SagDEG
E117412
SagDEG is a small, elongated dwarf spheroidal galaxy currently being tidally disrupted and absorbed by the Milky Way, located in the direction of the constellation Sagittarius.
All labels observed (1)
| Label | Occurrences |
|---|---|
| SagDEG canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T992625 — 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: SagDEG Context triple: [Sagittarius Dwarf Spheroidal Galaxy, alsoKnownAs, SagDEG]
-
A.
DAG
DAG is the National Rail station code for Dalgety Bay railway station in Fife, Scotland.
-
B.
SACT
SACT is the Supreme Allied Commander Transformation, the NATO strategic commander responsible for leading the alliance’s military transformation and capability development.
-
C.
SSA
SSA is a professional scientific organization dedicated to advancing the study and understanding of earthquakes and seismic phenomena.
-
D.
SSA
SSA is the U.S. federal agency responsible for administering Social Security programs, including retirement, disability, and survivors benefits.
-
E.
SAS
SAS is an elite special forces unit of the British Army renowned for its covert operations, counterterrorism expertise, and rigorous selection process.
- 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: SagDEG Target entity description: SagDEG is a small, elongated dwarf spheroidal galaxy currently being tidally disrupted and absorbed by the Milky Way, located in the direction of the constellation Sagittarius.
-
A.
DAG
DAG is the National Rail station code for Dalgety Bay railway station in Fife, Scotland.
-
B.
SACT
SACT is the Supreme Allied Commander Transformation, the NATO strategic commander responsible for leading the alliance’s military transformation and capability development.
-
C.
SSA
SSA is a professional scientific organization dedicated to advancing the study and understanding of earthquakes and seismic phenomena.
-
D.
SSA
SSA is the U.S. federal agency responsible for administering Social Security programs, including retirement, disability, and survivors benefits.
-
E.
SAS
SAS is an elite special forces unit of the British Army renowned for its covert operations, counterterrorism expertise, and rigorous selection process.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
dwarf spheroidal galaxy
ⓘ
satellite galaxy of the Milky Way ⓘ |
| alternateName |
Sagittarius Dwarf Spheroidal Galaxy
ⓘ
surface form:
Sagittarius Dwarf Elliptical Galaxy
Sagittarius Dwarf Spheroidal Galaxy ⓘ
surface form:
Sagittarius Dwarf Galaxy
Sagittarius Dwarf Spheroidal Galaxy ⓘ |
| contains |
globular cluster Arp 2
ⓘ
Messier 54 ⓘ
surface form:
globular cluster M54
Terzan 7 ⓘ
surface form:
globular cluster Terzan 7
Terzan 8 ⓘ
surface form:
globular cluster Terzan 8
globular cluster Whiting 1 ⓘ |
| discoveredBy |
Geraint F. Lewis
ⓘ
Michael J. Irwin ⓘ Rodrigo Ibata ⓘ |
| discoveryMethod | star count analysis from photographic plates ⓘ |
| discoveryYear | 1994 ⓘ |
| distanceFromEarth_approx | 70000 light-years ⓘ |
| distanceFromGalacticCenter_approx | 16000–20000 parsecs ⓘ |
| hasAbsoluteMagnitude_V_approx | −13 ⓘ |
| hasAngularSize_approx | several tens of degrees along its major axis ⓘ |
| hasCentralObject | massive globular cluster M54 near its center ⓘ |
| hasDarkMatterDominance | true ⓘ |
| hasGasContent | very low ⓘ |
| hasKinematicFeature | stars follow coherent tidal streams ⓘ |
| hasMeanMetallicity_approx | [Fe/H] ≈ −1.0 to −1.5 ⓘ |
| hasMorphologicalType | dSph ⓘ |
| hasOrbitalPeriod_approx | ~0.8–1.0 billion years ⓘ |
| hasScientificSignificance | traces ongoing hierarchical assembly of the Milky Way ⓘ |
| hasShape | elongated ⓘ |
| hasStarFormationActivity | very low ⓘ |
| hasStarFormationHistory | multiple episodes extending to a few Gyr ago ⓘ |
| hasStellarMass_approx | 10^8 solar masses ⓘ |
| hasStellarPopulation |
metal-poor stars
ⓘ
predominantly old stars ⓘ |
| hasStellarStream | Sagittarius Stream ⓘ |
| isBeingAccretedBy | Milky Way ⓘ |
| isBeingTidallyDisruptedBy | Milky Way ⓘ |
| isCurrentlyUndergoing | tidal stripping ⓘ |
| isExampleOf |
galaxy undergoing tidal disruption
ⓘ
minor merger event with the Milky Way ⓘ |
| isNearestKnown | one of the closest satellite galaxies of the Milky Way ⓘ |
| locatedInDirectionOf | constellation Sagittarius ⓘ |
| memberOf | Local Group ⓘ |
| orbitalPlane | nearly polar with respect to Milky Way disk ⓘ |
| orbits | Milky Way ⓘ |
| produces | wrap-around stellar streams around the Milky Way ⓘ |
| usedAsTracerFor |
Galactic potential
ⓘ
Milky Way dark matter halo shape ⓘ |
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: SagDEG Description of subject: SagDEG is a small, elongated dwarf spheroidal galaxy currently being tidally disrupted and absorbed by the Milky Way, located in the direction of the constellation Sagittarius.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.