NGC 4639
E525085
NGC 4639 is a barred spiral galaxy in the constellation Virgo that hosts an active galactic nucleus and lies on the outskirts of the Virgo Cluster.
All labels observed (1)
| Label | Occurrences |
|---|---|
| NGC 4639 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5410460 — 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 4639 Context triple: [Virgo Cluster, containsGalaxy, NGC 4639]
-
A.
NGC 4609
NGC 4609 is an open star cluster located in the southern constellation Centaurus, notable for its relatively young stellar population.
-
B.
NGC 4622
NGC 4622 is an unusual spiral galaxy notable for its rare leading spiral arms and distinctive ring-like structure, located in the constellation Centaurus.
-
C.
NGC 4569
NGC 4569 is a bright, gas-stripped spiral galaxy in the Virgo Cluster notable for its unusually low star formation and strong nuclear activity.
-
D.
NGC 4388
NGC 4388 is an edge-on spiral galaxy with an active galactic nucleus located in the Virgo Cluster, notable for its strong emission lines and interaction with the cluster environment.
-
E.
NGC 4579
NGC 4579 is a barred spiral galaxy with an active galactic nucleus located in the constellation Virgo and associated with the Virgo Cluster.
- 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 4639 Target entity description: NGC 4639 is a barred spiral galaxy in the constellation Virgo that hosts an active galactic nucleus and lies on the outskirts of the Virgo Cluster.
-
A.
NGC 4609
NGC 4609 is an open star cluster located in the southern constellation Centaurus, notable for its relatively young stellar population.
-
B.
NGC 4622
NGC 4622 is an unusual spiral galaxy notable for its rare leading spiral arms and distinctive ring-like structure, located in the constellation Centaurus.
-
C.
NGC 4569
NGC 4569 is a bright, gas-stripped spiral galaxy in the Virgo Cluster notable for its unusually low star formation and strong nuclear activity.
-
D.
NGC 4388
NGC 4388 is an edge-on spiral galaxy with an active galactic nucleus located in the Virgo Cluster, notable for its strong emission lines and interaction with the cluster environment.
-
E.
NGC 4579
NGC 4579 is a barred spiral galaxy with an active galactic nucleus located in the constellation Virgo and associated with the Virgo Cluster.
- F. None of above. chosen
Statements (38)
| Predicate | Object |
|---|---|
| instanceOf |
Seyfert galaxy
ⓘ
active galaxy ⓘ barred spiral galaxy ⓘ |
| discoveredBy | William Herschel NERFINISHED ⓘ |
| discoveryDate | 1784 ⓘ |
| hasActiveGalacticNucleusType | Seyfert 1 NERFINISHED ⓘ |
| hasActiveNucleus | true ⓘ |
| hasAngularSize | 2.9′ × 2.5′ ⓘ |
| hasApparentMagnitudeV | 11.5 ⓘ |
| hasBarStructure | true ⓘ |
| hasDeclination | +13° 15′ 27″ ⓘ |
| hasDistance |
~21.5 Mpc
ⓘ
~70 million light-years ⓘ |
| hasEquatorialCoordinateSystem | J2000 ⓘ |
| hasGalaxyClusterEnvironment | cluster outskirts ⓘ |
| hasGalaxyTypeCode | SAB(rs)bc ⓘ |
| hasHostGalaxyBar | weak bar ⓘ |
| hasHubbleStage | bc ⓘ |
| hasInclination | moderately inclined to line of sight ⓘ |
| hasLowLuminosityAGN | true ⓘ |
| hasMorphologicalType | SAB(rs)bc ⓘ |
| hasNGCNumber | 4639 ⓘ |
| hasNuclearActivity | broad emission lines ⓘ |
| hasRadialVelocity | 1018 km/s ⓘ |
| hasRedshift | 0.003395 ⓘ |
| hasRightAscension | 12h 42m 52.4s ⓘ |
| hasRingStructure | true ⓘ |
| hasStarFormation | ongoing in spiral arms ⓘ |
| hasSupermassiveBlackHole | true ⓘ |
| isCatalogedAs |
PGC 42741
NERFINISHED
ⓘ
UGC 7884 NERFINISHED ⓘ |
| isCatalogedIn | New General Catalogue NERFINISHED ⓘ |
| isInSupercluster | Virgo Supercluster NERFINISHED ⓘ |
| isPartOf | Virgo constellation region of the sky ⓘ |
| liesOnOutskirtsOf | Virgo Cluster NERFINISHED ⓘ |
| locatedInConstellation | Virgo NERFINISHED ⓘ |
| memberOf | Virgo Cluster NERFINISHED ⓘ |
| observedBy | Hubble Space Telescope NERFINISHED ⓘ |
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 4639 Description of subject: NGC 4639 is a barred spiral galaxy in the constellation Virgo that hosts an active galactic nucleus and lies on the outskirts of the Virgo Cluster.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.