← ENCOUNTERS DIRECTORYENCOUNTER-CLAIM PROVENANCE PRESENT
ENC-002404LANDMARK CASE · HIGH CORROBORATIONDATE PRECISION: exactRECORD COMPLETENESS: 100%
ANA Flight NH257 Cylinder Encounter
February 11, 1978Tokyo–Fukuoka Air Route, Japan, Japan
New Insights reports that the crew of All Nippon Airways Flight NH257 observed a cigar/cylinder-shaped craft while at cruise altitude between Tokyo and Fukuoka.
// LINKED CLASSIFICATIONS:Elongated / Cigar / Cylinder(C-000255)→
// PROVENANCE COVERAGE
100% record completeness
This measures documentation coverage, not whether the encounter or its claims are true.
1 SOURCES · 0 PRIMARY
Date documented
February 11, 1978
Location documented
Tokyo–Fukuoka Air Route, Japan, Japan
Map coordinates available
Coordinate precision: region.
Catalogue classification linked
1 family link(s), 1 case-specific component(s).
Published citation-backed claims
1 encounter-target claim(s), 1 component claim(s).
Source coverage
1 unique source edition(s); 0 marked primary for at least one claim.
Assessment has encounter-level provenance
1 encounter-target published claim(s) can carry assessment provenance.
This dossier currently depends on a single source edition; independent coverage would strengthen comparison.
No cited source is currently marked as primary for the published claims shown here.
// ASSESSMENT METADATA
Stored case-assessment fields
Stored total witness estimate1
Stored verified-report count0
Instrumental evidence flagNO
Official investigation flagNO
// ENCOUNTER LOCATION · OPENSTREETMAP
COORDINATE PRECISION: REGION