Pacman Nebula
E489843
The Pacman Nebula is a bright emission nebula in the constellation Cassiopeia, notable for its star-forming regions and distinctive shape that resembles the classic video game character Pac-Man.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Pacman Nebula canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T4886114 — 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: Pacman Nebula Context triple: [NGC 281, alsoKnownAs, Pacman Nebula]
-
A.
Ring Nebula
The Ring Nebula is a famous planetary nebula in the constellation Lyra, known for its bright, ring-shaped shell of ionized gas surrounding a hot central white dwarf.
-
B.
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.
-
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.
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.
- 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: Pacman Nebula Target entity description: The Pacman Nebula is a bright emission nebula in the constellation Cassiopeia, notable for its star-forming regions and distinctive shape that resembles the classic video game character Pac-Man.
-
A.
Ring Nebula
The Ring Nebula is a famous planetary nebula in the constellation Lyra, known for its bright, ring-shaped shell of ionized gas surrounding a hot central white dwarf.
-
B.
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.
-
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.
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.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
H II region
ⓘ
astronomical object ⓘ emission nebula ⓘ star-forming region ⓘ |
| alsoKnownAs |
IC 11
ⓘ
NGC 281 ⓘ Sh2-184 ⓘ |
| angularSize | about 35 arcminutes ⓘ |
| apparentMagnitudeV | 7.4 ⓘ |
| bestSeenInMonth | October ⓘ |
| bestSeenInSeason | Northern autumn ⓘ |
| catalog | New General Catalogue ⓘ |
| catalogNumber | NGC 281 ⓘ |
| celestialHemisphere | Northern celestial hemisphere ⓘ |
| contains |
Bok globules
ⓘ
dark dust lanes ⓘ massive OB stars ⓘ molecular clouds ⓘ open cluster IC 1590 ⓘ
linked to:
IC 1590
young stellar objects ⓘ |
| coordinateSystem | equatorial coordinate system ⓘ |
| declination | +56° 37′ ⓘ |
| discoveredBy | Edward Emerson Barnard ⓘ |
| discoveryYear | 1883 ⓘ |
| distanceFromEarth |
approximately 2.8 kiloparsecs
ⓘ
approximately 9,200 light-years ⓘ |
| emits |
hydrogen-alpha radiation
ⓘ
oxygen [O III] emission ⓘ sulfur [S II] emission ⓘ |
| hasFeature |
bright ionization front
ⓘ
embedded young star cluster ⓘ pillars of gas and dust ⓘ |
| imagedBy |
Chandra X-ray Observatory
ⓘ
Hubble Space Telescope ⓘ Spitzer Space Telescope ⓘ |
| ionizedBy | massive stars in IC 1590 ⓘ |
| locatedIn |
Milky Way
ⓘ
Perseus Arm ⓘ |
| locatedInConstellation | Cassiopeia ⓘ |
| namedAfter | Pac-Man video game character ⓘ |
| notableFor |
active star formation
ⓘ
distinctive Pac-Man-like shape ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
| partOf |
Perseus spiral arm star-forming complex
ⓘ
linked to:
Perseus Spiral Arm
|
| rightAscension | 00h 52m ⓘ |
| spectralType | H-alpha emission ⓘ |
| visibleFrom | mid-northern latitudes ⓘ |
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: Pacman Nebula Description of subject: The Pacman Nebula is a bright emission nebula in the constellation Cassiopeia, notable for its star-forming regions and distinctive shape that resembles the classic video game character Pac-Man.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.