Sh 2-276
E558699
Sh 2-276 is a large, faint emission nebula in the constellation Orion, commonly known as Barnard's Loop, forming part of the Orion molecular cloud complex.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Sh 2-276 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5969853 — 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: Sh 2-276 Context triple: [Barnard's Loop, catalogCode, Sh 2-276]
-
A.
Sh 2-275
Sh 2-275 is a large, circular emission nebula in the constellation Monoceros, notable for its active star-forming region and striking rosette-like appearance.
-
B.
Sh 2-25
Sh 2-25 is an emission nebula in the constellation Sagittarius, better known as part of the bright star-forming region Messier 8 (the Lagoon Nebula).
-
C.
SH 21-76
SH 21-76 is the U.S. Army’s Ranger Handbook, a field manual that outlines the doctrine, tactics, techniques, and procedures for Army Rangers.
-
D.
SH 12
SH 12 is a designation for Texas State Highway 12, a state-maintained roadway within the Texas highway system.
-
E.
SH 78
SH 78 is a state highway in Colorado that runs through the south-central part of the state, connecting rural communities and scenic mountainous areas.
- 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: Sh 2-276 Target entity description: Sh 2-276 is a large, faint emission nebula in the constellation Orion, commonly known as Barnard's Loop, forming part of the Orion molecular cloud complex.
-
A.
Sh 2-275
Sh 2-275 is a large, circular emission nebula in the constellation Monoceros, notable for its active star-forming region and striking rosette-like appearance.
-
B.
Sh 2-25
Sh 2-25 is an emission nebula in the constellation Sagittarius, better known as part of the bright star-forming region Messier 8 (the Lagoon Nebula).
-
C.
SH 21-76
SH 21-76 is the U.S. Army’s Ranger Handbook, a field manual that outlines the doctrine, tactics, techniques, and procedures for Army Rangers.
-
D.
SH 12
SH 12 is a designation for Texas State Highway 12, a state-maintained roadway within the Texas highway system.
-
E.
SH 78
SH 78 is a state highway in Colorado that runs through the south-central part of the state, connecting rural communities and scenic mountainous areas.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
emission nebula ⓘ interstellar nebula ⓘ |
| alsoKnownAs |
Barnard's Loop
ⓘ
Sharpless 2-276 ⓘ |
| angularPositionRelativeTo | surrounds Orion Nebula region ⓘ |
| apparentSize | about 10 degrees across ⓘ |
| associatedWith |
Orion OB1 association
ⓘ
linked to:
Orion OB association
massive star formation in Orion ⓘ |
| bestSeenFrom | dark-sky sites with wide-field imaging ⓘ |
| catalog |
Barnard dark and bright nebulae lists (as Barnard's Loop)
ⓘ
Sharpless catalog of H II regions ⓘ
linked to:
Sharpless catalogue
|
| contains |
filamentary emission structures
ⓘ
regions of enhanced H-alpha brightness ⓘ |
| discoveredBy | Edward Emerson Barnard ⓘ |
| distanceFromEarth |
about 1600 light-years
ⓘ
about 500 parsecs ⓘ |
| dominantEmissionLine | H-alpha ⓘ |
| emissionMechanism | recombination radiation from ionized hydrogen ⓘ |
| environment | surrounds Orion A and Orion B molecular clouds ⓘ |
| excitationSource | ultraviolet radiation from young massive stars ⓘ |
| galacticLocation |
Orion Arm of the Milky Way
ⓘ
linked to:
Orion Arm
|
| gasComposition | ionized hydrogen-dominated gas ⓘ |
| ionizedBy | massive stars in Orion OB1 association ⓘ |
| likelyOrigin | past supernova explosions and stellar winds in Orion OB1 ⓘ |
| locatedInConstellation | Orion ⓘ |
| observationalChallenge | low surface brightness ⓘ |
| observedInWavelength |
infrared
ⓘ
optical ⓘ radio ⓘ |
| orientation | curves from north of Orion’s Belt around to south of Orion’s Sword ⓘ |
| partOf |
Orion molecular cloud complex
ⓘ
linked to:
Orion Molecular Cloud Complex
Orion-Eridanus superbubble ⓘ
linked to:
Loop I superbubble
|
| photographicAppearance | large red arc around Orion ⓘ |
| physicalNature | ionized shell surrounding hot, low-density cavity ⓘ |
| regionOfSky | Orion constellation region near Belt and Sword ⓘ |
| relatedTo |
Flame Nebula
ⓘ
Horsehead Nebula ⓘ Orion Nebula (M42) ⓘ
linked to:
Orion Nebula
Running Man Nebula ⓘ |
| requiresForImaging | long-exposure wide-field astrophotography ⓘ |
| shape | large arc ⓘ |
| skyLocation | encircles much of the Orion constellation’s central region ⓘ |
| structureType | expanding shell or bubble ⓘ |
| visibility | faint ⓘ |
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: Sh 2-276 Description of subject: Sh 2-276 is a large, faint emission nebula in the constellation Orion, commonly known as Barnard's Loop, forming part of the Orion molecular cloud complex.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.