fine guidance sensor

A fine guidance sensor (FGS) is an instrument on board a space telescope that provides high-precision pointing information as input to the telescope's attitude control systems. Interferometric FGSs have been deployed on the Hubble Space Telescope; a different technical approach is used for the James Webb Space Telescope's FGSs. In some specialized cases, such as astrometry, FGSs can also be used as scientific instruments.

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FGS
space instrument, 
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  Fine Guidance Sensor ⓘ
  one of three identical instruments on the Hubble Space Telescope used for pointing in space

Frameless

Euclid’s Fine Guidance Sensor (FGS) is a completely new development in Europe, and it is responsible for ensuring the mission points with precision, performing all the ‘slews’ (rotations) that a six-year survey mission requires.

Type	Subtype	Date	Description	Notes	Source
class	space instrument		Fine Guidance Sensor	fine guidance sensor	Wikidata
commons	image		Euclid’s Fine Guidance Sensor (FGS) is a completely new development in Europe, and it is responsible for ensuring the mission points with precision, performing all the ‘slews’ (rotations) that a six-year survey mission requires.		Commons