The Fine Guidance Sensor (FGS) is an interferometric instrument on board the Hubble Space Telescope (HST) that provides high-precision pointing information as input to the observatory's attitude control systems.
There will also be a fine guidance sensor system for the James Webb Space Telescope, but it takes a different technical approach.
In some specialized cases, such as astrometry, the FGS's can also be used as scientific instruments.
Read more about Fine Guidance Sensor: The FGS On The Hubble Space Telescope (HST), FGS On The James Webb Space Telescope
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