urn:nasa:pds:context:instrument:irtf-maunakea.3m2.mirac2 1.3 1.25.0.0 Product_Context urn:nasa:pds:context:instrument:irtf.3m0.mirac2 MIRAC2 Mid-Infrared Array Camera Mid-Infrared Array Camera 2 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 10.1117/12.317327 Hoffmann, W.F., et al., (1998), MIRAC2: a mid-infrared array camera for astronomy, Proc. SPIE 3354, Infrared Astronomical Instrumentation (21 August 1998). Mid-Infrared Array Camera 2 (MIRAC2) Imager The Mid-Infrared Array Camera (MIRAC2) was an instrument that used a Rockwell HF-16 128 X 128 arsenic-doped silicon blocked-impurity-band (BIB) hybrid array operated at 5 K in a liquid-helium-cooled cryostat. The operating wavelength of MIRAC2 was 2 to 28 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. MIRAC2 operated on United Kingdom Infrared Telescope (UKIRT) 3.8-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. Nominal settings at UKIRT and IRTF give diffraction-limited imaging with 0.34 and 0.27 arcsec/pixel (respectively). The sensitivity on the IRTF at 11.7 micron, 10% bandwidth filter, chop-nod, source in one beam, 1 sigma, one minute total time is 25 mJy/arcsec surface brightness and 43 mJy point source.