M31*
E110379
M31* is the supermassive black hole located at the core of the Andromeda Galaxy.
All labels observed (1)
| Label | Occurrences |
|---|---|
| M31* canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T924565 — 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: M31* Context triple: [Andromeda Galaxy, centralBlackHoleName, M31*]
-
A.
Triangulum Galaxy
The Triangulum Galaxy is a nearby spiral galaxy in the Local Group, notable as one of the closest large galaxies to the Milky Way and a companion to the Andromeda Galaxy.
-
B.
globular star cluster M13
Globular star cluster M13, also known as the Great Hercules Cluster, is a dense, bright spherical collection of hundreds of thousands of ancient stars located in the constellation Hercules and is one of the most prominent globular clusters visible from Earth.
-
C.
Andromeda I
Andromeda I is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy (M31) located within the Local Group.
-
D.
M81 Group
The M81 Group is a nearby collection of galaxies in the constellation Ursa Major, dominated by the large spiral galaxy Messier 81 and known for its interacting members and active star formation.
-
E.
Messier 8
Messier 8, also known as the Lagoon Nebula, is a large, bright emission nebula and active star-forming region visible in the constellation Sagittarius.
- 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: M31* Target entity description: M31* is the supermassive black hole located at the core of the Andromeda Galaxy.
-
A.
Triangulum Galaxy
The Triangulum Galaxy is a nearby spiral galaxy in the Local Group, notable as one of the closest large galaxies to the Milky Way and a companion to the Andromeda Galaxy.
-
B.
globular star cluster M13
Globular star cluster M13, also known as the Great Hercules Cluster, is a dense, bright spherical collection of hundreds of thousands of ancient stars located in the constellation Hercules and is one of the most prominent globular clusters visible from Earth.
-
C.
Andromeda I
Andromeda I is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy (M31) located within the Local Group.
-
D.
M81 Group
The M81 Group is a nearby collection of galaxies in the constellation Ursa Major, dominated by the large spiral galaxy Messier 81 and known for its interacting members and active star formation.
-
E.
Messier 8
Messier 8, also known as the Lagoon Nebula, is a large, bright emission nebula and active star-forming region visible in the constellation Sagittarius.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
supermassive black hole ⓘ |
| alternativeName |
Andromeda central supermassive black hole
ⓘ
central black hole of Andromeda ⓘ |
| belongsToSystem | nuclear star cluster of Andromeda ⓘ |
| category |
central black holes of spiral galaxies
ⓘ
supermassive black holes in nearby galaxies ⓘ |
| centralRole | dominant mass concentration in the nucleus of Andromeda ⓘ |
| comparedTo |
less massive than Sagittarius A*
ⓘ
less massive than many quasar black holes ⓘ |
| discoveredIn | 20th century ⓘ |
| distanceFromEarth |
approximately 2.5 million light-years
ⓘ
approximately 780 kiloparsecs ⓘ |
| emissionType |
X-ray emission
ⓘ
radio emission ⓘ |
| environment |
central bulge of Andromeda
ⓘ
dense nuclear stellar cluster ⓘ |
| evidenceType |
X-ray observations
ⓘ
gas kinematics ⓘ stellar dynamics ⓘ |
| galaxyTypeOfHost | barred spiral galaxy ⓘ |
| gravitationalEffect |
governs orbits of nearby nuclear stars
ⓘ
influences dynamics of central gas in Andromeda ⓘ |
| hasAccretionActivity | low-luminosity active nucleus ⓘ |
| hasProperty |
accretion flow
ⓘ
event horizon ⓘ very strong gravitational field ⓘ |
| hostGalaxy | Andromeda Galaxy ⓘ |
| hostGalaxyConstellation |
Andromeda
ⓘ
linked to:
Andromeda Galaxy
|
| hostGalaxyDistanceFromEarth | approximately 2.5 million light-years ⓘ |
| hostGalaxyMessierNumber |
M31
ⓘ
linked to:
Andromeda Galaxy
|
| hostGalaxyNGCNumber | NGC 224 ⓘ |
| locatedIn |
Andromeda Galaxy
ⓘ
Local Group ⓘ Virgo Supercluster ⓘ core of the Andromeda Galaxy ⓘ observable universe ⓘ |
| mass |
approximately 1.4e8 solar masses
ⓘ
on the order of 100 million solar masses ⓘ |
| observedBy |
Chandra X-ray Observatory
ⓘ
Hubble Space Telescope ⓘ ground-based optical telescopes ⓘ radio telescopes ⓘ |
| partOf | Andromeda Galaxy nucleus ⓘ |
| redshift | approximately -0.001 ⓘ |
| researchField |
black hole astrophysics
ⓘ
galactic nuclei ⓘ |
| roleInGalaxyEvolution | influences evolution of Andromeda’s central region ⓘ |
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: M31* Description of subject: M31* is the supermassive black hole located at the core of the Andromeda Galaxy.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.