July 16, 1957 — near Grand Canyon
1:56 p.m. 1st Lt. Clifford E. Pocock, scope operator A2C Walter Lyons, and control technician A1C Armand Therrien at Las Vegas Air Force Station [now closed] at Angel Peak, Nevada, are using the FPS-3A L-band search radar and track an inbound target at about 6,200 mph when it “stopped abruptly” and “remained stationary” for 12 seconds to the east-northeast 85 miles away to the north of Grand Canyon in Arizona. Then it heads outbound at about 7,000 mph before disappearing at the radar’s maximum range at 224 miles (near Marble Canyon, Arizona). The target responds to encrypted military IFF transponder signals and transmits encrypted responses. [Eberhart]
Record Card:
Disposition Form:
Handwritten Memo:
Radar UFO Report Conclusions to Capt. Gregory:
Telex:
Sources:
Brad Sparks, Blue Books Unknowns Catalogue, Case 1237, p. 244;
Jerome Clark, The UFO Encyclopedia, 3rd Ed., p. 997;
Jerome Clark, The UFO Encyclopedia, 4th Ed., p. 1110;
Robert Powell, UFOs: A Scientist Explains What We Know (And Don’t Know), 2024, p. 92;
NICAP, “6200 MPH Target Hovers near Grand Canyon”;