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Journal Articles

Thermally altered subsurface material of asteroid (162173) Ryugu

Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; et al.

Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03

 Times Cited Count:30 Percentile:96.87(Astronomy & Astrophysics)

Here we report observations of Ryugu's subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 $$^{circ}$$C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 $$^{circ}$$C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.

Journal Articles

Human interface of distributed plant monitoring and diagnosis system at "Monju"

Mizuno, Manabu*; Okusa, Kyoichi; Tamayama, Kiyoshi

Proceedings of International Symposium on Symbiotic Nuclear Power Systems for 21st Century (ISSNP) (CD-ROM), p.148 - 153, 2007/07

In the nuclear plants, it is required to detect an anomaly as early as possible and to inhibit adverse consequences. This requirement is especially important for the prototype Fast Breeder Reactor "Monju". Therefore, the monitoring and diagnosis system is required to be developed for "Monju" plant equipments. In these days, such a monitoring and diagnosis system can be realized using web technology with rationalized system resources due to remarkable progress of computer network technology. Then, we developed a platform based on web technology for the monitoring and diagnosis system of "Monju". Distributed architecture, standardization and highly flexible system structure have been taken account of in development. This newly developed platform and the prototype monitoring and diagnosis system have been validated. The system on the platform acquires "Monju" plant data and displays the data on client computers using "Monju" intranet with acceptable delay times.

Oral presentation

Application of correlational method to calibration of "Monju" sodium flow meter

Mizuno, Manabu*; Okusa, Kyoichi; Tamayama, Kiyoshi

no journal, , 

no abstracts in English

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