Heart Nebula
E494853
The Heart Nebula is a vast emission nebula in the constellation Cassiopeia, known for its heart-like shape and active star-forming regions.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Heart Nebula canonical | 12 |
| Heart and Soul Nebula complex | 3 |
| Soul Nebula | 3 |
| Heart Nebula complex | 1 |
| Heart Nebula star-forming region | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4922094 — 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: Heart Nebula Context triple: [W4 star-forming region, associatedWith, Heart Nebula]
-
A.
Swan Nebula
The Swan Nebula, also known as M17 or the Omega Nebula, is a bright star-forming emission nebula in the constellation Sagittarius, rich in gas, dust, and young massive stars.
-
B.
Omega Nebula
The Omega Nebula is a bright, star-forming emission nebula and H II region located in the constellation Sagittarius, known for its distinctive swan-like shape and rich young star clusters.
-
C.
Tarantula Nebula
The Tarantula Nebula is an enormous, extremely active star-forming region in the Large Magellanic Cloud and one of the most luminous nebulae known in the Local Group of galaxies.
-
D.
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.
-
E.
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.
- 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: Heart Nebula Target entity description: The Heart Nebula is a vast emission nebula in the constellation Cassiopeia, known for its heart-like shape and active star-forming regions.
-
A.
Swan Nebula
The Swan Nebula, also known as M17 or the Omega Nebula, is a bright star-forming emission nebula in the constellation Sagittarius, rich in gas, dust, and young massive stars.
-
B.
Omega Nebula
The Omega Nebula is a bright, star-forming emission nebula and H II region located in the constellation Sagittarius, known for its distinctive swan-like shape and rich young star clusters.
-
C.
Tarantula Nebula
The Tarantula Nebula is an enormous, extremely active star-forming region in the Large Magellanic Cloud and one of the most luminous nebulae known in the Local Group of galaxies.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
emission nebula ⓘ |
| alsoKnownAs |
IC 1805
ⓘ
Sharpless 2-190 ⓘ |
| angularSize | about 150 arcminutes ⓘ |
| apparentMagnitudeV | about 6.5 ⓘ |
| associatedWith |
W4 H II region
ⓘ
linked to:
W4 star-forming region
|
| bestSeenFrom | dark skies ⓘ |
| bestSeenIn | autumn in the Northern Hemisphere ⓘ |
| catalog | IC ⓘ |
| catalogNumber | IC 1805 ⓘ |
| celestialHemisphere | Northern sky ⓘ |
| color | reddish ⓘ |
| contains |
dark dust lanes
ⓘ
ionized hydrogen gas ⓘ massive young stellar objects ⓘ open cluster Melotte 15 ⓘ
linked to:
Melotte 15
pillars of gas and dust ⓘ stellar winds carved cavities ⓘ young massive stars ⓘ |
| declination | +61° 27′ ⓘ |
| discovery | discovered in the 19th century ⓘ |
| distanceFromEarth |
about 2,300 parsecs
ⓘ
about 7,500 light-years ⓘ |
| dominantEmissionLine | H-alpha ⓘ |
| gasComposition |
helium
ⓘ
primarily hydrogen ⓘ trace heavier elements ⓘ |
| hasMorphology |
bright rims around cavities
ⓘ
filamentary structures ⓘ |
| hasStarFormation | ongoing ⓘ |
| ionizationSource |
hot B-type stars
ⓘ
hot O-type stars ⓘ |
| isTargetFor |
amateur astronomers
ⓘ
professional astronomers ⓘ |
| locatedIn |
Milky Way
ⓘ
Perseus Arm ⓘ |
| locatedInConstellation | Cassiopeia ⓘ |
| near | Soul Nebula ⓘ |
| observedWith |
astrophotography equipment
ⓘ
wide-field telescopes ⓘ |
| partOf |
Cassiopeia OB association
ⓘ
linked to:
Cassiopeia OB associations
|
| regionType | massive star-forming complex ⓘ |
| requires | narrowband filters for detailed imaging ⓘ |
| rightAscension | 02h 32m ⓘ |
| shape | heart-shaped ⓘ |
| sharplessNumber |
Sh2-190
ⓘ
linked to:
Sharpless 2-190
|
| visibleWith | small telescopes under dark skies ⓘ |
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: Heart Nebula Description of subject: The Heart Nebula is a vast emission nebula in the constellation Cassiopeia, known for its heart-like shape and active star-forming regions.
Referenced by (20)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Heart Nebula
subject linked to:
IC 1805 (Heart Nebula)
subject linked to:
IC 1805 (Heart Nebula)
linked to: Heart Nebula
subject linked to:
IC 1848 (Soul Nebula)
linked to: Heart Nebula
subject linked to:
IC 1848 (Soul Nebula)
subject linked to:
IC 1848 (Soul Nebula)
linked to: Heart Nebula
subject linked to:
open cluster IC 1805
subject linked to:
open cluster IC 1805
subject linked to:
open cluster IC 1805
subject linked to:
open cluster IC 1805
subject linked to:
Sharpless 2-190 (for associated nebula)
linked to: Heart Nebula
subject linked to:
open cluster IC 1848
subject linked to:
open cluster IC 1848
linked to: Heart Nebula
linked to: Heart Nebula