open cluster NGC 6520 (near its border)
E450602
Open cluster NGC 6520 is a compact, young star cluster in the constellation Sagittarius, seen projected against the rich star fields and dark nebulae near the Milky Way’s central bulge.
All labels observed (1)
| Label | Occurrences |
|---|---|
| open cluster NGC 6520 (near its border) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4531794 — 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: open cluster NGC 6520 (near its border) Context triple: [Corona Australis, contains, open cluster NGC 6520 (near its border)]
-
A.
Open cluster NGC 6530
Open cluster NGC 6530 is a young, bright star cluster embedded in the Lagoon Nebula in the constellation Sagittarius, serving as a prominent site of active star formation within the Milky Way.
-
B.
NGC 6205
NGC 6205 is a bright, densely packed globular star cluster in the constellation Hercules, commonly known as the Great Hercules Cluster (M13).
-
C.
NGC 7320
NGC 7320 is a foreground spiral galaxy in the constellation Pegasus that appears as part of Stephan’s Quintet but is actually much closer to Earth than the other members.
-
D.
NGC 6822
NGC 6822 is a barred irregular dwarf galaxy located in the constellation Sagittarius and is one of the nearest and best-studied galaxies outside the Milky Way.
-
E.
Jewel Box cluster
The Jewel Box cluster is a bright and colorful open star cluster in the constellation Crux, renowned for its striking mix of blue and red stars visible even in small telescopes.
- 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: open cluster NGC 6520 (near its border) Target entity description: Open cluster NGC 6520 is a compact, young star cluster in the constellation Sagittarius, seen projected against the rich star fields and dark nebulae near the Milky Way’s central bulge.
-
A.
Open cluster NGC 6530
Open cluster NGC 6530 is a young, bright star cluster embedded in the Lagoon Nebula in the constellation Sagittarius, serving as a prominent site of active star formation within the Milky Way.
-
B.
NGC 6205
NGC 6205 is a bright, densely packed globular star cluster in the constellation Hercules, commonly known as the Great Hercules Cluster (M13).
-
C.
NGC 7320
NGC 7320 is a foreground spiral galaxy in the constellation Pegasus that appears as part of Stephan’s Quintet but is actually much closer to Earth than the other members.
-
D.
NGC 6822
NGC 6822 is a barred irregular dwarf galaxy located in the constellation Sagittarius and is one of the nearest and best-studied galaxies outside the Milky Way.
-
E.
Jewel Box cluster
The Jewel Box cluster is a bright and colorful open star cluster in the constellation Crux, renowned for its striking mix of blue and red stars visible even in small telescopes.
- F. None of above. chosen
Statements (40)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
open star cluster ⓘ |
| age | young (tens of millions of years, order of magnitude) ⓘ |
| angularSize | ~5 arcminutes ⓘ |
| apparentMagnitudeV | ~7.6 ⓘ |
| associatedWith | Barnard 86 ⓘ |
| bestSeenFrom | southern latitudes ⓘ |
| bestSeenInMonth | July ⓘ |
| bestSeenInSeason | northern summer ⓘ |
| catalog | New General Catalogue ⓘ |
| catalogDesignation | NGC 6520 ⓘ |
| celestialHemisphere | southern celestial hemisphere ⓘ |
| clusterType | compact open cluster ⓘ |
| contains |
blue stars
ⓘ
young stars ⓘ |
| declination | −27° (approximate) ⓘ |
| discoveredBy | John Herschel ⓘ |
| distanceFromEarth |
~1.7 kiloparsecs
ⓘ
~5,500 light-years ⓘ |
| environment |
inner Milky Way
ⓘ
star-forming region ⓘ |
| galacticLatitude | low galactic latitude ⓘ |
| hasProperty |
compact appearance
ⓘ
high stellar density in core ⓘ set against dark nebula background ⓘ |
| locatedIn |
Milky Way
ⓘ
Milky Way disk ⓘ
linked to:
Milky Way
Sagittarius star cloud region ⓘ
linked to:
Sagittarius Star Cloud
|
| locatedInConstellation | Sagittarius ⓘ |
| locatedNear |
Galactic bulge
ⓘ
linked to:
Milky Way center
|
| nearObject | Barnard 86 ⓘ |
| observationalFeature |
contrasts strongly with adjacent dark nebula
ⓘ
rich surrounding star field ⓘ |
| observedIn | optical wavelengths ⓘ |
| projectedAgainst |
dark nebula Barnard 86
ⓘ
rich Milky Way star fields ⓘ |
| rightAscension | 18h 03m (approximate) ⓘ |
| skyPositionRelation | near the Milky Way central bulge in projection ⓘ |
| visibleWith |
binoculars (as a faint patch)
ⓘ
small telescopes ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: open cluster NGC 6520 (near its border) Description of subject: Open cluster NGC 6520 is a compact, young star cluster in the constellation Sagittarius, seen projected against the rich star fields and dark nebulae near the Milky Way’s central bulge.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.