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TACTICS: The UFO first appeared in the "belt" of Orion and moved in an arc toward the southwest, passing one degree south of Sirius before it fell below the horizon; according to the observers, during the sighting period there was no apparent change in either size, color or magnitude, the angular rate of change (an indication of speed) of the object appeared to increase from two degrees/one minute of arc in Orion to one degree/one second of arc just before it disappeared. COMMENT: The observers were viewing the nebula M-42 in Orion through a 48-power eyepiece on a six-inch-diameter Newtonian reflector telescope when they first saw the UFO. In the words of the Air Force officer: "We sensed we were seeing something extraordinary. The first 30 seconds we watched and debated the origin of the light. This was no aircraft. Then we checked the object's track. At first we thought it to be in a polar orbit - but on checking it with the celestial polar axis (on the telescope mount), an orbit near 45° appeared more reasonable. In a desperate effort I got the object in the narrow field of my telescope. Unfortunately, I did not get a good focus." Note: In order to change the field of his telescope, the observer had to change the eyepiece to one of shorter focal length and thus of higher power. The two observers watched the UFO both with the telescope and with the unaided eye. DURATION: Two-and-a-half minutes. NUMBER OF OBSERVERS: Two. TYPE OF OBSERVER: A major in the U.S. Air Force and an engineering field representative for Link - both amateur astronomers. NUMBER OF OBJECTS: One. OBSERVER RELIABILITY: Should be excellent. SHAPE: Could not be determined but was generally starlike. DIMENSIONS: Estimated that the object subtended an angle of five seconds of arc. COLOR: A reddish glow. SOUND: None. ALTITUDE: About 30° to 45° above the horizon. SPEED: Not estimated, but moved rapidly across a large portion of sky from the constellation of Orion to the bright star Sirius.