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The Return of IRIM: New and Improved (1Sep92)
(from KPNO, NOAO Newsletter No. 31, 1 September 1992)

A glance at the instrumentation listing elsewhere in this Newsletter
shows the infrared camera IRIM once more available at the 4-m, 2.1-m,
and 1.3-m telescopes in spring 1993. It will return to the mountain
equipped with a 256 x 256 HgCdTe array. In addition, new optics will
provide a scale of 0.55 arcsec per pixel at the 4-m and 1.7 arcsec per
pixel at the 1.3-m. The revised filter complement is as follows:
broadband J, H, and "short" K (2.0-2.3 um), narrowband 2.12 H2, 2.16 Br g,
2.22 continuum, and 2.36 CO filters.

Capabilities for polarimetry and focal plane occulting of bright
sources, which were ad hoc additions to the original instrument, will
no longer be available.  These are being incorporated in improved form
in our second generation cameras.

We do not yet have hard performance data for the array or the camera
system.  We expect performance similar to that reported by Hodapp et
al. (1992, PASP, 104, 441).

Ron Probst

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