Project Blue Book Case #985. On October 9, 1951, witnesses in Terre Haute, Indiana, observed a bright object in the sky above the city. The object's luminosity and behavior were inconsistent with conventional aircraft operating in the region.
Terre Haute sits on the Wabash River in western Indiana, a mid-sized industrial city that in 1951 was home to Hulman Field (now Terre Haute International Airport-Hulman Field), which served both civilian and military operations. The nearby Wabash River Ordnance Works and various defense-related industries in the region added to the area's military significance.
The October 1951 sighting occurred during an uptick in UFO activity that would contribute to the Air Force's decision to establish Project Blue Book in early 1952. The Fort Monmouth, New Jersey, radar incidents the previous month had alarmed military intelligence, and reports from across the country were being collected with increasing urgency.
Terre Haute's central position in the Midwest placed it along multiple commercial air routes, and witnesses were familiar with the appearance of aircraft at various altitudes. The bright object they reported did not correspond to any scheduled flights or known military operations in the area. Its sustained luminosity and controlled movement pattern distinguished it from meteors and atmospheric phenomena.
Blue Book investigators — working during the transitional period between Project Grudge and the formal establishment of Blue Book — found no conventional explanation. The case was classified "Unknown."