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.

Try in SPARQL Jump to: Surface forms Statements Referenced by

All labels observed (1)

Label Occurrences
Perseus Arm canonical 13

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 OB2 association
surface form: Perseus OB associations

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
surface form: Milky Way disk

Orion Arm
surface form: Orion–Cygnus region of the Milky Way
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 (13)

Full triples — surface form annotated when it differs from this entity's canonical label.

Milky Way contains Perseus Arm
Double Cluster locatedIn Perseus Arm
Local Arm positionBetween Perseus Arm
Local Spur adjacentTo Perseus Arm
Outer Arm isMoreDistantThan Perseus Arm
Outer Arm isBeyond Perseus Arm
Outer Arm isLessProminentThan Perseus Arm
W3 star-forming region locatedIn Perseus Arm
NGC 7538 locatedIn Perseus Arm
Sagittarius Arm adjacentTo Perseus Arm
IC 1805 (Heart Nebula) locatedIn Perseus Arm
subject surface form: IC 1805
IC 1848 (Soul Nebula) locatedIn Perseus Arm
subject surface form: IC 1848