PROJECT 10073 RECORD CARD — 17 July 1957

This document is a Project 10073 record card and associated teletype report concerning a UFO sighting that occurred on July 17, 1957, in downtown New York City. At 1523 EST, a civilian clerk observed a single, circular, flat, white object that appeared to be the size of a basketball held at arm's length. The object was observed for less than one minute, moving in a straight line from east to west at a 45-degree angle. The observer noted that buildings obstructed the view. The report includes a teletype communication between various military units, including the 26th Air Division and the Air Technical Intelligence Center (ATIC). The investigation concluded that the object was a probable balloon. This conclusion was supported by data from the U.S. Weather Bureau, which confirmed that a radiosonde was launched at 1500 hours from 20th Street and Madison Avenue. While surface winds were from the south, winds above 6000 feet were from the north, providing a plausible explanation for the object's movement. The report explicitly notes that there were no other reports from the millions of people in the area, and the final assessment was that there was insufficient data for a more definitive analysis.