NGC 884
E459044
NGC 884 is a young, bright open star cluster in the constellation Perseus, best known as one half of the famous Double Cluster visible to the naked eye.
All labels observed (1)
| Label | Occurrences |
|---|---|
| NGC 884 canonical | 6 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617675 — 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 884 Context triple: [Double Cluster, hasComponent, NGC 884]
-
A.
NGC 598
NGC 598 is the Triangulum Galaxy, a nearby spiral galaxy in the Local Group and one of the closest large galaxies to 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 7319
NGC 7319 is a barred spiral galaxy in the constellation Pegasus, notable as a member of the interacting galaxy group known as Stephan's Quintet.
-
D.
NGC 2976
NGC 2976 is a nearby dwarf spiral galaxy in the constellation Ursa Major and a member of the M81 Group of galaxies.
-
E.
NGC 7317
NGC 7317 is an elliptical galaxy that forms part of Stephan's Quintet, a famous compact group of interacting galaxies in the constellation Pegasus.
- 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 884 Target entity description: NGC 884 is a young, bright open star cluster in the constellation Perseus, best known as one half of the famous Double Cluster visible to the naked eye.
-
A.
NGC 598
NGC 598 is the Triangulum Galaxy, a nearby spiral galaxy in the Local Group and one of the closest large galaxies to 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 7319
NGC 7319 is a barred spiral galaxy in the constellation Pegasus, notable as a member of the interacting galaxy group known as Stephan's Quintet.
-
D.
NGC 2976
NGC 2976 is a nearby dwarf spiral galaxy in the constellation Ursa Major and a member of the M81 Group of galaxies.
-
E.
NGC 7317
NGC 7317 is an elliptical galaxy that forms part of Stephan's Quintet, a famous compact group of interacting galaxies in the constellation Pegasus.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
open star cluster ⓘ star cluster ⓘ |
| age |
about 12.8 million years
ⓘ
on the order of 10 million years ⓘ |
| alsoKnownAs |
Caldwell 14
ⓘ
h Persei ⓘ |
| angularSize | ~30 arcminutes ⓘ |
| apparentMagnitudeV | 6.1 ⓘ |
| belongsToAsterism |
Double Cluster in Perseus
ⓘ
linked to:
Double Cluster
|
| bestSeenFromHemisphere | Northern Hemisphere ⓘ |
| bestViewingSeason |
northern autumn
ⓘ
northern winter ⓘ |
| catalog | New General Catalogue ⓘ |
| catalogNumber | NGC 884 ⓘ |
| containsStarType |
B-type main-sequence stars
ⓘ
blue supergiants ⓘ variable stars ⓘ |
| declination | +57° 08′ ⓘ |
| discoveredBy | Hipparchus ⓘ |
| distanceFromEarth |
about 2,300 parsecs
ⓘ
about 7,500 light-years ⓘ |
| galacticLatitude | about -4° ⓘ |
| galacticLongitude | about 135° ⓘ |
| hasApproximateStarCount | several hundred stars ⓘ |
| hasColorIndexBminusV | negative (blue-dominated) ⓘ |
| hasNeighboringObject | NGC 869 ⓘ |
| hasNotableFeature |
forms one half of the Double Cluster
ⓘ
high concentration of hot, massive stars ⓘ prominent in wide-field astrophotography of Perseus region ⓘ |
| isGravitationallyBoundTo |
NGC 869 (likely common origin)
ⓘ
linked to:
NGC 869
|
| isRichCluster | true ⓘ |
| isYoungCluster | true ⓘ |
| locatedIn |
Milky Way
ⓘ
Perseus Arm ⓘ |
| locatedInConstellation | Perseus ⓘ |
| observedInWavelength |
infrared
ⓘ
optical ⓘ |
| partOf | Double Cluster ⓘ |
| rightAscension | 02h 22m ⓘ |
| separationFrom | NGC 869 ~30 arcminutes ⓘ |
| skyLocationRelativeTo | near the Perseus–Cassiopeia border ⓘ |
| 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 884 Description of subject: NGC 884 is a young, bright open star cluster in the constellation Perseus, best known as one half of the famous Double Cluster visible to the naked eye.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.