Petrozavodsk phenomenon

Case

Overview

Residents reported a pulsing light spreading over the city; the event prompted the Soviet Academy of Sciences' Setka research program on anomalous atmospheric phenomena.

Investigative phases

Soviet Academy of Sciences review; Setka-AN program; later analysis

Reported phenomena

Large luminous "jellyfish" shape

Public evidence status

Secondary accounts and Soviet program records

Alternative explanations / caveats

Launch of Kosmos-955 from Plesetsk (widely accepted)

Next research tasks

Collect Setka-AN program records

Last reviewed

2026-11-11

Assessment

Event date

1977-09-20

Source category

Secondary accounts; Soviet program

Original data accessibility

Limited

Witness / instrument basis

Mass witnesses

Corroboration limitations

Program records not reviewed

Extraordinary claim assessment

Explained as rocket launch

Current status

Largely explained

Priority research task

Collect Setka records

Lead source ID

SRC-V86-43

Last reviewed

2026-11-11

Evidence (1)

• Event and Soviet Academy of Sciences response (Setka-AN) Documented
  CE-V86-27 · 1977-09-20 · Secondary accounts of state program
  Gaps: Program records not reviewed

Documents gathered (1 line of evidence)

0 readable here · 1 with a linked primary record · 0 still need a document · All cases on the evidence map

• Event and Soviet Academy of Sciences response (Setka-AN) Primary record linked
  CE-V86-27 · Petrozavodsk phenomenon; FBIS Daily Report, 23 Sep 1977: TASS, 'Unusual natural phenomenon observed in Karelia' (Petrozavodsk, 20 Sep 1977), CIA document 0005515663