Swan Nebula
E477766
The Swan Nebula, also known as M17 or the Omega Nebula, is a bright star-forming emission nebula in the constellation Sagittarius, rich in gas, dust, and young massive stars.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Swan Nebula canonical | 5 |
| Horseshoe Nebula | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T4736273 — 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: Swan Nebula Context triple: [Open cluster M17, associatedWith, Swan 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.
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.
Lagoon Nebula
The Lagoon Nebula is a large, bright emission nebula and active star-forming region located in the constellation Sagittarius, visible even to the naked eye under dark skies.
-
D.
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.
-
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: Swan Nebula Target entity description: The Swan Nebula, also known as M17 or the Omega Nebula, is a bright star-forming emission nebula in the constellation Sagittarius, rich in gas, dust, and young massive stars.
-
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.
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.
Lagoon Nebula
The Lagoon Nebula is a large, bright emission nebula and active star-forming region located in the constellation Sagittarius, visible even to the naked eye under dark skies.
-
D.
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.
-
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 |
H II region
ⓘ
astronomical object ⓘ emission nebula ⓘ star-forming region ⓘ |
| alsoKnownAs |
Checkmark Nebula
ⓘ
Horseshoe Nebula ⓘ Lobster Nebula ⓘ M17 ⓘ Messier 17 ⓘ Omega Nebula ⓘ |
| angularSize | about 11 arcminutes by 6 arcminutes ⓘ |
| apparentMagnitudeV | approximately 6.0 ⓘ |
| bestSeenIn |
binoculars
ⓘ
small telescopes ⓘ |
| catalogNumber |
M17
ⓘ
NGC 6618 ⓘ Sharpless 45 ⓘ |
| contains |
interstellar dust
ⓘ
ionized hydrogen gas ⓘ molecular clouds ⓘ young massive stars ⓘ |
| declination | −16° 11′ ⓘ |
| discoveredBy | Philippe Loys de Chéseaux ⓘ |
| discoveryYear | 1745 ⓘ |
| distanceFromEarth |
about 1.6 kiloparsecs
ⓘ
about 5000 light-years ⓘ |
| emits | hydrogen-alpha radiation ⓘ |
| excitedBy | ultraviolet radiation from massive O-type stars ⓘ |
| hasCentralCluster |
open cluster NGC 6618
ⓘ
linked to:
NGC 6618
|
| hasColor | predominantly red in optical images ⓘ |
| hasShape |
omega-shaped appearance
ⓘ
swan-like appearance ⓘ |
| hasSpectralType | H II emission ⓘ |
| includedInCatalog |
Messier catalogue
ⓘ
New General Catalogue ⓘ |
| isRegionOf | active star formation ⓘ |
| isTargetFor |
amateur astronomers
ⓘ
professional astronomical research ⓘ |
| locatedIn |
Milky Way
ⓘ
Sagittarius Arm ⓘ |
| locatedInConstellation | Sagittarius ⓘ |
| locatedNear | Galactic plane ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
| partOf |
Milky Way galaxy
ⓘ
linked to:
Milky Way
|
| regionType | giant molecular cloud complex ⓘ |
| rightAscension | 18h 20m ⓘ |
| visibleFrom | Earth ⓘ |
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: Swan Nebula Description of subject: The Swan Nebula, also known as M17 or the Omega Nebula, is a bright star-forming emission nebula in the constellation Sagittarius, rich in gas, dust, and young massive stars.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Swan Nebula
linked to: Swan Nebula
linked to: Swan Nebula