Ophiuchus molecular cloud
E459016
The Ophiuchus molecular cloud is a nearby dense star-forming region rich in gas and dust, notable as one of the closest and most studied nurseries of low-mass stars to Earth.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Ophiuchus molecular cloud canonical | 1 |
| Ophiuchus star-forming region | 1 |
| ρ Ophiuchi cloud core | 1 |
| ρ Ophiuchi molecular cloud complex | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617525 — 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: Ophiuchus molecular cloud Context triple: [Gould Belt, contains, Ophiuchus molecular cloud]
-
A.
Perseus molecular cloud complex
The Perseus molecular cloud complex is a prominent nearby star-forming region rich in cold gas and dust, known for hosting numerous young stellar objects and protostars.
-
B.
Corona Australis molecular cloud complex
The Corona Australis molecular cloud complex is a nearby star-forming region rich in dense gas and dust, known for hosting young stellar objects and reflection nebulae in the constellation Corona Australis.
-
C.
Orion Molecular Cloud Complex
The Orion Molecular Cloud Complex is a vast star-forming region in the constellation Orion, rich in gas, dust, and young stellar objects, and one of the most studied nurseries of massive stars in the Milky Way.
-
D.
Sagittarius Star Cloud
The Sagittarius Star Cloud is a bright, densely populated region of the Milky Way rich in stars and nebulae, prominently visible in the constellation Sagittarius.
-
E.
Monoceros OB2 association
Monoceros OB2 association is a large stellar grouping in the constellation Monoceros, notable for its young, massive stars and active star-forming regions such as the Rosette Nebula.
- 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: Ophiuchus molecular cloud Target entity description: The Ophiuchus molecular cloud is a nearby dense star-forming region rich in gas and dust, notable as one of the closest and most studied nurseries of low-mass stars to Earth.
-
A.
Perseus molecular cloud complex
The Perseus molecular cloud complex is a prominent nearby star-forming region rich in cold gas and dust, known for hosting numerous young stellar objects and protostars.
-
B.
Corona Australis molecular cloud complex
The Corona Australis molecular cloud complex is a nearby star-forming region rich in dense gas and dust, known for hosting young stellar objects and reflection nebulae in the constellation Corona Australis.
-
C.
Taurus molecular cloud complex (projected association)
The Taurus molecular cloud complex (projected association) is a nearby star-forming region in the constellation Taurus, rich in dark molecular clouds and young stellar objects studied as a key site of low-mass star formation.
-
D.
Orion Molecular Cloud Complex
The Orion Molecular Cloud Complex is a vast star-forming region in the constellation Orion, rich in gas, dust, and young stellar objects, and one of the most studied nurseries of massive stars in the Milky Way.
-
E.
Sagittarius Star Cloud
The Sagittarius Star Cloud is a bright, densely populated region of the Milky Way rich in stars and nebulae, prominently visible in the constellation Sagittarius.
- F. None of above. chosen
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf |
dark nebula
ⓘ
giant molecular cloud complex ⓘ molecular cloud ⓘ star-forming region ⓘ |
| containsObject |
Herbig–Haro objects
ⓘ
T Tauri stars ⓘ brown dwarf candidates ⓘ circumstellar disks ⓘ dense molecular cores ⓘ embedded young stellar objects ⓘ pre-main-sequence stars ⓘ protostars ⓘ |
| containsRegion |
Lynds 1688
ⓘ
Lynds 1689 ⓘ Lynds 1709 ⓘ Lynds 1712 ⓘ Lynds 1729 ⓘ Rho Ophiuchi A ⓘ Rho Ophiuchi B ⓘ
linked to:
Rho Ophiuchi A
Rho Ophiuchi C ⓘ
linked to:
Rho Ophiuchi A
Rho Ophiuchi F ⓘ ρ Ophiuchi cloud core ⓘ
linked to:
Ophiuchus molecular cloud
|
| distanceFromEarth |
approximately 120 parsecs
ⓘ
approximately 390 light-years ⓘ |
| dominantStellarPopulation | low-mass stars ⓘ |
| hasAlternativeName |
Ophiuchus star-forming region
ⓘ
linked to:
Ophiuchus molecular cloud
ρ Ophiuchi molecular cloud complex ⓘ
linked to:
Ophiuchus molecular cloud
|
| hasAngularSize | several degrees on the sky ⓘ |
| hasMass | on the order of 10^4 solar masses ⓘ |
| hasStarFormationMode |
clustered star formation
ⓘ
isolated star formation ⓘ |
| knownFor |
being one of the closest star-forming regions to Earth
ⓘ
dense gas and dust content ⓘ nearby low-mass star formation ⓘ |
| locatedInConstellation | Ophiuchus ⓘ |
| observedIn |
infrared wavelengths
ⓘ
millimeter wavelengths ⓘ radio wavelengths ⓘ submillimeter wavelengths ⓘ |
| partOf |
Gould Belt
ⓘ
local star-forming complex near the Sun ⓘ |
| richIn |
carbon monoxide
ⓘ
dust ⓘ molecular hydrogen ⓘ |
| surveyedBy |
2MASS
ⓘ
linked to:
Two Micron All Sky Survey
ALMA ⓘ
linked to:
Atacama Large Millimeter/submillimeter Array
Herschel Space Observatory ⓘ IRAS ⓘ JCMT ⓘ
linked to:
James Clerk Maxwell Telescope
Spitzer Space Telescope ⓘ |
| usedAs |
benchmark region for studies of low-mass star formation
ⓘ
laboratory for studying circumstellar disks ⓘ testbed for protostellar evolution models ⓘ |
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: Ophiuchus molecular cloud Description of subject: The Ophiuchus molecular cloud is a nearby dense star-forming region rich in gas and dust, notable as one of the closest and most studied nurseries of low-mass stars to Earth.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Ophiuchus molecular cloud
linked to: Ophiuchus molecular cloud
linked to: Ophiuchus molecular cloud