25 Miles West Of Denver, Colo Bergen Park, Colorad, December 1955December 1955

Insufficient Data

Summary

On December 31, 1955, two people saw a strange object about 25 miles west of Denver, Colorado, near Bergen Park. The Greenwich time was 1805Z. The observers were civilians.

The object was round, about the size of a matchhead held at arm's length, and was thought to be as large as a big bomber aircraft. The witnesses estimated it was at about 40,000 feet. It was silver, like the color of an aircraft. Their attention was drawn first by a jet passing overhead, and then they saw the object. It moved slowly at first, then seemed to gain speed. They estimated its speed ran from that of a jet up to about 1,000 miles per hour.

The two witnesses were interviewed by phone and were judged to be of doubtful reliability. They admitted the object could have been a high flying aircraft. The lack of a contrail and the gain in speed had convinced them at the time that it was not an aircraft.

The case is filed under Project 10073, the Air Force's official record for unidentified flying object reports. The Air Force conclusion was a possible aircraft.

Reported location

25 Miles West Of Denver, Colo Bergen Park, Colorad, December 1955

Date of incident

December 1955

State / country

? / XX

Page count

2 scanned pages

USAF evaluation

unknown

Microfilm

T1206, Roll 24

Original case file scans

Original case file · scanned by NARAPage 1 of 2

View transcribed text

Te : UFOB INDEX CARD , roo vrop ly cg Bo
WT a 2. LOCATION 12. CONCLUSIONS A
| 2 : | 25 miles west of Denver, Cole [O Wos Balloon
: O Probably Balloon

31 December 1955 Pergen Park, Colorada O Possibly Balloon 2

Reda lO ie a IX Ground-Vi sual O Ground-Radar 0 Brea aia

oMT_31/1805Z Dee 88 0 Air Visual o Air-Intercept Radar XxX Possibly Aircraft :
STPHD TOS i er re i a8 SOURG Es vs bie 0 Was Astronomical :

0 Yes . Z O Probably Astronomical
a eee O Possibly Astronomical Bd :
7. LENGTH OF OBSERVATION - oe § NUMBER OF gmReTs | Far Fo : Pea rea

é Ved, : fi nknown ; A
10. BRIEF SUMMARY OF SIGHTING 11. COMMENTS { : : :
One (1) round object, the size of a matchhead | The two SOURCES were telephonically inter
held at arms length, estimated to YN) be the | viewed by this hq. Both were of dubious
sise of a large type bomber aireraft. It reliability in the opinion of this hq.
was estimated that the object was at 40,000', | Negative results were obtained when this
Object was silver in color ( described as hq tried to contact pilet of jet a/e s
being like aireraft in color.) Observers! Just before object was seen. Both SOURC
attention attracted by jet passing overhead, | admitted the possibility of the object
then they saw object. It moved slowly at having been a high flying a/c when queried.
and then appeared to gain speed. Speed esti | Lack of contrail and gain in speed cone
mated to be from that of jet a/c to 1,000 MPH. vinced the SOURCES (at time of sighting)
Eo Re nee that the object was not an aircraft, .
WM 0 CASE TAN Erik ) Resolved as a POSSIBLE AIRCRAFT
AISOP Form 5 (15 Oct 54) ; : Er
if /

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Source: National Archives Catalog · NAID 28964437