C 74
E293602
C 74 is the Caldwell catalog designation for the Southern Ring Nebula, a bright planetary nebula in the constellation Vela.
All labels observed (1)
| Label | Occurrences |
|---|---|
| C 74 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2721301 — 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: C 74 Context triple: [Southern Ring Nebula, catalogNumber, C 74]
-
A.
C-7
C-7 is a commuter rail line in the Cercanías Madrid network that connects central Madrid with various suburban areas.
-
B.
C-9
C-9 is a mountain railway line of Madrid’s Cercanías commuter rail network that connects the city with the Sierra de Guadarrama, including the Puerto de Navacerrada and Cotos areas.
-
C.
C-2
C-2 is a commuter rail line within the Cercanías Madrid network that connects central Madrid with its surrounding metropolitan areas.
-
D.
C-8
C-8 is a commuter rail line within the Cercanías Madrid network that connects central Madrid with various suburban areas.
-
E.
C-10
C-10 is a commuter rail line within the Cercanías Madrid network that connects central Madrid with its surrounding metropolitan 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: C 74 Target entity description: C 74 is the Caldwell catalog designation for the Southern Ring Nebula, a bright planetary nebula in the constellation Vela.
-
A.
C-7
C-7 is a commuter rail line in the Cercanías Madrid network that connects central Madrid with various suburban areas.
-
B.
C-9
C-9 is a mountain railway line of Madrid’s Cercanías commuter rail network that connects the city with the Sierra de Guadarrama, including the Puerto de Navacerrada and Cotos areas.
-
C.
C-2
C-2 is a commuter rail line within the Cercanías Madrid network that connects central Madrid with its surrounding metropolitan areas.
-
D.
C-8
C-8 is a commuter rail line within the Cercanías Madrid network that connects central Madrid with various suburban areas.
-
E.
C-10
C-10 is a commuter rail line within the Cercanías Madrid network that connects central Madrid with its surrounding metropolitan areas.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
Caldwell object
ⓘ
deep-sky object ⓘ planetary nebula ⓘ |
| angularSize | ~44 arcseconds ⓘ |
| apparentMagnitudeV | ~9.0 ⓘ |
| bestSeenInSeason |
autumn (Southern Hemisphere)
ⓘ
late southern summer ⓘ |
| catalog | Caldwell catalogue ⓘ |
| centralStarType | hot central star ⓘ |
| declination | -40° 25′ ⓘ |
| discoveredBy | John Herschel ⓘ |
| discoveryYear | 1835 ⓘ |
| distanceFromEarth |
~2000 light-years
ⓘ
~600 parsecs ⓘ |
| emissionLine |
H-alpha
ⓘ
[O III] ⓘ |
| evolutionaryStage | late stage of low- to intermediate-mass star ⓘ |
| hasAlternativeName |
ESO 378-1
ⓘ
PN G283.8-04.2 ⓘ Southern Ring Nebula ⓘ |
| hasCentralStar | white dwarf ⓘ |
| hasColor | bluish-green ⓘ |
| hasDesignation | Caldwell 74 ⓘ |
| hasGalacticLatitude | ~ -4.2° ⓘ |
| hasGalacticLongitude | ~ 283.8° ⓘ |
| hasMorphology |
elliptical shell
ⓘ
ring-like structure ⓘ |
| hasNebularGas | ionized gas shell ⓘ |
| hasNickname | Southern Ring ⓘ |
| hasObservationRequirement |
dark skies preferred
ⓘ
moderate magnification ⓘ |
| hasShape | nearly circular ring ⓘ |
| hasSurfaceBrightness | high ⓘ |
| isIncludedIn | planetary nebula catalogues ⓘ |
| isSimilarTo | M57 ⓘ |
| isTargetFor |
amateur astronomers
ⓘ
astrophotographers ⓘ |
| isVisibleFrom | Southern Hemisphere ⓘ |
| locatedIn |
Galactic disk
ⓘ
Milky Way ⓘ |
| locatedInConstellation | Vela ⓘ |
| observedWith |
medium telescope
ⓘ
small telescope ⓘ |
| rightAscension | 10h 52m ⓘ |
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: C 74 Description of subject: C 74 is the Caldwell catalog designation for the Southern Ring Nebula, a bright planetary nebula in the constellation Vela.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.