DDO
E559336
DDO is a catalog of dwarf galaxies, particularly irregular and low-surface-brightness systems, widely used in extragalactic astronomy.
All labels observed (2)
How this entity was disambiguated
This entity first appeared as the object of triple T5966597 — 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: DDO Context triple: [Pegasus Dwarf Irregular Galaxy, catalog, DDO]
-
A.
DDO 53
DDO 53 is a faint dwarf irregular galaxy that is a member of the nearby M81 Group in the constellation Ursa Major.
-
B.
DDO 208
DDO 208 is a faint dwarf spheroidal galaxy in the constellation Draco that is one of the Milky Way’s satellite galaxies.
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C.
DDF
DDF is the commonly used abbreviation for the Dicastery for the Doctrine of the Faith, the Vatican department responsible for promoting and safeguarding Catholic doctrine.
-
D.
DDO 74
DDO 74 is a faint dwarf spheroidal galaxy in the constellation Leo and a satellite of the Milky Way, commonly known as the Leo I Dwarf Galaxy.
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E.
DDO 82
DDO 82 is a dwarf irregular galaxy that is a member of the nearby M81 Group of galaxies.
- 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: DDO Target entity description: DDO is a catalog of dwarf galaxies, particularly irregular and low-surface-brightness systems, widely used in extragalactic astronomy.
-
A.
DDO 53
DDO 53 is a faint dwarf irregular galaxy that is a member of the nearby M81 Group in the constellation Ursa Major.
-
B.
DDO 208
DDO 208 is a faint dwarf spheroidal galaxy in the constellation Draco that is one of the Milky Way’s satellite galaxies.
-
C.
DDF
DDF is the commonly used abbreviation for the Dicastery for the Doctrine of the Faith, the Vatican department responsible for promoting and safeguarding Catholic doctrine.
-
D.
DDO 74
DDO 74 is a faint dwarf spheroidal galaxy in the constellation Leo and a satellite of the Milky Way, commonly known as the Leo I Dwarf Galaxy.
-
E.
DDO 82
DDO 82 is a dwarf irregular galaxy that is a member of the nearby M81 Group of galaxies.
- F. None of above. chosen
Statements (41)
| Predicate | Object |
|---|---|
| instanceOf | astronomical catalog ⓘ |
| alsoKnownAs |
DDO dwarf galaxy catalog
ⓘ
David Dunlap Observatory dwarf galaxy catalog ⓘ |
| citedIn | extragalactic astronomy literature ⓘ |
| compiledBy | David Dunlap Observatory ⓘ |
| contains |
Local Group dwarf galaxies
ⓘ
nearby field dwarf galaxies ⓘ |
| coordinateSystem | equatorial coordinates ⓘ |
| dataIncludes |
angular size
ⓘ
apparent magnitude ⓘ morphological classification ⓘ sky position ⓘ |
| dataType | observational data ⓘ |
| domain | nearby universe ⓘ |
| field | extragalactic astronomy ⓘ |
| focusesOn |
dwarf galaxies
ⓘ
irregular galaxies ⓘ low-surface-brightness galaxies ⓘ |
| fullName | David Dunlap Observatory Catalogue of dwarf galaxies ⓘ |
| hasEntryExample |
DDO 154
ⓘ
DDO 168 ⓘ DDO 50 ⓘ |
| language | English ⓘ |
| relatedTo |
IC
ⓘ
NGC ⓘ UGC ⓘ |
| scope | nearby dwarf irregular and low-surface-brightness systems ⓘ |
| selectionCriterion |
irregular morphology
ⓘ
low luminosity ⓘ low surface brightness ⓘ small physical size ⓘ |
| status | widely used reference catalog in extragalactic astronomy ⓘ |
| usedBy |
extragalactic researchers
ⓘ
professional astronomers ⓘ |
| usedFor |
dark matter content studies in dwarf galaxies
ⓘ
distance scale calibration in the nearby universe ⓘ kinematic studies of dwarf galaxies ⓘ star formation studies in low-mass galaxies ⓘ studies of galaxy evolution ⓘ studies of galaxy morphology ⓘ studies of nearby dwarf galaxies ⓘ |
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: DDO Description of subject: DDO is a catalog of dwarf galaxies, particularly irregular and low-surface-brightness systems, widely used in extragalactic astronomy.
Referenced by (11)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: DDO
linked to: DDO