← ENCOUNTERS DIRECTORYENCOUNTER-CLAIM PROVENANCE PRESENT
E-009533LANDMARK CASE · HIGH CORROBORATIONDATE PRECISION: exactRECORD COMPLETENESS: 100%
Frederick Valentich Bass Strait Disappearance
October 21, 1978Cape Otway / Bass Strait, Victoria / Bass Strait, Australia
Pilot Frederick Valentich radioed Melbourne air traffic control describing an unidentified metallic, green-lighted object repeatedly maneuvering around and above his Cessna 182. He then reported rough engine operation; after a final open-microphone interval, no further transmission was received and neither aircraft nor pilot was found.
// LINKED CLASSIFICATIONS:Physical Trace & Environmental Effects(P-000103)→
// PROVENANCE COVERAGE
100% record completeness
This measures documentation coverage, not whether the encounter or its claims are true.
1 SOURCES · 1 PRIMARY
Date documented
October 21, 1978
Location documented
Cape Otway / Bass Strait, Victoria / Bass Strait, Australia
Map coordinates available
Coordinate precision: region.
Catalogue classification linked
1 family link(s), 1 case-specific component(s).
Published citation-backed claims
3 encounter-target claim(s), 2 component claim(s).
Source coverage
1 unique source edition(s); 1 marked primary for at least one claim.
Assessment has encounter-level provenance
3 encounter-target published claim(s) can carry assessment provenance.
This dossier currently depends on a single source edition; independent coverage would strengthen comparison.
// ASSESSMENT METADATA
Stored case-assessment fields
Stored total witness estimate1
Stored verified-report count0
Instrumental evidence flagNO
Official investigation flagYES
// ENCOUNTER LOCATION · OPENSTREETMAP
COORDINATE PRECISION: REGION