Omega Nebula
E117836
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.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Omega Nebula canonical | 6 |
| Lobster Nebula | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T869223 — 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: Omega Nebula Context triple: [Sagittarius, contains, Omega Nebula]
-
A.
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.
-
B.
Eagle Nebula
The Eagle Nebula is a famous star-forming region in the Milky Way best known for the "Pillars of Creation," towering columns of gas and dust captured in iconic Hubble Space Telescope images.
-
C.
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.
-
D.
Orion Nebula
The Orion Nebula is a bright, nearby stellar nursery where new stars and planetary systems are actively forming within the constellation Orion.
-
E.
Southern Ring Nebula
The Southern Ring Nebula is a bright, roughly 2,000-light-year-distant planetary nebula in the constellation Vela, formed from the outer layers of a dying sun-like star and notable for its intricate, colorful gas shells.
- 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: Omega Nebula Target entity description: 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.
-
A.
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.
-
B.
Eagle Nebula
The Eagle Nebula is a famous star-forming region in the Milky Way best known for the "Pillars of Creation," towering columns of gas and dust captured in iconic Hubble Space Telescope images.
-
C.
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.
-
D.
Orion Nebula
The Orion Nebula is a bright, nearby stellar nursery where new stars and planetary systems are actively forming within the constellation Orion.
-
E.
Southern Ring Nebula
The Southern Ring Nebula is a bright, roughly 2,000-light-year-distant planetary nebula in the constellation Vela, formed from the outer layers of a dying sun-like star and notable for its intricate, colorful gas shells.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
deep-sky object ⓘ emission nebula ⓘ star-forming region ⓘ |
| addedToMessierCatalogBy | Charles Messier ⓘ |
| alsoKnownAs |
Checkmark Nebula
ⓘ
Swan Nebula ⓘ
surface form:
Horseshoe Nebula
Omega Nebula ⓘ
surface form:
Lobster Nebula
M17 ⓘ Messier 17 ⓘ Swan Nebula ⓘ |
| angularSize | 11 arcminutes × 6 arcminutes ⓘ |
| apparentMagnitudeV | 6.0 ⓘ |
| bestSeenIn |
Sagittarius region of the Milky Way
ⓘ
summer ⓘ |
| catalogNumber |
Messier 17
ⓘ
NGC 6618 ⓘ Sharpless 45 ⓘ |
| contains |
B-type stars
ⓘ
dark dust lanes ⓘ ionized hydrogen gas ⓘ massive O-type stars ⓘ molecular clouds ⓘ young star cluster ⓘ |
| declination | −16° 11′ ⓘ |
| discoveredBy | Philippe Loys de Chéseaux ⓘ |
| discoveryYear | 1745–1746 ⓘ |
| distanceFromEarth | about 5,000–6,000 light-years ⓘ |
| distanceFromEarthParsecs | about 1,600–1,800 parsecs ⓘ |
| dominantEmissionLine |
H-alpha
ⓘ
[O III] ⓘ |
| hasColor |
pink
ⓘ
reddish ⓘ |
| hasEstimatedMassOfGas | several thousand solar masses ⓘ |
| hasShape |
omega-shaped
ⓘ
swan-like ⓘ |
| hasStarFormationActivity | ongoing ⓘ |
| is | one of the brightest star-forming regions in the Milky Way visible from Earth ⓘ |
| isPopularTargetFor |
amateur astronomers
ⓘ
astrophotographers ⓘ |
| locatedIn |
Milky Way
ⓘ
Sagittarius Arm ⓘ
surface form:
Sagittarius Arm of the Milky Way
|
| locatedInConstellation | Sagittarius ⓘ |
| messierCatalogEntryYear | 1764 ⓘ |
| observedInWavelength |
infrared
ⓘ
optical ⓘ radio ⓘ |
| partOf |
Sagittarius Arm
ⓘ
surface form:
Sagittarius-Carina spiral arm
|
| rightAscension | 18h 20m ⓘ |
| spectralType | H II region ⓘ |
| visibleFromHemisphere |
Northern Hemisphere
ⓘ
Southern Hemisphere ⓘ |
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: Omega Nebula Description of subject: 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.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Lobster Nebula