M42
E459020
M42, also known as the Orion Nebula, is a bright, nearby stellar nursery where new stars are actively forming within the constellation Orion.
All labels observed (1)
| Label | Occurrences |
|---|---|
| M42 canonical | 8 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617557 — 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: M42 Context triple: [Orion Molecular Cloud Complex, contains, M42]
-
A.
M42
M42 is a major motorway in the West Midlands region of England that forms part of the orbital route around Birmingham and connects several key motorways.
-
B.
M45
M45 is the Pleiades, a prominent open star cluster in the constellation Taurus visible to the naked eye and known since antiquity.
-
C.
M44
M44 is an open star cluster in the constellation Cancer, also known as the Beehive Cluster or Praesepe, and is one of the nearest and most prominent clusters visible to the naked eye.
-
D.
M67
M67 is a short motorway in Greater Manchester, England, connecting the M60 near Denton towards Hyde and intended as the first section of an unrealized trans-Pennine route.
-
E.
M-24
M-24 is a state highway in Michigan that serves as a key north–south transportation route through communities such as Orion Township.
- 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: M42 Target entity description: M42, also known as the Orion Nebula, is a bright, nearby stellar nursery where new stars are actively forming within the constellation Orion.
-
A.
M42
M42 is a major motorway in the West Midlands region of England that forms part of the orbital route around Birmingham and connects several key motorways.
-
B.
M45
M45 is the Pleiades, a prominent open star cluster in the constellation Taurus visible to the naked eye and known since antiquity.
-
C.
M44
M44 is an open star cluster in the constellation Cancer, also known as the Beehive Cluster or Praesepe, and is one of the nearest and most prominent clusters visible to the naked eye.
-
D.
M67
M67 is a short motorway in Greater Manchester, England, connecting the M60 near Denton towards Hyde and intended as the first section of an unrealized trans-Pennine route.
-
E.
M-24
M-24 is a state highway in Michigan that serves as a key north–south transportation route through communities such as Orion Township.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
Messier object ⓘ NGC object ⓘ diffuse nebula ⓘ emission nebula ⓘ star-forming region ⓘ |
| alsoKnownAs |
Messier 42
ⓘ
NGC 1976 ⓘ Orion Nebula ⓘ |
| angularSize | about 65×60 arcminutes ⓘ |
| apparentMagnitudeV | about 4.0 ⓘ |
| bestSeenIn | winter sky of the Northern Hemisphere ⓘ |
| cataloguedBy |
Charles Messier
ⓘ
Nicolas-Claude Fabri de Peiresc ⓘ |
| contains |
Herbig–Haro objects
ⓘ
Theta1 Orionis A ⓘ Theta1 Orionis B ⓘ Theta1 Orionis C ⓘ Theta1 Orionis D ⓘ Trapezium Cluster ⓘ dark nebula structures ⓘ massive OB association stars ⓘ protoplanetary disks ⓘ reflection nebula components ⓘ young stellar objects ⓘ |
| declination | −05° 23′ ⓘ |
| distanceFromEarth |
about 1,344 light-years
ⓘ
about 412 parsecs ⓘ |
| dominantEmissionLine |
doubly ionized oxygen [O III]
ⓘ
hydrogen alpha ⓘ |
| galacticEnvironment |
Orion Arm of the Milky Way
ⓘ
linked to:
Orion Arm
|
| hasApproximateMass | about 2,000 solar masses of gas ⓘ |
| hasSpectralType | H II emission spectrum ⓘ |
| ionizedBy |
Theta1 Orionis C
ⓘ
massive O-type stars ⓘ |
| is |
a nearby laboratory for studying star formation
ⓘ
one of the brightest nebulae in the night sky ⓘ |
| liesIn | Orion's Sword ⓘ |
| liesSouthOf |
Orion's Belt
ⓘ
linked to:
Orion Belt region
|
| locatedInConstellation | Orion ⓘ |
| locatedInGalaxy | Milky Way ⓘ |
| MessierNumber | 42 ⓘ |
| NGCNumber | 1976 ⓘ |
| observedInWavelength |
infrared
ⓘ
optical ⓘ radio ⓘ |
| observedSince | antiquity ⓘ |
| partOf | Orion Molecular Cloud Complex ⓘ |
| rightAscension | 05h 35m ⓘ |
| visibleTo | naked eye ⓘ |
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: M42 Description of subject: M42, also known as the Orion Nebula, is a bright, nearby stellar nursery where new stars are actively forming within the constellation Orion.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.