Presentation Information
[R5-13]Physical Property Measurements of Returned Samples from Planetary Exploration: From Hayabusa2 to Future Missions
*Satoshi Tanaka1, Keisuke Onodera2, Takuya Ishizaki1 (1. Institute of Space and Astronautical Science, 2. Institute for Planetary Materials Okayama University)
Keywords:
Sample Return,Hayabusa2,Physical Property Measurements
Sample return missions provide a unique opportunity to directly investigate extraterrestrial materials using state-of-the-art analytical techniques available on Earth. In addition to mineralogical and chemical analyses, measurements of physical properties—including density, porosity, elastic wave velocity, mechanical strength, thermal properties, electrical properties, and magnetic properties—provide essential constraints for understanding the physical processes that governed the formation and evolution of planetary bodies.
The samples returned from asteroid Ryugu by the Hayabusa2 mission represent the world's first comprehensive physical property measurements of carbonaceous asteroid materials. Prior to sample return, an interdisciplinary physical property measurement team was established to develop analytical techniques applicable to the extremely limited amount of returned material. As a result, sixteen physical properties in four categories—mechanical, thermal, electrical, and magnetic—were successfully measured. These measurements not only verified interpretations derived from remote-sensing observations, such as thermal inertia and surface mechanical properties, but also led to new insights into the surface evolution of Ryugu, including the possible contribution of fine-grained regolith to its thermal and mechanical characteristics. Furthermore, the measured physical properties have provided fundamental input parameters for numerical simulations of asteroid formation, impact processes, and thermal evolution, thereby serving as an important bridge between spacecraft observations and theoretical models.
Planetary sample return missions are now expanding beyond near-Earth asteroids to include the Martian moons, comets, and the icy satellites of the outer planets. In these future missions, integrated analyses combining mineralogy, geochemistry, and physical property measurements will become increasingly important for maximizing the scientific value of the limited returned samples. Moreover, integrating laboratory measurements of returned samples with remote-sensing observations and in situ physical measurements will enable local sample-scale information to be extrapolated to the scale of entire planetary bodies, providing a new framework for planetary science.
In this presentation, we will review the physical property measurements performed on the Hayabusa2 Ryugu samples and discuss how these results have contributed to planetary materials science. We will also present future prospects for the role of physical property measurements in upcoming sample return missions and their integration with in situ exploration techniques.
The samples returned from asteroid Ryugu by the Hayabusa2 mission represent the world's first comprehensive physical property measurements of carbonaceous asteroid materials. Prior to sample return, an interdisciplinary physical property measurement team was established to develop analytical techniques applicable to the extremely limited amount of returned material. As a result, sixteen physical properties in four categories—mechanical, thermal, electrical, and magnetic—were successfully measured. These measurements not only verified interpretations derived from remote-sensing observations, such as thermal inertia and surface mechanical properties, but also led to new insights into the surface evolution of Ryugu, including the possible contribution of fine-grained regolith to its thermal and mechanical characteristics. Furthermore, the measured physical properties have provided fundamental input parameters for numerical simulations of asteroid formation, impact processes, and thermal evolution, thereby serving as an important bridge between spacecraft observations and theoretical models.
Planetary sample return missions are now expanding beyond near-Earth asteroids to include the Martian moons, comets, and the icy satellites of the outer planets. In these future missions, integrated analyses combining mineralogy, geochemistry, and physical property measurements will become increasingly important for maximizing the scientific value of the limited returned samples. Moreover, integrating laboratory measurements of returned samples with remote-sensing observations and in situ physical measurements will enable local sample-scale information to be extrapolated to the scale of entire planetary bodies, providing a new framework for planetary science.
In this presentation, we will review the physical property measurements performed on the Hayabusa2 Ryugu samples and discuss how these results have contributed to planetary materials science. We will also present future prospects for the role of physical property measurements in upcoming sample return missions and their integration with in situ exploration techniques.