Project 10073 Record — Sighting Report, Philadelphia, Pennsylvania, 12 October 1966

This document contains the Project Blue Book record for a UFO sighting reported in Philadelphia, Pennsylvania, on October 12, 1966. The primary witness, a National Guard member and associate member of NICAP, observed a blue-white object that he initially mistook for the Echo satellite. The witness reported that the object, which he compared to a mercury vapor street light, exhibited unusual movement, including side-to-side motion, stopping, shuddering, and an arcing flight path. The observation lasted approximately 25 minutes. The witness also noted that he contacted his fiancée, who, along with her two brothers, observed the same object. The witness reported a high volume of air traffic in the area during the observation period. The official Air Force conclusion for the incident was 'Aircraft (possible)', noting that while the Echo II satellite was in the area at 2340Z, it did not account for the entire duration of the sighting. The file includes the completed U.S. Air Force Technical Information questionnaire, a letter from Major Hector Quintanilla, Jr. requesting further information, and the witness's detailed narrative of the event.