Crab Nebula
E457107
The Crab Nebula is a famous supernova remnant and pulsar wind nebula in the constellation Taurus, formed by a stellar explosion observed on Earth in 1054 AD.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Crab Nebula canonical | 6 |
How this entity was disambiguated
This entity first appeared as the object of triple T4648527 — 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: Crab Nebula Context triple: [Messier catalogue, notableObjectExample, Crab Nebula]
-
A.
Omega Nebula
The Omega Nebula is a bright, star-forming emission nebula and H II region located in the constellation Sagittarius, known for its distinctive swan-like shape and rich young star clusters.
-
B.
Horsehead Nebula
The Horsehead Nebula is a dark molecular cloud in the constellation Orion, famous for its distinctive horse-head shape silhouetted against a bright emission nebula.
-
C.
Tarantula Nebula
The Tarantula Nebula is an enormous, extremely active star-forming region in the Large Magellanic Cloud and one of the most luminous nebulae known in the Local Group of galaxies.
-
D.
Rosette Nebula
The Rosette Nebula is a large, circular emission nebula and active star-forming region located in the Milky Way, notable for its striking rose-like appearance in astrophotography.
-
E.
Carina Nebula
The Carina Nebula is a vast, active star-forming region in the Milky Way known for its towering gas and dust pillars and dramatic young stellar clusters.
- 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: Crab Nebula Target entity description: The Crab Nebula is a famous supernova remnant and pulsar wind nebula in the constellation Taurus, formed by a stellar explosion observed on Earth in 1054 AD.
-
A.
Omega Nebula
The Omega Nebula is a bright, star-forming emission nebula and H II region located in the constellation Sagittarius, known for its distinctive swan-like shape and rich young star clusters.
-
B.
Horsehead Nebula
The Horsehead Nebula is a dark molecular cloud in the constellation Orion, famous for its distinctive horse-head shape silhouetted against a bright emission nebula.
-
C.
Tarantula Nebula
The Tarantula Nebula is an enormous, extremely active star-forming region in the Large Magellanic Cloud and one of the most luminous nebulae known in the Local Group of galaxies.
-
D.
Rosette Nebula
The Rosette Nebula is a large, circular emission nebula and active star-forming region located in the Milky Way, notable for its striking rose-like appearance in astrophotography.
-
E.
Carina Nebula
The Carina Nebula is a vast, active star-forming region in the Milky Way known for its towering gas and dust pillars and dramatic young stellar clusters.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
emission nebula ⓘ pulsar ⓘ pulsar wind nebula ⓘ supernova remnant ⓘ |
| alsoKnownAs |
M1
ⓘ
Messier 1 ⓘ NGC 1952 ⓘ |
| associatedWithHistoricalRecord | guest star of 1054 ⓘ |
| cataloguedBy | Charles Messier ⓘ |
| contains |
Crab Pulsar
ⓘ
linked to:
Pulsar
|
| discoveredBy | John Bevis ⓘ |
| discoveryYear | 1731 ⓘ |
| emits |
X-rays
ⓘ
gamma rays ⓘ optical radiation ⓘ radio waves ⓘ synchrotron radiation ⓘ |
| expandsAtSpeed | about 1500 km/s ⓘ |
| hasAngularSize | about 7 arcminutes by 5 arcminutes ⓘ |
| hasApparentMagnitude | 8.4 ⓘ |
| hasApproximateDistance |
2 kiloparsecs
ⓘ
6500 light-years ⓘ |
| hasCentralObject |
Crab Pulsar
ⓘ
linked to:
PSR B0531+21
|
| hasDeclination | +22° 01′ ⓘ |
| hasDesignation | PSR B0531+21 ⓘ |
| hasDiameter | about 11 light-years ⓘ |
| hasGalacticLatitude | -5.78 degrees ⓘ |
| hasGalacticLongitude | 184.56 degrees ⓘ |
| hasRightAscension | 05h 34m ⓘ |
| hasRotationPeriod | about 33 milliseconds ⓘ |
| hasSpectralType | non-thermal synchrotron continuum with emission lines ⓘ |
| isInMilkyWay | true ⓘ |
| isPrototypeOf | pulsar wind nebulae ⓘ |
| locatedIn | Crab Nebula ⓘ |
| locatedInConstellation | Taurus ⓘ |
| messierNumber | 1 ⓘ |
| ngcNumber | 1952 ⓘ |
| originatedFrom | core-collapse supernova ⓘ |
| supernovaObservedBy |
Arab astronomers
ⓘ
Chinese astronomers ⓘ Japanese astronomers ⓘ |
| supernovaObservedFromEarthInYear | 1054 ⓘ |
| supernovaVisibleInDaylightFor | about 23 days ⓘ |
| supernovaVisibleToNakedEyeFor | about 2 years ⓘ |
| usedAsStandard |
X-ray astronomy flux calibrator
ⓘ
gamma-ray astronomy flux calibrator ⓘ |
| visibleWith | small telescope ⓘ |
| wasFormedByEvent | SN 1054 ⓘ |
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: Crab Nebula Description of subject: The Crab Nebula is a famous supernova remnant and pulsar wind nebula in the constellation Taurus, formed by a stellar explosion observed on Earth in 1054 AD.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.