IC 1805 (Heart Nebula)
E122734
IC 1805, commonly known as the Heart Nebula, is a large, bright emission nebula and star-forming region in the constellation Cassiopeia, notable for its heart-shaped appearance in astrophotography.
All labels observed (2)
| Label | Occurrences |
|---|---|
| IC 1805 (Heart Nebula) canonical | 1 |
| IC 1805 H II region | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T934096 — 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: IC 1805 (Heart Nebula) Context triple: [Perseus Arm, contains, IC 1805 (Heart Nebula)]
-
A.
Rosette Nebula
The Rosette Nebula is a large, circular emission nebula and active star-forming region located in the Milky Way, notable for its striking rose-like appearance in astrophotography.
-
B.
Eagle Nebula
The Eagle Nebula is a famous star-forming region in the Milky Way best known for the "Pillars of Creation," towering columns of gas and dust captured in iconic Hubble Space Telescope images.
-
C.
Carina Nebula
The Carina Nebula is a vast, active star-forming region in the Milky Way known for its towering gas and dust pillars and dramatic young stellar clusters.
-
D.
Lagoon Nebula
The Lagoon Nebula is a large, bright emission nebula and active star-forming region located in the constellation Sagittarius, visible even to the naked eye under dark skies.
-
E.
Trifid Nebula
The Trifid Nebula is a bright, star-forming emission and reflection nebula in the constellation Sagittarius, notable for its three-lobed appearance created by dark dust lanes.
- 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: IC 1805 (Heart Nebula) Target entity description: IC 1805, commonly known as the Heart Nebula, is a large, bright emission nebula and star-forming region in the constellation Cassiopeia, notable for its heart-shaped appearance in astrophotography.
-
A.
Rosette Nebula
The Rosette Nebula is a large, circular emission nebula and active star-forming region located in the Milky Way, notable for its striking rose-like appearance in astrophotography.
-
B.
Eagle Nebula
The Eagle Nebula is a famous star-forming region in the Milky Way best known for the "Pillars of Creation," towering columns of gas and dust captured in iconic Hubble Space Telescope images.
-
C.
Carina Nebula
The Carina Nebula is a vast, active star-forming region in the Milky Way known for its towering gas and dust pillars and dramatic young stellar clusters.
-
D.
Lagoon Nebula
The Lagoon Nebula is a large, bright emission nebula and active star-forming region located in the constellation Sagittarius, visible even to the naked eye under dark skies.
-
E.
Trifid Nebula
The Trifid Nebula is a bright, star-forming emission and reflection nebula in the constellation Sagittarius, notable for its three-lobed appearance created by dark dust lanes.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
deep-sky object ⓘ emission nebula ⓘ star-forming region ⓘ |
| alsoKnownAs | Heart Nebula ⓘ |
| angularSize | about 150 arcminutes ⓘ |
| apparentMagnitude | 6.5 ⓘ |
| associatedNebula |
Heart Nebula
ⓘ
surface form:
Soul Nebula
|
| associatedWith |
IC 1795
ⓘ
IC 1848 ⓘ |
| bestSeenInMonth |
December
ⓘ
November ⓘ October ⓘ |
| catalog | Index Catalogue ⓘ |
| catalogCode | IC 1805 ⓘ |
| contains |
dark dust lanes
ⓘ
massive star cluster core ⓘ stellar wind–blown cavities ⓘ young massive stars ⓘ |
| containsOpenCluster | Melotte 15 ⓘ |
| declination | +61° 27′ ⓘ |
| discoveredBy | William Herschel ⓘ |
| discoveryYear | 1787 ⓘ |
| distanceFromEarth |
about 2,300 parsecs
ⓘ
about 7,500 light-years ⓘ |
| dominantEmissionLine | H-alpha ⓘ |
| galacticLatitude | +0.9° ⓘ |
| galacticLongitude | 134° ⓘ |
| gasComposition |
helium
ⓘ
ionized hydrogen ⓘ trace heavier elements ⓘ |
| hasFeature | pillars and globules of gas and dust ⓘ |
| ionizingSource | massive O-type stars in Melotte 15 ⓘ |
| locatedIn |
Milky Way
ⓘ
Perseus Arm ⓘ |
| locatedInConstellation | Cassiopeia ⓘ |
| nebulaType | emission ⓘ |
| observedWith |
binoculars under dark skies
ⓘ
small telescopes ⓘ |
| partOf |
Cassiopeia OB associations
ⓘ
surface form:
Cassiopeia OB association
|
| popularFor | astrophotography ⓘ |
| regionType | massive star-forming complex ⓘ |
| rightAscension | 02h 32m ⓘ |
| shape | heart-shaped ⓘ |
| spectralTypeOfExcitingStars | O-type ⓘ |
| starFormation | ongoing ⓘ |
| visibleIn | northern hemisphere ⓘ |
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: IC 1805 (Heart Nebula) Description of subject: IC 1805, commonly known as the Heart Nebula, is a large, bright emission nebula and star-forming region in the constellation Cassiopeia, notable for its heart-shaped appearance in astrophotography.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
IC 1805 H II region