Research Interests

Origin of the Earth and life, exoplanets, star and planet formation, small bodies in the solar system, interstellar and interplanetary dust, unknown transient universe.


Development of optical wide-field cameras. Near and mid-infrared cameras and spectrometers. Remote and automatic observation system for ground-based telescopes.


Development of data acquisition system for large-format and high-speed array sensors. Evaluation of optical and infrared detectors. CMOS high-speed video sensors.

Advanced optics

Development of functional optical elements. Metal mesh wavelength-selective filter for infrared. Moth-eye antireflective coating for infrared. Sub-wavelength structure elements.

Informatics with big data

Acquisition of sky big data by optical video-sky-survey. Machine learning. Sparse modeling. Optimization. Advanced database. Real time data analysis system.

Social utilization and education

Utilization of big data of space debris, artificial satellites, and wide-field images obtained by the video-sky-survey. Actions towards SDGs with nature big data and high-speed network.


Core members

Shigeyuki Sako (Associate Professor) private web-site

Ryou Ohsawa (Project Assistant Professor)

Satoshi Takita (Project Researcher)

Jin Beniyama (D2)

Risa Tsutsuki (M1)

Keito Kurashima (B4)

Sorato Wada (B4)


Kiso Observatory group

The University of Tokyo Atacama Observatory (TAO) group


Yohei Nishino (graduated in 2021)


TAO 6.5-m Telescope

TAO 6.5-m Telescope

The University of Tokyo Atacama Observatory (TAO) project is to construct an infrared-optimized 6.5m telescope at the summit of Chajnantor (5640-m altitude) in northern Chile. The first light observation is scheduled in 2021.

Kiso Schmidt Telescope

Kiso Schmidt Telescope

The 105-cm Schmidt telescope is the main telescope of the Kiso Observatory, Institute of Astronomy, UTokyo in Nagano, Japan. This telescope has a wide field-of-view of 9-degrees and is controlled by a remote/automatic observation system.



MIMIZUKU is a mid-infrared instrument developed for the TAO 6.5-m telescope covering a wide wavelength range from 2 to 38 microns. Field Stacker unit mounted on MIMIZUKU realizes accurate calibration of variable atmospheric transmittance.

Tomo-e Gozen

Tomo-e Gozen

Tomo-e Gozen is an optical wide-field video observation system with a mosaic CMOS camera on the Kiso Schmidt telescope and intelligent observation software. It is capable to take consecutive images of 20 square degrees at 2-fps by 84 CMOS sensors.



1. Celebration of completion of the Tomo-e Gozen camera

You can enjoy by playing it together with the following video.

2. Tomo-e Gozen camera on the Kiso Schmidt telescope

3. YouTube channel

You can find other video contents related to Tomo-e Gozen on YouTube.


Buildings of Institute of Astronomy are located adjacent to the Mitaka campus of National Astronomical Observatory of Japan (NAOJ).
Access ways to the Mitaka campus by public transportation are described here.

2-21-1 Osawa, Mitaka, Tokyo, 181-0015, Japan

Room-2008 on the 2nd floor in the main building or rooms in the experimental building.


Institute of Astronomy, School of Science, The University of Tokyo

2-21-1 Osawa, Mitaka, Tokyo, 181-0015, Japan

Shigeyuki Sako

private web-site