NGC 2359
E509403
NGC 2359, also known as Thor's Helmet, is an emission nebula with a distinctive helmet-like shape located in the constellation Canis Major.
All labels observed (3)
| Label | Occurrences |
|---|---|
| NGC 2359 canonical | 3 |
| HD 56925 (central star of NGC 2359) | 1 |
| emission nebula NGC 2359 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5259957 — 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 2359 Context triple: [Canis Major, contains, NGC 2359]
-
A.
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.
-
B.
NGC 2023
NGC 2023 is a bright reflection nebula in the constellation Orion, illuminated by a young B-type star and noted for its complex dust and gas structures.
-
C.
NGC 2024
NGC 2024, also known as the Flame Nebula, is a bright emission nebula and active star-forming region located in the constellation Orion near the Horsehead Nebula.
-
D.
NGC 3132
NGC 3132 is a bright, elliptical planetary nebula in the constellation Vela, noted for its striking ring-like appearance and complex internal structure.
-
E.
NGC 2071
NGC 2071 is a reflection nebula and active star-forming region located in the constellation Orion, associated with the larger Orion B molecular cloud.
- 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 2359 Target entity description: NGC 2359, also known as Thor's Helmet, is an emission nebula with a distinctive helmet-like shape located in the constellation Canis Major.
-
A.
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.
-
B.
NGC 2023
NGC 2023 is a bright reflection nebula in the constellation Orion, illuminated by a young B-type star and noted for its complex dust and gas structures.
-
C.
NGC 2024
NGC 2024, also known as the Flame Nebula, is a bright emission nebula and active star-forming region located in the constellation Orion near the Horsehead Nebula.
-
D.
NGC 3132
NGC 3132 is a bright, elliptical planetary nebula in the constellation Vela, noted for its striking ring-like appearance and complex internal structure.
-
E.
NGC 2071
NGC 2071 is a reflection nebula and active star-forming region located in the constellation Orion, associated with the larger Orion B molecular cloud.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
deep-sky object
ⓘ
emission nebula ⓘ nebula ⓘ |
| alsoKnownAs |
Gum 4
ⓘ
linked to:
GumNebula
Sh 2-298 ⓘ Sharpless 2-298 ⓘ Thor's Helmet ⓘ
linked to:
Thor’s Helmet Nebula
Thor’s Helmet Nebula ⓘ |
| apparentMagnitudeV | approximately 11.5 ⓘ |
| bestSeenInMonths | winter (Northern Hemisphere) ⓘ |
| catalog |
Gum
ⓘ
NGC ⓘ Sharpless ⓘ |
| centralStar |
HD 56925
ⓘ
WR 7 ⓘ |
| discoveredBy | William Herschel ⓘ |
| discoveryDate | 1785 ⓘ |
| distanceFromEarth |
approximately 11,000 light-years
ⓘ
approximately 3,400 parsecs ⓘ |
| excitedBy | Wolf–Rayet star ⓘ |
| hasAngularSize | approximately 8 arcminutes ⓘ |
| hasColor | bluish-green in narrowband images ⓘ |
| hasDeclination | −13° 13′ ⓘ |
| hasEmissionLines |
hydrogen
ⓘ
oxygen ⓘ sulfur ⓘ |
| hasEmissionType | H II region ⓘ |
| hasIonizationSource | ultraviolet radiation from WR 7 ⓘ |
| hasMorphology |
bubble-like structure
ⓘ
helmet-like shape ⓘ |
| hasRightAscension | 07h 18m ⓘ |
| hasSpectralTypeOfCentralStar | WN4 ⓘ |
| hasStructure |
filamentary arcs
ⓘ
multiple shells ⓘ |
| isAssociatedWith |
massive star evolution
ⓘ
strong stellar winds ⓘ |
| isInHemisphere | southern celestial hemisphere ⓘ |
| isObservedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
| isPartOf |
New General Catalogue of Nebulae and Clusters of Stars
ⓘ
linked to:
New General Catalogue
|
| isPopularFor | astrophotography ⓘ |
| isTypeOfNebula | wind-blown bubble ⓘ |
| locatedIn |
Milky Way
ⓘ
Orion Arm ⓘ |
| locatedInConstellation | Canis Major ⓘ |
| nearbyBrightStar |
Sirius (in same constellation)
ⓘ
linked to:
Sirius
|
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 2359 Description of subject: NGC 2359, also known as Thor's Helmet, is an emission nebula with a distinctive helmet-like shape located in the constellation Canis Major.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.