Reentry & Infrasound Research
OSIRIS-REx's sonic trail calibrates high-altitude object detection
Thirty-nine infrasound stations turn a known capsule reentry into a benchmark for estimating the energy of hypersonic sources.
Briefed September 17, 2026 · Aliens in the Clouds
Peer Reviewed · Single-Event Calibration
A peer-reviewed analysis used infrasound recorded during the OSIRIS-REx sample capsule's September 24, 2023 reentry as a controlled hypersonic source. Measurements from 39 stations traced the shock over source altitudes of 44 to 62 kilometers and allowed the researcher to infer blast radii without assuming one disputed normalization constant in advance.
The resulting median normalization agrees with two established blast-wave formulations, while a simple Mach-times-diameter approximation overestimated the blast radius by about 3.4 times. A period-based relation fit the event closely, but the author cautions that values changed systematically along the trajectory and require validation against more reentries. This calibrates a known human spacecraft, not an unidentified object.
Why it matters
Better infrasound calibration helps distinguish and characterize meteors, reentries, and other elevated fast-moving sources when visual data are incomplete.
What the source establishes
Peer-reviewed single-event calibration using a known NASA capsule and 39 stations. The method is useful identification context, not a UAP detection or proof of an unknown vehicle.
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