Great Hercules Cluster
E267995
The Great Hercules Cluster is a bright, densely packed globular star cluster in the constellation Hercules, visible in small telescopes and one of the most prominent such clusters in the northern sky.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Great Hercules Cluster canonical | 3 |
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
deep-sky object
ⓘ
globular star cluster ⓘ |
| age | about 11.7 billion years ⓘ |
| alsoKnownAs |
M 13
ⓘ
surface form:
M13
Messier 13 ⓘ NGC 6205 ⓘ |
| angularDiameter | about 20 arcminutes ⓘ |
| apparentMagnitudeV | 5.8 ⓘ |
| belongsTo |
Milky Way stellar halo
ⓘ
surface form:
Milky Way halo
|
| bestSeenIn | northern hemisphere ⓘ |
| bestViewingSeason |
late spring
ⓘ
summer ⓘ |
| cataloguedBy | Charles Messier ⓘ |
| catalogueEntry |
Messier catalogue
ⓘ
New General Catalogue ⓘ |
| celestialHemisphere | northern sky ⓘ |
| clusterType | Oosterhoff type II (often classified) ⓘ |
| contains |
blue straggler stars
ⓘ
many red giant stars ⓘ variable stars ⓘ |
| coreRadius | about 1.7 parsecs ⓘ |
| declination | +36° 28′ ⓘ |
| discoveredBy |
Edmund Halley
ⓘ
surface form:
Edmond Halley
|
| discoveryYear | 1714 ⓘ |
| distanceFromEarth |
about 22,000 light-years
ⓘ
about 6.8 kiloparsecs ⓘ |
| galacticLatitude | +40.9° ⓘ |
| galacticLongitude | 59.0° ⓘ |
| halfLightRadius | about 3.3 parsecs ⓘ |
| hasSurfaceBrightness | high central surface brightness ⓘ |
| isTargetFor |
amateur astronomers
ⓘ
astrophysical studies of stellar evolution ⓘ |
| locatedIn | Milky Way ⓘ |
| locatedInConstellation | Hercules ⓘ |
| mass | about 600,000 solar masses ⓘ |
| MessierNumber |
M 13
ⓘ
surface form:
M13
|
| metallicity | [Fe/H] ≈ −1.5 ⓘ |
| NGCNumber | NGC 6205 ⓘ |
| notableFeature |
bright, dense core
ⓘ
one of the most prominent globular clusters in the northern sky ⓘ |
| numberOfStars | several hundred thousand ⓘ |
| rightAscension | 16h 41m ⓘ |
| spectralTypeDominant | G and K giants ⓘ |
| visibility |
visible in binoculars under dark skies
ⓘ
visible in small telescopes ⓘ |
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
M13