DOW-UAP-D102: Project Blue Book File on Tremonton Film, Utah, 1952

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Serial:
e •UNCLASSIFlED MAY 4 1~5 ·n
Subj: Interpretation of Movies of Unidentified Objects;
progress report on
L Analysis of the graph correlating luminosity and size
indicate that as the luminosity of the objects increase, the size
is larger also. This couJ..d be the effect of viewing directly, a
reflecting surface. This is considered not probable because of
the length of time they were viewed continuously on the film, approxi
mately 90 seconds, and because of the angle through which they were
photographed, approXimately 6o degrees.
'It is felt that if these images are reflective surfaces,
blinking would occur during a period of 90 seconds while passing
through a n angle of E,o degrees when photographed at the rate of
16 frames per second. This premise would permit highly reflective
ball oons or spheroids to be a possibility . However, the velocit :,, and
acceleration computations (sub paragraph 8) rule this possibility out.
It appears, therefore, that if these objects are a reflecting surface,
they are of a design, speed, and power not commonly known. The velocity
and acceleration attributed to the objects may be caused by light
reflected off a highly refl ective surface onto a n atomospheric screen
where a slight angular turn of the reflective surface wouJ..d appear as
high acceleration. This possibility is considered not probable because
of the sun angle and atmospheric condition reported at the time of
photography and because of the variations in luminosity which, under
the above conditions would remain constant.
It is the majority opinion of the group conducting this analysis
that these images are light sources. This will explain the non-blinking
and variations i n luminosity - but not the velocity or acceleration
faciors. In either case, light source or reflective surface, it
appears as ti' the objects are of a nature which we are not able to
identify in terms of natural phe nomena or cpmmonly known man-taade objects.
2. There is no indication of what kind of objects could have
caused the images except that they must be of a construction , design,
and mater ial not commonly knovn. This is indicated b y the computed
acceleration rate and elocity (answer 8). For the same reasons, birds,
airers.ft and balloons are ruled out.
3. An analysis of the charts relative to movement indicate that
there were group and ind.1vidual moveme nt. W1thin a group it appears
as if the individual objects were moving counter-clock-wise aJ.ong an
elliptical or similar track. Thus \then two objects crossed the camera
line of sight they will appear to fuse i nto one. As they continued
along their paths it will appear as if one objec t became two. Thie
occured at reglar intervals at approXimately every 25th frame as
plotted in chart s 5a and 5b.
DOWNGRADED A'!, 3 YEAR Th'T'J'ERVA'u13;
DECLASSIFIED AFTER 12 YEARS.
DOD DIR 6200.10
4
DECLASSIFIED Authority NND 923007