ev-intel-a5a5ff150b9c

AISS-UFOB-328-55 / SMRBP-9-500-E — 1955-09-13 — Palmdale, California (Air Force Plant 42)

1955-09-13· Palmdale, California (Air Force Plant 42)Resolved prosaic
Strangeness (S)
0.0
Credibility (P)
1.0
Evidence (EVID)
1.0
Date conf
9.0
Loc conf
0.0

Narrative

At 1610Z on 15 September 1955 at Air Force Plant 42, Palmdale, California, observers heard a sound and looked up to see a single flat-topped, rounded-ended object at 270-degree azimuth and 45-degree elevation. The object was first seen heading west at 4,800-5,840 feet MSL in a gradual left climbing turn to south then southeast, very slow (estimated 100 mph). It produced exhaust blasts and a constant deep undertone like diesel roar with overtones like afterburner roar. Disappearance was gradual after 10-15 minutes. Investigation by Flt 1-C checked with Edwards AFB for experimental aircraft tests but no possible cause for phenomenon was known. Resolved as possibly aircraft.

extracted via: llm_subagent_v1

Witnesses (2)

Source documents (1)

Click filename to view on Internet Archive (where these are mirrored as public-domain US-government records).

Score evidence (6)

Why this event scored the way it did. Every contribution is traceable.

s

  • resolved as (-3.0)
  • outcome=resolved_prosaic (cap S<=3)
  • post-blend cap S<=3 (resolved_prosaic)

p

  • docs=1 (+0.5)
  • single agency (+0.5)

evid

  • narrative only (base 1)