[P-PS03] Small Solar System Bodies: New perspectives on the origin and evolution of the Solar System

[PPS03-08] Array Analysis of OSIRIS-REx's Shock Wave Using Portable Infrasound Sensors: A Comparative Study with HAYABUSA and HAYABUSA2.

*Yasuhiro Nishikawa¹, Masa-yuki Yamamoto¹, Yuta Hasumi² (1.Kochi University of Technology. School of System Engineering., 2.Kochi University of technology.)

Keywords:Sample return capsule, Infrasound, OSIRIS-REx, HAYABUSA2

The OSIRIS-REx asteroid probe, launched by the National Aeronautics and Space Administration (NASA) on September 8, 2016, reached the asteroid Bennu in 2018 and successfully collected surface rocks in 2020. Returning to Earth on September 24, 2023, OSIRIS-REx released the collected rocks encapsulated in the Sample Return Capsule (SRC). As the SRC re-entered Earth's atmosphere, it traversed over Nevada, generating a shock wave and landing in Utah. The Kochi University of Technology team, as part of the infrasound and seismic observation team, installed infrasound sensors and microphones at Eureka airport in Nevada to capture atmospheric pressure perturbations, including infrasonic and sound waves, produced by the SRC. Our efforts successfully detected infrasonic and sound waves generated by OSIRIS-REx at approximately 14:46 (UTC). Drawing from our past experience in observing HAYABUSA and HAYABUSA2 (Japan Aerospace Exploration Agency’s sample return mission), we utilized the same portable infrasound sensors for this investigation. In this presentation, we will share the outcomes of our OSIRIS-REx observations and draw comparisons with our earlier findings from studying HAYABUSA and HAYABUSA2.