West Indies, April 1958April 1958

In April 1958, observers across a vast region of the Caribbean and the eastern United States witnessed a spectacular display of brilliant objects streaking across the night sky. Ships at sea in the Caribbean saw flaming bodies with long, glowing tails and smaller objects that seemed to separate and follow in formation. Witnesses on the ground in the Virgin Islands, Martinique, and Barbados reported similar sightings. The main object was several times brighter than Venus. Some observers described it as a round, bright blue-white head with a flattened, reddish lower half that emitted sparks. Smaller objects trailed behind, each developing its own glowing tail. The sightings occurred over roughly ten minutes and covered a distance of about 2,700 miles from Connecticut to the coast of British Guiana, with the objects traveling in a straight, horizontal path at high speed and making no noise.

The Air Force's investigation quickly solved the mystery. The date was April 14, 1958, and astronomers had been tracking the re-entry of Sputnik II, the Russian satellite launched on November 3, 1957. Astronomers had predicted the satellite would spiral down and fall to Earth sometime between April 12 and April 15, and had refined their estimate to within a few hours of the actual event. The file notes that the Air Force had immediate access to this information through Spacetrack (a satellite tracking system). Whenever a reported UFO resembled a falling satellite, investigators checked with Spacetrack right away. The spectacular luminous display that witnesses had seen was the satellite burning up during its re-entry into the atmosphere.

The Air Force's conclusion appears in the case file's summary, which marks the evaluation as "probably missile" or "probably balloon," though the broader narrative in the file confirms the object was actually the re-entry of a known Soviet satellite. The file emphasizes that without this essential fact, hundreds of observers might have remained convinced they had witnessed a genuine unknown.

The full case file, comprising 8 pages as held by the National Archives, is reproduced below.