Messier 77
E591822
Messier 77 is a bright barred spiral galaxy and active galactic nucleus located in the constellation Cetus, known as one of the nearest and most studied Seyfert galaxies.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 77 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T6431303 — 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: Messier 77 Context triple: [Cetus, containsDeepSkyObject, Messier 77]
-
A.
Messier 81
Messier 81 is a prominent, nearby grand-design spiral galaxy in the constellation Ursa Major, notable for its brightness and well-defined structure.
-
B.
Messier 82
Messier 82, also known as the Cigar Galaxy, is a nearby starburst galaxy in Ursa Major undergoing intense star formation and strong galactic winds.
-
C.
Messier79
Messier 79 is a dense globular star cluster located in the constellation Lepus, composed of hundreds of thousands of ancient stars.
-
D.
Messier 32
Messier 32 is a compact dwarf elliptical galaxy that is a satellite of the Andromeda Galaxy in the Local Group.
-
E.
Messier 83
Messier 83 is a bright, nearby barred spiral galaxy in the constellation Hydra, notable for its vigorous star formation and frequent supernovae.
- 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: Messier 77 Target entity description: Messier 77 is a bright barred spiral galaxy and active galactic nucleus located in the constellation Cetus, known as one of the nearest and most studied Seyfert galaxies.
-
A.
Messier 81
Messier 81 is a prominent, nearby grand-design spiral galaxy in the constellation Ursa Major, notable for its brightness and well-defined structure.
-
B.
Messier 82
Messier 82, also known as the Cigar Galaxy, is a nearby starburst galaxy in Ursa Major undergoing intense star formation and strong galactic winds.
-
C.
Messier79
Messier 79 is a dense globular star cluster located in the constellation Lepus, composed of hundreds of thousands of ancient stars.
-
D.
Messier 32
Messier 32 is a compact dwarf elliptical galaxy that is a satellite of the Andromeda Galaxy in the Local Group.
-
E.
Messier 83
Messier 83 is a bright, nearby barred spiral galaxy in the constellation Hydra, notable for its vigorous star formation and frequent supernovae.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
Seyfert galaxy
ⓘ
barred spiral galaxy ⓘ |
| activityType | Seyfert type II nucleus ⓘ |
| alsoKnownAs |
Arp 37
NERFINISHED
ⓘ
M77 NERFINISHED ⓘ NGC 1068 NERFINISHED ⓘ |
| apparentMagnitudeV | 8.9 ⓘ |
| arpNumber | 37 ⓘ |
| bestSeenIn | autumn months from northern hemisphere ⓘ |
| cataloguedBy | Charles Messier NERFINISHED ⓘ |
| constellation | Cetus NERFINISHED ⓘ |
| declination | −00° 00′ 48″ ⓘ |
| diameter | about 170000 light-years ⓘ |
| discoverer | Pierre Méchain NERFINISHED ⓘ |
| discoveryDate | 1780 ⓘ |
| distanceFromEarth |
about 14.4 megaparsecs
ⓘ
about 47 million light-years ⓘ |
| galaxyType | barred spiral galaxy ⓘ |
| hasClassification | radio-quiet AGN ⓘ |
| hasDustStructure | circumnuclear dust torus ⓘ |
| hasFeature |
bright active nucleus
ⓘ
prominent central bar ⓘ strong emission lines in spectrum ⓘ well-defined spiral arms ⓘ |
| hasStarFormation | enhanced circumnuclear starburst region ⓘ |
| hostGalaxyOf | supermassive black hole ⓘ |
| isOneOf |
best-studied active galactic nuclei
ⓘ
nearest Seyfert galaxies ⓘ |
| isTargetFor |
amateur astronomers
ⓘ
professional observatories ⓘ |
| locatedIn | local universe ⓘ |
| messierNumber | 77 ⓘ |
| morphologicalType | (R)SA(rs)b ⓘ |
| ngcNumber | 1068 ⓘ |
| observedIn |
X-ray wavelengths
ⓘ
infrared wavelengths ⓘ optical wavelengths ⓘ radio wavelengths ⓘ |
| partOf | Cetus constellation region NERFINISHED ⓘ |
| radialVelocity | 1137 km/s ⓘ |
| redshift | 0.003793 ⓘ |
| rightAscension | 02h 42m 40.7s ⓘ |
| supermassiveBlackHoleMass | about 10 million solar masses ⓘ |
| visibleIn | small telescopes ⓘ |
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: Messier 77 Description of subject: Messier 77 is a bright barred spiral galaxy and active galactic nucleus located in the constellation Cetus, known as one of the nearest and most studied Seyfert galaxies.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.