Fine Guidance Sensor
E59347
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Fine Guidance Sensor canonical | 8 |
How this entity was disambiguated
This entity first appeared as the object of triple T476195 — 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: Fine Guidance Sensor Context triple: [James Webb Space Telescope, instrumentType, Fine Guidance Sensor]
-
A.
Goddard High Resolution Spectrograph
The Goddard High Resolution Spectrograph was a highly sensitive ultraviolet spectrograph aboard the Hubble Space Telescope used to study the composition, temperature, and motion of astronomical objects.
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B.
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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C.
MICROSCOPE satellite mission
The MICROSCOPE satellite mission was a French-led space experiment designed to test the validity of Einstein’s equivalence principle with unprecedented precision by comparing the free fall of different materials in orbit.
-
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
- 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: Fine Guidance Sensor Target entity description: 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.
-
A.
Goddard High Resolution Spectrograph
The Goddard High Resolution Spectrograph was a highly sensitive ultraviolet spectrograph aboard the Hubble Space Telescope used to study the composition, temperature, and motion of astronomical objects.
-
B.
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.
-
C.
MICROSCOPE satellite mission
The MICROSCOPE satellite mission was a French-led space experiment designed to test the validity of Einstein’s equivalence principle with unprecedented precision by comparing the free fall of different materials in orbit.
-
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 (48)
| Predicate | Object |
|---|---|
| instanceOf |
James Webb Space Telescope instrument
ⓘ
astronomical instrument ⓘ guidance sensor ⓘ |
| acronymExpansion | Fine Guidance Sensor ⓘ |
| alsoKnownAs | FGS ⓘ |
| contributesTo | pointing stability of James Webb Space Telescope ⓘ |
| countryOfOrigin | Canada ⓘ |
| dataUsedBy | attitude control system ⓘ |
| detectorArraySize | 2048 x 2048 pixels ⓘ |
| detectorType | HgCdTe infrared detector ⓘ |
| developedBy |
COM DEV International
ⓘ
Canadian Space Agency ⓘ Honeywell Aerospace ⓘ
linked to:
Honeywell
|
| developedFor | NASA ⓘ |
| enables |
high-precision imaging
ⓘ
long-exposure observations ⓘ stable spectroscopy ⓘ |
| fieldOfView | approximately 2.4 arcminutes by 2.4 arcminutes ⓘ |
| firstLightDate | 2022-02 ⓘ |
| guidingMode |
can track guide stars during telescope slews
ⓘ
locks onto single guide star ⓘ |
| launchDate | 2021-12-25 ⓘ |
| launchSite | Guiana Space Centre ⓘ |
| launchVehicle | Ariane 5 ECA ⓘ |
| locatedOn | integrated science instrument module ⓘ |
| manufacturer |
Honeywell Aerospace
ⓘ
linked to:
Honeywell
|
| mission |
James Webb Space Telescope mission
ⓘ
linked to:
James Webb Space Telescope
|
| operatedBy | Space Telescope Science Institute ⓘ |
| operationalTemperature | approximately 40 kelvin ⓘ |
| orbit | Sun–Earth L2 halo orbit ⓘ |
| partOf | James Webb Space Telescope ⓘ |
| pointingAccuracy | better than 5 milliarcseconds ⓘ |
| primaryFunction |
attitude control support
ⓘ
fine guidance ⓘ high-precision pointing ⓘ stabilization ⓘ |
| provides |
attitude measurements
ⓘ
fine pointing information ⓘ |
| roleInAttitudeControl | provides fine pointing error signals to attitude control system ⓘ |
| sharesModuleWith | Near-Infrared Imager and Slitless Spectrograph ⓘ |
| spacecraft | James Webb Space Telescope ⓘ |
| status | operational ⓘ |
| supports | all JWST science instruments ⓘ |
| supportsObservationModes |
imaging
ⓘ
spectroscopy ⓘ time-series observations ⓘ |
| uses | guide stars ⓘ |
| wavelengthRange | 0.8 to 5.0 micrometres ⓘ |
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: Fine Guidance Sensor Description of subject: 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.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.