B33
E557732
B33 is the catalog designation for the Horsehead Nebula, a dark molecular cloud in the constellation Orion whose distinctive silhouette resembles a horse’s head.
All labels observed (1)
| Label | Occurrences |
|---|---|
| B33 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5958677 — 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: B33 Context triple: [Horsehead Nebula, catalogCode, B33]
-
A.
B3
B3 is the third-generation Volkswagen Passat, produced in the early 1990s and known for its aerodynamic, grille-less front design and improved engineering over its predecessors.
-
B.
B3
B3 is Brazil’s main stock exchange, responsible for trading equities, derivatives, and other financial assets in the Brazilian market.
-
C.
B 3
B 3 is a major German federal highway (Bundesstraße) that runs north–south, connecting several important cities across western Germany.
-
D.
S33
S33 is a UK postcode district in the Hope Valley area of Derbyshire, covering several rural villages within the Peak District National Park.
-
E.
BB-33
BB-33 is the hull classification symbol for USS Arkansas, a Wyoming-class battleship that served in the U.S. Navy during both World Wars.
- 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: B33 Target entity description: B33 is the catalog designation for the Horsehead Nebula, a dark molecular cloud in the constellation Orion whose distinctive silhouette resembles a horse’s head.
-
A.
B3
B3 is the third-generation Volkswagen Passat, produced in the early 1990s and known for its aerodynamic, grille-less front design and improved engineering over its predecessors.
-
B.
B3
B3 is Brazil’s main stock exchange, responsible for trading equities, derivatives, and other financial assets in the Brazilian market.
-
C.
B 3
B 3 is a major German federal highway (Bundesstraße) that runs north–south, connecting several important cities across western Germany.
-
D.
S33
S33 is a UK postcode district in the Hope Valley area of Derbyshire, covering several rural villages within the Peak District National Park.
-
E.
BB-33
BB-33 is the hull classification symbol for USS Arkansas, a Wyoming-class battleship that served in the U.S. Navy during both World Wars.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
dark nebula
ⓘ
molecular cloud ⓘ |
| alsoKnownAs | Horsehead Nebula ⓘ |
| angularSize | approximately 8 arcminutes by 6 arcminutes ⓘ |
| appearsIn |
Orion’s Belt region
ⓘ
linked to:
Orion Belt region
|
| backlitBy |
IC 434
ⓘ
linked to:
IC 434 emission nebula
|
| bestSeenFrom | dark-sky sites ⓘ |
| bestSeenWith | long-exposure astrophotography ⓘ |
| cataloguedBy | Edward Emerson Barnard ⓘ |
| catalogueEntryNumber | 33 ⓘ |
| composedPrimarilyOf | molecular hydrogen ⓘ |
| contains |
cold gas
ⓘ
dust ⓘ |
| declination | −02° 27′ 30″ ⓘ |
| distanceFromEarth |
approximately 1375 light-years
ⓘ
approximately 420 parsecs ⓘ |
| hasApparentMagnitude | approximately 6.8 (region as a whole) ⓘ |
| hasCatalogDesignation | B33 ⓘ |
| hasDensity | higher than surrounding IC 434 region ⓘ |
| hasFeature |
bright rim on side facing ionizing radiation
ⓘ
dense pillar-like structure ⓘ |
| hasSilhouetteShape | horse’s head ⓘ |
| hasStructure | clumpy and filamentary gas ⓘ |
| ionizedBy | nearby massive stars in Orion OB1 association ⓘ |
| isDarkAgainst |
emission nebula IC 434
ⓘ
linked to:
IC 434 emission nebula
|
| isIconicFor | its horsehead-shaped silhouette in astrophotography ⓘ |
| isSiteOf | ongoing star formation ⓘ |
| liesIn |
Milky Way galaxy
ⓘ
linked to:
Milky Way
Orion Arm of the Milky Way ⓘ
linked to:
Orion Arm
|
| locatedIn | Orion Molecular Cloud Complex ⓘ |
| locatedInConstellation | Orion ⓘ |
| near |
Flame Nebula NGC 2024
ⓘ
linked to:
Flame Nebula
bright star Alnitak ⓘ reflection nebula NGC 2023 ⓘ
linked to:
NGC 2023 reflection nebula
|
| obscures | background H-alpha emission ⓘ |
| observedBy |
Hubble Space Telescope
ⓘ
Submillimeter and radio observatories ⓘ Very Large Telescope ⓘ |
| observedIn | Barnard Catalogue of Dark Markings in the Sky ⓘ |
| partOf |
Orion B molecular cloud
ⓘ
linked to:
Orion Molecular Cloud Complex
|
| rightAscension | 05h 40m 59s ⓘ |
| spectralFeaturesInclude | molecular lines such as CO ⓘ |
| temperature | about 10 Kelvin in densest regions ⓘ |
| visibleIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
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: B33 Description of subject: B33 is the catalog designation for the Horsehead Nebula, a dark molecular cloud in the constellation Orion whose distinctive silhouette resembles a horse’s head.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.