NGC 604
E116797
NGC 604 is a vast, luminous star-forming nebula in the Triangulum Galaxy, notable as one of the largest known H II regions in the Local Group.
All labels observed (3)
| Label | Occurrences |
|---|---|
| NGC 604 canonical | 4 |
| M33 H II region NGC 604 | 1 |
| giant H II region NGC 604 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T934052 — 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: NGC 604 Context triple: [Triangulum Galaxy, hasHIIRegion, NGC 604]
-
A.
NGC 6822
NGC 6822 is a barred irregular dwarf galaxy located in the constellation Sagittarius and is one of the nearest and best-studied galaxies outside the Milky Way.
-
B.
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.
-
C.
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.
-
D.
NGC 205
NGC 205 is a dwarf elliptical satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Local Group’s largest spiral and its mixed old and young stellar populations.
-
E.
Messier 17
Messier 17, also known as the Omega or Swan Nebula, is a bright star-forming emission nebula located in the constellation Sagittarius.
- 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: NGC 604 Target entity description: NGC 604 is a vast, luminous star-forming nebula in the Triangulum Galaxy, notable as one of the largest known H II regions in the Local Group.
-
A.
NGC 6822
NGC 6822 is a barred irregular dwarf galaxy located in the constellation Sagittarius and is one of the nearest and best-studied galaxies outside the Milky Way.
-
B.
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.
-
C.
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.
-
D.
NGC 205
NGC 205 is a dwarf elliptical satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Local Group’s largest spiral and its mixed old and young stellar populations.
-
E.
Messier 17
Messier 17, also known as the Omega or Swan Nebula, is a bright star-forming emission nebula located in the constellation Sagittarius.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
emission nebula ⓘ giant H II region ⓘ star-forming region ⓘ |
| alternativeName |
Hubble V
ⓘ
M33 H II region NGC 604 ⓘ
linked to:
NGC 604
|
| angularSize | about 1.5 arcminutes ⓘ |
| apparentMagnitude | approximately 11.9 ⓘ |
| catalog | New General Catalogue ⓘ |
| catalogNumber | NGC 604 ⓘ |
| celestialObjectType | nebula ⓘ |
| composition |
helium
ⓘ
interstellar dust ⓘ ionized hydrogen gas ⓘ |
| constellation | Triangulum ⓘ |
| contains |
O-type stars
ⓘ
Wolf–Rayet stars ⓘ young massive star cluster ⓘ |
| declination | +30° 47′ 06″ ⓘ |
| diameter | approximately 1500 light-years ⓘ |
| discoveredBy | William Herschel ⓘ |
| discoveryDate | 1784 ⓘ |
| distanceFromEarth |
approximately 0.83 megaparsecs
ⓘ
approximately 2.7 million light-years ⓘ |
| dominantEmissionLine | H-alpha ⓘ |
| environment | spiral arm of the Triangulum Galaxy ⓘ |
| galaxyTypeOfHost | spiral galaxy ⓘ |
| hostGalaxy | M33 star-forming disk ⓘ |
| ionizingSource | massive young stars ⓘ |
| locatedIn |
Messier 33
ⓘ
linked to:
Triangulum Galaxy
Triangulum Galaxy ⓘ |
| memberOf | Local Group ⓘ |
| morphology | complex filamentary and bubble structures ⓘ |
| notableProperty |
among the most luminous H II regions in the Local Group
ⓘ
comparable in nature to 30 Doradus in the Large Magellanic Cloud ⓘ |
| observedBy |
Chandra X-ray Observatory
ⓘ
Hubble Space Telescope ⓘ Spitzer Space Telescope ⓘ Very Large Telescope ⓘ |
| physicalProcess |
massive star formation
ⓘ
photoionization of gas ⓘ stellar winds ⓘ supernova feedback ⓘ |
| researchUse |
laboratory for studying feedback in star-forming regions
ⓘ
laboratory for studying massive star formation ⓘ |
| rightAscension | 01h 34m 33s ⓘ |
| sizeRank | one of the largest known H II regions in the Local Group ⓘ |
| spectralCharacteristic | strong hydrogen emission lines ⓘ |
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: NGC 604 Description of subject: NGC 604 is a vast, luminous star-forming nebula in the Triangulum Galaxy, notable as one of the largest known H II regions in the Local Group.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.