What kind of instruments will Webb have?
The James Webb Space Telescope includes four scientific instruments: the Near Infrared Camera (NIRCam), the Near-Infrared Spectrograph (NIRSpec), the Mid-Infrared Instrument (MIRI), and the Fine Guidance Sensor and Tunable Filter Instrument (FGS-TFI). • What kind of detectors will Webb have? Webb will have two types of detector arrays (SCA): visible to near-infrared arrays with 2,048 x 2,048 pixels, and mid-infrared arrays with about 1,024 x 1,024 pixels. Several detectors will be built into mosaics to give a larger field of view. NIRCam, NIRSpec and FGS-TFI will use Mercury Cadmium Telluride (HgCdTe) detectors made by Teledyne Scientific & Imaging. MIRI will employ arsenic doped silicon (Si:As) detectors produced by Raytheon. • What is the operating temperature of the telescope and the instruments? The large sunshade will protect the telescope from heating by direct sunlight, allowing it to cool down to a temperature below 50 Kelvin (equal to -370 degree F, or -223 degree C) by passiv
