Messier 1
E461993
Messier 1, also known as the Crab Nebula, is a supernova remnant and pulsar wind nebula in the constellation Taurus, famous as the first object in Charles Messier’s catalog.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 1 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4648489 — 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 1 Context triple: [Messier catalogue, contains, Messier 1]
-
A.
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.
-
B.
Messier 11
Messier 11 is a rich, compact open star cluster in the constellation Scutum, notable for its high stellar density and nickname "the Wild Duck Cluster."
-
C.
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.
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D.
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.
-
E.
Messier 24
Messier 24 is a rich star cloud in the constellation Sagittarius, representing a dense, bright section of the Milky Way visible through a gap in interstellar dust.
- 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 1 Target entity description: Messier 1, also known as the Crab Nebula, is a supernova remnant and pulsar wind nebula in the constellation Taurus, famous as the first object in Charles Messier’s catalog.
-
A.
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.
-
B.
Messier 11
Messier 11 is a rich, compact open star cluster in the constellation Scutum, notable for its high stellar density and nickname "the Wild Duck Cluster."
-
C.
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.
-
D.
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.
-
E.
Messier 24
Messier 24 is a rich star cloud in the constellation Sagittarius, representing a dense, bright section of the Milky Way visible through a gap in interstellar dust.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
NGC object ⓘ astronomical object ⓘ pulsar wind nebula ⓘ supernova remnant ⓘ |
| age | about 970 years ⓘ |
| angularSize | about 7 by 5 arcminutes ⓘ |
| apparentMagnitudeV | 8.4 ⓘ |
| associatedWith | Crab Pulsar NERFINISHED ⓘ |
| bestSeenIn | winter sky ⓘ |
| catalogNumber |
M1
NERFINISHED
ⓘ
NGC 1952 NERFINISHED ⓘ |
| cataloguedBy | Charles Messier NERFINISHED ⓘ |
| contains | Crab Pulsar NERFINISHED ⓘ |
| declination | +22° 00′ 52.1″ ⓘ |
| discoveredBy | John Bevis NERFINISHED ⓘ |
| discoveryYear | 1731 ⓘ |
| distanceFromEarth |
about 2.0 kiloparsecs
ⓘ
about 6500 light-years ⓘ |
| emits |
X-rays
ⓘ
gamma rays ⓘ optical radiation ⓘ radio waves ⓘ |
| epoch | J2000 ⓘ |
| expansionVelocity | about 1500 km/s ⓘ |
| hasAlternativeName | Sharpless 244 NERFINISHED ⓘ |
| hasCentralObject |
Crab Pulsar
NERFINISHED
ⓘ
neutron star ⓘ |
| hasMorphology |
filamentary structure
ⓘ
synchrotron nebula ⓘ |
| hasName |
Crab Nebula
NERFINISHED
ⓘ
M1 NERFINISHED ⓘ NGC 1952 NERFINISHED ⓘ |
| hasRedshift | z ≈ 0.0 ⓘ |
| locatedIn |
Milky Way
ⓘ
Perseus Arm NERFINISHED ⓘ |
| locatedInConstellation | Taurus NERFINISHED ⓘ |
| locatedNear | Zeta Tauri NERFINISHED ⓘ |
| notableFor | being first object in Messier catalog ⓘ |
| observedAs | guest star ⓘ |
| observedBy |
Chinese astronomers
ⓘ
Japanese astronomers ⓘ |
| pulsarSpinFrequency | about 30 Hz ⓘ |
| pulsarSpinPeriod | about 33 milliseconds ⓘ |
| rightAscension | 05h 34m 31.97s ⓘ |
| spectralType | emission nebula ⓘ |
| supernovaEventDesignation | SN 1054 NERFINISHED ⓘ |
| supernovaExplosionYear | 1054 ⓘ |
| 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 1 Description of subject: Messier 1, also known as the Crab Nebula, is a supernova remnant and pulsar wind nebula in the constellation Taurus, famous as the first object in Charles Messier’s catalog.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.