E 32 : . Pp
CR RR RR RRR RRR EEE EERE,

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Source: National Archives Catalog · NAID 28970526