The Integrated Science Instrument Module (ISIM) is the part of JWST that contains the science instruments, the Fine Guidance Sensor, and the data-handling computer.
Overview of the Integrated Science Instrument Module (ISIM)
Parent page: JWST Observatory
The Integrated Science Instrument Module (ISIM) is the observatory element that contains the four science instruments as well as the Fine Guidance Sensor (FGS). It also houses electronics that (1) control the instrument detectors and mechanisms, (2) maintain the thermal environment, and (3) provide command and data processing for the science instruments and the FGS. See Figures 1 and 2.
The ISIM Command and Data Handling (ICDH) subsystem provides the commanding, telemetry routing, and processing functions for all of the science instruments, including the Fine Guidance Sensor. The ICDH manages the event-driven science operations of the observatory and coordinates ISIM and spacecraft activities. It performs readout mode processing of the science data, that is, formatting of the science data for each exposure before transfer to the spacecraft's solid state recorder. Software resident on the ICDH analyzes portions of the data for target acquisition purposes.
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Near Infrared Camera, NIRCam
Mid-Infrared Instrument, MIRI
Near Infrared Spectrograph, NIRSpec
Near Infrared Imager and Slitless Spectrograph, NIRISS
Fine Guidance Sensor, FGS
JWST Acronyms and Abbreviations