NGC 6809

E525476

NGC 6809 is a bright, relatively nearby globular star cluster in the constellation Sagittarius, notable for its loose structure and rich population of ancient stars.

All labels observed (1)

Label Occurrences
NGC 6809 canonical 3

How this entity was disambiguated

Statements (46)

Predicate Object
instanceOf globular star cluster ⓘ
absoluteMagnitudeV about −7.6 ⓘ
age about 12.5 billion years ⓘ
alsoKnownAs M55 ⓘ
Messier 55 ⓘ
angularSize 19 arcminutes ⓘ
apparentMagnitudeV 6.3 ⓘ
belongsTo Local Group ⓘ
bestSeenFrom Southern Hemisphere ⓘ
bestViewingSeason northern summer ⓘ
catalog New General Catalogue ⓘ
contains RR Lyrae variable stars ⓘ
blue horizontal branch stars ⓘ
red giant branch stars ⓘ
coreConcentration low ⓘ
declination −30° 58′ ⓘ
discoveredBy Nicolas-Louis de Lacaille ⓘ
linked to: Nicolas de Lacaille
discoveryYear 1752 ⓘ
distanceFromEarth about 17,600 light-years ⓘ
about 5.4 kiloparsecs ⓘ
galacticLatitude −23.3 degrees ⓘ
galacticLongitude 9.0 degrees ⓘ
galacticSystem Sagittarius region of the Milky Way ⓘ
halfLightRadius about 9 parsecs ⓘ
hasColorIndexBminusV about 0.78 ⓘ
horizontalBranchMorphology blue ⓘ
includedInCatalogue Messier catalogue ⓘ
locatedIn Milky Way ⓘ
Milky Way halo ⓘ
locatedInConstellation Sagittarius ⓘ
messierCatalogueNumber 55 ⓘ
messierNumber M55 ⓘ
metallicityFeH about −1.9 ⓘ
notableFor loose structure ⓘ
rich population of ancient stars ⓘ
observationalType non-core-collapsed globular cluster ⓘ
observedFrom Cape of Good Hope ⓘ
orbitalComponent outer halo of the Milky Way ⓘ
rightAscension 19h 40m ⓘ
spectralTypeDominant G and K giants ⓘ
stellarPopulation Population II stars ⓘ
old stars ⓘ
structuralConcentrationClass XI ⓘ
structure loose ⓘ
surfaceBrightness low ⓘ
visibility visible in binoculars under dark skies ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Messier 55 → otherName → NGC 6809 ⓘ
GCl 111 → alsoKnownAs → NGC 6809 ⓘ
GCl 111 → catalogNumber → NGC 6809 ⓘ