Tomo-e Gozen is an optical wide-field video observation system composed of a mosaic CMOS camera on the 1.05 m Kiso Schmidt telescope, real-time data analysis software, and automated operation software. Consecutive images at 2 fps with a field-of-view of 20 deg2 are obtained with 84 chips of CMOS image sensors. Produced data of 30 TByte/night are processed by advanced data science methods in real time. A high-speed data acquisition capability of CMOS image sensor enables a quick scan of the sky as well as a high-speed monitoring with sub-sec time resolution. Monochromatic all-sky video-survey of 7,000 deg2 and high-cadence video-survey of 2,000 deg2 are now ongoing. When receiving alerts of gravitational wave events, automated follow-up observations of a few 100 deg2 start quickly. The high-speed observation capability with precise timestamps achieved by GPS allows us to carry out simultaneous monitoring of short time-scale variables with X-ray and radio telescopes. The high-speed, high-cadence, and wide-field observations with Tomo-e Gozen will open new windows for astronomy on short time-scale phenomena including faint meteors, near-earth asteroids, stellar occultations, early-phase supernovae, black hole binaries, optical counterparts of gravitational wave sources and FRBs, and unknown flashes in the Universe.


FACILITY

Kiso Schmidt telescope
Kiso Schmidt telescope

Wide-field telescope (Deff = 1.05 m, f/3.1)

Tomo-e Gozen camera
Tomo-e Gozen camera

Wide-field CMOS camera covering 20 deg2 sky.


TECHNICAL FEATURES

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Wide field

20 deg2 sky covered by 190 Mpix CMOS camera

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High speed

2 fps (max) in full-frame, 160 fps (max) in partial-frame

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High time accuracy

Absolute time accuracy of 0.2 msec achieved by GPS

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Big data

30 TB every night, processed by advanced data science methods


OBSERVATIONS

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Video survey

18 frames at 2 fps, 17 mag depth per frame

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Quick scan

7,000 deg2 sky (elv > 35 deg) in 2.5 hours

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Multimessenger

Quick follow-ups of gravitational wave and cosmic neutrino events

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Simultaneous monitoring

High-speed observations with X-ray and radio telescopes


SCIENCE TARGETS

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Fast moving objects

Near earth asteroids, faint meteors, artificial satellites, space debris

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Transients

Early phase supernovae, optical counterparts of gravitational waves, stellar flares, transit of exoplanets, outbursts of comets

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Sec-to-msec scale events

Blackhole binaries, dwarf novae, spinning compact objects, stellar occultations by the Kuiper belt objects

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Flashes

Optical counterparts of gamma-ray bursts and FRBs, unknown flash events.


CONTACT US

Address

Kiso Observatory, Institute of Astronomy, School of Science, the University of Tokyo

10762-30, Mitake, Kiso-machi, Kiso-gun, Nagano 397-0101, Japan


E-mail

tomoegozen-prjioa.s.u-tokyo.ac.jp


ORGANIZATION