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MIMIZUKU is currently in the evaluation phase. You may propose an observation, but please note that the observation will be conducted as a shared-risk policy.
The Mid-Infrared Multi-field Imager for gaZing at the UnKnown Universe (MIMIZUKU) is the first-generation (mid-)infrared instrument that enables imaging and low-resolution spectroscopic observations in a wavelength range of 1-38 microns. The wide wavelength coverage is achieved by having three optical channels, NIR, MIR-S, and MIR-L, covering 1-5.3, 7-26, and 24-38 microns, respectively. MIMIZUKU has a unique opto-mechanical system called a "field stacker" that enables simultaneous observations of target and reference objects within a distance of less than 25 arcmin. This feature improves the accuracy and reliability of photometric and spectroscopic data.
For the entrance window of the MIMIZUKU optics, KBr window and diamond window are available. This semester, a diamond window is equipped. The diamond window has absorption bands in the L and M bands, and the sensitivity in these bands is not good.
The NIR channel has a HAWAII-1RG (HgCdTe 1k-format) array with a cut-off wavelength of 5.3 microns and covers 1-5.3 microns. The atmospheric transmittance and the wavelength coverage of each observing mode are shown below.
 |  |
| Available modes and atmospheric transmittance smoothed with a Gaussian profile with an FWHM of 0.002 um-1. | Atmospheric transmittance covered by the 2.7-um spectroscopy mode smoothed with a Gaussian profile with an FWHM of 0.00056 um-1. |
| Wavelength Coverage | 1-5.3 microns | |
|---|---|---|
| Detector | 1k-format HgCdTe array (Teledyne HAWAII-1RG 5.3um-cutoff) | |
| Pixel Scale | 0.069"/pix | 18 um/pix |
| Field of View | 1.2' x 1.2' | w/o Field Stacker |
| 36" x 1.2' x 2 fields | w/ Field Stacker | |
| Final F number | 8.76 | |
| Spatial Resolution | Seeing limit | |
| Imaging Filters | J, H, Ks, L', and M' | |
| Spectroscopy | KL and LM bands with R~200 | |
| 2.7-um band with R~660 | ||
| Slit | 0.96" x 36" | wider region (2.7" width) also available. |
The MIR-S channel has an Aquarius array (Si:As 1k-format) array and covers 7-26 microns. The atmospheric transmittance and the wavelength coverage of each observing mode are shown below.
 |  |
| N-band modes and atmospheric transmittance smoothed with a Gaussian profile with an FWHM of 0.0005 um-1. | Same as the left figure but for the Q band. |
| Wavelength Coverage | 7-26 microns | |
|---|---|---|
| Detector | 1k-format Si:As IBC array (Raytheon Aquarius) | |
| Pixel Scale | 0.11"/pix | 30 um/pix |
| Field of View | 2.0' x 2.0' | w/o Field Stacker |
| 59" x 2.0' x 2 fields | w/ Field Stacker | |
| Final F number | 8.76 | |
| Spatial Resolution | Diffraction limit | Effective telescope diameter: 6.15 m |
| Imaging Filters | 7.7, 9.8, 11.5, 13.1, 16.7, 17.9, 20.9, and 24.5 um | |
| Spectroscopy | N band with R~170 | |
| Q band with R~110 | ||
| Slit | 0.58" x 57" x 2 slits | |
| 1.1" x 57" x 2 slits |
The MIR-L channel has a 128px-format Si:Sb array and covers 24-38 microns.
 |
| Modes in 30-um band and the atmospheric transmittance. |
| Wavelength Coverage | 24-38 microns | |
|---|---|---|
| Detector | 128-format Si:Sb BIB array (DRS MF-128) | |
| Pixel Scale | 0.24"/pix | 75 um/pix |
| Field of View | 31" x 31" | w/o Field Stacker |
| 15" x 31' x 2 fields | w/ Field Stacker | |
| Final F number | 10.5 | |
| Spatial Resolution | Diffraction limit | Effective telescope diameter: 6.15 m |
| Imaging Filters | 32 and 37 um | |
| Spectroscopy | N/A | |
| Slit | N/A |
Currently, not available.
