The University of Tokyo · Physics and Astronomy
Professor Eri Tatsumi's research lab specializes in planetary science, with a focus on the surface composition, photometric properties, and thermal evolution of primitive asteroids. The lab investigates carbonaceous and primitive near-Earth asteroids using remote-sensing data from space missions such as Hayabusa2 and OSIRIS-REx, emphasizing the identification of hydrated minerals, organics, and exogenic materials. By combining telescopic observations with in-situ measurements, the lab aims to understand the processes of space weathering and the preservation of pristine materials from the early inner solar system. Their work contributes to unraveling the origins of primitive bodies and the delivery of water and organics to Earth.
Figures are computed from collected data and may differ slightly.
Context. The Hayabusa2 spacecraft launched by Japan Aerospace Exploration Agency has been conducting observations of the asteroid (162173) Ryugu since June 2018. The Telescopic Optical Navigation Camera (ONC-T) onboard Hayabusa2 has obtained thousands of images under a variety of illumination and viewing conditions. Aims. Our objective is to examine and validate the camera calibration, derive a photometric correction for creating global albedo maps, and to interpret the photometric modeling resu
Ryugu is a carbonaceous rubble-pile asteroid visited by the Hayabusa2 spacecraft. Small rubble pile asteroids record the thermal evolution of their much larger parent bodies. However, recent space weathering and/or solar heating create ambiguities between the uppermost layer observable by remote-sensing and the pristine material from the parent body. Hayabusa2 remote-sensing observations find that on the asteroid (162173) Ryugu both north and south pole regions preserve the material least proces
ABSTRACT Using the multiband imager MapCam on board the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) spacecraft, we identified 77 instances of proposed exogenic materials distributed globally on the surface of the B-type asteroid (101955) Bennu. We identified materials as exogenic on the basis of an absorption near 1 $\mu$m that is indicative of anhydrous silicates. The exogenic materials are spatially resolved by the telescopic camera Po
Context. Spectrophotometry data of asteroids obtained in the 1980s showed that there are large variations in their near-ultraviolet (NUV) reflectance spectra. Reflectance spectra at NUV wavelengths are important because they help detect the presence of hydrated minerals and organics on the asteroid surfaces. However, the NUV wavelength region has not been fully investigated yet using spectroscopic data. Aims. The aim of our study is to obtain the near-ultraviolet to visible (NUV-VIS, 0.35–0.95 μ
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