Overview of Design and Validation of the Fine Guidance Sensor Mechanisms for JWST
Abstract
Three mechanisms have been developed for cryogenic operation within the Fine Guidance Sensor, to fly on the James Webb Space Telescope (JWST):• Two linear translation mechanisms (Fig.1) facilitate on-orbit focusing of each of the Guider and Near Infrared Imager and Slitless Spectrograph (NIRISS) instrument imaging systems (either side of bench)• A dual wheel mechanism (Fig.2) provides a selection of infra-red filters, masks and grisms to enable imaging and slitless spectroscopy functionsThe Fine Guidance Sensor (FGS) is one of four JWST instruments, having the primary function to provide a redundant guiding capability (95% probability each of finding a guide star anywhere in the sky). The FGS instrument features a science module referred to as the Near Infrared Imager and Slitless Spectrograph (NIRISS), which enables imaging and grism spectroscopy, with a particular capability for exoplanet detection and atmospheric characterisation [1].
- Publication:
-
15th European Space Mechanisms and Tribology Symposium
- Pub Date:
- September 2013
- Bibcode:
- 2013ESASP.718E..37G