Perseus Arm

E20156

spiral arm structure in the Milky Way

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 ⓘ

Cassiopeia OB associations → 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