GD-1 stream
E502434
The GD-1 stream is a long, thin tidal stream of stars in the Milky Way’s halo, believed to be the remnant of a disrupted globular cluster and a key probe of the Galaxy’s dark matter distribution.
All labels observed (1)
| Label | Occurrences |
|---|---|
| GD-1 stream canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5202255 — 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: GD-1 stream Context triple: [Milky Way stellar halo, hasSubstructure, GD-1 stream]
-
A.
Arkoudorema stream
Arkoudorema stream is a remote mountain watercourse in northern Greece, known for its pristine habitats and importance to the wildlife of Valia Kalda National Park.
-
B.
Mill Stream
Mill Stream is a scenic waterway running through Willamette University’s campus that serves as a central natural and aesthetic landmark for the university community.
-
C.
Satpara Stream
Satpara Stream is a mountain watercourse in Gilgit-Baltistan, Pakistan, that carries glacial and lake-fed waters from the Skardu region downstream.
-
D.
Yến Stream
Yến Stream is a scenic waterway in northern Vietnam famed for its boat journeys through limestone mountains and caves leading to the Perfume Pagoda.
-
E.
River Ravernet
River Ravernet is a small river in County Down, Northern Ireland, known for flowing through rural landscapes before joining the River Lagan.
- 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: GD-1 stream Target entity description: The GD-1 stream is a long, thin tidal stream of stars in the Milky Way’s halo, believed to be the remnant of a disrupted globular cluster and a key probe of the Galaxy’s dark matter distribution.
-
A.
Arkoudorema stream
Arkoudorema stream is a remote mountain watercourse in northern Greece, known for its pristine habitats and importance to the wildlife of Valia Kalda National Park.
-
B.
Mill Stream
Mill Stream is a scenic waterway running through Willamette University’s campus that serves as a central natural and aesthetic landmark for the university community.
-
C.
Satpara Stream
Satpara Stream is a mountain watercourse in Gilgit-Baltistan, Pakistan, that carries glacial and lake-fed waters from the Skardu region downstream.
-
D.
Yến Stream
Yến Stream is a scenic waterway in northern Vietnam famed for its boat journeys through limestone mountains and caves leading to the Perfume Pagoda.
-
E.
River Ravernet
River Ravernet is a small river in County Down, Northern Ireland, known for flowing through rural landscapes before joining the River Lagan.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical structure
ⓘ
stellar tidal stream ⓘ |
| discoveredBy | Carl J. Grillmair ⓘ |
| discoveredIn | 2006 ⓘ |
| discoveredUsing | Sloan Digital Sky Survey ⓘ |
| hasAge | several billion years ⓘ |
| hasComponent | old stars ⓘ |
| hasDynamics | phase-mixed tidal debris ⓘ |
| hasKinematics | cold stellar stream ⓘ |
| hasLength | over 60 degrees on the sky ⓘ |
| hasMetallicity | metal-poor ⓘ |
| hasOrbitType | highly eccentric orbit ⓘ |
| hasPopulation | halo stars ⓘ |
| hasProgenitorType | globular cluster ⓘ |
| hasReferenceFrame | Galactocentric coordinates ⓘ |
| hasShape | long thin stream ⓘ |
| hasSignificance |
benchmark system for testing dark matter models
ⓘ
key tracer of Galactic halo structure ⓘ |
| hasStellarPopulation | old metal-poor stars ⓘ |
| hasWidth | less than 1 degree on the sky ⓘ |
| isCandidateProbeFor | dark matter subhalos ⓘ |
| isExampleOf | cold thin stellar stream ⓘ |
| isObservedIn | optical wavelengths ⓘ |
| isPerturbedBy |
Galactic bar
ⓘ
linked to:
Milky Way bulge and bar
Milky Way disk ⓘ
linked to:
Galactic disk
|
| isRemnantOf | globular cluster ⓘ |
| isSubjectOf |
dark matter substructure searches
ⓘ
stellar stream dynamical modeling ⓘ |
| isUsedToConstrain |
Milky Way mass distribution
ⓘ
properties of dark matter clumps ⓘ |
| locatedIn |
Milky Way halo
ⓘ
linked to:
Milky Way stellar halo
|
| orbits | Milky Way ⓘ |
| originatesFrom | disrupted globular cluster ⓘ |
| partOf |
Milky Way galaxy
ⓘ
linked to:
Milky Way
|
| showsFeature |
density variations
ⓘ
gaps ⓘ spurs ⓘ |
| studiedWith |
Gaia mission data
ⓘ
Sloan Digital Sky Survey photometry ⓘ |
| traces | Milky Way halo potential ⓘ |
| usedAsProbeFor |
Milky Way dark matter distribution
ⓘ
Milky Way gravitational potential ⓘ |
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: GD-1 stream Description of subject: The GD-1 stream is a long, thin tidal stream of stars in the Milky Way’s halo, believed to be the remnant of a disrupted globular cluster and a key probe of the Galaxy’s dark matter distribution.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.