In the days following, Blue Book’s scientific consultant J. Allen Hynek, received a personal request to investigate the sightings from fellow astronomer Gérard de Vaucouleurs at the McDonald Observatory in Austin, Texas. Against the wishes of Blue Book chief Maj. Hector Quintanilla, who wanted to avoid more publicity, Hynek met with de Valcoulers, and later interviewed Bob Campbell on-location. For comparison, he asked Campbell to provide several tests with the same camera and film, including time-exposures of the night sky, Venus, and a bright street light at an known distance. An examination of the original negatives by Air Force scientific advisors determined no reason to suspect a hoax. They also determined that the large luminous source moved up and down against a constant background in which faint star trails were evident.