FGS On The James Webb Space Telescope
A guiding system, also called FGS, but using different technology, is also planned for the James Webb Space Telescope (JWST). It provides input for the planned observatory's attitude control system (ACS). During on-orbit commissioning of the JWST, the FGS will also provide pointing error signals during activities to achieve alignment and phasing of the segments of the deployable primary mirror.
The JWST FGS will be supplied by the Canadian Space Agency. To save on mass and volume it will be assembled in a single unit also containing the Tunable Filter Imager, but they are separate optical instruments.
Read more about this topic: Fine Guidance Sensor
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