redSupergiant Stephenson 2-18
E459136
Stephenson 2-18 is an extremely luminous red supergiant star, considered one of the largest known stars in the Milky Way.
All labels observed (1)
| Label | Occurrences |
|---|---|
| redSupergiant Stephenson 2-18 canonical | 1 |
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
cool supergiant
ⓘ
luminous supergiant ⓘ red supergiant star ⓘ star ⓘ |
| discoveredBy | Charles Bruce Stephenson NERFINISHED ⓘ |
| discoveryMethod | infrared survey ⓘ |
| hasAlternativeName |
RSGC2-18
NERFINISHED
ⓘ
St2-18 NERFINISHED ⓘ Stephenson 2 DFK 49 NERFINISHED ⓘ |
| hasApparentMagnitude | very faint in visible light ⓘ |
| hasApproximateDistanceFromEarth |
about 19,000 light-years
ⓘ
about 6 kiloparsecs ⓘ |
| hasApproximateLuminosity | hundreds of thousands of times the luminosity of the Sun ⓘ |
| hasApproximateRadius |
over 2000 times the radius of the Sun
ⓘ
over 9 astronomical units ⓘ |
| hasColor | red ⓘ |
| hasEffectiveTemperature | approximately 3200 K ⓘ |
| hasEstimatedInitialMass | tens of solar masses ⓘ |
| hasEvolutionaryStage | late stage massive star ⓘ |
| hasExtendedStellarAtmosphere | true ⓘ |
| hasGalacticEnvironment | highly reddened region ⓘ |
| hasGalacticLocation | inner Milky Way disk ⓘ |
| hasHighInfraredBrightness | true ⓘ |
| hasHighMassLossRate | true ⓘ |
| hasLuminosityClass | Ia ⓘ |
| hasOuterLayers | cool extended envelope ⓘ |
| hasResearchInterest |
late stages of massive stars
ⓘ
mass loss in red supergiants ⓘ massive star evolution ⓘ |
| hasSpectralClass | M6 ⓘ |
| hasSpectralType | M-type ⓘ |
| hasStellarPopulation | Population I ⓘ |
| hasStellarWind | dense slow stellar wind ⓘ |
| hasVariability | suspected semiregular variability ⓘ |
| isAmong |
largest known stars
ⓘ
most luminous red supergiants ⓘ |
| isEmbeddedIn | rich red supergiant cluster Stephenson 2 NERFINISHED ⓘ |
| isObscuredBy | interstellar dust ⓘ |
| isUsedAs |
example of extreme red supergiant
ⓘ
example of extreme stellar radius ⓘ |
| locatedIn |
Milky Way
ⓘ
constellation Scutum NERFINISHED ⓘ |
| memberOf | open cluster Stephenson 2 NERFINISHED ⓘ |
| willEndAs | core-collapse supernova ⓘ |
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: redSupergiant Stephenson 2-18 Description of subject: Stephenson 2-18 is an extremely luminous red supergiant star, considered one of the largest known stars in the Milky Way.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.