NGC 869
E460835
NGC 869 is a young, massive open star cluster in the constellation Perseus, best known as one half of the prominent Double Cluster visible to the naked eye.
All labels observed (1)
| Label | Occurrences |
|---|---|
| NGC 869 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617674 — 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: NGC 869 Context triple: [Double Cluster, hasComponent, NGC 869]
-
A.
NGC 346
NGC 346 is a prominent star-forming region and open cluster in the Small Magellanic Cloud, known for its young, massive stars and complex nebular structures.
-
B.
Messier 45
Messier 45, commonly known as the Pleiades, is a prominent open star cluster in the constellation Taurus, easily visible to the naked eye and famous in many cultures worldwide.
-
C.
NGC 1977
NGC 1977 is a bright reflection nebula and star-forming region located in the constellation Orion, often seen near the famous Orion Nebula as part of the same larger complex.
-
D.
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.
-
E.
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.
- 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: NGC 869 Target entity description: NGC 869 is a young, massive open star cluster in the constellation Perseus, best known as one half of the prominent Double Cluster visible to the naked eye.
-
A.
NGC 346
NGC 346 is a prominent star-forming region and open cluster in the Small Magellanic Cloud, known for its young, massive stars and complex nebular structures.
-
B.
Messier 45
Messier 45, commonly known as the Pleiades, is a prominent open star cluster in the constellation Taurus, easily visible to the naked eye and famous in many cultures worldwide.
-
C.
NGC 1977
NGC 1977 is a bright reflection nebula and star-forming region located in the constellation Orion, often seen near the famous Orion Nebula as part of the same larger complex.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
open star cluster ⓘ star cluster ⓘ |
| age |
about 13 million years
ⓘ
young ⓘ |
| angularSize | 30 arcminutes ⓘ |
| apparentBrightness | prominent ⓘ |
| apparentMagnitudeV | 5.3 ⓘ |
| appearsIn | Perseus OB association region NERFINISHED ⓘ |
| bestSeenFrom | Northern Hemisphere NERFINISHED ⓘ |
| bestSeenInMonth | November ⓘ |
| CaldwellNumber | C14 ⓘ |
| catalog |
Caldwell catalog
NERFINISHED
ⓘ
NGC NERFINISHED ⓘ |
| clusterType | rich ⓘ |
| constellation | Perseus NERFINISHED ⓘ |
| contains |
B-type stars
ⓘ
blue giants ⓘ main-sequence stars ⓘ massive stars ⓘ |
| coreRadius | a few arcminutes ⓘ |
| declination | +57° 09′ ⓘ |
| discoveredBy | Hipparchus NERFINISHED ⓘ |
| distanceFromEarth |
about 2,300 parsecs
ⓘ
about 7,500 light-years ⓘ |
| galacticLatitude | about +4° ⓘ |
| galacticLongitude | about 135° ⓘ |
| hasAlternativeName |
Double Cluster in Perseus (component)
NERFINISHED
ⓘ
h Persei NERFINISHED ⓘ |
| locatedIn |
Milky Way
ⓘ
Perseus Arm NERFINISHED ⓘ |
| mass | several thousand solar masses ⓘ |
| metallicity | near-solar ⓘ |
| numberOfStars | several hundred visible members ⓘ |
| observedSince | antiquity ⓘ |
| observedWith |
binoculars
ⓘ
small telescopes ⓘ |
| pairedWith | NGC 884 NERFINISHED ⓘ |
| partOf | Double Cluster NERFINISHED ⓘ |
| rightAscension | 02h 19m ⓘ |
| stellarPopulation | Population I ⓘ |
| usedFor |
studies of open cluster dynamics
ⓘ
studies of stellar evolution ⓘ |
| visibleToNakedEye | true ⓘ |
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: NGC 869 Description of subject: NGC 869 is a young, massive open star cluster in the constellation Perseus, best known as one half of the prominent Double Cluster visible to the naked eye.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.