100-inch Hooker telescope

E553793

astronomical observatory instrument historical scientific instrument reflecting telescope

The 100-inch Hooker telescope is a historic reflecting telescope at Mount Wilson Observatory, famous for Edwin Hubble’s observations that revealed the expanding universe and established galaxies beyond the Milky Way.

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All labels observed (2)

Label	Occurrences
Hooker Telescope	2
100-inch Hooker telescope canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T5851146 — 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
Context triple: [Mount Wilson Observatory, hasTelescope, 100-inch Hooker telescope]

A. Hale Telescope
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.
B. Palomar 18-inch Schmidt Telescope
The Palomar 18-inch Schmidt Telescope is a small wide-field survey instrument at Palomar Observatory historically used for photographic sky surveys and the discovery of comets and asteroids.
C. 20 Meter Telescope
The 20 Meter Telescope is a mid-sized radio telescope at the Green Bank Observatory used for astronomical research and education in radio astronomy.
D. Palomar 48-inch Schmidt Telescope
The Palomar 48-inch Schmidt Telescope is a wide-field survey telescope at Palomar Observatory renowned for its major contributions to sky surveys and the discovery of numerous astronomical objects.
E. Palomar 60-inch Telescope
The Palomar 60-inch Telescope is a 1.5-meter-class reflecting telescope at Palomar Observatory used primarily for optical imaging and time-domain astronomy.
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
Target entity description: The 100-inch Hooker telescope is a historic reflecting telescope at Mount Wilson Observatory, famous for Edwin Hubble’s observations that revealed the expanding universe and established galaxies beyond the Milky Way.

A. Hale Telescope
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.
B. Palomar 18-inch Schmidt Telescope
The Palomar 18-inch Schmidt Telescope is a small wide-field survey instrument at Palomar Observatory historically used for photographic sky surveys and the discovery of comets and asteroids.
C. 20 Meter Telescope
The 20 Meter Telescope is a mid-sized radio telescope at the Green Bank Observatory used for astronomical research and education in radio astronomy.
D. Palomar 48-inch Schmidt Telescope
The Palomar 48-inch Schmidt Telescope is a wide-field survey telescope at Palomar Observatory renowned for its major contributions to sky surveys and the discovery of numerous astronomical objects.
E. Palomar 60-inch Telescope
The Palomar 60-inch Telescope is a 1.5-meter-class reflecting telescope at Palomar Observatory used primarily for optical imaging and time-domain astronomy.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	astronomical observatory instrument ⓘ historical scientific instrument ⓘ reflecting telescope ⓘ
associatedWithDiscovery	cosmological expansion (Hubble–Lemaître law) ⓘ galaxies beyond the Milky Way ⓘ
completedIn	1917 ⓘ
constructionStarted	1908 ⓘ
eraOfMajorUse	early 20th century ⓘ
firstLight	1917 ⓘ
fundedBy	Carnegie Institution of Washington NERFINISHED ⓘ John Daggett Hooker NERFINISHED ⓘ
hasAperture	100 inches ⓘ 2.5 meters ⓘ
hasCoordinateSystem	equatorial coordinate system ⓘ
hasDome	Mount Wilson 100-inch dome NERFINISHED ⓘ
hasFocalLength	approximately 15 meters ⓘ
heritageDesignation	National Historic Landmark (as part of Mount Wilson Observatory site) NERFINISHED ⓘ
locatedIn	Los Angeles County ⓘ surface form: Los Angeles County, California Mount Wilson Observatory NERFINISHED ⓘ Mount Wilson, California NERFINISHED ⓘ San Gabriel Mountains NERFINISHED ⓘ United States of America ⓘ surface form: United States
mountType	equatorial mount ⓘ
namedAfter	John Daggett Hooker NERFINISHED ⓘ
notableFor	evidence that spiral nebulae are external galaxies ⓘ measurements of Cepheid variable stars in spiral nebulae ⓘ observations leading to discovery of the expanding universe ⓘ observations of galaxies beyond the Milky Way ⓘ
operatedBy	Carnegie Institution for Science NERFINISHED ⓘ Mount Wilson Observatory NERFINISHED ⓘ
opticalDesign	classical Cassegrain ⓘ
primaryMirrorDiameter	100 inches ⓘ
primaryMirrorMaterial	glass ⓘ
replacedAsLargestBy	200-inch Hale telescope NERFINISHED ⓘ
status	historical research telescope ⓘ partially retired from frontline research ⓘ
telescopeType	Cassegrain reflector ⓘ
usedBy	Edwin Hubble NERFINISHED ⓘ George Ellery Hale NERFINISHED ⓘ Milton Humason NERFINISHED ⓘ Walter Baade NERFINISHED ⓘ
usedFor	cosmology ⓘ extragalactic astronomy ⓘ photography ⓘ spectroscopy ⓘ stellar astronomy ⓘ
usedInPublication	Edwin Hubble’s 1923–1924 papers on Cepheids in Andromeda NERFINISHED ⓘ Edwin Hubble’s 1929 paper on the relation between distance and radial velocity among extra-galactic nebulae ⓘ
wasLargestTelescopeInWorld	1917–1949 ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Mount Wilson Observatory → hasTelescope → 100-inch Hooker telescope ⓘ

John D. Hooker → supportedProject → 100-inch Hooker telescope ⓘ

this entity surface form: Hooker Telescope

John D. Hooker → associatedWith → 100-inch Hooker telescope ⓘ