DECLASSIFIEDUSAF PROJECT BLUE BOOK · NARA T-1206
UNITED STATES AIR FORCE

PROJECT BLUE BOOK

UNIDENTIFIED FLYING OBJECT CASE FILES · 1947 – 1969
CASE REFERENCE7011549
DATE OF SIGHTINGOctober 1951
REPORTED LOCATIONNorth Truro Mass
FRAMES23

Machine transcription · mean legibility 53.0/100 · engines: tesseract-200dpi

Transcribed Frames

FRAME 001 / 023tesseract-200dpi
PROJECT 10073 RECORD CARD

.

1. DATE | \ 2. LOCATION \ 12. CONCLUSIONS
nt 19 Pantin - -- 0 Wos Bolloon
72 Oct 1LP5SL North Truro, Mass O Probably Botloon
3. DATE-TIME GROUP 4. TYPE OF OSSERVATION D Possibly Balloon
0 Was Aleroft
Locol —— —- D Ground- Vi sual Cf Ground-Roder CG Probably Aircroft
OMT 22102 I0e = [oz 30% = 02322 — 0 Air Vi suol O Air-Intercopt Roeder ed Possibly Aircroft
5. PHOTOS “SOURCE o Was Astronomicol
CO Yes D Probobly Astronomicol
XXKNo Radar Onerators 0 Possibly Astronomical
7. LENGTH OF OBSERVATION 0, NUMBER OF OBJECTS | 9. COURSE b
. O Insufficient Dota for Eveluation
2 minutes p Wthen S 0 Unknown

-_—_—

10. BRIEF SUMMARY OF SIGHTING
Rudar, Report. See Case file,

EVALUA (TON. « INSUFFICIENT DATA.
This sishting occurred about & hours later thar
vith all conditions similiar except for time, quration of tracks es and direction of the
track. The temperature end altitude informatign are the seme, indicating no temperature
inversion, It would be unlikely that two meteo# trails would be ‘observed the sane day,

and 4, minutes seems too long for this type of
he track direction, range, changes,etc., to e

-_-—

|
|
|

—_ — a

1). COMME™TS

the other sighting (same report number)

able a meaningful evaluation to be mad

‘AC

ATIC FORM 329 (REV 26 SEP $2)

warget,. There isn't sufficient data regard tk:
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‘ ~se mea orice DVD ‘Ty if +
: TRACT Fivh S?PATUS RUSPORT i} J

5!

VIS» 5° Py ny te
rate fh Oct

TIME (Local): 1120

LOCATION: N. Truro, ass,

LENGTH OF TLE OSSERVED: 4 tiin. :

'

SOURCE: Radar operator
ACTION OR COMENTS : ind.cations of rudar phenomena due to weather. ‘

Radar return — unidenti fied object
DESCRIPTION OF INCIDENT: Radar return ~ unidentified object.
FRAME 005 / 023tesseract-200dpi
PROJECT 10073 RECORD CARD

te . a eee
2. LOCATION

1. DATE 12. CONCLUSIONS

¢ -y * / ‘ , 0D Ww B iN
72 October 1951 North Trars, Mass 5 Prabubly Bellon
3. DATE-TIME GROUP 4. TYPE OF OBSERVATION ————|0 Possibly Belloon
QO Wes Aiscroft
Lecal D Ground- Vi sual Ci Ground-Redor a Probab! y hasesale
oMt__O182Z = 0,227, 0 Air Visvol O Air-Intereept Rader | 9 Possibly Aircraft
5. PHOTOS 6. SOURCE . O Wes Astronomical
© Yes 0D Probably Astronomicol
_ No Radar Onerators oO Possibly Astronomicol
7. LENGTH OF OBSERVATION @. NUMBER OF OBJECTS | 9. COURSE 0, Other____
tT Insufficient Deto for Gvaleetion
4, Minutes 1 7 . Senaows

—— ---— —=—_—-_ — — -_s_

10, BRIEF SUMMARY OF SIGHTING 1). COMMENTS
Radar Report. SIE CASE FILE
EVALUATION. . « INSUFFICIiNT DATA
The weather information does not support temperature=inverted anomalous propagation. Ther
probably are other discrepancies in the upper atmosphere which could also canes anomalous
gett The possibility that meteors entered the atin: sphere and were detected

cannot be Gisregarded, and may be the answer td this report. A meteor would cause
haat zation of the air which should increase tha target detectability. Short duration of
the condition supports this theory » bather than anomolous propagaticn,

ATIC PORM 329 (REV 26 SFP $2)
FRAME 006 / 023tesseract-200dpi
.

This sighting occurred about 8 hours later than the other sighting (same report

number) = with all conditions similar except for time, duration of tracking, and

rhe

direction of the track,

The temperature and altitude information are the same, indicating no temperature

t*

inversion, It would be unlikely that two meteor trails would be observed the
same day, and 4 minutes seems too long for this type of target
There isn't sufficient data regarding the track direction, range, changes, etc.,

to enable a meaninful evaluation to be made,

——
FRAME 007 / 023POOR LEGIBILITY — PENDING RE-EXAMINATION
(no machine-readable text on this frame)
FRAME 008 / 023POOR LEGIBILITY — PENDING RE-EXAMINATION
\INCLASSIFIED

AF FORM 112—PART I _ eles!

; (CLASSIFICATION) on
a PROVED 1} Ji VE 1948
COUNTRY REPORT WO. (LEAVE BLANK)
UeSeAe TrehT=-51s =< as Le ’
;
AiR INTELLIGENCE INFORMATION REPORT |

wu aseCt tie ae ae a a
220 OF TNUSUAL RADAR SCOPS SIGHTTIO Pa ee

AEA REPORTED ON FROM (Agency)
SADE __ ft Eabr <=

DATE OF REPORT DATE OF INFORMATION oa ft EVALUATION Th EOE. a —— >
0 TOVEMBER 1951 1, NOVEMEER 1951

PAEPAREO BY MOVES , ~~" | source ... mania =. %. sere ML a, Same

‘ Te , . “wt wear’) . :*
| 32d AIR DLV ( 'R, COCZ19~1, | L NOV 51,
TEN 2,4. GERSHATER, Captain, USAy PppT OF UNUSUAL PALAR TARUsTS. |
NE FERENCES ( Comtrad number, directive, scales tes report, ete., as applicable)

<D6 20D dt —e —_

UMMARY: (Later concise summary of report. Cire significance in n final one sentence paragraph. Lin incloanrea at lower left. Bey in tert of report on AS Formii2z- .'ert 11)

i
1 22 October 1951, the radar station, located at liorhh frux
sssomettar Soserved” = unusual sighting on ita radar scones, at a
eT aie bearer -v 120 to 300 miiss ee and Mast-ilorcthe£as% sway.
Details are listed on Foran Ti, this renor the individual echo

sburns, and the anvear ance of the tracle, sshatasttete the aigary ee 3

bhab cChese tadar "pick=upa" may ac “ally have been that of an usidentifie
flying object, rather than some tyne of radar interference or : Lametion. .

A

-
4
4 4 , a "
bf 6) A. Zor el ben
7 DRUCE Ko BAUIGA RbAER ;

Lt. Colonel, Ucar
Director of intelligence

=< wets.
a DOWNGRADED AT 3 Y). INTERVALS OO”
DECLASSIFIED AFTER 12 YiEARs, ‘©
NOD VIS §300,10 a }
~~
. C+»,

— —

DISTRIBUTION BY ORIGINATOR — — == eae --—-— -- = a

ee
Zoya =~ CU, & Veighteratterson Ais, Dayton, Oto, Attn: »Ulso” |
lL cy ~ Gy rand Cnt APS, Colorado Sorting {Sy | i Naa Attn: Deputy tor intelligence

~

UNC, AS) IFIED

MOTE: THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT, 20U.5.C.—
31 AND 22. AS AMENDED, 173 TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON 15 ROHISITED BY LAW.
IT MAY NOT WE REPRODUCED IN WHOLE OR IN PART, BY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EXCEPT BY PERMISSION OF THE DIRECTOR OF

‘ u x:
1} (TELLIGENCE E, USAF, - os, vy a ve = ened
ss votieiaeas re: oe ‘ ws - Se ey — r ‘ f/f ‘ 5 * f i 7 . -4 ~ ? ?
(CLASSIFICATION) pPd¢-. i “fre

{I Ni CLASS! iF FIED LO SS6O-2 Ye U.S GOVERNMENT PHINTING CFFICE 150 O— oN ag

oe ee
FRAME 009 / 023tesseract-200dpi
9 Ao ae Ore oy 4

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AF FORM 112—PART nl = egies yy * Ee ae ee
APPROVED 1 JUNE 1940 nt WNCLASSIFI*

AIR INTELLIGENCE INFORMATION REPORT

FOOM (Alyency) REPORT heed.

p/T mA ‘Teh 7-515 ° ”
PAGE a oF PAGES

—— — ——- eee - -

- compliance with provisions of ANC Letter lo 200-1, WD evorting oF Information
on Uneonventicnal Aix att", ll April 1991, veterence: 5 ibeparacsaoh 5b therent, the
Sollowing “etalled twport, as reauired in sub-paragraph Sal (2) the roof, ig suly
someeritine an umisual sighting, on lig radar scones, by a station located ab North

Truro, ‘iassachusetts.

~~
’

(2) [eseriction of object; feturns indicated a characteristic Ureusncs shace,

veel fe »~

im yrich the dimension in range is smaller than the dimension in asin

2enS LoS 1b Sve |
ispiitade of the return varied from radar " pickeup" to "nickeun” an on
never snoreciably strony; trese tyo charact evistics ere ty sal O« any
radar xstum of an airerazt Ox Lhving object. Yossibls preclusion of bhe
object being flying object was the extreme ranve of Minal clclkeno,. ‘om
rally, a slying object capable of indicated crest neeed (reference: belo 2)
wonld O06 streamlined.

(D> ‘time of sightings: Fron 22-01182 to O2—01222,, ior duration of four ())
‘damtes. <stinated speed: ooproxviuately 1009 Imots,

(c) Monner of observation: by radar “rickenp", on Plan Position Indicator
CeS@03 Padar set, on frequencies of 2992 and 301) : ogacyelos, b by station
ay arth mim, liassachisetts. Chservation from surface station,

Cd) Location of observer; Opablon located at 1,201; 7093% 4. Single objects ch
wwmved nlong track, Irom })310N3 = to 1:2)0) 15° 05304, 2% mi unimom altie

_- “te ou

énde, as Locations approxisately 120 to 300 miles fast, EMS, and ESR of

-

observer, curing foursiinute observation pickups. Courses: approx USS.

(3) Yaentifieation of observer: Radar otetion. Reliakilts ws normal,
istimatve of reliability and @eerionce; unimown.

eather condi tions aS time of sightings: clear, visibilt+ 15 ables;
Miperatures: 353 ceyreeg Pf,

ote ow *
;

(3) Other factors pegs might ysocide-gi te — phenomanons; lobthing definite. Eon
over, “he misgsstion ia offered t (1) annual "showers" of meteorites
— . . ° t 2
nommally cua 12-15 lMovenber, cach > ee may ba a possible causes (2) voae
oLole | meteor lrom Kopit's comet, due to raturn near the Darth, Uctoeder, 1951.
/@ meteorological phenomena in svidence, however, to indicate either,
8 possloility remains that the object may hava been an unconventional
“lying object.

(3) io physical evidence exista of the ohseryation. Cbject was sbova ocean,

(1) No identification or interception procedums were undertaken,

*

(j) Tocal abrerart aivbome at tine of sightings: no Information eval Lanle,

buWNGRADED AT 32 YEAR INTERVALS, TK aL th OF
DECLASSIFIED AF TER 1 12 YEARS, es / Y ,
YON DIR 6200.10 PEN Ze M 2S ATER

. Chia? 2 Wi deodls

Cactain, Sal
inbellisence Duty Otficer

UNCLASSIFIED

fe: TMIS DOCUMENT CONTAINS [INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT, OU SC —
31 ANO 2. AS AMENDED. 115 TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON 15 PROHISITEO BY LAW,
iT WaY HOT CE 2EPRODUCED IN WHOLE OR IN PART, BY OTHER THAN UNITED STATES AI FORCE AGENCIES, EXCEPT BY PERMISSION OF THE DIRECTOR OF

INTELLIGENCE, USAF, , P i
_ aie Bre aE pee Sia ‘@7577
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1 ONHCRON MENT PUINTING OFFICE - (<> 91 0999
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SINAL REF NR eCRUDGE. REF YOUR tsG
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eo As pd BLE WEATHER MATERIAL BEING 2! ARDED UND ina
re ARATS. © COVER ADDRESSED ATTNS Mee, Re NO CTHER
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i aormmawrannas SPACE ADOVE FOR COMMUNICATIONS CENTER ONLY
FRO.A: (Originator) DATE-TINE GROUP SLOUuTY CLA

INFO:

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—_——— Vr emeuiMCATiONm cant ene —————

JOiT MESSAGEFOR. |"

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UNCLASSIFIED

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09, Arle PRECEDENT!
FOR: ns areae |
peace eae tal ” —_— _,—-
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REFLRS TO MI
HOENTIFICA TION | CLASSIPICATION
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sot; “Informiton oa Vncenventional Aircraft”, dated 31 Ost lgsi. cloarze atvise
folLowLnw3

mo if thems any wonther date aval able from MWIPOY eve. WON Ther Gtationa,

vhich include tareratre v3 eltit.we, hualdity vs eltidice, wind veloalty vs

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bo. Vnae tie tarcet observed by any other nearby redar eculmwenta? If so,

vive Cotalls,

Ue as anomalous crocavation been observed to exteni the raore of croural

clutter by this radar at this ulte, onl cld this coniitdoa xciat during or mar

Sine that unknown tarvet vas observed?

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wanly obte 4TTANtim«adve,

DOWNGRADED AT 3 Y!. inte VvALs:
DECLASSIFIED AFTER 12 Y}. rs.
DOD Dik §200.10

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UNCLASSIFIE SFOURIY LSS hs e598 ce ? . ~—F

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by Ve TER'S NAME (and signature, when required) REL =ASING OFF i ER's SIG ' SWATURE a a

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SYMBOL TELEPHONE OFFICIAL TITLE ee
—_— * rit
Teme ™ ne ees ae eee —_— — —
el - eet -_—- ————— er a hw ew

or 1 Ps CG: RPL ACES HORE, FORM TR, S MAY oe WOE YId-J WU. GV EMNM ENT Motu rtNG Orne
1 Oct 49 WHICH MAY DE USED,
FRAME 012 / 023tesseract-200dpi
The weather information does not support temperature-inverted anomalous
propagation, There probably are other discrepancies in the upper atmosphere
which could also cause anomalous propagation,

Tae possibility that meteors entered the atmosphere and were detected cannot
be disregarded, and may be the answer to this report. A meteor would cause
ionization of the air which diould increase the target detectability. Short

duration of the condition supperts this theory, rather than anomolous propagation,

 igphietientsabnaip tie:
FRAME 013 / 023tesseract-200dpi
HEADQUARTERS
EASTERN AIR DEFENSE FORCE
STEWART AlIR ForCcE Base, NEWSURGH, N. Y.

INT 350.09
PS NOV iGo)
SUBJECT: Information on Unconventional Aircraft rigs
TOA. Commanding General ‘a
Air Materiel Command t \
Wright-Patterson Air Force Base .
Dayton, Ohio

ATIN: ATIAA#GRUDCE ' |
In accordance with message, your headquarters, ST=9117, cated
8 November 1951, and message, this headquarters, trensnitted 15 November
1951, below-listed inclosures are submitted.

FOR THE COMMANDING GENERAL:

9 Incls Ass't Mir Adjuta
le Upper Air Data
3- Synoptic Situation
lh. Eastern US RAORS
5S. Constant Pressure Chart 700 MB
6. Constant Pressure Chart 500 mB
7e Constant Pressure Chart 650 MB >
&. Adiabatic Diagram
9. USAF Weather Plotting Chart
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SS : wt | Ry Wy 37% Ion are, Jam
Stew %z 5 ri . X% 5 Wt iB Li *\ 2 Yd} a4

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Portland, Me. 509 iB LOC 310/44,

Otis, Mass. 500 MB opi «LOC 300/55

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Synoptic Situation

1031 Nich Pressure Cell Centered Over Northern Virginia at 46033504

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Moving NS. Untire Area Under Influence of High Cell.
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324 Mix Division (Defense) AIR OIVIS LOL (nes)
Stewart Air Force Pasa DATS: <3 4K ~f. of Sif
ligwbnech, Now York [..LTLTAL: cet

31901 os Sn a

08 4 1".

SUL UCT: ‘Information on Unconventional Aircralt

TO: Commaullag General
Aly .2terlel Command : |
AiTN: NOIs |

CLonberateerson Air Sorces ase
Dayton, Ono

i. In compliance vith ANG Letter 200e1, datsd il April 1951,

Suvjecbs TIieporting of Information on U aponvents mal Aircrait, the
following recors is cubmitted:

a. Janner of observation: Radar pickup on Plan Position
indicator of C2Sm63 radar at North Truro, llassachusetis.

be vd. "a and place of sighti 12302 to a 22 Ocbover
1952, fron 69915" 7 = 43°05'N to 75°05" 4 = 1291.9";

. Pe fe a oe
GC. Location of observer (cPs-63 radar); 70°03"; = 10°92

d, Length of tine object was observed: uo (2) minutes.

a

: "_ rs] bel
ee. thwber of objects: One

courses: T2Sb, ICN , \OUSIS
élt"$ude unknowns speed: 7/,00 Kooks.

ue

£, eather conditions at tine of sighting: Clouds ~ 1/,00!,
scatbereds srigibilit ty ~ 15 miles; temperature ~ 12°.

Ge Tadar frequency: 2972 and 3014 lecacyeclas,.
h. Probable identity of tarzet; Unimovwn,
i. No interception or identifteation action was talen,

je the indiviemal ccho returns and the Syyenrm

ed
Ce
.
u
a

f

.
\e

track substantiated the probabLlisy of these yn tar Lekuns actually
boing of a flying object rather than sone Kind « yadar inborference
or maliunction. Ths in Jivtdual rubuens were of ike characteristile
Sausages shape in which the dinension in ranze is ewalLer than tie

disension in azimmth. The anplitude of the return variad fron ‘islup
to plelors and was never appreciably strang, both of which are charace
teristic of any aircraft radar return. When the tracks tu axh INTERVALS
DOWNGRAD# M3} re a vex IN
DECLASSIFIED APYTER 12 YEARS.
pov Dis: 200. w

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UNCLASSIFIE!
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Subject: Information on Unconventional Aireraft (Conttd)

the station the strength of the individual echo returna decreased
sharply, a phenomenon coamon to all highly streamlined aircraft. This
track faded at a distance of 30 miles north of the station. ‘hether it
faded because it plunged into the water or whether it faded because of
flying ab an oxtremely high altitude is unknown.

POR THs COMMANDING OF FICuR:

B. J. [OBSERTS
Captain, USA?
Asst. Aix Adj. Cen.

IvEO:
bk Cy = Cay A IC

— OWNGRADED AT 8 YEAR INTERVALS
gi DECLASSIFIED AFTER 12 YEARS.

oe POD DIR 5200.10

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