Perseus Arm
E20156
The Perseus Arm is one of the major spiral arms of the Milky Way galaxy, rich in gas, dust, and star-forming regions.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Perseus Arm canonical | 38 |
How this entity was disambiguated
This entity first appeared as the object of triple T156332 — 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: Perseus Arm Context triple: [Milky Way, contains, Perseus Arm]
-
A.
Orion Arm
The Orion Arm is a minor spiral arm of the Milky Way galaxy that contains our Solar System and many of the stars visible in the night sky.
-
B.
Crescent
Crescent is a long-distance Amtrak passenger train that runs between New York City and New Orleans, serving major cities along the U.S. East Coast and Deep South.
-
C.
Celaeno
Celaeno is one of the Pleiad nymphs in Greek mythology, a daughter of the Titan Atlas and the Oceanid Pleione.
-
D.
Leonidaion
Leonidaion is an ancient guesthouse complex at Olympia in Greece, built in the 4th century BCE to accommodate distinguished visitors during the Olympic Games.
-
E.
Alcyone
Alcyone is one of the Pleiades in Greek mythology, a daughter of the Titan Atlas and often associated with the star cluster of the same name.
- 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: Perseus Arm Target entity description: The Perseus Arm is one of the major spiral arms of the Milky Way galaxy, rich in gas, dust, and star-forming regions.
-
A.
Orion Arm
The Orion Arm is a minor spiral arm of the Milky Way galaxy that contains our Solar System and many of the stars visible in the night sky.
-
B.
Crescent
Crescent is a long-distance Amtrak passenger train that runs between New York City and New Orleans, serving major cities along the U.S. East Coast and Deep South.
-
C.
Celaeno
Celaeno is one of the Pleiad nymphs in Greek mythology, a daughter of the Titan Atlas and the Oceanid Pleione.
-
D.
Leonidaion
Leonidaion is an ancient guesthouse complex at Olympia in Greece, built in the 4th century BCE to accommodate distinguished visitors during the Olympic Games.
-
E.
Alcyone
Alcyone is one of the Pleiades in Greek mythology, a daughter of the Titan Atlas and often associated with the star cluster of the same name.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
spiral arm
ⓘ
structure in the Milky Way ⓘ |
| contains |
Cassiopeia OB associations
ⓘ
H II regions ⓘ IC 1805 (Heart Nebula) ⓘ IC 1848 (Soul Nebula) ⓘ NGC 1499 (California Nebula) ⓘ NGC 281 (Pacman Nebula) ⓘ NGC 7538 ⓘ Perseus OB associations ⓘ
linked to:
Perseus OB2 association
Perseus molecular cloud complex ⓘ W3 star-forming region ⓘ W4 star-forming region ⓘ W5 star-forming region ⓘ embedded star clusters ⓘ giant molecular clouds ⓘ massive young stars ⓘ numerous young stellar objects ⓘ open star clusters ⓘ supernova remnants ⓘ |
| distanceFromSun |
approximately 2 kiloparsecs
ⓘ
approximately 6,500 light-years ⓘ |
| extendsOver | large range of Galactic longitudes ⓘ |
| galacticQuadrants | spans first and second Galactic quadrants ⓘ |
| galaxyTypeContext | barred spiral galaxy ⓘ |
| hasComponent |
cold dense molecular gas
ⓘ
dust lanes ⓘ warm ionized gas ⓘ |
| isOneOf | four major spiral arms of the Milky Way ⓘ |
| liesInside | Outer Arm ⓘ |
| liesOutside | Orion Arm ⓘ |
| locatedIn |
Milky Way disk
ⓘ
linked to:
Milky Way
Orion–Cygnus region of the Milky Way ⓘ
linked to:
Orion Arm
|
| namedAfter | constellation Perseus ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths (in parts) ⓘ radio wavelengths ⓘ |
| orientation | roughly follows Galactic rotation ⓘ |
| partOf | Milky Way ⓘ |
| positionRelativeToGalacticCenter | outer spiral arm ⓘ |
| richIn |
interstellar dust
ⓘ
interstellar gas ⓘ molecular clouds ⓘ star-forming regions ⓘ |
| roleInGalaxy | site of active star formation ⓘ |
| structureType | major spiral arm ⓘ |
| tracedBy |
maser parallax measurements
ⓘ
radio observations of CO emission ⓘ radio observations of neutral hydrogen ⓘ |
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: Perseus Arm Description of subject: The Perseus Arm is one of the major spiral arms of the Milky Way galaxy, rich in gas, dust, and star-forming regions.
Referenced by (38)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
IC 1805 (Heart Nebula)
subject linked to:
IC 1848 (Soul Nebula)
subject linked to:
open cluster IC 1805
subject linked to:
Sharpless 2-190 (for associated nebula)
subject linked to:
open cluster IC 1848