100-inch Hooker Telescope at Mount Wilson Observatory
E93421
The 100-inch Hooker Telescope at Mount Wilson Observatory is a historic reflecting telescope that played a pivotal role in early 20th-century astronomy, including landmark discoveries about galaxies and the expanding universe.
All labels observed (5)
How this entity was disambiguated
This entity first appeared as the object of triple T781621 — 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: 100-inch Hooker Telescope at Mount Wilson Observatory Context triple: [Walter Baade, notableObservationSite, 100-inch Hooker Telescope at Mount Wilson Observatory]
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A.
Swope Telescope
The Swope Telescope is a 1-meter-class optical telescope at Chile’s Las Campanas Observatory, known for its role in supernova and transient object discoveries.
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B.
du Pont Telescope
The du Pont Telescope is a 2.5-meter optical telescope at Chile’s Las Campanas Observatory used for a wide range of astronomical imaging and spectroscopic research.
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C.
Baade Telescope
The Baade Telescope is one of the twin 6.5-meter Magellan optical telescopes used for cutting-edge astronomical research in Chile.
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D.
Víctor M. Blanco 4-meter Telescope
The Víctor M. Blanco 4-meter Telescope is a prominent optical telescope in Chile widely used for deep-sky surveys and cosmological research.
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E.
Owens Valley Radio Observatory
Owens Valley Radio Observatory is a major radio astronomy facility in California used for observing celestial radio sources and conducting astrophysical research.
- 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: 100-inch Hooker Telescope at Mount Wilson Observatory Target entity description: The 100-inch Hooker Telescope at Mount Wilson Observatory is a historic reflecting telescope that played a pivotal role in early 20th-century astronomy, including landmark discoveries about galaxies and the expanding universe.
-
A.
Swope Telescope
The Swope Telescope is a 1-meter-class optical telescope at Chile’s Las Campanas Observatory, known for its role in supernova and transient object discoveries.
-
B.
du Pont Telescope
The du Pont Telescope is a 2.5-meter optical telescope at Chile’s Las Campanas Observatory used for a wide range of astronomical imaging and spectroscopic research.
-
C.
Baade Telescope
The Baade Telescope is one of the twin 6.5-meter Magellan optical telescopes used for cutting-edge astronomical research in Chile.
-
D.
Víctor M. Blanco 4-meter Telescope
The Víctor M. Blanco 4-meter Telescope is a prominent optical telescope in Chile widely used for deep-sky surveys and cosmological research.
-
E.
Owens Valley Radio Observatory
Owens Valley Radio Observatory is a major radio astronomy facility in California used for observing celestial radio sources and conducting astrophysical research.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical observatory instrument
ⓘ
historical scientific instrument ⓘ reflecting telescope ⓘ |
| associatedWithDiscovery |
Hubble–Humason velocity–distance relation
ⓘ
evidence for Hubble–Lemaître law ⓘ extragalactic nature of Andromeda Galaxy ⓘ |
| builder |
Mount Wilson Observatory workshop
ⓘ
linked to:
Mount Wilson Observatory
|
| completedIn | 1917 ⓘ |
| constructionStartDate | 1908 ⓘ |
| country | United States of America ⓘ |
| diameter |
100 inches
ⓘ
2.5 meters ⓘ |
| eraOfProminence | early 20th century ⓘ |
| firstLightDate | 1917 ⓘ |
| fundedBy | John D. Hooker ⓘ |
| hasDome | rotating steel dome ⓘ |
| heldWorldsLargestTitleFrom | 1917 ⓘ |
| heldWorldsLargestTitleUntil | 1948 ⓘ |
| heritageDesignation |
National Historic Landmark (as part of Mount Wilson Observatory)
ⓘ
linked to:
National Historic Landmark
|
| locatedIn |
Mount Wilson Observatory
ⓘ
San Gabriel Mountains ⓘ near Pasadena, California ⓘ |
| mountType | equatorial mount ⓘ |
| namedAfter | John D. Hooker ⓘ |
| notableFor |
establishing that spiral nebulae are external galaxies
ⓘ
measurement of Cepheid variable stars in Andromeda ⓘ observations leading to discovery of the expansion of the universe ⓘ |
| observatoryAltitude |
approximately 1740 meters
ⓘ
approximately 5700 feet ⓘ |
| operatedBy |
Carnegie Institution of Washington
ⓘ
Carnegie Observatories ⓘ |
| opticalDesign | Cassegrain reflector ⓘ |
| partOf |
Mount Wilson Observatory telescope collection
ⓘ
linked to:
Mount Wilson Observatory
|
| primaryMirrorType | glass mirror ⓘ |
| significance |
key instrument in establishing the scale of the universe
ⓘ
pivotal role in development of modern observational cosmology ⓘ |
| status |
historical telescope
ⓘ
still operational for limited use ⓘ |
| surpassedBy |
200-inch Hale Telescope at Palomar Observatory
ⓘ
linked to:
Hale Telescope
|
| usedBy |
Edwin Hubble
ⓘ
George Ellery Hale ⓘ Milton Humason ⓘ Walter Baade ⓘ |
| usedFor |
cosmology
ⓘ
extragalactic astronomy ⓘ observational astronomy ⓘ photography of deep-sky objects ⓘ spectroscopy ⓘ stellar astronomy ⓘ |
| wasWorldsLargestTelescope | true ⓘ |
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: 100-inch Hooker Telescope at Mount Wilson Observatory Description of subject: The 100-inch Hooker Telescope at Mount Wilson Observatory is a historic reflecting telescope that played a pivotal role in early 20th-century astronomy, including landmark discoveries about galaxies and the expanding universe.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: 100-inch Hooker Telescope at Mount Wilson Observatory
linked to: 100-inch Hooker Telescope at Mount Wilson Observatory
linked to: 100-inch Hooker Telescope at Mount Wilson Observatory
linked to: 100-inch Hooker Telescope at Mount Wilson Observatory