Dr. Kei Sano Profile

Dr. Kei Sano

at Kyushu Institute of Technology

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 23 August 2024 Presentation + Paper

The cosmic infrared background experiment 2 (CIBER-2): status of recent flights

Shuji Matsuura, James Bock, Asantha Cooray, Candice Fazar, Richard Feder, Ryo Hashimoto, Grigory Heaton, Viktor Hristov, Yuya Kawano, Phillip Korngut, Dae-Hee Lee, Chika Matsumi, Dale Mercado, Shunsuke Nakagawa, Tomoya Nakagawa, Shuta Nakahata, Chi Nguyen, Kazuma Noda, Dorin Patru, Won-Kee Park, Kei Sano, Aoi Takahashi, Kohji Takimoto, Momoko Tamai, Kohji Tsumura, Michael Zemcov

Proceedings Volume 13092, 130920V (2024) https://doi.org/10.1117/12.3017526

KEYWORDS: Telescopes, Rockets, Near infrared, Equipment, Infrared backgrounds

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Proceedings Article | 23 August 2024 Poster + Paper

VERTECS: operational and power management strategy

Shunsuke Nakagawa, Chinathip Narongphun, Zamba Leonel, Hari Ram Shrestha, Isami Kato, Emino Fukumoto, Rodrigo Cordova, Victor Hugo Schulz, Necmi Cihan Örger, Kei Sano, Takao Nakagawa, Kohji Takimoto, Shuji Matsuura, Kohji Tsumura, Aoi Takahashi, Daisuke Nakayama, Akimasa Ojika, Rin Sato, Keenan Alexsei Aamir Chatar, Yukihisa Otani, Ezra Fielding, Kentaro Hayashida, Hayato Tanaka, Eyoas Ergetu Areda, Bastien Bernard Andre Morelle, Hisataka Kawasaki, Umi Enokidani, Reynel Josué Galindo Rosales, Karaki Shohei, Ichiro Jikuya

Proceedings Volume 13092, 1309233 (2024) https://doi.org/10.1117/12.3017332

KEYWORDS: Astronomy, Extragalactic astronomy, Satellites, Solar cells, Power consumption, Visible radiation, X band, Batteries, Telescopes

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Proceedings Article | 23 August 2024 Poster + Paper

VERTECS: design and development of 6U CubeSat structure for observations of extragalactic background light

Hisataka Kawasaki, Eyoas Ergetu Areda, Hideo Matsuhara, Hirokazu Masui, Kohji Takimoto, Bastien Bernard Andre Morelle, Shuji Matsuura, Takao Nakagawa, Umi Enokidani, Yuki Hirose, Kei Sano

Proceedings Volume 13092, 1309232 (2024) https://doi.org/10.1117/12.3016648

KEYWORDS: Satellites, Vibration, Telescopes, Design

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Proceedings Article | 23 August 2024 Presentation + Paper

VERTECS: development status of the mission payload specialized in visible EBL observation

Kohji Takimoto, Yuki Hirose, Taiko Iwaki, Hisataka Kawasaki, Shuji Matsuura, Shunsuke Nakagawa, Takao Nakagawa, Akimasa Ojika, Rin Sato, Aoi Takahashi, Yuto Tome, Akane Tsumoto, Kohji Tsumura, Kei Sano

Proceedings Volume 13092, 130920X (2024) https://doi.org/10.1117/12.3016614

KEYWORDS: Astronomical imaging, Astronomical telescopes, Observational astronomy, Astronomical instrumentation, Telescopes, Baffles, Satellites, Optical filters

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Proceedings Article | 23 August 2024 Presentation + Paper

Astronomical 6U CubeSat mission VERTECS: scientific objective and project status

Kei Sano, Takao Nakagawa, Shuji Matsuura, Koji Takimoto, Aoi Takahashi, Tetsuhito Fuse, Rodrigo Cordova, Victor Schulz, Pooja Lepcha, Necmi Cihan Örger, Daisuke Nakayama, Joseph Ofosu, Reynel Josue Galindo Rosales, Eyoas Areda, Pema Zangmo, Ezra Fielding, Keenan Chatar, Yukihisa Otani, Hisataka Kawasaki, Bastien Morelle, John Paul Almonte, Shunsuke Nakagawa, Yuto Tome, Shohei Karaki, Chinathip Narongphun, Hari Ram Shrestha, Marco Rosa, David Dai, Wenceslao Bejarano, Akihiro Ikeda, Rin Sato, Kentaro Hayashida, Hiroki Miyagawa, Masahiro Nishioka, Kana Kurosaki, Isami Kato, Satoshi Ikari, Kohji Tsumura, Ichiro Jikuya, Hideo Matsuhara, Umi Enokidani, Hayato Tanaka, Yuki Hirose, Akimasa Ojika, Akane Tsumoto, Taiko Iwaki, Yuki Ohara, Mengu Cho, Kentaro Kitamura, Hirokazu Masui, Mariko Teramoto, Takashi Yamauchi, Ryo Hashimoto, Emino Fukumoto, Zamba Leonel, Arisa Oho, Shoki Yabumoto, Hayato Masuno, Chisato Arakawa, Kouta Miyamoto, Takehiko Wada, Naoki Isobe, Yasuyuki Miyazaki, Ryu Funase, Hajime Kawahara, Keiichi Hirako, Yoichi Yatsu, Yoshihide Aoyanagi

Proceedings Volume 13092, 130920W (2024) https://doi.org/10.1117/12.3014708

KEYWORDS: Satellites, Visible radiation, Galactic astronomy, Stars, Astronomy, Point spread functions, X band, Telescopes, Data transmission

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Proceedings Article | 23 August 2024 Presentation + Paper

VERTECS: thermal modeling and analysis to enhance mission efficiency through temperature control strategies of a 6U CubeSat with visible light telescope

Reynel Josué Galindo Rosales, Hisataka Kawasaki, Shohei Karaki, Marco Rosa, Ezra Fielding, Keenan Chatar, Shuji Matsuura, Yuki Hirose, Hirokazu Masui, Kei Sano, Takao Nakagawa, Mengu Cho

Proceedings Volume 13099, 1309910 (2024) https://doi.org/10.1117/12.3018823

KEYWORDS: Satellites, Telescopes, CMOS sensors, Thermal modeling, Visible radiation, Vacuum chambers, Vacuum, Cameras, Thermal effects, Device simulation

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Proceedings Article | 21 August 2024 Presentation + Paper

High-z gamma-ray bursts unraveling the dark ages and extreme space-time mission: HiZ-GUNDAM

Daisuke Yonetoku, Akihiro Doi, Tatehiro Mihara, Hideo Matsuhara, Takanori Sakamoto, Kohji Tsumura, Kunihito Ioka, Makoto Arimoto, Teruaki Enoto, Kenjiro Fujimoto, Hatsune Goto, Shuichi Gunji, Junko Hiraga, Shintaro Ikunaga, Nobuyuki Kawai, Ryuji Kondo, Shunsuke Kurosawa, Junyi Li, Yoshitomo Maeda, Ikuyuki Mitsuishi, Toshio Murakami, Issin Nagataka, Yujin Nakagawa, Naoki Ogino, Taiki Owari, Ryuji Sato, Masataka Sato, Tomoya Sato, Tatsuya Sawano, Motoko Serino, Hsien-Chieh Shen, Satoshi Sugita, Shuta Takahashi, Toru Tamagawa, Keisuke Tamura, Takaaki Tanaka, Toru Tanimori, Makoto Tashiro, Takumi Togashi, Hiroshi Tomida, Keito Watanabe, Kazutaka Yamaoka, Makoto Yamauchi, Yoichi Yatsu, Atsumasa Yoshida, Hiroshi Akitaya, Akihiko Fukui, Haruki Fukui, Yoshifusa Ita, Koji Kawabata, Shuji Matsuura, Akihiro Miyasaka, Kentaro Motohara, Norio Narita, Hirofumi Noda, Hirofumi Okita, Kei Sano, Keisuke Shinozaki, Sou Tajima, Yuji Urata, Takehiko Wada, Kenshi Yanagisawa, Michitoshi Yoshida, Nobutaka Bando, Ichiro Jikuya, Kenji Minesugi, Yasuyuki Miyazaki, Yusuke Kono, Naoki Takase, Shunichi Nakatsubo, Tooru Kaga, Katsuaki Asano, Kohei Inayoshi, Susumu Inoue, Hirotaka Ito, Hideyuki Izumiura, Norita Kawanaka, Tomoya Kinugawa, Shota Kisaka, Kenta Kiuchi, Koutarou Kyutoku, Jin Matsumoto, Akira Mizuta, Kohta Murase, Hiroki Nagakura, Shigehiro Nagataki, Yoshikazu Nakada, Takashi Nakamura, Yuu Niino, Yudai Suwa, Keitaro Takahashi, Takahiro Tanaka, Kenji Toma, Tomonori Totani, Ryo Yamazaki, Jun'ichi Yokoyama, Yuichi Harikane, Masaomi Tanaka, Shigeo Kimura, Mariko Kimura

Proceedings Volume 13093, 1309320 (2024) https://doi.org/10.1117/12.3018571

KEYWORDS: X-rays, Telescopes, Sensors, X-ray telescopes, Satellites, Physics, Near infrared, X-ray astronomy, X-ray imaging

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Proceedings Article | 25 July 2024 Presentation + Paper

VERTECS: A COTS-based payload interface board to enable next generation astronomical imaging payloads

Ezra Fielding, Victor Schulz, Keenan A. Chatar, Kei Sano, Akitoshi Hanazawa

Proceedings Volume 13101, 131010J (2024) https://doi.org/10.1117/12.3019471

KEYWORDS: Cameras, X band, Transmitters, Interfaces, Data transmission, Satellites, Design, Data communications, Astronomical imaging, Power consumption

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Proceedings Article | 19 October 2023 Presentation + Paper

Data downlink prioritization using image classification on-board a 6U CubeSat

Keenan A. Chatar, Ezra Fielding, Kei Sano, Kentaro Kitamura

Proceedings Volume 12729, 127290K (2023) https://doi.org/10.1117/12.2684047

KEYWORDS: Satellites, Education and training, Data modeling, Image classification, Image compression, Stars, Quantization, Electron beam lithography, Data transmission, Imaging systems

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Nanosatellites are proliferating as low-cost dedicated sensing systems with lean development cycles. Kyushu Institute of Technology (Kyutech) and collaborators have launched a joint venture for a nanosatellite mission, Visible Extragalactic background RadiaTion Exploration by CubeSat (VERTECS). The primary mission is to elucidate the formation history of stars by observing the optical-wavelength cosmic background radiation. The VERTECS satellite will be equipped with a small-aperture telescope and a high-precision attitude control system to capture the astronomical data for analysis on the ground. However, nanosatellites are limited by their onboard memory resources and downlink speed capabilities. Additionally, due to a limited number of ground stations, the satellite mission will face issues meeting the required data budget for mission success. To alleviate this issue, we propose an on-orbit system pipeline to autonomously classify and then compress desirable image data for downlink prioritization and optimization. The system comprises a prototype Camera Controller Board (CCB) which carries a Raspberry Pi Compute Module four which is used for classification and compression. The system uses a lightweight Convolutional Neural Network (CNN) model to classify and determine the desirability of captured image data. The model is designed to be lean and robust to reduce the computational and memory load on the satellite. The model is trained and tested on a novel star field dataset consisting of data captured by the Sloan Digital Sky Survey (SDSS). The dataset is meant to simulate the expected data produced by the 6U satellite. The compression step implements GZip, RICE or HCOMPRESS compression, which are standards for astronomical data. Preliminary testing on the proposed CNN model results in a validation classification accuracy of 100% on the star field dataset, with compression ratios of 3.99, 5.16 and 5.43 for GZip, RICE and HCOMPRESS that were achieved on tested FITS image data.

Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Pre-flight optical test and calibration for the Cosmic Infrared Background ExpeRiment 2 (CIBER-2)

Kohji Takimoto, Seung-Cheol Bang, Priyadarshini Bangale, James Bock, Asantha Cooray, Kenta Danbayashi, Richard Feder, Masaki Furutani, Kevin Gates, Ryo Hashimoto, Viktor Hristov, Arisa Kida, Phillip Korngut, Alicia Lanz, Dae-Hee Lee, Lunjun Liu, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Jodi-Ann Morgan, Chi Nguyen, Won-Kee Park, Dorin Patru, James Parkus, Shohta Sakai, Kei Sano, Hiroko Suzuki, Aoi Takahashi, Sohta Tatsu, Kohji Tsumura, Takehiko Wada, Shiang-Yu Wang, Yasuhiro Yamada, Michael Zemcov

Proceedings Volume 11443, 114435A (2020) https://doi.org/10.1117/12.2561917

KEYWORDS: Optical testing, Calibration, Infrared backgrounds, Optical calibration, Electron beam lithography, Galactic astronomy, Atmospheric optics, Rockets, Stars, Infrared radiation

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Proceedings Article | 13 December 2020 Presentation + Paper

Development of an optical and near-infrared telescope onboard the HiZ-GUNDAM mission

Kohji Tsumura, Daisuke Yonetoku, Koji Kawabata, Shuji Matsuura, Hirofumi Noda, Yuji Urata, Yuu Niino, Kei Sano, Akisato Ohashi, Akihiro Doi, Hiroshi Akitaya, Akihiro Miyasaka, Miku Kurimata, Yoshikatsu Kawata, Makoto Arimoto, Hirofumi Okita

Proceedings Volume 11443, 114430R (2020) https://doi.org/10.1117/12.2560654

KEYWORDS: Telescopes, Infrared telescopes, Optical instrument design, X-ray telescopes, Astronomy, Gamma radiation, X-rays, Satellites, Infrared detectors, Mirrors

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Development of EXo-Zodiacal Infrared Telescope (EXZIT) for observation of visible and near-infrared extragalactic background light

Kei Sano, Shuji Matsuura, Kohji Tsumura, Aoi Takahashi, Ryo Hashimoto, Sota Ogura, Kazuma Yomo, Hikoma Yasutake, Yuta Ino, Reina Tanaka

Proceedings Volume 11443, 114436B (2020) https://doi.org/10.1117/12.2559169

KEYWORDS: Electron beam lithography, Visualization, Space operations, Sensors, Mirrors, Infrared telescopes, Stars, Thermography, Aerospace engineering, Geometrical optics

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Extragalactic background light (EBL) consists of entire radiation emitted throughout the cosmic history and is one crucial observable quantity to study astrophysics in the early universe, such as first stellar objects or primordial black holes. In the visible and near-infrared, zodiacal light (ZL), sunlight scattered by interplanetary dust, is the brightest foreground for observer in the near-earth orbit and its uncertainty limits accuracy of the EBL measurement. To overcome this problem, observations from heliocentric distance beyond 5 au, where the ZL is negligible, is promising. To achieve the EBL observation in deep space, we have been developing EXo- Zodiacal Infrared Telescope (EXZIT) onboard a solar sail spacecraft to Jovian Trojans planned in Japan around 2030. According to our mission study, a three-mirror reflective telescope optics design with a 90mm × 50mm effective aperture and 16 deg × 8 deg field of view (FoV) followed by a focal plane array HAWAII-2RG with a linear variable filter makes available to detect the EBL at high significance in 0.4–1.6 μm with specific wavelength resolution of ∼ 20 . In the present study, we develop test optics to demonstrate optical performance in room temperature for the future observation. By adopting only mirrors of aspherical surface, we design the optics whose aberration is minimized to show point spread function (PSF) of approximately 3 pix × 3 pix on the focal plane. The mirrors are fabricated by machining aluminum alloy A6061 with a honeycomb processing on the back surface to reduce the mirror mass. After integrating and aligning the mirrors with support jigs, we measure the PSF on the focal plane by a visible camera by inserting collimated beam of different angle of incidence, covering the whole FoV. We evaluate the PSF size by analyzing encircled energy in comparison with that expected from the ray-trace simulation of the optics. Throughout the FoV of the optics, the measured PSF size is comparable to the simulation. The present study demonstrates the precision machining of the aspherical mirrors and the optical performance of the designed optics. As a next step, we plan to develop thermal structure of EXZIT to demonstrate the optical performance in low temperature.

Proceedings Article | 13 December 2020 Presentation + Paper

High-redshift gamma-ray burst for unraveling the Dark Ages Mission: HiZ-GUNDAM

Daisuke Yonetoku, Tatehiro Mihara, Akihiro Doi, Takanori Sakamoto, Kohji Tsumura, Kunihito Ioka, Yusuke Amaya, Makoto Arimoto, Teruaki Enoto, Takeru Fujii, Hatsune Goto, Shuichi Gunji, Junko Hiraga, Hirokazu Ikeda, Nobuyuki Kawai, Shunsuke Kurosawa, Jin Li, Yoshitomo Maeda, Ikuyuki Mitsuishi, Toshio Murakami, Yujin Nakagawa, Naoki Ogino, Masanori Ohno, Tatsuya Sawano, Kensyo Sei, Motoko Serino, Satoshi Sugita, Toru Tamagawa, Keisuke Tamura, Takaaki Tanaka, Toru Tanimori, Makoto Tashiro, Hiroshi Tomida, Hyeongsoon Wang, Tomohiro Yamaguchi, Ayumi Yamamoto, Kazutaka Yamaoka, Makoto Yamauchi, Yoichi Yatsu, Atsumasa Yoshida, Daito Yuhi, Hiroshi Akitaya, Akihiko Fukui, Yoshifusa Ita, Hidehiro Kaneda, Koji Kawabata, Yoshikatsu Kawata, Miku Kurimata, Toshio Matsumoto, Shuji Matsuura, Akihiro Miyasaka, Kentaro Motohara, Norio Narita, Hirofumi Noda, Akisato Ohashi, Hirofumi Okita, Kei Sano, Masaomi Tanaka, Yuji Urata, Takehiko Wada, Hikaru Yamaguchi, Kenshi Yanagisawa, Michitoshi Yoshida, Katsuaki Asano, Kohei Inayoshi, Susumu Inoue, Hirotaka Ito, Hideyuki Izumiura, Norita Kawanaka, Tomoya Kinugawa, Shota Kisaka, Kenta Kiuchi, Jin Matsumoto, Akira Mizuta, Kohta Murase, Hiroki Nagakura, Shigehiro Nagataki, Yoshikazu Nakada, Takashi Nakamura, Yuu Niino, Yudai Suwa, Keitaro Takahashi, Takahiro Tanaka, Kenji Toma, Tomonori Totani, Ryo Yamazaki, Jun'ichi Yokoyama

Proceedings Volume 11444, 114442Z (2020) https://doi.org/10.1117/12.2560603

KEYWORDS: Gamma radiation, Astronomy, X-ray optics, Satellite communications, Satellites, Observatories, X-ray detectors, X-ray telescopes, X-ray imaging, X-rays

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