Office of the Secretary of Defense: 10_Puerto_Rico_UAP_CR

UNCLASSIFIED
5
UNCLASSIFIED
Observable Characteristics and Attribution
Size and Shape: AARO employed pixel analysis to estimate the objects’ sizes to be smaller than
one meter (three feet). Pixel analysis is a method of measuring an object’s size by comparing it
to an object of known dimensions. The objects’ shapes are indistinct.
Number of Objects: AARO assesses with high confidence that the video footage depicts two
objects traveling near each other rather than a single object splitting into two.
Attribution: AARO assesses with moderate confidence that the objects depicted in the video are
sky lanterns. AARO confirmed with local hospitality industry vendors that it is common
practice for hotels and resorts in the area to release sky lanterns during celebrations. The
objects’ size and thermal signature variability support this conclusion. Sky lanterns are typically
smaller than one meter in diameter and emit a flickering, weakening thermal signature as they
expend fuel, gradually losing distinctiveness against the background environment when viewed
through an IR sensor. However, the video’s poor quality reduces AARO’s confidence in
categorically identifying the objects.
IR signatures can appear to “vanish” when the thermal contrast between the object and
background becomes indistinguishable (Figure 4). The objects seem to disappear shortly after the
ocean appears in the background. The objects did not enter the water. Rather, the sensor could
not distinguish the objects from their environment due to a lack of thermal contrast between
them and the ocean.
Figure 4: IR signatures can lose distinctiveness when thermal contrast is low.
Page determined to be Unclassified
Reviewed by Chief of Staff, AARO
IAW FY24 NDAA, Section 1841(a)(1)(C)
Date: 3/20/2025
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