The Update for S14B Applicants


MOIRCS will be unavailable for a few months due to the MOIRCS Upgrade Project (detector replacement). Though the closure is likely to occur near the end of the semester, we are still seeking the best scheduling option. Therefore, we still accept proposals for the relevant periods. However, please be aware that any observations could be cancelled by the actual engineering schedule. All observations after the upgrade will be executed under the shared-risk policy. We are sorry for the inconvenience.

If you have any specific questions, please email to the SA.

When you apply to the MOS observation, you must explicitly state the required number of MOS masks (both for the Full and the Minimum Number of Nights) in the Sect 11 of the application form. And also, justify why you need the requested number on the technical detail part in Sect 14. Please note that the maximum number of MOS mask available for one contiguous observing period is 15.

Please note that the number of MOS mask will be fixed once it is assigned by TAC's critical reviewing. The request for any backup mask is basically not permitted, unless there are any special reasons.


We will have significant periods of instrument closure during late 2014 to 2015 for "nuMOIRCS" Project.

Please be aware that the detectors are to be changed to Hawaii2-RG. All electronics related to the detector readout will also be replaced (to ASIC+SAM). The benefit of this is the significant reduction of the overhead for detector readout.

We are also planning to introduce the IFU spectroscopy function to MOIRCS. The date of the downtime is still TBD, though it should happen somewhere in 2015. We will update the schedule soon via this website.


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 Hawaii-2 2048×2048 arrays with the spatial resolution of 0.117 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 aluminium slit masks, MOIRCS can acquire about 40 object spectra simultaneously across 0.9~2.5 micron wavelength range. Currently low-resolution (R~500), medium-resolution (R~1300), and high-resolution (R~3000) modes 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 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

Note that any data on the pages are subject to change.

Dr. Ichi Tanaka (MOIRCS Support Astronomer: email )

Updated 2014-02-07

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