open cluster IC 1805
E480048
Open cluster IC 1805 is a young, massive star cluster in the constellation Cassiopeia that illuminates and shapes the surrounding Heart Nebula with its hot, luminous stars.
All labels observed (2)
| Label | Occurrences |
|---|---|
| cluster IC 1805 | 1 |
| open cluster IC 1805 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4922097 — 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 IC 1805 Context triple: [W4 star-forming region, contains, open cluster IC 1805]
-
A.
NGC 185
NGC 185 is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Milky Way and its population of old stars and star clusters.
-
B.
IC 1590
IC 1590 is a young open star cluster embedded within the emission nebula NGC 281 in the constellation Cassiopeia, notable for its role in illuminating and shaping the surrounding gas and dust.
-
C.
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.
-
D.
open star cluster NGC 6611
Open star cluster NGC 6611 is a young, massive cluster of hot, bright stars that illuminates and shapes the surrounding gas and dust of the Eagle Nebula.
-
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 IC 1805 Target entity description: Open cluster IC 1805 is a young, massive star cluster in the constellation Cassiopeia that illuminates and shapes the surrounding Heart Nebula with its hot, luminous stars.
-
A.
NGC 185
NGC 185 is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Milky Way and its population of old stars and star clusters.
-
B.
IC 1590
IC 1590 is a young open star cluster embedded within the emission nebula NGC 281 in the constellation Cassiopeia, notable for its role in illuminating and shaping the surrounding gas and dust.
-
C.
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.
-
D.
open star cluster NGC 6611
Open star cluster NGC 6611 is a young, massive cluster of hot, bright stars that illuminates and shapes the surrounding gas and dust of the Eagle Nebula.
-
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 (52)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
open star cluster ⓘ young massive cluster ⓘ |
| age |
about 1.5 million years
ⓘ
less than 5 million years ⓘ |
| apparentMagnitude | about 6.5 ⓘ |
| associatedWith |
Heart Nebula
NERFINISHED
ⓘ
W4 H II region NERFINISHED ⓘ |
| bestObservedIn | autumn ⓘ |
| bestSeenFrom | Northern Hemisphere NERFINISHED ⓘ |
| catalogCode | IC 1805 NERFINISHED ⓘ |
| cataloguedIn | Index Catalogue NERFINISHED ⓘ |
| constellation | Cassiopeia NERFINISHED ⓘ |
| contains |
B-type stars
ⓘ
Herbig Ae/Be candidates ⓘ OB association members ⓘ T Tauri candidates ⓘ emission-line stars ⓘ massive O-type stars ⓘ pre-main-sequence stars ⓘ |
| declination | +61° 27′ ⓘ |
| discoveredIn | 19th century ⓘ |
| distanceFromEarth |
about 1.9 kiloparsecs
ⓘ
about 6000 light-years ⓘ |
| dominantSpectralTypes |
O-type
ⓘ
early B-type ⓘ |
| drives | stellar winds that carve cavities in the nebula ⓘ |
| embeddedIn | molecular cloud complex W3–W4–W5 NERFINISHED ⓘ |
| hasAngularSize | about 20 arcminutes ⓘ |
| hasCoreRadius | a few arcminutes ⓘ |
| hasInfraredExcessSources | young stellar objects ⓘ |
| hasMassiveMembers |
O4-type stars
NERFINISHED
ⓘ
O5-type stars ⓘ |
| hasStellarPopulation | several thousand stars ⓘ |
| hasXRayEmission | from hot massive stars ⓘ |
| illuminates | Heart Nebula NERFINISHED ⓘ |
| ionizes | surrounding H II region ⓘ |
| isSiteOf | ongoing star formation in surrounding region ⓘ |
| liesNear |
Double Cluster in Perseus
NERFINISHED
ⓘ
IC 1848 NERFINISHED ⓘ |
| locatedIn |
Heart Nebula
NERFINISHED
ⓘ
Milky Way ⓘ Perseus Arm NERFINISHED ⓘ |
| observedIn |
X-ray wavelengths
ⓘ
infrared wavelengths ⓘ optical wavelengths ⓘ |
| otherName |
Collinder 26
NERFINISHED
ⓘ
Melotte 15 NERFINISHED ⓘ OCL 344 ⓘ |
| partOf | Cas OB6 association ⓘ |
| rightAscension | 02h 32m ⓘ |
| shapes | Heart Nebula NERFINISHED ⓘ |
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 IC 1805 Description of subject: Open cluster IC 1805 is a young, massive star cluster in the constellation Cassiopeia that illuminates and shapes the surrounding Heart Nebula with its hot, luminous stars.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
cluster IC 1805