GREX-PLUS: Galaxy Reionization EXplorer and PLanetary Universe Spectrometer

Akio K. Inoue, Hidehiro Kaneda, Toru Yamada, Yuichi Harikane, Daisuke Ishihara, Tadayuki Kodama, Yutaka Komiyama, Takashi Moriya, Kentaro Motohara, Hideko Nomura, Masami Ouchi, Shinki Oyabu, Toyoaki Suzuki, Takehiko Wada, Issei Yamamura

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

1 Citation (Scopus)


GREX-PLUS (Galaxy Reionization EXplorer and PLanetary Universe Spectrometer) is a new mission concept for ISAS/JAXA's strategic L-class mission program in the 2030s. With a 1.2 m aperture, a 50 K cryogenic space telescope will have a > 1, 400 arcmin2 wide-field camera with 6 bands in the 2-10 µm wavelength range and a high-dispersion spectrometer with a wavelength resolution of > 30, 000 in the 10-18 µm band. The cryogenic infrared mission concept of GREX-PLUS is based on SPICA, exploiting the technical resources so far studied and developed, such as an active cooling system. The high-dispersion spectrometer of GREX-PLUS is based on the high-dispersion channel of the SPICA Mid-Infrared Instrument (SMI). The wide-field camera of GREX-PLUS is also based on previous concept studies for the ISAS/JAXA's WISH mission concept. GREX-PLUS is a concept proposal for a Japan-led mission but international collaborations are also welcome.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2022
Subtitle of host publicationOptical, Infrared, and Millimeter Wave
EditorsLaura E. Coyle, Shuji Matsuura, Marshall D. Perrin
ISBN (Electronic)9781510653412
Publication statusPublished - 2022
EventSpace Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave - Montreal, Canada
Duration: 2022 Jul 172022 Jul 22

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSpace Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave


  • Cryogenic infrared space telescope
  • Galaxy formation and evolution
  • High-dispersion spectrometer
  • Planetary system formation
  • Wide-field imaging survey
  • evolution


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