Arai, T., Okada, T., Tanaka, S., Fukuhara, T., Demura, H., … , Senshu, H. et al.(2021), Geometric correction for thermographic images of asteroid 162173 Ryugu by TIR (thermal infrared imager) onboard Hayabusa2. Earth Planets Space 73, 115.

Azzam, Y. A., Elnagahy, F. I. Y., Ali, G. B., Essam, A., Saad, S., …, Akitaya, H. et al. (2021), Kottamia Faint Imaging Spectro-Polarimeter (KFISP): opto-mechanical design, software control and performance analysis, Experimental Astronomy 53, 1–26.

Benkhoff, J. , Murakami, G., Baumjohann, W., Besse, S., Bunce, M., … , Kobayashi, M. et al. (2021), BepiColombo – Mission Overview and Science Goals, Space Science Reviews 217, 90.

Chang, C. -K., Chen, Y. -T., Fraser, W. C., Yoshida, F., Lehner, J. et al. (2021), FOSSIL. I. The Spin Rate Limit of Jupiter Trojans, The Planetary Science Journal 2, 191.

Cho, Y., Morota, T., Kanamaru, M., Takaki, N., Yumoto, K., …, Yamada, M. et al. (2021), Geologic History and Crater Morphology of Asteroid (162173) Ryugu, Journal of Geophysical Research: Planets 126 , e2020JE006572.

Hasegawa, Y., Suzuki, T. K., Tanaka, H., Kobayashi, H. & Wada, K. (2021), Collisional Growth and Fragmentation of Dust Aggregates with Low Mass Ratios. I: Critical Collision Velocity for Water Ice, The Astrophysical Journal 915, 22.

Hirabayashi, M., Mimasu, Y, Sakatani, N., Watanabe, S., Tsuda, Y., … , Kikuchi, S., … , Senshu, H., … , Hirai, T. et al. (2021), Hayabusa2 extended mission: New voyage to rendezvous with a small asteroid rotating with a short period, Advances in Space Research 68, 1533–1555.

Hirata, N., Namiki, N., Yoshida, F., Matsumoto, K., Noda, H., Senshu, H. et al. (2021), Rotational effect as the possible cause of the east-west asymmetric crater rims on Ryugu observed by LIDAR data, Icarus 354, 114073.

Honda, R., Arakawa, M., Shimaki, Y., Shirai, K., Yokota, Y., … , Wada, K., … , Ishibashi, K., … , Yamada, M. et al. (2021), Resurfacing processes on asteroid (162173) Ryugu caused by an artificial impact of Hayabusa2’s Small Carry-on Impactor, Icarus 366, 114530.

Imazato, F., Sasada, M., Uemura, M., Fukazawa, Y., Takahashi, H., … , Akitaya, H.  et al. (2021), Origins of the Long-term Variability of the Near-infrared Emission of the Black Hole X-Ray Binary GRS 1915+105 in the X-Ray Low Luminous State, The Astrophysical Journal 916, 114.

Janches, D., Berezhnoy, A. A., Christou, A. A., Cremonese, G., Hirai, T. et al. (2021), Meteoroids as One of the Sources for Exosphere Formation on Airless Bodies in the Inner Solar System, Space Science Reviews 217, 50.

Kameda, S., Yokota, Y., Kouyama, T., Tatsumi, E., Ishida, M., …, Yamada, M., …, Sugita, S. (2021), Improved method of hydrous mineral detection by latitudinal distribution of 0.7-μm surface reflectance absorption on the asteroid Ryugu, Icarus 360, 114348.

Kameda, S., Ozaki, M., Enya, K., Fuse, R., Kouyama, T., … , Hong, P., Ishibashi, K. et al. (2021), Design of telescopic nadir imager for geomorphology (TENGOO) and observation of surface reflectance by optical chromatic imager (OROCHI) for the Martian Moons Exploration (MMX), Earth Planets Space 73, 218.

Kanamaru, M., Sasaki, S., Morota, T., Cho, Y., Tatsumi, E., … , Senshu, H. et al.  (2021), YORP Effect on Asteroid 162173 Ryugu: Implications for the Dynamical History, Journal of Geophysical Research Planets 126, e2021JE006863.

Kawabata, Y., Wada, Y., Yasuda, T., Kato, R., Kato, N., et al.(2021) Influence of Chemical Composition on Physical Properties of Low-Melting-Point Thermoplastics for Hybrid Rocket Fuel. Transactions Jpn Soc Aeronautical Space Sci Aerosp Technology Jpn 19, 238–244 (2021).

Kawabata, Y., Wada, Y., Nagase, R., Yasuda, T., Kato, N., Matsui, T. et al. (2021), Viscoelastic behavior and structural feasibility analysis of low-melting-point thermoplastic fuel for hybrid rockets, International Journal of Energetic Materials and Chemical Propulsion 21, 47–72.,569acf27247a762c,21c3b7fc67bf7882.html

Kikuchi, S., Ogawa, N., Mori, O., Saiki, T., Takei, Y., …, Yamada, M., …, Sugita, S., et al. (2021), Ballistic deployment of the Hayabusa2 artificial landmarks in the microgravity environment of Ryugu, Icarus, 358, 114220. 

Kikuchi, S., Oki, Y., and Tsuda, Y. (2021), Frozen Orbits Under Radiation Pressure and Zonal Gravity Perturbations, Journal of Guidance, Control, and Dynamics 44, 1924–1946.

Kikuchi, S., Saiki, T., Takei, Y., Terui, F., Ogawa, N., … , Yamada, M., … , Wada, K. et al. (2021), Hayabusa2 pinpoint touchdown near the artificial crater on Ryugu: Trajectory design and guidance performance, Advances in Space Research 68, 3093–3140.

Kitazato, K., Milliken, R. E., Iwata, T., Abe, M., Ohtake, M., …, Senshu, H., …, Arai, T., …, Wada, K., …, Yamada, M., et al. (2021), Thermally altered subsurface material of asteroid (162173) Ryugu, Nature Astronomy 5, 246–250.

Kouyama, T., Tatsumi, E., Yokota, Y., Yumoto, K., Yamada, M., …, Sugita, S. (2021), Post-arrival calibration of Hayabusa2’s optical navigation cameras (ONCs): Severe effects from touchdown events, Icarus, 360, 114353. 

Krüger, H., Kobayashi, M., Strub, P., Klostermeyer, G.-M., Sommer, M., Kimura, H., et al. (2021), Modelling cometary meteoroid stream traverses of the Martian Moons eXploration (MMX) spacecraft en route to Phobos, Earth Planets Space, 73, 93. 

Kuroda, D., Geem, J., Akitaya, H., Takahashi, J., Takahashi, K. et al. (2021), Implications of High Polarization Degree for the Surface State of Ryugu, The Astrophysical Journal Letters 911, L24.

Kurosawa, K., Genda, H., Azuma, S. & Okazaki, K. (2021), The role of post-shock heating by plastic deformation during impact devolatilization of calcite (CaCO3), Geophysical Research Letters, 48, e2020GL091130.

Kurosawa, K., Moriwaki, R., Yabuta, H., Ishibashi, K., Komatsu, G., and Matsui, T. (2021), Ryugu’s observed volatile loss did not arise from impact heating alone, Communications Earth & Environment 2, 146.

Lee, Y. J., Munoz, A. G., Yamazaki, A., Yamada, M., et al. (2021), Investigation of UV Absorbers on Venus Using the 283 and 365 nm Phase Curves Obtained From Akatsuki, Geophysical Research Letters 48, e2020GL090577. 

Maeda, N., Terai, T., Ohtsuki, K., Yoshida, F., Ishihara, K. et al. (2021), Size Distributions of Bluish and Reddish Small Main-belt Asteroids Obtained by Subaru/Hyper Suprime-Cam, The Astronomical Journal 162, 280.

Mangano, V., Doza, M., Fränz, M., Milillo, A., Oliveira, J. S., …, Hirai, T., …, Kobayashi, M., et al. (2021), BepiColombo Science Investigations During Cruise and Flybys at the Earth, Venus and Mercury, Space Science Review 217, 23. 

Matsumoto, K., Hirata, N., Ikeda, H., Kouyama, Senshu, H. et al. (2021), MMX geodesy investigations: science requirements and observation strategy, Earth Planets Space 73, 226.

Miyamoto, H., Niihara, T., Wada, K., Ogawa, K., Senshu, H., … , Hong, P. K. et al. (2021), Surface environment of Phobos and Phobos simulant UTPS, Earth, Planets and Space 73, 214.

Nagaashi, Y., Nakamura, A. M., Hasegawa, S. & Wada, K. (2021), Packing fraction of clusters formed in free-falling granular streams based on flash x-ray radiography, Physical Review E 103, 032903. 

Nakamura, T., Ikeda, H., Kouyama, T., Nakagawa, H., Kusano, H., Senshu, H., … , Kobayashi, M., … , Wada, K. et al. (2021), Science operation plan of Phobos and Deimos from the MMX spacecraft, Earth, Planets and Space 73, 227. 

Nakamura, Y., Takayanagi, T., Uesaka, T., Unlu, M. B., Kuriyama, Y., … , Kobayashi, M. et al. (2021), Technical Note: Range verification of pulsed proton beams from fixed‐field alternating gradient accelerator by means of time‐of‐flight measurement of ionoacoustic waves, Medical Physics 48, 5490–5500. 

Nakaoka, T., Maeda, K., Yamanaka, M., Tanaka, M., Kawabata, M., … , Akitaya, H. et al. (2021), Calcium-rich Transient SN 2019ehk in a Star-forming Environment: Yet Another Candidate for a Precursor of a Double Neutron-star Binary, The Astrophysical Journal 912, 30.

Nakazawa, K., Okuzumi, S., Kurosawa, K., and Hasegawa, S. (2021), Modeling Early Clustering of Impact-induced Ejecta Particles Based on Laboratory and Numerical Experiments, The Planetary Science Journal 2, 237.

Niihara, T., Yokoyama, T., Arai, T., Misawa, K., and Goodrich, C. (2021), Petrology and mineralogy of an igneous clast in the Northwest Africa 1685 (LL4) chondrite: Comparison with alkali‐rich igneous clasts in LL‐chondritic breccias, Meteoritics & Planetary Science 56, 1619–1625. 

Noda, H., Senshu, H., Matsumoto, K., Namiki, N., Mizuno, T., Sugita, S., …, Yamada, M., et al. (2021) Alignment determination of the Hayabusa2 laser altimeter (LIDAR), Earth Planets Space, 73, 21. 

Noguchi, R., Hirata, N, Hirata, N.,  Shimaki, Y., Nishikawa, N., …, Sugita, S., …, Yamada, M., et al. (2021) Crater depth-to-diameter ratios on asteroid 162173 Ryugu, Icarus354, 114016.

Okada, T., Tanaka, S., Fukuhara, T., Arai, T., Imamura, T., … , Senshu, H. et al. (2021), (Ed.) S. Murakami, (Ed.) Y. Yamamoto, (Ed.) M. K. Crombie, (Ed.) Y. Ishihara, PDS4 Hayabusa2 TIR Bundle, JAXA Data Archives and Transmission System,

Sakatani, N., Tanaka, S., Okada, T., Fukuhara, T., Riu, L., … , Senshu, H., … , Wada, K., … , Ishibashi, K. … , Kikuchi, S. et al. (2021), Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body, Nature Astronomy 5, 766–774.

Sasada, M., Utsumi, Y., Itoh, R., Tominaga, N., Tanaka, M., … , Akitaya, H. et al. (2021), J-GEM optical and near-infrared follow-up of gravitational wave events during LIGO’s and Virgo’s third observing run, Progress of Theoretical and Experimental Physics 2021, 05A104.

Sato, M., Kurosawa, K., Kato, S., Ushioda, M., and Hasegawa, S. (2021), Shock Remanent Magnetization Intensity and Stability Distributions of Single‐Domain Titanomagnetite‐Bearing Basalt Sample Under the Pressure Range of 0.1–10 GPa. Geophysical Research Letters 48, e2021GL092716.

Senshu, H., Mizuno, T., Umetani, K., Nakura, T., Konishi, A. et al. (2021), Light detection and ranging (LIDAR) laser altimeter for the Martian Moons Exploration (MMX) spacecraft. Earth Planets Space 73, 219.

Shoyama, T., Banno, A., Furutam, Y., Kurata, N., Ode, D., Wada, Y., and Matsui, T. (2021), Air-Launch Experiment Using Suspended Rail Launcher for Rockoon, Aerospace 8, 289.

Shoyama, T., Wada, Y., and Matsui, T. (2021), Conceptual Study on Low-Melting-Point Thermoplastic Fuel/Nitrous Oxide Hybrid Rockoon, Journal of Spacecraft and Rockets 59, 1–9.

Sugimoto, C., Tatsumi, E., Cho, Y., Morota, T., Honda, R., … , Yamada, M. et al. (2021), High-resolution observations of bright boulders on asteroid Ryugu: 1. Size frequency distribution and morphology, Icarus 369, 114529.

Sugimoto, C., Tatsumi, E., Cho, Y., Morota, T., Honda, R., … , Yamada, M. et al. (2021), High-resolution observations of bright boulders on asteroid Ryugu: 2. Spectral properties, Icarus 369, 114591.

Suzuki, A. I., Fujita, Y., Harada, S., Kiuchi, M., Koumoto, Y., …, Kurosawa, K., …, Hirai, T., …, Ishibashi, K. (2021), Experimental study concerning the oblique impact of low- and high-density projectiles on sedimentary rocks, Planetary and Space Science 195, 105141.

Takechi, S., Fujita, S., Konishi, N., Miyachi, T., Kobayashi, M., Okudaira, O., et al. (2021), Effect of high-energy heavy-ion irradiation on electromechanical coupling factor of piezoelectric lead zirconate titanate, Japanese Journal of Applied Physics60, 038003. 

Tanabe, N., Cho, Y., Tatsumi, E., Ebihara, T., Yumoto, K., … , Yamada, M. et al. (2021), Development of image texture analysis technique for boulder distribution measurements: Applications to asteroids Ryugu and Itokawa. Planetary and Space Science 204, 105249. 

Tatsumi, E., Sugimoto, C., Riu, L., Sugita, S., Nakamura, T., …, Yamada, M., Namiki, N., …, Wada, K., et al. (2021), Collisional history of Ryugu’s parent body from bright surface boulders, Nature Astronomy5, 39–45. 

Wada, K., Ishibashi, K., Kimura, H., Arakawa, M., Sawada, H., et al. (2021), Size of particles ejected from an artificial impact crater on asteroid 162173 Ryugu, Astronomy & Astrophysics, 647, A43. 10.1051/0004-6361/202039777

Wakamatsu, Y., Thrstensen, J. R., Kojiguchi, N., Isogai, K., Kimura, M., … , Akitaya, H. et al. (2021), ASASSN-18aan: An eclipsing SU UMa-type cataclysmic variable with a 3.6-hr orbital period and a late G-type secondary star, Publications of the Astronomical Society of Japan 73, 1209–1224.

Yanagisawa, M., Uchida, Y., Kurihara, S., Abe, S., Fuse, R., … , Yoshida, F. et al. (2021) Low dispersion spectra of lunar impact flashes in 2018 Geminids. Planetary and Space Science 195, 105131.

Yoshida, F., Ishimaru, R., Okudaira, O., Ishibashi, K., Hong, P. K., Matsui, T., and Kim, M. -J. (2021), Photometric observations of the potentially hazardous asteroid (99942) Apophis from Kawabe Cosmic Park, Publications of the Astronomical Society of Japan 73, L13–L17.