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The All-domain Anomaly Resolution Office of the U.S. Department of Defense issued this case resolution on February 6, 2025, with a technical appendix, on the "Go Fast" video recorded by a U.S. Navy F/A-18F FLIR sensor off Florida in January 2015. Working from the public 34-second video, AARO puts the object at about 13,000 feet, moving roughly 5 to 92 mph once wind is accounted for. It concludes with high confidence that the object showed no anomalous performance and that its apparent speed came from motion parallax.
“Go Fast”9 pages
UNCLASSIFIED 2 UNCLASSIFIED Determining the object’s true speed and direction of travel (heading) requires knowing the F/A- 18F’s heading. AARO calculated the object’s speed and heading relative to the aircraft because the video display does not contain the aircraft’s heading. AARO calculated the object’s position and direction of travel for the entire range of possible wind directions (0° - 360°) to account for differences in atmospheric conditions between the F/A-18F’s altitude and object’s altitude. This comprehensive modeling informed AARO’s assessment of whether the object moved with or against the wind and whether it behaved anomalously for all possible directions of travel. AARO factored in historical wind speeds and directions at both the object’s altitude (13,000 feet) and the aircraft’s altitude (25,000 feet), as measured near the time and location of the event: • At 13,000 feet, wind speed was 30.9 m/s (69 mph) from the west (265°). • At 25,000 feet, wind speed was 52 m/s (116 mph) from the west southwest (255°). Figure 1 shows the object’s range of possible speeds calculated while compensating for wind speed at 13,000 feet. This is considered the “intrinsic” speed. An intrinsic speed of 0 m/s indicates that the object is moving with the wind, or about 30.9 m/s. Figure 1: The y-axis represents the object’s speed with wind effects removed. The x-axis represents the wind’s heading relative to the F/A-18F’s airframe geometry (0° is a headwind). The curve represents the object’s range of speeds at each angle. The tailwind, headwind, and crosswind cases are denoted by the colored lines. The object’s lowest possible speed occurs near a headwind while the highest occurs in a tailwind. Figure 2 shows the object’s range of possible headings relative to the wind direction at 13,000 feet A direction of 0° indicates that the object is moving in the same direction as the wind.
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