Tomo-e Gozen


Tomo-e Gozen is a wide-field CMOS mosaic camera installed in the 1.05-m Kiso Schmidt Telescope in Kiso Observatory, the University of Tokyo. The operation of the camera started on October 1st, 2019. The camera is equipped with 84 CMOS sensors, which cover a sky of about 20 deg².

Kiso Observatory conducts two types of surveys: an all-sky survey of 12,000 deg² and a high-cadence survey of 3,000 deg². Observations are carried out at 2 Hz. Thus, the original products of the surveys are video data, but only stacked two-dimensional images are publicly available. This archive provides images obtained in the surveys. The distributed images are science-ready; basic data reduction processes (dark subtraction, flat fielding, and astrometric calibration) are already applied with some exceptions.

Basic Specifications

The specifications of the telescope and camera are available here.


Data Format

The data are provided as two-dimensional FITS images. Details of the file format are available here.

Data Reduction

This archive provides science-ready images, where basic reduction processes (dark subtraction, flat fielding, and astrometric correction) are already applied. Calibration frames (dark and flat) are obtained before the start of observation every night. The Gaia catalog is used for astrometric calibration. Details of the reduction processes are available here.

Terms of Use

Cite the following paper(s) when you use the data obtained by Tomo-e Gozen in publications.

  1. Sako, S. et al. 2018, "The Tomo-e Gozen wide field CMOS camera for the Kiso Schmidt telescope", Proceedings of the SPIE, Volume 10702, id. 107020J 17 pp. (2018), DOI:10.1117/12.2310049