Sagittarius Stream
E117415
The Sagittarius Stream is a vast, looping ribbon of stars encircling the Milky Way, created as tidal forces tear apart the infalling Sagittarius Dwarf Spheroidal Galaxy.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Sagittarius Stream canonical | 2 |
| Sagittarius stream | 2 |
| Sagittarius tidal stream | 2 |
| Sagittarius stellar stream | 1 |
| Sgr stream | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T992639 — 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: Sagittarius Stream Context triple: [Sagittarius Dwarf Spheroidal Galaxy, forms, Sagittarius Stream]
-
A.
Magellanic Stream
The Magellanic Stream is a vast, trailing ribbon of gas stretching across the sky, stripped from the Magellanic Clouds as they interact gravitationally with the Milky Way.
-
B.
Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy is a small, elongated satellite galaxy currently being tidally disrupted and absorbed by the Milky Way.
-
C.
Sagittarius Arm
The Sagittarius Arm is one of the main spiral arms of the Milky Way galaxy, rich in star-forming regions and nebulae, located between the galactic center and the outer Perseus Arm.
-
D.
Gould Belt
The Gould Belt is a nearby, partial ring of young stars, gas, and star-forming regions tilted to the Milky Way’s plane and encompassing many of the bright constellations visible from Earth.
-
E.
Milky Way subgroup
The Milky Way subgroup is the collection of nearby galaxies gravitationally bound to and dominated by the Milky Way within the larger Local Group.
- 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: Sagittarius Stream Target entity description: The Sagittarius Stream is a vast, looping ribbon of stars encircling the Milky Way, created as tidal forces tear apart the infalling Sagittarius Dwarf Spheroidal Galaxy.
-
A.
Magellanic Stream
The Magellanic Stream is a vast, trailing ribbon of gas stretching across the sky, stripped from the Magellanic Clouds as they interact gravitationally with the Milky Way.
-
B.
Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy is a small, elongated satellite galaxy currently being tidally disrupted and absorbed by the Milky Way.
-
C.
Sagittarius Arm
The Sagittarius Arm is one of the main spiral arms of the Milky Way galaxy, rich in star-forming regions and nebulae, located between the galactic center and the outer Perseus Arm.
-
D.
Gould Belt
The Gould Belt is a nearby, partial ring of young stars, gas, and star-forming regions tilted to the Milky Way’s plane and encompassing many of the bright constellations visible from Earth.
-
E.
Milky Way subgroup
The Milky Way subgroup is the collection of nearby galaxies gravitationally bound to and dominated by the Milky Way within the larger Local Group.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical structure
ⓘ
stellar stream ⓘ tidal stream ⓘ |
| ageOfDisruption | several billion years ⓘ |
| alsoKnownAs |
Sagittarius tidal stream
ⓘ
linked to:
Sagittarius Stream
Sgr stream ⓘ
linked to:
Sagittarius Stream
|
| associatedWith |
Sagittarius Dwarf Spheroidal Galaxy core
ⓘ
linked to:
Sagittarius Dwarf Spheroidal Galaxy
globular cluster Arp 2 ⓘ globular cluster M54 ⓘ
linked to:
Messier 54
globular cluster Terzan 7 ⓘ
linked to:
Terzan 7
globular cluster Terzan 8 ⓘ
linked to:
Terzan 8
|
| composedOf |
dark matter
ⓘ
globular clusters ⓘ stars ⓘ |
| contains |
bifurcated branches
ⓘ
leading arm ⓘ trailing arm ⓘ |
| discoveredBy |
Gerry Gilmore
ⓘ
Mike Irwin ⓘ Rodrigo Ibata ⓘ |
| discoveredUsing |
Anglo-Australian Telescope
ⓘ
UK Schmidt Telescope ⓘ |
| discoveryYear | 1994 ⓘ |
| distanceFromGalacticCenter | approximately 15–60 kiloparsecs ⓘ |
| distanceFromSun | approximately 20–60 kiloparsecs ⓘ |
| encircles | Milky Way ⓘ |
| extendsOver |
both Galactic hemispheres
ⓘ
more than 360 degrees on the sky ⓘ |
| hasProgenitor | Sagittarius Dwarf Spheroidal Galaxy ⓘ |
| hostGalaxy | Milky Way ⓘ |
| isExampleOf | ongoing minor merger with the Milky Way ⓘ |
| isResultOf |
galactic cannibalism
ⓘ
tidal disruption ⓘ |
| kinematics | coherent velocity pattern along orbit ⓘ |
| locatedIn |
Milky Way halo
ⓘ
linked to:
Milky Way stellar halo
|
| mappedBy |
2MASS survey
ⓘ
linked to:
Two Micron All Sky Survey
Gaia mission ⓘ
linked to:
Gaia observatory
Sloan Digital Sky Survey ⓘ |
| observedIn |
infrared wavelengths
ⓘ
near-ultraviolet wavelengths ⓘ optical wavelengths ⓘ |
| orbitalInclination | nearly polar to Galactic disk ⓘ |
| orbitalShape | polar orbit ⓘ |
| originatesFrom | Sagittarius Dwarf Spheroidal Galaxy ⓘ |
| stellarPopulation |
metal-poor stars
ⓘ
old stars ⓘ |
| traces | Milky Way gravitational potential ⓘ |
| usedFor |
constraining Milky Way dark matter halo shape
ⓘ
studying galaxy formation ⓘ testing models of hierarchical merging ⓘ |
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: Sagittarius Stream Description of subject: The Sagittarius Stream is a vast, looping ribbon of stars encircling the Milky Way, created as tidal forces tear apart the infalling Sagittarius Dwarf Spheroidal Galaxy.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Sagittarius Stream
linked to: Sagittarius Stream
linked to: Sagittarius Stream
linked to: Sagittarius Stream
linked to: Sagittarius Stream
linked to: Sagittarius Stream