When and where was Topcliffe RAF Operation Mainbrace Object documented?

This encounter was documented on September 20, 1952 in RAF Topcliffe, North Yorkshire, United Kingdom.

What sources and physical claims back the Topcliffe RAF Operation Mainbrace Object record?

The ANOMALY archive indexes 0 independent source citations across 0 claims, achieving a provenance completeness score of 43%.

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E-006715DATE PRECISION: exactRECORD COMPLETENESS: 43%

Topcliffe RAF Operation Mainbrace Object

Name: Topcliffe RAF Operation Mainbrace Object
Start: September 20, 1952
Location: RAF Topcliffe, United Kingdom

September 20, 1952RAF Topcliffe, North Yorkshire, United Kingdom

RAF personnel reportedly saw a silver circular object about 15,000 feet over Topcliffe, initially behind a Meteor jet, then descending in a pendulum-like motion, rotating and accelerating away.

// LINKED CLASSIFICATIONS:Disc / Saucer(C-000253)→

// PROVENANCE COVERAGE

43% record completeness

This measures documentation coverage, not whether the encounter or its claims are true.

0 SOURCES · 0 PRIMARY

Date documented

September 20, 1952

Location documented

RAF Topcliffe, North Yorkshire, United Kingdom

Map coordinates available

No latitude/longitude is available for mapping.

Catalogue classification linked

1 family link(s), 0 case-specific component(s).

Published citation-backed claims

0 encounter-target claim(s), 0 component claim(s).

Source coverage

0 unique source edition(s); 0 marked primary for at least one claim.

Assessment has encounter-level provenance

Assessment fields exist, but no encounter-target published citation-backed claim currently supports them.

Assessment values are present without encounter-target published citation-backed claims. Treat the matrix as unprovenanced metadata until direct claims are added.

Witness totals are stored, but no encounter-level cited claim currently documents where those numbers came from.

// ASSESSMENT METADATA

Stored case-assessment fields

DIRECT PROVENANCE INCOMPLETE

Stored total witness estimate3

Stored verified-report count0

Instrumental evidence flagNO

Official investigation flagYES

These stored assessment values are shown transparently but should not be treated as source-backed facts until encounter-target claims cite their provenance.