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TIME/PLACE OF SIGHTING: April 24, 1961 at 3:34 A.M. local area time/over the Pacific Ocean in an aircraft flying at the position of 35°/50 minutes north latitude and 125°/40 minutes west longitude. radar-surveillance aircraft, with 18 1/2 years and 4,500 flying hours experience— a captain in the U.S. Air Force; and his navigator, a 1st Lieutenant with 4M years and 3,500 hours experience. TACTICS: The object appeared to be in orbit, like a satellite, and was first noted at a position of 29°/55 minutes elevation ona relative azimuth of 140°; it traversed the sky in the manner noted under COMMENT: The UFO resembled a planet in brightness. The Air Force investigator checked out its position and time with Space Track, the central tracking clearing house of the North American Air Defense Command, and was informed that the object could not be a satellite, since no satellite was in that position at that time. Furthermore, it was learned that if the object had been a satellite at the altitude of Echo I, its speed v was SO excessive that this possibility was ruled out. The UFO was first noticed by the navigator of the RC-121D aircraft because of its motion as he was taking a fix on the North Star through a sextant. Both observers were assigned to the 965th Aircraft Early Warning and Control Squadron, with headquarters at Mc-Clellan Air Force Base in California. DURATION: Eight minutes. NUMBER OF OBSERVERS: Two. TYPE OF OBSERVER: Aircraft Commander of an RC-121D (Lockheed Constellation) air-defense NUMBER OF OBJECTS: One. OBSERVER RELIABILITY: Excellent, in both cases. SHAPE: Round. DIMENSIONS: Size of a pin-head at arm's length. COLOR: Reddish white. SOUND: None. ALTITUDE: The aircraft was flying at 11,000 feet; the UFO's altitude was estimated as being "great." SPEED: Faster than the speed of the Echo I satellite moving across the sky. SPEED: it disappeared on the horizon at 50°.