PROJECT BLUE BOOK

PROJECT 10073 RECORD CARD
1. DATE 2. LOCATION 12. CONCLUSIONS
0 Was Balloon
23 Sep 55 Leonape, Pa 0 Probably Balloon
4.TYPE OF OBSERVATION Possibly Balloon
Local Ground-Visual Ground-Rodar 0 Was Aircraft
0 Probably Aircraft
GMT_23/1630Z AirVisual Air-Intercept Radar 0 Possibly Aircraft
5. PHOTOS SOURCE 0 Was Astronomical
Ys 00 Probably Astronomical
No civ Possibly Astronomical
7. LENGTH OF OBSERVATION NUMBER OF OBJECTS 9. COURSE Other.
000 Insufficient Data for Evaluation
Unknown
3-5 min 1 unk
TO BRIEF SUMMARY OF SIGHTING 11. COMMENTS
Dark obj, shaped toy top. Had Possible balloon observation.
rudder underneath.
ATIC FORM
: A
..
-
.

AF FORM 112PART II BAB
APPROVED 1 JUNE 1948 CLASSIFICATI
. AIR INTELLIGENCE INFORMATION REPORT
FROM (Ageney) REPORT NO. 8-9-55 Part Two
Flight, 3-H, 4602d AISS 6 8
PAGE OF PAGES
Incl. #2, PART TWO
TT MSG: GPCT 2968 FM CCMDR 82ND FTR GP DFF .NCCA WILM DEL
PCT. .
PP RJEPNB RJEPJR
DE RJEPNY 11
B 240315Z ..
FM COMDR 2ETH AIRDIVDEF ROSLYN AFS NY
TO RJEPNB/DIR INTEL EADF STEWART AFB NY
RJEPNB/HQ 46O2ND AISS EAIF STEWART ·AFB NY
RJEPJR/FIT
P.232100Z
FM CCMDR·82ND FTR GP DEF NCCA WILM' DEL
TO RJEDEN/CCMDR ADC ENT AFB COLORADO SPRINGS 3 COLORADO
RJEPNY/CCMDE 26TH AIR DIV DEF ROSLYN AFS NY
RJEDNP/Ca AIRTECH INTEL CEN WPAFB B OHIO
RJEPHQ/CC
BT
UNCLASSIFIED/ GPOT 2968, REPORT /UNCLASSIFIED/ 2968, REPORT UFCB
1/ DESCRIPTION OF OBJECTS
A CHILD'S TOP
B SIZE OF SIZE OF T BASEBALL BASEBA LL
MARK
D ONE ONE /1/
E N/A N/A
F RUDDER UNDERNEATH UNDER CBJECP CBJECP
G NA G N/A
H H N/A N/A
PAGE TWO RJEPNL 39A . . .
IN/A
DESCRIPTION OF COURSE OF CEJECT :
A LIGHT AIRCRAFT (PIPER GUB)
Bi.
C 1
DISAPPEARED
E UNKNCHN
F THREE /3/TO FIVE /5/ MINUTES
/3/ MANNER RVATION:
A GROUND-VISUAL
B BINCCUIARS
C NA
/4/ TIME AND
A 1230 EDST
B DAY
/5/ LOCATION OF OBSERVER:
A RD NIR 5 LEOMPE PA. PA ROUTE 1OO-52
/6/ IDFITFYING INFORMATION CF ALL OBSERVERS
A NRS. DORTH ILLER CARTY, AGE 33, MAILING ADDRESS WFST CHFSTER
RD NER 5 L SEWIFE

been a radiosonde balloon in the
vicinity of West Chester, Pennsylvania at the aporoximate time of the sighting,
ballcon which was released at O4oo EST.
c. The fact that the object was not picked un on radar in the
suggests that it was not a matal objec t as belic ed by the obsorver.
.
d, The naar coincidence in time that the Swarthmore balloon was re-
leaaed and the changing winda which it encountered during its assent does not
proclude the Dossibility of its having, drifted toward the oroclude the bossibillty of it having drifted toward the vicinity of West vicinity of West
Chester at the approximat time that the UFOB Chestor at the approximats time that was sighted. as sighted.
2, 2. The absencs of sound associatod with the rbject of sound associatod with the rbject seema to negate the Se3mA to negate the
chanc of its having bean self-prooellod, simultaneously incroasing the chance
that it was probably a friondly objoct. a friendly objoct.
CheGB3an CheB3fan
CHESTER B. HANSON
Captain, USAF
Officer in Charge
COMMENTS of Approving Officer: a
Concur wi.th the opinion the Preparing Officer that this s ghting was
probably caused by a radiosonde type weather bailoon.
.
MATE: THIS DOCI TCONTAINCINEORMATICNSCCCTINCTUE

LIGEINCE INPORMVIATION
FROM (.gCHCD) HEPORT NO. 3H-UFC3-9-55 Fart Two
Flight 3-k, 4602d AISS PAGE 7 OF 8 PAGES
Inol, #2, AART TWO
TT ESG GP 2968 FM CCIDR 82N FTR GP DEP NOCA WILM DEL
FAGE THREE RJEPNL 39K
/7/ MEATHER ID WINDS ALGT
A FAIR
B ILG 2500 VIS, WINDS
EAST 9
C PHL 4000 OCST, VIS -
9 C000' 280 - 1OK
10000' 290 - 20K
16000 300 - 25K
20000 300 - 3OK
30000 300 - 55K
50000' 330- 70K
800001 N/A
E 1/10 SC 2500
/3/ NECATIVE
NEGATIVE REPORT FRCM CGI STATIONS
/10/ ONE AIRLINER UNKNOWN IDEMTIFICATION
/11/ GROUP OPERATIONS (FFICER 82ND FTR GROUP, AIR DEFENSE.
NO CCMMENT
/12/ NEGATIVE /12/ NEGATIVE
BT BT
23/21127 RJEPNL JEPNL
TRUE COPY:
CherS3/fanm
CHESTER B. HANSON CHESTER B.HANSON
Captain, USAF Captain, USAF
.
. .
NOTE: THIS DOCUMENT CONTAINIS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE AL F. SI U. S. C.-
31 AND 32. AS AMENDED I13 TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROIIMHIIEO DY LAW.
IT MAY NOT UE REPRODUCED IN WHOLE OR IN PART. BY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EXCEPT DY PERMISSION OF THE DIRCCTOR OF

ACTON 8
MPA544 YDD.3: T TYA.24 THE.E. T 52123
H RJEDEN RJEDUP RJEPT R.
IE F RJEPNL 39A IWitues 4ast
F 23212.2 G
FI CCHDR SEND FTR GP DEF NOCA WILN DEL
TO RJEDEN/CCIDR ADC ENT AFE CCLCRADO SPRINGS COLCRADC ST
RJEPNY/CONDR 26TH AIRDIVDEF ROSLUN AFS NY
RJEDWP/CONDR AIRTECH INTEL CEN WPAFB CHIC release
RJEPHO/CONDR DIR CF INTLL NO USAF WASHDC 8
ET s 'n OTMO 'I EO1A4   0TI5 6USS 3N C09 6
/UCKALSSIFIED/GPOT 29SS. RL-PCRT CF UFCD
/1/DESCRIPTION OF OFJECTS /1/DESCRIPTION OF OfJECTS 4x2
A CHILD'S TOP 3+ 11 4×22 71 3N1 c09
4
E SIZE CF BASEBALL E SIZE CF BASIBALL
C DARK
D ONE /1/
E NA E MA
F RUDDER UNDERNEATH CDJECT
GI/A
11/A
.
.!
.
.

"
SEP
1955
2 ^
'
PAGE TUC RJEPHL SSA
I /A
/1/DESCRIPTICN OF COURSE CF CEJECT: 40
(PIPER CUE)
11
C
D LISAPPEARED D LISAPPEARED
L CIK.CON L CK.CON
1.4 TEREE /3/ TO FIVE /5 TEREE 73/ TO FIVE IITSC INNTSC
/3/ LANNER CF CESERVATICN: /3/ LAINER CF CESERVATICN:
A GRCUND-VISUAL
B BINCCULARS E BINCCULARS :
CM/A -
74 TIME AND DATE OF SIGHTING:
A 123- EDST
E DAY
75/ LOCATION CF OBSERVER: 03 4136 0010
.
/6/ DDENTIFIYING INFCRMATION OF ALL CISERVLRS
AGI 33, AILI G ADIRESS
.
.

'
PAGE THREE RJEPNL 3SA
/7/ WEATHER AND WINDS ALOFT
A FAIR RCNRNOLAVA
B ILG 250: SCD, 4009 SCD, 1 BKN, 2546d EXN, 15 NILE VIS, WINDS G3
EAST S
C PHL 4-S CCST, VIS 8 RH--VINDS SE S
D 6.' 23.- 1.K
1 25-2.K 1_ 29-2.K IT OT
CAD CADI
15' 3. - 25K
2000 365-50K 2000 365-50K
30w01' 305 - 55K 3000)' 305 - 55K
550 355 -7-K 5u.2' 35. -7-K
BLELL' M/A BLELL M/A
1/1 Sc -252/10 SC - 4386 2/10 - AC - EST 2/1 CIRUS 25033
/C/ NEGATIVE
/S/ NEGATIVE REPORT FRCH CGI STATIONS
710/ ONE AIRLINER UNKNOWN IDENTIFICATION
/11/ GROUP CPERATIONS CFFICER, 32ND FIG GROUP, AIR DEFENSE.
Ne COMMENT
/12/ NEGATIVE
3T V5 8 0 I NU107 71 3 500 O*
23/2112Z SCP RJTPNL
-N:
~

AF FORM 112-PART (CLASSIFICATION)
APPROVED 1 JUNE 1948
COUNTRY REPORT NO.
.USA
AIR. INTELLIGENCE INFORMATION REPORT
SUJ
UFOB
ARZA REPORTED ON FROM (,(geney)
WEST CHESTER, PA. Flight 3-H, 4602d AISS
DATEOF RIPORT DATK OF INFORMATION EVALUATION
4 October 1955 23 September 1955
PREPARED BY (OMEOT) SOURCE
CHESTER B. HANSON, Captain, USAF MRS.
REFERENCKS (COMPOnW mber, direcdise, praTose repor, dte., as applicabla TT MSG IM CMR 82ND PTR GP GPOT 2968, dtd 23/2112Z
Sept 55; Conversation between Miaj Thrasher and Lt Berrier, Flt.3-H, 27 Sep 1955
SUMMARY: (EWr comelse sumMery of report. Anal one-endence paragraph. Lis inclosuree of loseer left. Begin last of report on Ar Form 11s- "arl 11.)
I.. CONTENTS:
. :
PART ONE: Description of sighting by Mrs.
Lenape Road, RFD5, West Chester, Pennsylvania (GooRef
GJQK 2557).
1
PART TWO: Supplomentary Investigative Efforts
PART TiRImE: Comments of Proparing Officer
2
II. SUMMARy: An unldontified flying objoct was reported II. SUMMARY: An unldontified flying objoct was reported to the Oporations to the Oporations
Officer on duty at New Cantle AFB, Delaware (Geokef GJQk 254O) shortly aftor its Officer on duty at New Cantle AFB, Delaware (GeoRef GJQk 254O) shortly aftor its
sighting by Mrs. vat 23/1630 Soptomber 1955 near West Chester, near West Chester,
Pennsylvania. The following Pennsylvania. The following roport is the result of an intcrviow with tho abovo- roport is the result of an interview with tho abovo-
mentioned observor and various other agencios in the vicinity, of thc sighting whose
assistance was sought in detormining the probable cause of tho sighting. assistance was sought in detormining the probable causo of tho sighting.
III. INVESTIGATON: 2/Lt Charl S rior, O 3019814
- CheEffoman
CHESTER D. LLANSON
Captain, USAF.
Officer in Chargo
# ..
APPROVED:
9
JOHN M WHITE JR
Colonel, USAF
Commander
2INCLS. (Soo individual parts)
DISTRIBUTION BY ORIGINATOR
D/I, USAF; COmDR, ATIC; D/I, 26 ADiv; COmDr, L6O2d AISS; OIC, Ft 3-H, ME:.

plane's engine drew her
attention to the sky. SOURCE dashed around to the side of her house in order to scan
the horizon but was unablo to see the aircraft. She began scanning the sky, when
suddenly she noticed ths appearance flying object, oval-shaped and char-
coal gray in color moving across th sky.
.
SOUncE watchod the object perform a counter-clockwise rotational movemen
which continued as the oh ject moved away and out of sight. The time of sighting was
betwcen two nd.five nintas. Its course seemed to he due west.
SOURCE could discern no sound being emitted by the UroB during t the time
she observed it, even though it was the sputtering sound which had first drawm her
attention to the sky attention to the sky. During th sighting an unidentified airliner, flying low
at what SOURCE estimated to have b ,OOo ft., flew below and to the right of tho
UFOB. 2
. In addition to the oval-like configuration of the U'OB already noted, In addition to the oval-like configuration of the U'OB already noted,
SOuRce described that after she had dashed inside to get a set of 7 x 50 binoculars,
she was able to distinguish a small blister oh the ventral center of the object as
well as a circular object just off the right side of the UFOB. SURCE was certain
that the smaller object was moving independent of the larger one.
SOURCE described UFOB's' physical appearance to ave rescmbled the
cover of an alligator skin purse with slightl y irregular protrusi ons visable.
1
The condition of the sky was overcast with
Ho photographs were taken of the UFOB.
:1 .
/
NOTE: THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT, 5O U. S. C.-
3I AND 32. AS AMENDEO. ITS TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROHIBITED RY I

FROM (Agency)
Part One
Flight 3-H, 4602d AISS PAGE 3 OF 8
PAGES
:
Object's Formation:
.
" .
4
14 - .
+ CEILING
COMPLETE OVERCAST 3500'
. : 1 COUNTER-CLOCKNNSS
ROTATION NBTED
BY DBSERUER
7 ,
W
# 4
..
. 1 1 SOURCE UNCERTAIN
ABOUT ATTACHNENT ABO4T ATYACHNENT
BETWEEN JMACL JMACL AN AN
LARGER OBJFC CBJ8
.
.
/ 1.' S
1
/ /
I
. 1 I +
. 1
.. . 1
1 1 .
- HEIGHT
. / - 1,000!
1
1 E i
1 CMOT
40
i1
1
tv-
OVSERVER GRO
NOTE: THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT, 5O U. S. C.—
3AND 32. AS AMENDED. ITS TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROHIBITED BY LAW.
IT MAY NOT BE REPRODUCED IN WHOLE OR IN PART, BY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EXCEPT BY PERMISSION OF THE DIRECTOR OF
INTELLIGENCE, USAF. .

revealed that their
1600 EDT, EDT. and 2/oo EUr and this schedule was adhered to on the 23rd Septem-
ber,withithecexceptionoot tha: Looo.EDT relbase which warsemade at lol6 EDT. The balloch
wsof the regular typ, carrying radiosonde equipmen nsisting of a small modulator
box approximately 76" squars and a cone-shaped transmi mounted in a white
plastio bex which is suspanded small red achute the balloon. When the bal-
loon bursts between 50,000-an parachute nflates carrying the radio-
sonde equipment safely to th gray diameter neoprene with
attached radiosonde equipment could be seen from the ground fo several thousand feet,
depending on the vision of the observer or the visual aids used.
near Swarthmore, Pa., (Geurat O.JQK 3758) disclosed the following data O.JQK 3758) disclosed the following data obtained obtained from
the balloon whioh was released at l0:l6 EDr on 23 September 1955: the balloon which was released at lo:l6 EDT on 23 September 1955:
Time After Release Azimuth of Balloon
10:16 (Releaaed) 2590
10:18 274.8
10:20 302.9
10:22 307.4
10:32 121.9
10:42 146.8
10:49 (Last Reading) 134.2
This talloon may have burst shortly after the last reading was made or it may have
risen higher and drifted into winds which could have carried it tovard the vicinity of
West Chester, Pa., however this isn't definately known. From the wind data above, the
indication is that this balloon drifted toward Southern n New Jersey in the Chesapeake
Area. .
GJCK 2639) was contacted, The officer on duty staied th it his activity did not release
weather balloons. He further stated that he had furnished S2nd Ftr Gp Operations with
the weather information for inclusion in the preliminary rep ceiling at that
time had been 35oo ft. To the Weather Officer's knonledge, there been no meteoro-
logical releases of any kind in the immediate vicinity of West Chester, Fa. on 23
September 1955..
TES WITHIN THE MEANING OF THE ESPIONAGE ACT, 5O U. S. C.- DCON
IS PROMMTEO BY LAW.

been released fr
September at the following times, O400 Fs 1600 EST, and 2200 EST. The
have drifted as far as West Chester In the event of a leak in the balloon, it pro-
bably would not have attained a sufficient altitude for it to have burst.If this had
been the ease:with respect to the balloon launched at O4oo EST, it may feasibly have
drifted in the higher velocity wind currents that are common above 35,oooft, rcaching
the vicinity of the sighting at the approximate time the UFOB was observed.
The following data vas recorded on the balloon released at O4oo EST:
:
Altitude (ft) Wind Direction : Wind Velocity (knots)
6,000 250 14
8,000 250 19
10,000 270 26
14,000 270
20,000 270
25,000 290
30,000 290
35,000 300
45,000 310
50,000 330 70
- .
8. A check with Air Traffle Control at Friendship Field (Geolter GJFK 22l2),Md.,
t Cheater,
nia on 23 Sentenhar
9. Air Traffic Control at Philadelphia Inter nn-
by
firmation on the ircl.
1
30.47)
was also contacted but had no information to relate which might serve to coriirr. th:
sighting of a UFOB near West Chester, Pennsylvania on 23 September 1955.
NOTE: THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPION E. CT. SO U . C
3I AND 32, AS AMENDED. ITS TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROHICIIED EY LA
IT MAY NOT BE REPRODUCED IN WHOLE OR IN PART, BY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EXCEPT DY PERMISLION OF THS DIRECIOR F
INTFLLIGFNCE USAF