Harvard Classification Scheme
E567162
The Harvard Classification Scheme is an early 20th-century stellar classification system that organizes stars primarily by their spectral characteristics and temperatures into types such as O, B, A, F, G, K, and M.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Harvard Classification Scheme canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6063571 — 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: Harvard Classification Scheme Context triple: [Annie Jump Cannon, notableWork, Harvard Classification Scheme]
-
A.
Dewey Decimal Classification
Dewey Decimal Classification is a widely used library classification system that organizes knowledge into ten main subject classes, each subdivided into more specific numeric categories.
-
B.
Lugano classification
The Lugano classification is a standardized system used to stage and assess the extent of non-Hodgkin lymphoma and other lymphomas in clinical practice and research.
-
C.
APG III classification
APG III classification is a widely used modern system for classifying flowering plants based on molecular phylogenetic evidence, developed by the Angiosperm Phylogeny Group.
-
D.
Library of Congress Classification
Library of Congress Classification is a comprehensive alphanumeric library classification system used primarily by academic and research libraries to organize and arrange their collections by subject.
-
E.
Universal Decimal Classification
Universal Decimal Classification is an international library classification system that organizes knowledge into a detailed, hierarchical numeric scheme used widely in libraries and information centers around the world.
- 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: Harvard Classification Scheme Target entity description: The Harvard Classification Scheme is an early 20th-century stellar classification system that organizes stars primarily by their spectral characteristics and temperatures into types such as O, B, A, F, G, K, and M.
-
A.
Dewey Decimal Classification
Dewey Decimal Classification is a widely used library classification system that organizes knowledge into ten main subject classes, each subdivided into more specific numeric categories.
-
B.
Lugano classification
The Lugano classification is a standardized system used to stage and assess the extent of non-Hodgkin lymphoma and other lymphomas in clinical practice and research.
-
C.
APG III classification
APG III classification is a widely used modern system for classifying flowering plants based on molecular phylogenetic evidence, developed by the Angiosperm Phylogeny Group.
-
D.
Library of Congress Classification
Library of Congress Classification is a comprehensive alphanumeric library classification system used primarily by academic and research libraries to organize and arrange their collections by subject.
-
E.
Universal Decimal Classification
Universal Decimal Classification is an international library classification system that organizes knowledge into a detailed, hierarchical numeric scheme used widely in libraries and information centers around the world.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical classification scheme
ⓘ
stellar classification system ⓘ |
| adoptedBy | International astronomical community ⓘ |
| alsoKnownAs |
Harvard spectral classification
ⓘ
linked to:
Harvard spectral classification of stars
|
| associatedWith |
Edward C. Pickering
ⓘ
linked to:
Edward Charles Pickering
Harvard Computers ⓘ
linked to:
Harvard Computers program
|
| basedOn |
stellar spectra
ⓘ
stellar temperature ⓘ |
| classificationBasis | visual inspection of photographic spectra ⓘ |
| classifies | stars ⓘ |
| developedAt | Harvard College Observatory ⓘ |
| developedFrom |
Draper Catalogue of Stellar Spectra
ⓘ
linked to:
Harvard spectral classification of stars
|
| developedInPeriod | early 20th century ⓘ |
| distinguishes |
cool red stars
ⓘ
hot blue stars ⓘ |
| field |
astronomy
ⓘ
astrophysics ⓘ |
| historicalSignificance | first widely adopted temperature-based stellar classification ⓘ |
| influenced | modern stellar spectral classification ⓘ |
| inUseDuring | 20th century ⓘ |
| legacy | letter sequence OBAFGKM retained in modern systems ⓘ |
| orderingCriterion | stellar surface temperature ⓘ |
| originCountry |
United States
ⓘ
linked to:
United States of America
|
| precursorTo |
Morgan–Keenan classification system
ⓘ
linked to:
Harvard spectral classification of stars
|
| primaryParameter |
ionization state of elements in stellar atmospheres
ⓘ
spectral line strength ⓘ |
| refinedBy | Annie Jump Cannon ⓘ |
| spectralTypeACharacteristic | strong hydrogen Balmer lines ⓘ |
| spectralTypeBCharacteristic | hot, neutral helium lines and strong hydrogen lines ⓘ |
| spectralTypeFCharacteristic | weaker hydrogen lines, stronger metal lines ⓘ |
| spectralTypeGCharacteristic | strong metal lines, ionized calcium lines ⓘ |
| spectralTypeKCharacteristic | strong neutral metal lines, some molecular bands ⓘ |
| spectralTypeMCharacteristic | strong molecular bands, especially titanium oxide ⓘ |
| spectralTypeOCharacteristic | very hot, strong ionized helium lines ⓘ |
| standardizedBy |
Annie Jump Cannon at Harvard College Observatory
ⓘ
linked to:
Annie Jump Cannon
|
| temperatureOrder | O B A F G K M (hottest to coolest) ⓘ |
| usesSpectralTypes |
A
ⓘ
B ⓘ F ⓘ G ⓘ K ⓘ M ⓘ O ⓘ |
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: Harvard Classification Scheme Description of subject: The Harvard Classification Scheme is an early 20th-century stellar classification system that organizes stars primarily by their spectral characteristics and temperatures into types such as O, B, A, F, G, K, and M.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.