openCluster Stephenson 2
E459137
Stephenson 2 is a massive, heavily reddened open star cluster rich in red supergiants, located in the direction of the constellation Scutum.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Stephenson 2 | 0 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
open star cluster ⓘ stellar cluster ⓘ |
| belongsTo | Galactic disk ⓘ |
| discoveredBy | Charles Bruce Stephenson NERFINISHED ⓘ |
| hasAge | about 17 million years ⓘ |
| hasAgeRange | 10–20 million years ⓘ |
| hasAlternativeName |
RSGC2
NERFINISHED
ⓘ
Red Supergiant Cluster 2 NERFINISHED ⓘ |
| hasApparentMagnitude | about 14 (V band, integrated; heavily reddened) ⓘ |
| hasClusterRadius | a few parsecs ⓘ |
| hasClusterType | young massive open cluster ⓘ |
| hasCoreRadius | about 1 parsec (order of magnitude) ⓘ |
| hasDeclination | −06° (approximate, J2000) ⓘ |
| hasDiscoveryMethod | infrared survey identification ⓘ |
| hasDistanceFromEarth |
about 19,500 light-years
ⓘ
about 6 kiloparsecs ⓘ |
| hasDominantStellarType |
B-type main-sequence progenitors (earlier evolutionary stage)
ⓘ
red supergiant stars ⓘ |
| hasEstimatedInitialMassOfRedSupergiants | about 10–20 solar masses ⓘ |
| hasEstimatedMass | several 10^4 solar masses ⓘ |
| hasGalacticLatitude | about 0 degrees ⓘ |
| hasGalacticLongitude | about 26 degrees ⓘ |
| hasHighInterstellarExtinction | true ⓘ |
| hasMetallicity | approximately solar or slightly supersolar (inner Galaxy environment) ⓘ |
| hasNumberOfRedSupergiants |
more than 20
ⓘ
one of the largest known concentrations of red supergiants in the Milky Way ⓘ |
| hasRedSupergiantSpectralTypes | K–M supergiants ⓘ |
| hasRightAscension | 18h 39m (approximate, J2000) ⓘ |
| hasScientificInterest | benchmark for red supergiant cluster population in the Milky Way ⓘ |
| hasSpectralStudiesIn | near-infrared spectroscopy ⓘ |
| hasStellarPopulationType | young massive stars ⓘ |
| isBestObservedIn | infrared wavelengths ⓘ |
| isDifficultToObserveInVisible | true ⓘ |
| isHeavilyReddened | true ⓘ |
| isMassiveCluster | true ⓘ |
| isPartOf | group of red supergiant clusters near Scutum ⓘ |
| isRichIn | red supergiants ⓘ |
| isSimilarTo |
RSGC1
NERFINISHED
ⓘ
RSGC3 NERFINISHED ⓘ |
| isUsedToStudy |
late stages of massive star evolution
ⓘ
massive cluster formation in the inner Milky Way ⓘ red supergiant properties ⓘ |
| liesIn |
Milky Way galaxy
NERFINISHED
ⓘ
Scutum–Crux arm region NERFINISHED ⓘ inner Galaxy ⓘ |
| locatedInConstellation | Scutum NERFINISHED ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.