The Update for S24A Applicants


A new K-band medium-resolution grism will be available.

    A new medium-resolution grism for K-band window (VB-K grism: Ebizuka et al. 2023) will be available to users from S24A. Its spectral resolution is similar to the existing VPH_K grism. But the wavelength coverage covered by >80 % grating efficiency is ~7 times wider than the existing VPH_K. Thus we can observe across all the K-band window with high efficiency. Some shortcomings of the VPH_K are also covercome. Characterization of the VB-K grism with MOIRCS will start from fall 2023. The applicants can submit the proposal based on the VPH_K performance. If our characterization is satisfactory for the open-use, we will offer the use of new grating to the awarded PIs.

MOS Mode will be available for Service Mode

    A conditional access to the Multi-Object Spectroscopy (MOS) Mode for Service Program will start from S24A. The applicants of the MOS mode have to have the MOS masks that were previously-cut already (namely, this program is the promotion for the publication of old data by offering the supplement). Maximum number of the masks for service mode are 2. The use of the common-use longslit masks are not allowed.

General Notes


MOIRCS (Multi-Object InfraRed Camera and Spectrograph) provides wide-field imaging and long-slit/multi-object (MOS) spectroscopic capabilities in the 0.9 ~ 2.5 µm spectral range under the natural seeing condition. The 4'×7' field of view is covered by two 2048×2048 Hawaii-2RG infrared detector arrays with a spatial resolution of 0.116 arcsec/pixel.

For the imaging mode, the standard MKO YJHKs filters as well as some narrow-band filters are available. See the Imaging Mode Page for more details.

The MOS performance of MOIRCS spectroscopy mode is the most notable feature of the instrument. Using the cooled aluminum slit masks, MOIRCS can acquire 40 ~ 60 object spectra simultaneously across a 0.9~2.5 µm wavelength range. The low-resolution (R~500) and medium-resolution (R~2000-3000) grisms are available. See the Spectroscopy Page for more details. All MOS observers/applicants should carefully read the MOS observation pages.

Instrument and Detector

Imaging mode

Spectroscopy mode

Instrument Citation

Please cite the following papers when you refer to MOIRCS in your publication.

"Multi-Object Infrared Camera and Spectrograph (MOIRCS) for the Subaru Telescope I. Imaging"
Suzuki, R. et al. Publications of the Astronomical Society of Japan, 2008, Vol.60, No.6, pp.1347--1362.
"MOIRCS: Multi-Object Infrared Camera and Spectrograph for SUBARU"
Ichikawa, T. et al. 2006, in Proc. of SPIE, Vol. 6269, 38

For the MOIRCS Upgrade 2015 works, you may refer to these papers below.

"The NuMOIRCS Project: Detector Upgrade Overview and Early Commissioning Results"
Walawender, J. et al. 2016, Proc. of SPIE, Vol. 9908, doi: 10.1117/12.2231812
"Detector Upgrade of Subaru's Multi-Object Infrared Camera and Spectrograph (MOIRCS)"
Fabricius, M. et al. 2016, Proc. of SPIE, Vol. 9908, doi: 10.1117/12.2231417

MOIRCS Management Structure

  • Observation Support Astronomers
    • Primary: Dr. Ichi Tanaka (email: )
    • Secondary: Dr. Kentaro Aoki (email: )
  • Primary Instrument Operator / Documentation Responsible
    • TBD
  • Data Distribution Responsible
    • Tom Winegar and Computer Division (email:
  • Instrument Hardware and Software Responsible
    • Instrument Division (email:
    * Please change _AT_ to @ for the email address.

    The Support Schedule can be found here.

Any questions regarding MOIRCS should be directed to Dr. Ichi Tanaka (primary SA: e-mail ).

Updated 2023-02-05

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