Hubble Space Telescope Fine Guidance Sensors
E238788
The Hubble Space Telescope Fine Guidance Sensors are high-precision optical instruments that both keep Hubble accurately pointed at astronomical targets and serve as scientific tools for measuring stellar positions and distances.
All labels observed (7)
How this entity was disambiguated
This entity first appeared as the object of triple T2151764 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Hubble Space Telescope Fine Guidance Sensors Context triple: [STS-82, performedMaintenanceOn, Hubble Space Telescope Fine Guidance Sensors]
-
A.
Fine Guidance Sensor
The Fine Guidance Sensor is a high-precision pointing and stabilization instrument on the James Webb Space Telescope that locks onto guide stars to keep the observatory accurately aimed during observations.
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B.
Corrective Optics Space Telescope Axial Replacement (COSTAR)
Corrective Optics Space Telescope Axial Replacement (COSTAR) was a set of corrective mirrors installed on the Hubble Space Telescope to compensate for its flawed primary mirror and restore its intended imaging performance.
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C.
Faint Object Camera
The Faint Object Camera was a high-resolution imaging instrument on the Hubble Space Telescope designed to observe very dim and distant astronomical objects in ultraviolet and visible light.
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D.
Mikulski Archive for Space Telescopes
The Mikulski Archive for Space Telescopes is NASA’s primary online repository for astronomical data from major space-based observatories, including Hubble and other missions.
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E.
Hubble Space Telescope
The Hubble Space Telescope is a large, space-based observatory that has provided some of the most detailed images and data about the universe, revolutionizing modern astronomy and cosmology.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Hubble Space Telescope Fine Guidance Sensors Target entity description: The Hubble Space Telescope Fine Guidance Sensors are high-precision optical instruments that both keep Hubble accurately pointed at astronomical targets and serve as scientific tools for measuring stellar positions and distances.
-
A.
Fine Guidance Sensor
The Fine Guidance Sensor is a high-precision pointing and stabilization instrument on the James Webb Space Telescope that locks onto guide stars to keep the observatory accurately aimed during observations.
-
B.
Corrective Optics Space Telescope Axial Replacement (COSTAR)
Corrective Optics Space Telescope Axial Replacement (COSTAR) was a set of corrective mirrors installed on the Hubble Space Telescope to compensate for its flawed primary mirror and restore its intended imaging performance.
-
C.
Faint Object Camera
The Faint Object Camera was a high-resolution imaging instrument on the Hubble Space Telescope designed to observe very dim and distant astronomical objects in ultraviolet and visible light.
-
D.
Mikulski Archive for Space Telescopes
The Mikulski Archive for Space Telescopes is NASA’s primary online repository for astronomical data from major space-based observatories, including Hubble and other missions.
-
E.
Hubble Space Telescope
The Hubble Space Telescope is a large, space-based observatory that has provided some of the most detailed images and data about the universe, revolutionizing modern astronomy and cosmology.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
astrometric instrument
ⓘ
fine guidance sensor ⓘ space telescope instrument ⓘ |
| commissioned | 1990 ⓘ |
| developedBy |
Goddard Space Flight Center
ⓘ
surface form:
NASA Goddard Space Flight Center
industry contractors ⓘ |
| enables |
long-exposure imaging stability
ⓘ
measurement of Hubble constant via parallaxes ⓘ precise target acquisition ⓘ |
| fieldOfView | narrow field around guide star ⓘ |
| locatedOn | Hubble Space Telescope optical bench ⓘ |
| measurementPrecision | milliarcsecond level ⓘ |
| mountedAt | Hubble Space Telescope focal plane ⓘ |
| numberOfUnits | 3 ⓘ |
| operatedBy |
NASA
ⓘ
Space Telescope Science Institute ⓘ |
| operationalMode |
coarse track
ⓘ
fine lock ⓘ transfer scan for astrometry ⓘ |
| partOf | Hubble Space Telescope ⓘ |
| primaryFunction |
attitude control
ⓘ
fine pointing of Hubble Space Telescope ⓘ |
| requires | bright guide stars ⓘ |
| roleInMission |
backup science instruments
ⓘ
primary pointing reference sensors ⓘ |
| scienceContribution |
calibration of cosmic distance scale
ⓘ
detection of perturbations from unseen companions ⓘ refinement of stellar proper motions ⓘ |
| secondaryFunction |
astrometry
ⓘ
measurement of binary star orbits ⓘ measurement of stellar parallaxes ⓘ measurement of stellar positions ⓘ |
| supportsInstrument |
Advanced Camera for Surveys
ⓘ
Cosmic Origins Spectrograph ⓘ Faint Object Camera ⓘ Faint Object Spectrograph ⓘ Near Infrared Camera and Multi-Object Spectrometer ⓘ Space Telescope Imaging Spectrograph ⓘ Wide Field Camera 3 ⓘ |
| upgradedDuring |
Hubble Servicing Mission 2
ⓘ
Hubble Space Telescope Servicing Mission 3A ⓘ
surface form:
Hubble Servicing Mission 3A
Hubble Space Telescope Servicing Mission 3B ⓘ
surface form:
Hubble Servicing Mission 3B
Hubble Servicing Mission 4 ⓘ |
| usedFor |
fine lock on guide stars
ⓘ
high-precision absolute astrometry ⓘ high-precision relative astrometry ⓘ maintaining stable pointing during observations ⓘ |
| uses |
Koesters prism interferometers
ⓘ
interferometry ⓘ |
| wavelengthRange | visible light ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Hubble Space Telescope Fine Guidance Sensors Description of subject: The Hubble Space Telescope Fine Guidance Sensors are high-precision optical instruments that both keep Hubble accurately pointed at astronomical targets and serve as scientific tools for measuring stellar positions and distances.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Hubble pointing and guidance systems
this entity surface form:
Hubble fine guidance sensors
Hubble Space Telescope Servicing Mission 3A
→
replacedComponent
→
Hubble Space Telescope Fine Guidance Sensors
ⓘ
this entity surface form:
Hubble Space Telescope fine guidance sensor
Hubble Space Telescope science instruments
→
include
→
Hubble Space Telescope Fine Guidance Sensors
ⓘ
this entity surface form:
Fine Guidance Sensors
Hubble Space Telescope science instruments
→
supportInstrument
→
Hubble Space Telescope Fine Guidance Sensors
ⓘ
this entity surface form:
Fine Guidance Sensors
Reaction Wheel Assembly on Hubble Space Telescope
→
interactsWith
→
Hubble Space Telescope Fine Guidance Sensors
ⓘ
this entity surface form:
Hubble star trackers
Reaction Wheel Assembly on Hubble Space Telescope
→
interactsWith
→
Hubble Space Telescope Fine Guidance Sensors
ⓘ
this entity surface form:
Hubble fine guidance sensors
this entity surface form:
fine guidance sensor