Hale Telescope
E134885
The Hale Telescope is a historic 200-inch reflecting telescope at Palomar Observatory in California that was once the world’s largest and remains a landmark instrument in observational astronomy.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Hale Telescope canonical | 2 |
| 200-inch Hale Telescope | 1 |
| 200-inch Hale Telescope at Palomar Observatory | 1 |
| Hale telescope | 1 |
| Palomar 200-inch Telescope | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1091073 — 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: Hale Telescope Context triple: [George Ellery Hale, honorificEponym, Hale Telescope]
-
A.
100-inch Hooker Telescope at Mount Wilson Observatory
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.
-
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.
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.
-
D.
Baade Telescope
The Baade Telescope is one of the twin 6.5-meter Magellan optical telescopes used for cutting-edge astronomical research in Chile.
-
E.
Magellan Clay Telescope
The Magellan Clay Telescope is one of the twin 6.5-meter Magellan telescopes at Las Campanas Observatory in Chile, used for cutting-edge optical and infrared astronomical 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: Hale Telescope Target entity description: The Hale Telescope is a historic 200-inch reflecting telescope at Palomar Observatory in California that was once the world’s largest and remains a landmark instrument in observational astronomy.
-
A.
100-inch Hooker Telescope at Mount Wilson Observatory
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.
-
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.
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.
-
D.
Baade Telescope
The Baade Telescope is one of the twin 6.5-meter Magellan optical telescopes used for cutting-edge astronomical research in Chile.
-
E.
Magellan Clay Telescope
The Magellan Clay Telescope is one of the twin 6.5-meter Magellan telescopes at Las Campanas Observatory in Chile, used for cutting-edge optical and infrared astronomical research.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical observatory instrument
ⓘ
optical telescope ⓘ reflecting telescope ⓘ |
| altitude | approximately 1700 meters ⓘ |
| commissioned | 1949 ⓘ |
| constructionStarted | 1936 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designedBy |
George Ellery Hale
ⓘ
George Willis Ritchey ⓘ John A. Anderson ⓘ Optical designers at Caltech ⓘ |
| firstLightDate | 1949-01-26 ⓘ |
| fundedBy |
California Institute of Technology
ⓘ
Rockefeller Foundation ⓘ |
| hasAperture |
200 inches
ⓘ
5.08 meters ⓘ |
| hasDomeDiameter | approximately 42 meters ⓘ |
| hasDomeType | steel dome ⓘ |
| hasPrimaryMirrorMaterial | Pyrex glass ⓘ |
| heritageStatus |
National Historic Landmark
ⓘ
surface form:
National Historic Landmark (as part of Palomar Observatory)
|
| isHistoric | true ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Palomar Observatory ⓘ San Diego County ⓘ
surface form:
San Diego County, California
United States of America ⓘ
surface form:
United States
|
| locatedOn | Palomar Mountain ⓘ |
| mountType | equatorial mount ⓘ |
| namedAfter | George Ellery Hale ⓘ |
| notableDiscovery |
contributions to understanding galaxy morphology
ⓘ
detailed observations of quasars ⓘ measurements supporting cosmological distance scale ⓘ |
| operatedBy |
California Institute of Technology
ⓘ
Palomar Observatory ⓘ |
| opticalDesign | Ritchey–Chrétien reflector ⓘ |
| primaryMirrorCastBy |
Corning Incorporated
ⓘ
surface form:
Corning Glass Works
|
| primaryMirrorDiameter |
200 inches
ⓘ
5.08 meters ⓘ |
| replacedAsLargestBy | BTA-6 telescope ⓘ |
| stillOperational | true ⓘ |
| usedFor |
cosmology observations
ⓘ
imaging of galaxies ⓘ optical astronomy ⓘ photometry ⓘ spectroscopy ⓘ stellar astronomy ⓘ |
| wasWorldsLargestOpticalTelescopeUntil | 1976 ⓘ |
| wavelengthRange |
near-infrared
ⓘ
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: Hale Telescope Description of subject: The Hale Telescope is a historic 200-inch reflecting telescope at Palomar Observatory in California that was once the world’s largest and remains a landmark instrument in observational astronomy.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
100-inch Hooker Telescope
this entity surface form:
200-inch Hale Telescope at Palomar Observatory
this entity surface form:
Palomar 200-inch Telescope
this entity surface form:
200-inch Hale Telescope