GCl 117

E507132

GCl 117 is a dense globular star cluster in the constellation Sagittarius, better known as Messier 75 in the Messier catalog.

All labels observed (1)

Label Occurrences
GCl 117 canonical 1

How this entity was disambiguated

Statements (39)

Predicate Object
instanceOf globular star cluster
absoluteMagnitudeV about −8.5
addedToMessierCatalogueBy Charles Messier
age ~13 billion years
angularSize 6.8 arcminutes
apparentMagnitudeV 8.6
belongsToGalaxy Milky Way
bestViewingHemisphere Southern Hemisphere
low southern skies from Northern Hemisphere
bestViewingSeason summer
catalogCode GCl 117
concentrationClass I
contains old, metal-poor stars
declination −21° 55′ 17″
discoveredBy Pierre Méchain
discoveryYear 1780
distanceFromEarth ~20.7 kiloparsecs
~67,500 light-years
distanceFromGalacticCenter ~14.7 kiloparsecs
galacticLatitude −25.75°
galacticLongitude 12.19°
hasAlternativeName M75
Messier 75
NGC 6864
hasColorIndexBminusV about 0.76
hasMorphology highly concentrated core
isCoreCollapsed true
isPartOf Messier catalogue
New General Catalogue
locatedIn Milky Way halo
locatedInConstellation Sagittarius
messierNumber 75
metallicityFeH about −1.3
ngcNumber 6864
notes one of the most centrally concentrated globular clusters known
radialVelocity ~−186 km/s
rightAscension 20h 06m 04s
shapleySawyerClass I
visibility best seen with medium to large amateur telescopes

How these facts were elicited

Referenced by (1)

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

Messier 75 otherName GCl 117