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E-006306LANDMARK CASE · HIGH CORROBORATIONDATE PRECISION: exactRECORD COMPLETENESS: 100%

Seymour Hess Lowell Observatory Disc/Sphere Observation

May 20, 1950Lowell Observatory, Arizona, United States

Meteorologist and astronomer Seymour L. Hess reported a disc or partly illuminated sphere crossing in front of cumulus clouds while the clouds drifted at right angles to its motion. He estimated roughly 100-200 mph and reported no engine noise.

// LINKED CLASSIFICATIONS:Scientific & Observational Types(P-000101)→
Claims are displayed with the source wording, locator, relationship and verification state. Competing claims remain separate rather than being averaged into a single answer.
SOURCE COMPARISON

Encounter · Reported Encounter Observation

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CLAIM-689020reported
“Hess reported a disc or partly illuminated sphere moving across cumulus clouds while the clouds drifted at right angles to the object; he estimated 100-200 mph and heard no engine noise.”
The UFO Evidence
SRC-002107 · Seymour Hess Lowell Observatory report; uploaded PDF pp. 27-27
SUPPORTS
SOURCE COMPARISON

The UFO Evidence (1964) Selected Case Corpus · Hall / NICAP Corpus Method

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CLAIM-689001reported
“The Abstract says NICAP selected 740 reports after considering more than 5,000 signed reports and many hundreds of reports from newspapers and other publications, emphasizing observer qualifications and multiple-observer cases.”
The UFO Evidence
SRC-002107 · Selection method and 740-report figure; uploaded PDF pp. 3-3 · PRIMARY SOURCE
SUPPORTS
CLAIM-689002reported
“Later in the Introduction Hall says the report contains 746 sightings: 575 in the main chronology and 171 in separate concentration chronologies.”
The UFO Evidence
SRC-002107 · 746-sighting total and chronology breakdown; uploaded PDF pp. 8-8 · PRIMARY SOURCE
SUPPORTS
CLAIM-689003reported
“Hall states that 50% of the 575 main-chronology cases involved trained or experienced observers.”
The UFO Evidence
SRC-002107 · Trained/experienced observer statistic; uploaded PDF pp. 8-8 · PRIMARY SOURCE
SUPPORTS
Multiple claim rows are intentionally retained when sources disagree. ANOMALY does not silently reconcile competing values.
SOURCE COMPARISON

The UFO Evidence (1964) Selected Case Corpus · Investigation Source Caveat

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CLAIM-689004reported
“NICAP explicitly distinguishes its physical-UFO investigation from contactee, religious, philosophical, and spiritual claims and says its investigations found no evidence supporting claimed rides in flying saucers, while alleging considerable fraud in that area.”
The UFO Evidence
SRC-002107 · NICAP scope and contactee/fraud disclaimer; uploaded PDF pp. 4-5 · PRIMARY SOURCE
SUPPORTS
Seymour Hess Lowell Observatory Disc/Sphere Observation (May 20, 1950): Evidence Dossier & Witness Reports | ANOMALY | ANOMALY UAP Archive & Controlled Vocabulary