globular star cluster M13

E54486

Messier object NGC object deep-sky object globular star cluster

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.

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All labels observed (4)

Label	Occurrences
Messier 13	3
NGC 6205 is the globular cluster M13	1
globular cluster M13	1
globular star cluster M13 canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T432768 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: globular star cluster M13
Context triple: [Arecibo message, target, globular star cluster M13]

A. Triangulum Galaxy
The Triangulum Galaxy is a nearby spiral galaxy in the Local Group, notable as one of the closest large galaxies to the Milky Way and a companion to the Andromeda Galaxy.
B. Canis Major Dwarf Galaxy
The Canis Major Dwarf Galaxy is a nearby, faint irregular dwarf galaxy thought to be the closest known satellite galaxy to the Milky Way and currently being tidally disrupted by it.
C. Milky Way center
The Milky Way center is the dense, energetic core of our galaxy, hosting a supermassive black hole surrounded by stars, gas, and dust.
D. Pleiades
The Pleiades are a famous open star cluster in the constellation Taurus, often known as the Seven Sisters in Greek mythology.
E. Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy is a small, elongated satellite galaxy currently being tidally disrupted and absorbed by the Milky Way.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: globular star cluster M13
Target entity description: 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.

A. Triangulum Galaxy
The Triangulum Galaxy is a nearby spiral galaxy in the Local Group, notable as one of the closest large galaxies to the Milky Way and a companion to the Andromeda Galaxy.
B. Canis Major Dwarf Galaxy
The Canis Major Dwarf Galaxy is a nearby, faint irregular dwarf galaxy thought to be the closest known satellite galaxy to the Milky Way and currently being tidally disrupted by it.
C. Milky Way center
The Milky Way center is the dense, energetic core of our galaxy, hosting a supermassive black hole surrounded by stars, gas, and dust.
D. Pleiades
The Pleiades are a famous open star cluster in the constellation Taurus, often known as the Seven Sisters in Greek mythology.
E. Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy is a small, elongated satellite galaxy currently being tidally disrupted and absorbed by the Milky Way.
F. None of above. chosen

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 ⓘ Messier 13 ⓘ linked to: globular star cluster M13 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	Edmond Halley ⓘ linked to: Edmund 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	Galactic halo ⓘ linked to: Milky Way stellar 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 ⓘ

How these facts were elicited

Referenced by (6)

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

Arecibo message → target → globular star cluster M13 ⓘ

M13 → alsoKnownAs → Messier 13 ⓘ

subject linked to: globular star cluster M13