GCl 111
E491712
GCl 111 is a globular star cluster in the constellation Sagittarius, better known as Messier 55 in the Messier catalog of deep-sky objects.
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf | globular star cluster ⓘ |
| age | about 12.5 billion years ⓘ |
| alsoKnownAs |
M55
NERFINISHED
ⓘ
Messier 55 NERFINISHED ⓘ NGC 6809 NERFINISHED ⓘ |
| angularSize | 19 arcminutes ⓘ |
| apparentMagnitudeV | 6.3 ⓘ |
| belongsTo | Local Group NERFINISHED ⓘ |
| bestViewingMonth | July ⓘ |
| bestViewingSeason |
northern summer
ⓘ
southern winter ⓘ |
| catalog |
GCl catalogue
ⓘ
Messier catalogue NERFINISHED ⓘ New General Catalogue NERFINISHED ⓘ |
| catalogNumber |
GCl 111
ⓘ
M55 ⓘ NGC 6809 NERFINISHED ⓘ |
| constellation | Sagittarius NERFINISHED ⓘ |
| contains |
RR Lyrae variable stars
ⓘ
old, metal-poor stars ⓘ |
| coreAppearance | loose, not strongly concentrated ⓘ |
| coreConcentration | low ⓘ |
| declination | −30° 58′ ⓘ |
| discoveredBy | Nicolas-Louis de Lacaille NERFINISHED ⓘ |
| discoveryYear | 1752 ⓘ |
| distanceFromEarth |
about 17,600 light-years
ⓘ
about 5.4 kiloparsecs ⓘ |
| galacticComponent | galactic halo ⓘ |
| galacticLatitude | about −23° ⓘ |
| galacticLongitude | about 9° ⓘ |
| hasMessierNumber | 55 ⓘ |
| hasNGCNumber | 6809 ⓘ |
| hemisphereVisibility | best seen from southern hemisphere ⓘ |
| hostGalaxy | Milky Way NERFINISHED ⓘ |
| locatedIn | Milky Way ⓘ |
| locatedNear | galactic center direction ⓘ |
| metallicity | low ⓘ |
| metallicityFeH | about −1.9 ⓘ |
| observationalAppearance | large, diffuse globular cluster ⓘ |
| observedFrom | Cape of Good Hope NERFINISHED ⓘ |
| OosterhoffType | Oosterhoff type II NERFINISHED ⓘ |
| rightAscension | 19h 40m ⓘ |
| surfaceBrightness | low ⓘ |
| type | Class XI globular cluster (Shapley–Sawyer) ⓘ |
| visibility | visible in binoculars under dark skies ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.