Messier 57
E457105
Messier 57, also known as the Ring Nebula, is a famous planetary nebula in the constellation Lyra formed from the expelled outer layers of a dying star.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 57 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4648495 — 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: Messier 57 Context triple: [Messier catalogue, contains, Messier 57]
-
A.
Messier 69
Messier 69 is a dense, metal-rich globular star cluster located in the constellation Sagittarius near the center of the Milky Way.
-
B.
Messier 21
Messier 21 is a young open star cluster in the constellation Sagittarius, notable for its bright, densely packed hot stars and proximity to the Trifid Nebula.
-
C.
Messier 75
Messier 75 is a densely concentrated globular star cluster located in the constellation Sagittarius, notable for its great distance from Earth and rich population of ancient stars.
-
D.
Messier 28
Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
-
E.
Messier 70
Messier 70 is a dense globular star cluster located in the constellation Sagittarius near the center of the Milky Way galaxy.
- 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: Messier 57 Target entity description: Messier 57, also known as the Ring Nebula, is a famous planetary nebula in the constellation Lyra formed from the expelled outer layers of a dying star.
-
A.
Messier 69
Messier 69 is a dense, metal-rich globular star cluster located in the constellation Sagittarius near the center of the Milky Way.
-
B.
Messier 21
Messier 21 is a young open star cluster in the constellation Sagittarius, notable for its bright, densely packed hot stars and proximity to the Trifid Nebula.
-
C.
Messier 75
Messier 75 is a densely concentrated globular star cluster located in the constellation Sagittarius, notable for its great distance from Earth and rich population of ancient stars.
-
D.
Messier 28
Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
-
E.
Messier 70
Messier 70 is a dense globular star cluster located in the constellation Sagittarius near the center of the Milky Way galaxy.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
deep-sky object ⓘ emission nebula ⓘ planetary nebula ⓘ |
| alsoKnownAs |
M57
NERFINISHED
ⓘ
NGC 6720 NERFINISHED ⓘ Ring Nebula NERFINISHED ⓘ |
| angularSize | about 1.4 × 1.0 arcminutes ⓘ |
| apparentMagnitudeV | 8.8 ⓘ |
| bestSeenIn |
medium telescopes
ⓘ
small telescopes ⓘ |
| catalogNumber |
M57
NERFINISHED
ⓘ
NGC 6720 NERFINISHED ⓘ |
| centralStar | white dwarf ⓘ |
| centralStarApparentMagnitude | about 15.8 ⓘ |
| centralStarEffectiveTemperature | about 120,000 K ⓘ |
| declination | +33° 01′ 45″ ⓘ |
| discoveredBy |
Antoine Darquier de Pellepoix
NERFINISHED
ⓘ
Charles Messier NERFINISHED ⓘ |
| discoveryYear | 1779 ⓘ |
| distanceFromEarth |
about 2,300 light-years
ⓘ
about 700 parsecs ⓘ |
| dominantEmissionLine | [O III] ⓘ |
| dominantEmissionLineWavelength | 500.7 nm ⓘ |
| estimatedAge | about 7,000 years ⓘ |
| galacticLatitude | 13.99° ⓘ |
| galacticLongitude | 63.17° ⓘ |
| hasFeature |
bright inner ring
ⓘ
fainter outer halo ⓘ filamentary structures ⓘ |
| locatedIn |
Galactic halo region near the plane
ⓘ
Milky Way ⓘ |
| locatedInConstellation | Lyra NERFINISHED ⓘ |
| morphology | elliptical planetary nebula ⓘ |
| nearTo |
bright star Vega
NERFINISHED
ⓘ
constellation Cygnus border ⓘ |
| nebulaExpansionVelocity | about 20–30 km/s ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ ultraviolet wavelengths ⓘ |
| origin | expelled outer layers of a dying star ⓘ |
| partOf |
Messier catalogue
NERFINISHED
ⓘ
New General Catalogue NERFINISHED ⓘ |
| progenitorStarMass | about 1.2 solar masses ⓘ |
| rightAscension | 18h 53m 35s ⓘ |
| shape | ring-like ⓘ |
| spectralType | emission-line nebula ⓘ |
| visibleFrom | Northern Hemisphere NERFINISHED ⓘ |
| visibleSeason | northern summer ⓘ |
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: Messier 57 Description of subject: Messier 57, also known as the Ring Nebula, is a famous planetary nebula in the constellation Lyra formed from the expelled outer layers of a dying star.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.