The University of Tokyo Atacama 1.0-m telescope

Takeo Minezaki, Daisuke Kato, Shigeyuki Sako, Masahiro Konishi, Shintaro Koshida, Natsuko Mitani, Tsutomu Aoki, Mamoru Doi, Toshihiro Handa, Yoshifusa Ita, Kimiaki Kawara, Kotaro Kohno, Takashi Miyata, Kentaro Motohara, Takao Soyan, Toshihiko Tanab́e, Masuo Tanaka, Ken'ichi Tarusawa, Yuzuru Yoshii, Leonardo BronfmanMaria T. Ruiz, Mario Hamuy

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

21 Citations (Scopus)


We present the current status of the University of Tokyo Atacama 1.0-m telescope constructed at the summit of Co. Chajnantor (5,640 m) in Atacama, Chile, which is an optical/infrared telescope at the world's highest site. The telescope is an f/12 Ritchey-Chretien type with a field of view of 10 arcmin. It is installed in a 6-m dome and is controlled from the operation room in a container separated from the dome. The engineering first light observation was carried out in March 2009, and the astronomical observations have been carried out since June 2009. The pointing of the telescope is as accurate as 2.4 arcsec (RMS), showing good tracking accuracy of 0.2 arcsec for 60-s observation without guiding. The Hartmann constant is 0.19 arcsec and the image quality of the telescope is satisfactory for scientific observations. The best PSF obtained is 0.5 arcsec (FWHM) in optical, which demonstrates that the summit of Co. Chajnantor is one of the best seeing site in the world. Also the excellent atmospheric transmission in infrared wavelength at the site is proved by successful observations carried out by the ANIR near-infrared camera and the MAX38 mid-infrared instrument. In the near future, the operation room will be connected to the base support facility at San Pedro de Atacama for remote observation.

Original languageEnglish
Title of host publicationGround-Based and Airborne Telescopes III
EditionPART 1
Publication statusPublished - 2010
EventGround-Based and Airborne Telescopes III - San Diego, CA, United States
Duration: 2010 Jun 272010 Jul 2

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
NumberPART 1
ISSN (Print)0277-786X


ConferenceGround-Based and Airborne Telescopes III
Country/TerritoryUnited States
CitySan Diego, CA


  • Atacama
  • Co. Chajnantor
  • High altitude
  • Mid infrared
  • Near infrared
  • Remote observation
  • Telescope


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