Caldwell 74
E293601
Caldwell 74 is a bright, well-known planetary nebula in the constellation Vela, popularly called the Southern Ring Nebula.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Caldwell 74 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2721299 — 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: Caldwell 74 Context triple: [Southern Ring Nebula, otherName, Caldwell 74]
-
A.
Barnard
Barnard is a surname and given name of English and French origin, borne by various notable individuals and institutions.
-
B.
Ursa Minor Beta
Ursa Minor Beta is a fictional planet in Douglas Adams' "The Hitchhiker's Guide to the Galaxy" series, best known as the corporate home of the Guide itself.
-
C.
Sandage
Sandage is a surname most notably associated with Allan R. Sandage, a prominent American astronomer known for his work on the expansion rate and age of the universe.
-
D.
Alpha Capricorni
Alpha Capricorni is a bright multiple star system in the constellation Capricornus, visible to the naked eye as a single star but actually composed of two widely separated components.
-
E.
Delta Capricorni
Delta Capricorni is a multiple star system in the constellation Capricornus, notable as its most luminous star and commonly known by the traditional name Deneb Algedi.
- 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: Caldwell 74 Target entity description: Caldwell 74 is a bright, well-known planetary nebula in the constellation Vela, popularly called the Southern Ring Nebula.
-
A.
Barnard
Barnard is a surname and given name of English and French origin, borne by various notable individuals and institutions.
-
B.
Ursa Minor Beta
Ursa Minor Beta is a fictional planet in Douglas Adams' "The Hitchhiker's Guide to the Galaxy" series, best known as the corporate home of the Guide itself.
-
C.
Sandage
Sandage is a surname most notably associated with Allan R. Sandage, a prominent American astronomer known for his work on the expansion rate and age of the universe.
-
D.
Alpha Capricorni
Alpha Capricorni is a bright multiple star system in the constellation Capricornus, visible to the naked eye as a single star but actually composed of two widely separated components.
-
E.
Delta Capricorni
Delta Capricorni is a multiple star system in the constellation Capricornus, notable as its most luminous star and commonly known by the traditional name Deneb Algedi.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
deep-sky object
ⓘ
emission nebula ⓘ planetary nebula ⓘ |
| angularSize | about 1.7 arcminutes ⓘ |
| apparentMagnitudeV | 8.2 ⓘ |
| bestObservedIn |
medium telescopes
ⓘ
small telescopes ⓘ |
| bestSeenFrom | Southern Hemisphere ⓘ |
| catalogCode |
C74
ⓘ
NGC 3132 ⓘ PK 272-3.1 ⓘ |
| centralStarType | post-asymptotic giant branch star remnant ⓘ |
| declination | −40° 26′ 11″ ⓘ |
| discoveredBy | John Herschel ⓘ |
| discoveryYear | 1835 ⓘ |
| distanceFromEarth |
about 2000 light-years
ⓘ
about 620 parsecs ⓘ |
| evolutionaryStage | late stage of low- to intermediate-mass star ⓘ |
| hasAlternativeName |
Eight-Burst Nebula
ⓘ
NGC 3132 ⓘ PK 272-3.1 ⓘ Southern Ring Nebula ⓘ |
| hasApparentBrightness | bright for a planetary nebula ⓘ |
| hasCentralStar |
hot central star of planetary nebula
ⓘ
white dwarf ⓘ |
| hasColor |
blue-green inner region
ⓘ
reddish outer regions ⓘ |
| hasCommonName |
Eight-Burst Nebula
ⓘ
Southern Ring Nebula ⓘ |
| hasIonizedGas |
hydrogen
ⓘ
nitrogen ⓘ oxygen ⓘ |
| hasMorphology |
elliptical planetary nebula
ⓘ
ring-like structure ⓘ |
| hasShape | slightly elongated ring ⓘ |
| isPartOf | Caldwell catalogue ⓘ |
| isPopularTargetFor |
amateur astronomers
ⓘ
astrophotography ⓘ |
| locatedIn |
Galactic disk
ⓘ
Milky Way ⓘ |
| locatedInConstellation | Vela ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ ultraviolet wavelengths ⓘ |
| rightAscension | 10h 07m 01s ⓘ |
| spectralFeatures |
H-alpha emission
ⓘ
strong [O III] emission lines ⓘ |
| visibleInSeason | late summer in 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: Caldwell 74 Description of subject: Caldwell 74 is a bright, well-known planetary nebula in the constellation Vela, popularly called the Southern Ring Nebula.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.