NGC 147
E459118
NGC 147 is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
All labels observed (2)
| Label | Occurrences |
|---|---|
| NGC 147 canonical | 6 |
| NGC 147–NGC 185 pair | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4618840 — 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: NGC 147 Context triple: [LG, containsGalaxy, NGC 147]
-
A.
NGC 1432
NGC 1432 is a reflection nebula in the constellation Taurus that is part of the Pleiades (Seven Sisters) star cluster.
-
B.
NGC 7317
NGC 7317 is an elliptical galaxy that forms part of Stephan's Quintet, a famous compact group of interacting galaxies in the constellation Pegasus.
-
C.
Messier 54
Messier 54 is a dense globular star cluster located in the constellation Sagittarius, notable for being one of the first globular clusters found to belong to a dwarf galaxy outside the Milky Way.
-
D.
NGC 205
NGC 205 is a dwarf elliptical satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Local Group’s largest spiral and its mixed old and young stellar populations.
-
E.
NGC 7319
NGC 7319 is a barred spiral galaxy in the constellation Pegasus, notable as a member of the interacting galaxy group known as Stephan's Quintet.
- 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: NGC 147 Target entity description: NGC 147 is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
-
A.
NGC 1432
NGC 1432 is a reflection nebula in the constellation Taurus that is part of the Pleiades (Seven Sisters) star cluster.
-
B.
NGC 7317
NGC 7317 is an elliptical galaxy that forms part of Stephan's Quintet, a famous compact group of interacting galaxies in the constellation Pegasus.
-
C.
Messier 54
Messier 54 is a dense globular star cluster located in the constellation Sagittarius, notable for being one of the first globular clusters found to belong to a dwarf galaxy outside the Milky Way.
-
D.
NGC 205
NGC 205 is a dwarf elliptical satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Local Group’s largest spiral and its mixed old and young stellar populations.
-
E.
NGC 7319
NGC 7319 is a barred spiral galaxy in the constellation Pegasus, notable as a member of the interacting galaxy group known as Stephan's Quintet.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
dwarf spheroidal galaxy ⓘ galaxy ⓘ satellite galaxy ⓘ |
| absoluteMagnitudeV | about −15.1 ⓘ |
| alsoKnownAs |
DDO 3
ⓘ
PGC 2004 ⓘ UGC 326 ⓘ |
| angularSize | about 13.2 arcminutes ⓘ |
| apparentMagnitudeV | about 9.5 ⓘ |
| belongsTo |
Local Group dwarf spheroidal galaxies
ⓘ
linked to:
Local Group dwarf galaxies
|
| catalog | New General Catalogue ⓘ |
| constellation | Cassiopeia ⓘ |
| contains | globular clusters ⓘ |
| coordinateSystem | equatorial coordinate system ⓘ |
| darkMatterContent | dark-matter dominated ⓘ |
| declination | +48° 30′ ⓘ |
| discoveredBy | John Herschel ⓘ |
| discoveryDate | 8 September 1829 ⓘ |
| distanceFromAndromedaGalaxy | about 120 kiloparsecs ⓘ |
| distanceFromEarth |
about 2.3 million light-years
ⓘ
about 700 kiloparsecs ⓘ |
| environment | halo of the Andromeda Galaxy ⓘ |
| galaxyType | early-type dwarf galaxy ⓘ |
| gasContent | gas-poor ⓘ |
| groupMembership |
NGC 147–NGC 185 pair
ⓘ
linked to:
NGC 147
|
| hemisphere | northern sky ⓘ |
| hostGalaxy | Andromeda Galaxy ⓘ |
| isNeighborOf | NGC 185 ⓘ |
| luminosity | of order 10^7 solar luminosities ⓘ |
| mass | of order 10^8 solar masses ⓘ |
| memberOf | Local Group ⓘ |
| metallicity | low metallicity ⓘ |
| morphologicalType | dSph ⓘ |
| nearbyGalaxy | NGC 185 ⓘ |
| observationalDifficulty | requires dark skies and moderate aperture to resolve ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ |
| positionRelativeToAndromeda | northwest of the Andromeda Galaxy ⓘ |
| radialVelocity | about −193 km/s ⓘ |
| redshift | about −0.00068 ⓘ |
| rightAscension | 00h 33m ⓘ |
| satelliteOf | Andromeda Galaxy ⓘ |
| starFormationActivity | no current star formation ⓘ |
| starFormationHistory | star formation ceased several Gyr ago ⓘ |
| stellarPopulation | dominated by old stars ⓘ |
| surfaceBrightness | low surface brightness ⓘ |
| surfaceBrightnessProfile | smooth and diffuse ⓘ |
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: NGC 147 Description of subject: NGC 147 is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy located in the Local Group.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: NGC 147