globular star cluster M13
E54486
Globular star cluster M13, also known as the Great Hercules Cluster, is a dense, bright spherical collection of hundreds of thousands of ancient stars located in the constellation Hercules and is one of the most prominent globular clusters visible from Earth.
Observed surface forms (2)
| Surface form | Occurrences |
|---|---|
| M13 | 0 |
| Messier 13 | 1 |
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
NGC object ⓘ deep-sky object ⓘ globular star cluster ⓘ |
| age | about 11.5 billion years ⓘ |
| alsoKnownAs |
Great Hercules Cluster
ⓘ
M 13 ⓘ globular star cluster M13 ⓘ
surface form:
Messier 13
NGC 6205 ⓘ |
| angularSize | about 20 arcminutes ⓘ |
| apparentMagnitudeV | 5.8 ⓘ |
| bestSeenFromLatitude | mid-northern latitudes ⓘ |
| bestSeenIn |
spring
ⓘ
summer ⓘ |
| cataloguedBy | Charles Messier ⓘ |
| catalogueInclusionYear | 1764 ⓘ |
| contains |
RR Lyrae variable stars
ⓘ
blue straggler stars ⓘ horizontal branch stars ⓘ millisecond pulsars ⓘ multiple stellar populations ⓘ red giant stars ⓘ |
| coreRadius | about 1.7 parsecs ⓘ |
| declination | +36° 28′ ⓘ |
| diameter | about 145 light-years ⓘ |
| discoveredBy |
Edmund Halley
ⓘ
surface form:
Edmond Halley
|
| discoveryYear | 1714 ⓘ |
| distanceFromEarth |
about 22,000 light-years
ⓘ
about 6.8 kiloparsecs ⓘ |
| galacticLatitude | about +40° ⓘ |
| galacticLongitude | about 59° ⓘ |
| halfLightRadius | about 3.5 parsecs ⓘ |
| isNakedEyeObject | yes, under dark skies ⓘ |
| isPopularFor |
amateur astronomy observations
ⓘ
astrophotography ⓘ |
| isVisibleFrom | Northern Hemisphere ⓘ |
| locatedIn |
Milky Way stellar halo
ⓘ
surface form:
Galactic halo
Milky Way ⓘ |
| locatedInConstellation | Hercules ⓘ |
| mass | about 600,000 solar masses ⓘ |
| MessierNumber | 13 ⓘ |
| metallicity | [Fe/H] ≈ −1.5 ⓘ |
| NGCNumber | 6205 ⓘ |
| notableEvent | Arecibo message beamed toward M13 in 1974 ⓘ |
| numberOfStars |
on the order of 300,000
ⓘ
several hundred thousand ⓘ |
| observedBy |
Arecibo Observatory
ⓘ
Hubble Space Telescope ⓘ |
| rightAscension | 16h 41m ⓘ |
| ShapleySawyerConcentrationClass | V ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
M13
this entity surface form:
Messier 13