urn:nasa:pds:context:instrument:irtf-maunakea.3m2.mirac 1.3 1.25.0.0 Product_Context urn:nasa:pds:context:instrument:irtf.3m0.mirac MIRAC Mid-Infrared Array Camera 2026-07-07 1.3 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.2 Updated schema version. Adding missing "facility" references. Adding missing "telescope" references. 2025-01-02 1.1 Updated schema version. Adding missing "telescope" references. 2021-12-07 1.0 per RMS, deprecated irtf in favor of irtf-maunakea urn:nasa:pds:context:telescope:irtf-maunakea.3m2 instrument_to_telescope urn:nasa:pds:context:facility:observatory.irtf-maunakea instrument_to_facility 10.1117/12.158697 Hoffmann, W.F., et al., (1993), MIRAC: a mid-infrared array camera for astronomy, Proc. SPIE 1946, Infrared Detectors and Instrumentation (20 October 1993). Mid-Infrared Array Camera (MIRAC) Imager The Mid-Infrared Array Camera (MIRAC) was an instrument that a Hughes Aircraft Co. 20 X 64 pixel arsenic-doped silicon impurity band conduction hybrid array with a capacitance transimpedance amplifier readout (CRC 444A) operated at 10 K in a liquid-helium-cooled cryostat. The operating wavelength of MIRAC was 2 to 26 microns. Using 20 parallel readout lines and frame rate of 10 KHz, the array exhibited low noise and good linearity at high background flux, which was essential for 10 and 20 micron ground-based observing conditions. Peak efficiency of 0.42 at 22 micron, and a well size of 120,000 electrons. MIRAC operated on Steward Observatory 2.3-meter and the IRTF 3.0-meter telescopes for observing a variety of objects including infrared-luminous galaxies, planetary nebulae, star forming regions, young stellar objects, and Solar System objects. The NEFD of the MIRAC on the IRTF at 11.7 micron is 0.1 Jy/arcsec^2 in one second of integration on-source, four seconds of total time, including nodding and chopping off-source.