NGC 5128
E472709
NGC 5128, also known as Centaurus A, is a nearby peculiar elliptical galaxy with a prominent dust lane and one of the strongest radio sources in the sky.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Centaurus A | 8 |
| NGC 5128 canonical | 5 |
| Centaurus A (NGC 5128) | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4835279 — 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 5128 Context triple: [Centaurus A/M83 Group, containsGalaxy, NGC 5128]
-
A.
NGC 6872
NGC 6872 is a highly elongated barred spiral galaxy in the constellation Pavo, notable for being one of the largest known spiral galaxies and for its dramatic tidal interaction with a nearby companion.
-
B.
NGC 3372
NGC 3372 is a massive, bright star-forming nebula in the Carina constellation, famous for housing the unstable supergiant star Eta Carinae and extensive regions of ionized gas and dust.
-
C.
NGC 4725
NGC 4725 is a barred spiral galaxy in the constellation Coma Berenices, notable for having only one prominent spiral arm.
-
D.
NGC 2976
NGC 2976 is a nearby dwarf spiral galaxy in the constellation Ursa Major and a member of the M81 Group of galaxies.
-
E.
NGC 1432
NGC 1432 is a reflection nebula in the constellation Taurus that is part of the Pleiades (Seven Sisters) star 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 5128 Target entity description: NGC 5128, also known as Centaurus A, is a nearby peculiar elliptical galaxy with a prominent dust lane and one of the strongest radio sources in the sky.
-
A.
NGC 6872
NGC 6872 is a highly elongated barred spiral galaxy in the constellation Pavo, notable for being one of the largest known spiral galaxies and for its dramatic tidal interaction with a nearby companion.
-
B.
NGC 3372
NGC 3372 is a massive, bright star-forming nebula in the Carina constellation, famous for housing the unstable supergiant star Eta Carinae and extensive regions of ionized gas and dust.
-
C.
NGC 4725
NGC 4725 is a barred spiral galaxy in the constellation Coma Berenices, notable for having only one prominent spiral arm.
-
D.
NGC 2976
NGC 2976 is a nearby dwarf spiral galaxy in the constellation Ursa Major and a member of the M81 Group of galaxies.
-
E.
NGC 1432
NGC 1432 is a reflection nebula in the constellation Taurus that is part of the Pleiades (Seven Sisters) star cluster.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
elliptical galaxy
ⓘ
galaxy ⓘ peculiar galaxy ⓘ radio galaxy ⓘ |
| alsoKnownAs |
Cen A
ⓘ
linked to:
Cen
Centaurus A ⓘ
linked to:
NGC 5128
|
| angularSize | approximately 25 by 20 arcminutes ⓘ |
| apparentMagnitudeV | approximately 6.8 ⓘ |
| belongsToCatalog |
Caldwell catalog
ⓘ
linked to:
Caldwell catalogue
New General Catalogue ⓘ PKS radio source catalog ⓘ |
| bestSeenIn |
X-ray wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
| CaldwellNumber | C77 ⓘ |
| catalogCode |
Cen A
ⓘ
linked to:
Cen
NGC 5128 ⓘ PKS 1322-428 ⓘ |
| centralBlackHoleMass | on the order of 10^8 solar masses ⓘ |
| contains | supermassive black hole ⓘ |
| declination | −43° 01′ 09″ ⓘ |
| discoveredBy | James Dunlop ⓘ |
| discoveryYear | 1826 ⓘ |
| distanceFromEarth |
approximately 10 to 13 million light-years
ⓘ
approximately 3 to 4 megaparsecs ⓘ |
| hasActivityType |
AGN
ⓘ
FR I radio galaxy ⓘ Seyfert-like nucleus ⓘ |
| hasFeature |
X-ray emission
ⓘ
active galactic nucleus ⓘ gamma-ray emission ⓘ large radio lobes ⓘ prominent dust lane ⓘ relativistic jets ⓘ strong radio emission ⓘ |
| isOneOf |
nearest radio galaxies to Earth
ⓘ
strongest extragalactic radio sources in the sky ⓘ |
| locatedInConstellation | Centaurus ⓘ |
| mass | on the order of 10^12 solar masses ⓘ |
| morphologicalType |
Epec
ⓘ
peculiar elliptical ⓘ |
| observableFrom | Southern Hemisphere ⓘ |
| radialVelocity | approximately 550 km/s ⓘ |
| redshift | 0.00183 ⓘ |
| rightAscension | 13h 25m 27.6s ⓘ |
| showsEvidenceOf |
past galaxy merger
ⓘ
recent star formation ⓘ shell structures in stellar halo ⓘ |
| stellarMass | on the order of a few 10^11 solar masses ⓘ |
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 5128 Description of subject: NGC 5128, also known as Centaurus A, is a nearby peculiar elliptical galaxy with a prominent dust lane and one of the strongest radio sources in the sky.
Referenced by (15)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: NGC 5128
linked to: NGC 5128
linked to: NGC 5128
linked to: NGC 5128
linked to: NGC 5128
linked to: NGC 5128
linked to: NGC 5128
linked to: NGC 5128
linked to: NGC 5128
linked to: NGC 5128