KASINICS: Near Infrared Camera System for the BOAO 1.8 m Telescope

We developed Korea Astronomy and Space science Institute (KASI) Near Infrared Camera System (KASINICS) to be installed on the 1.8 m telescope of Bohyunsan Optical Astronomy Observatory (BOAO) in Korea. We use a 512×512 InSb array (Aladdin III Quadrant, Raytheon Co.) to enable L band observations as well as $J, H$, and Kₛ bands. The field-of-view of the array is 3.75pt^.75pt.1pt3×3.75pt^.75pt.1pt3 with a resolution of 0.75pt^.75pt.1.75pt39$/$pixel. We adopt an Offner relay optical system, which provides a cold stop to eliminate thermal background emission from the telescope structures. Most parts of the camera, including the mirrors, were manufactured from the same ingot of aluminum alloy to ensure a homologous contraction from room temperature to 80 K. We also developed a readout electronics system for the array detector. Based on preliminary results from test observations, the limiting magnitudes are $J=$ 17.6, $H=$ 17.5, Kₛ = 16.1, and L(narrow) $=$ 10.0 mag at a signal-to-noise ratio of 10 for an integration time of 100 s.