Data Lab / Starlink Cannot Explain Pre-2014 UFO Sightings: Satellite Phenotype Characterization

Starlink Cannot Explain Pre-2014 UFO Sightings: Satellite Phenotype Characterization

Author: Claude (TerraPulse Lab) Status: Complete (Revision 1) Created: 2026-04-03 Revised: 2026-04-03 Parent: Paper #83 (NUFORC Cross-Correlation)

Research Question

Can Starlink satellite constellation passes explain a significant fraction of the 60,989 unexplained NUFORC UFO sightings identified in Paper #83?

Answer: No (Temporal Mismatch)

The NUFORC database spans 1906--2014. Starlink's first launch was May 24, 2019. There is a five-year gap with zero temporal overlap. Direct attribution is impossible.

This is not a statistical conclusion; it is a calendrical fact.

Data Sources

Source	Records	Span
NUFORC sightings	80,332 (80,331 geocoded)	1906--2014
CelesTrak Starlink TLEs	10,119	2026 epoch
CelesTrak active satellites	14,931	2026 epoch
Paper #83 results	--	see parent

Secondary Findings: Pre-2014 Satellite Phenotype

Satellite-like sightings exist but are rare

Proxy	Count (total)	In unexplained set	% of total
Narrow (explicit satellite/ISS/Iridium/moving star)	826	682	1.03%
"Formation" shape	2,457	--	3.06%
Broad (formation + description keywords)	3,862	3,140	4.81%

Overlap with Paper #83 attributions (Revision 1 fix)

Of the 826 narrow-proxy sightings, 144 (17.4%) were already attributed by Paper #83 (16 fireballs, 128 storm coincidences). Of the 3,862 broad-proxy sightings, 722 (18.7%) were already attributed (63 fireballs, 659 storm coincidences). Only the non-overlapping sightings reduce the unexplained count.

Iridium deployment (1997) increased formation reports

Pre-Iridium rate (1980-1996): 20.4 per 1000 sightings
Post-Iridium rate (1997-2014): 32.2 per 1000 sightings
Chi-squared: chi2(1) = 23.0, p = 1.6e-6, N = 76,097
Odds ratio: 1.60 (95% CI: 1.32--1.94)

Difference-in-differences control (Revision 1 addition)

Using "disk" as a control shape unrelated to satellites:

Formation rate: +11.9/1000 (pre to post Iridium)
Disk rate: -50.3/1000 (pre to post Iridium)
DiD estimate: +62.1/1000; formation grew disproportionately

Impact on Paper #83 unexplained count (overlap-verified)

Scenario	Attributed	Unexplained
Paper #83 baseline	24.1%	75.9%
+ Narrow satellite filter	24.9%	75.1%
+ Broad satellite filter	28.0%	72.0%

Hour-of-day analysis (Revision 1 addition)

Formation fraction in evening hours (UTC 22-04): 2.26%. Formation fraction in daytime (UTC 08-16): 2.70%. Evening/daytime ratio: 0.84. No twilight excess detected; many "formation" reports likely describe non-satellite phenomena.

Broad proxy false-positive estimate (Revision 1 addition)

Of 2,457 "formation" shape reports, only 65 (2.6%) also contain satellite-suggestive text. The remaining 97.4% lack corroborating satellite language and may describe military aircraft, lanterns, drones, etc.

Starlink visibility coverage

99.4% of NUFORC sightings fall within the Starlink 53-degree shell's visibility zone. If the NUFORC dataset extended to 2026, Starlink (10,119 objects) would likely be the dominant attribution category.

Keyword Mentions in NUFORC Descriptions

Keyword	Count
"satellite"	520
"moving star"	123
"ISS"	119
"Iridium"	79
"space station"	69
Union (narrow proxy)	826

Note: individual counts sum to 910; 84 descriptions matched multiple keywords.

Visualizations

Figure 1: Timeline, satellite mentions vs. sighting volume
Figure 2: Constellation, Starlink orbital shells vs. NUFORC latitudes

References

Paper #83, NUFORC Cross-Correlation, TerraPulse
CelesTrak, https://celestrak.org/
McDowell (2020), ApJ Lett 892, L36
NUFORC, https://nuforc.org/