Fine Guidance Sensor

Fine Guidance Sensor (FGS) for the Hubble Space Telescope is a system of three instruments used for pointing the telescope in space, and also for astrometry and its related sciences. To enable aiming the telescope at a specific spot in the sky, each FGS combines optics and electronics. There are three Hubble FGS, and they have been upgraded over the lifetime of the telescope by crewed Space Shuttle missions. The instruments can support pointing of 2 milli-arc seconds. The three FGS are part of the Hubble Space Telescope's Pointing Control System, aka PCS. The FGS function in combination with the Hubble main computer and gyroscopes, with the FGS providing data to the computer as sensors which enables the HST to track astronomical targets.

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FGS
height 1.6 metre, mass 220 kilogram, length 0.5 metre, 
fine guidance sensor, PerkinElmer, United States, 
Persia, Fine guidance sensor, fine guidance sensor, Republic of Haiti, Ekran, Dong Fang Hong 2, Tarshish, Sikh Confederacy, Reman, United States, Kingdom of Wolaita, Kingdom of Martabam-hongsawatoi, Havilah, Democratic Republic of the Congo, Chinland, Calvinist Republic of Ghent, Ashkenaz, 

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Frameless

238888main FGS

238888main FGS

Fgs sm

Fgs sm

Astronaut Joseph Tanner handles a Fine Guidance Sensor during Servicing Mission 2 (S82-E-54041) (cropped)

Astronaut Joseph Tanner handles a Fine Guidance Sensor during Servicing Mission 2 (S82-E-54041)

Astronaut Joseph Tanner handles a Fine Guidance Sensor during Servicing Mission 2 (S82-E-54041) (cropped)

Astronaut Joseph Tanner handles a Fine Guidance Sensor during Servicing Mission 2 (S82-E-54041)

Gregory J. Harbaugh (left) and Joseph R.Tanner on arm during accessing Fine Guidance Sensor (FGS) in the F site.

Astronauts Joseph Tanner – on the robotic arm – and Gregory Harbaugh replace the Hubble Space Telescope's Fine Guidance Sensors (FGS) in 1997. The FGS are used to locate and lock onto a target star while science instruments make observations.

Type	Subtype	Date	Description	Notes	Source
commons	image		238888main FGS		Commons
commons	image		238888main FGS		Commons
commons	image		Fgs sm		Commons
commons	image		Fgs sm		Commons
commons	image		Astronaut Joseph Tanner handles a Fine Guidance Sensor during Servicing Mission 2 (S82-E-54041) (cropped)		Commons
commons	image		Astronaut Joseph Tanner handles a Fine Guidance Sensor during Servicing Mission 2 (S82-E-54041)		Commons
commons	image		Astronaut Joseph Tanner handles a Fine Guidance Sensor during Servicing Mission 2 (S82-E-54041) (cropped)		Commons
commons	image		Astronaut Joseph Tanner handles a Fine Guidance Sensor during Servicing Mission 2 (S82-E-54041)		Commons
commons	image		Gregory J. Harbaugh (left) and Joseph R.Tanner on arm during accessing Fine Guidance Sensor (FGS) in the F site.		Commons
commons	image		Astronauts Joseph Tanner – on the robotic arm – and Gregory Harbaugh replace the Hubble Space Telescope's Fine Guidance Sensors (FGS) in 1997. The FGS are used to locate and lock onto a target star while science instruments make observations.		Commons