FMOS: The fibre multi-object spectrograph VII results of PIR engineering run

Masahiko Kimura, Toshinori Maihara, Fumihide Iwamuro, Masayuki Akiyama, Naoyuki Tamura, Naruhisa Takato, Kouji Ohta, Shigeru Eto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Fibre Multi-Object Spectrograph (FMOS) is the next common-use instrument of Subaru Telescope. FMOS consists of three subsystems; the Prime focus unit for Infrared (PIR), the fibre positioning system/connector units, and the two infrared spectrographs. The PIR was transferred to the Subaru Observatory in the spring of 2005 to check the optical performance on the telescope. As a result of the test observation, we found that the adjustment of the optical axis between PIR and the primary mirror was difficult with the initial design of the corrector alignment stage. Furthermore, the optical axis of the telescope moved over a little owing to an earthquake in Hawaii Island in Oct. 2006. Therefore we decided to modify mechanical structure of PIR, the corrector alignment stage as well as the cable wrapping system. This modification was completed in the summer of 2007. In this proceeding, we report the mechanical structure of the new PIR and the results of the engineering observations.

Original languageEnglish
Title of host publicationGround-based and Airborne Instrumentation for Astronomy II
Publication statusPublished - 2008
Externally publishedYes
EventGround-based and Airborne Instrumentation for Astronomy II - Marseille, France
Duration: 2008 Jun 232008 Jun 28

Publication series

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


OtherGround-based and Airborne Instrumentation for Astronomy II


  • Near infrared
  • Prime focus
  • Spectrograph
  • Subaru telescope

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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