Orion OB association

E459015

OB association stellar association

The Orion OB association is a nearby stellar grouping dominated by young, massive O- and B-type stars in the Orion constellation, serving as a key region for studying recent star formation in our galactic neighborhood.

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All labels observed (3)

Label	Occurrences
Orion OB1 association	6
Orion OB1b subgroup	2
Orion OB association canonical	1

Statements (49)

Predicate	Object
instanceOf	OB association ⓘ stellar association ⓘ
affects	surrounding molecular clouds ⓘ
age	a few million years ⓘ
ageRange	approximately 1–12 million years ⓘ
associatedWith	Orion A molecular cloud NERFINISHED ⓘ Orion B molecular cloud NERFINISHED ⓘ
contains	T Tauri stars ⓘ pre-main-sequence stars ⓘ young massive stars ⓘ
containsObject	Flame Nebula region NERFINISHED ⓘ Horsehead Nebula region NERFINISHED ⓘ NGC 1977 NERFINISHED ⓘ Orion Nebula (M42) NERFINISHED ⓘ
containsRegion	Orion Belt region NERFINISHED ⓘ Orion Sword region NERFINISHED ⓘ
containsSubgroup	Orion OB1a subgroup NERFINISHED ⓘ Orion OB1b subgroup NERFINISHED ⓘ Orion OB1c subgroup NERFINISHED ⓘ Orion OB1d subgroup NERFINISHED ⓘ
distanceFromEarth	approximately 1100–1500 light-years ⓘ approximately 350–450 parsecs ⓘ
dominantStellarTypes	B-type stars ⓘ O-type stars ⓘ
hasAlternativeName	Orion OB1 association NERFINISHED ⓘ
hasBeenStudiedUsing	X-ray observations ⓘ infrared observations ⓘ optical observations ⓘ radio observations ⓘ
hasKinematicProperty	expanding stellar groups ⓘ
hasStarFormationHistory	sequential star formation ⓘ
importance	prototype OB association in the solar neighborhood ⓘ
influences	interstellar medium in Orion region ⓘ
isNearby	Sun NERFINISHED ⓘ
isPartOf	local spiral arm (Orion Arm) NERFINISHED ⓘ
locatedIn	Milky Way ⓘ
locatedInConstellation	Orion NERFINISHED ⓘ
partOf	Orion molecular cloud complex NERFINISHED ⓘ
radiationField	strong ultraviolet radiation from OB stars ⓘ
roleInAstrophysics	important region for studying massive star formation ⓘ important region for studying triggered star formation ⓘ key laboratory for studying recent star formation ⓘ
skyLocation	near celestial equator ⓘ
stellarPopulation	massive OB stars ⓘ predominantly young stars ⓘ
subdividedInto	Orion OB1 association NERFINISHED ⓘ
usedToStudy	feedback from massive stars on molecular clouds ⓘ initial mass function of young stellar populations ⓘ
visibility	visible from both hemispheres ⓘ

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: Orion OB association
Description of subject: The Orion OB association is a nearby stellar grouping dominated by young, massive O- and B-type stars in the Orion constellation, serving as a key region for studying recent star formation in our galactic neighborhood.